JP2018115622A - Gasification furnace equipment, gasification composite power generation installation and starting method of gasification furnace equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide gasification furnace equipment, a gasification composite power generation installation and a starting method of gasification furnace equipment which shortens a starting time of a gasification furnace and permits energy-saving and lower cost.SOLUTION: Gasification furnace equipment includes: a gasification furnace; a water system each part 22 provided on an inner part of the gasification furnace; a steam drum 21 connected to the water system each part 22; an exhaust heat recovery boiler which supplies hot water compressed for the water system each part 22 upon the starting of the gasification furnace; a circulation system 24 in which hot water is circulated through the water system each part 22 and the steam drum 21; air separation equipment 42 which supplies compressed nitrogen for the steam drum 21 upon the starting of the gasification furnace; a steam condensor 73 which is connected to the steam drum 21 while being provided on an outlet of a steam turbine, and allows water to be supplied from the steam drum 21 upon the starting of the gasification furnace; and a gas extraction device 35 which is connected with the steam condenser 73 and extracts gas in the steam condensor 73. Therein, the gas extraction device 35 extracts gas from the steam condensor 73 upon the starting of the gasification furnace with an extraction amount larger than the extraction amount of gas extracted from the steam condensor 73 upon steam turbine operation.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gasification furnace facility, a gasification combined power generation facility, and a gasification furnace facility activation method.

  Conventionally, as a gasifier facility, carbon-containing fuel gasification that generates combustible gas by supplying carbon-containing solid fuel such as coal into the gasifier and partially combusting the carbon-containing solid fuel for gasification An apparatus (coal gasification facility) is known.

  In equipment that exchanges heat with combustion gas, there is a risk of low-temperature corrosion.For example, if the temperature inside the gasification furnace is below the acid dew point, it is caused by sulfur and moisture contained in the combustion gas. As a result, acid corrosion may occur in the heat transfer tubes of the heat exchanger. In the start-up period from when the gasifier equipment is stopped to when the carbon-containing solid fuel is charged into the gasifier and ignited, the gasifier is preliminarily set to a temperature exceeding the acid dew point. It needs to be raised.

  In the gasifier facility, a condenser is provided at the outlet of the steam turbine, and is also connected to a steam drum of a syngas cooler in the gasifier facility. The condenser is increased in vacuum by, for example, an ejector, and water is supplied from the steam drum when the gasifier is started. In Patent Document 1 below, an ejector (ejector) device circulates steam from the condenser to the exhaust gas cleaning device in order to place a condenser provided in the steam turbine in a vacuum state in a power plant. Is described.

Japanese Patent No. 5901397 (paragraphs [0031] to [0035])

  During the start-up period of the gasification furnace, warm water is supplied to a syngas cooler (heat exchanger) provided inside the gasification furnace in order to raise the inside of the gasification furnace to a temperature exceeding the acid dew point in advance. The warm water is warming water for heating the inside of the gasifier, and is supplied from, for example, the economizer outlet of the exhaust heat recovery boiler (HRSG). The hot water supplied to the syngas cooler passes through the heat transfer tube of the heat exchanger by the circulation pump, exchanges heat with the gas inside the gasifier, and raises the temperature of the gasifier.

  Hot water generated in the exhaust heat recovery boiler is high-temperature and high-pressure pressurized hot water, while it is supplied to a syngas cooler that is at normal pressure or slightly pressurized at the start of the gasification furnace and does not reach the specified pressure. As a result, the pressure drops to the saturation pressure or lower on the downstream side of the flow rate adjusting valve provided in the pipe connecting the exhaust heat recovery boiler and the syngas cooler, and flashes. Therefore, there is a possibility that erosion may newly occur in the piping due to the operation for suppressing acid corrosion at a low temperature, and it is necessary to gradually increase the supply amount of hot water to such an extent that no flash is generated. For this reason, there is a problem that it takes a long time to start the gasifier.

  On the other hand, by pressurizing the inside of the steam drum provided in the syngas cooler with nitrogen, the inside of the heat transfer tube of the syngas cooler becomes high pressure, and it is possible to prevent the occurrence of flash when supplying hot water to the syngas cooler. Therefore, it is not necessary to gradually increase the amount of hot water supplied from the exhaust heat recovery boiler in consideration of the occurrence of flash, and increase the amount of hot water supplied per unit time, that is, rapidly increase the amount of hot water supplied Therefore, the startup time of the gasifier can be shortened.

  However, the start-up time of the gasifier is still on the order of several hours. In the meantime, the gas turbine consumes auxiliary fuel such as light oil to start the gasifier before normal operation of the gasifier equipment, and operates a high power air separation unit (ASU) to generate nitrogen, It causes energy consumption and cost increase. Therefore, it is necessary to further save energy and reduce costs in starting the gasification furnace.

  The present invention has been made in view of such circumstances, and further includes a gasification furnace facility and a gasification combined power generation that can shorten the start-up time of the gasification furnace, and can achieve energy saving and cost reduction. It aims at providing the starting method of installation and gasification furnace equipment.

  A gasification furnace facility according to a first aspect of the present invention includes a gasification furnace, a water system heat exchanger provided in the gasification furnace, a steam drum connected to the water system heat exchanger, A hot water supply unit for supplying pressurized hot water to the water system heat exchanger, the water system heat exchanger and the steam drum are connected, and the hot water circulates through the water system heat exchanger and the steam drum. A circulation system, an inert gas supply unit that supplies a pressurized inert gas to the steam drum, and a steam turbine that is connected to the steam drum while being provided at an outlet of the steam turbine, and water is supplied from the steam drum. A condenser that is supplied, and a gas extraction unit that is connected to the condenser and extracts and exhausts gas in the condenser, and when the gasification furnace is started, the gas extraction unit With the extraction amount larger than the rated operation of the turbine, the condenser And extracting the gas evacuated.

  According to this configuration, the heat exchanger is provided inside the gasification furnace, and the heat exchanger is connected to the steam drum connected to the heat exchanger from the hot water supply unit when the gasification furnace is started. Since the supplied pressurized hot water circulates, the temperature of the interior of the gasifier rises when the gasifier is started. In addition, when the gasification furnace is started, an inert gas, such as nitrogen, is supplied to the steam drum and the interior of the circulation system and heat exchanger is also pressurized. When supplying hot water, the pressurized hot water does not flash. Therefore, it is not necessary to gradually increase the pressurized hot water supplied to the circulation system, and the startup time can be shortened. The hot water supply system is, for example, an exhaust heat recovery boiler.

