Patent Description:
Increasing the efficiency of power generation plants is in progress in response to demands for reduction of carbon dioxide, resource conservation, and the like. Specifically, increasing the temperature of a working fluid of a gas turbine, employing a combined cycle, and the like are actively in progress. Further, research and development of collection techniques of carbon dioxide are also in progress.

Under such circumstances, a gas turbine facility including a combustor which combusts a fuel and oxygen in a supercritical CO<NUM> atmosphere (to be referred to as a CO<NUM> gas turbine facility, hereinafter) is under consideration. In this CO<NUM> gas turbine facility, a part of a combustion gas produced in the combustor is circulated in a system as a working fluid.

Therefore, in the CO<NUM> gas turbine facility, excess oxygen and fuel preferably do not remain in the combustion gas discharged from the combustor. Thus, flow rates of the fuel and an oxidant are regulated so as to have a stoichiometric mixture ratio (equivalence ratio <NUM>), for example.

Incidentally, the equivalence ratio which is mentioned here is an equivalence ratio calculated based on a fuel flow rate and an oxygen flow rate. In other words, it is an equivalence ratio when it is assumed that the fuel and the oxygen are uniformly mixed (overall equivalence ratio).

In the combustor of the CO<NUM> gas turbine facility, a fuel-oxidant mixture mixed in the combustor is ignited by using an ignition device. At present, as the ignition device included in the combustor of the CO<NUM> gas turbine facility, a laser spark ignition device is under consideration. The laser ignition device irradiates the mixture inside the combustor with laser light to cause ignition.

The laser spark ignition device includes a laser oscillator, a lens, a heat-resistant glass provided in a casing part, and a laser passage pipe coupling a casing and a combustor liner, for example. Then, the interior of the combustor liner is irradiated through the lens, the heat-resistant glass, and the laser passage pipe with laser light emitted from the laser oscillator.

Then, the laser light is focused in the combustor liner. By the laser light being focused, an energy density increases. Then, gas in the portion where the energy density increases is plasmatized (breaks down) to ignite the mixture.

In the above-described laser ignition device of the CO<NUM> gas turbine facility, the combustion gas sometimes flows into the laser passage pipe. Then, an inner surface of the heat-resistant glass is exposed to the combustion gas and impurities such as soot adhere to the inner surface of the heat-resistant glass in some cases. This sometimes causes a reduction in transmittance of the laser light passing through the heat-resistant glass, resulting in not enabling stable ignition. An example of such a previously known gas turbine combustor is derivable from <CIT>, which forms basis for the two-part form of independent claims <NUM>, <NUM>, and <NUM>.

The above-described problems are addressed by means of a gas turbine combustor according to independent claims <NUM>, <NUM>, and/or <NUM>. Distinct embodiments are derivable from the dependent claims.

<FIG> is a system diagram of a gas turbine facility <NUM> including a combustor 20A of a first embodiment. As illustrated in <FIG>, the gas turbine facility <NUM> includes the combustor 20A which combusts a fuel and an oxidant, a pipe <NUM> which supplies the fuel to the combustor 20A, and a pipe <NUM> which supplies the oxidant to the combustor 20A. Further, the combustor 20A includes an ignition device 100A which ignites a mixture of the fuel and the oxidant in the combustor 20A. Note that the combustor 20A functions as a gas turbine combustor.

The pipe <NUM> includes a flow rate regulating valve <NUM> which regulates a flow rate of the fuel to be supplied into a combustor liner <NUM> of the combustor 20A. Here, as the fuel, for example, hydrocarbon such as methane or natural gas is used. Further, as the fuel, for example, a coal gasification gas fuel containing carbon monoxide, hydrogen, and the like can also be used. Note that the combustor liner <NUM> functions as a combustion cylinder.

The pipe <NUM> is provided with a compressor <NUM> which pressurizes the oxidant. As the oxidant, for example, oxygen separated from the atmosphere by an air separating apparatus (not illustrated) is used. The oxidant flowing through the pipe <NUM> is heated by passing through a heat exchanger <NUM> to be supplied to the combustor 20A.

The fuel and the oxidant guided to the combustor liner <NUM> undergo reaction (combustion) in a combustion region in the combustor liner <NUM> and are turned into a combustion gas. Here, in the gas turbine facility <NUM>, a part of the combustion gas exhausted from a turbine <NUM> is circulated in the system, which is described later. Therefore, excess oxidant (oxygen) and fuel preferably do not remain in the combustion gas discharged from the combustor liner <NUM>.

Thus, flow rates of the fuel and the oxidant are regulated so as to have a stoichiometric mixture ratio (equivalence ratio <NUM>), for example. Note that the equivalence ratio mentioned here is an equivalence ratio (overall equivalence ratio) when it is assumed that the fuel and the oxygen are uniformly mixed.

Further, the gas turbine facility <NUM> includes a turbine <NUM>, a generator <NUM>, a heat exchanger <NUM>, a cooler <NUM>, and a compressor <NUM>. Moreover, the gas turbine facility <NUM> includes a pipe <NUM> for circulating a part of the combustion gas discharged from the turbine <NUM> in the system.

The turbine <NUM> is moved rotationally by the combustion gas discharged from the combustor liner <NUM>. To the turbine <NUM>, for example, the generator <NUM> is coupled. The combustion gas discharged from the combustor liner <NUM>, which is mentioned here, is one containing a combustion product produced from the fuel and the oxidant and carbon dioxide to be circulated in the combustor liner <NUM> (a combustion gas from which water vapor has been removed).

The combustion gas discharged from the turbine <NUM> is guided to the pipe <NUM> and cooled by passing through the heat exchanger <NUM>. At this time, the oxidant flowing through the pipe <NUM> and carbon dioxide flowing through the pipe <NUM> to be circulated through the combustor 20A are heated by heat release from the combustion gas.

The combustion gas having passed through the heat exchanger <NUM> passes through the cooler <NUM>. By the combustion gas passing through the cooler <NUM>, the water vapor contained in the combustion gas is removed therefrom. At this time, the water vapor in the combustion gas condenses into water. This water is discharged through a pipe <NUM> to the outside, for example.

Here, as described previously, when the flow rates of the fuel and the oxidant are regulated so as to have the stoichiometric mixture ratio (equivalence ratio <NUM>), most of components of the combustion gas (dry combustion gas) from which the water vapor has been removed are carbon dioxide. Note that, for example, a slight amount of carbon monoxide, or the like is sometimes mixed in the combustion gas from which the water vapor has been removed, but hereinafter, the combustion gas from which the water vapor has been removed is simply referred to as carbon dioxide.

The carbon dioxide is pressurized to a pressure equal to or more than a critical pressure by the compressor <NUM> interposed in the pipe <NUM> to become a supercritical fluid. A part of the pressurized carbon dioxide flows through the pipe <NUM> and is heated in the heat exchanger <NUM>. Then, the carbon dioxide is guided between the combustor liner <NUM> and a cylinder body <NUM>. The temperature of the carbon dioxide having passed through the heat exchanger <NUM> becomes, for example, about <NUM>. Note that the pipe <NUM> which supplies carbon dioxide between the combustor liner <NUM> and the cylinder body <NUM> also functions as a first fluid supply part.

