Patent Publication Number: US-2023145963-A1

Title: Combustion-Gas Supply System and Method Thereof, Device Equipped with Turbine Engine, and Fracturing System

Description:
CROSS REFERENCES TO RELATED APPLICATIONS 
     The present application is based on and claims priority to Chinese Patent Application No. 202111317278.8 filed with CNIPA on Nov. 9, 2021, and Chinese Patent Application No. 202122726296.3 filed with CNIPA on Nov. 9, 2021, the present disclosures of which are incorporated herein by reference in their entireties as part of the present disclosure. 
     TECHNICAL FIELD 
     Embodiments of the present disclosure relate to a combustion-gas supply system, a combustion-gas supply method, a device equipped with a turbine engine, and a fracturing system. 
     BACKGROUND 
     In the field of oil and gas extraction, fracturing technology refers to a technology that uses hydraulic action to form fractures in oil and gas layers in a process of oil production or gas production. Fractures are formed in oil and gas layers through the fracturing technology, so that a flow environment of oil or gas under the ground can be improved, and production of oil wells can be increased. 
     On the other hand, a turbine engine has advantages of small size, light weight, high power and good fuel economy, which is widely used in fracturing devices and power generation devices. The turbine engine has good fuel compatibility, and diesel, liquefied natural gas (LNG), compressed natural gas (CNG), and even biofuels can be used as fuel for turbine engines. 
     SUMMARY 
     Embodiments of the present disclosure relate to a combustion-gas supply system, a combustion-gas supply method, a device equipped with a turbine engine, and a fracturing system. The combustion-gas supply system can introduce high-pressure gas (for example, high pressure air) into the first sub-pipeline from the first gas outlet pipe through the multi-functional pipeline, to discharge residual combustion-gas in the first sub-pipeline, so as to improve the safety of the combustion-gas supply system and reduce the on-site operation difficulty and cost; on the other hand, the combustion-gas supply system can also conduct pressure test on the main pipeline before operation through the multi-functional pipeline to eliminate potential safety hazards, such as leakage of the main pipeline, in advance. The combustion-gas supply system can also supply combustion-gas through a multi-functional pipeline in a case that the gas in the main pipeline is insufficient, so as to ensure the stable and continuous operation of the whole combustion-gas supply system. 
     At least one embodiment of the present disclosure provides a combustion-gas supply system, which includes: a main pipeline, including a first sub-pipeline and a second sub-pipeline connected with the first sub-pipeline; and a multi-functional pipeline, the first sub-pipeline includes a first gas intake pipe, a first gas supply valve and a first gas outlet pipe arranged in sequence, the first gas intake pipe is configured to input combustion-gas; the second sub-pipeline includes a combustion-gas supply valve and a gas supply pipe, the first gas outlet pipe is connected with the combustion-gas supply valve, the gas supply pipe is configured to be connected with a turbine engine, the multi-functional pipeline includes a second gas intake pipe, a second gas supply valve and a second gas outlet pipe arranged in sequence, and the second gas outlet pipe is communicated with the first gas outlet pipe. 
     For example, in the combustion-gas supply system provided by an embodiment of the present disclosure, the first sub-pipeline further includes: a combustion-gas pressure regulating valve, located between the first gas supply valve and the first gas outlet pipe; and a bypass one-way valve, an input end of the bypass one-way valve is communicated with the first gas outlet pipe, an output end of the bypass one-way valve is located between the combustion-gas pressure regulating valve and the first gas supply valve, the bypass one-way valve is able to be flowed through in a direction from the input end to the output end, and is not able to be flowed through in a direction from the output end to the input end. 
     For example, in the combustion-gas supply system provided by an embodiment of the present disclosure, the first sub-pipeline further includes: at least one gas filter, located between the first gas supply valve and the combustion-gas pressure regulating valve; and a gas source pressure gauge, located between the first gas supply valve and the gas filter, or located between the first gas intake pipe and the first gas supply valve, the output end of the bypass one-way valve is located between the gas filter and the combustion-gas pressure regulating valve. 
     For example, in the combustion-gas supply system provided by an embodiment of the present disclosure, the first sub-pipeline further includes a first pressure sensor, the first pressure sensor is located between the first gas supply valve and the gas filter, and the first pressure sensor is configured to monitor gas supply pressure in real time. 
     For example, the combustion-gas supply system provided by an embodiment of the present disclosure further includes: a blowdown valve, located between the first gas supply valve and the combustion-gas pressure regulating valve, a height of the blowdown valve is less than a height of the main pipeline. 
     For example, in the combustion-gas supply system provided by an embodiment of the present disclosure, the first sub-pipeline further includes: a gas temperature sensor, located on the first gas outlet pipe and configured to detect temperature of combustion-gas in the first gas outlet pipe; and a second pressure sensor, located on the first gas outlet pipe and configured to detect pressure of the combustion-gas in the first gas outlet pipe. 
     For example, the combustion-gas supply system provided by an embodiment of the present disclosure further includes: a first gas supply interface, including a first gas delivery pipe, the first gas delivery pipe is communicated with the first gas intake pipe; a second gas supply interface, including a second gas delivery pipe, the second gas delivery pipe is communicated with the first gas intake pipe; and a third gas supply interface, including a third gas delivery pipe, the third gas delivery pipe is communicated with the first gas intake pipe, both a pipe diameter of the second gas delivery pipe and a pipe diameter of the third gas delivery pipe are larger than a pipe diameter of the first gas delivery pipe, and both the pipe diameter of the second gas delivery pipe and the pipe diameter of the third gas delivery pipe are larger than a pipe diameter of the first gas intake pipe. 
     For example, in the combustion-gas supply system provided by an embodiment of the present disclosure, both the pipe diameter of the second gas delivery pipe and the pipe diameter of the third gas delivery pipe are greater than or equal to two times of the pipe diameter of the first gas delivery pipe. 
     For example, in the combustion-gas supply system provided by an embodiment of the present disclosure, the second sub-pipeline further includes: a flow control valve, located between the combustion-gas supply valve and the gas supply pipe; and a gas one-way valve, an input end of the gas one-way valve is connected with the flow control valve, and an output end of the gas one-way valve is communicated with the gas supply pipe. 
     For example, in the combustion-gas supply system provided by an embodiment of the present disclosure, the second sub-pipeline further includes: a gas exhaust valve, located between the combustion-gas supply valve and the gas one-way valve. 
     At least one embodiment of the present disclosure further provides a device equipped with a turbine engine, which includes: a turbine engine; and the abovementioned combustion-gas supply system, the turbine engine includes a fuel nozzle, and the gas supply pipe is configured to provide combustion-gas to the fuel nozzle. 
     At least one embodiment of the present disclosure further provides a combustion-gas supply method of the combustion-gas supply system, which includes: before supplying combustion-gas, turning on the second gas supply valve, and introducing first high-pressure gas into the first sub-pipeline through the multi-functional pipeline, to test pressure of the first sub-pipeline; and after operation is completed, turning on the second gas supply valve, and introducing second high-pressure gas into the first sub-pipeline through the multi-functional pipeline, to discharge residual combustion-gas in the first sub-pipeline from the first gas intake pipe. 
     For example, the combustion-gas supply method of the combustion-gas supply system provided by an embodiment of the present disclosure further including: during operation, in a case where pressure of combustion-gas in the first gas outlet pipe is less than a preset value, turning on the second gas supply valve, and introducing combustion-gas into the first gas outlet pipe through the multi-functional pipeline. 
     For example, in the combustion-gas supply method of the combustion-gas supply system provided by an embodiment of the present disclosure, a plurality of the combustion-gas supply systems are arranged, each of the combustion-gas supply systems further includes: a first gas supply interface including a first gas delivery pipe, and the first gas delivery pipe is communicated with the first gas intake pipe; a second gas supply interface including a second gas delivery pipe, and the second gas delivery pipe is communicated with the first gas intake pipe; and a third gas supply interface including a third gas delivery pipe, and the third gas delivery pipe is communicated with the first gas intake pipe, both a pipe diameter of the second gas delivery pipe and a pipe diameter of the third gas delivery pipe are larger than a pipe diameter of the first gas delivery pipe, and both a pipe diameter of the second gas delivery pipe and a pipe diameter of the third gas delivery pipe are larger than a pipe diameter of the first gas intake pipe, and the combustion-gas supply method further includes: connecting the third gas supply interface in one of two adjacent ones of the combustion-gas supply systems with the second gas supply interface in the other one of the two adjacent ones of the combustion-gas supply systems, to connect the plurality of the combustion-gas supply systems in series. 