  The condenser is also connected to the steam drum while being provided at the outlet of the steam turbine, and water is supplied from the steam drum when the gasification furnace is started, and the inert gas pressurized against the steam drum is supplied. , Dissolved in water and supplied to the condenser, where the inert gas is discharged into the air. At this time, the gas in the condenser is extracted by the gas extraction unit connected to the condenser. The gas extraction unit is, for example, a vacuum pump, and extracts gas from the condenser when starting the gasifier with an extraction amount larger than the extraction amount of gas extracted from the condenser during rated operation of the steam turbine. Therefore, even when the inert gas pressurized against the steam drum is dissolved in the water supplied from the steam drum to the condenser, the degree of vacuum in the condenser can be increased.

  Therefore, the amount of pressurized hot water supplied to the heat exchanger when the gasification furnace is started can be increased according to the amount of gas extracted by the gas extraction unit. Increasing the amount of pressurized hot water also increases the amount of inert gas dissolved in the water and increases the discharge of inert gas in the condenser. As mentioned above, the condenser is activated when the gasifier is started. Since the gas can be extracted with a large extraction amount, the degree of vacuum in the condenser can be kept high. Since the amount of pressurized hot water supplied to the heat exchanger at the start of the gasification furnace can be increased, the start-up time of the gasification furnace can be further shortened.

  Moreover, the temperature of the pressurized hot water supplied with respect to a heat exchanger at the time of starting of a gasification furnace can also be raised according to the gas extraction amount which a gas extraction part can extract. When the temperature of the pressurized hot water is increased, it is necessary to pressurize the steam drum so that the pressurized hot water does not flush, and as a result, the dissolved amount of the inert gas in the water also increases. However, in the present embodiment, as described above, the gas can be extracted from the condenser with a large extraction amount when the gasification furnace is started up, so that the degree of vacuum in the condenser can be maintained high. Since the temperature of the pressurized hot water supplied to the heat exchanger rises when the gasifier is started, the start time of the gasifier can be further shortened.

  In the first aspect, the gas extraction unit includes a vacuum pump and an ejector. When the pressure is equal to or higher than a predetermined pressure, a hogging operation is performed only by the vacuum pump. Holding operation by the ejector is performed, and the gas extraction unit is an extraction amount larger than an extraction amount of gas extracted from the condenser when performing the holding operation at the rated operation of the steam turbine, A gas may be extracted and exhausted from the condenser while performing the holding operation when the gasifier is started.

  According to this configuration, the gas extraction unit has an extraction amount that is larger than the extraction amount of the gas extracted from the condenser when the holding operation is performed during the rated operation of the steam turbine, and is held when the gasifier is started. Extract gas from the condenser while in operation.

  In the first aspect, the gas extraction unit includes a plurality of units, and each unit has an extraction capacity of gas extracted from the condenser capable of performing the holding operation during rated operation of the steam turbine. And when performing the said holding operation at the time of starting of the said gasification furnace, the said gas extraction part may be drive | operated by 2 or more units | sets.

  According to this configuration, the gas extraction unit is operated with one unit when performing a holding operation during rated operation of the steam turbine, and is operated with a plurality of units when performing a holding operation when starting the gasifier. It is possible to operate efficiently when extracting gas from the condenser.

  In the first aspect, a steam system heat exchanger that is provided inside the gasification furnace and through which the steam supplied from the steam drum flows after completion of startup of the gasification furnace, the steam system heat exchanger, and the A dump system that connects the condenser and discharges the steam from the steam system heat exchanger to the condenser after the start of the gasifier, and the steam that is provided in the dump system and flows through the dump system A regulating valve that regulates the flow rate, and a shut-off valve that is provided on the condenser side with respect to the regulating valve in the dump system, and that shuts off the flow of steam that flows through the dump system at least when the gasifier is started. You may prepare.

  According to this configuration, the steam system heat exchanger is provided inside the gasification furnace, and the steam supplied from the steam drum after the start of the gasification furnace flows through the steam system heat exchanger. Moreover, after the start of the gasification furnace, the steam from the steam system heat exchanger can be discharged from the steam system heat exchanger to the condenser via the dump system. The dump system is provided with an adjustment valve that adjusts the pressure of steam flowing through the dump system, and a shut-off valve on the condenser side of the adjustment valve. The shut-off valve shuts off the flow of steam flowing through the dump system when the gasifier is started. As a result, the amount of inert gas flowing into the condenser via the dump system can be reduced when starting the gasifier, compared with the case where only the regulating valve is provided in the dump system, and the vacuum inside the condenser is reduced. The degree of vacuum can be increased by suppressing the degree of pressure from temporarily decreasing.

  A gasification combined cycle power generation facility according to a second aspect of the present invention is produced by the gasification furnace facility according to the first aspect in which a produced gas is generated by burning and gasifying a carbon-containing solid fuel, and the gasification furnace facility. A gas turbine that is rotationally driven by burning at least a portion of the generated gas, and a steam turbine that is rotationally driven by steam including 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.

  The start method of the gasifier equipment which concerns on the 3rd aspect of this invention is the steam connected to the gasification furnace, the water system heat exchanger provided in the inside of the said gasification furnace, and the said water system heat exchanger A method for starting a gasifier facility comprising a drum, the step of supplying pressurized hot water to the water system heat exchanger when starting the gasifier, and the water system heat exchanger, In the circulation system connecting the steam drums, the hot water circulates between the water system heat exchanger and the steam drum, and the inert gas pressurized against the steam drum at the start of the gasifier. A condenser, which is provided at the outlet of the steam turbine and connected to the steam drum, recovers water from the steam drum when the gasifier is started, and is connected to the condenser The extracted gas is extracted from the steam. A step of extracting and exhausting gas from the condenser when starting the gasification furnace with an extraction amount larger than the extraction amount of gas extracted from the condenser during rated operation of the bottle. To do.

  ADVANTAGE OF THE INVENTION According to this invention, the starting time of a gasification furnace can be shortened more, and energy saving and cost reduction can be achieved.

