JP2012111819A - Gasification installation and combined coal gasification power generation installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasification installation that can stably be operated, even when a combustible gas is used as a gas for carrying a powder fuel, and to provide a combined coal gasification power generation installation.SOLUTION: The gasification installation 11 uses a combustible gas 28 containing a combustible component as a carrying gas for carrying fine coal from a fine coal supply hopper 24 to a coal gasification furnace 25, and includes a carrying gas supply pipe 61 for supplying an exhaust gas 28 containing the combustible component from the fine coal supply hopper 24 to an off-gas combustion furnace 16, and an inert gas supply portion 64 disposed on the carrying gas supply pipe 61 and used for supplying an inert gas 63 to the carrying gas supply pipe 61. The exhaust gas 28 exhausted from the fine coal supply hopper 24 is diluted with the inert gas 63 to lower the concentration of the combustible component contained in the exhaust gas 28 supplied to the off-gas combustion furnace 16. Thus, the combined coal gasification power generation installation 10 can safely and always be operated in an stable state.

Description

  INDUSTRIAL APPLICABILITY The present invention is applied to a gasification facility equipped with an integrated coal gasification combined cycle (IGCC) gasification furnace, a gasification furnace for chemicals, and the like, and a combustible gas as a transport medium for the gasification raw material. The present invention relates to a gasification facility using coal and a coal gasification combined power generation facility.

  Coal gasification combined power generation (IGCC) used for gas turbine combined power generation by converting solid fuel coal into coal gasification gas by a coal gasification furnace is known. Coal gasification combined power generation uses abundant reserves of coal resources, has higher thermal efficiency than conventional pulverized coal thermal power generation, and emits less air pollutants such as carbon dioxide. Is discharged as a glassy molten slag, and has an advantage that the volume is reduced. Therefore, coal gasification combined cycle power generation is being developed as a technology that will become the main force of future coal-fired power generation.

  As an IGCC gasification furnace, an air-blown gasification furnace having excellent efficiency and a chemical oxygen-blown gasification furnace to which an air-blown gasification furnace structure is applied are applied. Unlike gasification furnaces for power generation, chemical gasification furnaces have a high purity of carrier gas because the purity of chemical products, which are products, decreases if the carrier gas contains a large amount of inert gas such as nitrogen. Is important.

For this reason, CO ₂ or process gas is used as a gas medium for transportation in chemical gasification furnaces. As process gas, refined gasification gas (Clean Syngas) and tail gas after chemical synthesis (Tail gas) are used. However, effective utilization of these gases is also important for increasing the efficiency of the entire plant.

  Thus, for example, a coal gasification system using a combustible gas as a carrier gas for supplying pulverized coal and char to a gasification furnace has been proposed. According to this coal gasification system, after extracting char from the combustible gas produced | generated by the gasification furnace, what took out one part is used (for example, refer patent document 1).

JP 2000-328074 A

  Here, when combustible gas is used as a carrier gas for air-carrying pulverized fuel such as pulverized coal, the vacuum exhaust gas is processed and released to the atmosphere, and the safety of gasification equipment including a gasifier for IGCC, etc. While improving the driving efficiency. In that case, in order to achieve a more stable operation, it is necessary to supply the concentration of the combustible component contained in the decompressed exhaust gas supplied to the exhaust gas treatment to be equal to or lower than the combustible limit.

  The present invention has been made in view of the above, and provides a gasification facility and a coal gasification combined power generation facility capable of achieving a stable operation even when a combustible gas is used as a carrier gas for pulverized fuel. The purpose is to do.

  The first invention of the present invention for solving the above-described problem uses a combustible gas containing a combustible component as a carrier gas for conveying the pulverized fuel from a fuel supply hopper for storing the pulverized fuel to a gasification furnace. A gasification facility, provided in a carrier gas supply pipe for feeding the combustible gas discharged from the fuel supply hopper, and in the carrier gas supply pipe, and for supplying an inert gas in the carrier gas supply pipe A gasification facility comprising an inert gas supply means for supplying.

  According to a second invention, in the first invention, the combustibility of measuring the concentration of the combustible component contained in the combustible carrier gas in one or both of the fuel supply hopper and the carrier gas supply pipe. A gasification facility having a gas concentration measuring device.

