JP2000240469A - Gasification composite power generating plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly perform the outflow of water from a gas turbine system to a gasification system or the inflow of water or steam from the gasification system to the gas turbine system by combining the water supplied from the gas turbine system to the gasification system at the outlet of each gas turbine system, and supplying it to the gasification system. SOLUTION: In a plant having three gas turbine systems 8 (8a-8c) to one gasification system 1, the condensate within the condenser 24 of a steam turbine system 20 is supplied to the heat exchangers 16-18 of each gas turbine system 8, and the water supplied to the gasification system 1 is combined at the outlet of the gas turbine system 8 and supplied to the gas cooler 6 of the gasification system 1 through an outflow header 28. The hot water or steam after heat exchange leaving the gas cooler 6 of the gasification system 1 is supplied to each gas turbine system 8. According to this, water can be stably supplied to the gasification system 1 regardless of the number of gas turbine systems 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined gasification combined cycle power plant having a combination of a gas turbine and a steam turbine, wherein the number of gasification facilities, the number of gas turbine facilities, and the number of steam turbine facilities are different. .

[0002]

BACKGROUND ART With the background of effective use and diversification of energy resources, there is great expectation for thermal power generation using gasified carbonaceous fuels such as coal or residual oil as fuels, particularly from the viewpoint of stability of resource supply and economic efficiency. Has been sent. Above all, in recent years, gasification combined cycle power plants combined with combined cycle power plants have attracted attention in terms of their high power generation efficiency and environmental compatibility, and are under development for practical use in the near future.

[0003] The characteristics of the integrated gasification combined cycle power plant are its environmental compatibility, compatibility with a wide range of coal types, and economic efficiency. However, recent improvements in power generation efficiency due to the high temperature of gas turbines have made it more realistic. It is expected to be the most promising power generation form using carbonaceous fuel such as coal or residual oil in the future.

[0004] The combined gasification power generation facility is composed of a gasification facility and a combined power generation facility, and the combined power generation facility is composed of a gas turbine facility including an exhaust heat recovery boiler and a steam turbine. Such a combined gasification and power generation system is a large-scale and complicated system, but is required to have a high-speed and reliable load response as a middle thermal power operation.

[0005] There are various types of gasification combined cycle power plants currently operated or planned, depending on the type of gasification furnace used and the type of gas purification system comprising a dust removal device and a desulfurization device. Here, as an example, the supply of liquid gasified fuel such as coal slurry or residual oil,
FIG. 20 shows an example of the overall configuration of a gasification furnace that performs medium-calorie gasification using oxygen as a gasifying agent, in which one gasification facility and one combined power generation system are used.

[0006] The gasification furnace 2 in the gasification facility 1 is a facility for generating gasified gas. This gasified gas is called a crude gas with respect to the purified gas. Gasification fuel is supplied to the gasification furnace 2 through a gasification fuel control valve 3 (a variable speed fuel charge pump may be used, but the control valve is described below as a control valve for simplification of description). Oxygen gas as a gasifying agent is supplied through the gasifying agent flow control valve 4.

Then, a high-temperature crude gas (about 1000 ° C.) containing flammable gases CO and H 2 is generated by a water gasification reaction in the gasification furnace 2. The crude gas produced in the gasification furnace 2 enters a dust removal device 5 composed of a scrubber or the like, where fine particles such as ash contained in the gas are removed. It is cooled to an allowable temperature (atmospheric temperature) and sent to the desulfurization unit 7.
Since the gasified fuel contains at most about several percent of sulfur, the sulfur content in the crude gas is desulfurized by the desulfurizer 7.
The gasified gas after desulfurization is sent to the gas turbine equipment 8 as a clean and refined gas (purified gas).

In the gas turbine equipment 8, the gas is sent to a combustor 10 of a gas turbine via a fuel flow control valve 9. Here, the fuel is combusted by the air pressurized from the atmosphere by the compressor 11 of the gas turbine, and this combustion gas is sent to the gas turbine 12 to drive the gas turbine 12. Gas turbine 12
Drives the gas turbine generator 13 connected on the same axis to generate power and obtain a predetermined output.

Since the combustion gas after driving the gas turbine 12 has a high temperature (about 600 ° C.), the exhaust heat recovery boiler 14
It is sent out, heat is recovered here, and is discharged from the chimney 15 to the atmosphere as low-temperature exhaust gas (about 100 ° C.). In the exhaust heat recovery boiler 14, a water or steam heat exchanger called a superheater 16, an evaporator 17, and a economizer 18 are sequentially arranged in accordance with the flow of the exhaust gas, and heat of the exhaust gas energy of the gas turbine 12 is recovered. You.

The steam generated by the heat recovery in the evaporator 17 becomes superheated steam (in a state of dry steam) from the steam drum 19 through the superheater 16, and becomes steam turbine equipment 20.
Supplied to The feedwater control valve 26 controls the feedwater flow from the feedwater pump 25, and controls the feedwater flow to the steam drum 19 so that the level of the steam drum 19 is kept constant by the signal of the drum level detector 27.

In the steam turbine facility 20, the superheated steam enters the steam turbine 22 through the steam control valve 21, and drives the steam turbine 22. By driving the steam turbine 22, a steam turbine generator 23 connected on the same axis is driven to generate power and obtain a predetermined output. On the other hand, the low-pressure wet steam that has worked in the steam turbine 22 becomes water in the condenser 24, is raised to a predetermined pressure by the water supply pump 25, is sent to the above-described economizer 18, and passes through the water supply control valve 26. Then, a cycle in which the steam is supplied to the steam drum 19 and becomes steam again is repeated.

Further, as described above, the gasification facility 1 is provided with the gas cooler 6, and the supply water used for the gas cooler 6 is supplied (outflow) from the gas turbine facility 8. The heat exchange between the feed water and the gas is performed to cool the water. The heated feed water or generated steam is returned to the gas turbine facility 8 again.

FIG. 20 shows a system in which gas is supplied to the gas cooler 6 of the gasification equipment 1 from the discharge side of the water supply pump 25 of the gas turbine equipment 8 and is returned to the steam drum 19 from the gas cooler 6. Depending on the equipment configuration of the facility 8 (also related to the steam turbine facility 20) and the thermal efficiency of the entire plant, the outflow point and the inflow point of the feedwater on the gas turbine facility 8 (or the steam turbine facility 20 in some cases) may vary. is there. Further, the fluid (water supply or steam) supplied (flowed) from the gas cooler 6 to the gas turbine equipment 8 is determined by the heat balance of the entire plant.

In the integrated gasification combined cycle facility as described above,
The power is generated by the gas turbine generator 13 and the steam turbine generator 2
The output is adjusted by the fuel flow control valve 9 of the gas turbine and the steam control valve 21 of the steam turbine. Further, by adjusting the gas generation amount by adjusting the gasification fuel control valve 2 of the gasification facility 1, the gas pressure is increased, and
Next, the output of the gas turbine 12 can be adjusted even if the fuel flow rate to the gas turbine is increased.

FIG. 20 shows a gas turbine generator 13.
And the steam turbine generator 23 are installed separately, but the gas turbine compressor 11 and the gas turbine 12
And the steam turbine 22 are connected on the same axis, and the gas turbine generator 13 and the steam turbine generator 23 may be combined into one.

The integrated gasification combined cycle facility described above is a combined gasification combined cycle power generation facility in which each of the gasification facility 1, the gas turbine facility 8, and the steam turbine facility 20 is constituted by one unit. In order to meet the demands for increasing output and various load operation demands, it has become common to configure one plant with a plurality of gasification facilities 1, gas turbine facilities 4, and steam turbine facilities 16.

Gasification equipment 1 and gas turbine equipment 8 are 3
FIG. 21 shows an example of an integrated gasification combined cycle facility including one unit and one steam turbine facility 20. The suffix a of the gasification facility 1, the gas turbine facility 8, and the steam turbine facility 20,
“b” and “c” denote each facility, and have the same device configuration. Water is supplied from the condenser 24 of the steam turbine facility 20 to each of the gas turbine facilities 8a, 8b, 8c. Further, feed water is supplied from each of the gas turbine facilities 8a, 8b, 8c to each of the gasification facilities 1a, 1b, 1c. Of the gas turbine equipment 8a, 8b, 8c.

[0018]

Here, when increasing the output of one plant, one gasification facility 1 needs one
The use of one gas turbine facility 8 is not necessarily advantageous in terms of thermal efficiency and economy of the whole plant. This is because the gasification furnace 2 has a problem of a single unit capacity, and the desulfurization unit 7 can purify a relatively large amount of gas with one unit. For this reason, there is a case where the number of the gasification facilities 1, the number of the gas turbine facilities 8, and the number of the steam turbine facilities 20 are different in one or more (multi-series combined gasification combined cycle power generation facilities). In some cases, the outflow of water to the facility 1 and the inflow of water or steam from the gasification facility 1 to the gas turbine facility 8 cannot be performed properly.

