Thermal power generation system, information processing device, program, and control method for thermal power generation system

Abstract

To provide a thermal power generation system that includes a gas turbine power generator using coal gas as fuel and functions as an adjustment power supply.SOLUTION: A thermal power generation system 100 sequentially introduces coal gas which has been gasified in a coal gasification furnace 2 into a carbon monoxide shift reactor 3 and a carbon dioxide absorber 4, and then into a gas turbine power generator 6 and generates power therein. The thermal power generation system includes: a bypass pipe 13 which does not go through the monoxide carbon shift reactor 3 from the coal gasification furnace 2, a coal gas holder 5 which is connected to a branch pipe 15 arranged at an outlet of the dioxide carbon absorber 4 and can store a part of the coal gas; and an information processing device 1. When an amount of power generation required from the gas turbine power generator 6 increases, the information processing device 1 raises operation of the coal gasification furnace 2. When an increase rate of a flow rate of the coal gas from the coal gasification furnace 2 is equal to or higher than a prescribed rate, the information processing device opens a bypass piping flow rate control valve 14 and makes the coal gas stored in the coal gas holder 5 flow to the gas turbine power generator 6.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a thermal power generation system, an information processing apparatus, a program, and a control method for a thermal power generation system.

Background Art

[0002] Conventionally, a demonstration test of a thermal power generation system has been conducted in which coal gasified in a coal gasifier is introduced into a carbon monoxide shift reactor, then into a carbon dioxide absorption apparatus, and then into a gas turbine generator for power generation. Patent Document 1 describes this type of technology.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The load change rate of the coal gasifier is as high as ~16% / min and has a high load adjustment ability, and it is expected to be utilized as an adjustment power source. On the other hand, the load change rate of the carbon monoxide shift reactor has only been confirmed up to about 1% / min.

[0005] The load change rate of the carbon dioxide separation and recovery facility is restricted by the temperature change of the catalyst filled in the carbon monoxide shift reactor. When the amount of introduced gas from the coal gasifier increases or decreases, the linear velocity of the carbon monoxide shift reactor changes accordingly, and the temperature distribution generated by the reaction in the catalyst layer changes. The catalyst may deteriorate due to a rapid temperature change, and there are restrictions on the change rate of the introduced gas amount.

[0006] Therefore, in a thermal power generation system where all of the coal gasified gas produced from a coal gasifier is processed by a carbon monoxide shift reactor and a carbon dioxide absorption device, the load change rate of the gas turbine generator is limited to 1% / min, making it difficult to function as a regulating power source.

[0007] The present invention aims to provide a thermal power generation system that has a gas turbine power generation device that uses coal gas as fuel and functions as a regulating power source. [Means for solving the problem]

[0008] (1) The thermal power generation system is a thermal power generation system that generates electricity by introducing coal gasified coal in a coal gasifier into a carbon monoxide shift reactor, then into a carbon dioxide absorption device, and then into a gas turbine generator, and comprises a bypass pipe that introduces coal gas from the coal gasifier to the carbon dioxide absorption device without passing through the carbon monoxide shift reactor, a bypass pipe flow control valve that controls the flow rate of the bypass pipe, a branch pipe provided in the flow path connecting the carbon dioxide absorption device and the gas turbine generator, a coal gas holder connected to the branch pipe and capable of storing a portion of the coal gas, and a branch pipe provided in the branch pipe The system includes a branch pipe flow control valve that controls the flow direction and flow rate of coal gas, and an information processing device, the information processing device having a coal gasifier control means, a bypass pipe flow control means, and a branch pipe flow control means. When the amount of power required by the gas turbine generator increases, the coal gasifier control means increases the operation of the coal gasifier, and when the rate of increase of the flow rate of coal gas from the coal gasifier exceeds a predetermined level, the bypass pipe flow control means opens the bypass pipe flow control valve, and the branch pipe flow control means controls the branch pipe control valve to flow the coal gas stored in the coal gas holder to the gas turbine generator.

[0009] According to the invention of (1), a thermal power generation system is provided which has a gas turbine power generation device that uses coal gas as fuel and functions as a regulating power source.

[0010] (2) In the thermal power generation system of (1), the bypass piping flow rate control means controls the rate of temperature rise of the carbon monoxide shift reactor to a predetermined value or less.

[0011] According to the invention of (2), the degradation of the catalyst used in the carbon monoxide shift reactor can be suppressed.