     At least one embodiment of the present disclosure further provides a fracturing system, which includes: a first fracturing device group, including N turbine fracturing devices; a second fracturing device group, including M turbine fracturing devices; a combustion-gas pipeline, the combustion-gas pipeline is respectively connected with the first fracturing device group and the second fracturing device group, and is configured to provide combustion-gas to N+M turbine fracturing devices; a compressed air pipeline, the compressed air pipeline is respectively connected with the first fracturing device group and the second fracturing device group, and is configured to provide compressed air to the N+M turbine fracturing devices; and an auxiliary-energy pipeline, each of the turbine fracturing devices includes a turbine engine and an auxiliary device, and the auxiliary-energy pipeline is respectively connected with the first fracturing device group and the second fracturing device group, and is configured to provide auxiliary-energy to auxiliary devices of the N+M turbine fracturing devices, N and M are positive integers greater than or equal to 2, respectively, each of the turbine fracturing devices includes a turbine engine and the combustion-gas supply system, the combustion-gas supply system is connected with the combustion-gas pipeline, and is configured to provide combustion-gas to the turbine engine. 
     For example, in the fracturing system provided by an embodiment of the present disclosure, the auxiliary device includes a diesel engine, the auxiliary-energy pipeline is configured to deliver diesel fuel; or, the auxiliary device includes an electric motor, and the auxiliary-energy pipeline is configured to deliver electrical power. 
     For example, in the fracturing system provided by an embodiment of the present disclosure, the combustion-gas pipeline includes a main combustion-gas pipeline and a plurality of combustion-gas branch pipelines connected with the main combustion-gas pipeline, the auxiliary-energy pipeline includes an auxiliary-energy main pipeline and a plurality of auxiliary-energy branch pipelines connected with the auxiliary-energy main pipeline, the compressed air pipeline includes a compressed air main pipeline and a plurality of compressed air branch pipelines connected with the compressed air main pipeline, the main combustion-gas pipeline, the main auxiliary-energy pipeline and the main compressed air pipeline are arranged between the first fracturing device group and the second fracturing device group. 
     For example, the fracturing system provided by an embodiment of the present disclosure further includes: a manifold system, located between the first fracturing device group and the second fracturing device group, and configured to transport fracturing fluid, the main combustion-gas pipeline, the main auxiliary-energy pipeline and the main compressed air pipeline are fixed on the manifold system, and the manifold system includes at least one high and low pressure manifold skid. 
     For example, in the fracturing system provided by an embodiment of the present disclosure, the combustion-gas pipeline connects the N+M turbine fracturing devices of the first fracturing device group and the second fracturing device group in series, to provide combustion-gas to the N+M turbine fracturing devices, the compressed air pipeline connects the N+M o turbine fracturing devices of the first fracturing device group and the second fracturing device group in series, to provide compressed air to the N+M turbine fracturing devices, the auxiliary-energy pipeline connects the N+M turbine fracturing devices of the first fracturing device group and the second fracturing device group in series, to provide auxiliary-energy to the auxiliary devices of the N+M turbine fracturing devices. 
     For example, in the fracturing system provided by an embodiment of the present disclosure, the combustion-gas pipeline includes a first sub combustion-gas pipeline and a second sub combustion-gas pipeline, the first sub combustion-gas pipeline connects the N turbine fracturing devices of the first fracturing device group in series, to provide combustion-gas to the N turbine fracturing devices, the second sub combustion-gas pipeline connects the M turbine fracturing devices of the second fracturing device group in series, to provide combustion-gas to the M turbine fracturing devices, 
     the compressed air pipeline includes a first sub compressed air pipeline and a second sub compressed air pipeline, the first sub compressed air pipeline connects the N turbine fracturing devices of the first fracturing device group in series, to provide compressed air to the N turbine fracturing devices, the second sub compressed air pipeline connects the M turbine fracturing devices of the second fracturing device group in series, to provide compressed air to the M turbine fracturing devices, and 
     the auxiliary-energy pipeline includes a first sub auxiliary-energy pipeline and a second sub auxiliary-energy pipeline, the first sub-auxiliary-energy pipeline connects the N turbine fracturing devices of the first fracturing device group in series, to provide auxiliary-energy to the auxiliary devices of the N turbine fracturing devices, the second sub-auxiliary-energy pipeline connects the M turbine fracturing devices of the second fracturing device group in series, to provide auxiliary-energy to the auxiliary devices of the M turbine fracturing devices. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to clearly illustrate the technical solution of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described. It is apparent that the described drawings are only related to some embodiments of the present disclosure and thus are not limitative of the present disclosure. 
         FIG.  1    is a schematic diagram of a combustion-gas supply system of a turbine fracturing vehicle; 
         FIG.  2    is a schematic diagram of a combustion-gas supply system provided by an embodiment of the present disclosure; 
         FIG.  3    is a schematic diagram of another combustion-gas supply system provided by an embodiment of the present disclosure; 
         FIG.  4    is a schematic diagram of another combustion-gas supply system provided by an embodiment of the present disclosure; 
         FIG.  5    is a schematic diagram of a device equipped with a turbine engine provided by an embodiment of the present disclosure; 
         FIG.  6    is a schematic diagram of another device equipped with a turbine engine working in groups provided by an embodiment of the present disclosure; 
         FIG.  7    is a schematic diagram of another device equipped with a turbine engine provided by an embodiment of the present disclosure; 
         FIG.  8    is a schematic diagram of a fracturing system provided by an embodiment of the present disclosure; 
         FIG.  9    is a schematic diagram of another fracturing system provided by an embodiment of the present disclosure; and 
         FIG.  10    is a schematic diagram of still another fracturing system provided by an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In order to make objects, technical details and advantages of embodiments of the present disclosure clear, the technical solutions of the embodiments will be described in a clearly and fully understandable way in connection with the related drawings. It is apparent that the described embodiments are just a part but not all of the embodiments of the present disclosure. Based on the described embodiments herein, those skilled in the art can obtain, without any inventive work, other embodiment(s) which should be within the scope of the present disclosure. 
     Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms “first,” “second,” etc., which are used in the description and claims of the present disclosure, are not intended to indicate any sequence, amount or importance, but distinguish various components. The terms “comprises,” “comprising,” “includes,” “including,” etc., are intended to specify that the elements or the objects stated before these terms encompass the elements or the objects listed after these terms as well as equivalents thereof, but do not exclude other elements or objects. The phrases “connect”, “connected”, etc., are not intended to define a physical connection or a mechanical connection, but may comprise an electrical connection which is direct or indirect. 
       FIG.  1    is a schematic diagram of a combustion-gas supply system of a turbine fracturing vehicle. As shown in  FIG.  1   , the combustion-gas supply system includes: a gas supply ball valve  01 , a gas pressure gauge  02 , a gas pressure sensor  03 , a gas temperature sensor  04 , a gas filter  05 , a gas supply solenoid valve  06 , a gas flow control valve  07 , a turbine engine gas one-way valve  08  that are connected by pipeline and are arranged in sequence. In this way, in a case that the combustion-gas supply system is operating, gas can enter a corresponding pipeline through the gas supply ball valve  01 ; the gas pressure sensor  03  and the gas temperature sensor  04  can detect pressure parameters and temperature parameters of the combustion-gas; subsequently, after filtering out impurities through the gas filter  05 , the filtered gas can reach a gas distribution valve block  09  of the turbine engine through the gas supply solenoid valve  06 , the gas flow control valve  07 , and the turbine engine gas one-way valve  08 . The gas distribution valve block  09  may then distribute the gas to various nozzles  10  in a combustion chamber of the turbine engine for combustion. 
     The combustion-gas supply system shown in  FIG.  1    can directly process wellhead gas generated by a fracturing wellhead by arranging the gas filter  05 , and the processed wellhead gas is supplied to the turbine engine. Therefore, the combustion-gas supply system can utilize the wellhead gas generated at a well site, so that a greater economic benefit can be achieved. However, the above-mentioned combustion-gas supply system has the following shortcomings: (1) after the operation is completed, the combustion-gas supply system cannot discharge remaining combustion-gas in the combustion-gas supply system, therefore, it has potential safety hazards; (2) the entire combustion-gas supply system is provided with only one gas supply interface, in a case that the gas at the wellhead is insufficient, a pipeline in front of the balloon valve  01  can only be removed, then is replaced by another pipeline, so that on-site operation is complicated and inefficient; (3) before each operation, the combustion-gas supply system is not provided with a separate pressure test interface; (4) in a case that a plurality of turbine fracturing vehicles are provided at the well site in the form of a vehicle group, the combustion-gas supply systems of the two adjacent fracturing vehicles cannot be communicated, so that a pipeline connection of the well site is complicated, and the cost is also increased. 