For example, if the feedwater flowing from the gas turbine facility 8 to the gasification facility 1 is not supplied as planned, the desulfurization efficiency of the desulfurization unit 7 changes and the sulfur content in the purified gas increases. In some cases, sulfur oxides in the exhaust gas discharged from the chimney 15 may increase. In general, sulfur oxides released to the atmosphere are subject to regulation and are unfavorable with respect to the environment. Therefore, it is necessary to reduce the output of the gas turbine equipment 8 or stop the operation. Also,
In the worst case, the desulfurization device 7 is damaged.

On the other hand, if the feedwater or steam flowing from the gasification facility 1 to the gas turbine facility 8 does not flow as planned, the operating point of the exhaust heat recovery boiler 14 changes and the efficiency of the gas turbine facility 8 decreases. If the change is abrupt, the exhaust heat recovery boiler 14 trips and the gas turbine equipment 8 cannot be operated.

As described above, if the outflow of the feedwater from the gas turbine facility 8 to the gasification facility 1 or the inflow of the feedwater or the steam from the gasification facility 1 to the gas turbine facility 8 is not performed properly, various factors may occur in plant operation. Problems arise.

Further, in order to meet various load operation demands, operation is performed in which the outputs of the gas turbine equipments 8 are not made identical from the viewpoint of thermal efficiency and economy. For example, when the required load of the plant is low, 1 gas turbine equipment 8
“a” operates at an efficient rated point, and operates each gas such as operating the second gas turbine equipment 8b and the third gas turbine equipment 8c at a partial load or stopping the third gas turbine equipment 8c. The operation is performed in a state where imbalance occurs in the turbine equipment 8 in which the loads are not the same. In such a case, the above-mentioned exchange of water or steam cannot be performed properly, and various problems occur in plant operation as described above.

Further, the operation state of the gasification facility 1 may be different for each facility for the same reason, and the above-mentioned exchange of water supply or steam cannot be performed properly, which causes various problems in plant operation as described above. .

[0024] It is an object of the present invention to provide a multi-line gasification system capable of properly supplying water from a gas turbine facility to a gasification facility or supplying water or steam from the gasification facility to a gas turbine facility. It is to provide a combined power generation facility. Another object of the present invention is to provide a control device for keeping the inflow amount and the outflow amount of the water properly in all operation states.

[0025]

According to a first aspect of the present invention, there is provided a multi-line combined gasification combined cycle power plant comprising at least one gasification facility, at least two gas turbine facilities, and at least one steam turbine. In the multi-line combined gasification combined cycle power plant that is configured with equipment and supplies water from the gas turbine equipment to the gasification equipment, and supplies water or steam from the gasification equipment to the gas turbine equipment. Water to be supplied from the gas turbine facility to the gasification facility is combined at an outlet of each gas turbine facility and supplied to the gasification facility.

According to the multi-line combined gasification combined cycle power plant according to the first aspect of the present invention, water supplied from two or more gas turbine facilities to one or more gasification facilities is joined at an outlet of each gas turbine facility. Then, it is supplied to the gas cooler of the gasification facility. Thereby, the outflow of water from two or more gas turbine facilities to the gasification facility is properly performed.

The multi-series combined gasification combined cycle power plant according to the second aspect of the present invention comprises two or more gasification facilities, one or more gas turbine facilities, and one or more steam turbine facilities, Water is supplied from the gas turbine facility to the gasification facility, and in a multi-line combined gasification combined cycle facility configured to supply water or steam from the gasification facility to the gas turbine facility, Water or steam to be supplied to the gas turbine equipment is merged at an outlet of the gasification equipment and supplied to the gas turbine equipment.

According to the multi-line combined gasification combined cycle power plant according to the second aspect of the present invention, water or steam supplied from a gas cooler of two or more gasification facilities to one or more gas turbine facilities is supplied to the gasification facility. They merge at the outlet and are supplied to gas turbine equipment. Thereby, the inflow of water or steam from two or more gasification facilities to the gas turbine equipment is properly performed.

The multi-line combined gasification combined cycle facility according to the third aspect of the present invention includes two or more gasification facilities, two or more gas turbine facilities, and one or more steam turbine facilities. Supplying water to the gasification facility from the gas turbine facility, and a multi-series combined gasification combined cycle facility configured to supply water or steam from the gasification facility to the gas turbine facility; Water to be supplied to the gasification facility is merged at the outlet of the gas turbine facility and supplied to the gasification facility, and water or steam supplied from the gasification facility to the gas turbine facility is merged at the exit of the gasification facility. And supplying the gas to the gas turbine equipment.

According to the multi-line combined gasification combined cycle power plant according to the third aspect of the present invention, water supplied from two or more gas turbine facilities to two or more gasification facilities is joined at the outlet of each gas turbine facility. Water or steam supplied to the gasification facility and supplied from the two or more gasification facilities to the two or more gas turbine facilities is joined at the outlet of the gasification facility and supplied to the gas turbine facility. Thereby, the outflow of water from the gas turbine facility to the gasification facility or the inflow of water or steam from the gasification facility to the gas turbine facility is performed properly.

According to a fourth aspect of the present invention, there is provided a multi-line combined gasification combined cycle facility according to any one of the first to third aspects, wherein water is supplied from the gas turbine facility to the gasification facility. An outflow control valve is installed at an outlet of each gas turbine facility in the system, and an outflow control device that controls the outflow control valve at a flow rate according to an output of the gas turbine or an output command value is provided.

According to the multi-line combined gasification combined cycle facility according to the fourth aspect of the present invention, in addition to the function of any one of the first to third aspects of the present invention, the gas is supplied from the gas turbine facility to the gasification facility. By controlling the outflow control valve by the outflow control device, the flow of the water is controlled to a flow rate corresponding to the output of the gas turbine or the output command value.

According to a fifth aspect of the present invention, there is provided the multi-line combined gasification combined cycle facility according to the fourth aspect of the present invention, wherein the outflow control device includes at least one of atmospheric temperature, atmospheric humidity, and atmospheric pressure.
One or more of them are used to correct the flow rate according to the output of the gas turbine or the output command value.

According to the multi-line combined gasification combined cycle facility according to the fifth aspect of the present invention, in addition to the operation of the fourth aspect, the outflow control device can control at least one of atmospheric temperature, atmospheric humidity and atmospheric pressure. Used to correct the opening of the outflow control valve.

According to a sixth aspect of the present invention, there is provided the multi-line combined gasification combined cycle power generation system according to the fourth aspect of the present invention, wherein the outflow control device replaces the gas turbine output or the output command value with the exhaust gas flow rate of the gas turbine. , Using at least one of the exhaust gas temperature and the drum pressure of the exhaust heat recovery boiler,
The method is characterized in that the flow rate is calculated.

According to the multi-stream combined gasification combined cycle system according to the sixth aspect of the present invention, in addition to the function of the fourth aspect of the present invention, the outflow control device uses a gas turbine instead of the gas turbine output or output command value. The opening degree of the outflow control valve is corrected using at least one of the exhaust gas flow rate, the exhaust gas temperature, and the drum pressure of the exhaust heat recovery boiler.

According to a seventh aspect of the present invention, in the multi-gasification combined cycle power generation system according to the fourth aspect of the present invention, the outflow control device includes a load command value, a gasification fuel flow rate, and a purified gas flow rate of the gasification facility. The output of the gas turbine or the flow rate according to the output command value is corrected using at least one of the opening degree of the gasification fuel control valve and the command value of the gasification fuel control valve.

According to the combined gasification combined cycle power plant of the seventh aspect of the present invention, in addition to the operation of the fourth aspect of the present invention, the outflow control device further includes a load command value of the gasification facility, a gasified fuel flow rate, and purification. Using at least one of the gas flow rate, the opening degree of the gasification fuel control valve, and the command value of the gasification fuel control valve,
Correct the opening of the outflow control valve.

The multi-line integrated gasification combined cycle facility according to the invention of claim 8 is the invention according to any one of claims 1 to 3, wherein water or steam is supplied from the gasification facility to the gas turbine facility. An inflow control valve is installed at an inlet of each gas turbine facility of a supply system, and an inflow control device that controls the inflow control valve at a flow rate or a pressure according to an output of the gas turbine or an output command value is provided. And

According to the multi-line combined gasification combined cycle facility according to the eighth aspect of the present invention, in addition to the operation of any one of the first to third aspects of the invention, water is supplied from the gasification facility to the gas turbine facility. Alternatively, the flow rate of the steam is controlled by controlling the inflow regulating valve by the inflow control device, so that the flow rate corresponds to the output of the gas turbine or the output command value.

According to a ninth aspect of the present invention, in the multi-gasification combined cycle power generation system according to the eighth aspect of the present invention, the inflow control device may include at least one of atmospheric temperature, atmospheric humidity and atmospheric pressure.
One or more are used to correct the flow rate or pressure according to the output of the gas turbine or the output command value.