[0012] (3) In the thermal power generation system of (1) or (2), when the amount of power generated by the gas turbine generator is constant, the coal gasifier control means keeps the operation of the coal gasifier constant, the bypass piping flow control means closes the bypass piping flow control valve, and the branch piping flow control means controls the branch piping control valve to store a portion of the coal gas in the coal gas holder.

[0013] According to invention (3), coal gas with a high hydrogen content is stored, and the coal gas with a high hydrogen content can be used to generate electricity using a gas turbine generator when needed.

[0014] (4) In the thermal power generation system of (1) or (2), when the amount of power generated by the gas turbine generator is reduced, the coal gasifier control means reduces the operation of the coal gasifier, the bypass piping flow control means controls the bypass piping flow control valve to reduce the flow rate of coal gas in the bypass piping, and the branch piping flow control means controls the branch piping control valve to reduce the amount of coal gas flowing from the coal gas holder to the gas turbine generator, or to store a portion of the coal gas discharged from the carbon dioxide absorption device in the coal gas holder.

[0015] According to the invention of (4), a thermal power generation system is provided that can reduce carbon dioxide emissions even when the power generation of a gas turbine generator is reduced.

[0016] (5) The information processing device introduces coal gas produced by gasifying coal in a coal gasifier into a carbon monoxide shift reactor, then into a carbon dioxide absorption device, then into a gas turbine generator to generate electricity, a bypass pipe that introduces coal gas from the coal gasifier to the carbon dioxide absorption device without passing through the carbon monoxide shift reactor, a bypass pipe flow control valve that controls the flow rate of the bypass pipe, a branch pipe provided in the flow path connecting the carbon dioxide absorption device and the gas turbine generator, a coal gas holder connected to the branch pipe and capable of storing a portion of the coal gas, and a branch pipe control valve provided in the branch pipe that controls the flow direction and flow rate of the coal gas in the branch pipe. An information processing device for controlling a thermal power generation system having a coal gasifier control means, a bypass pipe flow rate control means, and a branch pipe flow rate control means, wherein when the amount of power generation required by the gas turbine increases, the coal gasifier control means increases the operation of the coal gasifier, If the rate of increase of the coal gas flow rate from the coal gasifier exceeds a predetermined level, the bypass piping flow control means opens the bypass piping flow control valve, and the branch piping flow control means controls the branch piping control valve to flow the coal gas stored in the coal gas holder to the gas turbine generator.

[0017] According to the invention of (5), an information processing device is provided that realizes a thermal power generation system having a gas turbine power generation device that uses coal gas as fuel and functions as a regulating power source.

[0018] (6) The computer program introduces coal gas produced by gasifying coal in a coal gasifier into a carbon monoxide shift reactor, then into a carbon dioxide absorber, then into a gas turbine generator to generate electricity, a bypass pipe that introduces coal gas from the coal gasifier to the carbon dioxide absorber without passing through the carbon monoxide shift reactor, a bypass pipe flow control valve that controls the flow rate of the bypass pipe, a branch pipe provided in the flow path connecting the carbon dioxide absorber and the gas turbine generator, a coal gas holder connected to the branch pipe and capable of storing a portion of the coal gas, and a device provided in the branch pipe that controls the flow direction of the coal gas in the branch pipe. A program that causes a computer to perform steps to control a thermal power generation system having a branch pipe control valve that controls the flow rate, the program having a coal gasifier control function, a bypass pipe flow rate control function, and a branch pipe flow control function, wherein when the amount of power generation required by the gas turbine increases, the coal gasifier control function increases the operation of the coal gasifier, and when the rate of increase of the flow rate of coal gas from the coal gasifier exceeds a predetermined level, the bypass pipe flow rate control function opens the bypass pipe flow rate control valve, and the branch pipe flow control function controls the branch pipe control valve to flow the coal gas stored in the coal gas holder to the gas turbine generator.

[0019] According to the invention of (6), a program is provided that causes a computer to perform the step of controlling a thermal power generation system having a gas turbine power generation device that uses coal gas as fuel and functions as a regulating power source.

