JP2010121461A - Combined power generating method and device using twin tower gasification device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a total electric generating capacity including an electric generating capacity of a steam turbine electric generator and an electric generating capacity of a gas turbine electric generator or fuel cell to stably follow the increase or decrease in a target load. <P>SOLUTION: In a combined power generating method, when the increase or decrease of the target load 26 is commanded, a stable operation control for increasing or decreasing the total electric generating capacity is performed by increasing or decreasing a raw material supply of a raw material supplier 17, a steam supply of a steam supply valve 18 and a water supply of a water feed pump 13 on the basis of a target load 26. At the same time, the electric generating capacity of a steam turbine electric generator 16 is increased or decreased prior to the electric generating capacity of the gas turbine electric generator or a fuel cell 20 by increasing or decreasing the opening degree of a steam governor 15 and therefore quickly increasing or decreasing the electric generating capacity of the steam turbine electric generator 16 while increasing or decreasing supply of an auxiliary fuel 23 of an auxiliary fuel supplier 24, supply of the water feed pump 13, and steam generation of an exhaust heat recovery boiler 12. Therefore, the total electric generating capacity follows the target load 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is based on a two-column gasifier that can reliably follow the power generation amount of the steam turbine power generation device and the total power generation amount of the gas turbine power generation device or the power generation amount of the fuel cell as the target load increases or decreases. The present invention relates to a combined power generation method and apparatus.

  Conventionally, coal gasification combined power plants are equipped with means to temporarily increase or decrease the amount of steam supplied to the steam turbine when the load increases or decreases, and to correct the steam turbine power generation in advance. Yes (see Patent Document 1).

In Patent Document 1, since the gas pressure supplied from the gasifier is accompanied by a large delay, there is a drawback that the gas pressure fluctuates greatly particularly when the load changes. For this reason, as described above, the load increase is increased.・ It is said that load followability can be improved by temporarily increasing / decreasing the amount of steam supplied to the steam turbine at the time of decrease, and correcting the power generation amount of the steam turbine power generator in advance.
Japanese Patent Laid-Open No. 04-027702

  As shown in FIG. 6 of Patent Document 1, the coal gasification combined power plant shown in Patent Document 1 supplies fuel gas generated in the gasification furnace to the gas turbine power generator to generate power, The exhaust gas at the outlet of the gas turbine power generator is directed to the exhaust heat recovery boiler to generate steam, and this steam is supplied to the steam turbine power generator to generate power. Since the amount of fuel gas generated in the gasification furnace cannot be increased quickly, the output of the steam turbine power generator is increased in advance. It is described that the temporary increase in the amount does not cause a problem because the amount of steam retained in the steam system is sufficiently large.

  However, in the coal gasification combined power plant shown in Patent Document 1, since the generated steam amount cannot be changed immediately, power is generated by simply opening the steam governor and increasing the steam supply amount to the steam turbine power generator. If an attempt is made to increase the volume, the steam pressure will drop immediately. For this reason, in Patent Document 1, there is a problem that the control for temporarily increasing the power generation amount of the steam turbine power generation apparatus can be handled only for a very short time.

  In addition, even when the operation of increasing the amount of raw material supplied to the gasifier is performed at the same time when the load is temporarily increased, the delay in the gas pressure of the fuel gas led to the gas turbine is large, as described above. It takes time until the amount of power generated by the gas turbine power generator increases. Therefore, when the load increases temporarily, the total power generated by the gas turbine power generator and the power generated by the steam turbine power generator is used as the target load. There is a problem that it is difficult to follow along, and therefore load followability cannot be improved.

  The present invention is based on a two-column gasifier that can reliably follow the increase or decrease in the target load between the power generation amount of the steam turbine power generation device and the power generation amount of the gas turbine power generation device or the fuel cell. An object is to provide a combined power generation method and apparatus.

