Powder-material Flying Melting Furnace Having Dual Regenerative Chambers

The present invention provides a powder-material flying melting furnace having dual regenerative chambers, which can be widely used in the fields of glass production, iron-making, non-ferrous metal smelting and solid fuel gasification. In the powder-material flying melting furnace having dual regenerative chambers of the present invention, a blow gas inlet is provided in a common feed pipeline or a raw material feeding pipeline, a forced feeding equipment is arranged on the feed inlets, and the raw material feeding pipeline is configured to be a movable feeding pipeline, such that the melts can be effectively prevented from being condensed and bonded on the inner walls of the feeding inlets.

FIELD OF THE INVENTION

The present invention generally relates to the field of chemical industry and, more particularly, relates to powder-material flying melting furnace having dual regenerative chambers for melting powder raw material (or ash content of powder solid fuel) at high temperature under the flight state, which can be widely used in glass production, iron making, non-ferrous metal smelting, solid fuel gasification and so on.

BACKGROUND OF THE INVENTION

In the production of glass, iron, non-ferrous metal, and gasification of solid fuels, reactions need to be carried out in high-temperature furnaces. The powder raw material (or powder solid fuel) is dispersed in high temperature gas for high temperature reaction. Therefore, the heat and mass transfer speed is very fast, which can reduce energy consumption and production cost.

U.S. Pat. No. 8,747,524B2 discloses a furnace, in which powder raw materials such as glass, iron, non-ferrous metal and solid fuels can react at high temperatures in flight and the waste heat generated by the reaction can be recovered, The furnace requires two regenerative chambers to be used alternately to preheat the oxygen-containing gas and cool the high-temperature gas product. However, with two furnaces feeding in turn, the molten material often condenses and adheres on the inner wall of the two furnaces, blocking the feed inlet, thereby affecting the smooth feeding of raw materials. When the feed is not smooth, the feed quantity will reduce and the output will reduce, thereby affecting the stability of the working condition of the furnace. Serious blocking will lead to failure of feeding and the furnace needs to be stopped for exam and repair, which will cause great economic losses.

SUMMARY OF THE INVENTION

In order to solve the above problems, after careful study, the inventor of the present invention found that: the regenerative chambers used need to change direction once every period of time, and each direction change makes the direction of the gas flow in the melting furnace and the regenerative chamber into a direction opposite to the direction before the change. The two regenerative chambers can be used for preheating the oxygen gas and cooling the high-temperature gas products in turn respectively, and the two melting furnaces need to feed in turn. The melting furnace in communication with the regenerative chamber for preheating oxygen-containing gas is in a feeding state. In the hearth of the melting furnace, a fuel (in the case of gasification of a solid fuel, which is a powder solid fuel that is fed into the melting furnace from a feed inlet and is indicated in all the parentheses in the following paragraphs for gasification of a solid fuel) is rapidly mixed with a preheated gas containing oxygen, to reach a temperature above the melting temperature of powder raw material (or ash content of powdered solid fuel), usually more than 1450° C. required for the production of glass, iron-making and gasification of solid fuel, more than 1350° C. for flash copper smelting of copper concentrate.

The powder raw material (or powder solid fuel) dispersed in the high temperature gas is in the flight state. The heat and mass transfer efficiency is very high. The powder raw material (or ash content in the powder solid fuel) melts into the liquid melting dust rapidly. The liquid molten dust in the hearth brush the inner wall of the melting furnace along with the flow of high-temperature gas, most of the liquid molten dust will adhere to the furnace wall. Under the action of gravity, liquid molten dust flow down to the outlet near the bottom of the melting furnace. Although a small amount of molten dust is carried in the high-temperature gas output from the exhaust port of the melting furnace, it will then go into the second melting furnace, which is in a stop-feeding state. A small amount of molten dust carried by the high-temperature gas will adhere to the wall of the second melting furnace for purification and separation. The purified high-temperature gas will be imported into the regenerative chamber for cooling the high-temperature gas products to recover heat. As the powder raw material (or powder solid fuel) enters a melting furnace connected to a regenerative chamber for preheating oxygen-containing gases, a small amount of it will stick to the inner wall of the feed inlet of the melting furnace, the feed inlet of the melting furnace stops feeding. The high temperature gas enter the melting furnace from the other melting furnace will heat up the inner wall of the feed inlet of the furnace, the powder raw material adhered to the inner wall of the feed inlet (or ash content contained in the powder solid fuel) is heated, melted and bonded to the inner wall of the feed inlet. When the feed inlet resumes feeding after changing direction again, the new incoming powder raw material (or powder solid fuel) will adhere to the bonded melt on the inner wall of the feed inlet and reduce the temperature of the inner wall of the feed inlet, causing the bonded melt to cool and solidify. Therefore, in the case of repeated reversing, repeatedly bonding solidification will occur, the adhesive accumulate continuously, thereby resulting in blocking.