Another part of the pressurized carbon dioxide is introduced to a pipe <NUM> branching off from the pipe <NUM>, for example. The carbon dioxide introduced to the pipe <NUM> is guided between a combustor casing <NUM> and the cylinder body <NUM> as a cooling medium after its flow rate is regulated by a flow rate regulating valve <NUM>. The temperature of the carbon dioxide guided between the combustor casing <NUM> and the cylinder body <NUM> by the pipe <NUM> is, for example, about <NUM>.

This temperature of the carbon dioxide guided between the combustor casing <NUM> and the cylinder body <NUM> is lower than the previously-described temperature of the carbon dioxide guided between the combustor liner <NUM> and the cylinder body <NUM>. Note that the pipe <NUM> which supplies the carbon dioxide between the combustor casing <NUM> and the cylinder body <NUM> also functions as a first fluid supply part. Further, the combustor casing <NUM> functions as a casing.

Meanwhile, further another part of the pressurized carbon dioxide is introduced to a pipe <NUM> branching off from the pipe <NUM>. The carbon dioxide introduced to the pipe <NUM> is discharged to the outside after its flow rate is regulated by a flow rate regulating valve <NUM>. Note that the pipe <NUM> functions as a discharge pipe. The carbon dioxide discharged to the outside can be utilized for EOR (Enhanced Oil Recovery) or the like employed at an oil drilling field, for example.

Next, a configuration of the combustor 20A of the first embodiment is described in detail.

<FIG> is a view schematically illustrating a longitudinal section of the combustor 20A of the first embodiment. <FIG> is an enlarged view schematically illustrating a longitudinal section of the ignition device 100A in the combustor 20A of the first embodiment.

As illustrated in <FIG>, the combustor 20A includes a fuel nozzle part <NUM>, the combustor liner <NUM>, a transition piece <NUM>, the combustor casing <NUM>, the cylinder body <NUM>, and the ignition device 100A.

The fuel nozzle part <NUM> ejects the fuel supplied from the pipe <NUM> and the oxidant supplied from the pipe <NUM> into the combustor liner <NUM>. For example, the fuel is ejected from the center and the oxidant is ejected from the periphery of the center.

The combustor casing <NUM> is provided along a longitudinal direction of the combustor 20A so as to surround a part of the fuel nozzle part <NUM>, the combustor liner <NUM>, and the transition piece <NUM>, for example. The combustor casing <NUM> is divided into two parts in the longitudinal direction of the combustor 20A, for example. The combustor casing <NUM> is constituted of an upstream-side casing <NUM> on an upstream side and a downstream-side casing <NUM> on a downstream side, for example.

The upstream-side casing <NUM> is constituted by a cylinder body having one end (upstream end) thereof closed and the other end (downstream end) thereof opened, for example. In the center of the one end, an opening 71a into which the fuel nozzle part <NUM> is inserted is formed. Further, the pipe <NUM> is coupled to a side portion of the upstream-side casing <NUM>. The pipe <NUM> is fitted in and joined to an opening 71b formed in the side portion of the upstream-side casing <NUM>, for example.

The downstream-side casing <NUM> is constituted by a cylinder body having both ends thereof opened. One end of the downstream-side casing <NUM> is connected to the upstream-side casing <NUM>. The other end of the downstream-side casing <NUM> is connected to, for example, a casing surrounding the turbine <NUM>.

As illustrated in <FIG>, in the combustor casing <NUM>, the cylinder body <NUM> which surrounds peripheries of a part of the fuel nozzle part <NUM>, the combustor liner <NUM>, and the transition piece <NUM> and demarcates a space between the combustor casing <NUM> and the combustor liner <NUM> is provided. Predetermined spaces exist between the combustor liner <NUM> and the cylinder body <NUM> and between the combustor casing <NUM> and the cylinder body <NUM>.

The cylinder body <NUM> has one end (upstream end) thereof closed, in which an opening <NUM> into which the fuel nozzle part <NUM> is inserted is formed. The cylinder body <NUM> has the other end (downstream end) thereof closed, in which an opening <NUM> through which a downstream end of the transition piece <NUM> penetrates is formed. The cylinder body <NUM> is formed by joining a plate-shaped lid member 80a having the opening <NUM> therein to a cylindrical main body member 80b, for example.

A configuration of the cylinder body <NUM> is not limited as long as the cylinder body <NUM> has a structure which surrounds the peripheries of a part of the fuel nozzle part <NUM>, the combustor liner <NUM>, and the transition piece <NUM> as illustrated in <FIG>.

An inner peripheral surface of the downstream-side opening <NUM> in the cylinder body <NUM> is in contact with an outer peripheral surface of the downstream end portion of the transition piece <NUM>.

Further, the pipe <NUM> is coupled to an upstream-side side portion of the cylinder body <NUM>. The pipe <NUM> is coupled to the side portion of the cylinder body <NUM> by passing through the interior of the pipe <NUM> coupled to the side portion of the upstream-side casing <NUM>, as illustrated in <FIG>, for example. The pipe <NUM> and the pipe <NUM> passes through the interior of the pipe <NUM> form a double-pipe structure.

Incidentally, the pipe <NUM> is inserted through an opening 44a formed in the pipe <NUM> into the interior of the pipe <NUM>, for example. Then, the pipe <NUM> is joined to the pipe <NUM> in an opening portion having the opening 44a, for example. Further, the double-pipe structure of the pipe <NUM> and the pipe <NUM> is not limited to being provided at one place and may be plurally provided in a circumferential direction.

The ignition device 100A includes a pipe-shaped member <NUM>, a heat-resistant glass <NUM>, a laser light supply mechanism <NUM>, and a contact prevention mechanism 104A as illustrated in <FIG> and <FIG>.

The pipe-shaped member <NUM> is constituted by a cylindrical pipe having both ends thereof opened, or the like. The pipe-shaped member <NUM> is provided to penetrate the combustor casing <NUM>, the cylinder body <NUM>, and the combustor liner <NUM>. In other words, the pipe-shaped member <NUM> is disposed so as to penetrate through a coaxial circular communication hole (through hole) formed in each of the combustor casing <NUM>, the cylinder body <NUM>, and the combustor liner <NUM> from the direction perpendicular to the longitudinal direction of the combustor 20A.

Incidentally, an inner end portion 101a of the pipe-shaped member <NUM> is configured not to project to the interior of the combustor liner <NUM>. Further, an inside diameter of the pipe-shaped member <NUM> is set to the extent that laser light is not hindered when it passes through the interior of the pipe-shaped member <NUM>.

The heat-resistant glass <NUM> is provided on the outer side (combustor casing <NUM> side) in the pipe-shaped member <NUM>. Specifically, the heat-resistant glass <NUM> is preferably provided in the pipe-shaped member <NUM> on a side close to the outside than a flow path between the combustor casing <NUM> and the cylinder body <NUM>, through which the carbon dioxide flows. For example, the heat-resistant glass <NUM> is provided on an outer end portion 101b side of the pipe-shaped member <NUM>.

The heat-resistant glass <NUM> is provided so as to close the interior of the pipe-shaped member <NUM>. This shuts off communication between the inside and the outside of the combustor 20A.

