JP6890982B2 - How to start gasification furnace equipment, gasification combined cycle equipment and gasification furnace equipment - Google Patents

Description

The present invention relates to a gasification furnace facility, a gasification combined cycle facility, and a method for starting a gasification furnace facility.

Conventionally, as a gasification furnace facility, carbon-containing solid fuel such as coal is supplied into the gasification furnace, and the carbon-containing solid fuel is partially combusted and gasified to generate combustible gas. Equipment (coal gasification equipment) is known.

Equipment that exchanges heat with combustion gas may cause low-temperature corrosion. For example, if the temperature inside the gasifier is below the acid dew point, it is caused by the sulfur and moisture contained in the combustion gas. As a result, acid corrosion may occur in the heat transfer tube of the heat exchanger. In the gasification furnace, the temperature inside the gasification furnace is set to a temperature exceeding the acid dew point in advance during the start-up period from the state in which the gasification furnace equipment is stopped until the carbon-containing solid fuel is charged into the gasification furnace and ignited. Need to raise.

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

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

During the start-up period of the gasification furnace, hot water is supplied to a thin gas 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 hot water is warming water for heating the inside of the gasification furnace, and is supplied from, for example, an economizer outlet of an exhaust heat recovery boiler (HRSG). The hot water supplied to the sink gas cooler passes through the inside of the heat transfer tube of the heat exchanger by a circulation pump and exchanges heat with the gas inside the gasifier to raise the temperature inside the gasifier.

The hot water generated in the exhaust heat recovery boiler is high-temperature and high-pressure pressurized hot water, while it is supplied to the singus cooler, which is in a normal pressure or slightly pressurized state when the gasifier is started and has not reached a predetermined pressure. Then, the pressure drops on the downstream side of the flow control valve provided in the pipe connecting the exhaust heat recovery boiler and the singus cooler, becomes less than the saturation pressure, and flushes. Therefore, there is a possibility that new erosion may occur in the pipe due to the operation for suppressing acid corrosion at low temperature, and it is necessary to gradually increase the supply amount of hot water to the extent that flush does not occur. Therefore, there is a problem that the start-up time of the gasifier is required for a long time.

On the other hand, by pressurizing the inside of the steam drum provided in the Shingas cooler with nitrogen, the inside of the heat transfer tube of the Shingas cooler becomes high pressure, and when hot water is supplied to the Shingas cooler, the occurrence of a flash can be prevented. 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 a flash, and the amount of hot water supplied per unit time is increased, that is, the amount of hot water supplied is rapidly increased. Therefore, the start-up time of the gasifier can be shortened.

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

The present invention has been made in view of such circumstances, and is a gasification furnace facility and a gasification combined power generation capable of further shortening the start-up time of the gasification furnace, saving energy and reducing the cost. The purpose is to provide a method of starting equipment and gasifier equipment.

The gasifier equipment according to the first aspect of the present invention includes a gasifier, a water system heat exchanger provided inside the gasifier, and a steam drum connected to the water system heat exchanger. A hot water supply unit that supplies pressurized hot water to the water system heat exchanger is connected to the water system heat exchanger and the steam drum, and the hot water circulates between the water system heat exchanger and the steam drum. The circulating system, the inert gas supply unit that supplies the inert gas pressurized to the steam drum, and the outlet of the steam turbine are connected to the steam drum, and water flows from the steam drum. A condenser to be supplied and a gas extraction unit connected to the condenser to extract and exhaust the gas in the condenser are provided, and when the gasification furnace is started, the gas extraction unit is provided with the steam. By extracting a gas containing an inert gas dissolved in the water supplied from the steam drum with a larger extraction amount than during the rated operation of the turbine from the condenser and exhausting the gas , the condenser is in a vacuum state. It is characterized by maintaining.

According to this configuration, a heat exchanger is provided inside the gasifier, and the heat exchanger is connected to the steam drum connected to the heat exchanger from the hot water supply unit when the gasifier is started. Since the supplied pressurized hot water circulates, the temperature inside the gasifier rises when the gasifier is started. Further, when the gasifier is started, an inert gas pressurized to the steam drum, for example, nitrogen is supplied, and the inside of the circulation system and the heat exchanger is also pressurized, so that the pressure is increased from the hot water supply system. Pressurized hot water does not flush when supplying hot water. Therefore, it is not necessary to gradually increase the pressurized hot water supplied to the circulation system, and the start-up time can be shortened. The hot water supply system is, for example, an exhaust heat recovery boiler.

The condenser is installed at the outlet of the steam turbine and is also connected to the steam drum. Water is supplied from the steam drum when the gasifier is started, and the inert gas pressurized to the steam drum is released. , Dissolved in water and supplied to the condenser, the inert gas is released into the air by the condenser. 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 at the start of the gasifier with an extraction amount larger than the extraction amount of the gas extracted from the condenser during the rated operation of the steam turbine. Therefore, even when the inert gas pressurized to the steam drum is dissolved in the water supplied from the condenser 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 at the start of the gasifier 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 release of the inert gas in the condenser, but as mentioned above, the condenser is started when the gasifier is started. Since the gas can be extracted with a large amount of extraction from the condenser, the degree of vacuum in the condenser can be maintained in a high state. Since the amount of pressurized hot water supplied to the heat exchanger at the time of starting the gasifier can be increased, the start time of the gasifier can be further shortened.