In order to solve the above problems, the present invention provides a first powder-material flying melting furnace having dual regenerative chambers, which includes two melting furnaces, raw material feeding equipment and oxygen-containing gas preheating system The oxygen-containing gas preheating system includes two regenerative chambers, two inlet reversing gates, two outlet reversing gates, an oxygen-containing gas input equipment and an exhaust equipment. One of the two regenerative chambers is used for preheating the oxygen-containing gas, and the other regenerative chamber is used for cooling the high-temperature gas product. The regenerative chamber for preheating the oxygen-containing gas includes a gas inlet and a preheat gas outlet. The regenerative chamber for cooling the high-temperature gas product has a high-temperature gas inlet and a cooling gas outlet.

According to one aspect of the present invention, the components included in the oxygen-containing gas preheating system are connected in a manner as following: the oxygen-containing gas input equipment is in communication with the gas inlet through an inlet reversing gate in an open state, and is in communication with the cooling gas outlet via an inlet reversing gate in a closed state. The exhaust equipment is in communication with the cooling gas outlet via an exhaust reversing gate in an open state, and is in communication with the gas inlet via an exhaust reversing gate in a closed state.

According to one aspect of the present invention, the melting furnace includes a feeding reversing gate, a raw material feeding pipeline, an air inlet, an air outlet, and a feed inlet, wherein the raw material feeding pipeline of the melting furnace includes an outlet end and an inlet end, the outlet end is in communication with the feed inlet of the melting furnace, and the inlet end is in communication with the feeding reversing gate of the melting furnace. The feeding reversing gates of the two melting furnaces are respectively in communication with the raw material feeding equipment through a common feed pipeline. The preheating gas outlet is in communication with an air inlet of a melting furnace, and the feeding reversing gate of the melting furnace is in an open state. The air outlet of the melting furnace is in communication with the air inlet of the other melting furnace via an airflow passage. The feeding reversing gate of the other melting furnace is in a closed state, and the air outlet of the other melting furnace is communicated with a high-temperature gas inlet. The common feed pipeline is provided with a blow gas inlet.

Compared with the prior art, the blow gas in the above technical solution plays a purging role on the inner wall of the feed inlet to prevent the powder raw material from adhering to the inner wall of the feed inlet, so that the molten material cannot be bonded and the blocking can be avoided.

The inventor of the present invention found that, under ideal conditions, the molten dust carried by the high-temperature gas is purified and separated by the hearth of the two melting furnaces, and the high-temperature gas will be very clean and then be put into the regenerative chambers for cooling the high-temperature gas products to recover the heat. In this case, using the above technical solution can solve the problem of the blocking of the feed inlet. However, sometimes, the molten dust cannot be separated completely, and there is a very small amount of molten dust difficult to be separated completely, this part of molten dust will fly into the feed inlet of the second furnace in the stop feeding state and stick to the inner wall of the inlet. After long time accumulation, the feed inlet may still be blocked.

In order to solve the above problems, the present invention provides a second powder-material flying melting furnace having dual regenerative chambers, which includes two melting furnaces and an oxygen-containing gas preheating system. The components of the oxygen-containing gas preheating system in second powder-material flying melting furnace having dual regenerative chambers are almost the same as those in first powder-material flying melting furnace having dual regenerative chambers, except that:

The melting furnace includes a raw material feeding equipment, an air inlet, an air outlet, a feed inlet and a raw material feeding pipeline, wherein the raw material feeding pipeline of the melting furnace includes an outlet end and an inlet end, the outlet end is in communication with the feed inlet of the melting furnace, the inlet end is in communication with the raw material feeding equipment. The preheating gas outlet is in communication with the air inlet of one melting furnace, the raw material feeding equipment of the melting furnace is in the start-up feeding state. The air outlet of the melting furnace is in communication with the air inlet of another melting furnace through a gasflow passage, and the raw material feeding equipment of the other melting furnace is in the stop feeding state, an air outlet of the other melting furnace is in communication with a high-temperature gas inlet. A blow gas inlet is arranged on the raw material feeding pipeline.

Since a blow gas inlet is arranged on the raw material feeding pipelines of the two melting furnaces, when the raw material feeding equipment of the other melting furnace is in a stop feed state, a blow gas is also fed into the melting furnace from the feed inlet of the melting furnace, preventing the high-temperature melting dust which cannot be completely purified by the melting furnace from flying into the feed inlet, thereby preventing the high-temperature melting dust from sticking on the inner wall of the feed inlet and causing blocking, and cooling the inner wall of the feed inlet, avoid inner wall of the feed inlet heating up to the melting temperature of powder raw material (or ash contained in powdered solid fuel).