It is a schematic block diagram which shows the coal gasification combined cycle power generation equipment which concerns on one Embodiment of this invention. It is the schematic block diagram which showed the gasification furnace installation of FIG. It is a schematic block diagram which shows the steam drum used at the time of starting of the gasification furnace equipment which concerns on one Embodiment of this invention, a circulation system, and a blow system. It is a schematic block diagram which shows the steam drum used at the time of starting of the gasifier furnace which concerns on the modification of one Embodiment of this invention, a circulation system, and a blow system.

[Coal gasification combined power generation facility]
FIG. 1 is a schematic configuration diagram of a combined coal gasification combined power generation facility to which a gasification furnace facility according to an embodiment of the present invention is applied.

  An integrated coal gasification combined cycle (IGCC) 10 to which the gasifier facility 14 according to the present embodiment is applied uses air as an oxidant, and the gasifier facility 14 uses fuel as fuel. An air combustion system that generates combustible gas (product gas) is adopted. And the coal gasification combined cycle power generation facility 10 refines the produced gas generated in the gasification furnace facility 14 into a fuel gas by the gas purification facility 16, and then supplies it to the gas turbine 17 to generate 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 facility 14, for example, a carbon-containing solid fuel such as coal is used.

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

  The coal supply facility 11 is supplied with coal, which is a carbon-containing solid fuel, as raw coal, and pulverizes the coal with a coal mill (not shown) to produce pulverized coal pulverized into fine particles. The pulverized coal produced in the coal supply facility 11 is pressurized by nitrogen gas as a transfer inert gas supplied from an air separation facility (ASU) 42 described later at the outlet of the coal supply line 11 a and is supplied to the gasifier facility 14. Supplied towards. 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 facility 14 is supplied with pulverized coal produced by the coal supply facility 11 and supplied with char returned (unreacted coal and ash) recovered by the char recovery facility 15 so that it can be reused. Has been.

  In addition, a compressed air supply line 41 from a gas turbine 17 (compressor 61) is connected to the gasifier furnace 14, and a part of the compressed air compressed by the gas turbine 17 is given a predetermined pressure by a booster 68. The gas can be supplied to the gasifier facility 14 after being boosted. The air separation facility 42 separates and generates nitrogen and oxygen from air in the atmosphere, and the air separation facility 42 and the gasifier facility 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 facility 11. In addition, a second nitrogen supply line 45 branched from the first nitrogen supply line 43 is also connected to the gasification furnace facility 14, and a char return line 46 from the char recovery facility 15 is connected to the second nitrogen supply line 45. It is connected. Further, the air separation facility 42 is connected to the compressed air supply line 41 by an oxygen supply line 47. Then, the nitrogen separated by the air separation facility 42 is used as coal or 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 facility 42 is used as an oxidant in the gasifier facility 14 by flowing through the oxygen supply line 47 and the compressed air supply line 41.

  The gasifier furnace 14 includes, for example, a two-stage spouted bed gasifier 101 (see FIG. 2). The gasifier facility 14 gasifies the coal (pulverized coal) and char supplied therein by partially combusting them with an oxidizing agent (air, oxygen) to produce a product gas. The gasifier facility 14 is provided with a foreign matter removing facility 48 for removing foreign matter (slag) mixed in the pulverized coal. The gasification furnace facility 14 is connected to a gas generation line 49 for supplying a generated gas toward the char recovery facility 15 so that the generated gas containing char can be discharged. In this case, as shown in FIG. 2, a syngas cooler 102 (gas cooler) may be provided in the gas generation line 49 to cool the generated gas to a predetermined temperature before supplying it to the char recovery facility 15.

  The char collection facility 15 includes a dust collection facility 51 and a supply hopper 52. In this case, the dust collection facility 51 is configured by one or a plurality of cyclones or porous filters, and can separate the char contained in the product gas generated by the gasification furnace facility 14. The product gas from which the char has been separated is sent to the gas purification facility 16 through the gas discharge line 53. The supply hopper 52 stores the char separated from the generated gas by the dust collection equipment 51. A bin may be disposed between the dust collection facility 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 facility 16 performs gas purification by removing impurities such as sulfur compounds and nitrogen compounds from the product gas from which the char has been separated by the char recovery facility 15. The gas purification facility 16 then refines the produced gas to produce fuel gas, and supplies this to the gas turbine 17. Since the product gas from which the char has been separated still contains sulfur (H ₂ S, etc.), the gas purification facility 16 removes and recovers the sulfur with an amine absorption liquid and effectively uses it. To do.

  The gas turbine 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 facility 16 is connected to the combustor 62, and a combustion gas supply line 67 extending toward the turbine 63 is connected. Is connected. In addition, the gas turbine 17 is provided with a compressed air supply line 41 extending from the compressor 61 to the gasifier facility 14, and a booster 68 is provided in the middle. Therefore, the combustor 62 generates combustion gas by mixing and combusting a part of the compressed air supplied from the compressor 61 and at least a part of the fuel gas supplied from the gas purification equipment 16. The generated combustion gas is supplied to the turbine 63. The turbine 63 rotates the generator 19 by rotating the rotating shaft 64 with the supplied combustion gas.

  The steam turbine 18 includes a turbine 69 that is connected to a rotating shaft 64 of the gas turbine 17, and the generator 19 is connected to a 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 17 (the turbine 63), and generates steam by exchanging heat between the water supply and the exhaust gas of the turbine 63. The exhaust heat recovery boiler 20 is provided with a steam supply line 71 and a steam recovery line 72 between the steam 69 and the turbine 69 of the steam turbine 18, and a condenser 73 is provided in the steam recovery line 72. Further, the steam generated in the exhaust heat recovery boiler 20 may include steam generated by heat exchange with the generated gas in the syngas cooler 102 of the gasification furnace 101. Therefore, in the steam turbine 18, the turbine 69 is rotated by the steam supplied from the exhaust heat recovery boiler 20, and the generator 19 is rotated by rotating the rotating shaft 64.

  A gas purification facility 74 is provided from the outlet of the exhaust heat recovery boiler 20 to the chimney 75.

