JP3952236B2 - Fossil fuel gasification power plant and method for preheating the equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fossil fuel gasification power plant which eliminates a gas circulating compressor necessary only at the time of starting and increases the efficiency in aspects of equipment investment and energy consumption. SOLUTION: A fossil fuel gasification power plant comprises fossil gasification apparatus 7, 8, 9 and 10, oxygen production apparatus 3, 4, 5 and 6 which produce oxygen and nitrogen from air and feed the oxygen to said gasification apparatus, desulfurizing apparatus 11, 13 and 15 which remove sulfur compounds from a fossil fuel gas, and apparatus 17, 18, 19 and 20 for generating electricity by consuming the desulfurized fossil fuel gas, and annexed apparatus such as a filter 10 and a carbonyl sulfide transformer 13 which require preheating before passing the gasified fossil fuel gas to at least one of the gasification apparatus and the desulfurization apparatus, said apparatus 10 and 13 which require preheating being supplied with excess nitrogen 107 via a heater by utilizing the pressure of the high pressure excess nitrogen 107 to be produced in the oxygen production apparatus 3, 4, 5 and 6 and heated.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fossil fuel gasification power plant that generates power by gasifying fossil fuels such as coal and heavy oil, and in particular, a configuration of a fossil fuel gasification power plant before passing the gasified fossil fuel as a gas. The present invention relates to a preheating method for preheating equipment.
[0002]
[Prior art]
FIG. 3 is a system diagram showing an example of the configuration of a coal gasification combined power plant that is a kind of conventional fossil fuel gasification power plant. In this coal gasification combined power plant, the pulverized coal 101 is supplied to the gasification furnace 7 by nitrogen 102 and oxygen 103 is supplied to the gasification furnace 7. From the gasification furnace 7, the main component is hydrogen or carbon monoxide, solid matter consisting of ash and dust, unreacted carbon, that is, char 108, and a sulfur compound such as carbonyl sulfide and hydrogen sulfide is 1000 ° C. or higher. The flammable product gas 105 is obtained. The combustible product gas 105 is cooled to about 400 ° C. by the heat recovery boiler 8, the char 108 is removed by the cyclone 9 and the filter 10, and is cooled to about 350 ° C. by the gas / gas heat exchanger 21.
[0003]
The recovered char 108 is re-supplied to the gasifier 7 in order to react unreacted carbon and melt the ash into slag 106. In the washing tower 11, fine soot that has passed through the cyclone 9 and the filter 10 is washed and removed. The combustible product gas 105 is cooled to about 120 ° C. in the water washing process.
[0004]
A carbonyl sulfide converter 13 is used to convert carbonyl sulfide in the combustible product gas 105 to hydrogen sulfide. Since the catalyst of the carbonyl sulfide converter 13 operates in a temperature range of 160 ° C. to 250 ° C., the combustible product gas 105 is converted into the above operating temperature by the gas / gas heat exchanger 22 and the gas heating heat exchanger 23. Until heated.
[0005]
The combustible product gas 105 leaving the carbonyl sulfide converter 13 is cooled to about 40 ° C. by the gas / gas heat exchanger 22 and the gas cooling heat exchanger 24. The condensed water generated in this cooling process is removed by the condensed water remover 14. Hydrogen sulfide in the gas is removed by the hydrogen sulfide absorption tower 15. The hydrogen sulfide absorbing liquid 113 operates at about 40 ° C.
The gas from which the sulfur compound has been removed, that is, the refined gas 118, is heated to about 130 ° C. by the gas heating heat exchanger 25 and further heated by the gas / gas heat exchanger 21 to form a gas turbine fuel gas 118a. The gas turbine 19 is supplied to the turbine combustor 17 to generate electric power.
[0006]
The product gas 105 generated in the gasification furnace contains moisture, and its dew point is around 100 ° C. If the heat transfer tube wall temperature of the gas / gas heat exchanger 21 is lower than the dew point, condensed water is generated on the tube wall, and fine soot may adhere to the tube wall and reduce heat transfer performance. Therefore, in order to prevent moisture in the product gas from condensing on the heat transfer tube wall, as described above, the purified gas is supplied to the gas heating heat exchanger 25 at the inlet of the gas / gas heat exchanger 21 by about 130. The temperature is raised to ° C.
[0007]
The above operation is a steady operation state of the coal gasification combined power plant of FIG. On the other hand, when the coal gasification combined power plant is stopped, all the devices are at room temperature, and when the gasification furnace 7 is started, high-temperature gas flows and flows into a heat exchanger for heating, a heat exchanger for cooling, etc. Necessary steam and cooling water are supplied, and downstream devices and equipment are heated to a steady temperature.