In order to solve the above problems, the present invention provides a third powder-material flying melting furnace having dual regenerative chambers, which includes two melting furnaces and an oxygen-containing gas preheating system. The components of the oxygen-containing gas preheating system in third powder-material flying melting furnace having dual regenerative chambers are almost the same as those in first fourth powder-material flying melting furnace having dual regenerative chambers, except that:

The melting furnace includes a raw material feeding equipment, an air inlet, an air outlet, a feed inlet and a raw material feeding pipeline. The raw material feeding pipeline of the melting furnace includes an outlet end and an inlet end, the outlet end is in communication with the feed inlet of the melting furnace, and the inlet end is in communication with the raw material feeding equipment of the melting furnace. The preheating gas outlet is in communication with the air inlet of the melting furnace, and the raw material feeding equipment of the melting furnace is in the start-up feeding state. The air outlet of the melting furnace is in communication with the air inlet of another melting furnace through a gasflow passage, and the raw material feeding equipment of the other melting furnace is in a stop feeding state, an air outlet of the other melting furnace is communication with a high-temperature gas inlet. The feed inlet is provided with a forced feeding equipment which pushes the powdery raw material into the feed inlet via a mechanical thrust from the raw material feeding pipeline.

In order to solve the above problems, the present invention provides a fourth powder-material flying melting furnace having dual regenerative chambers, which includes two melting furnaces and an oxygen-containing gas preheating system. The components of the oxygen-containing gas preheating system in fourth powder-material flying melting furnace having dual regenerative chambers are almost the same as those in first powder-material flying melting furnace having dual regenerative chambers, except that:

The melting furnace includes a raw material feeding equipment, a raw material feeding pipeline, an air inlet, an air outlet and a feed inlet. The raw material feeding pipeline is a movable feeding pipeline, and the outlet end of the movable feeding pipeline is flexibly connected to the feeding inlet. The preheating gas outlet is in communication with an air inlet of one melting furnace, and the feed inlet of the melting furnace is in communication with a raw material feeding equipment through the movable feeding pipeline. The air outlet of the melting furnace is in communication with the air inlet of the other melting furnace through a gas flow passage, and the air outlet of the other melting furnace is in communication with the high-temperature gas inlet. The feed inlet of the other melting furnace and the outlet end of the movable feeding pipe are in a disconnected connection state.

DETAILED DESCRIPTION OF THE INVENTION

First Embodiment of the Present Invention

Referring toFIGS.1to3, the powder-material flying melting furnace having dual regenerative chambers of the present invention includes two furnaces, a raw material feeding equipment1and an oxygen-containing gas preheating system. The oxygen-containing gas preheating system includes two regenerative chambers3, two inlet reversing gates4, two exhaust reversing gates5, an oxygen-containing gas input equipment6and an exhaust device7. One of the two regenerative chambers3is used for preheating the oxygen-containing gas and the other regenerative chamber3is used for cooling the high-temperature gas product. The regenerative chamber3for preheating the oxygen-containing gas has a gas inlet18and a preheating gas outlet19. The regenerative chamber3for cooling the high-temperature gas product has a high-temperature gas inlet20and a cooling gas outlet21.

The components of the oxygen-containing gas preheating system are connected in the following manner the oxygen-containing gas input equipment6is communicated with the gas inlet18via an inlet reversing gate4in an opening state (the inlet reversing gate4on the right side ofFIG.1), and is communicated with the; cooling gas outlet21via the other inlet reversing gate4(the inlet reversing gate4on the left side ofFIG.1) in a closed state. The exhaust equipment7is communicated with the cooling gas outlet21via an exhaust reversing gate5in an opening state (the exhaust reversing gate5on the left ofFIG.1), and is communicated with the gas inlet18via the other exhaust reversing gate5in a closed state (the exhaust reversing gate5on the right side ofFIG.1).

Referring particularly toFIGS.2and3, the furnace includes a feed reversing gate8, a raw material feed pipeline9, an air inlet10, an air outlet12, and a feed inlet13. The raw material feed pipeline9of the furnace includes an outlet end15and an inlet end16, wherein the outlet end15is communicated with the inlet end13of the furnace, and the inlet end16is communicated with the feed reversing gate8of the furnace. The feed reversing gates8of the two furnaces are communicated with the raw material feeding equipment1via a common feed pipeline17, respectively. The preheat gas outlet19is communicated with the air inlet10of one furnace, the feeding reversing gate8of the furnace (the feeding reversing gate8on the right ofFIG.2) is in an open state, and the air outlet12of the furnace is communicated with the air inlet10of the other furnace via an airflow passage22. The feed reversing gate8of the other furnace (the feed reversing gate8on the left ofFIG.2) is in a closed state, and the air outlet12of the other furnace is communicated with the high temperature gas inlet20. A blow gas inlet23is arranged on the common feed pipeline17.

The inlet reversing gate4and the exhaust reversing gate5are used for the reverse operation, where one inlet reversing gate4and one exhaust reversing gate5are in an open state, the other inlet reversing gate4and the other exhaust reversing gate5are in a closed state. At regular intervals, the inlet reversing gate4and the exhaust reversing gate5reverse once. The inlet reversing gate4and the exhaust reversing gate5, which are in the open state before the reverse, are in the closed state after the reverse. The inlet reversing gates4and exhaust reversing gates5in the closed state before reversing are in the open state after reversing. The feeding reversing gate8in the open state before reversing is in the closed state after reversing, the feeding reversing gate8in the closed state before the reversing is in an open state after the reversing. The reverse operation is generally carried out every 10-60 minutes.

