JP2017095635A - Gasification device, gasification composite power generation unit, gasification facility and soot removal method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasification device suitably removing soot stuck to a heat exchanger and capable of suppressing the generation of black smoke upon the start of a gasification furnace.SOLUTION: Provided is a gasification device comprising: a gasification furnace 101 where carbon-containing solid fuel is fed to generate a generated gas, and further, the generated gas is circulated; a heat exchanger 102 provided at the inside of the gasification furnace 101, and performing heat exchange with the generated gas; and a soot removal apparatus 103 of jetting nitrogen toward the heat exchanger 102 in a state where a gas flow is present at the inside of the gasification furnace 101 in a period where the feed of the nitrogen-containing solid fuel to the gasification furnace 101 is stopped.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gasification device, a combined gasification power generation facility, a gasification facility, and a degassing method for generating a product gas by partially combusting a carbon-containing solid fuel such as coal and gasifying it.

  The gasifier supplies carbon-containing solid fuel such as coal as fuel into a gasifier, and generates combustible product gas from coal or the like in the gasifier. A heat exchanger for cooling the product gas is provided in the gasification furnace. The soot contained in the product gas adheres to this heat exchanger.

  In order to remove the soot adhering to the heat exchanger, the soot adhering to the heat transfer surface of a heat exchanger such as an exhaust gas economizer provided in the exhaust gas passage deteriorates the heat transfer characteristics. There has been known a hair removal device for removing the attached wrinkles (see, for example, Patent Document 1). The scissoring device described in Patent Document 1 includes a soot blower that injects an injection medium such as air or steam, and removes the soot adhering to the heat exchanger by injecting the injection medium into the heat exchanger. It is medium.

  Moreover, a stationary soot blower (suit blower) is known as a scissor removing device provided in the gasifier (see, for example, Patent Document 2). The stationary soot blower described in Patent Document 2 has a plurality of injection pipes that inject steam as an injection medium, and each of the injection pipes is filled with a sealing medium when no steam is injected. ing.

Japanese Utility Model Publication No. 63-116737 JP 2005-3266 A

  By the way, when removing the soot adhering to the heat exchanger, the degassing device provided in the gasifier is injecting steam toward the heat exchanger during operation in which fuel is supplied into the gasifier. The However, when the supply of fuel into the gasifier is stopped at the gasifier stop stage, it becomes difficult to secure the steam to be supplied to the degassing device. It becomes difficult to remove the soot adhering to the exchanger. Here, at the start-up stage of the gasification furnace, the atmosphere in the gasification furnace is grounded at the time of start-up until the gasification furnace is ignited and the gasification furnace is ignited and vented to the char recovery device. Distributes towards flare equipment. When the gasification furnace is started, if air is ventilated in the gasification furnace, a part of the soot adhering to the heat exchanger is scattered, and the scattered soot is supplied to the ground flare equipment. In this case, black smoke may be generated in the ground flare equipment.

  Therefore, the present invention suitably removes the soot adhering to the heat exchanger when the gasification furnace is stopped, and can suppress part of the soot from being scattered during the start-up stage of the gasification furnace. It is an object of the present invention to provide a gasification apparatus, a combined gasification power generation facility, a gasification facility, and a removal method.

  The gasifier of the present invention is supplied with a carbon-containing solid fuel to generate a product gas, and is provided in a gasification furnace in which the product gas circulates, and inside the gasification furnace. In a state where there is a gas flow inside the gasification furnace during a period when the supply of the carbon-containing solid fuel to the gasification furnace is stopped and the heat exchanger to be exchanged, toward the heat exchanger And a depigmenting device for injecting an inert gas.

  In addition, the gasification apparatus removing method according to the present invention includes a gasification furnace in which a product gas is generated by supplying a carbon-containing solid fuel, and a gasification furnace in which the product gas flows, and a gasification furnace provided in the gasification furnace. And a heat exchanger for exchanging heat with the product gas, wherein the supply of carbon-containing solid fuel to the gasification furnace is stopped and the pressure inside the gasification furnace is reduced. And injecting an inert gas toward the heat exchanger in a state where a gas flow exists inside the gasification furnace before the gasifier is started next time. To do.

  According to this configuration, the soot adhering to the heat exchanger is injected by injecting the inert gas from the removal device to the heat exchanger during the period when the supply of the carbon-containing solid fuel to the gasifier is stopped. Can be removed. At this time, even if it is difficult to secure the vapor, since the inert gas is used, it is possible to remove the heat exchanger. Therefore, since the soot adhering to the heat exchanger can be reduced, it is possible to suppress part of the soot from being scattered at the start-up stage of the gasification furnace, so that the soot is prevented from being supplied to the ground flare equipment. And the generation of black smoke from the ground flare equipment can be suppressed. In addition, as a period when a gas flow exists inside a gasification furnace, there exists a period when the pressure inside a gasification furnace falls.

  The degassing apparatus is connected to an inert gas supply system that supplies the inert gas and a steam supply system that supplies steam, and the demolition apparatus supplies the gasification furnace with the degassing apparatus. While the supply of carbon-containing solid fuel is stopped, while injecting the inert gas toward the heat exchanger, while supplying the carbon-containing solid fuel to the gasifier, It is preferable that the inert gas and the steam can be switched so as to inject the steam toward the heat exchanger.

  According to this configuration, during operation of the gasifier, the steam adhering to the heat exchanger can be removed by injecting the steam from the removal device to the heat exchanger. In addition, after the supply of fuel to the gasifier is stopped, soot adhering to the heat exchanger can be removed by injecting an inert gas from the removal device to the heat exchanger. As described above, the degassing apparatus can suitably remove the soot adhering to the heat exchanger by switching between the inert gas and the steam according to the operation state of the gasifier. Note that the degassing apparatus has a longer inert gas injection period for injecting the inert gas into the heat exchanger than the steam injection period for injecting the steam into the heat exchanger.

  Further, a depressurization period for depressurizing the inside of the gasification furnace is provided during a period in which the supply of the carbon-containing solid fuel is stopped, and the degassing apparatus injects the inert gas during the depressurization period. It is preferable.

  According to this configuration, since the gas flow is generated in the gasification furnace by reducing the pressure in the gasification furnace during the decompression period, the soot removed by the degassing device is generated by the generated gas flow. , Transported outside the gasifier. For this reason, it is possible to suppress the removed soot from reattaching to the heat exchanger.

  Further, during the period when the supply of the carbon-containing solid fuel is stopped, a depressurization period for depressurizing the inside of the gasification furnace, and an intermittent pressure for repeatedly varying the pressure in the gasification furnace after the depressurization period It is preferable that a purge period is provided, and the degassing apparatus injects the inert gas during the intermittent pressure purge period in addition to the decompression period.