According to the multi-stream combined gasification combined cycle facility of the ninth aspect of the present invention, in addition to the function of the eighth aspect, the inflow control device controls at least one of atmospheric temperature, atmospheric humidity and atmospheric pressure. Used to correct the opening of the inflow control valve.

According to a tenth aspect of the present invention, in the multi-gasification combined cycle power generation system according to the eighth aspect of the present invention, the inflow control device includes a gas turbine exhaust gas flow rate instead of a gas turbine output or an output command value. , Using at least one of the exhaust gas temperature and the drum pressure of the exhaust heat recovery boiler,
The method is characterized in that the flow rate or the pressure is calculated.

According to the combined gasification combined cycle power plant of the tenth aspect, in addition to the effect of the eighth aspect,
In the inflow control device, instead of the gas turbine output or output command value, the gas turbine exhaust gas flow rate, exhaust gas temperature,
The flow rate or pressure is calculated using at least one or more of the drum pressures of the heat recovery steam generator.

According to the eleventh aspect of the present invention, in the multi-line combined gasification combined cycle facility according to the eighth aspect of the present invention, the inflow control device includes a load command value of the gasification facility, a gasification fuel flow rate, and a purified gas flow rate. The output of the gas turbine or the flow rate according to the output command value is corrected using at least one of the opening degree of the gasification fuel control valve and the command value of the gasification fuel control valve.

According to the multi-line integrated gasification combined cycle system of the eleventh aspect, in addition to the effect of the eighth aspect,
The inflow controller uses at least one of a load command value of the gasification facility, a gasification fuel flow rate, a purified gas flow rate, an opening of the gasification fuel control valve, and a command value of the gasification fuel control valve. Correct the opening of the control valve.

According to a twelfth aspect of the present invention, in the multi-stream integrated gasification combined cycle system according to the eighth aspect, the inflow control device uses a steam flow rate generated from the steam drum of the exhaust heat recovery boiler. Thus, the flow rate or the pressure according to the output of the gas turbine or the output command value is limited.

According to the multi-line integrated gasification combined cycle facility according to the twelfth aspect, in addition to the effect of the eighth aspect,
The inflow control device limits the flow rate or the pressure corresponding to the output of the gas turbine or the output command value by using the steam flow rate generated from the steam drum of the exhaust heat recovery boiler.

According to a thirteenth aspect of the present invention, in the multi-line integrated gasification combined cycle facility according to the eighth aspect of the present invention, the inflow control device includes a model simulating a dynamic characteristic of water supply from the gasification facility. It is characterized by having.

According to the multi-gasification combined cycle power plant of the thirteenth aspect, in addition to the effect of the eighth aspect,
The inflow controller uses a model simulating the dynamic characteristics of the feedwater from the gasification facility to calculate an inflow rate set value in consideration of the delay of the gasification facility.

According to a fourteenth aspect of the present invention, there is provided a multi-line integrated gasification combined cycle power plant according to any one of the first to third aspects, wherein water is supplied from the gas turbine facility to the gasification facility. Installing an outflow control valve at the outlet of each gas turbine facility of the system, installing an inflow control valve at the inlet of each gas turbine facility of the system that supplies water or steam from the gasification facility to the gas turbine facility, An outflow / inflow control device for controlling the outflow control valve or the inflow control valve at a flow rate or a pressure corresponding to the output of the gas turbine is provided.

According to the multi-line integrated gasification combined cycle facility according to the fourteenth aspect of the present invention, in addition to the operation of any one of the first to third aspects, water is supplied from the gas turbine facility to the gasification facility. An outflow control valve is installed at the outlet of each gas turbine facility of the system that supplies water, and an inflow control valve is installed at the inlet of each gas turbine facility of the system that supplies water or steam from the gasification facility to the gas turbine facility. The outflow / inflow control device controls the outflow control valve at a flow rate or pressure corresponding to the output of the gas turbine, and controls the flow rate of water supplied from the gas turbine equipment to the gasification equipment. Also,
The inlet control valve is controlled to control water or steam supplied from the gasification facility to the gas turbine facility.

[0053] The multi-line combined gasification combined cycle power plant according to the invention of claim 15 is the system according to any one of claims 1 to 3, wherein the system supplies water from the gas turbine facility to the gasification facility. An outflow header control valve is provided after the merging, and an outflow header control device for controlling the outflow header control valve by a pressure on the secondary side of the outflow header control valve is provided.

According to the fifteenth aspect of the present invention, in addition to the function of any one of the first to third aspects, the outflow header control device further comprises an outflow header control valve. The outflow header control valve is controlled by the pressure on the secondary side of, and water supplied from the gas turbine equipment to the gasification equipment is adjusted.

[0055]

Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of a multi-line integrated gasification combined cycle power plant according to the first embodiment of the present invention. As shown in FIG. 1, three gas turbine facilities 8 are provided for one gasification facility 1. In addition, steam turbine equipment 2
0 is composed of one unit.

In FIG. 1, gasification equipment 1, each gas turbine equipment 8a, 8b, 8c, and steam turbine equipment 20
Has the same configuration as the conventional example shown in FIG. Water supplied from each of the gas turbine facilities 8a, 8b, 8c to the gasification facility 1 is supplied to each of the gas turbine facilities 8a, 8b, 8c.
The outlets a, 8b, and 8c are configured to meet each other, and are supplied to the gas cooler 6 of the gasification facility 1 through the outflow header 28. In addition, from the gas cooler 6 of the gasification furnace facility 1 to the respective gas turbine facilities 8a, 8b,
8c is supplied with water or steam after the heat exchange.

That is, the outflow of feedwater from the gas turbine facility 8 to the gasification facility 1 is caused by the first gas turbine facility 8
a, are merged at the outlet side of the second gas turbine equipment 8b and the third gas turbine equipment 8c, and supplied to the gasification equipment 1 through the outflow header 28.

As described above, according to the first embodiment, by installing the common outflow header 28,
Water can be supplied from the gas turbine facility 8 to the gasification facility 1 even if the number of the gasification facilities 1 and the number of the gas turbine facilities 8 are different.

Next, a second embodiment of the present invention will be described. FIG. 2 is a configuration diagram of a multi-line combined gasification power generation system according to the second embodiment of the present invention. As shown in FIG. 2, one gas turbine facility 8 is provided for two gasification facilities 1. In addition, the steam turbine equipment 20
Are composed of one unit.

In FIG. 2, each gasification facility 1a, 1
b, the gas turbine equipment 8, and the steam turbine equipment 20 are configured in the same manner as the conventional example shown in FIG. And
Water or steam supplied from the gas cooler 6 of each gasification facility 1a, 1b to the gas turbine equipment 8 is configured to join at the outlet of each gasification facility 1a, 1b, and the gas turbine equipment 8 is supplied through the inflow header 29. It is supplied to. Further, water is supplied from the gas turbine facility 8 to each of the gasification facilities 1a and 1b.

That is, the supply of water or the flow of steam from each of the gasification facilities 1a and 1b to the gas turbine facility 8 is combined at the outlet side of the first gasification facility 1a and the second gasification facility 1b, The gas is supplied to the gas turbine equipment 8 via the header 29.

As described above, according to the second embodiment, by installing the inflow header 29, even if the number of the gasification facilities 1 and the number of the gas turbine facilities 8 are different, the gasification facilities 1 Water supply or steam can flow into the gas turbine facility 8.

Next, a third embodiment of the present invention will be described. FIG. 3 is a configuration diagram of a multi-line integrated gasification combined cycle facility according to the third embodiment of the present invention. As shown in FIG. 3, three gas turbine facilities 8 are provided for two gasification facilities 1. In addition, the steam turbine equipment 20
Are composed of one unit.

In FIG. 3, each gasification facility 1a, 1
b, the gas turbine equipment 8a, 8b, 8c, and the steam turbine equipment 20 are configured similarly to the conventional example shown in FIG.

Then, the gas turbine facilities 8a, 8b, 8
The outflow of feedwater from c to the gasification facilities 1a and 1b is caused by the first gas turbine facility 8a, the second gas turbine facility 8b,
At the outlet side of the third gas turbine facility 8c, they are merged and supplied to the gasification facilities 1a, 1b via the outflow header 28.
a, 8b, 8c are supplied to the first gasification facility 1
a, merging at the outlet side of the second gasification facility 1 b, and supplying to the gas turbine facility 8 via the inflow header 29.

That is, the gas turbine facilities 8a, 8b,
The water supplied from 8c to the gasification equipment 1a, 1b is joined at the outlet of the gas turbine equipment 8a, 8b, 8c and supplied to each gasification equipment 1a, 1b through the outflow header 28. On the other hand, water or steam supplied from the gasification equipment 1a, 1b to each gas turbine equipment 8a, 8b, 8c joins at the outlet of each gasification equipment 1a, 1b,
9 to each gas turbine facility 8a, 8b, 8c.

As described above, according to the third embodiment, by installing the outflow header 28 and the inflow header 29, even if the number of gasification facilities 1 and the number of gas turbine facilities 8 are different, the gas The water supply can flow out of the turbine facility 8 to the gasification facility 1, and the water supply or steam can flow out of the gasification facility 1 to the gas turbine facility 8.