The laser light supply mechanism <NUM> irradiates the interior of the combustor liner <NUM> through the heat-resistant glass <NUM> and the interior of the pipe-shaped member <NUM> with a laser light <NUM>. The laser light supply mechanism <NUM> includes a laser oscillator 103a and a condensing lens 103b.

The condensing lens 103b is provided outside the combustor casing <NUM> (downstream-side casing <NUM>) to face the heat-resistant glass <NUM>. That is, the condensing lens 103b is provided between the laser oscillator 103a and the heat-resistant glass <NUM>. A focal length and an installation position of the condensing lens 103b are set so as to have a focal point 11a at a position suitable for igniting the fuel-air mixture.

The laser oscillator 103a is disposed outside the combustor casing <NUM>. The laser oscillator 103a irradiates the interior of the combustor liner <NUM> through the condensing lens 103b, the heat-resistant glass <NUM>, and the interior of the pipe-shaped member <NUM> with the laser light <NUM>. That is, the laser oscillator 103a is disposed so as to be able to irradiate the interior of the combustor liner <NUM> with the laser light <NUM> by passing the laser light <NUM> through the condensing lens 103b, the heat-resistant glass <NUM>, and the interior of the pipe-shaped member <NUM> in this order.

Incidentally, the condensing lens 103b may be irradiated through an optical fiber with the laser light <NUM> oscillated by the laser oscillator 103a.

The contact prevention mechanism 104A prevents the combustion gas in the combustor liner <NUM> from coming into contact with the heat-resistant glass <NUM>. The contact prevention mechanism 104A includes a fluid supply part <NUM> and an ejection part <NUM>.

The fluid supply part <NUM> supplies a fluid for preventing the contact between the combustion gas in the combustor liner <NUM> and the heat-resistant glass <NUM>. Note that the fluid for preventing the contact between the combustion gas in the combustor liner <NUM> and the heat-resistant glass <NUM> is hereinafter referred to as a contact prevention fluid.

The fluid supply part <NUM> supplies the contact prevention fluid between the combustor casing <NUM> and the combustor liner <NUM>. Here, specifically, the fluid supply part <NUM> supplies the contact prevention fluid between the combustor liner <NUM> and the cylinder body <NUM>.

Here, the fluid supply part <NUM> is constituted of the pipe <NUM> which circulates the carbon dioxide heated in the heat exchanger <NUM> between the combustor liner <NUM> and the cylinder body <NUM>. Note that, the fluid supply part <NUM> functions as the first fluid supply part, and the contact prevention fluid to be supplied by the fluid supply part <NUM> functions as a first fluid.

Further, the carbon dioxide supplied between the combustor liner <NUM> and the cylinder body <NUM> also functions as a cooling medium to cool the combustor liner <NUM> and the transition piece <NUM> other than the function as the contact prevention fluid.

The ejection part <NUM> ejects the contact prevention fluid into the pipe-shaped member <NUM>. The ejection part <NUM> has a plurality of ejection holes <NUM> formed in a circumferential direction of the pipe-shaped member <NUM>.

The ejection part <NUM> is formed in the pipe-shaped member <NUM> located between the combustor liner <NUM> and the cylinder body <NUM>, for example. In other words, the ejection holes <NUM> are formed in the circumferential direction of the pipe-shaped member <NUM> located between the combustor liner <NUM> and the cylinder body <NUM>.

The ejection hole <NUM> is constituted by a circular hole, a slit, or the like. Further, the ejection holes <NUM> are disposed uniformly in the circumferential direction of the pipe-shaped member <NUM>. The ejection holes <NUM> each penetrate in a direction perpendicular to a center axis of the pipe-shaped member <NUM>, for example.

Here, a pressure of the contact prevention fluid to be ejected into the pipe-shaped member <NUM> is higher than a pressure in the combustor liner <NUM>. Therefore, the combustion gas flowing into the pipe-shaped member <NUM> does not pass through the ejection holes <NUM> to flow in between the combustor liner <NUM> and the cylinder body <NUM>. In other words, the contact prevention fluid ejected from the ejection holes <NUM> into the pipe-shaped member <NUM> flows into the combustor liner <NUM>.

Next, the operation of the combustor 20A is described.

At the time of ignition, the laser oscillator 103a is driven to oscillate the laser light <NUM>. The laser light <NUM> oscillated by the laser oscillator 103a passes through the condensing lens 103b and the heat-resistant glass <NUM> to enter the pipe-shaped member <NUM>. The laser light <NUM> having passed through the interior of the pipe-shaped member <NUM> is focused on the focal point 110a in a predetermined region in the combustor liner <NUM>. Note that the laser light <NUM> travels from the focal point 110a in a traveling direction while expanding a beam diameter.

After the irradiation of the interior of the combustor liner <NUM> with the laser light <NUM>, the fuel and the oxygen are ejected from the fuel nozzle part <NUM> into the combustor liner <NUM>. At this time, the fuel and the oxygen are ejected from the fuel nozzle part <NUM> in a state of the oxidant flow rate and the fuel flow rate being reduced in order to suppress a sudden heat load on the combustor 20A.

The oxidant and the fuel ejected from the fuel nozzle part <NUM> flow while mixing together to create a mixture. Then, when the mixture flows to a high energy density position where the laser light is focused on the focal point 110a, the mixture is ignited. This initiates combustion. Note that drive of the ignition device 100A is stopped when the combustion in the combustor liner <NUM> is stabilized, for example.

Then, after the ignition, the flow rate of the circulating carbon dioxide and the oxidant flow rate are increased to increase the pressure in the combustor, and at the same time, the fuel flow rate is increased to increase the combustion gas temperature in the combustor. Then, the fuel flow rate, the flow rate of the circulating carbon dioxide, and the oxidant flow rate are increased up to a rated load condition of the turbine.

Since the action of the combustion gas discharged from the combustor liner <NUM> has been already described with reference to <FIG>, flows of the carbon dioxide introduced from the pipe <NUM> and the pipe <NUM> into the combustor 20A are described here with reference to <FIG> and <FIG>.

A part of the carbon dioxide introduced from the pipe <NUM> into the cylinder body <NUM> functions as the contact prevention fluid. As illustrated in <FIG>, a part of the carbon dioxide passes through the ejection holes <NUM> of the pipe-shaped member <NUM> to be ejected into the pipe-shaped member <NUM>. Note that in <FIG>, flows of the contact prevention fluid (carbon dioxide) ejected from the ejection holes <NUM> are indicated by arrows.

The flows of the contact prevention fluid (carbon dioxide) ejected from the ejection holes <NUM> each travel in the direction perpendicular to the center axis of the pipe-shaped member <NUM>, and at the same time, turn to the combustor liner <NUM> side, as illustrated in <FIG>, for example. That is, in the pipe-shaped member <NUM>, a flow field toward the interior of the combustor liner <NUM> is formed by the contact prevention fluid ejected from the ejection holes <NUM>.

Further, in the interior of the pipe-shaped member <NUM> being an inner side of the ejection holes <NUM>, such a flow field as to shut off a cross section of the interior of the pipe-shaped member <NUM> is formed by the contact prevention fluid ejected from the plurality of ejection holes <NUM> formed in the circumferential direction.