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

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

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

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

  The product gas from which the char has been separated by the char recovery facility 15 is subjected to gas purification by removing impurities such as sulfur compounds and nitrogen compounds in the gas purification facility 16 to produce fuel gas. The compressor 61 generates compressed air and supplies it to the combustor 62. The combustor 62 mixes the compressed air supplied from the compressor 61 and the fuel gas supplied from the gas refining facility 16 and combusts to generate combustion gas. By rotating the turbine 63 with this combustion gas, the compressor 61 and the generator 19 are rotationally driven via the rotating shaft 64. In this way, the gas turbine 17 can generate power.

The exhaust heat recovery boiler 20 generates steam by exchanging heat between the exhaust gas discharged from the turbine 63 in the gas turbine 17 and the feed water, and supplies the generated steam to the steam turbine 18. In the steam turbine 18, the turbine 69 is rotationally driven by the steam supplied from the exhaust heat recovery boiler 20, whereby the generator 19 can be rotationally driven via the rotating shaft 64 to generate electric power.
The gas turbine 17 and the steam turbine 18 do not have to rotate and drive one generator 19 as the same axis, and may rotate and drive a plurality of generators as different axes.

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

  Next, with reference to FIG.1 and FIG.2, the gasification furnace equipment 14 in the coal gasification combined cycle power generation equipment 10 mentioned above is demonstrated in detail. FIG. 2 is a schematic configuration diagram showing the gasifier facility of FIG.

  As shown in FIG. 2, the gasification furnace facility 14 includes a gasification furnace 101 and a syngas cooler 102.

  The gasification furnace 101 is formed so as to extend in the vertical direction. Pulverized coal and oxygen are supplied to the lower side in the vertical direction, and the product gas gasified by partial combustion is directed from the lower side in the vertical direction toward the upper side. Are in circulation. The gasification furnace 101 includes a pressure vessel 110 and a gasification furnace wall (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. In this embodiment, the pressure vessel 110 has a cylindrical shape, and the diffuser portion 117 of the gasification furnace wall 111 is also formed in a cylindrical shape. 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 separates the interior of the pressure vessel 110 into an internal space 154 and an external space 156. As will be described later, the gasification furnace wall 111 has a cross-sectional shape that changes in a diffuser portion 117 between the combustor portion 116 and the reductor portion 118. The upper end portion of the gasification furnace wall 111 on the vertically upper side is connected to the gas discharge port 121 of the pressure vessel 110, and the lower end portion on the vertically lower side is provided with a gap from the bottom portion of the pressure vessel 110. ing. 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. Burners 126 and 127 are inserted into the gasification furnace wall 111, and the syngas cooler 102 is disposed in the internal space 154. The structure of the gasification furnace wall 111 will be described later.

  The annulus 115 is a space formed inside the pressure vessel 110 and outside the gasification furnace wall 111, that is, an external space 156. Nitrogen, which is an inert gas separated by the air separation equipment 42, is not shown in the figure. Supplied through the supply line. 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 pipe in the furnace is provided so as to communicate between the inside and outside of the gasification furnace wall 111, and the pressure between the inside (combustor part 116, diffuser part 117 and reductor part 118) and outside (annulus part 115) of the gasification furnace wall 111. The pressure is almost equalized so that the difference is within a predetermined 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, and supplies the pulverized coal to the combustion gas from the combustor unit 116 to partially burn the pulverized coal (for example, carbon monoxide, hydrogen, lower hydrocarbons, etc.). And a gasification furnace wall 111 in the reductor unit 118 is provided with a combustion device composed of a plurality of burners 127.

  The 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 syngas cooler 102 is a heat exchanger, and 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 (superheater) 132, A charcoal unit (economizer) 134 is arranged. These syngas coolers 102 cool the generated gas by exchanging heat with the generated gas generated in the reductor unit 118. Further, the quantity of the evaporator (evaporator) 131, the superheater (superheater) 132, and the economizer 134 is not limited.

Here, operation | movement of the above-mentioned gasifier furnace 14 is demonstrated.
In the gasification furnace 101 of the gasification furnace facility 14, nitrogen and pulverized coal are supplied and ignited by the burner 127 of the reductor unit 118, and pulverized coal and char and compressed air (oxygen) are generated by the burner 126 of the combustor unit 116. It is turned on and ignited. Then, in the combustor unit 116, high-temperature combustion gas is generated by the 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, the pulverized coal is partially burned in a high temperature reducing atmosphere, and the gasification reaction is performed. Is generated. The gasified product gas flows from the lower side to the upper side in the vertical direction.

[Activation of gasifier equipment]
Next, start-up of the gasifier equipment according to an embodiment of the present invention will be described. FIG. 3 is a schematic configuration diagram illustrating a steam drum, a circulation system, and a blow system that are used when the gasification furnace facility according to the embodiment of the present invention is started.

  The syngas cooler 102 shown in FIG. 2 is connected to the steam drum 21, and during normal operation of the gasifier facility 14, the steam drum 21 and each part of the water system (water system heat exchanger) 22 of the syngas cooler 102 are connected to the syngas cooler 102. In between, water circulates and steam is supplied from the steam drum 21 to the steam system (steam system heat exchanger) 23 of the syngas cooler 102. Here, each part 22 of the water system of the syngas cooler 102 is, for example, the evaporator 131 and the economizer 134 described above, and the steam system 23 of the syngas cooler 102 is, for example, the superheater 132 described above.

  The steam drum 21 shown in FIG. 3 is supplied with water from a water supply system (not shown) during normal operation of the gasifier facility 14 and supplies water to each part 22 of the water system via the circulation system 24. . During normal operation of the gasifier facility 14, the steam in the steam drum 21 is supplied to the steam system 23. When the gasification furnace 101 is started up, the steam drum 21 is supplied with pressurized hot water generated by the exhaust heat recovery boiler (HRSG) 20 as a hot water supply unit via the circulation system 24 and is generated by the air separation facility 42. And pressurized nitrogen is supplied.

  The circulation system 24 connects the steam drum 21 and each part 22 of the water system, and water circulates between the steam drum 21 and each part 22 of the water system during the normal operation of the gasification furnace facility 14. A gasifier circulation pump 25 is installed in the circulation system 24, and water circulates in the circulation system 24 by the driving force of the gasifier circulation pump 25. Further, the circulation system 24 is provided with a hot water receiving unit 26 that receives hot water generated by the exhaust heat recovery boiler 20 described later. In the example of this embodiment, the hot water receiving part 26 is installed between the gasifier circulation pump 25 and each part 22 of the water system. In addition, this invention is not limited to this example, The warm water receiving part 26 may be installed between each part 22 and the steam drum 21 of the water system | strain. The hot water receiving unit 26 is, for example, a manifold.