Compared with the prior art, in the first embodiment of the present invention, because a blow gas inlet23is arranged on a common feed pipeline17, the blow gas will be mixed with the powder raw material input from the raw material feeding equipment1and further fed to the hearth11via the feeding reversing gate8in an open state and the raw material feeding pipeline9, the feed inlet13in communication with the feeding reversing gate8in turn. The blow gas plays a purging role on the inner wall29of the feed inlet13to prevent the powdery raw material from adhering to the inner wall29of the feed inlet13. After the feeding reversing gate8in communication with the raw material feeding pipeline9is reversed and closed, the raw material feeding pipeline9has no raw material and blow gas feed into the furnace11(as shown inFIG.3), the high-temperature gas in the hearth11makes the temperature at inner wall29of the feed inlet13above the melting temperature of the powder raw material (or ash content of the powdered solid fuel), but because of the purging action, no powder raw material is adhered to the inner wall29of the feed inlet13, and no molten material is formed to avoid blockage.

Second Embodiment of the Present Invention

Referring toFIGS.1and4, in a second embodiment of the present invention, the region represented by the dotted circle24inFIG.1is replaced by the region represented by the dotted circle26inFIG.4, to form a powder-material flying melting furnace having dual regenerative chambers. The structure of the second embodiment is basically the same as that of the first embodiment. The difference between the first embodiment and the second embodiment lies that, in the second embodiment of the present invention, a blow gas inlet23arranged on a common feed pipeline17is in communication with a blow gas input line27, and a valve28is arranged on the blow gas input line27.

Third Embodiment of the Present Invention

Referring toFIGS.5and6, the powder-material flying melting furnace having dual regenerative chambers according to the third embodiment of the present invention includes two furnaces and an oxygen-containing gas preheating system identical to the first embodiment of the present invention. The difference between the first embodiment and the third embodiment of the present invention lies in that:

In the third embodiment of the present invention, the furnace includes a raw material feeding equipment1, an air inlet10, an air outlet12, a feed inlet13and a raw material feeding pipeline9. The raw material feeding pipeline9of the furnace includes an outlet end15and an inlet end16. The outlet end15is in communication with the feed inlet13. The inlet end16is communicated with the raw material feeding equipment1of the furnace The preheat gas outlet19is in communication with an air inlet10of a furnace, and the raw material feeding equipment1of the furnace is in a start-up feeding state, the air outlet12of the furnace is in communication with the air inlet10of another furnace via the airflow passage22. The raw material feeding equipment1of the other furnace is in a stopped feeding state, the air outlet12of the other furnace is in communication with a high temperature gas inlet20. The raw material feeding pipeline9is provided with a blow gas inlet23.

Fourth Embodiment of the Present Invention

Referring toFIGS.5and7, in a fourth embodiment of the present invention, the region represented by the dotted circle30inFIG.5is replaced by the region represented by the dotted circle31inFIG.7, to form a powder-material flying melting furnace having dual regenerative chambers. The structure of the fourth embodiment of the present invention is almost the same as that of the third embodiment of the present invention. The difference between the third embodiment and the fourth embodiment of the present invention lies in that: a blow gas input line27is in communication with the blow gas inlet and a valve28is arranged on the blow gas input line27.

The valve28mounted on the blow gas input line27can be used to open or close the blow air and adjust the blow air dosage to a more appropriate dosage, to avoid the inner wall29of the feed inlet13cannot be swept clean when the dosage is too low, and to avoid the waste of the blow air when the blow air dosage is too high. If the blow gas is not preheated, the temperature of the blow gas is relatively low, and the temperature of the furnace can be lowered if the blow gas dosage is too high.

The stopped feed inlet13does not require a large airflow speed to prevent molten dust from flying in, and the blow gas volume can be reduced by the valve28. A feeding feed inlet13does not need to be continuously fed with blow air, only needs to open valve28before reversing to clean the powder adhered on the inner wall29of the feeding inlet13, generally closing the valve28after blowing 3-5 seconds. For the second embodiment of the present invention, the valve28is also required to be opened after reversing, and the feed inlet13, which is about to start feeding, is purged, so that the inner wall29is cooled below the melting temperature of the powdered raw material (or ash content of the powdered solid fuel), and then the raw material feeding equipment1is started to feed, in order to prevent the new powder material from melt bonding on the inner wall29in the state of high temperature. Generally, the valve28can be closed after 5-10 seconds blowing. In order to reduce the amount of blow gas used in the production of glass using the above-mentioned technical solution, the operator has been using the above-mentioned operation and has not continuously input the blow gas to the feeding feed inlet13. However, test finds that when the valve28cannot be closed due to failure, the blow gas can be continuously input to the feeding fee inlet13. In this case, two days of production is carried out. In the production statistics report, it is found that in the two days, the pass rate of the glass products than the increased by 2.7%. After two months of repeated comparative experiments, it was found that, compared with the above operation manner, due to the continuous input of blow gas into the feeding raw material feeding pipeline9, the pass rate of the glass products can be increased by 3.6%.