Next, a fourth embodiment of the present invention will be described. FIG. 4 is a configuration diagram of a multi-line combined gasification combined cycle power plant according to the fourth embodiment of the present invention. This fourth embodiment is different from the third embodiment shown in FIG. 3 in that an outflow control valve 30, an outflow control device 32, an outflow flow detector 33,
An outflow pressure detector 34 is additionally provided. Then, the gasification equipment 1a, 1
This is to adjust the flow rate of the supply water supplied to b.

In FIG. 4, an outflow control valve 30 for adjusting the flow rate of the feedwater flowing out to the gasification facility 1 and a flow control valve 30 for adjusting the flow rate of the feedwater flowing out to the gasification facility 1 are connected to a system that feeds water from the gas turbine facility 8 to the gasification facility 1. An outflow control device 32 for controlling is newly installed. Further, the outflow flow rate of the feedwater is detected by the outflow flow rate detector 33, and the outflow pressure of the feedwater is detected by the outflow pressure detector 34, and is used for control by the outflow control device 32.

FIG. 5 is a block diagram of an outflow control device according to a fourth embodiment of the present invention. In FIG. 5A, the outflow control device 32 controls the outflow control valve 30 at a flow rate corresponding to the output of the gas turbine or the output command value S. That is, the output or the output command value S of the gas turbine is input to the function generator 51 of the outflow control device 32, and the function generator 51 outputs the outflow flow rate set value Q0 corresponding to the output or the output command value S of the gas turbine. Is done.

That is, in the function generator 51, the relationship between the output of the gas turbine determined in advance by heat balance or the like and the flow rate to the gasification facility 1 which is the most efficient as a plant is set. The output or the flow rate according to the input of the output command value S is set to the outflow flow rate set value Q0.
Output as The function generator 53 has an opening for the flow rate of the outflow control valve 30 set in advance, inputs the outflow flow rate set value Q0, and outputs the opening degree of the outflow control valve 30 corresponding to this flow rate. Output to the outflow control valve 30 as an operation signal.

In the outflow control device 32 of FIG. 5B, the signal from the outflow flow rate detector 33 is input to the subtractor 54, and the signal is calculated in the same manner as the outflow control device 32 of FIG. 5A. The deviation from the outflow flow rate set value Q0 is calculated, and the PI calculator 55 calculates the deviation so that the deviation disappears.
An operation signal is output to.

In the outflow control device 32 shown in FIG. 5C, the function generator 56 supplies the output of the gas turbine determined in advance by heat balance and the like to the outflow to the gasification facility 1 which is the most efficient as a plant. A pressure relationship is set, and an outflow pressure set value P0 corresponding to the gas turbine output is output based on the output of the gas turbine or the output command value S. The difference between the signal from the outflow pressure detector 34 and the outflow pressure set value P0 is obtained by a subtractor 54, and a PI calculator 55
Outputs an operation signal to the outflow control valve 30 so as to eliminate the deviation.

As described above, according to the fourth embodiment, the outflow flow rate or pressure with respect to the gasification facility 1 is controlled by the outflow control valve 30 installed in the system for supplying water to the gasification facility 1. In order to be able to control with the optimal amount corresponding to the gas turbine output, even if the output of the gas turbine 12 is unbalanced in each axis, the plant is operated at the predetermined most efficient operating point. It is possible to do.

Next, a fifth embodiment of the present invention will be described. FIG. 6 is a block diagram of the outflow control device 32 according to the fifth embodiment of the present invention. In the fifth embodiment, at least one of the atmospheric temperature, the atmospheric humidity, and the atmospheric pressure (atmospheric condition T) is used for the outflow control device 32 in the fourth embodiment shown in FIG. The flow rate is corrected in accordance with the output of the gas turbine or the output command value.

The feedwater flow rate or pressure to be supplied to the gasification facility 1 is determined on the basis of the planned value based on the output of the gas turbine 12 and the heat balance. However, if the atmospheric conditions are different from the planned values, even if the output of the same gas turbine 12 is the same. Outflow rates may vary.

Therefore, in the outflow control device 32 according to the fifth embodiment, in order to improve the accuracy of the outflow control,
Similarly to the outflow control device 32 according to the fourth embodiment, a signal T representing the atmospheric conditions such as the atmospheric temperature, the atmospheric humidity, the atmospheric pressure, etc., with respect to the calculated outflow flow rate set value Q0 or outflow pressure set value P0. Is corrected by

In FIG. 6A, the outflow control device 3
In 2, in the same manner as the outflow control device 32 of FIG. 5A of the fourth embodiment, the outflow flow rate set value Q0 is calculated by the function generator 51. Then, the calculator 58 sets the outflow flow rate set value Q0
, A correction operation is performed using a signal T representing the atmospheric condition, and an outflow flow rate set value 59 corrected based on the atmospheric condition is output. The method of the correction calculation can be obtained by a function or a polynomial approximation from a plan value such as a heat balance. The following is the same as in the case of FIG.
Thus, the opening degree of the outflow control valve 30 corresponding to the outflow flow rate set value 59 is output and output to the outflow control valve 30 as an operation signal.

Also, in the outflow control device 32 of FIG. 6B, the outflow flow rate set value 59 corrected according to the atmospheric conditions is calculated in the same manner as in the case of FIG. Similarly to the case, the outflow control valve 30 is controlled by the outflow flow rate detector 33 and the outflow flow rate set value 59 corrected by the atmospheric condition.

In the outflow control device 32 shown in FIG. 6C, the computing unit 60 sets the outflow pressure set value P0 to
The correction operation is performed by the signal T representing the atmospheric condition, and the outlet pressure set value 61 corrected by the atmospheric condition is output.
The following operates in the same manner as in FIG. 5C, and is controlled by the outflow control valve 30.

As described above, according to the fifth embodiment, even when the atmospheric condition deviates from the planned point, it is possible to accurately calculate the outflow flow rate or the outflow pressure to be supplied to the gasification facility 1. Because of this, control is performed, so that the plant can be operated at an optimum operating point regardless of a shift in atmospheric conditions.

Next, a sixth embodiment of the present invention will be described. FIG. 7 is a block configuration diagram of the outflow control device 32 according to the sixth embodiment of the present invention. The sixth embodiment differs from the outflow control device 32 in the fourth embodiment shown in FIG. 5 in that, instead of the gas turbine output or output command value, the gas turbine exhaust gas flow rate, exhaust gas temperature,
The flow rate or the pressure is calculated using at least one of the drum pressures of the exhaust heat recovery boiler.

That is, the outflow control device 32 replaces the gas turbine output or the output command value S with the exhaust gas flow rate, the exhaust gas temperature, or the exhaust heat recovery boiler 14 of the gas turbine 12 essential for the operation of the gas turbine equipment 8. A signal F representing the plant state of the gas turbine equipment such as the pressure of the steam drum 19 is input and used.

In the outflow control device 32 shown in FIG.
The required flow rate to the gasification facility 1 corresponding to the signal 36 representing the plant state of the gas turbine facility 8 is set in the function generator 62 in advance.
The output flow rate set value Q0 is output by the signal 36 representative of the plant state of FIG.
It operates in the same manner as the outflow control device 32 of (a), and controls the outflow control valve 30.

In the outflow control device 32 shown in FIG.
As in the case of the outflow control device 32 in FIG. 7A, the outflow flow rate set value Q0 is calculated from the signal 36 representing the plant state of the gas turbine equipment 8 via the function generator 62. The following is similar to the outflow control device 32 of FIG.
Control.

In the outflow control device 32 shown in FIG.
The required output pressure to the gasification facility 1 corresponding to the signal 36 representing the plant state of the gas turbine facility 8 is set in the function generator 63 in advance, and the signal 36 representing the plant state of the gas turbine facility 8 is set. The output pressure set value P0 is output by the control of the outlet control valve 30 in the same manner as the outlet control device 32 shown in FIG.

As described above, according to the sixth embodiment, even if the output of the gas turbine or the output command value S is not bothersomely used, the gas turbine equipment which always exists in the operation of the gas turbine equipment 8 can be used. By using the signal F representative of the plant state of the fourth embodiment, it is possible to provide an inexpensive outflow control device having the same function as the outflow control device 32 of the fourth embodiment.

Next, a seventh embodiment of the present invention will be described. FIG. 8 is a block diagram of the outflow control device 32 according to the seventh embodiment of the present invention. This seventh embodiment is different from the outflow control device 32 in the fourth embodiment shown in FIG. 5 in that a load command value of a gasification facility, a gasification fuel flow rate, a purified gas flow rate, a gasification fuel control valve is provided. The output of the gas turbine or the flow rate according to the output command value is corrected using the opening degree of the gas turbine or the command value of the gasification fuel control valve.