Further, the temperature of the pressurized hot water supplied to the heat exchanger at the time of starting the gasifier can be raised according to the amount of gas extracted by the gas extraction unit. When the temperature of the pressurized hot water is raised, it is necessary to pressurize the steam drum more 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, since the gas can be extracted from the condenser with a large amount of extraction when the gasifier is started, 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 has a vacuum pump and an ejector, and when the pressure is equal to or higher than a predetermined pressure, the hog operation is performed only by the vacuum pump, and when the pressure is lower than the predetermined pressure, the vacuum pump and the vacuum pump The holding operation is performed by the ejector, and the gas extraction unit has an extraction amount larger than the extraction amount of the gas extracted from the condenser during the holding operation during the rated operation of the steam turbine. Gas may be extracted from the condenser and exhausted while performing the holding operation when the gasifier is started.

According to this configuration, the gas extraction unit has a larger extraction amount than the amount of gas extracted from the condenser during the holding operation during the rated operation of the steam turbine, and is held at the start of the gasifier. Extract gas from the condenser while operating.

In the first aspect, the gas extraction unit is composed of a plurality of units, and each unit has a capacity for extracting gas to be extracted from the condenser capable of performing the holding operation during the rated operation of the steam turbine. Then, when the holding operation is performed when the gasifier is started, the gas extraction unit may be operated by two or more units.

According to this configuration, the gas extraction unit is operated by one unit when the holding operation is performed during the rated operation of the steam turbine, and is operated by a plurality of units when the holding operation is performed when the gasifier is started. , Efficient operation is possible when extracting gas from the condenser.

In the first aspect, the steam system heat exchanger provided inside the gasifier, and the steam supplied from the steam drum after the start of the gasifier is completed, the steam system heat exchanger, the steam system heat exchanger, and the above. A dump system that connects to a water recovery device and discharges steam from the steam system heat exchanger to the water recovery device after the start-up of the gasification furnace is completed, and steam that is provided in the dump system and flows through the dump system. Further, a regulating valve for adjusting the flow rate and a shutoff valve provided in the dump system on the water recovery device side of the regulating valve to shut off the flow of steam flowing through the dump system at least when the gasifier is started. You may prepare.

According to this configuration, a steam system heat exchanger is provided inside the gasifier, and steam supplied from the steam drum flows through the steam system heat exchanger after the start-up of the gasifier is completed. Further, after the start-up of the gasifier is completed, 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 a regulating valve for adjusting the pressure of steam flowing through the dump system and a shutoff valve on the condenser side of the regulating valve. The shutoff 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 the gasifier is started, as compared with the case where only the regulating valve is provided in the dump system, and the vacuum inside the condenser can be reduced. It is possible to increase the degree of vacuum by suppressing the degree from decreasing even temporarily.

The gasification combined power generation equipment according to the second aspect of the present invention is generated by the gasification furnace equipment of the first aspect and the gasification furnace equipment that generate a generated gas 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, and a steam turbine that is rotationally driven by steam containing steam generated by an exhaust heat recovery boiler that introduces turbine exhaust gas discharged from the gas turbine. , The gas turbine and a generator connected to the steam turbine.

The method for starting the gasifier equipment according to the third aspect of the present invention is a gasifier, a water system heat exchanger provided inside the gasifier, and steam connected to the water system heat exchanger. A method of starting a gasifier facility including a drum, wherein when the gasifier is started, a step of supplying pressurized hot water to the water system heat exchanger, and the water system heat exchanger In the circulation system connecting the steam drums, the step in which the hot water circulates between the water system heat exchanger and the steam drum, and the inert gas pressurized to the steam drum at the time of starting the gasifier. A step of supplying water, a step of recovering water from the steam drum when the water condensing device connected to the steam drum while being provided at the outlet of the steam turbine, and the start of the gasifier. Occasionally, the gas extraction unit connected to the water concentrator dissolves in the water supplied from the steam drum in an extraction amount larger than the amount of gas extracted from the water concentrator during the rated operation of the steam turbine. and a gas containing inert gas have to extract and exhausted from the condenser, characterized in that it comprises a step of maintaining the vacuum state of the condenser.

According to the present invention, the start-up time of the gasification furnace can be further shortened, and energy saving and cost reduction can be achieved.

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

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

The integrated coal gasification combined cycle (IGCC) 10 to which the gasification combined cycle equipment 14 according to the present embodiment is applied uses air as an oxidizing agent, and in the gasification furnace equipment 14, from fuel. It uses an air combustion method that produces flammable gas (produced gas). Then, the integrated coal gasification combined cycle equipment 10 purifies the generated gas generated by the gasification combined cycle equipment 14 into a fuel gas by the gas refining equipment 16 and then supplies the gas to the gas turbine 17 to generate power. That is, the integrated coal gasification combined cycle facility 10 of the first embodiment is an air combustion type (air blown) power generation facility. As the fuel to be supplied to the gasifier facility 14, for example, a carbon-containing solid fuel such as coal is used.