  According to this configuration, the pressure inside the gasification furnace fluctuates up and down during the intermittent pressure purge period. When the pressure inside the gasifier decreases, a gas flow is generated in the gasifier, so that the soot removed by the degassing device is carried out of the gasifier by the generated gas flow. For this reason, it is possible to suppress the removed soot from reattaching to the heat exchanger.

  A plurality of the heat exchangers are provided side by side from the upstream side to the downstream side in the direction of flow of the product gas, and the degassing device is more upstream than the heat exchanger on the most downstream side. It is preferable to increase at least one of the injection pressure, the injection flow rate, and the injection period of the inert gas with respect to the heat exchanger.

  According to this configuration, the product gas has a higher temperature on the upstream side in the flow direction than on the downstream side, so that the soot adhering to the heat exchanger has a large adhesion force in the upstream heat exchanger. . For this reason, by increasing the removal force for the heat exchanger on the upstream side of the gas flow, the soot adhering to the upstream heat exchanger can be suitably removed by the removal device. The removal power is increased by increasing the injection pressure of the inert gas, increasing the injection amount of the inert gas, or extending the injection period of the inert gas.

  Further, a plurality of the heat exchangers are provided side by side from the upstream side to the downstream side in the flow direction of the product gas, and the demolding device is in order from the heat exchanger on the upstream side to the heat exchanger on the downstream side. It is preferable to start injection of the inert gas.

  According to this configuration, since the soot removed by the scissoring device can be suitably distributed from the upstream side to the downstream side of the gas flow, the soot can be suitably carried out of the gasification furnace, Residue of soot in the gasification furnace can be suppressed.

  Further, a plurality of the heat exchangers are provided side by side from the upstream side to the downstream side in the flow direction of the product gas, and the demolding device is in order from the heat exchanger on the upstream side to the heat exchanger on the downstream side. It is preferable to stop the injection of the inert gas.

  According to this configuration, since the soot removed by the scissoring device can be suitably distributed from the upstream side to the downstream side of the gas flow, the soot can be suitably carried out of the gasification furnace, Residue of soot in the gasification furnace can be suppressed.

  Further, a removal amount detecting unit for detecting the removal amount of the waste removed by the removal device is further provided, and a target removal amount to be removed by the removal device is set in advance, and the removal is performed. The apparatus preferably performs the inert gas injection operation so that the detected removal amount detected by the removal amount detection unit becomes the target removal amount.

  According to this configuration, when the detected removal amount detected by the removal amount detection unit becomes the target removal amount, it is possible to detect that the waste adhered to the heat exchanger has been appropriately removed. For this reason, since the injection quantity of an inert gas can be made into the injection quantity required and sufficient for removing, the consumption of an inert gas can be suppressed. The injection operation includes, for example, an inert gas injection pressure, an inert gas injection amount, an inert gas injection period, and an inert gas injection timing.

  The combined gasification power generation facility of the present invention is configured to burn the above gasification device that supplies a carbon-containing solid fuel to generate a product gas and at least a part of the product gas generated by the gasification device. A gas turbine that is rotationally driven, a steam turbine that is rotationally driven by steam generated by an exhaust heat recovery boiler that introduces turbine exhaust gas discharged from the gas turbine, and a generator connected to the gas turbine and the steam turbine. It is characterized by providing.

  According to this configuration, when the gasifier is started, the generation of black smoke is suppressed by suppressing part of the soot from being scattered, and the generated gas generated by the gasifier is supplied to the gas turbine. Then, the gas turbine and the steam turbine are rotationally driven to generate power by the generator.

  The gasification equipment of the present invention supplies the carbon-containing solid fuel to generate a product gas, and is contained in the gasification apparatus connected to the gasification apparatus and supplied from the gasification apparatus. And a char collection device for collecting the char to be collected.

  According to this configuration, at the start of the gasifier, the generation of black smoke can be suppressed by suppressing a part of the soot from being scattered, and the generated gas generated by the gasifier can be recovered from the char. The char contained in the product gas can be recovered by the char recovery device.

  ADVANTAGE OF THE INVENTION According to this invention, the soot adhering to a heat exchanger can be suitably removed at the stop stage of a gasification furnace, and it suppresses that a part of soot is scattered at the start-up stage of a gasification furnace. be able to.

FIG. 1 is a schematic configuration diagram of a combined coal gasification combined power generation facility to which a gasification apparatus according to Embodiment 1 is applied. FIG. 2 is a schematic configuration diagram illustrating the gasifier according to the first embodiment. FIG. 3 is an explanatory diagram for explaining the injection timing of nitrogen gas by the gasifier according to the first embodiment. FIG. 4 is an explanatory diagram for explaining the injection timing of nitrogen gas by the gasifier according to the second embodiment. FIG. 5 is a schematic configuration diagram illustrating a gasifier according to the third embodiment. FIG. 6 is a schematic configuration diagram illustrating a gasifier according to the fourth embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined, and when there are a plurality of embodiments, the embodiments can be combined.

[Embodiment 1]
FIG. 1 is a schematic configuration diagram of a combined coal gasification combined power generation facility to which a gasification apparatus according to Embodiment 1 is applied. FIG. 2 is a schematic configuration diagram illustrating the gasifier according to the first embodiment. FIG. 3 is an explanatory diagram for explaining the injection timing of nitrogen gas by the gasifier according to the first embodiment.

  An integrated coal gasification combined cycle (IGCC) 10 to which the gasifier 14 according to the first embodiment is applied uses air as an oxidant, and the gasifier 14 generates a gas from fuel. Adopting air combustion method to generate. And the coal gasification combined cycle power generation equipment 10 refine | purifies the product gas produced | generated by the gasification apparatus 14 with the gas refinement | purification apparatus 16 and makes it fuel gas, Then, it supplies to the gas turbine equipment 17 and is generating electric power. That is, the coal gasification combined power generation facility 10 of Embodiment 1 is an air combustion type (air blowing) power generation facility. As the fuel supplied to the gasifier 14, for example, a carbon-containing solid fuel such as coal is used.

  As shown in FIG. 1, the coal gasification combined power generation facility (gasification combined power generation facility) 10 includes a coal supply device 11, a gasification device 14, a char recovery device 15, a gas purification device 16, and a gas turbine facility. 17, a steam turbine facility 18, a generator 19, a heat recovery steam generator (HRSG) 20, and a ground flare facility 21.

  The coal feeder 11 is supplied with coal, which is a carbon-containing solid fuel as raw coal, and pulverizes with a coal mill (not shown) to produce pulverized coal pulverized into fine particles. The pulverized coal produced by the coal supply device 11 is supplied toward the gasifier 14 by nitrogen as a transfer inert gas supplied from an air separation device 42 described later. The inert gas is an inert gas having an oxygen content of about 5% by volume or less, and representative examples thereof include nitrogen gas, carbon dioxide gas, and argon gas, but are not necessarily limited to about 5% or less.