Since the outflow flow rate or pressure to be supplied to the gasification facility 1 is different from the planned value depending on the operation state of the gasification facility 1, the outflow control device 32 in the seventh embodiment is different from the outflow control device in the seventh embodiment. At 32, the plant state of the gasification facility such as the load command value of the gasification facility 1, the gasification fuel flow rate, the purified gas flow rate, the opening of the gasification fuel control valve 3, the command value of the gasification fuel control valve 3, etc. is represented. The outflow flow rate set value Q0 or the outflow pressure set value P0 is corrected using the signal G to be output.

In the outflow control device 32 shown in FIG.
Similar to the outflow control device 32 of FIG. 5A according to the fourth embodiment, the outflow flow rate set value Q0 is calculated by the function generator 51. The computing unit 64 performs a correction operation on the outflow flow rate set value Q0 based on the signal 37 representing the plant state of the gasification equipment 1 and outputs an outflow flow rate set value 65 corrected according to the state of the gasification equipment 1. . And the function generator 5
The outflow control valve 30 is controlled at the valve opening corresponding to the outflow flow rate set value 65 corrected in step 3.

In the outflow control device 32 shown in FIG.
As with the outflow control device 32 of FIG.
Outflow flow rate set value 65 corrected by the state of
The following works in the same way as the outflow control device 32 of FIG.
The outflow control valve 30 is controlled.

In the outflow control device 32 shown in FIG.
The outlet pressure set value P0 is calculated in the same manner as the outlet control device 32 of FIG. 5C, and the calculator 66 corrects the outlet pressure set value P0 based on the signal 37 representing the plant state of the gasification facility 1. Is performed, and an outflow pressure set value 67 corrected according to the state of the gasification facility 1 is output. Figure 5 below
It operates similarly to the outflow control device 32 of (c), and controls the outflow control valve 30.

As described above, according to the seventh embodiment, not only the operation state of the gas turbine equipment 8 but also
The feedwater flow rate or pressure in consideration of the operation state of the gasification facility 1 can be supplied to the gasification facility 1, and the plant can be operated at a more efficient operating point.

Next, an eighth embodiment of the present invention will be described. FIG. 9 is a configuration diagram of a multi-line combined gasification combined cycle facility according to an eighth embodiment of the present invention. This eighth embodiment is different from the third embodiment shown in FIG. 3 in that an inflow control valve 38, an inflow control device 39, an inflow flow detector 40,
In this embodiment, an inflow pressure detector 41 and a steam flow rate detector 42 are additionally provided. And each gasification equipment 1a, 1b
The flow rate of water or steam to be supplied to the gas turbine equipment 8 is adjusted.

In FIG. 9, an inflow control valve 38 for adjusting the flow of water or steam flowing into the gas turbine equipment 8 is provided to a system for feeding water or steam from the gasification equipment 1 to the gas turbine equipment 8. An inflow control device 39 for controlling the inflow control valve 38 is newly installed. The inflow of water or steam is detected by an inflow detector 40, the inflow pressure of water or steam is detected by an inflow pressure detector 41, and the flow of steam from the steam drum 19 is detected by a steam flow detector 42. And is used for control by the inflow control device 39.

FIG. 10 is a block diagram of an inflow control device 39 according to an eighth embodiment of the present invention. FIG.
In (a), the inflow control device 39 controls the inflow control valve 38 so that the flow rate or the pressure becomes in accordance with the output of the gas turbine or the output command value S.

That is, the output of the gas turbine or the output command value S is input to the function generator 68 of the inflow control device 39. In the function generator 68, the relationship between the output of the gas turbine determined in advance by heat balance or the like and the flow rate into the gas turbine equipment 8 which is the most efficient as a plant is set, and the output of the gas turbine or the output command value S Is output as the inflow flow rate set value R0. The function generator 70 is preset with an opening relative to the flow rate of the inflow control valve 38, inputs the inflow flow rate set value R0, outputs the opening degree of the inflow control valve 38 according to this flow rate, and controls the inflow control. The output is performed as an operation signal to the valve 38.

In the inflow control device 39 shown in FIG. 10B, the signal from the inflow rate detector 40 is subtracted by a subtractor 54.
And calculates a deviation from the inflow flow rate set value R0 calculated in the same manner as the inflow control device 39 of FIG.
The I calculator 55 outputs an operation signal to the inflow control valve 38 so as to eliminate the deviation.

In the inflow control device 39 shown in FIG. 10C, the function generator 71 has the output of the gas turbine determined in advance by heat balance or the like and the inflow pressure into the gasification equipment 1 which is the most efficient as a plant. Is set, and based on the output of the gas turbine or the output command value S, an inflow pressure set value J0 corresponding to the output of the gas turbine is output. The difference between the signal from the inflow pressure detector 41 and the inflow pressure set value J0 is obtained by the subtractor 54, and the PI calculator 5
5 outputs an operation signal to the inflow control valve 38 so as to eliminate the deviation.

As described above, according to the eighth embodiment, the inflow control valve 38 installed in the system for supplying water or steam to the gas turbine facility 8 controls the inflow rate or the inflow rate into the gas turbine facility 8. Since it is possible to control the pressure with an optimal amount corresponding to the gas turbine output, even if the output of the gas turbine 12 is unbalanced in each shaft, the plant can be controlled at the predetermined most efficient operating point. Can be driven.

Next, a ninth embodiment of the present invention will be described. FIG. 11 is a block diagram of the inflow control device 39 according to the ninth embodiment of the present invention. In the ninth embodiment, at least one of the atmospheric temperature, the atmospheric humidity, and the atmospheric pressure (atmospheric condition T) is used for the inflow control device 39 in the ninth embodiment shown in FIG. , The flow rate or the pressure corresponding to the output of the gas turbine or the output command value is corrected.

The flow rate or pressure of the water or steam to be supplied to the gas turbine equipment 8 is determined on the basis of a plan value based on the output of the gas turbine 12 and heat balance, but if the atmospheric conditions differ from the plan values, the same gas turbine 12 In some cases, the outflow flow rate may be different even when the output is.

Therefore, in the inflow control device 39 according to the ninth embodiment, in order to improve the accuracy of the inflow control,
With respect to the inflow rate set value R0 or the inflow pressure set value J0 calculated similarly to the inflow control device 39 of FIG.
Correction is performed by a signal T representing atmospheric conditions such as atmospheric temperature, atmospheric humidity, and atmospheric pressure.

In FIG. 11A, an inflow flow rate set value R0 is calculated as in the inflow control device 39 of FIG. 10A. The computing unit 73 performs a correction operation on the inflow rate set value R0 using a signal T representing the atmospheric condition, and outputs an inflow rate set value R1 corrected based on the atmospheric condition T. The method of the correction calculation can be obtained by a function or a polynomial approximation from a plan value such as a heat balance. The following functions in the same manner as the inflow control device 39 in FIG. 10A, and outputs the opening of the inflow control valve 38 by the function generator 70 and outputs it as an operation signal to the inflow control valve 38.

In FIG. 11B, similarly to the inflow control device 39 of FIG. 11A, an inflow flow rate set value R1 corrected based on the atmospheric condition T is calculated, and the inflow flow rate is set similarly to FIG. 10B. The inflow control valve 38 is controlled by the flow rate detector 40 and the inflow rate set value R1 corrected by the atmospheric conditions.

In FIG. 11 (c), a computing unit 75 corrects the inflow pressure set value J0 by a signal T representing the atmospheric condition similarly to the computing unit 73 in the inflow control device 39 of FIG. 11 (a). The calculation is performed, and the inflow pressure set value J1 corrected according to the atmospheric conditions is output. Figure 10 below
Similarly to (c), the inflow control valve 38 is controlled by the inflow pressure set value J1 corrected by the atmospheric condition and the pressure signal from the inflow pressure detector 41.

As described above, according to the ninth embodiment, even when the atmospheric condition deviates from the planned point, the inflow rate or the inflow pressure to be supplied to the gas turbine equipment 8 is calculated with high accuracy. Because of this, control is performed, so that the plant can be operated at an optimum operating point regardless of a shift in atmospheric conditions.

Next, a tenth embodiment of the present invention will be described. FIG. 12 is a block diagram of the inflow control device 39 according to the tenth embodiment of the present invention. This tenth
This embodiment is different from the inflow control device 39 in the eighth embodiment shown in FIG. 10 in that the exhaust gas flow rate, the exhaust gas temperature, and the exhaust heat recovery boiler of the gas turbine are replaced with the output or the output command value of the gas turbine. At least one of the drum pressures
One or more are used to calculate the flow rate or pressure.

In other words, the inflow control device 39 replaces the gas turbine output or the output command value S with the exhaust gas flow rate, exhaust gas temperature, or exhaust heat recovery boiler 14 of the gas turbine 12 essential for the operation of the gas turbine 12. A signal F representing the plant state of the gas turbine equipment such as the pressure of the steam drum 19 is input and used.

