JP4485900B2 - Gasification combined power generation facility and control method thereof - Google Patents

Description

  The present invention relates to a combined gasification power generation facility that integrates a gasification facility and a combined power generation facility, and a control method thereof.

In recent years, IGCC (Integrated Gasification Combined Cycle) has attracted attention as a combined gasification power generation facility that integrates a gasification facility and a combined power generation facility (a combination of a gas turbine and a steam turbine). This IGCC removes heavy metals, sulfur, etc. contained in raw materials such as residual oil, coal, etc., as fuel for gas turbines during the synthesis gas production process, and uses them as clean fuel gas equivalent to natural gas. It is highly evaluated as a next-generation power generation facility that is environmentally friendly.
In general, in this type of system, raw materials such as residual oil and coal are gasified in a gasification furnace, and then harmful substances are removed and converted into clean fuel gas using a gas treatment facility. Power generation with a gas turbine.

  In such a system, as a control method, a gasification furnace is controlled so as to produce a required amount of fuel gas in response to the demand on the power generation facility side, and the gas turbine is made to follow the produced fuel gas. There is a gas turbine lead system, a gas turbine that controls the gas turbine to generate the required amount of power to meet the demand of the power generation load, and supplies the synthesis gas necessary for the operation of this gas turbine from the gasifier, Recently, in order to quickly follow the fluctuations in the power generation load demand, a cooperative control method is adopted in which the gasification furnace lead method and the turbine lead method are combined to perform feedforward control of the gasification furnace.

Here, the cooperative control method will be described.
As shown in FIG. 3, the combined gasification power generation facility has a gasification process unit 1 that gasifies fuel and a combined power generation process unit 2 that generates power with a gas turbine using the fuel gas from the gasification process unit 1. is doing.
The fuel control valve 3 provided in the fuel supply pipe to the gasification process unit 1 is connected to a gasification process controller 5 to which a set value is sent from the gas pressure setting device 4, and the fuel control valve 3 is Control is performed based on a control signal from the gasification process controller 5. The gasification process controller 5 calculates a control value from the detection signal from the gas pressure detector 6 that detects the gas pressure in the gasification process unit 1 and the set value from the gas pressure setter 4, and supplies the control value to the fuel control valve 3. Output a control signal.
The gas control valve 7 provided in the gas supply pipe to the combined power generation process unit 2 is connected to a power generation process controller 9 to which a set value from the power generation load setting device 8 is sent. Control is performed based on a control signal from the power generation process controller 9. The power generation process controller 9 calculates a control value from the detection signal from the power generation output detector 10 that detects the power generation output in the combined power generation process unit 2 and the set value from the power generation load setting unit 8, and controls the gas control valve 7. Output a signal.

  And in said gasification combined cycle power generation equipment, when performing a cooperative control system, the feedforward calculating unit 11 is provided, the setting value from the power generation load setting unit 8 is transmitted to this feedforward calculating unit 11, and this feedforward calculating unit 11 A feedforward control signal is transmitted from the calculator 11 to the fuel control valve 3. As a result, the amount of fuel supplied to the gasification process unit 1 is increased or decreased in response to fluctuations in the power generation load request.

That is, in this cooperative control method, the gasification in the gasification furnace of the gasification process unit 1 can be made to follow the fluctuation of the power generation load request quickly.
As prior art documents of this type of control, there are the following.
JP 2002-129910 A JP-A-7-234701 Japanese Patent No. 2685341 JP-A-11-210412