Here, the contact prevention fluid to be ejected from the ejection holes <NUM> preferably has a penetration force to the extent of being capable of reaching the vicinity of the center axis of the pipe-shaped member <NUM>. Specifically, the contact prevention fluid to be ejected from the ejection holes <NUM> preferably has a penetration force to the extent of coming into contact with an outer periphery of the laser light <NUM> (laser beam) passing through the center of the pipe-shaped member <NUM>, for example.

The above-described flows formed by the contact prevention fluid ejected from the ejection holes <NUM> prevent the combustion gas in the combustor liner <NUM> from flowing into the pipe-shaped member <NUM>. Alternatively, the flows formed by the contact prevention fluid ejected from the ejection holes <NUM> prevent the combustion gas flowing from the interior of the combustor liner <NUM> into the pipe-shaped member <NUM> from flowing into the side closer to the heat-resistant glass <NUM> from positions formed with the ejection holes <NUM>.

This makes it possible to prevent the combustion gas in the combustor liner <NUM> from coming into contact with the heat-resistant glass <NUM> (an inner surface 102a of the heat-resistant glass <NUM>). Then, impurities such as soot contained in the combustion gas do not adhere to the inner surface 102a of the heat-resistant glass <NUM>. Therefore, it is possible to prevent a reduction in transmittance of the laser light <NUM> passing through the heat-resistant glass <NUM>.

Incidentally, the contact prevention fluid ejected from the ejection holes <NUM> into the pipe-shaped member <NUM> flows into the combustor liner <NUM>. The contact prevention fluid flowing into the combustor liner <NUM> is introduced into the transition piece <NUM> together with the combustion gas.

Here, a flow rate of the contact prevention fluid to be ejected to the pipe-shaped member <NUM> can be regulated by a hole diameter of the ejection hole <NUM> and the number of the ejection holes <NUM>. The flow rate of the contact prevention fluid to be ejected from the ejection holes <NUM> into the pipe-shaped member <NUM> is preferably a minimum flow rate which can prevent inflow of the combustion gas to the heat-resistant glass <NUM> side.

This allows flames to be formed in the combustor liner <NUM> without being affected by the contact prevention fluid flowing from the pipe-shaped member <NUM> into the combustor liner <NUM>.

On one hand, the remaining part of the carbon dioxide introduced from the pipe <NUM> into the cylinder body <NUM> flows through an annular space between the combustor liner <NUM> and the cylinder body <NUM> to the downstream side. At this time, the carbon dioxide cools the combustor liner <NUM> and the transition piece <NUM>.

Then, the carbon dioxide is introduced from, for example, holes <NUM>, <NUM> of a porous film cooling part, dilution holes <NUM>, and the like in the combustor liner <NUM> and the transition piece <NUM> into the combustor liner <NUM> and the transition piece <NUM>. The carbon dioxide introduced into the combustor liner <NUM> and the transition piece <NUM> is introduced to the turbine <NUM> together with the combustion gas produced by the combustion.

As illustrated in <FIG>, the low-temperature carbon dioxide flowing through the pipe <NUM> is guided to a double pipe constituted by the pipe <NUM> and the pipe <NUM>. The carbon dioxide guided to the double pipe passes through an annular passage between the pipe <NUM> and the pipe <NUM> to be guided between the combustor casing <NUM> and the cylinder body <NUM>.

The carbon dioxide guided between the combustor casing <NUM> and the cylinder body <NUM> flows through the annular space between the combustor casing <NUM> and the cylinder body <NUM> to the downstream side. At this time, the carbon dioxide cools the combustor casing <NUM>, the cylinder body <NUM>, and the pipe-shaped member <NUM> of the ignition device 100A. This carbon dioxide is used also for cooling stator blades <NUM> and rotor blades <NUM> of the turbine <NUM>, for example. By such cooling, the temperature of the combustor casing <NUM> becomes, for example, about <NUM>.

Therefore, it is possible to maintain the temperature of the combustor casing <NUM> with the heat-resistant glass <NUM> of the ignition device 100A installed therein to about <NUM> even at the time of the turbine rated load of the CO<NUM> gas turbine facility. That is, the temperature of the heat-resistant glass <NUM> of the ignition device 100A is maintained to about <NUM>.

According to the combustor 20A of the first embodiment as described above, including the contact prevention mechanism 104A makes it possible to prevent the contact between the heat-resistant glass <NUM> included in the pipe-shaped member <NUM> of the ignition device 100A and the combustion gas. Therefore, the impurities such as soot do not adhere to the inner surface 102a of the heat-resistant glass <NUM>. This prevents the reduction in transmittance of the laser light <NUM> passing through the heat-resistant glass <NUM>, resulting in enabling stable ignition.

Here, in the above-described embodiment, one example of the ejection holes <NUM> each penetrating in the direction perpendicular to the center axis of the pipe-shaped member <NUM> is indicated, but a configuration of the ejection hole <NUM> is not limited to this.

<FIG> is an enlarged view schematically illustrating a longitudinal section of the ignition device 100A including another configuration in the combustor 20A of the first embodiment.

As illustrated in <FIG>, ejection holes <NUM> may each be formed to be inclined to the end portion 101a side of the pipe-shaped member <NUM> relative to the direction perpendicular to the center axis of the pipe-shaped member <NUM>. That is, the ejection holes <NUM> may each be formed to be inclined so that an outlet of the ejection hole <NUM> is located closer to the end portion 101a side of the pipe-shaped member <NUM> than an inlet of the ejection hole <NUM>.

In this case, the contact prevention fluid ejected from the ejection holes <NUM> has a component of velocity along the center axis of the pipe-shaped member <NUM>. This makes it likely to form a flow field of the contact prevention fluid having a penetration force to the extent of coming into contact with an outer periphery of the laser light <NUM> (laser beam) passing through the center of the pipe-shaped member <NUM>. Then, the interior of the combustor liner <NUM> is irradiated with the laser light <NUM> in a state of suppressing an influence from the contact prevention fluid.

<FIG> is a view schematically illustrating a longitudinal section of a combustor 20B of a second embodiment not forming part of the invention. <FIG> is an enlarged view schematically illustrating a longitudinal section of an ignition device 100B in the combustor 20B of the second embodiment. Note that in the following embodiment, the same constituent portions as those of the combustor 20A of the first embodiment are denoted by the same reference signs, and redundant explanations are omitted or simplified.

The combustor 20B of the second embodiment has the same configuration as that of the combustor 20A of the first embodiment except a configuration of a contact prevention mechanism 104B of the ignition device 100B. Therefore, the configuration of the contact prevention mechanism 104B is mainly described here.

As illustrated in <FIG>, the ignition device 100B includes a pipe-shaped member <NUM>, a heat-resistant glass <NUM>, a laser light supply mechanism <NUM>, and the contact prevention mechanism 104B.

The contact prevention mechanism 104B prevents a combustion gas in a combustor liner <NUM> from coming into contact with the heat-resistant glass <NUM>. The contact prevention mechanism 104B includes a fluid supply part <NUM> and an ejection part <NUM>.

The fluid supply part <NUM> supplies a contact prevention fluid. The fluid supply part <NUM> supplies the contact prevention fluid between a combustor casing <NUM> and a cylinder body <NUM>.