  The gasifier 14 is supplied with the pulverized coal produced by the coal feeder 11 and the char (unburned coal) recovered by the char recovery device 15 being returned to be reused. . A facility including at least the gasifier 14 and the char recovery device 15 can be configured as a gasifier 25.

  The gasifier 14 is connected to a compressed air supply line 41 from the gas turbine equipment 17 (compressor 61), and the compressed air compressed by the gas turbine equipment 17 can be supplied to the gasifier 14. It has become. The air separation device 42 separates and generates nitrogen and oxygen from air in the atmosphere, and the air separation device 42 and the gasifier 14 are connected by a first nitrogen supply line 43. The first nitrogen supply line 43 is connected to a coal supply line 11 a from the coal supply device 11. A second nitrogen supply line 45 that branches from the first nitrogen supply line 43 is also connected to the gasifier 14, and a char return line 46 from the char recovery device 15 is connected to the second nitrogen supply line 45. Has been. Further, the air separation device 42 is connected to the compressed air supply line 41 by an oxygen supply line 47. The nitrogen separated by the air separation device 42 is used as a coal and char transport gas by flowing through the first nitrogen supply line 43 and the second nitrogen supply line 45. The oxygen separated by the air separation device 42 is used as an oxidant in the gasifier 14 by flowing through the oxygen supply line 47 and the compressed air supply line 41.

  The gasifier 14 has, for example, a two-stage spouted bed type gasifier. The gasifier 14 partially combusts coal (pulverized coal) supplied to the inside with an oxidant (air, oxygen) to gasify it to generate a combustible gas. The gasifier 14 is provided with a foreign matter removing device 48 that removes foreign matter mixed in the pulverized coal. The gasifier 14 is not limited to a spouted bed gasifier, and may be a fluidized bed gasifier or a fixed bed gasifier. The gasifier 14 is connected to a gas generation line 49 for supplying a combustible gas toward the char recovery device 15 so that the combustible gas containing char can be discharged. In this case, by providing a gas cooler in the gas generation line 49, the combustible gas may be cooled to a predetermined temperature before being supplied to the char recovery device 15.

  A flare supply line 50 is connected to the gas generation line 49, and the flare supply line 50 is connected to the ground flare equipment 21. The ground flare facility 21 is a facility for burning unnecessary combustible gas, and is supplied with the internal atmospheric gas discharged from the gasifier 14 when the gasifier 14 is started. And the grand flare equipment 21 burns the combustible gas contained in the internal atmospheric gas supplied from the gasifier 14. As described above, when the gasifier 14 is started, the gas generation line 49 is switched to the flare supply line 50, while when the gasifier 14 is operated, the flare supply line 50 is switched to the gas generation line 49. It is done. That is, when the gasifier 14 is started up, the internal atmospheric gas discharged from the gasifier 14 is supplied to the flare supply line 50 without going through the char recovery device 15.

  The char recovery device 15 includes a dust collector 51 and a supply hopper 52. In this case, the dust collector 51 is constituted by one or a plurality of porous filters or cyclones, and can separate the char contained in the combustible gas generated by the gasifier 14. The combustible gas from which the char has been separated is sent to the gas purification device 16 through the gas discharge line 53. The supply hopper 52 stores the char separated from the combustible gas by the dust collector 51. A bin may be disposed between the dust collector 51 and the supply hopper 52, and a plurality of supply hoppers 52 may be connected to the bin. A char return line 46 from the supply hopper 52 is connected to the second nitrogen supply line 45.

The gas purification device 16 performs gas purification by removing impurities such as sulfur compounds and nitrogen compounds from the combustible gas from which the char has been separated by the char recovery device 15. The gas purifier 16 purifies the combustible gas to produce fuel gas and supplies it to the gas turbine equipment 17. Since the combustible gas from which the char has been separated still contains a sulfur content (such as H ₂ S), the gas purifier 16 removes the sulfur content with an amine absorbing solution, thereby obtaining a sulfur content. Is finally collected as gypsum and used effectively.

  The gas turbine equipment 17 includes a compressor 61, a combustor 62, and a turbine 63, and the compressor 61 and the turbine 63 are connected by a rotating shaft 64. A compressed air supply line 65 from the compressor 61 is connected to the combustor 62, a fuel gas supply line 66 from the gas purification device 16 is connected to the combustor 62, and a combustion gas supply line 67 extending toward the turbine 63 is connected. Is connected. Further, the gas turbine equipment 17 is provided with a compressed air supply line 41 extending from the compressor 61 to the gasifier 14, and a booster 68 is provided in the middle. Therefore, in the combustor 62, the compressed air supplied from the compressor 61 and the fuel gas supplied from the gas purification device 16 are mixed and burned to generate combustion gas, and the generated combustion gas is converted to the turbine 63. Supply towards The turbine 63 rotates the generator 19 by rotating the rotating shaft 64 with the supplied combustion gas.

  The steam turbine facility 18 includes a turbine 69 that is coupled to the rotating shaft 64 of the gas turbine facility 17, and the generator 19 is coupled to the base end portion of the rotating shaft 64. The exhaust heat recovery boiler 20 is connected to an exhaust gas line 70 from the gas turbine equipment 17 (the turbine 63), and generates steam by performing heat exchange between the feed water and the high temperature exhaust gas. The exhaust heat recovery boiler 20 is provided with a steam supply line 71 between the steam turbine equipment 18 and the turbine 69, a steam recovery line 72 is provided, and a condenser 73 is provided in the steam recovery line 72. Yes. Further, the steam generated in the exhaust heat recovery boiler 20 may include steam generated by heat exchange with the generated gas in the heat exchanger 102 of the gasification furnace 101 and further heat exchanged in the exhaust heat recovery boiler 20. . Therefore, in the steam turbine equipment 18, the turbine 69 is rotationally driven by the steam supplied from the exhaust heat recovery boiler 20, and the generator 19 is rotationally driven by rotating the rotating shaft 64.

  The exhaust gas from which heat has been recovered by the exhaust heat recovery boiler 20 is freed of harmful substances by the gas purification device 74, and the purified exhaust gas is discharged from the chimney 75 to the atmosphere.

  Here, the action | operation of the coal gasification combined cycle power generation equipment 10 of Embodiment 1 is demonstrated.