  3rd invention uses the combustible gas containing a combustible component as carrier gas which conveys pulverized fuel, 1st or 2nd provided with the coal gasification furnace which processes the said pulverized fuel and produces | generates gaseous fuel The gasification equipment of the invention, the gas purification equipment for purifying the gaseous fuel and generating purified gas, the gas turbine equipment that operates using the gaseous fuel as fuel, and the combustion exhaust gas discharged from the gas turbine equipment are introduced. Off-gas combustion furnace for incinerating off-gas discharged from the steam turbine equipment operated by steam generated in the exhaust heat recovery boiler, combustible gas and gas fuel discharged from the gasification equipment, and the gas purification equipment It is a coal gasification combined cycle power plant characterized by having.

  According to the present invention, stable operation can be achieved even when a combustible gas is used as the carrier gas for the pulverized fuel.

FIG. 1 is a diagram schematically showing a configuration of a combined coal gasification combined power generation facility to which a gasification facility according to an embodiment of the present invention is applied. FIG. 2 is a diagram schematically illustrating another configuration of the gasification facility provided in the coal gasification combined power generation facility. FIG. 3 is a diagram simply showing another configuration of the gasification facility provided in the coal gasification combined power generation facility.

  DETAILED DESCRIPTION OF EMBODIMENTS Modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those that are so-called equivalent ranges. Furthermore, the constituent elements described below can be appropriately combined.

  FIG. 1 is a diagram schematically showing a configuration of a combined coal gasification combined power generation facility to which a gasification facility according to an embodiment of the present invention is applied. As shown in FIG. 1, a coal gasification combined power generation facility 10 includes a gasification facility 11, a gas purification facility 12, a gas turbine facility 13, an exhaust heat recovery boiler 14, a steam turbine facility 15, and an off-gas combustion furnace. 16.

  The gasification facility 11 of the present embodiment includes a raw coal bunker 21, a pulverized coal machine 22, a pulverized coal storage hopper 23, a pulverized coal supply hopper 24, a coal gasification furnace 25, a char recovery and recycling device 26, It is what has.

  Coal S, which is a raw material (fuel) for gasification, is supplied to the raw coal bunker 21 from, for example, a coal storage, temporarily stored in the raw coal bunker 21, and then supplied to the pulverized coal machine 22. The pulverized coal machine 22 pulverizes the coal S supplied from the raw coal bunker 21, and is pulverized to a desired particle size of about several μm to several hundred μm, for example, to obtain pulverized coal. The pulverized coal pulverized to a desired particle size is supplied from the pulverized coal machine 22 to the pulverized coal storage hopper 23 by combustion exhaust gas or the like.

  As the pulverized coal machine 22, for example, a crushing type such as a tube mill, a ball mill, or a roller mill can be used, but it is not particularly limited as long as the coal S can be pulverized.

The combustible gas 28 is not particularly limited as long as it contains a combustible component and has combustibility. Examples of the combustible component include a gas containing lower hydrocarbons such as CO, H ₂ , and CH _4. Is mentioned.

  In the present embodiment, the combustible gas supply unit 27 is provided as a device for supplying the combustible gas 28 to the coal gasification combined power generation facility 10. It is not limited, A part of combustible gas produced | generated in the coal gasification part 31 of the coal gasification furnace 25 is extracted from the downstream of the coal gasification part 31, and it is used as the combustible gas 28. Also good.

  The pulverized coal is fed from the pulverized coal machine 22 to the pulverized coal storage hopper 23 and temporarily stored. A required amount of the pulverized coal machine 22 stored in the pulverized coal storage hopper 23 is supplied to the pulverized coal supply hopper 24. The pulverized coal supply hopper 24 is supplied with a combustible gas 28 containing a combustible component from a combustible gas supply unit 27 as a transport gas (transport medium). The pulverized coal supplied to the pulverized coal supply hopper 24 is pressurized in the pulverized coal supply hopper 24 and is supplied to the coal gasification unit 31 by the combustible gas 28 supplied to the pulverized coal supply hopper 24. 28 and supplied to the air-blown coal gasifier 31. That is, the pulverized coal supply hopper 24 accepts the pulverized coal supplied from the pulverized coal storage hopper 23 at the atmospheric pressure to the pulverized coal storage hopper 23 and inputs the pulverized coal into the coal gasification unit 31 whose internal pressure is higher than the atmospheric pressure. When supplying pulverized coal to the coal gasification unit 31, the pulverized coal is pressurized and supplied to the combustible gas 28. For example, when the pressure in the coal gasification unit 31 is Pg, the pressure increase / decrease is adjusted in the range from the atmospheric pressure when receiving the pulverized coal from the pulverized coal machine 22 to the pressure “Pg + α” at the time of charging. The pulverized coal conveyed by the combustible gas 28 and supplied to the coal gasification unit 31 is gasified by the coal gasification unit 31.