The present invention has a combustion furnace and a gasification furnace, supplies the fluidized medium heated in the combustion furnace to the gasification furnace, gasifies the raw material using the heat of the fluidized medium, generates fuel gas, A two-column gasification furnace in which the fluid medium is heated by introducing the fluid medium and unreacted char into the combustion furnace to burn the char, and at least the exhaust gas from the combustion furnace is introduced and the feed water pump An exhaust heat recovery boiler that generates steam by exchanging heat with water from the steam, a steam turbine power generator that generates power by introducing the steam from the exhaust heat recovery boiler through a steam governor, and a raw material for the gasifier A raw material supply device to be supplied, a steam supply valve for supplying a part of the steam from the exhaust heat recovery boiler to the gasification furnace as a gasifying agent, and fuel gas generated in the gasification furnace is introduced through a gas governor to generate power A gas turbine generator or Charge battery and, a combined cycle power generation method according to the double column gasifier with the auxiliary fuel supply device for supplying auxiliary fuel to said combustion furnace,
Based on the target load, the amount of raw material supplied by the raw material supply device, the amount of steam supplied by the steam supply valve, and the amount of water supplied by the feed water pump are controlled to generate the power generated by the steam turbine power generator and the power generated by the gas turbine power generator or fuel cell. A load follower that controls stable operation to maintain the total power generation amount balanced with
When a command to increase or decrease the target load is issued, increase or decrease of the raw material supply amount by the raw material supply device, increase or decrease of the steam supply amount by the steam supply valve based on the target load, and the amount of water supply by the feed pump Perform stable operation control to increase or decrease total power generation by increasing or decreasing,
At the same time, the amount of power generated by the steam turbine generator is increased or decreased immediately by increasing or decreasing the opening of the steam governor, the amount of auxiliary fuel supplied or increased by the auxiliary fuel supply device, and the amount of water supplied by the water supply pump. The amount of steam generated by the exhaust heat recovery boiler is increased / decreased to increase / decrease the amount of power generated by the steam turbine power generation system, and the total power generation follows the target load. The present invention relates to a combined power generation method using a two-column gasifier.

  In the combined power generation method using the two-column gasifier, it is preferable to introduce the exhaust gas at the gas turbine power generator outlet into the exhaust heat recovery boiler to perform heat exchange to increase the amount of exhaust heat recovery by the exhaust heat recovery boiler.

  Further, in the combined power generation method using the two-column gasifier, it is preferable to introduce the fuel gas from the gasifier into the exhaust heat recovery boiler and perform heat exchange to increase the amount of exhaust heat recovered by the exhaust heat recovery boiler. .

The present invention has a combustion furnace and a gasification furnace, supplies the fluidized medium heated in the combustion furnace to the gasification furnace, gasifies the raw material using the heat of the fluidized medium, generates fuel gas, A two-column gasification furnace in which the fluid medium is heated by introducing the fluid medium and unreacted char into the combustion furnace to burn the char, and at least the exhaust gas from the combustion furnace is introduced and the feed water pump An exhaust heat recovery boiler that generates steam by exchanging heat with water from the steam, a steam turbine power generator that generates power by introducing the steam from the exhaust heat recovery boiler through a steam governor, and a raw material for the gasifier A raw material supply device to be supplied, a steam supply valve for supplying a part of the steam from the exhaust heat recovery boiler to the gasification furnace as a gasifying agent, and fuel gas generated in the gasification furnace is introduced through a gas governor to generate power A gas turbine generator or Charge batteries and a composite power generating apparatus according to the double column gasifier with the auxiliary fuel supply device for supplying auxiliary fuel to said combustion furnace,
Based on the target load, the raw material supply amount command by the raw material supply device, the steam supply amount command by the steam supply valve, and the water supply amount command by the feed water pump are issued, and the power generation amount by the steam turbine power generation device and the gas turbine power generation device or fuel cell It has a load follower with a stable operation controller that controls to maintain the total power generation amount balanced with the power generation amount by
When the target load increases / decreases, the load follower issues a raw material control signal for increasing / decreasing the raw material supply amount by the raw material supply device and a steam control signal for increasing / decreasing the steam supply amount by the steam supply valve. Gas side command means to increase / decrease total power generation in stable operation state,
Steam governor opening adjustment signal for increasing / decreasing the opening of the steam governor, auxiliary fuel adjustment signal for increasing / decreasing the amount of auxiliary fuel supplied by the auxiliary fuel supply device, and amount of water supplied for increasing / decreasing the amount of water supplied by the water supply pump The present invention relates to a combined power generation apparatus using a two-column gasifier, comprising: a steam-side command unit that issues an adjustment signal and precedes an increase or decrease in the amount of power generated by the steam turbine power generation apparatus.