In the inflow control device 39 shown in FIG. 12A, the required flow rate into the gas turbine equipment 8 corresponding to the signal F representing the plant state of the gas turbine equipment is set in the function generator 77 in advance. Then, an inflow flow rate set value R0 is output by a signal F representing the plant state of the gas turbine equipment, and the inflow control device 3 shown in FIG.
9 and controls the inflow control valve 38.

In the inflow control device 39 shown in FIG. 12B, the flow rate of the inflow from the signal F representing the plant state of the gas turbine equipment is transmitted via the function generator 77 similarly to the inflow control device 39 shown in FIG. Calculate the set value R0. Hereinafter, the control of the inflow control valve 38 is performed similarly to the inflow control device 39 of FIG.

In the inflow control device 39 shown in FIG. 12C, the function generator 78 has the gas turbine equipment 8 corresponding to the signal F representing the plant state of the gas turbine equipment in advance.
The required inflow pressure to the gas turbine is set, and the inflow pressure set value J0 is output by a signal F representing the plant state of the gas turbine equipment.
Similarly, the control of the inflow control valve 38 is performed.

As described above, according to the tenth embodiment, even if the output of the gas turbine or the output command value S is not bothersome, the gas turbine equipment which is always present in the operation of the gas turbine equipment 8 can be used. By using the signal F representing the plant state of the above, the inflow control device 39 having the same function as that of the eighth embodiment and being inexpensive can be obtained.

Next, an eleventh embodiment of the present invention will be described. FIG. 13 is a block diagram of the inflow control device 39 according to the eleventh embodiment of the present invention. This eleventh
This embodiment is different from the inflow control device 39 in the eighth embodiment shown in FIG. 10 in that the load command value of the gasification facility, the gasification fuel flow rate, the purified gas flow rate, and the opening degree of the gasification fuel control valve are provided. In addition, the output of the gas turbine or the flow rate according to the output command value is corrected using at least one or more of the command values of the gasification fuel control valve.

Since the inflow rate or pressure to be supplied to the gas turbine equipment 8 is different from the planned value depending on the operation state of the gasification equipment 1, in the eleventh embodiment,
The inflow control device 39 is a plant of the gasification facility such as a load command value of the gasification facility 1, a gasification fuel flow rate, a purified gas flow rate, an opening degree of the gasification fuel control valve 3, a command value of the gasification fuel control valve 3, and the like. The configuration is such that the inflow rate set value R0 or the inflow pressure set value J0 is corrected using the signal G representing the state.

In the inflow control device 39 of FIG. 13A, the inflow rate set value R0 is calculated by the function generator 68 similarly to the inflow control device 39 of FIG. The computing unit 79 performs a correction operation on the inflow rate set value R0 based on the signal G representing the plant state of the gasification facility, and outputs an inflow rate set value R2 corrected according to the state of the gasification facility. The following operates in the same manner as the inflow control device 39 in FIG. 10A, and controls the inflow control valve 38.

In the inflow control device 39 of FIG. 13 (b), an inflow flow rate set value R2 corrected according to the state of the gasification facility is calculated in the same manner as the inflow control device 39 of FIG. 13 (a). It operates in the same manner as the inflow control device 39 of (b), and controls the inflow control valve 38.

In the inflow control device 39 of FIG. 13C, the inflow pressure set value J0 is calculated in the same manner as in the inflow control device 39 of FIG. 10A, and the calculator 81 represents the plant state of the gasification facility. The signal G sets the inflow pressure set value J0
, And outputs an inflow pressure set value J2 corrected according to the state of the gasification facility. Figure 10 below
The same operation as in (c) is performed to control the inflow control valve 38.

As described above, according to the eleventh embodiment, not only the operation state of the gas turbine equipment 8 but also the feedwater flow rate or the pressure in consideration of the operation state of the gasification equipment 1 are used. And the plant can be operated at a more efficient operating point.

Next, a twelfth embodiment of the present invention will be described. FIG. 14 is a block diagram of an inflow control device 39 according to a twelfth embodiment of the present invention. This twelfth
This embodiment uses the steam flow rate generated from the steam drum of the exhaust heat recovery boiler for the inflow control device 39 in the eighth embodiment shown in FIG. In this case, the flow rate or the pressure according to the pressure is limited.

[0121] If the level of the steam drum 19 of the exhaust heat recovery boiler 14 is too high or too low, there is a problem in plant operation. Therefore, it is necessary to keep the level constantly,
A water supply control valve 26 is provided in a water supply system to the steam drum 19, and is controlled by a level signal from a drum level detector 27. In order to keep the level constant, supply water equivalent to the amount of steam generated from the steam drum 19 must be supplied to the steam drum 1.
9 and the generated steam amount depends on the exhaust heat recovery boiler 14.
Is determined by the operating state of the vehicle.

On the other hand, water is supplied to the steam drum 19 through the inflow control valve 38. Here, the amount of steam generated by the steam drum 19 is X, the amount of water supplied from the water supply control valve 26 is W1,
If the amount of water supplied from the inflow control valve 38 is W2, X = W1
If + W2 is always established, the level of the steam drum 19 will always be constant.

However, the flow rate W2 from the inflow control valve 38 is basically determined regardless of the state of the exhaust heat recovery boiler 14, in other words, regardless of the generated steam amount X. And the control of the inflow control valve 38 may interfere with each other.

For example, when W2 increases, X <W1 + W2
Therefore, the water supply control valve 26 is closed to set X1 = W1 + W2, and W1 is decreased. When the water supply control valve 26 is fully closed, W1 becomes zero.
If 1 <W2, the level continues to decrease, and plant operation becomes difficult. When W2 decreases, on the contrary,
The water supply control valve 26 performs an opening operation to increase W1. When the water supply control valve 26 is fully opened, W1 is constant (referred to as W12).
However, if X1−W12 <X2, the level continues to rise, and the plant operation is again difficult. Therefore, in order to continue the operation of the plant, X1 ≧ X2 ≧ X
1-W12 must always be satisfied.

Therefore, in the inflow control device 39 according to the twelfth embodiment, the steam drum 1 of the exhaust heat recovery boiler 14 is used.
The steam flow rate detector 42 for detecting the steam flow rate generated from 9 is newly installed, and the steam flow rate signal X from the steam flow rate detector 42 is used to limit the inflow rate set value R0. I have.

In the inflow control device 39 of FIG. 14A, the flow rate W12 when the water supply control valve 26 is fully opened is set in the signal generator 83 in advance, and the subtractor 84 receives the flow rate from the steam flow rate detector 42. Feed water control valve 26 from steam flow signal X
Reduce the flow when fully open. In the low value selector 85, FIG.
As shown in (a), the inflow control device 39 selects a low value of the inflow flow rate set value R0 and the steam flow signal X, and the high value selector 86 further selects a high value of the output of the subtractor 84. Thus, X1 ≧ X2 ≧ X1−W12
2, ie, the inflow rate setting value R3 can be obtained.
Then, the control of the inflow control valve 38 is performed in the same manner as in the inflow control device 39 of FIG.

In the inflow control device 39 of FIG. 14B, the inflow flow rate set value R3 is calculated in the same manner as in the inflow control device 39 of FIG. 14A. , And controls the inflow control valve 38 based on the flow signal from the inflow flow detector 40.

In the inflow control device 39 shown in FIG. 14C, the relationship between the inflow rate set value R3 and the inflow pressure set value is set in the function generator 88, and the inflow control shown in FIG. Inflow flow rate set value R obtained in the same manner as in device 39
3 is input, and the inflow pressure set value J3 is output. The following is
It operates in the same manner as the inflow control device 39 in FIG. 10C, and controls the inflow control valve 38 based on the pressure signal from the inflow pressure detector 41.

As described above, according to the twelfth embodiment, the operation of the plant can be continued at the optimum operating point without interfering with the control of the water supply control valve 26.

Next, a thirteenth embodiment of the present invention will be described. FIG. 15 is a block diagram of the inflow control device 39 according to the thirteenth embodiment of the present invention. This thirteenth
In this embodiment, a model simulating the dynamic characteristics of water supplied from gasification equipment is provided in the inflow control device 39 of the eighth embodiment shown in FIG.

The gas turbine 12 responds to a rapid output change by
Since a delay occurs in the inflow flow rate from the gasification facility 1, the controllability deteriorates when the output of the gas turbine 12 changes. Therefore, in the inflow control device 39 according to the thirteenth embodiment, a gasification facility flow model 90 that simulates the dynamic characteristic (delay) of the water supply of the gasification facility 1 is newly installed.

In the inflow control device 39 shown in FIG. 15A, the gasification facility
A model that simulates a delay in water supply is set. This model is a model of a delay in the amount of inflow from the gasification facility 1 with respect to a change in the output of the gas turbine 12, and is expressed by, for example, a dead time and a first-order delay.

The flow generator set value R0 is obtained by the function generator 68 as in the flow controller 39 shown in FIG. This inflow flow rate set value R0 is input to the gasification equipment flow rate model 90, and an inflow flow rate set value R4 that takes into account the delay of the gasification equipment with respect to the change in output of the gas turbine 12 can be obtained. Hereinafter, similarly to FIG. 10A, the control of the inflow control valve 38 is performed so as to coincide with the inflow flow rate set value R0.