Here, the fluid supply part <NUM> is constituted of a pipe <NUM> which circulates the carbon dioxide pressurized by the compressor <NUM> between the combustor casing <NUM> and the cylinder body <NUM>. Here, the carbon dioxide circulated by the pipe <NUM> is not heated in the heat exchanger <NUM>.

Incidentally, the fluid supply part <NUM> functions as a first fluid supply part, and the contact prevention fluid to be supplied by the fluid supply part <NUM> functions as a first fluid.

Further, the carbon dioxide supplied between the combustor casing <NUM> and the cylinder body <NUM> also functions as a cooling medium to cool the combustor casing <NUM>, the cylinder body <NUM> and the pipe-shaped member <NUM> of the ignition device 100B other than the function as the contact prevention fluid.

The ejection part <NUM> is formed in the pipe-shaped member <NUM> located between the combustor casing <NUM> and the cylinder body <NUM>, for example. In other words, the ejection holes <NUM> are formed in the circumferential direction of the pipe-shaped member <NUM> located between the combustor casing <NUM> and the cylinder body <NUM>.

A shape and a disposition configuration of the ejection holes <NUM> are the same as those of the ejection holes <NUM> of the first embodiment. Further, the ejection holes <NUM> each penetrate in a direction perpendicular to a center axis of the pipe-shaped member <NUM>, for example.

Incidentally, as exemplified by the first embodiment (refer to <FIG>), the ejection holes <NUM> may each be formed to be inclined to an end portion 101a side of the pipe-shaped member <NUM> relative to the direction perpendicular to the center axis of the pipe-shaped member <NUM>. An effect obtained by the above is the same as the effect described by the first embodiment.

Here, a pressure of the contact prevention fluid to be ejected into the pipe-shaped member <NUM> is higher than a pressure in the combustor liner <NUM>. Therefore, the combustion gas flowing into the pipe-shaped member <NUM> does not pass through the ejection holes <NUM> to flow in between the combustor casing <NUM> and the cylinder body <NUM>. In other words, the contact prevention fluid ejected from the ejection holes <NUM> into the pipe-shaped member <NUM> flows into the combustor liner <NUM>.

Next, the operation of the combustor 20B is described.

Here, the operation of the contact prevention mechanism 104B is described.

A part of the carbon dioxide introduced between the combustor casing <NUM> and the cylinder body <NUM> from the pipe <NUM> functions as the contact prevention fluid. As illustrated in <FIG>, a part of the carbon dioxide passes through the ejection holes <NUM> of the pipe-shaped member <NUM> to be ejected into the pipe-shaped member <NUM>. Note that in <FIG>, flows of the carbon dioxide (contact prevention fluid) ejected from the ejection holes <NUM> are indicated by arrows.

The flows of the carbon dioxide (contact prevention fluid) ejected from the ejection holes <NUM> are similar to the flows of the carbon dioxide (contact prevention fluid) ejected from the ejection holes <NUM> in the first embodiment. That is, the flows of the carbon dioxide (contact prevention fluid) ejected from the ejection holes <NUM> each travel in the direction perpendicular to the center axis of the pipe-shaped member <NUM>, and at the same time, turn to the combustor liner <NUM> side, as illustrated in <FIG>, for example.

Further, in the interior of the pipe-shaped member <NUM> being an inner side of the ejection holes <NUM>, such a flow field as to shut off a cross section of the interior of the pipe-shaped member <NUM> is formed by the carbon dioxide ejected from the plurality of ejection holes <NUM> formed in the circumferential direction.

The flows formed by the carbon dioxide ejected from the ejection holes <NUM> prevent the combustion gas in the combustor liner <NUM> from flowing into the pipe-shaped member <NUM>. Alternatively, the flows formed by the carbon dioxide ejected from the ejection holes <NUM> prevent the combustion gas flowing from the interior of the combustor liner <NUM> into the pipe-shaped member <NUM> from flowing into the side closer to the heat-resistant glass <NUM> from positions formed with the ejection holes <NUM>.

Incidentally, similarly to the first embodiment, a flow rate of the contact prevention fluid to be ejected to the pipe-shaped member <NUM> can be regulated by a hole diameter of the ejection hole <NUM> and the number of the ejection holes <NUM>. An effect obtained by the above is also the same as that of the first embodiment.

On one hand, the remaining part of the carbon dioxide introduced between the combustor casing <NUM> and the cylinder body <NUM> from the pipe <NUM> flows through an annular space between the combustor casing <NUM> and the cylinder body <NUM> to the downstream side. At this time, similarly to the first embodiment, the carbon dioxide cools the combustor casing <NUM>, the cylinder body <NUM> and the pipe-shaped member <NUM> of the ignition device 110B.

According to the combustor 20B of the second embodiment as described above, including the contact prevention mechanism 104B makes it possible to prevent the contact between the heat-resistant glass <NUM> included in the pipe-shaped member <NUM> of the ignition device 100B and the combustion gas. Therefore, the impurities such as soot do not adhere to the inner surface 102a of the heat-resistant glass <NUM>. This prevents the reduction in transmittance of the laser light <NUM> passing through the heat-resistant glass <NUM>, resulting in enabling stable ignition.

<FIG> is an enlarged view schematically illustrating a longitudinal section of an ignition device 100C in a combustor 20C of a third embodiment.

The combustor 20C of the third embodiment has the same configuration as that of the combustor 20A of the first embodiment except a configuration of a contact prevention mechanism 104C of the ignition device 100C. Therefore, the configuration of the contact prevention mechanism 104C is mainly described here.

As illustrated in <FIG>, the ignition device 100C includes a pipe-shaped member <NUM>, a heat-resistant glass <NUM>, a laser light supply mechanism <NUM>, and the contact prevention mechanism 104C.

The contact prevention mechanism 104C prevents a combustion gas in a combustor liner <NUM> from coming into contact with the heat-resistant glass <NUM>. The contact prevention mechanism 104C includes an annular groove <NUM>, a flow path <NUM>, a fluid supply part <NUM> and an ejection part <NUM>.

The annular groove <NUM> is formed around a periphery of the pipe-shaped member <NUM> in a combustor casing <NUM> (for example, a downstream-side casing <NUM>) through which the pipe-shaped member <NUM> penetrates. The annular groove <NUM> is formed on a side closer to a combustor liner <NUM> from the heat-resistant glass <NUM> in the combustor casing <NUM>.

The flow path <NUM> is a flow path coupling the outside of the combustor casing <NUM> and the annular groove <NUM>. The flow path <NUM> is constituted by a through hole penetrating from a side surface of the combustor casing <NUM> to the annular groove <NUM>.

The fluid supply part <NUM> supplies a contact prevention fluid to the flow path <NUM>. Specifically, the fluid supply part <NUM> is coupled to the flow path <NUM>.

Here, the fluid supply part <NUM> may be constituted by a pipe branching off from the pipe <NUM> which circulates the carbon dioxide heated in the heat exchanger <NUM> between the combustor liner <NUM> and the cylinder body <NUM> (refer to <FIG>), for example.

Further, the fluid supply part <NUM> may be constituted by a pipe branching off from the pipe <NUM> which circulates the carbon dioxide pressurized by the compressor <NUM> between the combustor casing <NUM> and the cylinder body <NUM> (refer to <FIG>), for example.