[0020] (7) The control method of the thermal power generation system introduces the coal gasified from coal in the coal gasifier into the carbon monoxide shift reactor, then into the carbon dioxide absorber, and then into the gas turbine generator for power generation. It includes a bypass pipe that introduces coal gas from the coal gasifier directly into the carbon dioxide absorber without passing through the carbon monoxide shift reactor, a bypass pipe flow control valve for controlling the flow rate of the bypass pipe, a branch pipe provided in the flow path connecting the carbon dioxide absorber and the gas turbine generator, a coal gas holder connected to the branch pipe that can store a part of the coal gas, and a branch pipe control valve provided in the branch pipe for controlling the flow direction and flow rate of the coal gas in the branch pipe. The method for controlling the thermal power generation system having these components includes a coal gasifier control step, a bypass pipe flow control step, and a branch pipe flow control step. When the required power generation amount of the gas turbine increases, the coal gasifier control step raises the operation of the coal gasifier. When the increase rate of the flow rate of the coal gas from the coal gasifier is above a predetermined value, the bypass pipe flow control step opens the bypass pipe flow control valve, and the branch pipe flow control step controls the branch pipe control valve to let the coal gas stored in the coal gas holder flow through to the gas turbine generator.

[0021] According to the invention of (7), a method for controlling a thermal power generation system having a gas turbine power generation device using coal gas as fuel and functioning as a regulating power source is provided.

Effect of the Invention

[0022] According to the present invention, a thermal power generation system having a gas turbine power generation device using coal gas as fuel and functioning as a regulating power source is provided.

Brief Description of the Drawings

[0023] [Figure 1] It is a diagram showing an overview of a gas turbine generator according to an embodiment of the present invention. [Figure 2] It is a block diagram showing the hardware configuration of an information processing device according to an embodiment of the present invention. [Figure 3]It is a block diagram showing the functional configuration of an information processing apparatus according to an embodiment of the present invention. [Figure 4] It is a diagram showing an overview of a thermal power generation system in which the power generation amount of a gas turbine generator according to an embodiment of the present invention is in an increasing state. [Figure 5] It is a flowchart of a process according to an embodiment of the present invention.

Mode for Carrying Out the Invention

[0024] Hereinafter, a thermal power generation system 100, an information processing apparatus 1, a program, and a control method of the thermal power generation system 100 according to an embodiment of the present invention will be described with reference to the drawings. In each figure, the same reference numerals are assigned to the same components.

[0025] FIG. 1 is a diagram showing an overview of a thermal power generation system 100 according to an embodiment of the present invention. The thermal power generation system 100 includes an information processing apparatus 1, a coal gasification furnace 2, a carbon monoxide shift reaction apparatus 3, a carbon dioxide absorption apparatus 4, a gas turbine generator 6, a heat recovery generator 7, and a coal gas holder 5. A bypass pipe 13 is provided in a flow path passing through a first pipe 8, a carbon monoxide shift reaction apparatus 3, and a second pipe 9 from the coal gasification furnace 2, and a bypass pipe flow control valve 14 is provided in the bypass pipe 13. The information processing apparatus 1 is set to be communicable with the coal gasification furnace 2, the bypass pipe flow control valve 14, etc., although details will be described later, and controls the coal gasification furnace 2, the bypass pipe flow control valve 14, etc.

[0026] A third pipe 10 is connected to the outlet of the carbon dioxide absorption device 4 and is connected to the gas turbine generator 6. A branch pipe 15 is provided on the third pipe 10, and the branch pipe 15 is connected to the coal gas holder 5. A branch pipe flow control valve 16 is provided on the branch pipe 15. The branch pipe flow control valve 16 has, for example, an openable / closable control valve and a compressor in parallel. The openable / closable control valve controls the flow of coal gas from the coal gas holder 5, and the compressor controls the flow of coal gas to the coal gas holder 5. The exhaust gas from the gas turbine generator 6 is sent to the heat recovery generator 7 through the fourth pipe 11. The steam discharged from the heat recovery generator 7 is sent to the carbon monoxide shift reactor 3 through the steam pipe 12.

[0027] In the coal gasifier 2, coal is gasified into coal gas. The coal gas is sent to the carbon monoxide shift reactor 3 through the first pipe 8. Steam generated by the heat recovery generator 7 (described later) is introduced into the carbon monoxide shift reactor 3 through the steam pipe 12. The carbon monoxide generated in the coal gasifier 2 reacts with the steam in the carbon monoxide shift reactor 3 to produce carbon dioxide and hydrogen. This reaction is shown in equation (1). CO+H2O → CO2+H2 (Formula 1) This reaction is accelerated by a catalyst.

[0028] Next, the coal gas is sent to the carbon dioxide absorption device 4 through the second pipe 9. In the carbon dioxide absorption device 4, for example, a chemical absorption method using an alkaline solution such as an amine, or a physical absorption method using ether, is used. Then, from the perspective of combating global warming, the carbon dioxide is recovered and used for other effective purposes.