As described above, when the feedforward control is performed, the gasification in the gasification furnace of the gasification process unit 1 can improve the followability to the fluctuation of the power generation load request, but the gasification of the gasification process unit 1 There are dead time and control delays in the furnace. Therefore, for example, when the fluctuation of the power generation load request becomes larger than a certain level, the detection of the increase in fuel gas is delayed due to the existence of dead time, and the production amount of fuel gas thereafter increases or decreases extremely. The followability with respect to the fluctuation of the request becomes worse.
Specifically, when the demand for the power generation load is suddenly reduced, the fuel gas consumption is reduced, whereas the supply amount is not suddenly reduced, so the fuel gas becomes redundant. At that time, if the pressure of the surplus fuel gas exceeds a certain level, it is necessary to combust and release the fuel gas from the flare stack or to discharge it to a spare tank or the like to prevent an abnormal increase in pressure. When the fuel gas is burned and released from the flare stack, it has not only a simple economic loss but also a problem of generating a new environmental load. Further, when a spare tank is provided, an increase in equipment cost and space is required, resulting in an increase in cost.
On the other hand, when the demand for the power generation load suddenly increases and the supply of fuel gas is not in time and the pressure drops below a certain level, the output of the turbine does not increase but decreases. When the pressure drop exceeds a certain level, a stop signal is issued due to the turbine trip, which causes a power generation stoppage.
If the follow-up to fluctuations in the power generation load demand is poor as described above, it will greatly affect the operation reliability of the gasification combined power generation facility, especially if it cannot be operated continuously due to power generation stoppage, etc. You will suffer a loss.

  The present invention has been made in view of the above circumstances, and even when the fluctuation in power generation load demand is large, the production amount of fuel gas in the gasification facility can be stabilized, and the followability to the fluctuation in power generation load demand is further improved. It aims at providing the gasification combined cycle power generation equipment which can be improved.

  A combined gasification power generation facility according to the present invention includes a gasification facility and a combined power generation facility using a gas produced by the gasification facility as a fuel, and a gas turbine and a steam using the fuel gas produced by the gasification facility. A gasification combined power generation facility that generates power in the combined power generation facility by rotating a turbine, wherein a required amount of fuel gas in the combined power generation facility is supplied to the gas in response to a power generation load request to the combined power generation facility. A control system for feed-forward control of the gasification equipment to be produced by the gasification equipment, and the control system generates power to the combined power generation equipment based on dead time and control delay existing in the gasification equipment. A dead time compensation circuit is provided for delaying the load request and causing the combined power generation facility to follow up with a certain delay.

Further, the present invention provides a difference between the fluctuation in the flow rate of the fuel gas and the fluctuation in the actual flow rate of the fuel gas required in the combined power generation facility in which the control system is further operated by the dead time compensation circuit. And a fuel gas flow rate variation compensation circuit for correcting a set value for feedforward control transmitted to the gasification facility.
Furthermore, the present invention provides the control system in which the gas is supplied so that the supply amount of oxygen necessary for the production of fuel gas in the gasification facility follows the increase or decrease in the production amount of fuel gas in the gasification facility. The feed-forward control is performed on a compressor that compresses and sends oxygen to the gasification equipment.

  Further, according to the present invention, the control system allows the oxygen to be supplied from the air so that the supply amount of oxygen necessary for the production of the fuel gas in the gasification facility can follow the increase or decrease in the production amount of the fuel gas in the gasification facility. The air separation device that separates the gas and supplies it to the gasification facility is feedforward controlled.

The control method of the present invention includes a gasification facility and a combined power generation facility that uses a gas produced by the gasification facility as a fuel, and rotates a gas turbine and a steam turbine using the fuel gas produced by the gasification facility. A method for controlling a gasification combined power generation facility that generates electric power in the combined power generation facility, wherein a required amount of fuel gas in the combined power generation facility is supplied to the gas in response to a power generation load request to the combined power generation facility. A step of outputting a feedforward signal for increasing or decreasing the production amount of the fuel gas to the equipment constituting the gasification facility, in order to manufacture the gasification facility;
Assuming dead time and control delay existing in the gasification facility, the generation load request to the combined power generation facility is delayed, and a pseudo signal is sent to the combined power generation facility so that the combined power generation facility is operated with a certain delay. It is characterized by performing control so that zero flare operation can be performed by executing the outputting step.
Further, based on the difference between the fluctuation of the flow rate of the fuel gas required in the combined power generation facility and the fluctuation of the actual flow rate of the fuel gas, a set value for feedforward control transmitted to the gasification facility It is characterized by comprising a step of correcting.