     In this regard, at least one embodiment of the present disclosure provides a combustion-gas supply system, a combustion-gas supply method, a device equipped with a turbine engine, and a fracturing system. The combustion-gas supply system includes a main pipeline and a multi-functional pipeline; the main pipeline includes a first sub-pipeline and a second sub-pipeline that is connected with the first sub-pipeline; the first sub-pipeline includes a first gas intake pipe, a first gas supply valve and a first gas outlet pipe arranged in sequence, the first gas intake pipe is configured to input combustion-gas; the second sub-pipeline includes a gas supply valve and a gas supply pipe, the first gas outlet pipe is connected with the combustion-gas supply valve, the gas supply pipe is configured to be connected with a turbine engine, the multi-functional pipeline includes a second gas intake pipe, a second gas supply valve and a second gas outlet pipe arranged in sequence, the second gas outlet pipe is communicated with the first gas outlet pipe. In this way, the combustion-gas supply system can introduce high-pressure gas (for example, high-pressure air) from the first gas outlet pipe of the first sub-pipeline through the multi-functional pipeline, to discharge residual combustion-gas in the first sub-pipeline, so that safety of the combustion-gas supply system is improved, and difficulty and cost of the on-site operation are reduced; on the other hand, the combustion-gas supply system can also carry out a pressure test on the main pipeline before the operation through the multi-functional pipeline, safety hazards such as leakage of the main pipeline are eliminated in advance; the combustion-gas supply system can further supply combustion-gas through the multi-functional pipeline in a case that the gas in the main pipeline is insufficient, so that stable and continuous operation of the entire combustion-gas supply system is guaranteed. 
     Hereinafter, the combustion-gas supply system, the combustion-gas supply method, the device equipped with the turbine engine, and the fracturing system provided by the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. 
       FIG.  2    is a schematic diagram of a combustion-gas supply system provided by an embodiment of the present disclosure. As shown in  FIG.  2   , the combustion-gas supply system  100  includes a main pipeline  110 , and the main pipeline  110  is used to supply combustion-gas directly to the turbine engine; the main pipeline  110  includes a first sub-pipeline  120  and a second sub-pipeline  130  that is connected with the first sub-pipeline  120 ; the first sub-pipeline  120  includes a first gas intake pipe  121 , a first gas supply valve  122  and a first gas outlet pipe  123  arranged in sequence, the first gas intake pipe  121  is configured to input combustion-gas; the second sub-pipeline  130  includes a gas supply valve  131  and a gas supply pipe  132 , the first gas outlet pipe  123  is connected with the combustion-gas supply valve  131 , and the gas supply pipe  132  is configured to connect with the turbine engine. 
     As shown in  FIG.  2   , the combustion-gas supply system  100  further includes a multi-functional pipeline  140 , the multi-functional pipeline  140  includes a second gas intake pipe  141 , a second gas supply valve  142  and a second gas outlet pipe  143  arranged in sequence, and the second gas outlet pipe  143  is communicated with the first gas outlet pipe  123 . It should be noted that, in the first sub-pipeline, the second sub-pipeline and the multi-functional pipeline mentioned above, other pipelines, other valves and other functional components may also be inserted between the pipelines, the valves and the functional components which are arranged in sequence, which are not limited in the embodiment of the present disclosure. 
     In the combustion-gas supply system provided by the embodiments of the present disclosure, because the second gas outlet pipe  143  of the multi-functional pipeline  140  is communicated with the first gas outlet pipe  123  of the first sub-pipeline  120 , for example, which can be connected through a three-way connection; after one operation is completed, the second gas supply valve  142  of the multi-functional pipeline  140  can be opened, so that high-pressure gas (for example, high pressure air or compressed air) is introduced into the first gas outlet pipe  123  of the first sub-pipeline  120  through the multi-functional pipeline  140 , in this case, because the combustion-gas supply valve  131  has been closed, the high-pressure gas introduced into the first gas outlet pipe  123  can flow to the first gas intake pipe  121 , thus the residual combustion-gas in the first sub-pipeline  120  is discharged, so that the safety of the combustion-gas supply system  100  is improved, and the on-site operation difficulty and cost are reduced. On the other hand, before the operation, the combustion-gas supply system  100  can block the first gas intake pipe  121 , then the high-pressure gas (for example, high pressure air or compressed air) is introduced into the first gas outlet pipe  123  of the first sub-pipeline  120  through the multi-functional pipeline  140 , so that the pressure test can be performed on the first sub-pipeline  120 , and safety hazards such as leakage of the main pipeline can be eliminated in advance. In addition, during the operation, in a case that the gas in the main pipeline  110  is insufficient, the combustion-gas supply system  100  can also supply combustion-gas through the multi-functional pipeline  140  to supplement the combustion-gas, so that stable and continuous operation of the entire combustion-gas supply system  100  is ensured. 
     For example, a pressure of the above-mentioned high-pressure gas is greater than one standard atmospheric pressure, that is, greater than 0.1 MPa. 
     For example, the above-mentioned gas may be natural gas, wellhead gas, or other gas that can be combusted by a turbine engine. 
     In some examples, as shown in  FIG.  2   , the first sub-pipeline  120  further includes a combustion-gas pressure regulating valve  124  and a bypass one-way valve  125 ; the combustion-gas pressure regulating valve  124  is located between the first gas supply valve  122  and the first gas outlet pipe  123 ; an input end  1251  of the bypass one-way valve  125  is communicated with the first gas outlet pipe  123 , an output end  1252  of the bypass one-way valve  125  is located between the combustion-gas pressure regulating valve  124  and the first gas supply valve  122 . The bypass one-way valve  125  is able to be flowed through in the direction from the input end  1251  to the output end  1252 , and is not able to be flowed through in the direction from the output end  1252  to the input end  1251 . With this arrangement, during operation, in a case that pressure of the combustion-gas is too high, the combustion-gas pressure regulating valve  124  can decompress the gas, so that pressure of the decompressed gas matches gas supply pressure of the turbine engine, and thus the safety of the combustion-gas supply system can be further improved. On the other hand, in a case that high-pressure gas is introduced into the first gas outlet pipe  123  of the first sub-pipeline  120  by using the multi-functional pipe  140  to discharge the residual combustion-gas in the first sub-pipeline  120 , because the combustion-gas pressure regulating valve  124  is turned off, the high pressure gas cannot enter the first gas intake pipe  121  from the combustion-gas pressure regulating valve  124 , by arranging the bypass one-way valve  125 , the high-pressure gas can enter the first gas intake pipe  121 , so that the residual combustion-gas in the first sub-pipeline  120  is discharged. 
     In some examples, as shown in  FIG.  2   , the first sub-pipeline  120  further includes at least one gas filter  126  and a gas source pressure gauge  127 ; the gas filter  126  is located between the first gas supply valve  122  and the combustion-gas pressure regulating valve  124 ; the gas source pressure gauge  127  is located between the first gas supply valve  122  and the gas filter  126 ; in this case, the output end  1252  of the bypass one-way valve  125  is located between the gas filter  126  and the combustion-gas pressure regulating valve  124  . 
     In the combustion-gas supply system provided in the example, the combustion-gas input from the first gas intake pipe  121  may be filtered and processed through at least one gas filter  160 , thus the combustion-gas supply system  100  can directly utilize wellhead gas, so that economic benefit can be greatly improved. In addition, due to problems such as unstable pressure and unstable supply of wellhead gas, the combustion-gas supply system  100  provided by the embodiment of the present disclosure can supply combustion-gas to the main pipeline  110  through the above-mentioned multi-functional pipeline  140  in a case that the wellhead gas is insufficient, so that stable and continuous operation of the entire combustion-gas supply system  100  is ensured. For example, the first gas intake pipe  121  is configured to connect the wellhead gas, the second gas intake pipe  141  of the multi-functional pipeline  140  is configured to be connected with a natural gas supply device, such as a natural gas storage tank. In addition, the gas source pressure gauge  127  can detect pressure of the combustion-gas input into the first gas intake pipe  121 , so as to monitor the input gas. In addition, the gas source pressure gauge  127  can present the pressure of the combustion-gas input in the first gas intake pipe  121  in a visualized manner, to facilitate monitoring by on-site personnel. 