  In FIG. 1, only one pulverized coal supply hopper 24 is provided. However, in the present embodiment, a plurality of pulverized coal supply hoppers 24 are actually provided in parallel. Each pulverized coal supply hopper 24 has a reduced pressure in the pulverized coal supply hopper 24 for receiving pulverized coal from the pulverized coal machine 22 in an atmospheric pressure state, and a combustible gas 28 fed into the coal gasification unit 31. The pressurization with the combustible gas 28 for charging the pulverized coal into the gas is sequentially repeated. By sequentially switching the pulverized coal supply hopper 24 that inputs pulverized coal to the combustible gas 28 supplied to the coal gasification unit 31, pulverized coal is continuously input to the coal gasification unit 31. .

  The supply position of the combustible gas 28 supplied into the coal gasification unit 31 is not particularly limited, and may be introduced from any of the tower bottom, the center of the tower, and the tower top of the coal gasification unit 31. Good.

The coal gasification furnace 25 is connected to the coal gasification unit 31 that combusts and gasifies part of the pulverized coal and char, and is generated in the coal gasification unit 31 connected to the downstream side of the coal gasification unit 31. A gas cooling unit 32 that cools the combustible gas and recovers heat is provided. In the coal gasification unit 31, the supplied pulverized coal and char are combusted and gasified, thereby generating gaseous fuel (coal gas) 33 containing combustible components such as CO and H ₂ as main components. Since the gaseous fuel 33 contains a combustible component, the gaseous fuel 33 may be used as the combustible gas 28 as a transport medium for the pulverized coal supplied to the pulverized coal supply hopper 24 or the coal gasification unit 31.

  The gaseous fuel 33 produced | generated in the coal gasification part 31 is sent to the gas cooling part 32, and collect | recovers the heat which the gaseous fuel 33 holds. The gas cooling unit 32 of the coal gasification furnace 25 is provided with a plurality of heat exchangers (not shown) that recover sensible heat from the gaseous fuel 33 led from the coal gasification unit 31. The heat recovered by the heat exchanger is supplied as steam to the steam turbine facility 15 via the exhaust heat recovery boiler 14.

The gaseous fuel 33 flowing out from the coal gasification furnace 25 is fed to the char recovery / recycling device 26. The char recovery / recycling device 26 separates the char from the gaseous fuel 33 flowing out from the coal gasification furnace 25. As described above, the gaseous fuel 33 contains char (unburned), sulfur and the like in addition to combustible components such as CO and H _{2. The} gaseous fuel 33 exiting the coal gasification furnace 25 is charged with char. The char and the like contained in the gaseous fuel 33 are removed by the recovery / recycling device 26. The recovered char is pressurized, supplied to the coal gasification unit 31 by the transfer gas, and gasified again. The gaseous fuel 33 from which the char has been separated by the char collecting / recycling device 26 is supplied to the gas purification facility 12. The char recovery / recycling device 26 may be any device that separates the char from the gaseous fuel 33, and includes, for example, a cyclone type dust collector. However, the present embodiment is not particularly limited thereto.

  The gas purification facility 12 purifies the gaseous fuel 33 and generates a purified gas 34. In the present embodiment, the gas purification facility 12 includes a desulfurization device 35. The desulfurization device 35 is for removing sulfur contained in the gaseous fuel 33. Examples of the sulfur content include sulfur compounds such as hydrogen sulfide and carbonyl sulfide. As described above, since the gaseous fuel 33 contains sulfur and the like in addition to the combustible gas, the desulfurization device 35 desulfurizes the gaseous fuel 33 and removes the sulfur contained in the gaseous fuel 33. . The desulfurization device 35 may be any device as long as it can remove sulfur contained in the gaseous fuel 33. For example, the desulfurization device 35 is brought into countercurrent contact with water and contained in the gaseous fuel 33. An absorption tower that collects the sulfur content in water can be used.