  In the combined power generator using the two-column gasifier, it is preferable that exhaust gas at the outlet of the gas turbine power generator is led to an exhaust heat recovery boiler.

  In the combined power generation apparatus using the two-column gasifier, it is preferable that the fuel gas generated in the gasification furnace is led to an exhaust heat recovery boiler.

  According to the combined power generation method and apparatus using the two-column gasifier of the present invention, when an increase / decrease in the target load is commanded, an increase / decrease in the amount of raw material supply by the raw material supply device based on the target load, Stable operation control to increase / decrease the total power generation by increasing / decreasing the amount of steam supplied by the steam supply valve and increasing / decreasing the amount of water supplied by the water supply pump, and at the same time increase / decrease the opening of the steam governor In addition to immediately increasing / decreasing the amount of power generated by the steam turbine power generator, increasing / decreasing the amount of auxiliary fuel supplied by the auxiliary fuel supply device, and increasing / decreasing the amount of water supplied by the feed water pump, the waste heat recovery boiler By increasing or decreasing the amount of steam generated, the total amount of power generation is made to follow the target load by increasing or decreasing the amount of power generation by the steam turbine power generation device. Power generation by equipment Immediately Moreover it is possible to increase stably for a long time, thus an excellent effect can reliably follow the total power generation amount with respect to the target load.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing an example of an embodiment of the present invention. In FIG. 1, 1 is a two-column gasifier. The two-column gasification furnace 1 includes a combustion furnace 2 and a gasification furnace 3, and the fluidized medium 4 heated in the combustion furnace 2 is separated from the exhaust gas 6 by a cyclone separator 5 to be gas. The raw material 7 supplied to the gasification furnace 3 and supplied to the gasification furnace 3 by the heat of the fluidizing medium 4 is gasified together with the steam 8 to generate a fuel gas 9, and the fluid medium in the gasification furnace 3 and unreacted char Is introduced into the combustion furnace 2 through the supply passage 10 and the char is burned together with the air 11 to heat the fluid medium.

  In FIG. 1, reference numeral 12 denotes an exhaust heat recovery boiler that is introduced from the combustion furnace 2 and into which the exhaust gas 6 from which the fluidized medium 4 is separated by the separator 5 is introduced. The supplied water 14 is heat-exchanged with the exhaust gas 6 to generate steam 8, and the steam 8 generated in the exhaust heat recovery boiler 12 is supplied to the steam turbine power generator 16 via the steam governor 15. Introduced to generate electricity.

  The gasification furnace 3 is provided with a raw material supply device 17 for supplying a raw material 7 made of coal or other carbonaceous fuel, and a part of the steam 8 generated in the exhaust heat recovery boiler 12 is gasified. A steam supply valve 18 supplied as an agent is provided, and the fuel gas 9 generated in the gasification furnace 3 is introduced into a gas turbine power generator or a fuel cell 20 via a gas governor 19 to generate power. Here, it is preferable to introduce the fuel gas 9 from the gasification furnace 3 into the exhaust heat recovery boiler 12 to recover the exhaust heat and to cool the fuel gas 9, and to cool the fuel gas 9. It is preferable to introduce exhaust gas 22 into the exhaust heat recovery boiler 12 to recover exhaust heat. Further, a gas purifier 21 for purifying the fuel gas 9 may be provided as necessary, and the purified fuel gas 9 may be supplied to the gas turbine power generator or the fuel cell 20.

  The combustion furnace 2 is provided with an auxiliary fuel supply device 24 that supplies and burns an auxiliary fuel 23 such as coal or LPG when the two-column gasifier 1 is started.