Here, when the fluid supply part <NUM> is constituted by each of the pipes branching off from the system of the gas turbine facility <NUM> as described above, a filter (not illustrated) is preferably interposed in the fluid supply part <NUM>. Passing through the filter enables removal of foreign matter contained in a flow of the carbon dioxide. This makes it possible to prevent the foreign matter from flowing into the combustor liner <NUM> and the turbine <NUM>.

Moreover, the fluid supply part <NUM> may be a supply system (supply pipe) other than the system of the gas turbine facility <NUM>, for example. Also in this case, the fluid supply part <NUM> supplies carbon dioxide at a supercritical pressure as the contact prevention fluid to the flow path <NUM>.

Here, even in any of the above-described configurations, the fluid supply part <NUM> supplies the contact prevention fluid to the flow path <NUM> so that a pressure of the contact prevention fluid to be ejected from the ejection part <NUM> into the pipe-shaped member <NUM> is higher than a pressure in the combustor liner <NUM>.

Incidentally, the fluid supply part <NUM> functions as a second fluid supply part. Further, the contact prevention fluid to be supplied from the fluid supply part <NUM> functions as a second fluid.

The ejection part <NUM> ejects the contact prevention fluid supplied to the annular groove <NUM> into the pipe-shaped member <NUM>. The ejection part <NUM> has a plurality of ejection holes <NUM> formed in a circumferential direction of the pipe-shaped member <NUM>.

The ejection part <NUM> is formed in the pipe-shaped member <NUM> in a position formed with the annular groove <NUM>, as illustrated in <FIG>. In other words, the ejection holes <NUM> are formed in the circumferential direction of the pipe-shaped member <NUM> in the position formed with the annular groove <NUM>.

Here, the pressure of the contact prevention fluid to be ejected into the pipe-shaped member <NUM> is higher than the pressure in the combustor liner <NUM>. Therefore, the combustion gas flowing into the pipe-shaped member <NUM> does not pass through the ejection holes <NUM> to flow into the annular groove <NUM>. In other words, the contact prevention fluid ejected from the ejection holes <NUM> into the pipe-shaped member <NUM> flows into the combustor liner <NUM>.

Next, the operation of the combustor 20C is described.

Here, the operation of the contact prevention mechanism 104C is described.

The contact prevention fluid supplied from the fluid supply part <NUM> to the annular groove <NUM> expands in the circumferential direction in the annular groove <NUM>. The contact prevention fluid expanded in the circumferential direction in the annular groove <NUM> is ejected through the ejection holes <NUM> of the pipe-shaped member <NUM> into the pipe-shaped member <NUM>. Note that in <FIG>, flows of the contact prevention fluid ejected from the ejection holes <NUM> are indicated by arrows. Further, a flow rate of the contact prevention fluid ejected from each of the ejection holes <NUM> is nearly uniform. Here, for example, fixing an end portion 101b on an outer side of the pipe-shaped member <NUM> to the combustor casing <NUM> by welding prevents the contact prevention fluid introduced to the annular groove <NUM> from leaking outside the combustor casing <NUM>.

The flows of the carbon dioxide (contact prevention fluid) ejected from the ejection holes <NUM> are similar to the flows of the carbon dioxide (contact prevention fluid) ejected from the ejection holes <NUM> in the first embodiment. That is, the flows of the contact prevention fluid ejected from the ejection holes <NUM> each travel in the direction perpendicular to the center axis of the pipe-shaped member <NUM>, and at the same time, turn to the combustor liner <NUM> side, as illustrated in <FIG>, for example.

The flows formed by the contact prevention fluid ejected from the ejection holes <NUM> prevent the combustion gas in the combustor liner <NUM> from flowing into the pipe-shaped member <NUM>. Alternatively, the flows formed by the contact prevention fluid ejected from the ejection holes <NUM> prevent the combustion gas flowing from the interior of the combustor liner <NUM> into the pipe-shaped member <NUM> from flowing into the side closer to the heat-resistant glass <NUM> from positions formed with the ejection holes <NUM>.

According to the combustor 20C of the third embodiment as described above, including the contact prevention mechanism 104C makes it possible to prevent the contact between the heat-resistant glass <NUM> included in the pipe-shaped member <NUM> of the ignition device 100C and the combustion gas. Therefore, the impurities such as soot do not adhere to the inner surface 102a of the heat-resistant glass <NUM>. This prevents the reduction in transmittance of the laser light <NUM> passing through the heat-resistant glass <NUM>, resulting in enabling stable ignition.

Here, a configuration of the contact prevention mechanism 104C in the combustor 20C is not limited to the above-described structure. <FIG> is an enlarged view schematically illustrating a longitudinal section of the ignition device 100C including another configuration in the combustor 20C of the third embodiment.

As illustrated in <FIG>, the contact prevention mechanism 104C may be provided outside the combustor casing <NUM>.

In this case, the pipe-shaped member <NUM> is constituted by a cylindrical pipe having both ends thereof opened, or the like. The pipe-shaped member <NUM> is provided to penetrate the combustor casing <NUM>, the cylinder body <NUM> and the combustor liner <NUM>.

Further, one end side of the pipe-shaped member <NUM> projects from the combustor casing <NUM> to the outside. That is, the one end side of the pipe-shaped member <NUM> is extended to the outside of the combustor casing <NUM>. Note that in the pipe-shaped member <NUM>, a portion projecting from the combustor casing <NUM> to the outside is referred to as an outside projecting portion 101e.

Further, on an outer periphery of the outside projecting portion 101e of the pipe-shaped member <NUM>, for example, a flange 101c is included. Then, attaching the flange 101c on an outer surface of the combustor casing <NUM> makes the pipe-shaped member <NUM> be fixed thereto.

The outside projecting portion 101e is provided with the contact prevention mechanism 104C. Then, the heat-resistant glass <NUM> is disposed in the pipe-shaped member <NUM> on a side closer to the outside (laser light supply mechanism <NUM> side) than a position provided with the contact prevention mechanism 104C.

The contact prevention mechanism 104C includes an annular member <NUM>, a fluid supply part <NUM> and an ejection part <NUM>.

The annular member <NUM> is provided on the outer periphery of the outside projecting portion 101e over the circumferential direction, as illustrated in <FIG>. A cross-sectional shape perpendicular to the circumferential direction in the annular member <NUM> is a U-shape. Then, the annular member <NUM> has a hollow portion. An open side (inner peripheral side) of the annular member <NUM> is joined to the outer periphery of the outside projecting portion 101e. By including the annular member <NUM> as described above, an annular passage <NUM> is formed on the outer periphery of the outside projecting portion 101e.

Further, the annular member <NUM> is disposed between a position provided with the flange 101c and a position provided with the heat-resistant glass <NUM> in an axial direction of the pipe-shaped member <NUM>.

The fluid supply part <NUM> supplies the contact prevention fluid to the annular passage <NUM>. Specifically, the fluid supply part <NUM> is connected to the annular member <NUM>. Note that a pipe constituting the fluid supply part <NUM>, or the like is as previously described.