  In addition to the desulfurization device 35, the gas purification facility 12 is appropriately provided with a device that removes components contained in the gaseous fuel 33 according to the components contained in the gaseous fuel 33. For example, when the gaseous fuel 33 contains other components such as Hg, the gas purification facility 12 is configured to include a device that removes other components such as Hg.

  In the present embodiment, the gas purification facility 12 includes the desulfurization device 35, but the present embodiment is not limited to this, and when the sulfur content is not included in the gaseous fuel 33, The gas purification facility 12 may not include the desulfurization device 35.

  The gaseous fuel 33 from which the sulfur content has been removed by the desulfurization device 35 becomes purified gas 34 and is supplied to the gas turbine equipment 13 as fuel. Further, the off gas 36 separated by the desulfurization device 35 is fed to the off gas combustion furnace 16 and incinerated.

  The gas turbine equipment 13 includes a turbo compressor 41, a gas turbine combustor 42, a gas turbine 43, a rotating shaft 44, and an air booster 45. The turbo compressor 41 sucks air and compresses it, and then supplies the compressed air to the gas turbine combustor 42. The turbo compressor 41 is provided on the rotating shaft 44 and is driven to rotate by the rotating shaft 44.

  The gas turbine combustor 42 burns an air-fuel mixture of compressed air supplied from the turbo compressor 41 and purified gas 34 supplied from the gas purification facility 12. The purified gas 34 is combusted by the gas turbine combustor 42 to generate a high-temperature and high-pressure combustion gas, and the generated combustion gas is supplied to the gas turbine 43.

  The gas turbine 43 is rotationally driven using the combustion gas generated by the gas turbine combustor 42, and converts a part of the heat energy or the like of the combustion gas into rotational energy.

  The rotating shaft 44 transmits the rotational driving force generated in the gas turbine 43 to the turbo compressor 41 and the gas turbine generator 46. The rotating shaft 44 includes the turbo compressor 41, the gas turbine 43, and the gas. A turbine generator 46 is arranged. The rotational driving force generated in the gas turbine 43 is transmitted to the turbo compressor 41 and the gas turbine generator 46 via the rotating shaft 44, and the gas turbine generator 46 is rotationally driven. Electric power is generated by driving the gas turbine generator 46.

  The combustion gas obtained by rotating the rotor of the gas turbine 43 in the gas turbine equipment 13 is supplied to the exhaust heat recovery boiler 14 as high-temperature combustion exhaust gas.

  The exhaust heat recovery boiler 14 exchanges heat between the steam exhausted from the steam turbine equipment 15 with the combustion exhaust gas supplied from the gas turbine 43 and the combustion exhaust gas supplied from the off-gas combustion furnace 16, and recovers heat to generate high-temperature steam. Is generated. In addition to the combustion exhaust gas discharged from the gas turbine 43, high-temperature combustion exhaust gas is also discharged from the off-gas combustion furnace 16, so the combustion exhaust gas discharged from the off-gas combustion furnace 16 is also supplied to the exhaust heat recovery boiler 14, Used as a heating source for the exhaust heat recovery boiler 14.

  The combustion exhaust gas discharged from the gas turbine equipment 13 and the off-gas combustion furnace 16 is used for steam generation by exchanging heat with the steam discharged from the steam turbine equipment 15 in the exhaust heat recovery boiler 14, and the exhaust heat is recovered. Thereafter, the combustion exhaust gas is subjected to a known necessary treatment, and then released from the chimney 47 into the atmosphere.

  The air booster 45 extracts a part of the compressed air from the turbo compressor 41, further boosts the pressure, and supplies it to the coal gasification unit 31. The compressed air supplied to the coal gasification unit 31 is fed into the coal gasification unit 31 together with pulverized coal and char.

  The steam turbine facility 15 includes a high pressure turbine 51, an intermediate pressure turbine 52, a low pressure turbine 53, and a rotating shaft 54. The high-pressure turbine 51, the intermediate-pressure turbine 52, and the low-pressure turbine 53 generate rotational driving force using high-pressure steam generated by exchanging heat with the combustion exhaust gas discharged from the gas turbine 43 in the exhaust heat recovery boiler 14. Yes, part of the heat energy etc. of the high-pressure steam is converted into rotational energy.