In the inflow control device 39 of FIG. 10B, the inflow control device 39 of FIG.
The inflow flow rate set value R4 in consideration of the delay of the gasification facility is obtained, and the inflow control valve 38 is controlled by a signal from the inflow flow rate detector 40 in the same manner as in FIG.

In the inflow control device 39 shown in FIG. 15C, a model simulating a delay in water supply to the gasification facility 1 is set in advance in the gasification facility pressure model 92. This model is a model of a delay of the inflow pressure from the gasification facility 1 with respect to a change in the output of the gas turbine 12, and is expressed by, for example, a dead time and a first-order delay.
The inflow pressure set value J0 is obtained in the same manner as the inflow control device 39 of FIG. 10 (c), and the obtained inflow pressure set value J0 is input to the gasification equipment pressure model 92, and the inflow pressure set value J4 considering the delay of the gasification equipment is mainly used. The following operates in the same manner as the inflow control device 39 of FIG. 10C, and controls the inflow control valve 38 by the pressure signal from the inflow pressure detector 41.

As described above, according to the thirteenth embodiment, even when the output of the gas turbine 12 changes rapidly, the control is performed with the optimum inflow rate or pressure, so that the controllability is improved and the gas turbine 12 is more improved. The plant can be operated at the operating point.

In the above description, the inflow rate setting value R
Although the delay of the gasification facility 1 is considered with respect to 0 or the inflow pressure set value J0, the same effect can be obtained by considering the delay of the gasification facility 1 with respect to the operation signal for each inflow control valve 38. it can.

Next, a fourteenth embodiment of the present invention will be described. FIG. 16 is a configuration diagram of a multi-line combined gasification combined cycle power plant according to a fourteenth embodiment of the present invention. This first
The fourth embodiment differs from the third embodiment shown in FIG. 3 in that the outflow control valve 30, the outflow flow detector 33, the outflow pressure detector 34, the inflow control valve 38, the inflow flow detector 40, the inflow A pressure detector 41 and an outflow / inflow control device 43 are additionally provided. The outflow / inflow control device 43 controls the outflow control valve 3 at a flow rate or a pressure corresponding to the output of the gas turbine.
0 and the inflow control valve 38 are controlled.

In FIG. 16, in the system for supplying water from the gas turbine equipment 8 to the gasification equipment 1, an outflow control valve 30 for adjusting the flow rate of water supplied to the gasification equipment 1 is provided. An inflow control valve 38 for adjusting the flow rate of feedwater or steam flowing into the gas turbine facility 8 to a system that feeds water or steam into the gas turbine facility 8.
And an outflow / inflow control device 43 for controlling the outflow control valve 30 or the inflow control valve 38 is newly installed.

The outflow flow rate of the feedwater is measured by the outflow flow rate detector 3
The outflow pressure of the feedwater is detected by the outflow pressure detector 34 and is used for controlling the outflow control valve 30 by the outflow / outflow control device 43. Similarly, the inflow rate of water or steam is detected by an inflow rate detector 40, and the inflow pressure of water or steam is detected by an inflow pressure detector 41 and used to control an inflow control valve 38 in an outflow / outflow control device 43. Is done.

FIG. 17 is a block diagram of an outflow / inflow control device 43 according to a fourteenth embodiment of the present invention.
In the outflow / inflow control device 43 of FIG. 17A, the relationship between the output of the gas turbine 12 and the inflow flow rate is set in advance in the function generator 94 in order to cooperate inflow control and outflow control that are closely related. Then, the outflow flow rate set value Qr is output using the output of the gas turbine or the output command value S as an input. The relationship between the flow rate and the opening of the outflow control valve 30 is set in the function generator 53 in advance, the outflow flow rate setting value Qr is input, and the opening degree corresponding to the outflow flow rate setting value Qr is output. Output is performed to the outflow control valve 30. As a result, the outflow control valve 30 has an opening degree corresponding to the gas turbine 12, and the inflow flow rate can be set to a flow rate corresponding to the output of the gas turbine 12.

In the gasification equipment flow model 96, a model simulating the control system of the inflow control valve 38 and the delay of the inflow from the gasification equipment 1 with respect to the output change of the gas turbine 12 is set. The delay can be represented by a dead time, a first-order delay, or the like. The outflow flow rate setting value Qr is input to the gasification equipment flow rate model 96, and the inflow flow rate setting value Rr in consideration of the outflow control and the delay of the gasification equipment is output.
The relationship between the flow rate and the opening of the inflow control valve 38 is set in the function generator 70 in advance, and an inflow flow rate set value Rr in consideration of the outflow control and the delay of the gasification equipment is input, and the inflow control corresponding to this is input. The opening degree of the valve 38 is controlled and output to the inflow control valve 38.

Thus, the inflow control valve 38 is set to an opening corresponding to the inflow flow rate set value Rr in consideration of the outflow control and the delay of the gasification equipment, and the inflow flow rate is controlled by the outflow control and gasification according to the output of the gas turbine 12. It is possible to set the flow rate in consideration of the delay of the facility 1.

In the outflow / inflow control device 43 shown in FIG. 17B, the outflow flow rate signal from the outflow flow rate detector 33 and the outflow flow rate set value Qr are input to a subtractor 54 to obtain a deviation.
In the arithmetic unit 55, the outflow control valve 30 is controlled so as to eliminate this deviation.
An operation signal is output to. In addition, the inflow rate detector 4
The inflow rate signal from 0 and the inflow rate set value Rr in consideration of the outflow control and the delay of the gasification equipment are input to a subtractor 98 to obtain a deviation. The PI calculator 99 controls the inflow control valve 38 to eliminate this deviation. An operation signal is output to.

As described above, the outflow control valve 30 can be controlled at a flow rate corresponding to the gas turbine output, and the inflow control valve 38 can be controlled at a flow rate corresponding to the gas turbine output, and the outflow control and gasification equipment 1 can be controlled. It is possible to control the flow rate in consideration of the delay.

In the outflow / inflow control device 43 shown in FIG. 17C, the relationship between the output of the gas turbine 12 and the outflow pressure is preset in the function generator 100, and the output of the gas turbine or the output command value S is input. Then, an outflow pressure set value Pr corresponding to the output of the gas turbine 12 is output. Subtractor 5
In step 4, the outflow pressure signal from the outflow pressure detector 34 and the outflow pressure set value Pr are input, and the deviation is obtained. The PI calculator 55 outputs an operation signal to the outflow control valve 30 so as to eliminate the deviation.

The gasification facility pressure model 102 includes:
A model simulating the outflow pressure control and the delay of the gasification facility 1 with respect to the output change of the gas turbine 12 is set,
This model is expressed by a dead time, a first-order delay, and the like. Set the outflow pressure Pr to the gasification equipment pressure model 102
And outputs the inflow pressure set value Jr in consideration of the outflow control and the delay of the gasification facility. The subtractor 98 calculates the deviation of the outflow pressure signal Jr from the inflow pressure detector 41 and the inflow pressure set value Jr in consideration of the outflow control and the delay of the gasification facility.
The I calculator 99 outputs an operation signal to the inflow control valve 38 so that the deviation is eliminated.

As described above, the outflow control valve 30 is controlled at the outflow pressure corresponding to the output of the gas turbine 12, and the inflow is controlled at the inflow pressure in the same manner according to the output of the gas turbine 12 and the outflow control and the gasification equipment 1. The control valve 38 can be controlled.

As described above, according to the fourteenth embodiment, coordinated inflow control and outflow control according to the output of the gas turbine 12 can be simultaneously performed.
The plant can be operated at a more ideal operating point.

Next, a fifteenth embodiment of the present invention will be described. FIG. 18 is a configuration diagram of a multi-line integrated gasification combined cycle power plant according to the fifteenth embodiment of the present invention. This first
The fifth embodiment is different from the third embodiment shown in FIG. 3 in that the outflow header control valve 44 and the outflow header pressure detector 4 are used.
5. The outflow header control device 46 is additionally provided. Then, the outflow header control valve 44 is controlled by the pressure on the secondary side of the outflow header control valve 44 to adjust the flow rate of the supply water supplied from the gas turbine equipment 8 to the gasification equipment.

In FIG. 18, the outflow header 28 has an outflow header control valve 44 for controlling the pressure flowing out of the gas turbine 12 to the gasification facility 1, and an outflow header pressure for detecting the pressure of the outflow header 28. A detector 45 and an outflow header controller 46 for controlling the outflow header control valve 44 are provided.

FIG. 19 is a block diagram of the outflow header control device 46. The outflow header control unit 46 controls the outflow header control valve 44 based on the outflow knitting pressure detected by the outflow header pressure detector 45.