     It should be noted that, although the gas source pressure gauge  127  shown in  FIG.  2    is located between the first gas supply valve  122  and the gas filter  126 , the arrangement of the gas source pressure gauge  127  in the combustion-gas supply system provided by the embodiment of the present disclosure is not limited thereto.  FIG.  3    is a schematic diagram of another combustion-gas supply system provided by an embodiment of the present disclosure. As shown in  FIG.  3   , the gas source pressure gauge  127  can also be arranged between the first gas intake pipe  121  and the first gas supply valve  122 . 
     In some examples, as shown in  FIGS.  2  and  3   , the first sub-pipeline  120  includes two gas filters  126 , so that redundancy of the gas filters  126  can be improved, and the safety can be improved. Of course, the embodiments of the present disclosure include but are not limited thereto, a number of the gas filters can also be set according to actual requirements. 
     In some examples, as shown in  FIG.  2   , the gas filter  126  is located between the first gas supply valve  122  and the combustion-gas pressure regulating valve  124 ; however, the embodiments of the present disclosure include but are not limited thereto, as shown in  FIG.  3   , the gas filter  126  may also be arranged on a side of the combustion-gas pressure regulating valve  124  away from the first gas supply valve  122 , that is, the input end  1251  of the bypass one-way valve  125 . 
     In some examples, as shown in  FIG.  2   , the first sub-pipeline  120  further includes a first pressure sensor  129 A, the first pressure sensor  129 A is between the first gas supply valve  122  and the gas filter  126 , and the first pressure sensor  129 A is configured to monitor supply pressure in real time. For example, the pressure value detected by the first pressure sensor  129 A may be sent to a local control terminal or a remote control terminal in a wired manner or a wireless manner. 
     In some examples, as shown in  FIG.  2   , the combustion-gas supply system  100  further includes a blowdown valve  160 ; and the blowdown valve  160  is between the first gas supply valve  122  and the combustion-gas pressure regulating valve  124 , and a height of the blowdown valve  160  is smaller than a height of the main pipeline  110 . It should be noted that, the above-mentioned height is a height with respect to the horizontal plane. In this way, the combustion-gas supply system  100  can discharge sundries in the main pipeline  110 , such as condensed water, through the blowdown valve  160 . It should be noted that, for better sewage discharge, the height of the blowdown valve  160  is also smaller than a height of a part of the gas delivery pipe where the blowdown valve  160  is located close to the first gas intake pipe  121 . It should be noted that, the embodiments of the present disclosure include but are not limited thereto, and the blowdown valve may also be arranged at other suitable positions. 
     In some examples, the main pipeline  110  and the multi-functional pipeline  140  may be substantially on a same plane, and the blowdown valve  160  is not located in the plane. In this way, in a case that the combustion-gas supply system is installed, a height of the blowdown valve  160  can be conveniently arranged to be less than a height of the main pipeline  110 . 
     In some examples, as shown in  FIGS.  2  and  3   , the first sub-pipeline  120  further includes: a gas temperature sensor  128  and a second pressure sensor  129 B; the gas temperature sensor  128  is located on the first gas outlet pipe  123  and is configured to detect temperature of the combustion-gas in the first gas outlet pipe  123 ; the second pressure sensor  129 B is located on the first gas outlet pipe  123  and is configured to detect pressure of the combustion-gas in the first gas outlet pipe  123 . In this way, the gas temperature sensor  128  and the second pressure sensor  129 B can detect the temperature and pressure of the combustion-gas in the first gas outlet pipe  123 , that is, the temperature and pressure of the combustion-gas entering the second sub-pipeline  130 . 
     It should be noted that, the embodiment of the present disclosure does not limit an arranging order of the gas temperature sensor  128  and the second pressure sensor  129 B; as shown in  FIG.  2   , the gas temperature sensor  128  may be arranged on a side of the second pressure sensor  129 B close to the first gas intake pipe  121 ; as shown in  FIG.  3   , the gas temperature sensor  128  may be arranged on a side of the second pressure sensor  129 B away from the first gas intake pipe  121 . 
     For example, a temperature value detected by the gas temperature sensor  128  and a pressure value detected by the second pressure sensor  129 B may be sent to a local control terminal or a remote control terminal in a wired manner or a wireless manner. 
     In some examples, as shown in  FIGS.  2  and  3   , a connection position of the second gas outlet pipe  143  of the multi-functional pipeline  140  and the first gas outlet pipe  123  of the first sub-pipeline  120  can be arranged with a three-way connection  181 ; in this case, the gas temperature sensor  128  or the second pressure sensor  129 B may be arranged at a position where the three-way connection  181  is located. Of course, the embodiments of the present disclosure include but are not limited thereto, the gas temperature sensor  128  and the gas pressure sensor  129  can also be both arranged on a side of the three-way connection  181  close to the first gas intake pipe  121 , or a side of the three-way connection  181  away from the first gas intake pipe  121 , or the gas temperature sensor  128  and the gas pressure sensor  129  are arranged on two sides of the three-way connection  181  respectively. 
     In some examples, as shown in  FIGS.  2  and  3   , the second sub-pipeline  130  further includes a flow control valve  134  and a gas one-way valve  135 ; the flow control valve  134  is located between the combustion-gas supply valve  131  and the gas supply pipe  132 ; an input end  1351  of the gas one-way valve  135  is connected with the flow control valve  134 , an output end  1352  of the gas one-way valve  1352  is communicated with the gas supply pipe  132 . In this way, the flow control valve  134  can control the flow of the gas, and the gas one-way valve can prevent backflow of the gas in the turbine engine. 
     In some examples, as shown in  FIGS.  2  and  3   , the combustion-gas supply valve  131  and the flow control valve  134  may be solenoid valves, and are electrically or communicatively connected with a control unit  260  (ECU) of the turbine engine. In this way, the opening, the closing, and the opening degree of the combustion-gas supply valve  131  and the flow control valve  134  can be controlled by a control unit  260  (ECU) of the turbine engine. For example, the control unit (ECU) of the turbine engine may determine the opening degree of the flow control valve  134  according to a level of a rotational speed. It should be noted that, the above-mentioned electrically connection refers to a connection through a signal line, the above-mentioned communicatively connection includes a case of being connected by a signal line, and also includes a case of being connected by a wireless manner (for example, a wireless manner such as Wifi, radio frequency, mobile network, etc.). 
     In some examples, as shown in  FIGS.  2  and  3   , the gas supply pipe  132  can be connected with a gas distribution valve block  210  of the turbine engine, and the gas distribution valve block  210  may then distribute the gas to various nozzles  220  within a combustion chamber of the turbine engine for combustion. 
     In some examples, as shown in  FIGS.  2  and  3   , the second sub-pipeline  130  further includes: a gas discharge valve  137 , which is located between the combustion-gas supply valve  131  and the gas one-way valve  135 . After one operation is completed, the gas discharge valve  137  can be used to discharge residual combustion-gas in the second sub-pipeline. 
     In some examples, the first gas supply valve  122 , the second gas supply valve  142 , and the blowdown valve  160  may adopt ball valves. Of course, the embodiments of the present disclosure include but are not limited thereto, the first gas supply valve  122 , the second gas supply valve  142  and the blowdown valve  160  may also adopt other types of valves. 
       FIG.  4    is a schematic diagram of another combustion-gas supply system provided by an embodiment of the present disclosure. As shown in  FIG.  4   , the combustion-gas supply system  100  further includes a main pipeline  110  and a multi-functional pipeline  140 ; the main pipeline  110  is used to supply combustion-gas directly to the turbine engine; the main pipeline  110  includes a first sub-pipeline  120  and a second sub-pipeline  130  connected with the first sub-pipeline  120 ; the first sub-pipeline  120  includes a first gas intake pipe  121 , a first gas supply valve  122  and a first gas outlet pipe  123  arranged in sequence, the first gas intake pipe  121  is configured to input gas; the second sub-pipeline  130  includes a gas supply valve  131  and a gas supply pipe  132 , the first gas outlet pipe  123  is connected with the combustion-gas supply valve  131 , the gas supply pipe  132  is configured to connect with the turbine engine; the multi-functional pipeline  140  includes a second gas intake pipe  141 , a second gas supply valve  142  and a second gas outlet pipe  143  arranged in sequence, and the second gas outlet pipe  143  is communicated with the first gas outlet pipe  123 . 