[0029] The coal gas from which carbon dioxide has been absorbed is sent to the gas turbine generator 6 through the third pipe 10. The gas turbine generator 6 is an internal combustion engine that burns coal gas internally to obtain rotational motion. The exhaust gas from the gas turbine generator 6 is at a high temperature and converts water into steam. In the heat recovery generator 7, the pressure of this steam rotates the turbine to generate electricity. This steam is sent to the carbon monoxide shift reactor 3 through the steam pipe 12 and becomes the source of water in the reaction of equation (1) above.

[0030] As described above, the thermal power generation system 100 according to this embodiment is a combined power generation system having a gas turbine generator 6 and a heat recovery generator 7.

[0031] The information processing device 1 controls the thermal power generation system 100 according to this embodiment. Figure 2 shows the hardware configuration of the information processing device 1. As shown in Figure 2, the information processing device 1 comprises a control unit 20, an input / output unit 26, a communication means 27, and a storage unit 28. The control unit 20 has a processor 21, a ROM (Read Only Memory) 22, a RAM (Random Access Memory) 23, a bus 24, and an input / output interface 25. The information processing device 1 may be a general-purpose personal computer capable of performing various functions by installing various programs, or it may be a computer embedded in dedicated hardware.

[0032] The processor 21 performs various calculations and processes. The processor 21 is, for example, a CPU (central processing unit), MPU (micro processing unit), SoC (system on a chip), DSP (digital signal processor), GPU (graphics processing unit), ASIC (application specific integrated circuit), PLD (programmable logic device), or FPGA (field-programmable gate array). Alternatively, the processor 21 is a combination of several of these. Furthermore, the processor 21 may be a combination of these with hardware accelerators, etc.

[0033] The processor 21, ROM 22, and RAM 23 are interconnected via a bus 24. The processor 21 performs various processes according to the program recorded in ROM 22 or the program loaded into RAM 23. Part or all of the program may be incorporated into the circuitry of the processor 21.

[0034] Bus 24 is also connected to input / output interface 25. An input / output unit 26, a communication means 27, and a storage unit 28 are connected to input / output interface 25.

[0035] The input / output unit 26 is electrically connected to the input / output interface 25 by wire or wireless connection. The input / output unit 26 consists of, for example, an input unit such as a keyboard and mouse, and an output unit such as a display for displaying images and a speaker for amplifying sound. The input / output unit 26 may also have an integrated configuration of display and input functions, such as a touch panel.

[0036] The communication means 27 is a device for the processor 21 to communicate with the coal gasifier 2, carbon monoxide shift reactor 3, bypass piping flow control valve 14, branch piping flow control valve 16 according to the present invention, and other devices via a network such as the Internet (not shown). The memory unit 28 is a storage device such as a hard disk drive (HDD) or solid-state drive (SSD) that stores a program to control the entire thermal power generation system 100, the temperature of the carbon monoxide shift reactor 3, the amount of power generated by the gas turbine generator 6, the degree to which the bypass piping flow control valve 14 is open, the state of the branch piping flow control valve 16, and so on.

[0037] The hardware configuration shown in Figure 2 is merely an example and is not limited to this configuration. In addition to being composed of various processing units such as single processors, multi-processors, and multi-core processors, a combination of these various processing units and processing circuits such as ASICs (Application Specific Integrated Circuits) and FPGAs (Field-Programmable Gate Arrays) may be adopted to realize a functional processor configuration. The information processing device 1 does not have a storage unit 28, but rather a configuration in which a storage unit 28 is provided separately may be adopted.

[0038] Figure 3 is a block diagram showing the functional configuration of the information processing device 1 according to this embodiment. Each function shown in Figure 3 is realized by the processor 21 and other components of the information processing device 1 shown in Figure 2.

[0039] The coal gasifier control means 201 controls the coal gasifier 2. The bypass pipe flow control means 202 controls the bypass pipe flow control valve 14 provided in the bypass pipe 13 to control the flow rate of coal gas flowing through the bypass pipe 13. The branch pipe flow control means 203 controls the branch pipe flow control valve 16 provided in the branch pipe 15 to control the flow of coal gas flowing through the branch pipe 15. The gas turbine generator control unit 204 controls the gas turbine generator 6. The heat recovery generator control unit 205 controls the heat recovery generator 7.

[0040] The following explanation will describe how each functional configuration of the information processing device 1 functions in response to requests for increases or decreases in load or power generation, with reference to Figures 1 to 4. Figure 1 shows an overview of the thermal power generation system 100 when there is no request for an increase in the power generation of the gas turbine generator 6. Figure 4 shows an overview of the thermal power generation system 100 when there is a request for an increase in the power generation of the gas turbine generator 6.