  According to the gasification combined power generation facility of the present invention, it is a waste that delays the power generation load request to the combined power generation facility based on the dead time and control delay existing in the gasification facility and causes the combined power generation facility to follow-up with a certain delay. Since the time compensation circuit is provided in the control system, even when the fluctuation of the power generation load request is large, the gasification facility is feedforward controlled according to the power generation load request, and for the gasification facility that is feedforward controlled, In consideration of the dead time and control delay, the combined power generation facility can be operated in a stable and stable manner with a certain delay, and the followability to fluctuations in the power generation load request can be further improved. In particular, when the power generation load fluctuation is 3% or less per minute, the gasification facility can be operated with zero flare without using facilities such as a tank as a buffer for absorbing excess gas.

  Further, according to the present invention, the gasification facility is based on the difference between the variation in the flow rate of the fuel gas required in the combined power generation facility that is operated following the dead time compensation circuit and the variation in the actual fuel gas flow rate. Because the fuel gas flow rate variation compensation circuit that corrects the set value for feedforward control of the engine is provided, the flow rate difference between the fuel gas from the gasification facility and the fuel gas required in the combined power generation facility is minimized Therefore, stable operation of the combined power generation facility can be achieved.

  Further, according to the present invention, the control system allows the gasification equipment to follow the supply amount of oxygen necessary for producing the fuel gas in the gasification equipment in accordance with the increase or decrease in the production amount of the fuel gas in the gasification equipment. Since the compressor that feeds compressed oxygen is fed forward, the amount of oxygen supplied to the gasification facility can be stably supplied according to the load of the gasification facility.

  Furthermore, according to the present invention, the control system separates oxygen from the air in accordance with an increase or decrease in the amount of fuel gas produced in the gasification facility, according to an increase or decrease in the amount of fuel gas produced in the gasification facility. Since the air separation device that separates oxygen from the air is feedforward controlled to follow, the supply amount of oxygen to the gasification facility can be more stably supplied according to the load of the gasification facility.

The best mode for carrying out the present invention will be described below with reference to the drawings.
First, a combined gasification power generation facility to which a cooperative control system as a reference to which an embodiment of the present invention is applied will be described.
FIG. 1 shows a more specific configuration of the combined gasification power generation facility to which the cooperative control method whose principle is shown in FIG. 3 is applied, and the configuration will be described as a comparative example with the present embodiment.
As shown in the figure, the combined gasification power generation facility 21 includes an air separation device 22, a gasification furnace 23, a gas processing facility 24, and a combined power generation facility 25.
The air separation device 22 separates the fed air into oxygen and nitrogen. The oxygen separated by the air separation device 22 is pressurized by the oxygen compressor 26 and sent to the gasification furnace 23, and nitrogen is pressurized by the nitrogen compressor 27 and sent to the combined power generation facility 25.

  The gasification furnace 23 is supplied with fuel raw materials such as residual oil and coal and steam from the combined power generation facility 25. The gasifier 23 produces a crude fuel gas mainly composed of hydrogen and carbon monoxide from oxygen, a fuel raw material, and steam. The crude fuel gas is sent to the gas processing facility 24, and the fuel gas refined by dedusting, desulfurization, etc. is sent to the gas processing facility 24, and this fuel gas is sent to the combined power generation facility 25.

  The combined power generation facility 25 includes a gas turbine, a steam turbine, and a generator. The gas turbine is supplied with fuel gas from the gas processing facility 24 mixed with nitrogen from the nitrogen compressor 27 and adjusted to a predetermined concentration. And this gas turbine burns the fuel gas supplied and rotates a turbine. Exhaust gas from the gas turbine is sent to a boiler, where steam is generated by exhaust heat and fuel combustion heat, and the steam is sent to a steam turbine. Thereby, a steam turbine converts the supplied steam into kinetic energy called rotation of the turbine. Then, the generator is driven by these gas turbine and steam turbine to generate electricity. The combined power generation facility 25 can be supplied with auxiliary fuel such as kerosene from a supply line (not shown), and the gas turbine can be operated with fuel gas or with auxiliary fuel.