     As shown in  FIG.  4   , the combustion-gas supply system  100  further includes: a first gas supply interface  151 , a second gas supply interface  152  and a third gas supply interface  153 ; the first gas supply interface  151  includes a first gas delivery pipe  1510 , the first gas delivery pipe  1510  is communicated with the first gas intake pipe  121 ; the second gas supply interface  152  includes a second gas delivery pipe  1520 , the second gas delivery pipe  1520  is communicated with the first gas intake pipe  121 ; the third gas supply interface  153  includes a third gas delivery pipe  1530 , the third gas delivery pipe  1530  is communicated with the first gas intake pipe  121 ; pipe diameters of the second gas delivery pipe  1520  and the third gas delivery pipe  1530  are larger than a pipe diameter of the first gas delivery pipe  1510 , the pipe diameters of the second gas delivery pipe  1520  and the third gas delivery pipe  1530  are larger than a pipe diameter of the first gas intake pipe  121 . In this way, in the combustion-gas supply system  100 , the first gas supply interface  151 , the second gas supply interface  152  and the third gas supply interface  153  can all be used to supply combustion-gas to the first gas intake pipe  121 ; when an air supply volume or a gas supply pressure of any one of the first gas supply interface  151 , the second gas supply interface  152  and the third gas supply interface  153  is insufficient, gas can be quickly supplied to the first gas intake pipe  121  through the other two gas supply interfaces. In addition, because the pipe diameters of the second gas delivery pipe  1520  and the third gas delivery pipe  1530  are larger than the pipe diameter of the first gas delivery pipe  1510 , a plurality of combustion-gas supply systems  100  can achieve series operation by connecting the third gas supply interface  153  of one of two adjacent combustion-gas supply systems  100  with the second gas supply interface  152  of the other of the two adjacent combustion-gas supply systems  100 . 
     For example, both the pipe diameter of the second gas delivery pipe  1520  and the pipe diameter of the third gas delivery pipe  1530  are greater than or equal to two times of the pipe diameter of the first gas delivery pipe  1510 . For example, in a case that the diameter of the first gas delivery pipe  1510  is 2 inches, the diameters of the second gas delivery pipe  1520  and the third gas delivery pipe  1530  may be greater than or equal to 4 inches. 
     For example, as shown in  FIG.  4   , the first gas delivery pipe  1510 , the second gas delivery pipe  1520  and the third gas delivery pipe  1530  can be connected with the first gas intake pipe  121  through a four-way connection  182 . 
     In some examples, as shown in  FIG.  4   , the combustion-gas supply system  100  further includes a blowdown valve  160 , the blowdown valve  160  is located on at least one of the first gas delivery pipe  1510 , the second gas delivery pipe  1520  and the third gas delivery pipe  1530 , and a height of the blowdown valve  160  is less than a height of the main pipeline  110 . In this way, the combustion-gas supply system  100  can discharge the sundries in the main pipeline  110 , such as condensed water, through the blowdown valve  160 . It should be noted that, in order to better discharge sewage, the height of the blowdown valve  160  is also smaller than the height of a part of the gas delivery pipe where the blowdown valve  160  is located close to the first gas intake pipe  121 . 
     For example, the main pipeline  110  and the multi-functional pipeline  140  may be substantially on a same plane, and the blowdown valve  160  is not located in the plane. In this way, in a case that the combustion-gas supply system is installed, the height of the blowdown valve  160  can be conveniently arranged to be less than the height of the main pipeline  110 . 
     For example, as shown in  FIG.  4   , the blowdown valve  160  is located on the third gas delivery pipe  1530 ; of course, the embodiments of the present disclosure include but are not limited thereto, and the blowdown valve can also be located on the first gas delivery pipe or the second gas delivery pipe. 
     An embodiment of the present disclosure further provides a combustion-gas supply method of a combustion-gas supply system, the combustion-gas supply system may be a combustion-gas supply system provided by any of the above examples. The combustion-gas supply method includes: before supplying combustion-gas, opening the second gas supply valve, and introducing a first high-pressure gas into the first sub-pipeline through the multi-functional pipeline, to test pressure of the first sub-pipeline; and after the operation is completed, opening the second gas supply valve, and introducing a second high-pressure gas into the first sub-pipeline through the multi-functional pipeline, to discharge residual combustion-gas in the first sub-pipeline from the first gas intake pipe. 
     In the combustion-gas supply method provided by the embodiment of the present disclosure, before the operation, the first high-pressure gas (for example, high-pressure air) can be introduced into the first gas outlet pipe of the first sub-pipeline through the multi-functional pipeline, so that a pressure test can be performed on the first sub-pipeline, and safety hazards such as leakage of the main pipeline can be discharged in advance; after the operation, the second high-pressure gas can be introduced through the multi-functional pipeline, to discharge the residual combustion-gas in the first sub-pipeline, so that the safety of the combustion-gas supply system is improved, and the difficulty and cost of on-site operation are reduced. 
     It should be noted that, the above-mentioned first high-pressure gas and second high-pressure gas may be a same kind of gas, or may be different types of gas. In addition, pressures of the first high-pressure gas and the second high-pressure gas may be the same or different from each other, as long as the pressures are greater than 0.1 Mpa. Of course, in order to simplify the whole system and reduce the cost, the first high pressure gas and the second high pressure gas can both be compressed air. 
     In some examples, the combustion-gas supply method further includes: during operation, in a case that pressure of combustion-gas in the first gas outlet pipe is less than a preset value, opening the second gas supply valve, and introducing combustion-gas into the first gas outlet pipe through the multi-functional pipeline, so that the stable and continuous operation of the entire combustion-gas supply system is guaranteed. In particular, in a case that the combustion-gas supply system uses wellhead gas as the gas, due to the problems that the pressure of the wellhead gas is unstable and the supply of the wellhead gas is unstable, the combustion-gas supply method can supply combustion-gas to the main pipeline through the above-mentioned multi-functional pipeline in a case that the wellhead gas is insufficient, so that the stable and continuous operation of the entire combustion-gas supply system is guaranteed. 
     For example, the pressure of combustion-gas in the first gas outlet pipe can be detected by the second pressure sensor, then it is judged whether the pressure of combustion-gas is less than the preset value. 
     In some examples, the combustion-gas supply method further includes: connecting the first gas intake pipe to the wellhead gas, and connecting the second gas intake pipe of the multi-functional pipeline to the natural gas supply device, such as a natural gas storage tank. 
     In some examples, a plurality of combustion-gas supply systems can be arranged, referring to  FIG.  4   , the combustion-gas supply system  100  further includes: a first gas supply interface  151 , a second gas supply interface  152  and a third gas supply interface  153 ; the first gas supply interface  151  includes a first gas delivery pipe  1510 , and the first gas delivery pipe  1510  is communicated with the first gas intake pipe  121 ; the second gas supply interface  152  includes a second gas delivery pipe  1520 , and the second gas delivery pipe  1520  is communicated with the first gas intake pipe  121 ; the third gas supply interface  153  includes a third gas delivery pipe  1530 , and the third gas delivery pipe  1530  is communicated with the first gas intake pipe  121 ; both a pipe diameter of the second gas delivery pipe  1520  and a pipe diameter of the third gas delivery pipe  1530  are larger than a pipe diameter of the first gas delivery pipe  1510 , both the pipe diameter of the second gas delivery pipe  1520  and the pipe diameter of the third gas delivery pipe  1530  are larger than a pipe diameter of the first gas intake pipe  121 . In this case, the combustion-gas supply method further includes: connecting a third gas supply interface in one of two adjacent combustion-gas supply systems with a second gas supply interface in the other one of the two combustion-gas supply systems, to connect the plurality of combustion-gas supply systems in series. 
     In some examples, the combustion-gas supply system further includes: a blowdown valve, which is located on at least one of the first gas delivery pipe, the second gas delivery pipe and the third gas delivery pipe, a height of the blowdown valve is less than the height of the main pipeline; the combustion-gas supply method further includes: opening the blowdown valve to discharge sundries in the main pipeline. 
     Hereinafter, the combustion-gas supply method will be specifically described by taking the combustion-gas supply system shown in  FIG.  4    as an example. It is worth noting that, the combustion-gas supply method provided by the embodiments of the present disclosure includes but is not limited to the following specific execution steps. 
     In some examples, in a case that the combustion-gas supply system adopts the combustion-gas supply system shown in  FIG.  4   , the combustion-gas supply method may include: before the operation, connecting the second gas intake pipe  1411  of the multi-functional pipeline  140  to a pressure test pipeline, blocking the first gas supply interface  151 , the second gas supply interface  152  and the third gas supply interface  153  with plugs, closing the blowdown valve  160 , opening the first gas supply valve  122 , and ensuring that the combustion-gas supply valve  131  is in a closed state; then opening the second gas supply valve  142 , and introducing high-pressure gas into the first sub-pipeline  120  through the multi-functional pipeline  140 , so that a pressure test is performed on the first sub-pipeline  120 , and safety hazards such as leakage of the main pipeline are discharged in advance. 