Signal generator 10 of outflow header controller 46
4, the pressure set value of the outflow header 28 is set in advance, and the pressure set value signal Pa is output from the signal generator 104.
Is output. In the subtractor 54, the outflow header pressure detector 45
From the pressure signal and the pressure set value signal Pa,
The PI calculator 55 outputs an operation output to the outflow header control valve 44 so as to eliminate the deviation.

As described above, the outflow header control valve 44 can control the pressure of the outflow header 28 to be equal to the control set value. Even if the output of each gas turbine 12 becomes unbalanced, if the pressure of the outflow header 28 is properly controlled, the flow rate from each gas turbine facility 8 is properly secured, and the gas turbine facility 8 The flow discharged to the river is secured as planned.

As described above, according to the fifteenth embodiment, there is no need to install a control valve and a control device on each gas turbine equipment 8 side, and each gas turbine 12 Even if the output imbalance occurs, the plant can be operated at a predetermined most efficient operating point.

[0156]

As described above, the present invention makes it possible to perform optimal outflow control and inflow control at all operating points, and also to control the water supply control valve 22 of the exhaust heat recovery boiler 14. This has the effect that control without disturbance can be realized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a multi-line integrated gasification combined cycle power plant according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a multi-line combined gasification combined cycle power plant according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a multi-line combined gasification power generation system according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a multi-line combined gasification power generation system according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram of an outflow control device according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram of an outflow control device according to a fifth embodiment of the present invention.

FIG. 7 is a block diagram of an outflow control device according to a sixth embodiment of the present invention.

FIG. 8 is a block diagram of an outflow control device according to a seventh embodiment of the present invention.

FIG. 9 is a configuration diagram of a multi-line combined gasification power generation system according to an eighth embodiment of the present invention.

FIG. 10 is a block diagram of an inflow control device according to an eighth embodiment of the present invention.

FIG. 11 is a block diagram of an inflow control device according to a ninth embodiment of the present invention.

FIG. 12 is a block diagram of an inflow control device according to a tenth embodiment of the present invention.

FIG. 13 is a block diagram of an inflow control device according to an eleventh embodiment of the present invention.

FIG. 14 is a block diagram of an inflow control device according to a twelfth embodiment of the present invention.

FIG. 15 is a block diagram of an inflow control device according to a thirteenth embodiment of the present invention.

FIG. 16 is a configuration diagram of a multi-line combined gasification combined cycle facility according to a fourteenth embodiment of the present invention.

FIG. 17 is a block diagram of an inflow control device according to a fourteenth embodiment of the present invention.

FIG. 18 is a configuration diagram of a multi-line combined gasification combined cycle facility according to a fifteenth embodiment of the present invention.

FIG. 19 is a block diagram of an inflow control device according to a fourteenth embodiment of the present invention.

FIG. 20 is a configuration diagram showing an example of a conventional combined gasification power generation facility when there is one gasification facility and one combined cycle system.

FIG. 21 is a configuration diagram showing an example of a conventional combined gasification power generation facility in a case where there are three gasification facilities and three gas turbine facilities.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gasification equipment 2 Gasification furnace 6 Gas cooler 7 Desulfurization device 8 Gas turbine equipment 9 Fuel flow control valve 13 Gas turbine generator 14 Exhaust heat recovery boiler 19 Steam drum 20 Steam turbine equipment 23 Steam turbine generator 25 Feedwater pump 26 Water supply control Valve 27 Drum Level Detector 28 Outflow Header 29 Inflow Header 30 Outflow Control Valve 32 Outflow Control Device 33 Outflow Flow Detector 34 Outflow Pressure Detector 38 Inflow Control Valve 39 Inflow Control Device 40 Inflow Flow Detector 41 Inflow Pressure Detector 42 Steam Flow detector 43 Outflow / inflow control device 44 Outflow header control valve 45 Outflow header pressure detector 46 Outflow header control device

Claims (15)

[Claims] 1. A gasification facility comprising at least one gasification facility, at least two gas turbine facilities, and at least one steam turbine facility, wherein water is supplied from the gas turbine facility to the gasification facility, In a multi-series integrated gasification combined cycle power plant that supplies water or steam from the gasification facility to the gas turbine facility, water supplied from the gas turbine facility to the gasification facility is supplied at an outlet of each gas turbine facility. A multi-line combined gasification combined cycle facility, which is combined and supplied to the gasification facility. 2. A gas supply system comprising two or more gasification facilities, one or more gas turbine facilities, and one or more steam turbine facilities, wherein water is supplied from the gas turbine facilities to the gasification facility, In a multi-line combined gasification combined cycle power plant configured to supply water or steam from the gasification facility to the gas turbine facility, water or steam supplied from the gasification facility to the gas turbine facility is supplied to the gasification facility. A multi-line combined gasification combined cycle facility, which is combined at an outlet and supplied to the gas turbine facility. 3. A gas supply system comprising two or more gasification facilities, two or more gas turbine facilities, and one or more steam turbine facilities, wherein water is supplied from the gas turbine facilities to the gasification facility. A multi-line combined gasification power generation facility configured to supply water or steam from the gasification facility to the gas turbine facility, wherein water supplied from the gas turbine facility to the gasification facility is supplied to an outlet of the gas turbine facility. And supplying to the gasification equipment, water or steam supplied from the gasification equipment to the gas turbine equipment at an outlet of the gasification equipment and supplying to the gas turbine equipment. Gasification combined cycle power plant. 4. An outflow control valve is installed at an outlet of each gas turbine facility of a system for supplying water from the gas turbine facility to the gasification facility, and the flow control valve is provided at a flow rate corresponding to an output of the gas turbine or an output command value. 4. An outflow control device for controlling an outflow control valve is provided.
The multi-line integrated gasification combined cycle power plant according to any one of the above. 5. The outflow control device according to claim 1, wherein at least one of atmospheric temperature, atmospheric humidity, and atmospheric pressure is used to correct a gas turbine output or a flow rate according to an output command value. Item 5. A multi-line integrated gasification combined cycle facility according to Item 4. 6. The outflow control device uses at least one of an exhaust gas flow rate of the gas turbine, an exhaust gas temperature, and a drum pressure of an exhaust heat recovery boiler, instead of an output of the gas turbine or an output command value, The multi-stream integrated gasification combined cycle facility according to claim 4, wherein the flow rate is calculated. 7. The outflow control device includes at least one of a load command value of the gasification facility, a gasification fuel flow rate, a purified gas flow rate, a gasification fuel control valve opening, and a gasification fuel control valve command value. The combined gasification and power generation system according to claim 4, wherein the above is used to correct the output of the gas turbine or the flow rate according to the output command value. 8. An inflow control valve is installed at an inlet of each gas turbine equipment of a system for supplying water or steam from the gasification equipment to the gas turbine equipment, and a flow rate according to an output of the gas turbine or an output command value. The multi-gasification combined cycle power generation equipment according to any one of claims 1 to 3, further comprising an inflow control device that controls the inflow control valve by pressure. 9. The inflow control device according to claim 1, wherein at least one of an atmospheric temperature, an atmospheric humidity, and an atmospheric pressure is used to correct a flow rate or a pressure according to an output of the gas turbine or an output command value. The multi-line combined gasification power generation system according to claim 8, wherein 10. The inflow control device according to claim 1, wherein at least one of an exhaust gas flow rate of the gas turbine, an exhaust gas temperature, and a drum pressure of an exhaust heat recovery boiler is used instead of an output or an output command value of the gas turbine. The multi-stream combined gasification combined cycle system according to claim 8, wherein the flow rate or the pressure is calculated. 11. The inflow control device includes at least one of a load command value of the gasification facility, a gasification fuel flow rate, a purified gas flow rate, an opening of a gasification fuel control valve, and a command value of the gasification fuel control valve. The multi-line combined gasification combined cycle system according to claim 8, wherein the flow rate according to the output of the gas turbine or the output command value is corrected using the above. 12. The inflow control device uses a steam flow rate generated from the steam drum of the exhaust heat recovery boiler,
9. The multi-line combined gasification power generation system according to claim 8, wherein a flow rate or a pressure corresponding to an output of the gas turbine or an output command value is limited. 13. The combined gasification combined cycle power plant according to claim 8, wherein the inflow control device has therein a model simulating dynamic characteristics of water supplied from the gasification plant. 14. An outflow control valve is installed at an outlet of each gas turbine equipment of a system for supplying water from the gas turbine equipment to the gasification equipment, and water or steam is supplied from the gasification equipment to the gas turbine equipment. An inflow control valve is installed at the inlet of each gas turbine facility of the supply system, and an outflow / inflow control device that controls the outflow control valve or the inflow control valve at a flow rate or pressure according to the output of the gas turbine is provided. 4. The method according to claim 1, wherein:
Multi-line gasification combined cycle power plant as described in the item. 15. An outflow header control valve is installed after a system for supplying water from a gas turbine facility to a gasification facility is installed, and the outflow header control valve is controlled by a pressure on a secondary side of the outflow header control valve. The multi-line combined gasification combined cycle power plant according to any one of claims 1 to 3, further comprising an outflow header control device.