As shown in FIG. 1, the integrated coal gasification combined cycle equipment (gasification combined cycle equipment) 10 includes a coal supply equipment 11, a gasification furnace equipment 14, a char recovery equipment 15, a gas purification equipment 16, and a gas turbine. It includes 17, a steam turbine 18, a generator 19, and an exhaust heat recovery steam generator (HRSG: Heat Recovery Steam Generator) 20.

The coal supply facility 11 supplies coal, which is a carbon-containing solid fuel, as raw coal, and crushes 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 transport inert gas supplied from the air separation facility (ASU) 42 described later at the outlet of the coal supply line 11a 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 nitrogen gas, carbon dioxide gas, argon gas and the like are typical examples, but the inert gas is 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 the char (unreacted coal and ash) recovered by the char recovery facility 15 is returned and supplied for reuse. Has been done.

Further, a compressed air supply line 41 from the gas turbine 17 (compressor 61) is connected to the gas turbine equipment 14, and a part of the compressed air compressed by the gas turbine 17 is pressed by the booster 68 at a predetermined pressure. It is possible to supply the gas to the gasifier equipment 14 by increasing the pressure. The air separation facility 42 separates and generates nitrogen and oxygen from the air in the atmosphere, and the air separation facility 42 and the gasifier facility 14 are connected by a first nitrogen supply line 43. A coal supply line 11a from the coal supply facility 11 is connected to the first nitrogen supply line 43. Further, a second nitrogen supply line 45 branching from the first nitrogen supply line 43 is also connected to the gasifier facility 14, and the second nitrogen supply line 45 has a char return line 46 from the char recovery facility 15. It is connected. Further, the air separation equipment 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 a transport gas for coal or char by flowing through the first nitrogen supply line 43 and the second nitrogen supply line 45. Further, 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 equipment 14 includes, for example, a two-stage jet bed type gasifier 101 (see FIG. 2). The gasification furnace facility 14 gasifies the coal (pulverized coal) and char supplied to the inside by partially burning them with an oxidizing agent (air, oxygen) to obtain a produced gas. The gasifier facility 14 is provided with a foreign matter removing facility 48 for removing foreign matter (slag) mixed in the pulverized coal. A gas generation line 49 for supplying the generated gas to the char recovery equipment 15 is connected to the gasifier facility 14, so that the generated gas containing the char can be discharged. In this case, as shown in FIG. 2, by providing a thin gas cooler 102 (gas cooler) in the gas generation line 49, the generated gas may be cooled to a predetermined temperature and then supplied to the char recovery equipment 15.

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

The gas refining facility 16 purifies the produced gas from which the char is separated by the char recovery facility 15 by removing impurities such as sulfur compounds and nitrogen compounds. Then, the gas refining facility 16 purifies the produced gas to produce a fuel gas, and supplies the fuel gas to the gas turbine 17. Since the char is still contained sulfur content in the product gas separated (such as H 2 _S) is, in the gas purification equipment 16 removes recovering sulfur by such amine absorbent, effective use 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 refining facility 16 is connected to the combustor 62, and a combustion gas supply line 67 extending toward the turbine 63 is connected. Is connected. Further, the gas turbine 17 is provided with a compressed air supply line 41 extending from the compressor 61 to the gasifier equipment 14, and a booster 68 is provided in the middle of the gas turbine 17. Therefore, in the combustor 62, a part of the compressed air supplied from the compressor 61 and at least a part of the fuel gas supplied from the gas refining facility 16 are mixed and burned to generate and burn the combustion gas. The generated combustion gas is supplied to the turbine 63. Then, the turbine 63 rotationally drives the generator 19 by rotationally driving the rotary shaft 64 with the supplied combustion gas.

The steam turbine 18 includes a turbine 69 connected to a rotating shaft 64 of the gas turbine 17, and a 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 a gas turbine 17 (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 exhaust heat recovery boiler 20 and the turbine 69 of the steam turbine 18, and a condenser 73 is provided on the steam recovery line 72. Further, the steam generated by the exhaust heat recovery boiler 20 may include steam generated by heat exchange with the generated gas in the thin gas cooler 102 of the gasification furnace 101. Therefore, in the steam turbine 18, the turbine 69 is rotationally driven by the steam supplied from the exhaust heat recovery boiler 20, and the generator 19 is rotationally driven by rotating the rotary 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 operation of the integrated coal gasification combined cycle facility 10 of the present embodiment will be described.

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

In the gasification furnace facility 14, the supplied pulverized coal and char are burned by compressed air (oxygen), and the pulverized coal and char are gasified to generate a generated gas. Then, this generated gas is discharged from the gasification furnace facility 14 through the gas generation line 49 and sent to the char recovery facility 15.

In the char recovery equipment 15, the generated gas is first supplied to the dust collecting equipment 51, so that the fine chars contained in the generated gas are separated. Then, the generated gas from which the char is separated is sent to the gas refining facility 16 through the gas discharge line 53. On the other hand, the fine char separated from the generated gas is deposited on the supply hopper 52, returned to the gasifier facility 14 through the char return line 46, and recycled.

The generated gas from which the char is separated by the char recovery facility 15 is gas refined by removing impurities such as sulfur compounds and nitrogen compounds in the gas refining facility 16 to produce fuel gas. The compressor 61 generates compressed air and supplies it to the combustor 62. The combustor 62 produces combustion gas by mixing compressed air supplied from the compressor 61 and fuel gas supplied from the gas refining equipment 16 and burning them. By rotationally driving 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 electricity.