  The high-pressure steam generated in the exhaust heat recovery boiler 14 is directly supplied to the high-pressure turbine 51. The steam exhausted from the high-pressure turbine 51 is returned to the exhaust heat recovery boiler 14, exchanges heat with the combustion exhaust gas fed from the gas turbine equipment 13, and is reheated to the intermediate-pressure turbine 52 as high-temperature reheat steam. Supplied. Steam discharged from the intermediate pressure turbine 52 is supplied to the low pressure turbine 53.

  The rotary shaft 54 is provided with a high-pressure turbine 51, an intermediate-pressure turbine 52, and a low-pressure turbine 53, and the rotational driving force generated in the high-pressure turbine 51, the intermediate-pressure turbine 52, and the low-pressure turbine 53 It is transmitted to the turbine generator 55. The steam turbine generator 55 is rotationally driven by the rotation shaft 54 of the gas turbine equipment 13. Electric power is generated by driving the steam turbine generator 55.

  In the present embodiment, the combustible gas 28 supplied into the pulverized coal supply hopper 24 is used as a transport medium for transporting the pulverized coal in the pulverized coal supply hopper 24 to the coal gasification unit 31. The combustible gas 28 supplied into the pulverized coal supply hopper 24 pressurizes the pulverized coal supply hopper 24 and conveys the pulverized coal in the pulverized coal supply hopper 24 to the coal gasification unit 31, and then the pulverized coal supply hopper 24. When the flammable gas 28 remaining in the pulverized coal storage hopper 23 newly receives pulverized coal from the pulverized coal storage hopper 23, the combustible gas 28 is discharged from the carrier gas supply pipe 61 as the exhaust gas 28 by reducing the pressure in the pulverized coal supply hopper 24. The

  The carrier gas supply pipe 61 connects the pulverized coal supply hopper 24 and the off-gas combustion furnace 16, and supplies the flammable gas (exhaust gas) 28 discharged from the pulverized coal supply hopper 24 to the off-gas combustion furnace 16. The tube. An exhaust bag filter 62 is provided in the carrier gas supply pipe 61. The exhaust gas 28 discharged from the pulverized coal supply hopper 24 is supplied to the exhaust bag filter 62 via the carrier gas supply pipe 61. The exhaust gas 28 discharged from the pulverized coal supply hopper 24 is supplied to the off-gas combustion furnace 16 after removing particulate components and the like contained in the exhaust gas 28 by the exhaust bag filter 62 and removing the dust. The exhaust gas 28 recovered from the pulverized coal supply hopper 24 is incinerated in the offgas combustion furnace 16 together with the offgas 36 supplied from the desulfurization device 35. As described above, the exhaust heat generated when the exhaust gas 28 and the off gas 36 are incinerated in the off gas combustion furnace 16 is effectively used for generating steam in the exhaust heat recovery boiler 14. Since the plurality of pulverized coal supply hoppers 24 perform pressure increase / decrease in order and continuously input the pulverized coal to the coal gasification unit 31, the exhaust gas discharged from the pulverized coal supply hopper 24 at the time of pressure reduction 28 are sequentially processed.

  The carrier gas supply pipe 61 is provided with an inert gas supply unit (means) 64 that supplies the inert gas 63 into the carrier gas supply pipe 61. By supplying the inert gas 63 from the inert gas supply unit 64 to the carrier gas supply pipe 61, the exhaust gas 28 can be diluted with the inert gas 63, so that the combustible components contained in the exhaust gas 28 can be reduced. The concentration can be lowered. Thereby, the density | concentration of the combustible component contained in the exhaust gas 28 can be made into the density | concentration below a flammable limit. For this reason, since the exhaust gas 28 is supplied to the off-gas combustion furnace 16 in a state where the concentration of the combustible component contained in the exhaust gas 28 is maintained below the flammable limit, the exhaust gas 28 can be safely processed. The coal gasification combined power generation facility 10 can be operated in a stable state at all times.

  The carrier gas supply pipe 61 is provided with a combustible gas concentration measuring device 65 that measures the concentration of the combustible component of the inert gas 63. The measurement result of the concentration of the combustible component in the exhaust gas 28 measured by the combustible gas concentration measuring device 65 is transmitted to the control device 66. Based on the measurement result of the concentration of the combustible component of the exhaust gas 28 measured by the combustible gas concentration measuring device 65, the control device 66 sets an appropriate amount of the inert gas 63 to the carrier gas supply pipe 61 as an arbitrary amount. Can be supplied. Thus, by measuring the concentration of the combustible component of the exhaust gas 28, it becomes easy to adjust the supply amount of the inert gas 63 supplied to the carrier gas supply pipe 61. Therefore, the carrier gas supply pipe 61 The supply amount of the inert gas 63 supplied to can be minimized.