     In some examples, in a case that the combustion-gas supply system adopts the combustion-gas supply system shown in  FIG.  4   , the combustion-gas supply method may include: during operation, connecting one of the first gas supply interface  151 , the second gas supply interface  152  and the third gas supply interface  153  with a combustion-gas source, blocking the other two gas supply interfaces with plugs, then adjusting the gas source pressure to a gas supply pressure (typically 250 psi) required by the turbine engine through the combustion-gas pressure regulating valve  124 , and starting the turbine engine for work in a case that everything is ready. 
     In some examples, in a case that the combustion-gas supply system adopts the combustion-gas supply system shown in  FIG.  4   , the combustion-gas supply method may include: during operation, if the gas source (such as the wellhead gas) is insufficient, the gas pressure sensor  129  detects that the gas supply pressure is low, connecting the second gas intake pipe  141  with a backup gas source (for example, a natural gas storage tank), opening the second gas supply valve  142 , thus backup gas enters the first sub-pipeline  120  through the multi-functional pipeline  140 , so that the backup air source can supplement the air supply of the turbine engine. 
     In some examples, in a case that the combustion-gas supply system adopts the combustion-gas supply system shown in  FIG.  4   , the combustion-gas supply method may include: after the operation is completed, ensuring that the second gas supply valve  142  is in a closed state, connecting the second gas intake pipe  141  with a compressed air source, and connecting one of the first gas supply interface  151 , the second gas supply interface  152  and the third gas supply interface  153  with a special container for collecting gas; after the connection is completed, opening the second gas supply valve  142 , thus the high-pressure gas enters the first sub-pipeline  120  through the multi-functional pipeline  140 , so that the gas remaining in the first sub-pipeline  120  in this case is replaced, and is discharged from the first gas supply interface  151 . 
     In some examples, in a case that the combustion-gas supply system adopts the combustion-gas supply system shown in  FIG.  4   , the combustion-gas supply method may include: after the remaining combustion-gas in the first sub-pipeline  120  is replaced, opening the blowdown valve  160 , to remove the sundries in the first sub-pipeline  120 , such as condensed water. 
     An embodiment of the present disclosure further provides a device equipped with a turbine engine.  FIG.  5    is a schematic diagram of a device equipped with a turbine engine provided by an embodiment of the present disclosure. As shown in  FIG.  5   , the device  500  includes a turbine engine  200  and a combustion-gas supply system  100 ; the combustion-gas supply system  100  may be a combustion-gas supply system provided by any one of the above examples. The turbine engine  200  includes a fuel nozzle  220 , and the gas supply pipe  132  is configured to provide fuel gas to the fuel nozzle  220 . 
     In some examples, as shown in  FIG.  5   , the device  500  further includes: a plunger pump  300 , which is connected with an output shaft  250  of the turbine engine  200 , and is configured to pressurize liquid using the power output by the turbine engine  200 . For example, the plunger pump  300  may pressurize fracturing fluid, then the pressurized fracturing fluid can be injected into the wellhead for fracturing operation. 
     In some examples, as shown in  FIG.  5   , the device  500  can be a mobile fracturing device, which includes a vehicle  510 ; in this case, the fuel combustion-gas supply system  100  further includes a first gas supply interface  151 , a second gas supply interface  152  and a third gas supply interface  153 ; the first gas supply interface  151  includes a first gas delivery pipe  1510 , which is connected with the first gas intake pipe  121 ; the second gas supply interface  152  includes a second gas delivery pipe  1520 , which is connected with the first gas intake pipe  121 ; the third gas supply interface  153  includes a third gas delivery pipe  1530 , which is connected with the first gas intake pipe  121 ; both a pipe diameter of the second gas delivery pipe  1520  and a pipe diameter of the third gas delivery pipe  1530  are larger than a pipe diameter of the first gas delivery pipe  1510 , and the pipe diameter of the second gas delivery pipe  1520  and the pipe diameter of the third gas delivery pipe  1530  are larger than a pipe diameter of the first gas intake pipe  121 . 
     As shown in  FIG.  5   , the second gas supply interface  152  and the third gas supply interface  153  are located on two sides of the vehicle  510 , respectively. In this way, in a case that a plurality of mobile fracturing devices are operated in a group, because the second gas supply interface  152  and the third gas supply interface  153  are located on two sides of the vehicle  510 , respectively, so that it is convenient to connect a plurality of combustion-gas supply systems  100  in series, thus the pipeline on site is simplified. It should be noted that, the two sides of the above vehicle refer to opposite sides in a direction perpendicular to an extension direction of a girder of the vehicle, or opposite sides in a direction perpendicular to an extension direction of the main pipeline of the combustion-gas supply system. 
       FIG.  6    is a schematic diagram of a device equipped with a turbine engine working in groups provided by an embodiment of the present disclosure. As shown in  FIG.  6   , the device  500  equipped with a turbine engine can be a turbine fracturing vehicle; four turbine fracturing vehicles  500  are arranged in turn and form a vehicle group; a second gas supply interface  152  of a turbine fracturing vehicle  500  (for example, the first turbine fracturing vehicle) in the vehicle group nearest to a gas source  600  (for example, a wellhead) is connected with the gas source, a third gas supply interface  153  of the turbine fracturing vehicle  500  closest to the gas source (for example, the wellhead) in the vehicle group is connected with a second gas supply interface  152  of an adjacent turbine fracturing vehicle  500  (for example, a second turbine fracturing vehicle); a third gas supply interface  153  of a second turbine fracturing vehicle  500  is connected with the second gas supply interface  152  of an adjacent turbine fracturing vehicle  500  (for example, a third turbine fracturing vehicle); a third gas supply interface  153  of the third turbine fracturing vehicle  500  is connected with a second gas supply interface  152  of an adjacent turbine fracturing vehicle  500  (for example, a fourth turbine fracturing vehicle). In this way, the four turbine fracturing vehicles  500  can realize series operation. 
       FIG.  7    is a schematic diagram of another device equipped with a turbine engine provided by an embodiment of the present disclosure. As shown in  FIG.  7   , the device  500  further includes a power generator  400 , which is connected with an output shaft  250  of the turbine engine  200 , and is configured to use power output by the turbine engine  200  to generate electricity. 
     In fracturing operations, in order to provide greater displacement and achieve higher efficiency, a plurality of fracturing devices are grouped for operation. The fracturing devices themselves need to suck in low-pressure fracturing fluid, and discharge high-pressure fracturing fluid, thus various liquid pipelines are required for transportation; on the other hand, each of the fracturing devices requires substances and energy such as fuel (such as natural gas), compressed air, and auxiliary-energy (such as electricity, diesel, etc.), and these substances and energy also need pipelines to transport. In this case, the pipeline including a plurality of fracturing devices grouped are very complicated, and high-pressure fluid, fuel, compressed air and auxiliary-energy are dangerous to device and personnel, thus a reasonable, efficient and clean pipeline system is necessary to be designed, to carry out safety management and device maintenance, so that safety accidents are avoided. 
     An embodiment of the present disclosure provides a fracturing system.  FIG.  8    is a schematic diagram of a fracturing system provided by an embodiment of the present disclosure. 
     As shown in  FIG.  8   , the fracturing system  5100  includes a first fracturing device group  5110 , a second fracturing device group  5120 , a combustion-gas pipeline  5130 , a compressed air pipeline  5140  and an auxiliary-energy pipeline  5150 ; the first fracturing device group  5110  includes N turbine fracturing devices  5200 ; the second fracturing device group  5120  includes M turbine fracturing devices  5200 ; the combustion-gas pipeline  5130  is respectively connected with the first fracturing device group  5110  and the second fracturing device group  5120 , and is configured to supply combustion-gas to the N+M turbine fracturing devices  5200 ; the compressed air pipeline  5140  is respectively connected with the first fracturing device group  5110  and the second fracturing device group  5120 , and is configured to provide compressed air to the N+M turbine fracturing devices  5200 ; each of the turbine fracturing devices  5200  includes an turbine engine  5220  an auxiliary device  5210 , and the auxiliary-energy pipeline  5150  is respectively connected with the first fracturing device group  5110  and the second fracturing device group  5120 , and is configured to provide auxiliary-energy to the auxiliary devices  210  of the N+M turbine fracturing devices  200 , in which N and M are positive integers greater than or equal to 2, respectively. 