According to experimental comparison, in comparison with the above-mentioned operation manner, when the technical solution of the above-mentioned embodiment is used for iron-making, copper-making or solid fuel gasification, if a blow gas is continuously inputted into the feed inlet13, the consumption of the raw materials can be reduced as following.

In iron-making, the amount of iron-making raw materials consumed per ton of iron produced can be reduced by 3.2%;

In copper-making, the amount of copper-making raw material consumed per ton of copper produced can be reduced by 2.7%;

In solid fuel gasification, the amount of solid fuel consumed per cubic meter of gas produced can be reduced by 2.6%.

After careful study, it was found that, because of the viscous nature of the powder raw material, if no blow gas is inputted into the feed inlet13, some powder agglomeration exists in the powder raw material inputted into the furnace from the feed inlet13. When the lumpy powder enters the furnace, some of the lumpy powder cannot be dispersed by the high temperature airflow in the furnace in time, and the surface layer of the powder pellets rapidly melts, forming powder pellets wrapped by a layer of molten liquid. It is more difficult to blow away the powder pellets wrapped in the molten liquid in the gas flow in the furnace. The reaction rate of mass transfer and heat transfer between the powder inside the powder pellets and the high-temperature gas flow outside is very slow, resulting in the following disadvantages:

In the production of glass, the powder raw material is usually a powder glass raw material. The powder in the glass raw material powder pellet wrapped by the molten liquid cannot melt fully in time, and becomes a kind of pellets that cannot melt fully discharged from the melting furnace. In the finished products such as flat glass or bottle glass, the pellets that cannot melt fully form inclusion defects in the glass product and lead to an unqualified product.

In iron-making, the powder raw material includes an iron ore powder, a powder flux mineral (usually presented as limestone). The high-temperature gas in hearth11is a high-temperature reductive gas containing CO and H2. The powder raw material is fully dispersed in the high-temperature reductive gas, and the heat and mass transfer efficiency is very high. The powder raw material will rapidly melt into a liquid state and reduce the precipitated liquid iron and the slag in melted state, which will be discharged from the drain outlet2. However, the reaction rate of the iron ore powder in the powder pellet wrapped by the molten liquid and the high-temperature reductive gas outside is very slow. The iron contained in the powder pellet cannot be fully reduced and extracted in time and becomes a slag to be discharged out of furnace;

In copper-making, the powder raw material includes copper sulfide concentrate powder and a powder flux. When the powder raw material is fully dispersed in the high temperature gas in the hearth, it only takes 2-3 seconds for the reaction of oxidation desulphurization, melting and slagging to form copper matte and slag, which can be discharged from the drain outlet2. However, the reaction rate of the copper sulphide concentrate in the powder pellets wrapped by molten liquid and the outside high temperature gas is very slow, and there is no enough reaction time to form copper matte is formed before the copper sulphide concentrate becoming the slag and discharged from the drain outlet2;

In solid fuel gasification, the powder raw material (or powder solid fuel) typically includes pulverized coal and powder biomass fuel. The ash contained in the surface layer of the undispersed solid fuel powder pellets rapidly melts in a high-temperature hearth, forming a powder pellet wrapped by a layer of molten liquid, the solid fuel in the powder pellet cannot be fully gasified into high-temperature gas in time before being discharged from the furnace along with the melted ash.

If a blow gas is continuously fed into the feed inlet13, when the blow gas enters the raw material feeding pipeline9, it will impact and blow away the powder pellets, so that the powder material is fully dispersed in the high-temperature gas flow in the furnace. The fine powder particles are in full contact with the high temperature airflow, and the heat and mass transfer speed is very fast. The above-mentioned production of glass, iron, copper or solid fuel gasification, can obtain the following more adequate reaction respectively:

During the production of glass, the fine glass powder particles can fully contact with the high-temperature air flow and can fully carry out the melting reaction to form qualified glass liquid, thereby avoiding the inclusion defects caused by the agglomeration of the powder and improving the product pass rate;

During iron-making, the fine iron-making powder particles are in full contact with the high-temperature reductive air flow, and the reaction speed is very fast, to fully reduce and extract the iron in the raw material and avoid the raw material waste caused by powder agglomeration;

During copper-making, the fine copper powder particles are in full contact with the high-temperature air flow, and the reaction speed is very fast. The copper sulfide concentrate can carry out the reaction of oxidation desulphurization, melting and slagging, so that the copper contained in the copper sulphide concentrate can be fully converted into copper matte, to prevent it from becoming slag and causing waste of raw materials;

During solid fuel gasification, the fine powder solid fuel particles are in full contact with the high temperature oxygen-containing gas, the reaction speed is very fast, the high temperature gas containing CO and H2can be fully gasified, and the fuel waste caused by the agglomeration of powdered solid fuel is avoided.