  In the present embodiment, the combustible gas concentration measuring device 65 is provided in the carrier gas supply pipe 61. However, the present embodiment is not limited to this, and as shown in FIG. 24 may be provided. In particular, from the viewpoint of more appropriately measuring only the gas component of the flammable gas 28 without containing the pulverized coal in the flammable gas 28 as much as possible, the flammable gas 28 is provided near the outlet where the flammable gas 28 is discharged. Is preferred. Thereby, since the concentration of the combustible component contained in the exhaust gas 28 can be measured more reliably, the supply amount of the inert gas 63 supplied to the carrier gas supply pipe 61 can be adjusted more reliably. it can. Further, as shown in FIG. 3, combustible gas concentration measuring devices 65-1 and 65-2 are provided in the vicinity of the outlet where the combustible gas 28 of the pulverized coal supply hopper 24 is discharged, as shown in FIG. 3. It may be. Thereby, since the concentration of the combustible component contained in the exhaust gas 28 can be measured more reliably, the supply amount of the inert gas 63 supplied to the carrier gas supply pipe 61 can be adjusted more reliably. It becomes possible.

  The inert gas 63 is supplied to the off-gas combustion furnace 16 by diluting the concentration of the combustible component contained in the exhaust gas 28 and setting the concentration of the combustible component contained in the exhaust gas 28 below the flammable limit. The purity of the active gas 63 may not be particularly high.

The inert gas 63 is not particularly limited, and for example, N ₂ gas, Ar gas, or the like is preferably used. In the present embodiment, the inert gas supply unit 64 is provided, and the inert gas 63 is supplied from the inert gas supply unit 64 to the carrier gas supply pipe 61. However, the present embodiment is limited to this. Is not to be done. For example, since N ₂ gas is obtained as a by-product when producing oxygen (air separation) used as an oxidant to be supplied to the coal gasification unit 31, N is obtained as a by-product when producing an oxidant. _{By using the two} gases as the inert gas 63, the inert gas 63 can be supplied to the carrier gas supply pipe 61 without providing a separate facility for producing the inert gas 63 separately.

  In the present embodiment, the combustible gas concentration measuring device 65 is provided in the carrier gas supply pipe 61, but the supply amount of the inert gas 63 supplied to the carrier gas supply pipe 61 is fixed. In some cases or when it is not necessary to measure the concentration of the combustible component of the exhaust gas 28, the combustible gas concentration measuring device 65 may not be provided.

  The combustible gas 28 used as the pulverized coal carrier gas and remaining in the pulverized coal supply hopper 24 is supplied to the offgas combustion furnace 16 as exhaust gas, and then incinerated in the offgas combustion furnace 16 as described above. The combustion exhaust gas generated by the incineration process is released from the chimney 47 to the atmosphere via the exhaust heat recovery boiler 14. For this reason, the used combustible gas 28 remaining in the pulverized coal supply hopper 24 can be safely discharged to the atmosphere by incineration in the off-gas combustion furnace 16.

  As described above, according to the coal gasification combined power generation facility 10 including the gasification facility 11 of the present embodiment, the inert gas 63 is supplied into the used exhaust gas 28 that is discharged from the pulverized coal supply hopper 24. Then, by diluting the exhaust gas 28 with the inert gas 63, the concentration of combustible components contained in the exhaust gas 28 can be lowered. For this reason, the exhaust gas 28 can be constantly supplied to the off-gas combustion furnace 16 in a state where the concentration of the combustible component contained in the exhaust gas 28 is maintained below the flammability limit. The combustible gas 28 can always be stably incinerated and safely released to the atmosphere. Thereby, the coal gasification combined cycle power generation facility 10 can be operated in a state in which safety is ensured in a constantly stable state.

  While the inert gas 63 tends to be an obstacle to gasification, the combustible gas 28 has good gasification efficiency. By using the flammable gas 28 as the carrier gas for carrying the air current to the air, it is possible to improve the gasification efficiency of the pulverized fuel compared to the case where the inert gas is used as the carrier gas in the coal gasification unit 31 it can.