Then, 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 water supply, 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, so that the generator 19 can be rotationally driven via the rotary shaft 64 to generate electricity.
The gas turbine 17 and the steam turbine 18 do not have to be rotationally driven by one generator 19 as the same axis, and a plurality of generators may be rotationally driven as different axes.

After that, the gas purification facility 74 removes harmful substances in the exhaust gas discharged from the exhaust heat recovery boiler 20, and the purified exhaust gas is discharged from the chimney 75 to the atmosphere.

Next, with reference to FIGS. 1 and 2, the gasification furnace facility 14 in the above-mentioned integrated coal gasification combined cycle facility 10 will be described in detail. FIG. 2 is a schematic configuration diagram showing the gasification furnace equipment of FIG.

As shown in FIG. 2, the gasifier equipment 14 includes a gasifier 101 and a thin gas cooler 102.

The gasification furnace 101 is formed so as to extend in the vertical direction, and pulverized coal and oxygen are supplied to the lower side in the vertical direction, and the generated gas gasified by partial combustion goes from the lower side to the upper side in the vertical direction. Is in circulation. The gasifier 101 has a pressure vessel 110 and a gasifier wall (furnace wall) 111 provided inside the pressure vessel 110. The gasifier 101 forms an annulus portion 115 in the space between the pressure vessel 110 and the gasifier wall 111. Further, in the space inside the gasification furnace wall 111, the gasifier 101 has a convertor portion 116, a diffuser portion 117, and a reducer portion 118 in this order from the lower side in the vertical direction (that is, the upstream side in the distribution direction of the generated gas). Is forming.

The pressure vessel 110 is formed in a tubular shape having a hollow space inside, and a gas discharge port 121 is formed at the upper end portion, while a slug hopper 122 is formed at the lower end portion (bottom portion). The gasification furnace wall 111 is formed in a tubular shape having a hollow space inside, and the wall surface thereof is provided so as to face the inner surface of the pressure vessel 110. In the present embodiment, the pressure vessel 110 is formed in 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 gasifier wall 111 separates the inside 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 shape in which the cross-sectional shape changes at the diffuser portion 117 between the convertor portion 116 and the reducer portion 118. The upper end of the gasifier wall 111 on the vertically upper side is connected to the gas discharge port 121 of the pressure vessel 110, and the lower end thereof on the vertically lower side is provided with a gap from the bottom of the pressure vessel 110. ing. The stored water is stored in the slug hopper 122 formed at the bottom of the pressure vessel 110, and the lower end of the gasification furnace wall 111 is flooded with the stored water to seal the inside and outside of the gasification furnace wall 111. It's stopped. Burners 126 and 127 are inserted into the gasification furnace wall 111, and a sink gas cooler 102 is arranged in the internal space 154. The structure of the gasification furnace wall 111 will be described later.

The annular portion 115 is a space formed inside the pressure vessel 110 and outside the gasifier wall 111, that is, an external space 156, and nitrogen, which is an inert gas separated by the air separation equipment 42, is nitrogen (not shown). It is supplied through the supply line. Therefore, the annulus portion 115 becomes a space filled with nitrogen. A pressure equalizing pipe (not shown) for equalizing the pressure inside the gasification furnace 101 is provided near 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 the inside and outside of the gasification furnace wall 111, and the pressure between the inside (combustor part 116, diffuser part 117 and reducer part 118) and the outside (annulus part 115) of the gasification furnace wall 111. The pressure is approximately equalized so that the difference is within a predetermined pressure.

The combustor section 116 is a space for partially burning pulverized coal, char, and air, and a combustion device composed of a plurality of burners 126 is arranged on the gasification furnace wall 111 of the combustor section 116. The high-temperature combustion gas obtained by burning the pulverized coal and a part of the char in the converter section 116 passes through the diffuser section 117 and flows into the reducer section 118.

The reducer section 118 is maintained at a high temperature state required for the gasification reaction, supplies pulverized coal to the combustion gas from the convertor section 116 and partially burns the pulverized coal to volatile components (carbon monoxide, hydrogen, lower hydrocarbons, etc.). ), Which is gasified to generate a generated gas, and a combustion device composed of a plurality of burners 127 is arranged on the gasification furnace wall 111 of the reducer portion 118.

The thin gas cooler 102 is provided inside the gasification furnace wall 111, and is provided above the burner 127 of the reducer portion 118 in the vertical direction. The thin gas cooler 102 is a heat exchanger, and the evaporator (evaporator) 131, the superheater (superheater) 132, and the nodes are in order from the lower side in the vertical direction (upstream side in the flow direction of the generated gas) of the gasification furnace wall 111. A charcoal (economizer) 134 is arranged. These thin gas coolers 102 cool the generated gas by exchanging heat with the generated gas generated in the reducer portion 118. Further, the number of the evaporator (evaporator) 131, the superheater (superheater) 132, and the economizer (economizer) 134 is not limited as shown in the figure.