  In the coal gasification combined power generation facility 10 according to the first embodiment, when raw coal (coal) is supplied to the coal supply device 11, the coal is pulverized into fine particles by being pulverized into fine particles in the coal supply device 11. . The pulverized coal produced by the coal feeder 11 is supplied to the gasifier 14 through the first nitrogen supply line 43 by nitrogen supplied from the air separator 42. Further, the char recovered by the char recovery device 15 to be described later is supplied to the gasifier 14 through the second nitrogen supply line 45 by nitrogen supplied from the air separation device 42. Further, compressed air extracted from a gas turbine facility 17 described later is boosted by a booster 68 and then supplied to the gasifier 14 through the compressed air supply line 41 together with oxygen supplied from the air separator 42.

  In the gasifier 14, the supplied pulverized coal and char are combusted by compressed air (oxygen), and the pulverized coal and char are gasified to generate combustible gas (product gas). This combustible gas is discharged from the gasifier 14 through the gas generation line 49 and sent to the char recovery device 15.

  In the char recovery device 15, the combustible gas is first supplied to the dust collector 51, whereby the fine char contained in the combustible gas is separated. The combustible gas from which the char has been separated is sent to the gas purification device 16 through the gas discharge line 53. On the other hand, the fine char separated from the combustible gas is deposited on the supply hopper 52, returned to the gasifier 14 through the char return line 46, and recycled.

  The combustible gas from which the char has been separated by the char recovery device 15 is subjected to gas purification by removing impurities such as sulfur compounds and nitrogen compounds in the gas purification device 16 to produce fuel gas. In the gas turbine facility 17, when the compressor 61 generates compressed air and supplies the compressed air to the combustor 62, the combustor 62 is supplied from the compressed air supplied from the compressor 61 and the gas purification device 16. Combustion gas is generated by mixing with fuel gas and combusting, and the turbine 63 is rotationally driven by this combustion gas, so that the generator 19 can be rotationally driven via the rotating shaft 64 to generate electric power. .

  And the exhaust gas discharged | emitted from the turbine 63 in the gas turbine equipment 17 produces | generates a steam by performing heat exchange with water supply in the exhaust heat recovery boiler 20, and supplies this produced | generated steam to the steam turbine equipment 18. . In the steam turbine facility 18, the turbine 69 is rotationally driven by the steam supplied from the exhaust heat recovery boiler 20, so that the generator 19 can be rotationally driven via the rotating shaft 64 to generate electric power.

  Thereafter, in the gas purification device 74, harmful substances in the exhaust gas discharged from the exhaust heat recovery boiler 20 are removed, and the purified exhaust gas is discharged from the chimney 75 to the atmosphere.

  Next, with reference to FIG.1 and FIG.2, the gasification apparatus 14 in the coal gasification combined cycle power generation facility 10 mentioned above is demonstrated in detail.

  As shown in FIG. 2, the gasifier 14 includes a gasifier 101, a heat exchanger 102, a dehumidifier 103, a nitrogen supply system (inert gas supply system) 104, and a control device 105. ing.

  The gasification furnace 101 is formed to extend in the vertical direction, and pulverized coal and oxygen are supplied to the lower side in the vertical direction, and combustible gas (product gas) gasified by partial combustion is lower in the vertical direction. From the top to the top. The gasification furnace 101 includes a pressure vessel 110 and a gasification furnace wall 111 provided inside the pressure vessel 110. In the gasification furnace 101, an annulus portion 115 is formed in a space between the pressure vessel 110 and the gasification furnace wall 111. Further, the gasification furnace 101 has a combustor unit 116, a diffuser unit 117, and a reductor unit 118 in order from the lower side in the vertical direction (that is, the upstream side in the flow direction of the product gas) in the space inside the gasification furnace wall 111. Is forming.

  The pressure vessel 110 is formed in a cylindrical shape having a hollow space inside, a gas discharge port 121 is formed at the upper end portion, and a slag hopper 122 is formed at the lower end portion (bottom portion). The gasification furnace wall 111 is formed in a cylindrical shape whose inside is a hollow space, and the wall surface thereof is provided to face the inner surface of the pressure vessel 110. The gasification furnace wall 111 is connected to the inner surface of the pressure vessel 110 by a support member (not shown).

  The gasification furnace wall 111 is formed by joining heat transfer tubes and fins (not shown) to each other by welding or the like. The gasification furnace wall 111 has an upper end connected to the gas outlet 121 of the pressure vessel 110 and a lower end provided with a gap from the bottom of the pressure vessel 110. The slag hopper 122 formed at the bottom of the pressure vessel 110 stores stored water, and the lower end of the gasification furnace wall 111 is immersed in the stored water, thereby sealing the inside and outside of the gasification furnace wall 111. It has stopped.

  The annulus portion 115 is a space formed inside the pressure vessel 110 and outside the gasification furnace wall 111. Nitrogen, which is an inert gas separated by the air separation device 42, passes through a nitrogen supply line (not shown). Supplied. For this reason, the annulus portion 115 becomes a space filled with nitrogen. An in-furnace pressure equalizing tube (not shown) for equalizing the pressure in the gasification furnace 101 is provided in the vicinity of the upper portion of the annulus portion 115 in the vertical direction. The pressure equalizing tube in the furnace is provided so as to communicate between the inside and outside of the gasification furnace wall 111, and the inside (combustor part 116, diffuser part 117, and reductor part 118) of the gasification furnace wall 111 and the outside (annulus part 115) are uniformed. Pressure.

  The combustor unit 116 is a space for partially burning pulverized coal, char, and air, and a combustion apparatus including a plurality of burners 126 is disposed on the gasification furnace wall 111 in the combustor unit 116. The high-temperature combustion gas obtained by burning part of the pulverized coal and char in the combustor unit 116 passes through the diffuser unit 117 and flows into the reductor unit 118.

  The reductor unit 118 is maintained at a high temperature necessary for the gasification reaction, supplies pulverized coal to the combustion gas from the combustor unit 116, and converts the pulverized coal to volatile components (carbon monoxide, hydrogen, lower hydrocarbons, etc.). It is a space that generates flammable gas by pyrolysis and gasification. A combustion apparatus including a plurality of burners 127 is arranged on the gasification furnace wall 111 in the reductor unit 118.

  Here, the operation of the gasification furnace 101 of the gasification apparatus 14 of Embodiment 1 described above will be described.