In view of the foregoing, by continuously inputting blow gas into the feeding feed inlet13, the powder raw material can be fully dispersed in the high-temperature gas flow in the furnace, and the high-temperature reaction is more sufficient, thereby obtaining unexpected technical effects. Therefore, preferably, the present invention continuously inputs a blow gas into a feed inlet13being fed.

In the above embodiments, the blow gas can be input by connecting a blow gas input device on a blow gas inlet23, and the blow gas can use oxygen-containing gas or nitrogen gas, wherein the oxygen-containing gas includes air or oxygen-enriched air.

Using air as blow gas is relatively easy to obtain by connecting a blower to the blow gas inlet23or using a compressed air input. If the furnace pressure in hearth11is controlled to an appropriate negative pressure value (equivalent to the pressure in hearth11being less than the external pressure and having an appropriate pressure difference), a hole defined in the raw material feeding pipeline9or common feed pipeline17can be used as a blow air input equipment drawing in outside air and acting as blow air.

When the third or fourth embodiment is used for iron-making, an oxygen-containing gas is used as the blow gas, the high-temperature reductive waste gas can also be mixed with the blow gas before being fed into the regenerative chamber3for cooling the high-temperature gas products. In the fourth embodiment, only the valve28on the blow gas input line27needs to be adjusted to an appropriate oxygen-containing gas input quantity to enable the high-temperature reductive exhaust gas to burn fully, therefore, the chemical energy of the high-temperature reductive waste gas can be fully utilized.

Fifth Embodiment of the Present Invention

Referring toFIGS.8to10, the fifth embodiment of the powder-material flying melting furnace having dual regenerative chambers of the present invention includes two furnaces and an oxygen-containing gas preheating system identical to the first embodiment of the present invention. The difference between the first and fifth embodiment of the present invention lies in that:

The furnace includes a raw material feeding equipment1, an air inlet10, an air outlet12, a feed inlet13and a raw material feeding pipeline9. The raw material feeding pipeline9of the furnace includes an outlet end15and an inlet end16, the outlet end15is in communication with the feed inlet13of the furnace, and the inlet end16is in communication with the raw material feeding equipment1of the furnace. The preheat gas outlet19is in communication with the air inlet10of a furnace, the raw material feeding equipment1of the furnace is in the start-up feeding state, the air outlet12of the furnace is in communication with the air inlet10of another furnace through the airflow passage22, and the raw material feeding equipment1of the other furnace is in the stop feeding state, the air outlet12of the other furnace is in communication with the high-temperature gas inlet20. A forced feeding equipment is arranged on the feed Inlet13.

The forced feeding equipment includes a push rod35, a rod receiving chamber36, a piston37, and a driving mechanism38for reciprocating movement of the piston37. The rod receiving chamber36is in communication with an inlet end16of the raw material feeding pipeline9. The outer diameter of the push rod35corresponds to the inner diameter of the raw material feeding pipeline9. The push rod35includes a tail end39and a top end40. The tail end39of the push rod35connects the piston37. The top end40of the push rod35is pushed by the piston37to the retraction end point position of the reciprocating motion and retreats into the rod receiving chamber36(shown inFIG.10), and reaches the feed inlet13when the top end40reaching at the position of the thrust end of the reciprocating motion (as shown inFIG.9). The tail end39of the push rod35is pushed by the piston37to be received in the rod receiving chamber36when the tail end arriving at the thrust end of the reciprocating motion.

The above-mentioned forced feeding equipment is an equipment for pushing the powdery raw material from the raw material feeding pipeline9into the feed inlet13by mechanical driving force. The push rod35can carry out continuous reciprocating movement, forcing the powdery raw material from the inlet end16into the raw material feeding pipeline9into the feed inlet13.

When the inner wall29of the feed inlet13has molten material, the molten material will be condensed and adhere to the inner wall29. After the condensation, the bond strength is very high and the condensed material is difficult to remove, which may cause clogging due to continuous accumulation. The push rod35may continuously and forcibly push the powdery raw material and the molten material together from the feed inlet13into the hearth11, and may promptly remove a small amount of the molten material adhered to the inner wall29, so as to avoid the problem that the molten matter is difficult to remove and cause clogging after condensing and bonding.

Sixth Embodiment of the Present Invention

Referring toFIGS.5and11, the area indicated by the dotted circle30inFIG.5is replaced by the area indicated by the dotted circle70inFIG.11, to form a powder-material flying melting furnace having dual regenerative chambers. The sixth embodiment is almost the same as the fifth embodiment, and the only difference between the sixth embodiment and the fifth embodiment lies in that the forced feeding equipment in the sixth embodiment is different from the forced feeding equipment in the fifth embodiment. The forced feeding device of the sixth embodiment includes a spring-shaped helical blade67and a mechanically driven rotating shaft68. The helical blade67is located in the raw material feeding pipeline9, the rotating shaft68is positioned on the center line of the helical blade67, and the rotating shaft68is fixedly connected with the helical blade67.