Here, the operation of the gasification furnace equipment 14 described above will be described.
In the gasifier 101 of the gasifier facility 14, nitrogen and pulverized coal are charged and ignited by the burner 127 of the reducer portion 118, and the pulverized coal, char and compressed air (oxygen) are discharged by the burner 126 of the convertor portion 116. It is thrown in and ignited. Then, in the convertor section 116, high-temperature combustion gas is generated by combustion of pulverized coal and char. Further, in the convertor portion 116, molten slag is generated in high temperature gas by combustion of pulverized coal and char, and the molten slag adheres to the gasification furnace wall 111 and falls to the bottom of the furnace, and finally in the slug hopper 122. It is discharged to the water storage. Then, the high-temperature combustion gas generated in the converter section 116 rises to the reducer section 118 through the diffuser section 117. In this reducer unit 118, the pulverized coal is maintained at a high temperature state required for the gasification reaction, the pulverized coal is mixed with the high temperature combustion gas, and the pulverized coal is partially burned in a high temperature reducing atmosphere to carry out the gasification reaction, and the generated gas is produced. Is generated. The gasified generated gas flows from the lower side in the vertical direction to the upper side.

[Starting gasifier equipment]
Next, the activation of the gasifier equipment according to the embodiment of the present invention will be described. FIG. 3 is a schematic configuration diagram showing a steam drum, a circulation system, and a blow system used at the time of starting the gasification furnace equipment according to the embodiment of the present invention.

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

In the steam drum 21 shown in FIG. 3, water is supplied from the water supply system (not shown) during normal operation of the gasification furnace equipment 14, and water is supplied to each part 22 of the water system via the circulation system 24. .. During normal operation of the gasifier equipment 14, the steam in the steam drum 21 is supplied to the steam system 23. When the gasification furnace 101 is started, 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. 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 normal operation of the gasifier equipment 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 for receiving hot water generated by the exhaust heat recovery boiler 20, which will be described later. In the example of this embodiment, the hot water receiving section 26 is installed between the gasifier circulation pump 25 and each section 22 of the water system. The present invention is not limited to this example, and the hot water receiving unit 26 may be installed between each part 22 of the water system and the steam drum 21. The hot water receiving unit 26 is, for example, a manifold or the like.

During the start-up period of the gasifier 101, that is, from the state in which the gasifier equipment 14 is stopped until the carbon-containing solid fuel such as coal is charged into the gasifier 101 and ignited, the circulation system 24 is charged. The hot water generated by the exhaust heat recovery boiler (HRSG) 20 is supplied as warming water supply. This hot water is produced by, for example, a high-pressure economizer of the exhaust heat recovery boiler 20, and has a high temperature and high pressure. The hot water generated by the exhaust heat recovery boiler 20 is supplied to the 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 thin gas 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 gasifier equipment 14. To.

The main steam pipe 28 connects the steam system 23 and the exhaust heat recovery boiler 20, and the main steam generated in the steam system 23 (for example, superheated steam generated by a superheater) is discharged through the main steam pipe 28. It is supplied to the heat recovery steam 20. The main steam pipe 28 is provided with a main steam valve 29 for adjusting the steam pressure flowing through the main steam pipe 28 and a shutoff valve 30 for shutting off the flow of steam flowing through the main steam pipe 28. During normal operation of the gasification furnace equipment 14, the shutoff valve 30 is in a fully open state, and the steam pressure flowing through the main steam pipe 28 is adjusted by adjusting the opening degree 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) the surplus steam generated in the steam system 23 to the condenser 73. As a result, excess steam is discharged to the outside of the gasifier equipment 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 shutoff valve 33 that shuts off the flow of steam flowing through the steam dump system 31. During the normal operation of the gasification furnace equipment 14, the shutoff valve 33 is in the fully open state, 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 shutoff valve 33 are fully closed.

As a result, when the gasifier 101 is started, steam and nitrogen in the steam drum 21 do not leak to the downstream side of the steam system 23. Conventionally, the shutoff 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 deadline is low even when it is fully closed, and a fluid leak may occur in a high pressure environment. Therefore, when the steam drum 21 is pressurized by nitrogen when the gasifier 101 is started, if steam or nitrogen leaks to the downstream side of the steam dump valve 32, it is guided to the condenser 73 to restore water. It affected the decrease in the degree of vacuum of the vessel 73. On the other hand, by installing the shutoff valve 33, the steam and nitrogen in the steam drum 21 are surely prevented from leaking to the downstream side of the steam system 23, and the degree of vacuum 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. As a result, excess water is discharged to the outside of the system of the gasifier equipment 14 in both the normal operation of the gasifier equipment 14 and the start-up of the gasifier 101.

In the present embodiment, the pressurized nitrogen supplied from the air separation equipment 42 is used for pressurizing the inside of the steam drum 21 at the time of starting. The air separation equipment 42 is an example of the inert gas supply unit. The gas used for pressurization in the steam drum 21 at startup 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 equipment 42 generates nitrogen and supplies the generated nitrogen to the steam drum 21 when the gasifier 101 is started. Pressurized nitrogen is supplied into the steam drum 21. As a result, the inside of each part 22 of the water system of the circulation system 24 and the sink gas cooler 102 is also pressurized. Therefore, when the hot water receiving part 26 supplies the pressurized hot water from the exhaust heat recovery boiler 20, the pressurized hot water is used as a flow rate adjusting valve. On the downstream side of 38, the pressure drops significantly to below the saturation pressure and does not flush.