[0041] This section explains how the thermal power generation system 100 is controlled when there is no request for an increase in the power output of the gas turbine generator 6.

[0042] First, we will explain the case where the load or the amount of power generated by the thermal power generation system 100 is kept constant.

[0043] The management means 206 of the information processing device 1 receives instructions via the communication means 27 or input / output unit 26 to maintain a constant power output of the gas turbine generator 6. The coal gasifier control means 201 sends instructions via the communication means 27 to the coal gasifier 2 to maintain a constant operation of the coal gasifier 2. Similarly, the following commands from the control unit 20 are sent, for example, via the communication means 27. The bypass piping flow control means 202 closes the bypass piping flow control valve 14. As a result, the entire amount of coal gas discharged from the coal gasifier 2 is introduced into the carbon monoxide shift reactor 3. The coal gas is then sent to the carbon dioxide absorber 4 via the second piping 9, where carbon dioxide is removed. The coal gas discharged from the carbon dioxide absorber 4 is introduced into the gas turbine generator 6 via the third piping 10.

[0044] The third pipe 10 is connected to the branch pipe 15. The branch pipe flow control means 203 controls the branch pipe control valve to store a portion of the coal gas discharged from the carbon dioxide absorption device 4 in the coal gas holder 5. The entire amount of coal gas stored in this coal gas holder 5 passes through the carbon monoxide shift reactor 3. As it undergoes the reaction shown in Equation 1, it has a high hydrogen content.

[0045] Next, we will explain the case where the load or the amount of power generated by the thermal power generation system 100 is increased, mainly with reference to Figure 4.

[0046] The management means 206 of the information processing device 1 receives instructions to increase the power output of the gas turbine generator 6 through the communication means 27 or the input / output unit 26. The coal gasifier control means 201 sends instructions to the coal gasifier 2 through the communication means 27 to increase the operation of the coal gasifier 2. Similarly, the following commands from the control unit 20 are sent, for example, through the communication means 27.

[0047] When the flow rate of coal gas from the coal gasifier 2 increases, the reaction shown in equation (1) in the carbon monoxide shift reactor 3 also increases. This reaction is exothermic, causing the temperature inside the carbon monoxide shift reactor 3 to rise. Incidentally, a catalyst is used in the reaction of equation (1). This catalyst deteriorates when the rate of temperature rise exceeds a certain level. To prevent this catalyst deterioration, the bypass piping flow rate control means 202 opens the bypass piping flow rate control valve 14 when the rate of increase in the flow rate of coal gas from the coal gasifier 2 exceeds a predetermined level, that is, when the rate of temperature rise in the carbon monoxide shift reactor 3 may exceed a predetermined value. The predetermined value is, for example, a rise of 2 degrees Celsius per minute.

[0048] Even when the coal gasifier control unit 201 increases the operation of the coal gasifier 2 in response to an instruction from the control unit 206 to increase the power output of the gas turbine generator 6, a portion of the gas is sent to the bypass piping 13. This can suppress the increase in coal gas introduced into the carbon monoxide shift reactor 3. As a result, the deterioration of the catalyst in the carbon monoxide shift reactor 3 can be suppressed.

[0049] A portion of the coal gas discharged from the coal gasifier 2 is not introduced into the carbon monoxide shift reactor 3, but flows through the bypass piping 13. The coal gas is then sent to the carbon dioxide absorber 4 through the second piping 9, where carbon dioxide is removed. The coal gas discharged from the carbon dioxide absorber 4 is introduced to the gas turbine generator 6 via the third piping 10.

[0050] Coal gas that passes through the bypass piping 13 without going through the carbon monoxide shift reactor 3 does not undergo the reaction represented by equation (1) and contains a relatively high amount of carbon monoxide. This carbon monoxide is burned in the gas turbine generator 6 to produce carbon dioxide. As a result, the carbon dioxide content in the exhaust gas emitted from the gas turbine generator 6 can be high. In this embodiment, by utilizing coal gas with a relatively high hydrogen content stored in the coal gas holder 5, the increase in the carbon dioxide content in the exhaust gas emitted from the gas turbine generator 6 is suppressed.