A flare stack 28 is connected to a fuel gas line that supplies fuel gas to the combined power generation facility 25. The flare stack 28 flares the fuel gas for the purpose of releasing the gas and suppressing the pressure rise when the gas pressure in the fuel gas line exceeds a specified pressure due to some cause.
The gasification combined power generation facility 21 is provided with control valves 31, 32, and 33 on the fuel raw material supply line, the oxygen supply line, and the steam supply line to the gasification furnace 23, respectively. The supply amount of the fuel raw material, oxygen, and steam to 23 can be adjusted. In addition, although the case where a control valve is used as the flow control means will be described, instead of this control valve, for example, the flow rate is controlled by controlling the rotation speed of a drive motor of a device such as a fuel supply pump or a blower. Including cases.

Control valves 34 and 36 are also provided in the fuel gas supply line and the nitrogen supply line to the combined power generation facility 25, respectively, so that the amount of fuel gas and nitrogen supplied to the combined power generation facility 23 can be adjusted. Yes.
Further, a control valve 37 is also provided in the fuel gas branch line connected to the flare stack 28 so that the flow rate of the fuel gas to the flare stack 28 can be adjusted.

Next, the control system of the gasification combined power generation facility 21 will be described.
The combined gasification power generation facility 21 includes an air separation device load controller 41, a gasification furnace load controller 42, and a power generation load controller 43.
The air separation device load controller 41 controls the air separation device 22 by outputting a control signal.
The gasifier load controller 42 outputs a control signal to the control valves 31, 32, 33 provided in the fuel raw material supply line, the oxygen supply line, and the steam supply line, and the control valves 31, 32, 33 are Control. The gasifier load controller 42 also transmits a control signal to be transmitted to the control valve 32 of the oxygen supply line to the air separation device load controller 41.

A set value is transmitted from the power generation load setting device 44 to the power generation load controller 43. Further, the power generation load controller 43 is transmitted with power generation output detection data from a power generation output detector 45 that detects a power generation output in the combined power generation facility 25. The power generation load controller 43 outputs control signals to the control valve 34 of the fuel gas supply line and the control valve 36 of the nitrogen supply line, and controls these control valves 34 and 36. That is, the power generation load controller 43 controls the combined power generation facility 25 using the power generation output as a controlled variable.
The power generation load controller 43 also outputs control signals to the gasifier load controller 42 and the nitrogen compressor controller 52 via the adders 61 and 62.

  The oxygen compressor 26 is provided with an oxygen compressor controller 51, and a set value is transmitted to the oxygen compressor controller 51 from an oxygen compressor controller setter 53. Further, detection data is transmitted to the oxygen compressor controller 52 from a detector 55 that detects the pressure or flow rate in the oxygen supply line to the gasifier 23. Then, the oxygen compressor controller 51 outputs a feedback control signal to the oxygen compressor 26 based on the set value from the oxygen compressor controller setter 53 and the detection data from the detector 55, and the oxygen compressor 26 is turned on. Control. Thereby, the oxygen compressor 26 is controlled using the downstream pressure or flow rate as a controlled variable.

  The nitrogen compressor 27 is provided with a nitrogen compressor controller 52, and a set value is transmitted from the nitrogen compressor controller setting unit 54 to the nitrogen compressor controller 52. Detection data is transmitted to the nitrogen compressor controller 52 from the detector 56 that detects the pressure or flow rate in the supply line of nitrogen to the combined power generation facility 25 via the adder 62. The nitrogen compressor controller 52 is based on the set value from the nitrogen compressor controller setter 54 and the addition value of the detection data from the detector 56 and the control signal from the power generation load controller 43. A control signal is output to control the nitrogen compressor 27. Thereby, the nitrogen compressor 27 is controlled by using the downstream pressure or flow rate as a controlled variable. The control of the oxygen compressor 26 and the nitrogen compressor 27 is switched to either pressure control or flow rate control according to the load condition.