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

Further, in the condenser 73, the surplus steam is recovered through the steam dump system 31 and the surplus water is recovered through the blow system 34 during the normal operation of the gasifier equipment 14. Further, when the gasifier 101 is started, the condenser 73 is supplied with excess water via the blow system 34 and recovered.

The gas extraction device 35 is an example of a gas extraction unit, which extracts the gas in the condenser 73 and releases it to the atmosphere. The gas extraction device 35 extracts gas from the condenser 73 when the gasifier 101 is started, with an extraction amount larger than the extraction amount of the gas extracted from the condenser 73 during normal operation including the rated operation of the steam turbine 18. 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 as an ejector that utilizes the expansion energy of high-pressure steam generated by the exhaust heat recovery boiler 20. In a low vacuum region where the pressure inside the condenser 73 is higher than a predetermined pressure (for example, the pressure range where the atmospheric pressure shifts to the vacuum state), the gas inside the condenser 73 is discharged to the atmosphere by the water-sealed rotary vacuum pump 36. Will be done. At this time, the gas in the condenser 73 bypasses the ejector 37 and is sucked only by the water-sealed rotary vacuum pump 36. The operation using only the water-sealed rotary vacuum pump 36 is called a hogging operation.

In a high vacuum region where the pressure inside the condenser 73 is less than a predetermined pressure, the gas inside the condenser 73 is discharged to the atmosphere by the water-sealed 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-sealed rotary vacuum pump 36 to create a vacuum. The exhaust capacity is increased. The operation by the water-sealed rotary vacuum pump 36 and the ejector 37 is called a holding operation. As a result, a high vacuum state of less than a predetermined pressure can be maintained.

Next, the start-up operation of the gasification furnace equipment 14 according to the present embodiment will be described.
The start of the gasifier equipment 14 is a period from the state in which the gasifier equipment 14 is stopped until the carbon-containing solid fuel such as coal is charged into the gasifier 101 and ignited to raise the temperature to a predetermined temperature. Therefore, it is necessary to take measures as a start until the temperature inside the gasification furnace 101, at least at the outlet of the thin gas cooler 102, exceeds the acid dew point. After the start-up is completed, auxiliary fuel such as light oil is charged into the gasifier 101 and ignited.

When starting the gasification furnace equipment 14, first, fuel such as light oil is burned to drive the gas turbine 17, and the exhaust gas discharged from the gas turbine 17 is circulated with the exhaust heat recovery boiler 20 to be exhaust gas. Heat exchange takes place to produce hot water and steam. Since the exhaust heat recovery boiler 20 has a high water supply pressure to the boiler, high-pressure hot water and steam are generated. Further, the air separation equipment 42 is started, and nitrogen is generated by the air separation equipment 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 as warming water by adjusting the flow rate with the flow rate adjusting valve 38. 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 pressurized nitrogen generated by the air separation equipment 42 is supplied to the steam drum 21, and the circulation system 24 and each part 22 of the water system are applied to the pressure at which the hot water generated by the exhaust heat recovery boiler 20 does not flush. Maintained under pressure.

When the gasifier 101 is started, the excess water in the steam drum 21 is discharged (blowed) to the condenser 73 via the blow system 34, and the excess water is discharged to the outside of the gasifier equipment 14 system. Will be done. At this time, in the condenser 73, since the inside of the condenser 73 is in a depressurized state, a gas exceeding the solubility is discharged from the water supplied into the condenser 73. Therefore, the gas extraction device 35 extracts the gas in the condenser 73 and exhausts it to the atmosphere. When the gas extraction device 35 is started, 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 is larger than the extraction amount of the gas. Then, while performing the holding operation, gas is extracted from the condenser 73 and exhausted.

Further, when the gasifier 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 are fully closed. Is also fully closed. Since the steam dump valve 32 is a pressure regulating valve, even if it is fully closed, a fluid leak may occur in a high pressure environment. Therefore, when the steam drum 21 is pressurized by nitrogen when the gasifier 101 is started, the shutoff valve 33 is fully closed. As a result, steam and nitrogen in the steam drum 21 are surely prevented from leaking to the downstream side of the steam system 23.

As a result, each part 22 of the water system provided inside the gasification furnace 101 is supplied from the exhaust heat recovery boiler 20 to the steam drum 21 connected to each part 22 of the water system when the gasification furnace 101 is started. The pressurized hot water is circulated. As a result, when the gasifier 101 is started, the temperature inside the gasifier 101 rises. Further, 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 inside the gasifier 101 so that the internal temperature of the gasifier 101 is at least the acid dew point temperature or higher. It may be controlled by the regulating valve 38.

Further, when the gasifier 101 is started, pressurized nitrogen is supplied to the steam drum 21, and the insides of the circulation system 24 and each part 22 of the water system are also pressurized. When the pressurized hot water is supplied, the pressurized hot water becomes below the saturation pressure and does not flush. Therefore, it is not necessary to gradually increase the pressurized hot water supplied to the circulation system 24, and the start-up time can be shortened.

Further, the condenser 73 is provided at the outlet of the steam turbine 18 and is also connected to the steam drum 21, and water is supplied from the steam drum 21 when the gasifier 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 extracts gas from the condenser 73 when the gasifier 101 is started, with an extraction amount larger than the extraction amount of the gas extracted from the condenser 73 during normal operation including the rated operation of the steam turbine 18. Since it is extracted and exhausted, even if the nitrogen for pressurization is dissolved in the water supplied from the steam drum 21 to the condenser 73 and released by the condenser 73, the degree of vacuum in the condenser 73 is maintained. The degree of vacuum can be maintained without decreasing.