[0051] A more detailed explanation is provided. The third pipe 10 is connected to the branch pipe 15. The branch pipe flow control means 203 controls the branch pipe flow control valve 16 to send the coal gas stored in the coal gas holder 5 toward the gas turbine generator 6. Considering the possibility that the pressure of the coal gas in the coal gas holder 5 is lower than the pressure of the coal gas in the third pipe 10, the branch pipe flow control valve 16 may also have a pump function. The coal gas stored in this coal gas holder 5 has a high hydrogen content. Therefore, the increase in the carbon dioxide content of the coal gas sent to the gas turbine generator 6 is kept low. Even under increased load, a significant drop from the carbon dioxide recovery rate of approximately 90% during normal operation can be suppressed.

[0052] The gas turbine generator control unit 204 controls the gas turbine generator 6 to increase the amount of power it generates. The heat recovery generator control unit 205 controls the heat recovery generator 7 to increase the amount of power it generates.

[0053] For example, let's consider the case where we want to increase the power output of the gas turbine generator 6 by 16% per minute. It is possible to increase the operation of the coal gasifier 2 by 16% per minute. However, in this case, the temperature rise of the carbon monoxide shift reactor 3 exceeds, for example, 5 degrees Celsius per minute, causing the catalyst to deteriorate. If dealing with this temperature rise becomes the rate-limiting factor, it will not be possible to increase the power output of the gas turbine generator 6. In this embodiment, by sending coal gas through the bypass pipe 13 to the gas turbine generator 6, the temperature rise of the carbon monoxide shift reactor 3 is suppressed. This makes it possible to increase the operation of the coal gasifier 2 by 16% per minute and increase the power output of the gas turbine generator 6 by 16% per minute.

[0054] However, if left as is, carbon monoxide will be burned in the gas turbine generator 6, increasing carbon dioxide emissions. In this embodiment, coal gas with a high hydrogen content stored in the coal gas holder 5 is also burned in the gas turbine generator 6. When this coal gas with a high hydrogen content is burned, only water is produced, and carbon dioxide emissions are suppressed. Therefore, in order to increase the power generation of the gas turbine generator 6 by 16% per minute, the proportion of coal gas contributing to the increase in power generation can be controlled, for example, by 1% from the coal gas passing through the carbon monoxide shift reactor 3, 7% from the coal gas passing through the bypass piping 13, and 8% from the coal gas with a high hydrogen content stored in the coal gas holder 5. In this example, the increase in power generation from the coal gas passing through the bypass piping 13 is limited to 7%, the flow rate of carbon monoxide to the gas turbine generator 6 is suppressed, and the amount of carbon dioxide generated is reduced. Furthermore, since coal gas with a high hydrogen content is used for combustion, carbon dioxide emissions are suppressed.

[0055] The thermal power generation system according to this embodiment is capable of increasing power generation while suppressing carbon dioxide emissions.

[0056] Next, the case where the load or the amount of power generated by the thermal power generation system 100 is reduced, that is, the deloading process, will be explained with reference to Figure 1.

[0057] The management means 206 of the information processing device 1 receives instructions to reduce the power generation amount of the gas turbine generator 6 through the communication means 27 or the input / output unit 26. The coal gasifier control means 201 reduces the operation of the coal gasifier 2. The bypass piping flow control means 202 controls the bypass piping flow control valve 14 to reduce the flow rate of coal gas in the bypass piping 13. At the same time, the branch piping flow control means 203 controls the branch piping flow control valve 16 to reduce the amount of coal gas flowing from the coal gas holder 5 to the gas turbine generator 6, or to store a portion of the coal gas discharged from the carbon dioxide absorption device 4 in the coal gas holder 5. When the bypass piping flow control means 202 closes the bypass piping flow control valve 14, that is, when the bypass piping flow control means 202 controls the bypass piping flow control valve 14 to eliminate the flow rate of coal gas in the bypass piping 13, a portion of the coal gas discharged from the carbon dioxide absorption device 4 is stored in the coal gas holder 5.

[0058] The thermal power generation system 100 can adapt to load changes while maintaining a carbon dioxide capture rate of approximately 90% during constant output operation.

[0059] Refer to the flowchart in Figure 5 to explain the control flow of the thermal power generation system 100.

[0060] When the control process for the thermal power generation system 100 starts (step START), The management means 206 of the information processing device 1 receives the power generation amount as a power generation amount reception process (step S101). If the power generation amount is to be increased compared to the current power generation amount, the coal gasifier control means 201 increases the operation of the coal gasifier 2 as a coal gasifier operation increase process (step S11). Next, as a bypass pipe opening process, the bypass pipe flow control means 202 opens the bypass pipe flow control valve 14 (step S12). At the same time, as a coal gas holder gas release process (step S13), the branch pipe flow control means 203 opens the gas release valve of the branch pipe control valve provided in the branch pipe 15 and introduces the coal gas stored in the coal gas holder 5 to the gas turbine generator 6.