The ejection part <NUM> ejects the contact prevention fluid supplied to the annular passage <NUM> in the annular member <NUM> into the pipe-shaped member <NUM>. The ejection part <NUM> has a plurality of ejection holes <NUM> formed in a circumferential direction of the outside projecting portion 101e.

The ejection holes <NUM> are formed in the pipe-shaped member <NUM> in a position formed with the annular passage <NUM>, as illustrated in <FIG>. In other words, the ejection holes <NUM> are formed in the circumferential direction of the outside projecting portion 101e in the position formed with the annular passage <NUM>. A shape and a configuration of the ejection holes <NUM> are the same as the previously-described shape and configuration of the ejection holes <NUM>.

Here, the contact prevention fluid supplied from the fluid supply part <NUM> to the annular passage <NUM> expands in the circumferential direction in the annular passage <NUM>. Then, the contact prevention fluid expanded in the annular passage <NUM> is ejected from the ejection holes <NUM> into the pipe-shaped member <NUM>. Flows of the contact prevention fluid ejected from the ejection holes <NUM> into the pipe-shaped member <NUM> are similar to the previously-described flows of the contact prevention fluid ejected from the ejection holes <NUM> into the pipe-shaped member <NUM>.

Incidentally, a pressure of the contact prevention fluid to be ejected into the pipe-shaped member <NUM> is higher than a pressure in the combustor liner <NUM>. Therefore, the combustion gas flowing into the pipe-shaped member <NUM> does not pass through the ejection holes <NUM> to flow into the annular passage <NUM>. In other words, the contact prevention fluid ejected from the ejection holes <NUM> into the pipe-shaped member <NUM> flows into the combustor liner <NUM>.

<FIG> is an enlarged view schematically illustrating a longitudinal section of an ignition device 100D in a combustor 20D of a fourth embodiment not forming part of the invention.

The combustor 20D of the fourth embodiment not forming part of the invention has the same configuration as that of the combustor 20A of the first embodiment except a configuration of a contact prevention mechanism 104D of the ignition device 100D. Therefore, the configuration of the contact prevention mechanism 104D is mainly described here.

As illustrated in <FIG>, the ignition device 100D includes a pipe-shaped member <NUM>, a heat-resistant glass <NUM>, a laser light supply mechanism <NUM>, and the contact prevention mechanism 104D.

The contact prevention mechanism 104D prevents a combustion gas in a combustor liner <NUM> from coming into contact with the heat-resistant glass <NUM>. The contact prevention mechanism 104D includes an orifice member <NUM>.

The orifice member <NUM> is constituted by a circular plate-shaped member provided in the pipe-shaped member <NUM>. The orifice member <NUM> has a through hole <NUM> which passes a laser light <NUM> through the center thereof.

An outer periphery of the orifice member <NUM> is in contact with an inner periphery of the pipe-shaped member <NUM>. Such a configuration makes it possible to prevent the combustion gas from flowing from between the outer periphery of the orifice member <NUM> and an inner surface of the pipe-shaped member <NUM> into the heat-resistant glass <NUM> side. Note that an outer shape of the orifice member <NUM> is formed to correspond to a shape of an interior of the pipe-shaped member <NUM> in which the orifice member <NUM> is disposed.

A bore of the through hole <NUM> is set to a size to the extent that the laser light <NUM> is not prevented from passing therethrough.

Here, one example of including the orifice member <NUM> in the pipe-shaped member <NUM> between a combustor casing <NUM> and a cylinder body <NUM> is indicated, but this configuration is not restrictive.

For example, the orifice member <NUM> may be included in the pipe-shaped member <NUM> between a combustor liner <NUM> and the cylinder body <NUM>.

Here, since the laser light <NUM> is focused by a condensing lens 103b, a beam diameter of the laser light <NUM> is reduced to a focal point 110a. Therefore, including the orifice member <NUM> on the combustor liner <NUM> side allows the bore of the through hole <NUM> to be smaller. This makes it possible to more securely suppress a flow of the combustion gas flowing through the through hole <NUM> into the heat-resistant glass <NUM> side.

Next, the operation of the combustor 20D is described.

Here, the operation of the contact prevention mechanism 104D is described.

At the time of ignition, the laser light <NUM> oscillated by a laser oscillator 103a passes through the condensing lens 103b, the heat-resistant glass <NUM>, and the through hole <NUM> of the orifice member <NUM> to enter the pipe-shaped member <NUM>. The laser light <NUM> having passed through the interior of the pipe-shaped member <NUM> is focused on the focal point 110a in a predetermined region in the combustor liner <NUM>.

The inflow to the heat-resistant glass <NUM> side of the combustion gas flowing into the pipe-shaped member <NUM> is blocked by the orifice member <NUM>. Note that even though the combustion gas flows through the through hole <NUM> to the heat-resistant glass <NUM> side, a flow amount thereof is a very small amount. Therefore, impurities such as soot do not adhere to an inner surface 102a of the heat-resistant glass <NUM>.

According to the combustor 20D of the fourth embodiment not forming part of the invention as described above, including the contact prevention mechanism 104D makes it possible to suppress the contact between the heat-resistant glass <NUM> included in the pipe-shaped member <NUM> of the ignition device 100D and the combustion gas. Therefore, the impurities such as soot do not adhere to the inner surface 102a of the heat-resistant glass <NUM>. This prevents the reduction in transmittance of the laser light <NUM> passing through the heat-resistant glass <NUM>, resulting in enabling stable ignition.

Here, a configuration of the combustor 20D of the fourth embodiment not forming part of the invention is not limited to the above-described configuration.

For example, when the orifice member <NUM> is included in the pipe-shaped member <NUM> between the combustor casing <NUM> and the cylinder body <NUM>, the contact prevention mechanism 104C of the third embodiment may be further included. Further, when the orifice member <NUM> is included in the pipe-shaped member <NUM> between the combustor casing <NUM> and the cylinder body <NUM>, the contact prevention mechanism 104B of the second embodiment may be further included on the combustor casing <NUM> side of the orifice member <NUM>.

For example, when the orifice member <NUM> is included in the pipe-shaped member <NUM> between the combustor liner <NUM> and the cylinder body <NUM>, the contact prevention mechanism 104B of the second embodiment or the contact prevention mechanism 104C of the third embodiment may be further included. Further, when the orifice member <NUM> is included in the pipe-shaped member <NUM> between the combustor liner <NUM> and the cylinder body <NUM>, the contact prevention mechanism 104A of the first embodiment may be further included on the combustor casing <NUM> side of the orifice member <NUM>.

In any of the cases, the contact prevention fluids ejected from the ejection holes <NUM>, <NUM>, <NUM> of the contact prevention mechanisms 104A, 104B, 104C into the pipe-shaped member <NUM> each flow through the through hole <NUM> of the orifice member <NUM> to the combustor liner <NUM> side. This makes it possible to prevent the combustion gas from flowing through the through hole <NUM> to the heat-resistant glass <NUM> side.

<FIG> is an enlarged view schematically illustrating a longitudinal section of an ignition device 100E in a combustor 20E of a fifth embodiment not forming part of the invention. Note that <FIG> illustrates a state where a shutoff valve <NUM> is opened.

The combustor 20E of the fifth embodiment not forming part of the invention has the same configuration as that of the combustor 20A of the first embodiment except a configuration of a contact prevention mechanism 104E of the ignition device 100E. Therefore, the configuration of the contact prevention mechanism 104E is mainly described here.