The fuel gas line for supplying the fuel gas to the combined power generation facility 25 is provided with a gas pressure detector 57 for detecting the pressure of the fuel gas, and the detection data from the gas pressure detector 57 is used for the gasifier. It is transmitted to the gas pressure controller 58 and the flare gas pressure controller 59, respectively.
The gasifier gas pressure controller 58 outputs a control signal to the adder 61. Thereby, the control signals from the gasifier gas pressure controller 58 and the power generation load controller 43 are added to the gasifier load controller 42 by the adder 61 and transmitted. That is, the gasification furnace 23 is controlled using the gas pressure of the fuel gas on the downstream side of the gas processing facility 24 as a controlled variable.
The flare gas pressure controller 59 outputs a control signal to the control valve 37 on the branch line to the flare stack 28 to control the control valve 37. Here, the pressure setting value of the flare gas pressure controller 59 is slightly higher than that of the gasifier gas pressure controller 58. As a result, the branch line control valve 37 is closed during normal operation. However, if the detected value of the gas pressure detector 57 exceeds the set value of the flare gas pressure controller 59, the branch line control valve 37 is closed. Are opened and flare in the flare stack 28.

  In the combined gasification power generation facility 21, the control signal from the power generation load controller 43 based on the set value from the power generation load setting device 44 is supplied as a feedforward control signal via the adder 61 to the gasification furnace load controller 42. Sent to. Thereby, the gasifier load controller 42 controls the control valves 31, 32, and 33 of the supply line of the fuel raw material, oxygen, and steam to the gasifier 23 based on the signal to which the feedforward control signal is added. At the same time, a control signal is transmitted to the air separation device load controller 41 to control the air separation device 22. Thereby, the production amount of the fuel gas by the gasification furnace 23 and the gas processing facility 24 can be made to follow rapidly with respect to the fluctuation | variation of the fixed range of electric power generation load request | requirement.

That is, in the combined gasification power generation facility 21 to which the cooperative control in this comparative example is applied, the production amount of the fuel gas in the gasification facility composed of the gasification furnace 23 and the gas processing facility 24 can be quickly adjusted with respect to fluctuations in the power generation load request. Can be followed.
In this combined gasification power generation facility 21, the control signal from the power generation load controller 43 based on the set value from the power generation load setting device 44 is sent to the nitrogen compressor controller 52 via the adder 62 as a feedforward control signal. Is also sent. Thereby, the supply amount of nitrogen to the combined power generation facility 25 by the nitrogen compressor 27 is quickly followed and increased or decreased in response to fluctuations in the power generation load request.

Here, the combined gasification power generation facility 21 of the comparative example performs feedforward control for increasing or decreasing the amount of fuel gas produced by the gasification furnace 23 and the gas processing facility 24 in response to fluctuations in the power generation load request. In the fuel gas production facility using the gasification furnace 23 and the gas processing facility 24, there is a dead time and a control delay while fuel is supplied from the gasification facility to the power generation facility.
Here, the dead time is a time when no result appears after an instruction (signal) is input to the process or system, and more precisely, as shown in FIG.
That is, as shown in (a), even when the control output (operation variable) rises and is output instantaneously, the behavior of the controlled variable generally has a delay characteristic as shown in (b). Furthermore, if there is a dead time, the actual behavior of the controlled variable will cause many delays as shown in (c). In the present invention, compensation is performed when both dead time and control delay exist as shown in FIG.
And if the fluctuation of the power generation load demand is large, the detection of the increase or decrease of the fuel gas is delayed due to the existence of the dead time, and the production amount of the fuel gas thereafter increases or decreases extremely. Sexuality gets worse.