  In FIG. 1, reference numeral 25 denotes a load following device. A target load 26 (MWD) is input to the load following device 25, and a detector 27 and a gas turbine that detect the amount of power generated by the steam turbine power generation device 16. The power generation amount detection signals 27a and 28a from the detector 28 for detecting the power generation amount by the power generation device or the fuel cell 20 are input.

  In the load follower 25, a raw material supply command 29 to be sent to the raw material supply device 17 based on the target load 26, a steam supply command 30 to be sent to the steam supply valve 18, a water supply command 31 to be sent to the water supply pump 13, and Further, the gas governor opening command 32a to be sent to the gas governor 192 and the steam governor opening command 32b to be sent to the steam governor are issued so that the power generation amount by the steam turbine power generation device 16 and the power generation amount by the gas turbine power generation device or the fuel cell 20 are balanced. A stable operation controller 33 is provided for performing stable control so as to obtain the total power generation amount. When the target load 26 increases or decreases, the stable operation controller 33 changes each command 29, 30, 31, 32a, 32b while maintaining stable operation.

  Further, the load follower 25 includes a steam governor opening adjustment signal 34 for increasing / decreasing the opening of the gas governor 19 when the target load 26 increases / decreases, and an auxiliary fuel supply amount by the auxiliary fuel supply device 24. Steam advance command means 37 is provided for issuing an auxiliary fuel adjustment signal 35 for increasing / decreasing and a water supply amount adjusting signal 36 for increasing / decreasing the amount of water supplied by the water supply pump 13.

  The operation of the above embodiment will be described below.

  Based on the target load 26, the stable operation controller 33 of the load following device 25 includes a raw material supply command 29 for the raw material supply device 17, a steam supply command 30 for the steam supply valve 18, and a water supply command 31 for the water supply pump 13. At the same time, the gas governor opening command 32a for the gas governor 19 and the steam governor opening command 32b for the steam governor are issued. A stable control is always performed so that the total power generation amount matches the target load 26 in a balanced manner.

  Here, the raw material supply amount command 29 for controlling the raw material supply device 17 during stable operation can be calculated using a table or the like created from values according to the material balance in a combined power plant designed in advance. That is, as shown in FIG. 2, the raw material supply amount to the gasification furnace 3 during the stable operation of the combined power plant, the fuel gas generation amount generated in the gasification furnace 3, and the exhaust heat recovery boiler 12 are generated. The relationship between the amount of steam generation is uniquely determined. More specifically, the amount of power generated by the gas turbine power generation device or the fuel cell 20 with respect to the raw material supply amount, the exhaust gas 6 from the separator 5, the exhaust gas 22 at the outlet of the gas turbine power generation device 20, and the exhaust gas for heat exchange with the fuel gas 9. Since the relationship with the amount of power generated by the steam turbine power generation device 16 that generates power using the steam 8 from the heat recovery boiler 12 can be obtained in advance, by searching these relationships in a table, an arbitrary target load 26 can be obtained. On the other hand, a raw material supply amount command 29 that can be stably operated can be calculated, and the combined power plant can be stably operated using the raw material supply amount command 29.

  FIG. 3 is a control flowchart of the load following device 25. When the load increase command I for which the target load 26 is larger than the total power generation amount is issued, the stable operation controller 33 of the load follower 25 instructs the material supply device 17 to instruct the material supply device 17 as shown in step S1. 29, an increase in the steam supply command 30 commanded to the steam supply valve 18, and an increase in the water supply command 31 commanded to the feed pump 13, and in addition to this, the gas governor opening commanded to the gas governor 19 is performed. The stable operation command is changed by increasing the degree command 32a and increasing the steam governor opening degree command 32b commanded to the steam governor 15, thereby increasing the total power generation amount of the entire plant in a stable operation state. To be controlled.

  However, as described above, even if the raw material supply amount is increased in accordance with the stable operation command, the raw material 7 supplied to the gasification furnace 3 is gasified and the pressure (supply amount) of the fuel gas 9 rises slowly. Since it takes time until the amount of power generated by the gas turbine power generation device or the fuel cell 20 increases, as shown in FIG. 4, the total power generation amount A by the stable operation command is delayed with respect to the load increase command I. End up.