  When the gasification furnace 101 is started up, that is, in a start-up period from when the gasification furnace equipment 14 is stopped to when carbon-containing solid fuel such as coal is introduced into the gasification furnace 101 and ignited, the circulation system 24 is turned on. The hot water generated by the exhaust heat recovery boiler (HRSG) 20 is supplied as warming water supply. This hot water is generated by, for example, a high-pressure economizer of the exhaust heat recovery boiler 20, and has a high temperature and a high pressure. The hot water generated by the exhaust heat recovery boiler 20 is supplied to a hot water receiving unit 26 provided in the circulation system 24.

  The steam supply pipe 27 connects the steam drum 21 and the steam system 23 of the syngas cooler 102, and steam is supplied from the steam drum 21 to the steam system 23 through the steam supply pipe 27 during normal operation of the gasification furnace facility 14. The

  The main steam pipe 28 connects the steam system 23 and the exhaust heat recovery boiler 20, and main steam generated in the steam system 23 (for example, superheated steam generated by the superheater) is exhausted via the main steam pipe 28. It is supplied to the heat recovery boiler 20. The main steam pipe 28 is provided with a main steam valve 29 that adjusts the pressure of the steam flowing through the main steam pipe 28, and a shut-off valve 30 that blocks the flow of steam flowing through the main steam pipe 28. During normal operation of the gasifier facility 14, the shutoff valve 30 is fully open, and the steam pressure flowing through the main steam pipe 28 is adjusted by adjusting the opening of the main steam valve 29. When the gasification furnace 101 is started, the main steam valve 29 and the shutoff valve 30 are fully closed.

  The steam dump system 31 connects the steam system 23 and the condenser 73, and discharges (dumps) surplus steam generated in the steam system 23 to the condenser 73. Thereby, surplus steam is discharged out of the system of the gasifier facility 14. The steam dump system 31 is provided with a steam dump valve 32 that adjusts the steam pressure flowing through the steam dump system 31 and a shut-off valve 33 that blocks the flow of steam flowing through the steam dump system 31. During normal operation of the gasifier facility 14, the shutoff valve 33 is fully open, and the steam pressure flowing through the steam dump system 31 is adjusted by adjusting the opening degree of the steam dump valve 32. When the gasification furnace 101 is started, the steam dump valve 32 and the shut-off valve 33 are fully closed.

  Thereby, when the gasification furnace 101 is started, the steam and nitrogen in the steam drum 21 do not leak downstream from the steam system 23. Conventionally, the shut-off valve 33 has not been installed on the downstream side of the steam dump valve 32. Since the steam dump valve 32 is a pressure regulating valve, the shut-off property is low even when fully closed, and fluid leakage may occur in a high-pressure environment. Therefore, when the steam drum 21 is pressurized with nitrogen when the gasification furnace 101 is started up, if steam or nitrogen leaks to the downstream side of the steam dump valve 32, it is led to the condenser 73 and condensate. The vacuum degree of the vessel 73 was affected. On the other hand, by installing the shut-off valve 33, the steam and nitrogen in the steam drum 21 are surely prevented from leaking downstream from the steam system 23, and the vacuum degree of the condenser 73 is increased. It can be prevented from decreasing.

  The blow system 34 connects the steam drum 21 and the condenser 73, and discharges (blows) excess water in the steam drum 21 to the condenser 73. Thereby, excess water is discharged out of the system of the gasification furnace equipment 14 both in the normal operation of the gasification furnace equipment 14 and when the gasification furnace 101 is started.

  In the present embodiment, pressurized nitrogen supplied from the air separation facility 42 is used for pressurization in the steam drum 21 at the time of activation. The air separation facility 42 is an example of an inert gas supply unit. In addition, the gas used for pressurization in the steam drum 21 at the time of starting is not limited to nitrogen. For example, an inert gas is preferable, and carbon dioxide, argon, or water vapor may be supplied. The air separation facility 42 generates nitrogen and supplies the generated nitrogen to the steam drum 21 when the gasification furnace 101 is started. Pressurized nitrogen is supplied into the steam drum 21. Thereby, since the inside of each part 22 of the water system 22 of the circulation system 24 and the syngas cooler 102 is pressurized, when supplying the pressurized hot water from the exhaust heat recovery boiler 20 by the hot water receiving part 26, the pressurized hot water is supplied to the flow regulating valve. On the downstream side of 38, the pressure is greatly reduced to become equal to or lower than the saturation pressure, and no flashing occurs.

  In the condenser 73, during normal operation of the gasifier facility 14, steam used for driving the turbine 69 of the steam turbine 18 is recovered as exhaust steam from the turbine 69 of the steam turbine 18, and is condensed by heat exchange. Condensate. The condenser 73 is maintained in a predetermined vacuum state by heat exchange with the exhaust steam supplied from the turbine 69 of the steam turbine 18 by using cooling water introduced from outside (not shown) and condensing, and by the gas extraction device 35. The

  Further, in the condenser 73, during the normal operation of the gasifier facility 14, surplus steam is collected through the steam dump system 31, and surplus water is collected through the blow system 34. Further, when the gasification furnace 101 is started, surplus water is supplied to the condenser 73 via the blow system 34 and collected.

  The gas extraction device 35 is an example of a gas extraction unit, and extracts the gas in the condenser 73 and releases it to the atmosphere. The gas extraction device 35 has an extraction amount larger than the extraction amount of gas extracted from the condenser 73 during normal operation including the rated operation of the steam turbine 18, and gas is extracted from the condenser 73 when the gasification furnace 101 is started. Extract.