  For this reason, in this embodiment, as shown in FIG. 2, in addition to the cooperative control method of FIG. 1, the generation load request to the combined power generation facility is delayed assuming the above-described dead time and control delay. In addition, a dead time compensation circuit is provided for causing the combined power generation facility to follow up with a certain delay. That is, a gasification plant dead time compensation circuit 46 is provided between the power generation load controller 43 and the power generation load setting device 44. This gasification plant dead time compensation circuit 46 includes dynamic effects including an influence on the pressure of the fuel gas with respect to a change in the set value from the power generation load setting device 44 and an influence on the pressure of the fuel gas with respect to a change in the output of the gas pressure controller 58. In this example, the dead time in the gasification facility including the gasification furnace 23 and the gas processing facility 24 is compensated for the set value from the power generation load setting device 44. The gasification plant dead time compensation circuit 46 intentionally delays the operation of the combined power generation facility 25, and always has a certain delay with respect to the set value of the power generation load from the power generation load setting device 44. Follows stably.

  As described above, according to the gasification combined power generation facility 21, the gasification facility including the gasification furnace 23 and the gas processing facility 24 is fed forward according to the power generation load request even when the variation in the power generation load request is large. The combined power generation facility 25 can be operated in a stable and stable manner with a certain delay in consideration of the dead time and control delay of the gasification facility that is controlled and feedforward controlled. It is possible to further improve the follow-up performance with respect to the fluctuations.

Further, the gasification combined power generation facility 21 has an intentional delay in the set value of the power generation load by the gasification plant dead time compensation circuit 46 and a change in the flow rate of the fuel gas required in the combined power generation facility 25 and the actual value. In order to compensate for the difference from the fluctuation of the fuel gas flow rate, a fuel gas flow rate variation compensation circuit 47 is provided. The fuel gas flow rate change amount compensation circuit 47 adds a correction value to the set value of the power generation load transmitted from the power generation load setting device 44 to the gasifier load controller 42 by the adder 63, and this feedforward control. The set value of the power generation load transmitted as a signal is corrected.
Thus, based on the difference between the fluctuation in the flow rate of the fuel gas required in the combined power generation facility 25 that is operated by the gasification plant dead time compensation circuit 46 and the fluctuation in the actual fuel gas flow rate, the gasification is performed. Since the fuel gas flow rate change compensation circuit 47 for correcting the set value for feedforward control transmitted to the furnace load controller 42 is provided, the fuel from the gasification facility including the gasification furnace 23 and the gas processing facility 24 is provided. The flow rate difference between the gas and the fuel gas required in the combined power generation facility 25 can be suppressed as much as possible, and the combined power generation facility 25 can be stably operated.

In addition, when the amount of fuel gas produced by the gasification furnace 23 and the gas processing facility 24 is increased or decreased by the feedforward control in response to fluctuations in the power generation load request, the supply amount of oxygen necessary for the fuel gas is also increased or decreased. Need arises.
For this reason, in the present embodiment, an adder 72 that adds the control signal from the gasifier load controller 42 to the control signal from the oxygen compressor controller 51 and transmits it to the oxygen compressor 26 is provided. Thereby, the control signal from the gasifier load controller 42 transmitted based on the feedforward control signal from the power generation load controller 43 is added to the control signal from the oxygen compressor controller 51 as a feedforward signal, and the control signal The oxygen compressor 26 is controlled.

That is, the oxygen compressor 26 is quickly controlled with respect to the increase or decrease in the amount of fuel gas produced in the gasification furnace 23, and in particular, the oxygen supply amount that greatly affects the temperature change in the gasification furnace 23 is gasified. According to the load of the gasification equipment which consists of the furnace 23 and the gas processing equipment 24, it can supply stably.
Further, the oxygen supply amount necessary for the production of the fuel gas in the gasification facility comprising the gasification furnace 23 and the gas processing facility 24 is separated from the air in accordance with the increase or decrease of the fuel gas production amount in the gasification facility. Since the air separation device 22 is feedforward controlled so as to follow, the supply amount of oxygen can be supplied more stably according to the load of the gasification facility including the gasification furnace 23 and the gas treatment facility 24. .