The rotating shaft68is driven by a motor69, and the rotating shaft68is connected with a motor69.

The above-mentioned forced feeding equipment is also an equipment for pushing the powdery raw material from the raw material feed pipeline9into the feed inlet13by mechanical drive. The rotation direction of the rotating shaft68causes the helical blade67to push the powdery raw material towards the feed inlet13. When there is molten material on the inner wall29of the feed inlet13, the powder raw material and the molten material are forced into the hearth11by the helical blade67to avoid blockage.

Seventh Embodiment of the Present Invention

Referring toFIGS.8,12and13, the areas shown by dotted circles41and42inFIG.8are replaced by the areas shown by dotted circles53and54inFIGS.12and13, respectively, to form a powder-material flying melting furnace having dual regenerative chambers including two furnaces and an oxygen gas preheating system in the same manner as the first embodiment. The difference between the first embodiment and the seventh embodiment lies in that:

The furnace includes a raw material feeding equipment1, a raw material feeding pipeline, an air inlet10, an air outlet12and a feed inlet13, wherein the raw material feeding pipeline is moveable feeding pipeline43. The outlet end44of the movable feeding pipeline43is movably connected with the feed inlet13. The preheat gas outlet19is in communication with the air inlet10of a furnace, a feed inlet13of the furnace is in communication with a raw material feeding equipment1via a movable feeding pipeline43, and an air outlet12of the furnace is in communication with an airflow passage22and an air inlet10of another furnace. An air outlet12of the other furnace is in communication with a high-temperature gas inlet20. The feed inlet13of the other furnace is disconnected from the outlet end44of the movable feeding pipeline43.

The movable feeding pipeline43includes a fixed pipeline47, a movable pipeline46, a gate plate48, a piston49and a driving mechanism50for reciprocating movement of the piston49. The fixed pipeline47includes an inlet end45and an outlet52. The inlet end45is in communication with a raw material feeding equipment1. The movable pipeline46includes an inlet51, an outlet end44, and the gate plate48is fixedly connected to the outside of the inlet51of the movable pipeline46. The piston49is connected with the movable pipeline46. When the movable pipeline46is pushed to the position of the propulsion end point of the reciprocating movement by the piston49, the outlet end44is in communication with the feed inlet13(as shown inFIG.13), and the inlet51is in communication with the outlet52. When the movable pipeline46is driven by the piston49to the retraction end point position of the reciprocating motion, the outlet end44is disconnected from the feed inlet13(as shown inFIG.12), the inlet51is disconnected from the outlet52, and the gate plate48covers the outlet52.

It is difficult to know the specific degree of blocking if the feed inlet13is connected with the raw material feeding pipeline9. In this embodiment, the operator may disconnect the stopped feed inlet13from the movable feeding tube43at any time, to see if there is a molten condensation bond on the inner wall29of the feed inlet13, to facilitate the operation of workers with electric drill, brush or grinding wheel and other conventional tools to clean the inner wall29of the bonded material, and avoid blockage caused by more and more of the bonded material. After disconnecting, the feed inlet13is in communication with the outside, which will cause the heat loss of the furnace and the high-temperature gas leakage. When the pressure in the furnace is greater than the outside pressure, the high temperature gas in the furnace will leak. Therefore, when disconnecting, the furnace pressure should be adjusted to slightly lower than the external pressure.

Eighth Embodiment of the Present Invention

FIGS.14and15schematically represent a movable feeding pipeline and a gate. The region represented by the dotted circles41and42in8are replaced by the regions represented by the dotted circles65and66inFIGS.14and15respectively, to form a powder-material flying melting furnace having dual regenerative chambers. The eighth embodiment of the present invention has almost the same structure as that of the seventh embodiment of the present invention. The difference between the eighth and seventh embodiment of the present invention lies in that the feed inlet13is provided with a gate32and the movable feeding pipeline43has a different structure from that of the seventh embodiment.

Referring toFIGS.14and15, the movable feeding pipeline43includes an inner pipeline55, an outer pipeline56, an outlet end44, an inlet end45, a transverse arm57, a piston58and a driving mechanism59for reciprocating motion of the piston58. One end of the transverse arm57is connected with an outer pipeline56, and the other end of the transverse arm57is connected with a piston58. The outer pipeline56is sleeved on the inner pipeline55, and there is an oil seal60in the gap between the outer pipeline56and the inner pipeline55. When the outer pipeline56is pushed by the piston58and the transverse arm57to the push end position of the reciprocating motion, the outlet end44is disconnected from the feed port13and is away from the feed inlet13(as shown inFIG.14), the outlet end44is in communication with the feed inlet13when pushed to the retraction end position of the reciprocating motion by the piston58and the transverse arm57(as shown inFIG.15). The gate32includes a gate plate61, a transverse arm62, a piston63and a driving mechanism64for reciprocating motion the piston63. One end of the transverse arm62is connected with the gate plate61, and the other end of the transverse arm62is connected with a piston63. When the gate plate61is driven to the end of the reciprocating thrust by piston63and transverse arm62, the gate plate61covers the feed inlet13. The gate plate61leaves the feed inlet13when pushed by the piston63and the transverse arm62to the retractable end position of the reciprocating motion.