  In the present embodiment, the gas extraction device 35 includes, for example, a water-sealed rotary vacuum pump 36 as a vacuum pump and an ejector 37 that uses expansion energy of high-pressure steam generated by the exhaust heat recovery boiler 20 as an ejector. In the low vacuum region where the inside of the condenser 73 is equal to or higher than a predetermined pressure (for example, the pressure range in which the atmospheric pressure changes to the vacuum state), the water in the condenser 73 is discharged to the atmosphere by the water ring rotary vacuum pump 36. Is done. At this time, the gas in the condenser 73 is sucked only by the water ring rotary vacuum pump 36 bypassing the ejector 37. The operation using only the water-sealed rotary vacuum pump 36 is called a hogging operation.

  In the high vacuum region where the condenser 73 is below a predetermined pressure, the water in the condenser 73 is discharged to the atmosphere by the water ring rotary vacuum pump 36 and the ejector 37. At this time, the gas in the condenser 73 is sucked by the ejector 37 without bypassing the ejector 37, and the gas sucked by the ejector 37 is further sucked by the water ring rotary vacuum pump 36. Increases exhaust capacity. The operation by the water ring rotary vacuum pump 36 and the ejector 37 is called a holding operation. Thereby, the high vacuum state below a predetermined pressure can be maintained.

Next, the starting operation of the gasifier facility 14 according to the present embodiment will be described.
The start of the gasification furnace facility 14 is a period from when the gasification furnace facility 14 is stopped to when the gasification furnace 101 is charged with a carbon-containing solid fuel such as coal and ignited to be heated to a predetermined temperature. Therefore, it is necessary to start up the gasification furnace 101 until the temperature at the outlet of the syngas cooler 102 exceeds the acid dew point. After the start-up is completed, auxiliary fuel such as light oil is introduced into the gasification furnace 101 and ignited.

  When starting the gasification furnace facility 14, first, fuel such as light oil is burned, the gas turbine 17 is driven, and the exhaust gas discharged from the gas turbine 17 flows through the exhaust heat recovery boiler 20, thereby The heat exchange is performed and hot water and steam are generated. In the exhaust heat recovery boiler 20, since the feed water pressure to the boiler is increased, high-pressure hot water and steam are generated. Further, the air separation facility 42 is activated, and nitrogen is generated by the air separation facility 42.

  A part of the hot water generated by the exhaust heat recovery boiler 20 is supplied to the hot water receiving unit 26 of the circulation system 24 by adjusting the flow rate by the flow rate adjustment valve 38 as warming water supply. The hot water supplied to the hot water receiving unit 26 is circulated in the circulation system 24 by the gasifier circulation pump 25. At this time, the steam drum 21 is supplied with pressurized nitrogen generated by the air separation facility 42, and the circulation system 24 and each part of the water system 22 are added to a pressure at which the hot water generated by the exhaust heat recovery boiler 20 is not flushed. Maintained under pressure.

  At the start of the gasification furnace 101, excess water in the steam drum 21 is discharged (blowed) to the condenser 73 via the blow system 34, and excess water is discharged outside the system of the gasification furnace equipment 14. Is done. At this time, in the condenser 73, since the inside of the condenser 73 is in a depressurized state, the gas exceeding the solubility is released from the water supplied into the condenser 73. For this reason, the gas in the condenser 73 is extracted by the gas extraction device 35, exhausted to the atmosphere, and released. When the gasification furnace 101 is started, the gas extraction device 35 has an extraction amount larger than the extraction amount of the gas extracted from the condenser 73 during the holding operation during the normal operation including the rated operation of the steam turbine 18. Then, the gas is extracted from the condenser 73 and exhausted while performing the holding operation.

  In addition, when the gasification furnace 101 is started, the main steam valve 29 and the shutoff valve 30 provided in the main steam pipe 28 are in a fully closed state, and the steam dump valve 32 and the shutoff valve 33 provided in the steam dump system 31. Is fully closed. Since the steam dump valve 32 is a pressure regulating valve, even if it is fully closed, there is a risk of fluid leakage in a high pressure environment. For this reason, when the gas drum 101 is started, when the steam drum 21 is pressurized with nitrogen, the shut-off valve 33 is fully closed. This reliably prevents the steam and nitrogen in the steam drum 21 from leaking to the downstream side of the steam system 23.

  Thereby, each water system part 22 provided in the gasification furnace 101 is supplied from the exhaust heat recovery boiler 20 when the gasification furnace 101 is started up with the steam drum 21 connected to each water system part 22. The pressurized hot water is circulated. Thereby, when starting the gasification furnace 101, the inside of the gasification furnace 101 rises in temperature. Moreover, the supply flow rate of the pressurized hot water from the exhaust heat recovery boiler 20 is a flow rate with respect to the temperature rise state in the gasification furnace 101 so that the internal temperature of the gasification furnace 101 becomes at least the acid dew point temperature. You may control by the adjustment valve 38. FIG.

  Further, when the gasification furnace 101 is started, pressurized nitrogen is supplied to the steam drum 21 and the inside of the circulation system 24 and each part of the water system 22 is also pressurized. When supplying pressurized hot water, the pressurized hot water becomes below the saturation pressure and does not flash. Therefore, it is not necessary to gradually increase the pressurized hot water supplied to the circulation system 24, and the startup time can be shortened.

  The condenser 73 is also connected to the steam drum 21 while being provided at the outlet of the steam turbine 18, and water is supplied from the steam drum 21 when the gasification furnace 101 is started. At this time, the gas in the condenser 73 is extracted and exhausted by the gas extraction device 35 connected to the condenser 73. The gas extraction device 35 has an extraction amount larger than the extraction amount of gas extracted from the condenser 73 during normal operation including the rated operation of the steam turbine 18, and gas is extracted from the condenser 73 when the gasification furnace 101 is started. Since extraction and exhaust are performed, even when nitrogen for pressurization is dissolved in the water supplied from the steam drum 21 to the condenser 73 and discharged from the condenser 73, the degree of vacuum in the condenser 73 is increased. The degree of vacuum can be maintained without lowering.

  Therefore, the amount of pressurized hot water supplied to each part 22 of the water system when the gasification furnace 101 is started can be increased according to the amount of gas extracted by the gas extraction device 35. When the amount of pressurized hot water is increased, the dissolved amount of nitrogen in the water also increases. However, as described above, when the gasification furnace 101 is started, a large amount of gas is extracted from the condenser 73 and exhausted. As a result, the degree of vacuum can be maintained high without reducing the degree of vacuum in the condenser 73. Since the amount of pressurized hot water supplied to each part 22 of the water system increases when the gasification furnace 101 is started up, the temperature inside the gasification furnace 101 rises quickly, and the start-up time of the gasification furnace 101 is further increased. Can be shortened.