  In the gasification furnace 101 of the gasifier 14, nitrogen and pulverized coal are supplied and ignited by the burner 127 of the reductor unit 118, and pulverized coal, char and compressed air (oxygen) are input by the burner 126 of the combustor unit 116. And ignited. Then, in the combustor unit 116, high-temperature combustion gas is generated by partial combustion of pulverized coal and char. Further, in the combustor section 116, molten slag is generated in the high-temperature gas by the combustion of pulverized coal and char, and this molten slag adheres to the gasification furnace wall 111 and falls to the furnace bottom, and finally in the slag hopper 122. Discharged into the water storage. Then, the high-temperature combustion gas generated in the combustor unit 116 rises to the reductor unit 118 through the diffuser unit 117. In this reductor unit 118, the high temperature state necessary for the gasification reaction is maintained, the pulverized coal is mixed with the high temperature combustion gas, and the pulverized coal is volatile (carbon monoxide, hydrogen, lower hydrocarbons) in a high temperature reducing atmosphere field. Etc.) and a gasification reaction is carried out to generate a combustible gas (product gas). Gasified combustible gas (product gas) flows from the lower side in the vertical direction toward the upper side.

  A heat exchanger (SGC: Syngas Cooler) 102 is provided inside the gasification furnace wall 111 and is provided above the burner 127 of the reductor unit 118 in the vertical direction. The heat exchanger 102 is, in order from the lower side in the vertical direction of the gasification furnace wall 111 (upstream side in the flow direction of the product gas), an evaporator 131, a superheater (super heater) 132, and a economizer (economizer). ) 134 is arranged. These heat exchangers 102 cool the generated gas by exchanging heat with the generated gas generated in the reductor unit 118. In addition, the evaporator (evaporator) 131, the superheater (super heater) 132, and the economizer 134 do not limit the quantity described in the figure.

  The removal device 103 is provided inside the gasification furnace 101 and injects nitrogen as an inert gas toward the heat exchanger 102. The removal device 103 includes a plurality of nitrogen supply pipes 141 that supply nitrogen to an evaporator (evaporator) 131, a superheater (superheater) 132, and a economizer 134, and each nitrogen supply pipe 141. And a plurality of flow rate adjustment valves 142 provided in the.

  The plurality of nitrogen supply pipes 141 are disposed downstream of the heat exchangers 131, 132, and 134 in the flow direction of the product gas, that is, on the upper side in the vertical direction. For this reason, in Embodiment 1, three are provided in FIG. 2 according to the number of each heat exchanger 131,132,134. Each nitrogen supply pipe 141 is formed with an injection hole penetrating the nitrogen supply pipe 141 so that nitrogen can be injected toward each heat exchanger 131, 132, 134 adjacent to the heat exchanger 102. . The injection hole of each nitrogen supply pipe 141 has a shape similar to that of a stationary soot blower (suit blower, not shown) in which the gasification furnace 101 is installed as an operating demolition device, and instead of steam. Nitrogen may be supplied to the substrate.

  The plurality of flow rate adjustment valves 142 can adjust the supply amount of nitrogen flowing through the nitrogen supply pipe 141 and are connected to the control device 105. The control device 105 controls each nitrogen flow control valve 142, thereby controlling the nitrogen injection operation of the hair removal device 103.

  The nitrogen supply system 104 is a system that supplies the nitrogen separated in the air separation device 42 toward the removal device 103. The nitrogen supply system 104 is provided with a flow rate adjustment valve 145 that can adjust the supply amount of nitrogen supplied to the dehuller 103. Further, the nitrogen supply system 104 branches into a plurality on the downstream side of the flow rate adjustment valve 145 and is connected to a plurality of nitrogen supply pipes 141, respectively. The flow rate adjusting valve 145 is connected to the control device 105, and the control device 105 controls the flow rate adjusting valve 145 to adjust the supply amount of nitrogen to the dehuller 103.

  The control device 105 controls the flow rate adjusting valves 142 and 145 to control the nitrogen injection operation of the removal device 103, and each heat exchanger 131 of the heat exchanger 102 is set at a preset injection timing. , 132, and 134 are injected with nitrogen. Specifically, with reference to FIG. 3, an injection operation of the hair removal device 103 controlled by the control device 105 will be described.

  In FIG. 3, the horizontal axis represents time. In FIG. 3, the vertical axis indicates, in order from the top, the pressure in the gasification furnace 101, the supply timing of purge nitrogen supplied into the gasification furnace 101, and representative locations near the heat exchanger (SGC) 102. Gas flow rate, and the nitrogen injection flow rate (nitrogen blow flow rate) from the removal device 103.

  In the first embodiment, in the gasification furnace stop phase, nitrogen injection by the degassing apparatus 103 is performed after the supply of pulverized coal to the gasification furnace 101 is stopped. First, prior to the injection operation of the degassing apparatus 103, the state change after the fuel supply stop of the gasifier 14 will be described corresponding to the passage from time (T1) to time (T3).

  The gasifier 14 stops the supply of pulverized coal into the gasifier 101 (T1), and discharges the generated gas remaining in the gasifier 101 from the gas discharge port 121, whereby the gasifier The pressure inside 101 is reduced. At this time, the gas flow velocity around the heat exchanger 102 after the stop of fuel supply (T1) is such that the product gas remaining at a high pressure in the gasification furnace 101 flows in a substantially constant amount. Become. Thereafter, when the pressure in the gasification furnace 101 decreases, the flow rate of the product gas toward the gas discharge port 121 becomes slow, so that the gas flow velocity around the heat exchanger 102 also decreases, and the inside of the gasification furnace 101 As the pressure approaches atmospheric pressure (relative pressure is zero), the gas flow rate around the heat exchanger 102 approaches zero. Thus, the period from the fuel supply stop T1 until the internal pressure reaches atmospheric pressure (relative pressure is zero) (T2) is the pressure reduction period P1. Here, since the pressure in the gasification furnace 101 takes a long time to atmospheric pressure (relative pressure is zero), the internal pressure at time T2 is a predetermined pressure slightly higher than atmospheric pressure (relative pressure is zero). May be managed.

  The gasifier 14 repeatedly fluctuates the pressure in the gasification furnace 101 and depressurizes it in order to purge the product gas remaining inside the gasification furnace 101 after the pressure reduction period P1. The purge nitrogen uses nitrogen or the like used as a carrier gas in the burners 126 and 127. Specifically, purge nitrogen is supplied into the gasification furnace 101, and supply and stop of the purge nitrogen are repeated a plurality of times (three times in the first embodiment). For this reason, the pressure in the gasification furnace 101 after the decompression period P1 fluctuates up and down repeatedly. Therefore, when purge nitrogen is supplied after the depressurization period P1, the pressure in the gasification furnace 101 increases, and then the supply of purge nitrogen is stopped, and then the gas in the gasification furnace 101 is discharged to the outlet 121. The pressure in the gasification furnace 101 is reduced by reducing the pressure of the gas. The gas flow rate at the representative location in the vicinity of the heat exchanger 102 after the pressure reduction period P1 increases when the purge nitrogen is depressurized after being supplied and stopped. After the supply and stop of the purge nitrogen are repeated, when the pressure inside the gasification furnace 101 becomes atmospheric pressure (relative pressure is zero), the gas flow rate at the representative location near the heat exchanger 102 becomes zero. As described above, the period from the time (T2) after the decompression period P1 to the time when the internal pressure in the gasification furnace 101 becomes zero again (T3) is the intermittent pressure purge period P2.