It is a circuit diagram explaining the comparative example of the gasification combined cycle power generation facility to which the cooperative control system was applied. It is a circuit diagram explaining the gasification combined cycle power generation equipment concerning an embodiment. It is a circuit diagram explaining the conventional gasification combined cycle power generation equipment. It is a figure which shows the relationship between an operation variable and a controlled variable, and dead time.

Explanation of symbols

21 Combined gasification power generation facility 22 Air separation device 23 Gasification furnace (gasification facility)
24 Gas processing equipment (gasification equipment)
25 Combined power generation facilities 26 Oxygen compressor (compressor)
42 Gasifier load controller (control system)
43 Power generation load controller (control system)
46 Gasification plant dead time compensation circuit (dead time compensation circuit)
47 Fuel gas flow rate change compensation circuit

Claims (6)

A combined power generation facility that uses a gasification facility and a gas produced by the gasification facility as a fuel, and rotates the gas turbine and the steam turbine using the fuel gas produced by the gasification facility; A gasification combined power generation facility that generates power at
In response to a power generation load request to the combined power generation facility, a control system for feedforward control of the gasification facility is provided to produce fuel gas required in the combined power generation facility in the gasification facility,
The control system assumes a dead time existing in the gasification facility and a delay in control, delays a power generation load request to the combined power generation facility, and compensates for a dead time in which the combined power generation facility is operated with a certain delay. A gasification combined power generation facility characterized by comprising a circuit.   The control system further includes the gas based on a difference between a change in the flow rate of the fuel gas required in the combined power generation facility that is operated by the dead time compensation circuit and a change in the actual flow rate of the fuel gas. 2. The combined gasification power generation facility according to claim 1, further comprising a fuel gas flow rate change amount compensation circuit that corrects a set value for feedforward control transmitted to the conversion facility.   The control system compresses oxygen to the gasification facility so that the supply amount of oxygen necessary for the production of fuel gas in the gasification facility can follow the increase or decrease in the production amount of fuel gas in the gasification facility. The gasification combined power generation facility according to claim 1 or 2, wherein the compressor to be fed is feedforward controlled.   The control system separates oxygen from air and causes the gas to be supplied in accordance with an increase or decrease in the amount of fuel gas produced in the gasification facility in order to follow the supply amount of oxygen necessary for production of fuel gas in the gasification facility. 4. The combined gasification power generation facility according to claim 3, wherein the air separation device supplied to the gasification facility is feedforward controlled. A combined power generation facility that uses a gasification facility and a gas produced by the gasification facility as a fuel, and rotates the gas turbine and the steam turbine using the fuel gas produced by the gasification facility; A method for controlling a combined gasification power generation facility that generates power at
In response to the power generation load requirement for the combined power generation facility, the amount of fuel gas produced is supplied to the equipment constituting the gasification facility in order to cause the gasification facility to produce the required amount of fuel gas in the combined power generation facility. Outputting a feedforward signal to be increased or decreased;
Assuming dead time and control delay existing in the gasification facility, the generation load request to the combined power generation facility is delayed, and a pseudo signal is sent to the combined power generation facility so that the combined power generation facility is operated with a certain delay. A process of outputting;
The control method of the gasification combined cycle power generation equipment characterized by performing control so that zero flare operation can be performed by performing.   Further, based on the difference between the fluctuation in the flow rate of the fuel gas required in the combined power generation facility and the fluctuation in the actual flow rate of the fuel gas, a set value for feedforward control transmitted to the gasification facility is set. The control method of the gasification combined cycle power plant according to claim 5 provided with the process of amending.

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