  Further, depending on the amount of gas extracted by the gas extraction device 35, the temperature of the pressurized hot water supplied to each part 22 of the water system when the gasification furnace 101 is started up or supplied to the steam drum 21. The pressure of the nitrogen produced can also be increased. Increasing the temperature of pressurized hot water or increasing the pressure of nitrogen increases the dissolved amount of nitrogen in water, but as described above, a large amount of gas is extracted from the condenser 73 when the gasifier 101 is started. Thus, the degree of vacuum in the condenser 73 can be maintained high. Since the temperature of the pressurized hot water supplied to each part 22 of the water system rises when the gasification furnace 101 starts up, the temperature inside the gasification furnace 101 rises further quickly, and the gasification furnace 101 starts up. Can be further shortened.

Next, a capacity selection method during the holding operation of the gas extraction device 35 will be described.
The amount of gas extracted during normal operation including the rated operation of the steam turbine 18 by the gas extraction device 35 is determined based on the amount of steam recovered by the condenser 73 from the steam turbine 18 during normal operation of the steam turbine 18. The

  On the other hand, the amount of gas (nitrogen) extracted when the gasification furnace 101 is activated by the gas extraction device 35 is determined as follows, for example.

  Assuming the start-up time required for the temperature inside the gasification furnace 101 to exceed the acid dew point, supply the hot water supply amount and temperature from the exhaust heat recovery boiler 20 to the steam drum 21 so that the assumed start-up time is reached. Determine the nitrogen pressure. By determining the hot water supply amount, the amount of drainage discharged from the steam drum 21 to the condenser 73 via the blow system 34 is determined. At this time, the amount of nitrogen dissolved in the wastewater discharged from the steam drum 21 to the condenser 73 via the blow system 34 is also calculated based on the temperature of the hot water and the pressure of nitrogen.

  And in the condenser 73, when the dissolved nitrogen vaporizes exceeding the solubility of water, a vacuum state falls. Therefore, the gas (nitrogen) extraction amount when the gas extraction device 35 performs the holding operation at the time of starting the gasifier equipment 14 so that the condenser 73 is maintained in a high vacuum state is the condenser 73. It is determined on the basis of the amount of wastewater discharged and the amount of dissolved nitrogen.

  Therefore, according to the present embodiment, the amount of hot water supplied from the exhaust heat recovery boiler 20, the temperature of hot water, and the pressure of nitrogen supplied to the steam drum 21 are determined to increase as the startup time is shortened. And the amount of drainage discharged | emitted from the steam drum 21 to the condenser 73 via the blow system | strain 34 increases, so that hot water supply amount increases. Along with this, the discharge amount of nitrogen from the water discharged from the steam drum 21 to the condenser 73 also increases. Further, the amount of nitrogen dissolved in the amount of drainage discharged from the steam drum 21 to the condenser 73 via the blow system 34 increases as the hot water temperature and the nitrogen pressure increase. Therefore, in order to maintain the condenser 73 in a high vacuum state when the gasification furnace 101 is started, the amount of gas extracted from the gas when the gas extraction device 35 performs the holding operation is also exhausted. The temperature rises compared to the case where pressurized nitrogen is not supplied to the steam drum 21.

  When supplying pressurized nitrogen to the steam drum 21, the gas extraction device 35 extracts the gas extracted from the condenser 73 during the holding operation during the normal operation including the rated operation of the steam turbine 18. Extraction and exhaust of an extraction amount larger than the extraction amount of Further, the gas is extracted from the condenser 73 and exhausted while performing a holding operation when the gasification furnace 101 is started. The gas extraction amount at the time of starting the gasification furnace 101 is, for example, at least twice the gas extraction amount when the holding operation is performed during the normal operation including the rated operation of the steam turbine 18.

  As shown in FIG. 3, when one gas extraction device 35 is installed, one gas extraction device 35 is extracted based on the determined gas (nitrogen) extraction amount at the time of starting the gasification furnace 101. The capacity to exhaust is determined. In this case, when the gasification furnace 101 is started up, the gas extraction device 35 is operated at a rated operation, and during normal operation including the rated operation of the steam turbine 18, the gas extraction device 35 is operated with a reduced ability to extract and exhaust. To do.

  In addition, as shown in FIG. 4, two or more gas extraction devices 35 may be installed. In this case, the capacity of one gas extraction device 35 is determined based on the amount of gas (nitrogen) extracted during the holding operation during the normal operation including the rated operation of the steam turbine 18. Then, based on the determined amount of gas (nitrogen) extracted and exhausted when the gasification furnace 101 is started, the capacity and the number of the remaining gas extraction devices 35 are determined. In this case, when the gasification furnace 101 is started, the gas extraction device 35 is operated by a plurality of units while performing a holding operation, and during normal operation including the rated operation of the steam turbine 18, the gas extraction device 35 is operated by one unit. Is done. In this example, since the number of gas extraction devices 35 to be operated is surely reduced during normal operation of the steam turbine 18, auxiliary power can be reduced and efficient operation is possible. In addition, when the vacuum degree of the condenser 73 is reduced due to the occurrence of an abnormality during normal operation of the steam turbine 18, the vacuum state is not reduced by activating other gas extraction devices 35. Therefore, the reliability of plant operation can be improved.

  When operating the gas extraction device 35 having the gas (nitrogen) extraction amount at the start of the gasification furnace 101 determined and when performing a trial operation, the degree of vacuum of the condenser 73 was confirmed and determined. The amount of hot water supplied from the exhaust heat recovery boiler 20 to the circulation system 24 may be adjusted according to the capacity of the gas extraction device 35 to extract and exhaust the gas.

  The gas extraction device 35 extracts a gas from the condenser 73 when the gasification furnace 101 is started up with an extraction amount larger than the extraction amount of the gas extracted from the condenser 73 during the rated operation of the steam turbine 18. Even when nitrogen is dissolved in the water supplied from the steam drum 21 to the condenser 73, the degree of vacuum can be maintained high without reducing the degree of vacuum in the condenser 73. Accordingly, the amount of pressurized hot water supplied to each part 22 of the water system and the temperature can be increased when the gasification furnace 101 is started, and the start-up time of the gasification furnace 101 can be further shortened.