  And in Embodiment 1, the injection of nitrogen by the removal apparatus 103 is performed in the decompression period P1. That is, if the control device 105 determines that the depressurization period P1 has been reached after stopping the supply of pulverized coal to the gasifier 14, the control device 105 opens the flow rate adjustment valve 145 and executes supply of nitrogen from the nitrogen supply system 104. At the same time, the plurality of flow rate adjustment valves 142 are opened as appropriate, and nitrogen is injected from the plurality of nitrogen supply pipes 141 toward the heat exchangers 131, 132, and 134 of the heat exchanger 102.

  Here, the spraying operation of the hair removal device 103 controlled by the control device 105 will be described. Since the product gas is sequentially cooled by heat exchange in the heat exchangers 131, 132, and 134 of the heat exchanger 102, the upstream side in the flow direction of the product gas becomes higher in temperature than the downstream side, The soot adhering to the exchanger 102 tends to increase the adhesion force in the upstream heat exchanger 102 having a high temperature. For this reason, in Embodiment 1, when the nitrogen removal apparatus 103 injects nitrogen to each heat exchanger 131,132,134, the removal power by nitrogen is compared with the heat exchanger 102 on the most downstream side, The heat exchanger 102 on the most upstream side is raised. Note that it is more preferable that the upstream heat exchanger 102 is sequentially made higher than the downstream heat exchanger 102. That is, the degassing apparatus 103 has the highest nitrogen removal power for the evaporator 131 and the lowest nitrogen removal power for the economizer 134. The removal power can be increased by increasing the nitrogen injection pressure, increasing the nitrogen injection flow rate, or extending the nitrogen injection period. In the first embodiment, the removal force is increased by increasing the injection flow rate of nitrogen.

  Moreover, in Embodiment 1, the removal apparatus 103 is injecting nitrogen sequentially from the heat exchanger 102 on the upstream side of the product gas flow among the heat exchangers 102. That is, after the start of the injection of nitrogen into the evaporator 131, the removal apparatus 103 stops the injection of nitrogen into the evaporator 131. After that, after removing the nitrogen from the superheater 132, the dehuller 103 stops the nitrogen injection to the superheater 132. Next, after the start of the nitrogen injection to the economizer 134, the removal apparatus 103 stops the nitrogen injection to the economizer 134. As described above, the removal apparatus 103 starts nitrogen injection sequentially from the upstream heat exchanger 102 of the product gas flow, and stops nitrogen injection sequentially from the upstream heat exchanger 102. . The injection of nitrogen to each heat exchanger 102 removes soot adhering to the heat exchanger 102 on the upstream side of the product gas flow, and the soot is a gas flow in the direction from the upstream side to the downstream side of the generated product gas flow. Can be carried out of the gasification furnace 101. Therefore, even if the soot removed is reattached to the downstream heat exchanger 102 in the heat exchanger 102, nitrogen is sequentially injected into the downstream heat exchanger 102. It is possible to prevent the soot from adhering to the heat exchanger 102 and remain so that nitrogen can be effectively injected.

  In addition, the injection operation | movement by the removal apparatus 103 is not limited above, All the nitrogen injected from the several nitrogen supply pipe | tube 141 may be blown simultaneously, and you may blow partially partially. Moreover, the removal apparatus 103 may blow so that the injection timings of the nitrogen injected from the plurality of nitrogen supply pipes 141 partially overlap.

  As described above, according to the first embodiment, after stopping the supply of pulverized coal to the gasification furnace 101 in the stop period of the gasification furnace 101, by injecting nitrogen from the degassing apparatus 103 to the heat exchanger 102, Soot adhering to the heat exchanger 102 can be removed. At this time, even if it is difficult to secure the steam, the use of nitrogen makes it possible to remove the heat from the heat exchanger 102. Therefore, since the soot adhering to the heat exchanger 102 can be reduced, it is possible to suppress a part of the soot from being scattered at the next start-up of the gasification furnace 101 and to suppress the soot from being supplied to the ground flare equipment 21. Therefore, generation of black smoke from the ground flare equipment 21 can be suppressed.

  According to the first embodiment, the gas flow is generated in the gasification furnace 101 by reducing the pressure in the gasification furnace 101 during the pressure reduction period P1. For this reason, by injecting nitrogen from the removal device 103 during the decompression period P1, the waste removed by the removal device 103 can be carried out of the gasification furnace 101 by the generated gas exhaust flow.

  In addition, according to the first embodiment, the soot adhering to the heat exchanger 102 on the upstream side in the direction of the product gas flow is removed by increasing the removal force on the heat exchanger 102 on the upstream side of the gas flow. The device 103 can be suitably removed.

  Moreover, according to Embodiment 1, the soot removed by the removal device 103 is sequentially executed from the upstream side heat exchanger 102 in the direction of the product gas flow by the nitrogen injection by the removal device 103. The gas flow can be suitably distributed from the upstream side to the downstream side. For this reason, it is possible to prevent the removed soot from reattaching to the heat exchanger 102, so that the soot can be suitably transported out of the gasification furnace 101, and soot remains in the gasification furnace 101. Can be suppressed.

  Moreover, according to Embodiment 1, it can suppress that a soot is supplied to the ground flare equipment 21 by suppressing that a part of soot is scattered at the time of starting of the gasification apparatus 14. FIG. For this reason, generation | occurrence | production of the black smoke which generate | occur | produces by the combustion of soot in the ground flare equipment 21 is suppressed, the produced gas produced | generated by the gasifier 14 is supplied to the gas turbine equipment 17, and the turbine 63 and the steam turbine equipment 18 of When the turbine 69 is rotationally driven, the generator 19 can generate power.

[Embodiment 2]
Next, the gasifier 14 according to Embodiment 2 will be described with reference to FIG. In the second embodiment, parts that are different from the first embodiment will be described in order to avoid redundant descriptions, and parts that are the same as those in the first embodiment will be described with the same reference numerals. FIG. 4 is an explanatory diagram for explaining the injection timing of nitrogen gas by the gasifier according to the second embodiment.

  In the first embodiment, the removal device 103 injects nitrogen during the decompression period P1, but in the second embodiment, the removal device 103 also injects nitrogen during the decompression period P1 and the intermittent pressure purge period P2. In addition, since the injection of nitrogen in the decompression period P1 is the same as that in the first embodiment, the description thereof is omitted.