The gate plate32on the feed inlet13communicated with the movable feeding pipeline43is in an open state (as shown inFIG.15), so that the raw materials can enter the furnace smoothly. Gate32on the feed inlet13disconnected from the outlet44of movable feeding pipeline43is in a closed state (as shown inFIG.14), to prevent high temperature gas leakage from the furnace. The operator can conveniently open the gate32and close it after inspecting or cleaning the bonded material on the inner wall29of the feed inlet13.

In the above embodiment, the airflow passage22may be replaced by an adhesive separator disclosed in the U.S. Pat. No. 8,747,524 B2. The adhesive separator has an air inlet and an air outlet, the high-temperature gas carrying the molten dust can be imported from the air inlet, and the purified high-temperature gas can be exported from the air outlet. Therefore, the adhesive separator essentially has the function of allowing high-temperature air flow through, which is provided by the airflow passage22, and belongs to an airflow channel. The use of the adhesive separator is very simple and is illustrated by means of the ninth embodiment as following.

Ninth Embodiment of the Present Invention

Referring toFIGS.16and6(the enlarged views of the dotted circle30inFIGS.5and16are the same as shown inFIG.6), the ninth embodiment of the powder-material flying melting furnace having dual regenerative chambers of the present invention almost has the same structure as that of the third embodiment. The difference between the ninth embodiment and the third embodiment of the present invention lies in that: the airflow passage22in the third embodiment of the present invention is replaced by an adhesive separator represented by a dotted block71. The adhesive separator71inFIG.16includes an air inlet72and an air outlet73. The air inlet72is in communication with an air outlet12of one furnace, and the air outlet73is in communication with an air inlet10of another furnace.

InFIG.16, the adhesion separator71and the two furnaces form a series structure which can make the molten dust in the high-temperature gas purified more thoroughly, and avoid the molten dust entering the feed inlet in the stop feeding state, thereby playing the role of avoiding or reducing the blockage.

In the above embodiment, the exhaust equipment7may use an induced draft fan or a chimney (the chimney cannot be used when the solid fuel is gasified), and the oxygen-containing gas input equipment6may use a blower. Any value of furnace pressure from negative to positive can be controlled by adjusting the difference between the pumping force of exhaust equipment7and the pressure of oxygen-containing gas input equipment6. When the exhaust equipment7is an induced draft fan or a chimney, an air inlet can be set as an oxygen-containing gas input device6to input outside air. If an oxygen-containing gas input equipment6uses a blower, an exhaust port (in solid fuel gasification, the exhaust port into the exhaust pipe) can be used as exhaust equipment7to discharge gas (exhaust gas in fuel gasification, gas can be transported from the exhaust pipeline to the gas point).

The furnace also includes a hearth11and a furnace wall14, wherein the feed inlet13, the air inlet10and the air outlet12are arranged on the furnace wall14respectively. Raw material feeding equipment1is used for feeding powder material into the furnace via the feed inlet13. Raw material feeding equipment1can adopt equipment used for feeding powder material, such as impeller feeder and screw feeder. Other conventional equipment may also be used, provided that the powder material can be fed into the common feed pipeline17or the inlet end16of the raw material feeding pipeline9. The powder-material flying melting furnace having dual regenerative chambers also has drain outlet2. The drain outlet2is located at or near the bottom of the hearth11, and the molten dust adhered to the furnace wall14flows to the drain outlet2and output under the action of gravity. The hearth11has a shape of cylinder. The air Inlet10and the air outlet12are located near and tangentially connected to both ends of the cylindrical hearth11respectively, and the feed inlet13is substantially positioned at the top center of the cylindrical hearth11.

When the embodiment is used for producing glass, iron and copper, the oxygen-containing gas can use air or oxygen-enriched air, and the fuel can use powdered solid fuel, gaseous fuel or liquid fuel. If powder solid fuel or gaseous fuel is used, the powder solid fuel may be mixed in the powder raw material and fed into the furnace from the raw material feeding pipeline. A gas fuel inlet can be opened on the raw material feeding pipeline to input the gas fuel, which is very convenient. When the embodiment is used for iron-making, the powder solid fuel is usually pulverized coal.

When the embodiment is used for gasification of solid fuel, the oxygen-containing gas usually also contains a portion of water vapor. If the calorific value of the gas needs to be increased, a mixture of oxygen and water vapor may be used.

The above described embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement and improvement within the spirit and principle of the present invention should be included in the protection scope of the present invention.