  As a result, when the gasification furnace 101 is started up, the amount of fuel (light oil) consumed by the gas turbine and the time for operating the air separation facility 42 to generate nitrogen can be reduced, and energy saving and cost reduction can be achieved. it can. In addition, the capacity of the storage facility that stores the fuel (light oil) used by the gas turbine when starting the gasification furnace 101 can be reduced.

  Further, when the gasification furnace 101 is started, when the steam drum 21 is pressurized with nitrogen, the shutoff valve of the dump system is fully closed, and the steam and nitrogen in the steam drum 21 are downstream from the steam system 23. Leakage to the condenser 73 on the side is reliably prevented. Therefore, the vacuum state of the condenser 73 can be prevented from being lowered.

  In the above-described embodiment, coal is used as the fuel, but it can be applied to high-grade coal and low-grade coal, and is not limited to coal, and can be used as a renewable biological organic resource. For example, it is also possible to use thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuel (pellets and chips) made from these raw materials. .

  Moreover, although this embodiment demonstrated the tower type gasification furnace as a gasification furnace, even if the gasification furnace 101 is a crossover type gasification furnace, the vertical and vertical direction of each apparatus in the gasification furnace 101 is produced gas. By replacing the gas flow directions so as to match each other, the same implementation is possible.

10: Coal gasification combined power generation facility 11: Coal supply facility 11a: Coal supply line 14: Gasification furnace facility 15: Char recovery facility 16: Gas purification facility 17: Gas turbine 18: Steam turbine 19: Generator 20: Waste heat Recovery boiler (hot water supply section)
21: Steam drum 22: Water system parts (water system heat exchanger)
23: Steam system (steam system heat exchanger)
24: Circulation system 25: Gasifier circulation pump 26: Hot water receiving unit 27: Steam supply pipe 28: Main steam pipe 29: Main steam valve 30: Shut-off valve 31: Steam dump system 32: Steam dump valve 33: Shut-off valve 34 : Blow system 35: Gas extraction device (gas extraction unit)
36: Water-sealed rotary vacuum pump (vacuum pump)
37: Ejector (Ejector)
41: Compressed air supply line 42: Air separation equipment (nitrogen supply unit)
43: 1st nitrogen supply line 45: 2nd nitrogen supply line 46: Char return line 47: Oxygen supply line 48: Foreign substance removal equipment 49: Gas generation line 51: Dust collection equipment 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 73: Condenser 74: Gas purification equipment 75: Chimney 101: Gasification furnace 102: Syngas cooler 110: Pressure vessel 111: Gasification furnace wall 115: Annulus section 116: Combustor section 117: Diffuser section 118: Reductor section 121: Gas outlet 122: Slag hopper 126: Burner 127: Burner 31: evaporator 132: superheater 134: economiser 154: Internal space 156: external space

Claims (6)

A gasifier,
A water system heat exchanger provided inside the gasifier,
A steam drum connected to the water system heat exchanger;
A hot water supply unit for supplying pressurized hot water to the water system heat exchanger;
A circulation system that connects the water system heat exchanger and the steam drum, and the hot water circulates through the water system heat exchanger and the steam drum;
An inert gas supply unit for supplying a pressurized inert gas to the steam drum;
A condenser connected to the steam drum and provided with water from the steam drum while being provided at the outlet of the steam turbine;
A gas extraction unit connected to the condenser for extracting and exhausting the gas in the condenser;
With
At the time of starting up the gasification furnace, the gas extraction unit extracts and exhausts gas from the condenser with an extraction amount larger than that during rated operation of the steam turbine. The gas extraction unit is
A vacuum pump,
An ejector,
Have
Above a predetermined pressure, a hogging operation only by the vacuum pump is performed, and below the predetermined pressure, a holding operation by the vacuum pump and the ejector is performed,
The gas extraction unit has an extraction amount larger than an extraction amount of gas extracted from the condenser when the holding operation is performed during a rated operation of the steam turbine, and the holding unit is started when the gasifier is started. The gasifier equipment according to claim 1, wherein gas is extracted from the condenser and exhausted while operating. The gas extraction unit is composed of a plurality of units, and has a gas extraction capacity to be extracted from the condenser capable of performing the holding operation during rated operation of the steam turbine per unit,
3. The gasifier facility according to claim 2, wherein when the holding operation is performed when the gasifier is started up, two or more gas extraction units are operated. A steam system heat exchanger that is provided inside the gasification furnace and through which the steam supplied from the steam drum flows after completion of startup of the gasification furnace;
A dump system that connects the steam system heat exchanger and the condenser, and discharges steam from the steam system heat exchanger to the condenser after the start of the gasification furnace,
An adjustment valve that is provided in the dump system and adjusts the flow rate of steam flowing through the dump system;
A shut-off valve provided on the condenser side of the dump system than the regulating valve, and shuts off the flow of steam flowing through the dump system at least when the gasification furnace is started;
The gasifier facility according to any one of claims 1 to 3, further comprising: The gasification furnace equipment according to any one of claims 1 to 4, wherein a product gas is generated by burning and gasifying a carbon-containing solid fuel,
A gas turbine that is rotationally driven by burning at least a part of the generated gas generated in the gasifier facility;
A steam turbine that is rotationally driven by steam including 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. A gasification furnace facility start-up method comprising a gasification furnace, a water system heat exchanger provided inside the gasification furnace, and a steam drum connected to the water system heat exchanger,
Supplying pressurized hot water to the water system heat exchanger when starting the gasifier;
In the circulation system connecting the water system heat exchanger and the steam drum, the hot water circulates through the water system heat exchanger and the steam drum;
Supplying a pressurized inert gas to the steam drum when starting the gasifier;
A condenser connected to the steam drum, provided at the outlet of the steam turbine, recovers water from the steam drum when the gasification furnace is started; and
The gas extraction unit connected to the condenser has an extraction amount larger than the extraction amount of the gas extracted from the condenser during rated operation of the steam turbine, and the condenser is activated when the gasifier is started. Extracting and evacuating gas from,
The start method of the gasifier equipment characterized by comprising.

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