     In the fracturing system provided by an embodiment of the present disclosure, the fracturing system includes a first fracturing device group and a second fracturing device group, the first fracturing device group includes N turbine fracturing devices, the second fracturing device group includes M turbine fracturing devices, in this way, the fracturing system can utilize a plurality of turbine fracturing devices grouped for fracturing operations, so that displacement and efficiency can be improved. On the other hand, the fracturing system further integrates the combustion-gas pipeline, compressed air pipeline and auxiliary-energy pipeline of the plurality of turbine fracturing devices, so that it is convenient to carry out safety management and device maintenance, and safety accidents are avoided. 
     In some examples, each of the turbine fracturing devices  5200  mentioned above includes a turbine engine and a combustion-gas supply system  100  described in any one of the above combustion-gas supply systems, the combustion-gas supply system  100  is connected with the combustion-gas pipeline  5130 , and is configured to provide combustion-gas to the turbine engine. 
     In some examples, as shown in  FIG.  8   , the values of M and N may be equal, for example, both are 6. Of course, the embodiments of the present disclosure include but are not limited thereto, the values of M and N may also be unequal. 
     In some examples, as shown in  FIG.  8   , the auxiliary device  5210  of each of the turbine fracturing devices  5200  includes a diesel engine, the auxiliary-energy pipeline  5150  is configured to deliver diesel fuel. 
     In some examples, the auxiliary device may further include an oil pump, a hydraulic system, and a hydraulic motor; the diesel engine can drive the oil pump, thereby driving the hydraulic system; the hydraulic system drives the hydraulic motor to complete various auxiliary tasks, such as, starting the turbine engine, driving a radiator to work, etc. Of course, the embodiments of the present disclosure include but are not limited thereto, the auxiliary device may further include a lubricating system and a lubricating oil pump, the diesel engine can drive the lubricating oil pump, thereby driving the lubricating system to work. 
     In some examples, as shown in  FIG.  8   , the auxiliary device  5210  of each of the turbine fracturing devices  5200  includes an electric motor, and the auxiliary-energy pipeline  5150  is configured to deliver electrical power. 
     In some examples, the auxiliary device may further include an oil pump, a hydraulic system, and a hydraulic motor; the electric motor can drive the oil pump, thereby driving the hydraulic system; the hydraulic system drives the hydraulic motor to complete various auxiliary tasks, such as starting the turbine engine, driving the radiator, etc. Of course, the embodiments of the present disclosure include but are not limited thereto, the auxiliary device may also include a lubricating system and a lubricating oil pump, the electric motor drives the lubricating oil pump, thereby driving lubrication. 
     In some examples, as shown in  FIG.  8   , each of the turbine fracturing devices  5200  includes a turbine engine  5220 , a fracturing pump  5230  and a transmission mechanism  5240 ; the turbine engine  5220  is connected with the fracturing pump  230  through the transmission mechanism  5240 . 
     In some examples, as shown in  FIG.  8   , the combustion-gas pipeline  5130  is configured to provide fuel, such as natural gas, to the turbine engine  5220  of each of the turbine fracturing devices  5200 . 
     In some examples, as shown in  FIG.  8   , the compressed air pipeline  5140  is configured to provide compressed air to the turbine engine  5220  of each of the turbine fracturing devices  5200 . 
     In some examples, as shown in  FIG.  8   , the combustion-gas pipeline  5130  includes a main combustion-gas pipeline  5132  and a plurality of combustion-gas branch pipelines  5134  that are connected with the main combustion-gas pipeline  5132 ; the compressed air pipeline  5140  includes a compressed air main pipeline  5142  and a plurality of compressed air branch pipelines  5144  that are connected with the compressed air main pipeline  5142 ; the auxiliary-energy pipeline  5150  includes an auxiliary-energy main pipeline  5152  and a plurality of auxiliary-energy branch pipelines  5154  that are connected with the auxiliary-energy main pipeline  5152 . The main combustion-gas pipeline  5132 , the auxiliary-energy main pipeline  5152  and the compressed air main pipeline  5142  are arranged between the first fracturing device group  5110  and the second fracturing device group  5120 , so that safety management and device maintenance of the combustion-gas pipeline, the auxiliary-energy pipeline and the compressed air pipeline are facilitated. 
     In some examples, as shown in  FIG.  8   , the plurality of gas branch pipelines  5134  of the combustion-gas pipeline  5130  are respectively connected with the N+M turbine fracturing devices  5200  of the first fracturing device group  5110  and the second fracturing device group  5120  located on two sides of the main combustion-gas pipeline  5132 , and provide combustion-gas for the N+M turbine fracturing devices  5200 . 
     In some examples, as shown in  FIG.  8   , the plurality of compressed air branch pipelines  5144  of the compressed air pipeline  5140  are respectively connected with the N+M turbine fracturing devices  5200  of the first fracturing device group  5110  and the second fracturing device group  5120  located on two sides of the compressed air main pipeline  5142 , and provide compressed air for the N+M turbine fracturing devices  5200 . 
     In some examples, as shown in  FIG.  8   , the plurality of auxiliary-energy branch pipelines  5154  of the auxiliary-energy pipeline  5150  are respectively connected with the N+M turbine fracturing devices  5200  of the first fracturing device group  5110  and the second fracturing device group  5120  located on two sides of the auxiliary-energy main pipeline  5152 , and provide auxiliary-energy for the N+M turbine fracturing devices  5200 . 
     In some examples, as shown in  FIG.  8   , the fracturing system  5100  further includes a manifold system  5160 , the manifold system  5160  is located between the first fracturing device group  5110  and the second fracturing device group  5120 , and is configured to deliver fracturing fluid. In this case, the main combustion-gas pipeline  5132 , the main auxiliary-energy pipeline  5152  and the main compressed air pipeline  5142  are fixed on the manifold system  5160 . In this way, the fracturing system integrates the manifold system for conveying fracturing fluid with combustion-gas pipeline, compressed air pipeline and auxiliary-energy pipeline, which can further facilitate safety management and device maintenance. 
     In some examples, as shown in  FIG.  8   , the manifold system  5160  includes at least one high and low pressure manifold skid  5162 ; each of the high and low pressure manifold skids  5162  is connected with at least one of the turbine fracturing devices  5200 , and is configured to deliver low pressure fracturing fluid to the at least one of the turbine fracturing devices  5200 , and collect high-pressure fracturing fluid output by the turbine fracturing device. 
     For example, as shown in  FIG.  8   , each of the high and low pressure manifold skids  5162  is connected with four turbine fracturing devices  5200 . Of course, the embodiments of the present disclosure include but are not limited thereto, the number of the turbine fracturing devices connected with each of the high and low pressure manifold skids can be arranged according to actual situations. 
     In some examples, as shown in  FIG.  8   , the manifold system  5160  includes a plurality of high and low pressure manifold skids  5162 ; the plurality of high and low pressure manifold skids  5162  may be connected through a first high pressure pipe  5164 . 
     For example, the first high pressure pipe can be a rigid pipe or a flexible pipe, which is not specifically limited in the embodiment of the present disclosure. 
     In some examples, as shown in  FIG.  8   , the manifold system  5160  further includes a second high pressure pipe  5166 , and the second high pressure pipe  5166  is communicated with a fracturing wellhead  5300 . 
     For example, the second high-pressure pipe may be a rigid pipe or a flexible pipe, which is not specifically limited in the embodiment of the present disclosure. 
     In some examples, as shown in  FIG.  8   , the fracturing device  5100  further includes a gas supply device  5170 , a compressed air supply device  5180  and an auxiliary-energy supply device  5190 ; the gas supply device  5170  is connected with the combustion-gas pipeline  5130 , the compressed air supply device  5180  is connected with the compressed air pipeline  5140 , and the auxiliary-energy supply device  5190  is connected with the auxiliary-energy pipeline  5150 . 
       FIG.  9    is a schematic diagram of another fracturing system provided by an embodiment of the present disclosure. As shown in  FIG.  9   , the combustion-gas pipeline  5130  connects the N+M turbine fracturing devices  5200  of the first fracturing device group  5110  and the second fracturing device group  5120  in series, to provide fuel gas to the N+M turbine fracturing devices  5200 . In this way, the fracturing device can connect the N+M turbine fracturing devices of the first fracturing device group and the second fracturing device group in series through the combustion-gas pipeline, so that it is convenient to carry out safety management and device maintenance of the combustion-gas pipeline of the fracturing system. 
     In some examples, as shown in  FIG.  9   , the compressed air pipeline  5140  connects the N+M turbine fracturing devices  5200  of the first fracturing device group  5110  and the second fracturing device group  5120  in series, to provide compressed air to the N+M turbine fracturing devices  5200 . In this way, the fracturing device can connect the N+M turbine fracturing devices of the first fracturing device group and the second fracturing device group in series through the compressed air pipeline, so that it is convenient to carry out safe management and device maintenance of the compressed air pipeline of the fracturing system. 