[0008]
At that time, as described above, since the gas generated in the gasification furnace contains moisture, condensed water is generated on the inner surface of the room temperature apparatus or device. This condensed water evaporates and disappears as it reaches a steady temperature, but there are devices in which temporary generation of condensed water leads to a decrease in performance. For example, since char 108 has accumulated on the filter element of the filter 10 from the beginning of the start-up, if condensed water is generated here, the filter may be clogged and may not function normally. Further, the carbonyl sulfide converter 13 is filled with a catalyst, and if condensed water adheres to the catalyst, the pores showing catalytic activity are blocked with condensed water, and the water in the pores is difficult to evaporate. The catalyst may not function normally. Therefore, these devices need to be preheated above the gas dew point before passing the gas from the gasifier.
[0009]
In FIG. 3, the state of the valve in which the opening is indicated by white and the closing is indicated by blackening is the initial state of activation. The outline of the start-up procedure of the coal gasification combined power plant shown in FIG. 3 is as follows.
(1) Start an oxygen production apparatus comprising an air separation tower 3, an air compressor 4, a nitrogen compressor 5, an oxygen compressor 6, and the like.
(2) Oxygen 103 and liquid fuel 104 such as light oil are supplied to the gasification furnace 6, and the gasification furnace 7 is heated to raise the temperature. The combustion gas 105a is guided to the water washing tower 11 via the heat recovery boiler 8, the cyclone 9, and the bypass line 105b. In the water washing tower 11, NOx and SOx in the combustion gas are removed and discharged as a combustion exhaust gas 110 from the system.
(3) Gas circulation compressor 26, gas heating heat exchanger 25, gas / gas heat exchanger 21, bypass line 114a, filter 10, gas / gas heat exchanger 21, bypass line 114b, gas / gas heat exchanger 22, a gas heating heat exchanger 23, a carbonyl sulfide converter 13, a gas / gas heat exchanger 22, a gas cooling heat exchanger 24, a condensed water remover 14, and a circulation line connecting the gas circulation compressor 26 with high pressure. Fill with nitrogen. The gas circulation compressor 26 is activated to circulate high pressure nitrogen, supply heating steam to the gas heating heat exchangers 25 and 23, supply cooling water to the gas cooling heat exchanger 24, and circulate nitrogen. To heat the filter 10 and the carbonyl sulfide converter 13 above the dew point.
(4) The desulfurization apparatus including the hydrogen sulfide absorption tower 15 is started.
(5) A device for generating power by consuming the gasified fossil fuel gas comprising the gas turbine combustor 17, the air compressor 18, the gas turbine 19, and the generator 20 is prepared to receive the gas turbine fuel gas 118a.
(6) The gas circulation compressor 26 is stopped, and the valves 207 and 208 in the line 114 are closed.
(7) The supply of the pulverized coal 101 to the gasification furnace 7 is started, and the supply of the liquid fuel 104 is stopped.
(8) The valves 201 to 206 for the main gas line are opened, and the valves 209 and 210 for the bypass line and the valve 211 for the combustion exhaust gas line are closed.
[0010]
[Problems to be solved by the invention]
In the conventional startup procedure, the nitrogen circulation heating procedure shown in (3) is required to prevent condensation of moisture in the filter 10 and the carbonyl sulfide converter 13. In order to circulate the nitrogen gas, a gas circulation compressor 26 is required.
[0011]
The gas circulation compressor 26 is not used during steady operation, and requires electric power to operate the gas circulation compressor before power generation is started.
[0012]
On the other hand, high-pressure nitrogen was excessive in the oxygen production apparatus.
[0013]
In the plant configuration described above, a compressor for gas circulation that is used only at the time of start-up is required, and the investment efficiency in terms of capital investment has been reduced. In addition, there is a problem that the power for operating the compressor for gas circulation is required at the time of starting, and the efficiency in terms of energy consumption is reduced.
[0014]
An object of the present invention is to provide means for preventing a reduction in efficiency in terms of capital investment and efficiency in terms of energy consumption caused by a compressor for gas circulation that is used only at startup in a fossil fuel gasification power plant. It is to provide a fossil fuel gasification power plant and a method for preheating the equipment.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a gasifier for gasifying fossil fuel, an oxygen generator for manufacturing oxygen and nitrogen by using air as a raw material and supplying oxygen to the gasifier, A fossil fuel comprising a desulfurization device that removes sulfur compounds from gasified fossil fuel gas and a device that generates electricity by consuming the desulfurized fossil fuel gas, and is gasified into at least one of the gasification device and the desulfurization device In a fossil fuel gasification power plant with equipment that requires preheating before passing gas, fossil fuel gasification power generation is provided with a high-pressure nitrogen supply line that supplies excess high-pressure nitrogen generated in the oxygen production equipment to equipment that requires preheating. Propose a plant.