[0061] When the amount of power generated is to be maintained compared to the current amount of power generated, or when the amount of power generated is at a constant level (Step S01: Maintenance), the coal gasifier control means 201 maintains the operation of the coal gasifier 2 as a coal gasifier operation maintenance process (Step S21). Next, as a bypass pipe closure process, the bypass pipe flow rate control means 202 closes the bypass pipe flow rate control valve 14 (Step S22). At the same time, as a coal gas holder gas storage process (Step S23), the branch pipe flow control means 203 opens the gas storage valve of the branch pipe control valve provided in the branch pipe 15 and stores the coal gas discharged from the carbon dioxide absorption device 4 in the coal gas holder 5.

[0062] When reducing the amount of power generated compared to the current amount of power generated (Step S01: Reduction), the coal gasifier control means 201 reduces the operation of the coal gasifier 2 as a coal gasifier operation reduction process (Step S31). Next, as a bypass pipe closure process, the bypass pipe flow rate control means 202 closes the bypass pipe flow rate control valve 14 (Step S32). At the same time, as a coal gas holder gas flow change process (Step S13), the branch pipe flow control means 203 closes the gas release valve of the branch pipe control valve provided in the branch pipe 15 if it is open, opens the gas storage valve of the branch pipe control valve provided in the branch pipe 15, and stores the coal gas discharged from the carbon dioxide absorption device 4 in the coal gas holder 5 (Step S33). If the process is to continue, return to Step S01 (Step S02: Yes). If the process is not to continue, terminate the process (Step END).

[0063] The above explanation mainly described the thermal power generation system 100. The information processing device 1 of the thermal power generation system 100 can be used independently. Furthermore, it is possible to use a control method for the thermal power generation system 100 that follows the same steps as those performed by a program that causes a computer to execute the functions of the information processing device 1.

[0064] This disclosure allows for various embodiments and modifications without departing from the broad spirit and scope of the present invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the present invention. That is, the scope of the present invention is indicated by the claims, not by the embodiments. Various modifications made within the scope of the claims and the equivalent significance of the disclosure are considered to be within the scope of the present invention. [Explanation of Symbols]

[0065] 1. Information Processing Device 2. Coal gasifier 3. Carbon monoxide shift reactor 4. Carbon dioxide absorption device 5. Coal gas holder 6. Gas turbine generator 7. Heat recovery generator 13 Bypass piping 14 Bypass piping flow control valve 15 Branch piping 16 Branch piping flow control valve 100 Thermal power generation systems 201 Coal gasifier control means 202 Bypass piping flow control means 203 Branch pipe flow control means 204 Gas Turbine Generator Control Unit 205 Heat Recovery Generator Control Unit

Claims

1. A thermal power generation system in which coal gasified in a coal gasifier is introduced into a carbon monoxide shift reactor, then into a carbon dioxide absorption unit, and then into a gas turbine generator to generate electricity. A bypass pipe for introducing coal gas from the coal gasifier to the carbon dioxide absorption device without passing through the carbon monoxide shift reactor, A bypass pipe flow control valve for controlling the flow rate of the bypass pipe, A branch pipe is provided in the flow path connecting the carbon dioxide absorption device and the gas turbine generator, A coal gas holder connected to the aforementioned branch pipe and capable of storing a portion of the coal gas, A branch pipe flow control valve is provided in the branch pipe and controls the flow direction and flow rate of the coal gas in the branch pipe, Information processing equipment and It has, The aforementioned information processing device is It has a coal gasifier control means, a bypass pipe flow control means, and a branch pipe flow control means, When the amount of power required for the gas turbine generator increases, the coal gasifier control means increases the operation of the coal gasifier. If the rate of increase in the flow rate of the coal gas from the coal gasifier exceeds a predetermined value, the bypass piping flow rate control means opens the bypass piping flow rate control valve. The branch pipe flow control means controls the branch pipe flow control valve to cause the coal gas stored in the coal gas holder to flow to the gas turbine generator. Thermal power generation system.

2. The bypass piping flow rate control means controls the temperature rise rate of the carbon monoxide shift reactor to a predetermined value or less. The thermal power generation system according to claim 1.

3. When the amount of power generated by the gas turbine generator is at a constant level, The coal gasifier control means maintains the operation of the coal gasifier at a constant level, the bypass piping flow control means closes the bypass piping flow control valve, and the branch piping flow control means controls the branch piping flow control valve to store a portion of the coal gas in the coal gas holder. A thermal power generation system according to claim 1 or claim 2.