Therefore, the amount of pressurized hot water supplied to each part 22 of the water system at the time of starting the gasifier 101 can be increased according to the amount of gas extracted by the gas extraction device 35. Increasing the amount of pressurized hot water also increases the amount of nitrogen dissolved in the water, but as described above, it is possible to extract gas from the condenser 73 with a large extraction amount and exhaust it when the gasifier 101 is started. Therefore, the degree of vacuum in the condenser 73 can be maintained at a high level without lowering the degree of vacuum. Since the amount of pressurized hot water supplied to each part 22 of the water system increases when the gasifier 101 is started, the temperature inside the gasifier 101 rises faster and the start time of the gasifier 101 is further extended. Can be shortened.

Further, the temperature of the pressurized hot water supplied to each part 22 of the water system at the time of starting the gasifier 101 is raised according to the amount of gas extracted by the gas extraction device 35, or is supplied to the steam drum 21. It is also possible to increase the pressure of nitrogen produced. When the temperature of the pressurized hot water is increased or the pressure of nitrogen is increased, the dissolved amount of nitrogen in water also increases, but as described above, the gas is extracted from the condenser 73 with a large extraction amount when the gasifier 101 is started. Therefore, the degree of vacuum in the condenser 73 can be maintained at a high level. Since the temperature of the pressurized hot water supplied to each part 22 of the water system rises when the gasifier 101 is started, the temperature inside the gasifier 101 rises even faster, and the start-up time of the gasifier 101 Can be further shortened.

Next, a method of selecting the capacity of the gas extraction device 35 during the holding operation 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 from the steam turbine 18 by the condenser 73 during normal operation of the steam turbine 18. To.

On the other hand, the amount of gas (nitrogen) extracted at the time of starting the gasifier 101 by the gas extraction device 35 is determined as follows, for example.

Assuming the start-up time required for the temperature inside the gasifier 101 to exceed the acid dew point, the amount of hot water supplied from the exhaust heat recovery boiler 20, the hot water temperature, and the steam drum 21 are supplied so that the start-up time is the estimated start-up time. Determine the pressure of nitrogen to be used. 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 by the water temperature of the hot water and the pressure of nitrogen.

Then, in the condenser 73, the dissolved nitrogen evaporates beyond the solubility of water, so that the vacuum state is lowered. Therefore, in order to maintain the condenser 73 in a high vacuum state, the amount of gas (nitrogen) extracted when the gas extraction device 35 performs the holding operation at the start of the gasifier equipment 14 is the condenser 73. It is determined based on the amount of wastewater discharged to and the amount of nitrogen dissolved in it.

Therefore, according to the present embodiment, as the start-up time is shortened, 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. Then, as the amount of hot water supplied increases, the amount of drainage discharged from the steam drum 21 to the condenser 73 via the blow system 34 increases. Along with this, the amount of nitrogen discharged from the water discharged from the steam drum 21 to the condenser 73 also increases. Further, as the hot water temperature and the nitrogen pressure increase, the amount of nitrogen dissolved in the amount of wastewater discharged from the steam drum 21 to the condenser 73 via the blow system 34 increases. Therefore, in order to enable the condenser 73 to be maintained in a high vacuum state when the gasifier 101 is started, the amount of gas extracted and exhausted from the gas when the gas extraction device 35 performs the holding operation is also required. It rises as compared with the case where the 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. Extract and exhaust an extraction amount larger than the extraction amount of. Further, when the gasifier 101 is started, gas is extracted from the condenser 73 and exhausted while performing a holding operation. The amount of gas extracted at the time of starting the gasifier 101 is, for example, twice or more the amount of gas extracted during the holding operation 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 of the gas extraction devices 35 is extracted based on the determined amount of gas (nitrogen) extracted at the time of starting the gasifier 101. The capacity to be exhausted is determined. In this case, when the gasifier 101 is started, the gas extraction device 35 is operated in the rated operation, and in the normal operation including the rated operation of the steam turbine 18, the gas extraction device 35 is operated with the ability to extract and exhaust. To do.

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

The degree of vacuum of the condenser 73 was confirmed and determined when the gas extraction device 35 having the determined amount of gas (nitrogen) extracted at the start of the gasifier 101 was operated and when the gas extraction device 35 was commissioned. The amount of hot water supplied from the exhaust heat recovery boiler 20 to the circulation system 24 may be adjusted according to the ability of the gas extraction device 35 to extract and exhaust the gas.

This is because the gas extraction device 35 extracts gas from the condenser 73 when the gasifier 101 is started, 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 in the condenser 73 can be maintained high without lowering the degree of vacuum. Along with this, the amount and temperature of the pressurized hot water supplied to each part 22 of the water system at the time of starting the gasification furnace 101 can be increased, and the start-up time of the gasification furnace 101 can be further shortened.

As a result, when the gasification furnace 101 is started, the amount of fuel (light oil) consumed by the gas turbine and the time required to operate the air separation equipment 42 due to nitrogen generation can be reduced, and energy saving and cost reduction can be achieved. it can. In addition, the capacity of the storage facility for storing the fuel (light oil) used by the gas turbine when the gasifier 101 is started can be reduced.