  Therefore, when the load increase command I is issued, the stable operation command is changed as shown in step S1 of FIG. 3, and the opening degree of the steam governor 15 is set by the steam advance command means 37 as shown in step S2. The steam governor opening degree adjustment signal 34 is increased to immediately increase the amount of power generated by the steam turbine power generator 16, the steam 8 consumed by the steam turbine power generator 16, and the steam consumed by the gasifier 3. The water supply amount adjustment signal 36 is issued to the water supply pump 13 so as to supply the water 14 corresponding to the increased amount of 8, and the auxiliary fuel 23 necessary for obtaining the heat amount corresponding to the increased amount of the steam 8 is supplied to the combustion furnace 2. An auxiliary fuel adjustment signal 35 is issued to the auxiliary fuel supply device 24 so as to supply to the auxiliary fuel supply device 24.

  As described above, when the opening degree of the steam governor 15 is increased, the amount of steam supplied to the steam turbine power generator 16 immediately increases, so that the amount of power generated by the steam turbine power generator 16 is immediately increased. Here, when the opening degree of the steam governor 15 is increased, the steam in the exhaust heat recovery boiler 12 is decreased and the steam pressure is decreased, and thus the power generation amount by the steam turbine power generation device 16 may be decreased. The steam pressure is immediately recovered by the rise of the exhaust heat temperature of the exhaust gas 6 derived from the auxiliary fuel 23 supplied to the combustion furnace 2, so that the amount of power generated by the gas turbine power generator or the fuel cell 20 increases. As shown by hatching in FIG. 4, the delay until completion is filled with the compensated power generation amount B due to the increase in the power generation amount of the steam turbine power generation device 16, and thus the total power generation amount is reliably increased following the load increase command I be able to. When the gasification of the raw material 7 with the increased supply amount is stabilized and the power generation amount by the gas turbine power generation device or the fuel cell 20 is close to the target value by the stable operation, the opening degree of the steam governor 15 is decreased and the auxiliary fuel 23 is supplied. The stable operation control is performed so that the target load after the change shown in FIG.

  As described above, when the load increase command I for the target load 26 is issued, the steam governor 15 is opened to immediately increase the supply amount of the steam 8 to the steam turbine power generator 16 and the auxiliary fuel supply device 24 burns. Since the auxiliary fuel 23 is supplied to the furnace 2 to raise the temperature of the exhaust gas 6, the power generation amount of the steam turbine power generator 16 can be increased immediately and stably over a long period of time. Thus, the load followability can be improved by reliably following the total power generation amount to the load increase command I.

  On the other hand, in FIG. 3, when a load lowering command II in which the target load 26 is smaller than the total power generation amount is issued, the stable operation controller 33 of the load following device 25 instructs the raw material supply device 17 as in step S3. The raw material supply amount command 29 to be reduced, the steam supply amount command 30 to be instructed to the steam supply valve 18, and the water supply amount command 31 to be instructed to the water supply pump 13 are further reduced. The stable operation command is changed by decreasing the gas governor opening degree command 32a commanded to the steam governor 15 and decreasing the steam governor opening degree command 32b commanded to the steam governor 15, whereby the total power generation amount of the entire combined power plant is reduced. It is controlled to decrease in a stable operation state.

  However, when the raw material supply amount is decreased in accordance with the stable operation command as described above and the total power generation amount of the entire plant is decreased in a stable state, the change of the fuel gas 9 from the gasification furnace 3 is slow. For this reason, the power generation amount of the steam turbine power generation device 16 decreases with a delay, and therefore the reduction of the total power generation amount is delayed with respect to the load lowering command II.