4. In a situation where the amount of power generated by the gas turbine generator is reduced, The coal gasifier control means reduces the operation of the coal gasifier, the bypass piping flow control means controls the bypass piping flow control valve to reduce the flow rate of the coal gas in the bypass piping, and the branch piping flow control means controls the branch piping flow control valve to reduce the amount of coal gas flowing from the coal gas holder to the gas turbine generator, or to store a portion of the coal gas discharged from the carbon dioxide absorption device in the coal gas holder. A thermal power generation system according to claim 1 or claim 2.

5. The coal gas, produced by gasifying coal in a coal gasifier, is introduced into a carbon monoxide shift reactor, then into a carbon dioxide absorption unit, and finally into a gas turbine generator to generate electricity. A bypass pipe for introducing coal gas from the coal gasifier to the carbon dioxide absorption device without passing through the carbon monoxide shift reactor, A bypass pipe flow control valve for controlling the flow rate of the bypass pipe, A branch pipe is provided in the flow path connecting the carbon dioxide absorption device and the gas turbine generator, A coal gas holder connected to the aforementioned branch pipe and capable of storing a portion of the coal gas, A branch pipe control valve is provided in the branch pipe and controls the flow direction and flow rate of the coal gas in the branch pipe, An information processing device for controlling a thermal power generation system having, It has a coal gasifier control means, a bypass pipe flow control means, and a branch pipe flow control means, When the amount of power required for the gas turbine generator increases, the coal gasifier control means increases the operation of the coal gasifier. If the rate of increase in the flow rate of the coal gas from the coal gasifier exceeds a predetermined value, the bypass piping flow rate control means opens the bypass piping flow rate control valve. The branch pipe flow control means controls the branch pipe control valve to cause the coal gas stored in the coal gas holder to flow to the gas turbine generator. Information processing device.

6. The coal gas, produced by gasifying coal in a coal gasifier, is introduced into a carbon monoxide shift reactor, then into a carbon dioxide absorption unit, and finally into a gas turbine generator to generate electricity. A bypass pipe for introducing coal gas from the coal gasifier to the carbon dioxide absorption device without passing through the carbon monoxide shift reactor, A bypass pipe flow control valve for controlling the flow rate of the bypass pipe, A branch pipe is provided in the flow path connecting the carbon dioxide absorption device and the gas turbine generator, A coal gas holder connected to the aforementioned branch pipe and capable of storing a portion of the coal gas, A branch pipe control valve is provided in the branch pipe and controls the flow direction and flow rate of the coal gas in the branch pipe, A program that causes a computer to perform the steps of controlling a thermal power generation system having, It has a coal gasifier control function, a bypass pipe flow control function, and a branch pipe flow control function. When the amount of power required by the gas turbine generator increases, the coal gasifier control function increases the operation of the coal gasifier. If the rate of increase in the flow rate of the coal gas from the coal gasifier exceeds a predetermined value, the bypass piping flow rate control function opens the bypass piping flow rate control valve. The branch pipe flow control function controls the branch pipe control valve to flow the coal gas stored in the coal gas holder to the gas turbine generator. program.

7. The coal gas, produced by gasifying coal in a coal gasifier, is introduced into a carbon monoxide shift reactor, then into a carbon dioxide absorption unit, and finally into a gas turbine generator to generate electricity. A bypass pipe for introducing coal gas from the coal gasifier to the carbon dioxide absorption device without passing through the carbon monoxide shift reactor, A bypass pipe flow control valve for controlling the flow rate of the bypass pipe, A branch pipe is provided in the flow path connecting the carbon dioxide absorption device and the gas turbine generator, A coal gas holder connected to the aforementioned branch pipe and capable of storing a portion of the coal gas, A branch pipe control valve is provided in the branch pipe and controls the flow direction and flow rate of the coal gas in the branch pipe, A method for controlling a thermal power generation system having, It includes a coal gasifier control step, a bypass piping flow control step, and a branch piping flow control step. If the amount of power required by the gas turbine generator increases, the coal gasifier control step increases the operation of the coal gasifier. If the rate of increase in the flow rate of the coal gas from the coal gasifier exceeds a predetermined value, the bypass piping flow control step opens the bypass piping flow control valve. The branch pipe flow control step controls the branch pipe control valve to cause the coal gas stored in the coal gas holder to flow to the gas turbine generator. A control method for a thermal power generation system.

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