     In some examples, as shown in  FIG.  9   , the auxiliary-energy pipeline  5150  connects the N+M turbine fracturing devices  5200  of the first fracturing device group  5110  and the second fracturing device group  5120  in series, to provide auxiliary-energy to the auxiliary devices  5210  of the N+M turbine fracturing devices  5200 . In this way, the fracturing device can connect the N+M turbine fracturing devices of the first fracturing device group and the second fracturing device group in series through the auxiliary-energy pipeline, so that it is convenient to carry out safety management and device maintenance of auxiliary-energy pipeline of fracturing system. 
     In some examples, as shown in  FIG.  9   , the auxiliary device  5210  of each of the turbine fracturing devices  5200  includes a diesel engine, the auxiliary-energy pipeline  5150  is configured to deliver diesel fuel. 
     In some examples, the auxiliary device may further include an oil pump, a hydraulic system, and a hydraulic motor; the diesel engine can drive the oil pump, thereby driving the hydraulic system; the hydraulic system drives the hydraulic motor to complete various auxiliary tasks, such as, starting the turbine engine, driving the radiator to work, etc. Of course, the embodiments of the present disclosure include but are not limited thereto, the auxiliary device may further include a lubricating system and a lubricating oil pump, the diesel engine can drive the lubricating oil pump, thereby driving the lubricating system to work. 
     In some examples, as shown in  FIG.  9   , the auxiliary device  5210  of each of the turbine fracturing devices  5200  includes an electric motor, the auxiliary-energy pipeline  5150  is configured to deliver electrical power. 
     In some examples, the auxiliary device may further include an oil pump, a hydraulic system, and a hydraulic motor; the electric motor can drive the oil pump, thereby driving the hydraulic system; the hydraulic system drives the hydraulic motor to complete various auxiliary tasks, such as starting the turbine engine, driving the radiator, etc. Of course, the embodiments of the present disclosure include but are not limited thereto, the auxiliary device may further include a lubricating system and a lubricating oil pump, the electric motor drives the lubricating oil pump, thereby driving lubrication. 
     In some examples, as shown in  FIG.  9   , the fracturing device  5100  further includes a gas supply device  5170 , a compressed air supply device  5180  and an auxiliary-energy supply device  5190 ; the gas supply device  5170  is connected with the combustion-gas pipeline  5130 , the compressed air supply device  5180  is connected with the compressed air pipeline  5140 , and the auxiliary-energy supply device  5190  is connected with the auxiliary-energy pipeline  5150 . 
     In some examples, as shown in  FIG.  9   , the gas supply device  5170  may be connected with a fracturing device  5200  in the first fracturing device group  5110  or the second fracturing device group  5120 , which is close to the gas supply device  5170 , then the N+M turbine fracturing devices  5200  of the first fracturing device group  5110  and the second fracturing device group  5120  are connected in series, to provide fuel gas to the N+M turbine fracturing devices  5200 . 
     In some examples, as shown in  FIG.  9   , each of the turbine fracturing devices  5200  includes a turbine engine  5220 , a fracturing pump  5230  and a transmission mechanism  5240 ; the turbine engine  5220  is connected with the fracturing pump  5230  through the transmission mechanism  5240 ; the combustion-gas pipeline  5130  is configured to provide fuel, such as natural gas, to the turbine engine  5220  of each of the turbine fracturing devices  5200 . 
     In some examples, as shown in  FIG.  9   , the compressed air supply device  5180  may be connected with a fracturing device  5200  in the first fracturing device group  5110  or the second fracturing device group  5120 , which is close to the compressed air supply device  5180 , then the N+M turbine fracturing devices  5200  of the first fracturing device group  5110  and the second fracturing device group  5120  are connected in series, to provide compressed air to the N+M turbine fracturing devices  5200 . 
     In some examples, as shown in  FIG.  9   , the compressed air pipeline  5140  is configured to provide compressed air to the turbine engine  5220  of each of the turbine fracturing devices  5200 . 
     In some examples, as shown in  FIG.  9   , the auxiliary-energy supply device  5190  may be connected with a fracturing device  5200  in the first fracturing device group  5110  or the second fracturing device group  5120 , which is close to the auxiliary-energy supply device  5190 , then the N+M turbine fracturing devices  5200  of the first fracturing device group  5110  and the second fracturing device group  5120  are connected in series, to provide auxiliary-energy to the auxiliary devices  5210  of the N+M turbine fracturing devices 
     In some examples, as shown in  FIG.  9   , the manifold system  5160  includes at least one high and low pressure manifold skid  5162 ; each of the high and low pressure manifold skids  5162  is connected with at least one turbine fracturing device  5200 , is configured to deliver low pressure fracturing fluid to the turbine fracturing device  5200 , and collect high-pressure fracturing fluid output by the turbine fracturing device. 
     In some examples, as shown in  FIG.  9   , the manifold system  5160  includes a plurality of high and low pressure manifold skids  5162 ; the plurality of high and low pressure manifold skids  5162  may be connected through the first high pressure pipe  5164 . 
     In some examples, as shown in  FIG.  9   , the manifold system  5160  further includes a second high pressure pipe  5166 , the second high pressure pipe  5166  is communicated with the fracturing wellhead  5300 . 
       FIG.  10    is a schematic diagram of another fracturing system provided by an embodiment of the present disclosure. As shown in  FIG.  10   , the combustion-gas pipeline  5130  includes a first sub combustion-gas pipeline  5130 A and a second sub combustion-gas pipeline  5130 B, the first sub combustion-gas pipeline  5130 A connects the N turbine fracturing devices  5200  of the first fracturing device group  5110  in series, to provide fuel gas to the N turbine fracturing devices  5200 , the second sub combustion-gas pipeline  5130 B connects the M turbine fracturing devices  5200  of the second fracturing device group  5130 B in series, to provide fuel gas to the M turbine fracturing devices  5200 . In this way, the fracturing system provides fuel gas to the N turbine fracturing devices in the first fracturing device group and the M turbine fracturing devices in the second fracturing device group through the first sub combustion-gas pipeline and the second sub combustion-gas pipeline, respectively, so that safety management and device maintenance are facilitated. 
     In some examples, as shown in  FIG.  10   , the compressed air pipeline  5140  includes a first sub-compressed air pipeline  5140 A and a second sub-compressed air pipeline  5140 B, the first sub-compressed air pipeline  5140 A connects the N turbine fracturing devices  5200  of the first fracturing device group  5110  in series, to provide compressed air to the N turbine fracturing devices  5200 , the second sub-compressed air pipeline  5140 B connects the M turbine fracturing devices  5200  of the second fracturing device group  5120  in series, to provide compressed air to the M turbine fracturing devices  5200 . In this way, the fracturing system provides compressed air to the N turbine fracturing devices in the first fracturing device group and the M turbine fracturing devices in the second fracturing device group through the first sub-compressed air pipeline and the second sub-compressed air pipeline, respectively, so that safety management and device maintenance are facilitated. 
     In some examples, as shown in  FIG.  10   , the auxiliary-energy pipeline  5150  includes a first sub auxiliary-energy pipeline  5150 A and a second sub auxiliary-energy pipeline  5150 B, the first sub-auxiliary-energy pipeline  5150 A connects the N turbine fracturing devices  5200  of the first fracturing device group  5110  in series, to provide auxiliary-energy to the auxiliary devices  5210  of the N turbine fracturing devices  5200 , the second sub-auxiliary-energy pipeline  5150 B connects the M turbine fracturing devices  5200  of the second fracturing device group  5120  in series, to provide auxiliary-energy to the auxiliary devices  5210  of the M turbine fracturing devices  5200 . In this way, the fracturing system provides auxiliary-energy to the auxiliary devices of the N turbine fracturing devices in the first fracturing device group and the auxiliary devices of the M turbine fracturing devices in the second fracturing device group through the first sub auxiliary-energy pipeline and the second sub auxiliary-energy pipeline, respectively, so that safety management and device maintenance are facilitated. 
     The following points required to be explained: 
     (1) The accompanying drawings involve only the structure(s) in connection with the embodiment(s) of the present disclosure, and other structure(s) can be referred to common design(s). 
     (2) In case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments. 
     What have been described above are only specific implementations of the present disclosure, the protection scope of the present disclosure is not limited thereto, and easily conceivable changes or substitutions should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.