  Therefore, when the load lowering command II is issued, the stable operation command is changed in step S3 shown in FIG. 3, and the opening degree of the steam governor 15 is set by the steam advance command means 37 as shown in step S4. A decreasing steam governor opening adjustment signal 34 is issued to immediately reduce the amount of power generated by the steam turbine power generator 16, and the steam 8 consumed in the steam turbine power generator 16 and the steam 8 consumed in the gasifier 3 described above. A water supply amount adjustment signal 36 is issued to the water supply pump 13 so as to decrease the supply amount of the water 14 corresponding to the decrease, and further, the supply amount of the auxiliary fuel 23 for obtaining the heat amount corresponding to the decrease of the steam 8 is decreased. An auxiliary fuel adjustment signal 35 is issued to the auxiliary fuel supply device 24. Thereby, the total power generation amount of the entire plant stably follows the load lowering command II. If the steam 8 generated by the exhaust heat recovery boiler 12 becomes excessive when the load lowering command II is issued, it may be condensed and supplied to the exhaust heat recovery boiler 12 again. , It may be discharged to the outside.

  In FIG. 3, the case where the target load 26 is controlled separately when the target load 26 is large and small with respect to the total power generation amount is illustrated, but in the transient response processing, | total power generation amount−target load |> allowable value As described above, the control may be performed only when the difference between the target load 26 and the total power generation amount exceeds the allowable value.

  Furthermore, the supply of the auxiliary fuel 23 to the combustion furnace 2 by the auxiliary fuel supply device 24 may be controlled so that the supply amount of the auxiliary fuel 23 is always increased and increased during the stable operation control. The auxiliary fuel 23 may be supplied only when the load increase command I is issued.

  In the above embodiment, the auxiliary fuel 23 is supplied to the combustion furnace 2 to increase / decrease the amount of exhaust heat recovered by the exhaust heat recovery boiler 12 to increase / decrease the amount of power generated by the steam turbine power generator 16. However, as a means for increasing or decreasing the amount of exhaust heat recovery in the exhaust heat recovery boiler 12, instead of increasing or decreasing the auxiliary fuel 23, or in addition to increasing or decreasing the auxiliary fuel 23, the amount of char supplied to the combustion furnace 2 The amount of char supplied may be increased or decreased by increasing or decreasing the amount of raw material 7 to be charged into the gasification furnace 3.

  In addition, this invention is not limited only to the said form, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

It is a block diagram which shows an example of the form which implements this invention. It is a diagram which shows the concept of the relationship between the raw material supply amount with respect to the gasification furnace in the time of a stable operation, the fuel gas production amount produced | generated with a gasification furnace, and the steam generation amount generate | occur | produced with an exhaust heat recovery boiler. It is a control flowchart of a load following device. It is a diagram which shows the concept of the driving | running method by this invention when the load increase command of target load is issued.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Two tower type gasification furnace 2 Combustion furnace 3 Gasification furnace 4 Fluid medium 6 Exhaust gas 7 Raw material 8 Steam 9 Fuel gas 12 Exhaust heat recovery boiler 13 Feed water pump 14 Water 15 Steam governor 16 Steam turbine power generator 17 Raw material supply apparatus 18 Steam supply valve 19 Gas governor 20 Gas turbine power generator or fuel cell 22 Exhaust gas 23 Auxiliary fuel 24 Auxiliary fuel supply device 25 Load follower 26 Target load 29 Raw material supply amount command 30 Steam supply amount command 31 Water supply amount command 33 Stable operation controller 34 Steam governor opening adjustment signal 35 Auxiliary fuel adjustment signal 36 Water supply amount adjustment signal 37 Steam advance command means

Claims (6)