  The high-temperature combustion exhaust gas discharged by incineration of the exhaust gas 28 in the off-gas combustion furnace 16 is a combustible gas because it is used for steam generation via the exhaust heat recovery boiler 14 when released to the atmosphere. By recovering the amount of heat (calorie) of the exhaust gas 28, the thermal efficiency of the gasification facility 11 and the coal gasification combined power generation facility 10 can be improved.

  Therefore, even if the combustible gas 28 is used as the transport medium for transporting the pulverized coal as the gasification raw material to the coal gasification unit 31, the coal gasification combined power generation facility 10 transports the pulverized coal to the coal gasification unit 31. Both the combustible gas 28 used as a transporting medium and the used combustible gas 28 remaining in the pulverized coal supply hopper 24 are always stably incinerated in the off-gas combustion furnace 16 and the exhaust heat recovery boiler 14. Therefore, the vehicle can be operated while ensuring safety in a stable state, and the driving efficiency can be improved.

  In the present embodiment, the case of the gasification facility 11 provided in the coal gasification combined power generation facility 10 using pulverized coal as pulverized fuel has been described. However, the present embodiment is not limited to this, As the body fuel, for example, pulverized fuel obtained by mixing plural kinds of powders such as biomass, pulverized coal and biomass can be used in the same manner.

  Although this embodiment demonstrated the case where it applied to the gasification equipment 11 for the coal gasification combined cycle power generation equipment 10, this embodiment is not limited to this, For example, a chemical coal gasification furnace etc. In addition, the present invention can also be applied to a gasification facility equipped with a gasification furnace that gasifies pulverized coal or other powder as a raw material (fuel).

  As described above, the gasification facility and the coal gasification combined power generation facility of the present invention are useful for a gasification facility that uses a combustible gas as a transport medium for a gasification raw material. Suitable for gasification equipment equipped with a gasification furnace.

DESCRIPTION OF SYMBOLS 10 Coal gasification combined cycle power generation equipment 11 Gasification equipment 12 Gas refinery equipment 13 Gas turbine equipment 14 Waste heat recovery boiler 15 Steam turbine equipment 16 Off-gas combustion furnace 21 Raw coal bunker 22 Pulverized coal machine 23 Pulverized coal storage hopper 24 Pulverized coal supply hopper (Fuel supply hopper)
25 Coal gasification furnace 26 Char recovery / recycling equipment 27 Combustible gas supply unit 28 Combustible gas (carrier medium), exhaust gas 31 Coal gasification unit 32 Gas cooling unit 33 Gas fuel (coal gas)
34 Refined gas 35 Desulfurization device 36 Off gas 41 Turbo compressor 42 Gas turbine combustor 43 Gas turbine 44 Rotating shaft 45 Air booster 46 Gas turbine generator 47 Chimney 51 High pressure turbine 52 Medium pressure turbine 53 Low pressure turbine 54 Rotating shaft 55 Steam turbine Generator 61 Carrier gas supply pipe 62 Exhaust bag filter 63 Inert gas 64 Inert gas supply section (means)
65, 65-1, 65-2 Combustible gas concentration measuring device 66 Control device S Coal (fuel)

Claims (3)

A gasification facility that uses a combustible gas containing a combustible component as a carrier gas for transporting the powdered fuel from a fuel supply hopper that stores the powdered fuel to a gasification furnace,
A carrier gas feed pipe for feeding the combustible gas discharged from the fuel supply hopper;
A gasification facility comprising an inert gas supply means provided in the carrier gas supply pipe and supplying an inert gas into the carrier gas supply pipe. In claim 1,
A gasification facility having a combustible gas concentration measuring device for measuring a concentration of the combustible component contained in the combustible carrier gas in one or both of the fuel supply hopper and the carrier gas supply pipe. The gasification facility according to claim 1 or 2, comprising a coal gasification furnace that uses a combustible gas containing a combustible component as a carrier gas for conveying a pulverized fuel, and processes the pulverized fuel to generate a gaseous fuel.
A gas purification facility for purifying the gaseous fuel and generating a purified gas;
A gas turbine facility that operates using the gaseous fuel as a fuel; and
Steam turbine equipment operated by steam generated in the exhaust heat recovery boiler into which the combustion exhaust gas discharged from the gas turbine equipment is introduced; and
A combined coal gasification combined power generation facility comprising a combustible gas and a gaseous fuel discharged from the gasification facility, and an offgas combustion furnace for incinerating offgas discharged from the gas purification facility.

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