  When the nitrogen removal is performed in the intermittent pressure purge period P2, when the pressure in the gasification furnace 101 decreases, in other words, the gas removal apparatus 103 exhausts the gas in the gasification furnace 101 and increases the gas flow rate. Nitrogen is injected when it becomes. Here, in the intermittent pressure purge period P2, since supply and stop of the purge nitrogen are repeatedly performed a plurality of times, the nitrogen removal by the removal apparatus 103 is also executed a number of times corresponding to the number of repetitions.

  Then, the injection operation of the degassing apparatus 103 in the second embodiment is similar to the first embodiment in that the removal force of nitrogen is higher than that of the heat exchanger 102 on the downstream side in the direction of the product gas flow. The heat exchanger 102 is raised. Moreover, the removal apparatus 103 is injecting nitrogen sequentially from the heat exchanger 102 on the upstream side in the direction of the product gas flow. In addition, since the period during which the pressure in the gasification furnace 101 decreases in the intermittent pressure purge period P2 is shorter than the pressure reduction period P1, the nitrogen injection period to each of the heat exchangers 131, 132, and 134 is reduced. The intermittent pressure purge period P2 is shorter than the period P1.

  As described above, according to the second embodiment, when the pressure in the gasification furnace 101 decreases during the intermittent pressure purge period P2, a gas flow is generated in which gas is exhausted in the gasification furnace 101. For this reason, even during the intermittent pressure purge period P2, by blowing nitrogen from the degassing device 103, the soot removed by the degassing device 103 is carried out of the gasification furnace 101 by the generated gas exhaust flow. be able to. Therefore, it is possible to suppress the removed soot from reattaching to the heat exchanger 102.

[Embodiment 3]
Next, the gasifier 14 according to Embodiment 3 will be described with reference to FIG. In the third embodiment, parts that are different from the first and second embodiments will be described in order to avoid redundant descriptions, and parts that have the same configurations as those in the first and second embodiments will be described with the same reference numerals. FIG. 5 is a schematic configuration diagram illustrating a gasifier according to the third embodiment.

  As shown in FIG. 5, a steam supply system 201 in addition to the nitrogen supply system 104 is connected to the removal apparatus 200 of the gasifier 14 of the third embodiment. And the removal apparatus 200 can inject | pour toward each heat exchanger 102, switching nitrogen and a vapor | steam. The degassing apparatus 200 may use a stationary soot blower (suit blower) in which the injection hole of each nitrogen supply pipe 141 is installed as a degassing apparatus operating the gasification furnace 101. The degassing apparatus 200 intermittently injects steam during operation of the gasification furnace 101, injects it into each heat exchanger 131, 132, 134 adjacent to the heat exchanger 102, and combustion accumulated on the surface of the heat transfer tube or the like. It removes ash and supplies it by switching to nitrogen instead of steam.

  The steam supply system 201 is a system that supplies the steam generated by the heat exchanger 102 toward the dehuller 200. The steam supply system 201 is provided with a flow rate adjustment valve 202 that can adjust the supply amount of steam supplied to the dehuller 200. The steam supply system 201 is joined to the nitrogen supply system 104 and connected to the plurality of nitrogen supply pipes 141. For this reason, by sharing the injection holes for injecting the steam toward the heat exchangers 102 that can be injected with the plurality of nitrogen supply pipes 141, the steam and nitrogen can be switched and injected. The flow rate adjustment valve 202 is connected to the control device 105, and the control device 105 controls the flow rate adjustment valve 202, thereby adjusting the amount of steam supplied to the degarding device 200 and controlling the flow rate adjustment valve 145. By doing so, the supply amount of nitrogen to the dehuller 200 is adjusted.

  During operation of the gasification furnace 101, the control device 105 controls the steam injection operation of the degassing device 200 by controlling the flow rate adjustment valve 202 and the flow rate adjustment valve 142, and a preset injection timing is set. In addition, steam is sprayed toward each heat exchanger 131, 132, 134 adjacent to the heat exchanger 102. Specifically, the control device 105 periodically injects steam toward the heat exchanger 102 when supplying pulverized coal to the gasification furnace 101. As described above, the degassing apparatus 200 injects steam toward the heat exchangers 131, 132, and 134 when supplying the pulverized coal to the gasification furnace 101, so that the heat exchangers 131, 132, and 134 are injected. Remove any sticking to the surface. On the other hand, after the supply of pulverized coal to the gasification furnace 101 is stopped, the removal apparatus 200 switches from steam to nitrogen and injects nitrogen toward the heat exchangers 131, 132, and 134 so that each heat The scum adhering to the exchangers 131, 132, and 134 is removed.

  As described above, the degassing apparatus 200 can be configured to perform both the demolition with steam during the operation of the gasifier 14 and the denitrification with nitrogen after the gasifier 14 is stopped. The removal apparatus 200 has a longer nitrogen injection period for injecting nitrogen into the heat exchanger 102 than the steam injection period for injecting steam into the heat exchanger 102, so that the nitrogen removal ability can be improved. You may suppress a fall.

  As described above, according to the third embodiment, during the supply of pulverized coal to the gasification furnace 101 during operation of the gasification furnace 101, steam is injected from the degassing apparatus 200 to the heat exchanger 102. The soot adhering to the heat exchanger 102 can be removed. In addition, after the supply of pulverized coal to the gasification furnace 101 is stopped, soot adhering to the heat exchanger 102 can be removed by injecting nitrogen from the same removal apparatus 200 to the heat exchanger 102. Thus, the degassing apparatus 200 can suitably remove the soot adhering to the heat exchanger 102 by switching between nitrogen and steam to be injected according to the operating state of the gasification furnace 101.

[Embodiment 4]
Next, with reference to FIG. 6, the gasifier 14 which concerns on Embodiment 4 is demonstrated. In the fourth embodiment, parts that are different from those in the first to third embodiments will be described in order to avoid duplicate descriptions, and parts that have the same configuration as those in the first to third embodiments will be described with the same reference numerals. FIG. 6 is a schematic configuration diagram illustrating a gasifier according to the fourth embodiment.

  As shown in FIG. 6, the removal device 210 of the gasification apparatus 14 of the fourth embodiment performs a nitrogen injection operation based on a removal amount detection sensor (removal amount detection unit) 211. The removal amount detection sensor 211 detects the removal amount of the waste removed from the heat exchanger 102, and is attached to the supply hopper 52 of the char recovery device 15, for example. As this removal amount detection sensor 211, for example, a weight meter such as a load cell or a γ-ray level meter is used. The removal amount detection sensor 211 is connected to the control device 105. The control device 105 stores a database in which the nitrogen injection period by the removal apparatus 210 and the target removal amount associated with the injection period are associated with each other, and the detected removal detected by the removal amount detection sensor 211. The nitrogen injection operation is controlled so that the amount becomes the target removal amount.