It has a combustion furnace and a gasification furnace, supplies the fluid medium heated in the combustion furnace to the gasification furnace, gasifies the raw material using the heat of the fluid medium, generates fuel gas, A two-column gasification furnace in which the fluid medium is heated by introducing the char of the reaction into the combustion furnace and burning the char; and at least the exhaust gas from the combustion furnace and the water from the feed water pump An exhaust heat recovery boiler that generates steam by heat exchange, a steam turbine power generator that generates power by introducing the steam from the exhaust heat recovery boiler through a steam governor, and a raw material supply that supplies the gasifier with the raw material An apparatus, a steam supply valve for supplying a part of the steam from the exhaust heat recovery boiler to the gasification furnace as a gasification agent, and a gas turbine for generating power by introducing the fuel gas generated in the gasification furnace through a gas governor With power generator or fuel cell A combined cycle power generation method according to the double column gasifier with the auxiliary fuel supply device for supplying auxiliary fuel to said combustion furnace,
Based on the target load, the amount of raw material supplied by the raw material supply device, the amount of steam supplied by the steam supply valve, and the amount of water supplied by the feed water pump are controlled to generate the power generated by the steam turbine power generator and the power generated by the gas turbine power generator or fuel cell. A load follower that controls stable operation to maintain the total power generation amount balanced with
When a command to increase or decrease the target load is issued, increase or decrease of the raw material supply amount by the raw material supply device, increase or decrease of the steam supply amount by the steam supply valve based on the target load, and the amount of water supply by the feed pump Perform stable operation control to increase or decrease total power generation by increasing or decreasing,
At the same time, the amount of power generated by the steam turbine generator is increased or decreased immediately by increasing or decreasing the opening of the steam governor, the amount of auxiliary fuel supplied or increased by the auxiliary fuel supply device, and the amount of water supplied by the water supply pump. The amount of steam generated by the exhaust heat recovery boiler is increased / decreased to increase / decrease the amount of power generated by the steam turbine power generation system, and the total power generation follows the target load. A combined power generation method using a two-column gasifier.   The two-column gasifier according to claim 1, wherein the exhaust gas at the outlet of the gas turbine power generator is introduced into an exhaust heat recovery boiler for heat exchange to increase the amount of exhaust heat recovery by the exhaust heat recovery boiler. By combined power generation method.   The two-column gasification according to claim 1 or 2, wherein fuel gas from the gasification furnace is introduced into an exhaust heat recovery boiler and heat exchange is performed to increase an amount of exhaust heat recovery by the exhaust heat recovery boiler. A combined power generation method using a device. It has a combustion furnace and a gasification furnace, supplies the fluid medium heated in the combustion furnace to the gasification furnace, gasifies the raw material using the heat of the fluid medium, generates fuel gas, A two-column gasification furnace in which the fluid medium is heated by introducing the char of the reaction into the combustion furnace and burning the char; and at least the exhaust gas from the combustion furnace and the water from the feed water pump An exhaust heat recovery boiler that generates steam by heat exchange, a steam turbine power generator that generates power by introducing the steam from the exhaust heat recovery boiler through a steam governor, and a raw material supply that supplies the gasifier with the raw material An apparatus, a steam supply valve for supplying a part of the steam from the exhaust heat recovery boiler to the gasification furnace as a gasification agent, and a gas turbine for generating power by introducing the fuel gas generated in the gasification furnace through a gas governor With power generator or fuel cell A combined cycle power generation system according to the double column gasifier with the auxiliary fuel supply device for supplying auxiliary fuel to said combustion furnace,
Based on the target load, the raw material supply amount command by the raw material supply device, the steam supply amount command by the steam supply valve, and the water supply amount command by the feed water pump are issued, and the power generation amount by the steam turbine power generation device and the gas turbine power generation device or fuel cell It has a load follower with a stable operation controller that controls to maintain the total power generation amount balanced with the power generation amount by
When the target load increases / decreases, the load follower issues a raw material control signal for increasing / decreasing the raw material supply amount by the raw material supply device and a steam control signal for increasing / decreasing the steam supply amount by the steam supply valve. Gas side command means to increase / decrease total power generation in stable operation state,
Steam governor opening adjustment signal for increasing / decreasing the opening of the steam governor, auxiliary fuel adjustment signal for increasing / decreasing the amount of auxiliary fuel supplied by the auxiliary fuel supply device, and amount of water supplied for increasing / decreasing the amount of water supplied by the water supply pump And a steam-side command unit that issues an adjustment signal to cause an increase or decrease in the amount of power generated by the steam turbine power generation device in advance.   The combined power generation apparatus using a two-column gasifier according to claim 4, wherein the exhaust gas at the gas turbine power generation apparatus outlet is guided to an exhaust heat recovery boiler.   6. The combined power generation apparatus using a two-column gasifier according to claim 4, wherein the fuel gas generated in the gasification furnace is guided to an exhaust heat recovery boiler.

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