As illustrated in <FIG>, the ignition device 100E includes a pipe-shaped member <NUM>, a heat-resistant glass <NUM>, a laser light supply mechanism <NUM>, and the contact prevention mechanism 104E.

The pipe-shaped member <NUM> is constituted by a cylindrical pipe having both ends thereof opened, or the like. The pipe-shaped member <NUM> is provided to penetrate a combustor casing <NUM>, a cylinder body <NUM> and a combustor liner <NUM>. Further, one end side of the pipe-shaped member <NUM> projects from the combustor casing <NUM> to the outside. That is, the one end side of the pipe-shaped member <NUM> is extended to the outside of the combustor casing <NUM>. Note that in the pipe-shaped member <NUM>, a portion projecting from the combustor casing <NUM> to the outside is referred to as an outside projecting portion 101e.

The outside projecting portion 101e is provided with the contact prevention mechanism 104E. Then, the heat-resistant glass <NUM> is disposed in the pipe-shaped member <NUM> on a side closer to the outside (laser light supply mechanism <NUM> side) than a position provided with the contact prevention mechanism 104E.

The contact prevention mechanism 104E prevents the combustion gas in the combustor liner <NUM> from coming into contact with the heat-resistant glass <NUM>. The contact prevention mechanism 104E includes the shutoff valve <NUM>.

The shutoff valve <NUM> is provided in a side portion of the outside projecting portion 101e. The shutoff valve <NUM> is disposed between a position provided with a flange 101c and a position provided with the heat-resistant glass <NUM> in an axial position of the pipe-shaped member <NUM>. Then, the shutoff valve <NUM> communicates or shuts off a space 240a on the heat-resistant glass <NUM> side in the pipe-shaped member <NUM> and a space 240b on the combustor liner <NUM> side in the pipe-shaped member <NUM>.

The shutoff valve <NUM> includes valve casings <NUM>, <NUM> and a shutoff portion <NUM>.

The valve casing <NUM> is constituted by a cylinder body having both ends thereof opened, or the like. As illustrated in <FIG>, one end 210a of the valve casing <NUM> is fitted in and joined to an opening 101d formed in a sidewall of the outside projecting portion 101e. The other end 210b of the valve casing <NUM> has a flange <NUM>, for example. Note that the valve casing <NUM> may be formed integrally with the outside projecting portion 101e.

The valve casing <NUM> is constituted by a cylinder body having both ends thereof opened, or the like. One end 220a of the valve casing <NUM> has a flange <NUM>, for example. One valve casing is constituted by fastening the flange <NUM> of the valve casing <NUM> and the flange <NUM> of the valve casing <NUM> with a bolt, for example.

The shutoff portion <NUM> shuts off space in the pipe-shaped member <NUM>. The shutoff portion <NUM> is provided to be movable forward and backward in the valve casings <NUM>, <NUM>. For example, in a state where the shutoff portion <NUM> is closed, namely a closed state, the space 240a and the space 240b are shut off. Here, in the closed state, the combustion gas flowing into the space 240b does not flow to the space 240a side.

A sealing member <NUM> such as packing is provided on an inner wall 220b of the valve casing <NUM>. The shutoff portion <NUM> moves while coming into contact with the sealing member <NUM>. Thus, the valve casing <NUM> and the shutoff portion <NUM> are sealed therebetween by the sealing member <NUM>.

As the shutoff valve <NUM>, for example, a needle valve, a ball valve, or the like can be used. Note that the shutoff valve <NUM> is not limited to these. As long as the shutoff valve <NUM> is a one which can shut off the space 240a and the space 240b when the shutoff portion <NUM> is closed, the one can be used.

Next, the operation of the combustor 20E is described.

Here, the operation of the contact prevention mechanism 104E is described.

At the time of ignition, the shutoff portion <NUM> is opened. Therefore, a laser light <NUM> oscillated by a laser oscillator 103a passes through a condensing lens 103b and the heat-resistant glass <NUM> to enter the pipe-shaped member <NUM>. The laser light <NUM> having passed through the interior of the pipe-shaped member <NUM> is focused on a focal point 110a in a predetermined region in the combustor liner <NUM>.

After confirming the ignition, the oscillation of the laser light <NUM> by the laser oscillator 103a is stopped, and at same time, the shutoff portion <NUM> is closed. This causes the space 240a and the space 240b to be shut off.

Therefore, the inflow to the heat-resistant glass <NUM> side of the combustion gas flowing into the pipe-shaped member <NUM> is blocked by the shutoff portion <NUM>. This causes impurities such as soot not to adhere to an inner surface 102a of the heat-resistant glass <NUM>.

According to the combustor 20E of the fifth embodiment not forming part of the invention as described above, including the contact prevention mechanism 104E makes it possible to suppress the contact between the heat-resistant glass <NUM> included in the pipe-shaped member <NUM> of the ignition device 100E and the combustion gas. Therefore, the impurities such as soot do not adhere to the inner surface 102a of the heat-resistant glass <NUM>. This prevents the reduction in transmittance of the laser light <NUM> passing through the heat-resistant glass <NUM>, resulting in enabling stable ignition.

According to the embodiments described above, it becomes possible to prevent the impurities such as soot from adhering to the heat-resistant glass of the laser ignition device and to perform stable ignition.

Claim 1:
A gas turbine combustor (20A), comprising:
a casing (<NUM>);
a combustion cylinder (<NUM>) which is provided in the casing (<NUM>) and combusts a fuel and an oxidant to produce a combustion gas;
a pipe-shaped member (<NUM>) having an open inner end portion (101a) and an open outer end portion (101b) to penetrate the casing (<NUM>) and the combustion cylinder (<NUM>);
a heat-resistant glass (<NUM>) which is provided on the casing side in the pipe-shaped member (<NUM>) and closes the pipe-shaped member (<NUM>);
a laser light supply mechanism (<NUM>) which irradiates an interior of the combustion cylinder (<NUM>) through the heat-resistant glass (<NUM>) and an interior of the pipe-shaped member (<NUM>) with a laser light (<NUM>);
a contact prevention mechanism (104A), which uses a flow of a contact prevention fluid for preventing a combustion gas in the combustion cylinder (<NUM>) from coming into contact with the heat-resistant glass (<NUM>) via the open inner end portion (101a) of the pipe-shaped member (<NUM>);
a cylinder body (<NUM>) which demarcates a space between the casing (<NUM>) and the combustion cylinder (<NUM>);
wherein the pipe-shaped member (<NUM>) penetrates the cylinder body (<NUM>);
characterized in that the contact prevention mechanism (104A) comprises:
a first fluid supply part which supplies a first fluid between the cylinder body (<NUM>) and the combustion cylinder (<NUM>); and
an ejection part (<NUM>), which is formed in the pipe-shaped member (<NUM>) located between the cylinder body (<NUM>) and the combustion cylinder (<NUM>), wherein the ejection part (<NUM>) has a plurality of ejection holes (<NUM>) formed in a circumferential direction of the pipe-shaped member (<NUM>) and ejects the first fluid through the ejection holes (<NUM>) into the pipe-shaped member (<NUM>).