  When the detected removal amount is smaller than the target removal amount, the control device 105 controls the nitrogen injection operation so that the detected removal amount becomes the target removal amount. Specifically, the control device 105 appropriately changes a nitrogen injection pressure, a nitrogen injection amount, a nitrogen injection period, a nitrogen injection timing, and the like. For example, the control device 105 executes the nitrogen injection operation not only during the pressure reduction period P1 but also during the intermittent pressure purge period P2, or increases the removal power of the degassing device 210.

  As described above, according to the fourth embodiment, the detection amount detected by the removal amount detection sensor 211 becomes the target removal amount, so that the dust attached to the heat exchanger 102 is appropriately removed. Can be detected. For this reason, since the injection quantity of nitrogen can be made into the injection quantity necessary and sufficient for removing, consumption of nitrogen can be suppressed.

  Although the tower type gasification furnace has been described in this embodiment, the gasification furnace is the same as the crossover type gasification furnace by replacing the vertical vertical direction of each device so as to match the gas flow direction of the product gas. Can be implemented.

10 Coal gasification combined power generation facility (gasification combined power generation facility)
DESCRIPTION OF SYMBOLS 11 Coal feeder 11a Coal feed line 14 Gasifier 15 Char recovery device 16 Gas refiner 17 Gas turbine equipment 18 Steam turbine equipment 19 Generator 20 Waste heat recovery boiler 21 Ground flare equipment 41 Compressed air supply line 42 Air separation device 43 First nitrogen supply line 45 Second nitrogen supply line 46 Char return line 47 Oxygen supply line 48 Foreign matter removing device 49 Gas generating line 50 Flare supply line 51 Dust collector 52 Supply hopper 53 Gas discharge line 61 Compressor 62 Combustor 63 Turbine 64 Rotating shaft 65 Compressed air supply line 66 Fuel gas supply line 67 Combustion gas supply line 68 Booster 69 Turbine 70 Exhaust gas line 71 Steam supply line 72 Steam recovery line 74 Gas purification device 75 Chimney 101 Gasification furnace 102 Heat exchange DESCRIPTION OF SYMBOLS 103 Dehumidifier 104 Nitrogen supply system 105 Control apparatus 110 Pressure vessel 111 Gasification furnace wall 115 Annulus part 116 Combustor part 117 Diffuser part 118 Reductor part 121 Gas outlet 122 Slag hopper 126 Burner 127 Burner 131 Evaporator 132 Superheater 134 141 Nitrogen supply pipe 142 Flow rate adjustment valve 145 Flow rate adjustment valve 200 Removal device (Embodiment 3)
201 Steam supply system 202 Flow rate adjustment valve 210 Removal device (Embodiment 4)
211 Removal detection sensor P1 Depressurization period P2 Intermittent pressure purge period

Claims (12)

A gasification furnace in which a carbon-containing solid fuel is supplied to generate a product gas, and the product gas flows;
A heat exchanger provided inside the gasification furnace for exchanging heat with the product gas;
Injecting an inert gas toward the heat exchanger in a state where a gas flow exists in the gasification furnace during a period in which the supply of the carbon-containing solid fuel to the gasification furnace is stopped A gasifier, comprising:   The gasifier according to claim 1, wherein a gas flow is present inside the gasifier during a period in which the pressure inside the gasifier decreases. The degassing apparatus is connected to an inert gas supply system that supplies the inert gas and a steam supply system that supplies steam,
The removal device is
While the supply of the carbon-containing solid fuel to the gasifier is stopped, the inert gas is injected toward the heat exchanger, while the carbon-containing solid fuel is injected into the gasifier. The inactive gas and the steam can be switched so as to inject steam toward the heat exchanger during the supply period. Gasifier. During the period when the supply of the carbon-containing solid fuel is stopped, a decompression period for decompressing the inside of the gasification furnace is provided,
The gasifier according to any one of claims 1 to 3, wherein the degassing device injects the inert gas during the decompression period. During the period when the supply of the carbon-containing solid fuel is stopped, a depressurization period for depressurizing the inside of the gasification furnace, and an intermittent pressure purge period for repeatedly changing the pressure in the gasification furnace several times after the depressurization period And
The gasifier according to any one of claims 1 to 4, wherein the degassing device injects the inert gas during the intermittent pressure purge period in addition to the decompression period. A plurality of the heat exchangers are arranged side by side from the upstream side in the flow direction of the product gas,
The removal apparatus increases at least one of the injection pressure, the injection flow rate, and the injection period of the inert gas with respect to the heat exchanger on the most upstream side, as compared with the heat exchanger on the most downstream side. The gasifier according to any one of claims 1 to 5, wherein the gasifier is characterized in that: A plurality of the heat exchangers are arranged side by side from the upstream side in the flow direction of the product gas,
The said removal apparatus starts injection of the said inert gas in order from the said heat exchanger of an upstream side to the said heat exchanger of a downstream side, The any one of Claim 1 to 6 characterized by the above-mentioned. The gasifier described. A plurality of the heat exchangers are arranged side by side from the upstream side in the flow direction of the product gas,
The said removal apparatus stops the injection of the said inert gas in order from the said heat exchanger of an upstream to the said heat exchanger of a downstream, In any one of Claim 1 to 7 characterized by the above-mentioned. The gasifier described. A removal amount detecting unit for detecting the removal amount of the waste removed by the removal device;
A target removal amount to be removed by the removal device is preset,
The said removal apparatus performs the injection operation | movement of the said inert gas so that the detection removal amount detected by the said removal amount detection part may become the said target removal amount. The gasification apparatus of any one of these. The gasification device according to any one of claims 1 to 9, wherein a carbon-containing solid fuel is supplied to generate a product gas;
A gas turbine that is rotationally driven by burning at least a part of the generated gas generated by the gasifier;
A steam turbine that is rotationally driven by steam generated by an exhaust heat recovery boiler that introduces turbine exhaust gas discharged from the gas turbine;
A gasification combined power generation facility comprising the gas turbine and a generator connected to the steam turbine. The gasification device according to any one of claims 1 to 9, wherein a carbon-containing solid fuel is supplied to generate a product gas;
A gas recovery facility comprising: a char recovery device connected to the gasification device and recovering char contained in the product gas supplied from the gasification device. A carbon-containing solid fuel is supplied to generate a product gas, and a gasification furnace in which the product gas flows, and a heat exchanger provided inside the gasification furnace and exchanging heat with the product gas, In a gasification device removal method comprising:
During the period when the supply of the carbon-containing solid fuel to the gasifier is stopped and the pressure inside the gasifier decreases, before the gasifier is started next time, A method for removing a gasifier, which comprises injecting an inert gas toward the heat exchanger in a state where a gas flow exists.

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