Further, when the steam drum 21 is pressurized by nitrogen when the gasifier 101 is started, 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 surely prevented. Therefore, it is possible to prevent the vacuum state of the condenser 73 from being lowered.

In the above-described embodiment, coal is used as fuel, but high-grade coal and low-grade coal can also be applied, and it is not limited to coal and is used as a renewable organic resource derived from living organisms. It may be biomass to be produced, and for example, thinned wood, waste wood, drifting wood, grass, waste, sludge, tires, and recycled fuel (pellets and chips) made from these can also be used. ..

Further, in the present embodiment, the tower type gasification furnace has been described as a gasification furnace, but even if the gasification furnace 101 is a crossover type gasification furnace, the gas generated in the vertical vertical direction of each device in the gasification furnace 101. By replacing the gas flow direction of the above so as to match, the same implementation is possible.

10: Coal gasification combined cycle equipment 11: Coal supply equipment 11a: Coal supply line 14: Gasification furnace equipment 15: Char recovery equipment 16: Gas purification equipment 17: Gas turbine 18: Steam turbine 19: Generator 20: Exhaust 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: Gasification furnace circulation pump 26: Hot water receiving section 27: Steam supply pipe 28: Main steam pipe 29: Main steam valve 30: Shutoff valve 31: Steam dump system 32: Steam dump valve 33: Shutoff 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 matter 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: Thin gas cooler 110: Pressure vessel 111: Gasification furnace wall 115: Anuras section 116: Turbine section 117: Diffuser section 118: Reductor section 121: Gas outlet 122: Slug hopper 126: Burner 127: Burner 131: Evaporator 132: Superheater 134: Coal saving device 154: Internal space 156: External space

Claims (6)

Gasifier and
A water system heat exchanger provided inside the gasifier and
With the steam drum connected to the water system heat exchanger,
A hot water supply unit that supplies pressurized hot water to the water system heat exchanger,
A circulation system in which the water system heat exchanger and the steam drum are connected and the hot water circulates between the water system heat exchanger and the steam drum.
An inert gas supply unit that supplies the pressurized inert gas to the steam drum,
A condenser that is provided at the outlet of the steam turbine, is connected to the steam drum, and water is supplied from the steam drum.
A gas extraction unit connected to the condenser to extract and exhaust the gas in the condenser,
With
At the start of the gasification furnace, the gas extraction unit condenses the gas containing the inert gas dissolved in the water supplied from the steam drum with an extraction amount larger than that during the rated operation of the steam turbine. by extracting from the vessel exhaust, gasifier facility and maintains the vacuum condition of the condenser. The gas extractor
With a vacuum pump
With the ejector
Have,
When the pressure is equal to or higher than the predetermined pressure, the hogging operation is performed only by the vacuum pump, and when the pressure is lower than the predetermined pressure, the holding operation is performed by the vacuum pump and the ejector.
The gas extraction unit has an extraction amount larger than the extraction amount of the gas extracted from the condenser during the holding operation during the rated operation of the steam turbine, and the holding at the start of the gasification furnace. The gasifier facility 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 each unit has a capacity for extracting gas to be extracted from the condenser, which can perform the holding operation during the rated operation of the steam turbine.
The gasification furnace equipment according to claim 2, wherein when the holding operation is performed at the start of the gasification furnace, the gas extraction unit is operated by two or more units. A steam system heat exchanger provided inside the gasifier and through which steam supplied from the steam drum flows after the start of the gasifier is completed.
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-up of the gasifier is completed.
A regulating valve provided in the dump system and adjusting the flow rate of steam flowing through the dump system,
In the dump system, a shutoff valve provided on the condenser side of the regulating valve to shut off the flow of steam flowing through the dump system at least when the gasifier is started.
The gasifier equipment according to any one of claims 1 to 3, further comprising. The gasifier equipment according to any one of claims 1 to 4, which produces a generated gas 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 gasification furnace equipment, and
A steam turbine that is rotationally driven by steam containing steam generated by an exhaust heat recovery boiler that introduces turbine exhaust gas discharged from the gas turbine, and
A gasification combined cycle facility including the gas turbine and a generator connected to the steam turbine. A method of starting a gasifier facility including a gasifier, a water system heat exchanger provided inside the gasifier, and a steam drum connected to the water system heat exchanger.
When the gasifier is started, a step of supplying pressurized hot water to the water system heat exchanger and
In the circulation system connecting the water system heat exchanger and the steam drum, the step in which the hot water circulates between the water system heat exchanger and the steam drum,
When the gasifier is started, the step of supplying the pressurized inert gas to the steam drum and
A step in which a condenser connected to the steam drum while being provided at the outlet of the steam turbine recovers water from the steam drum when the gasifier is started.
When the gasifier is started, the gas extraction unit connected to the condenser is extracted from the steam drum with an extraction amount larger than the amount of gas extracted from the condenser during the rated operation of the steam turbine. a gas comprising an inert gas that has been dissolved in the supplied water to extract and exhausted from the condenser, maintaining a vacuum condition of the condenser,
A method of starting a gasifier facility, which is characterized by being equipped with.

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