[0016]
The equipment that requires preheating can include, for example, at least one of a filter that removes solids in the gasified fossil fuel gas and a catalyst-filled container that converts carbonyl sulfide into hydrogen sulfide.
[0017]
An apparatus for generating power by consuming gasified fossil fuel gas may be a gas turbine alone or a combination of a gas turbine and at least one of a fuel cell and a steam turbine.
[0018]
In order to achieve the above object, the present invention also provides a gasifier for gasifying fossil fuel, and an oxygen generator for supplying oxygen produced by producing oxygen and nitrogen using air as a raw material to the gasifier. And a desulfurization device that removes sulfur compounds from the gasified fossil fuel gas, and a device that generates electricity by consuming the desulfurized fossil fuel gas, and gasifies at least one of the gasification device and the desulfurization device. In the preheating method of the equipment of the fossil fuel gasification power plant where the equipment that needs to be preheated before passing the generated fossil fuel gas is passed through the heater using the high-pressure excess nitrogen pressure generated in the oxygen production apparatus A method of preheating fossil fuel gasification power plant equipment that supplies and heats excess nitrogen to the equipment requiring preheating is proposed.
[0019]
In the present invention, a gasification device that gasifies fossil fuel, an oxygen production device that produces oxygen and nitrogen using air as a raw material, and supplies the gasification device with oxygen, and a gasified fossil fuel gas A desulfurization device that removes sulfur compounds from the gas and a device that generates electricity by consuming the desulfurized fossil fuel gas, and preheating the gasified fossil fuel gas before passing it through at least one of the gasification device and the desulfurization device. In a fossil fuel gasification power plant with the necessary equipment attached, the excess nitrogen is supplied to the equipment requiring preheating and heated through a heater using the pressure of the high pressure excess nitrogen generated in the oxygen production apparatus. This eliminates the need for a gas circulation compressor that is used only at the time of startup, which has been installed in the past, and improves the efficiency in terms of capital investment and energy consumption.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, with reference to FIG. 1 and FIG. 2, the Example of the preheating method of the fossil fuel gasification power plant and its apparatus by this invention is described.
[0021]
Example 1
FIG. 1 is a system diagram showing the configuration of an embodiment of a fossil fuel gasification power plant according to the present invention. The plant is roughly divided into a coal processing device, an oxygen production device, a gasification device, a desulfurization device, and a device that generates electricity by consuming gasified fossil fuel gas, that is, coal gas.
[0022]
The coal processing apparatus includes a pulverizer 1 and a coal supply hopper 2. The coal 100 is pulverized by the pulverizer 1 to become pulverized coal having an average particle diameter of 40 μm and is filled in the coal supply hopper 2.
[0023]
The oxygen production apparatus includes an air separation tower 3, an air compressor 4, a nitrogen compressor 5, and an oxygen compressor 6. During steady operation, compressed air 115a from the air compressor 18 connected to the gas turbine 19 is supplied to the air separation tower 3 and separated into nitrogen 102 and oxygen 103 by a cryogenic separation method. Nitrogen 102 is pressurized by the nitrogen compressor 5, and oxygen 103 is pressurized by the oxygen compressor 6. Nitrogen 102 conveys the pulverized coal 101 to the gasification furnace 7 and is used for purging each device and cooling the blades of the gas turbine 19. The oxygen 103 is supplied to the gasification furnace 7.
[0024]
The gasifier includes a gasification furnace 7, a heat recovery boiler 8, a cyclone 9, and a filter 10. The gasification furnace 7 is supplied with pulverized coal 101 and oxygen 103 as an oxidizer, and a gasification reaction of the coal occurs to generate a combustible refined gas 105 mainly composed of hydrogen or carbon monoxide. To do. Since the gasification furnace 7 has a high temperature of about 1600 ° C., the ash contained in the coal by several percent to several tens of percent is melted, taken out from the lower part of the gasification furnace 7, and water-cooled and pulverized. The slag 106 is obtained. Since the purified gas 105 has a high temperature of about 1000 ° C., it is cooled to about 400 ° C. by the waste heat recovery boiler 8. Since the produced gas 105 is accompanied by solid matter containing char, which is not removed as slag 106, ash, dust, and unreacted carbon, that is, char 108, cyclone 9 which is a dry dedusting device attached to the gasifier, It is removed by the filter 10. The recovered char 108 is re-supplied to the gasification furnace 7, and the ash is melted to form the slag 106, and the unreacted carbon is reacted.
[0025]
The desulfurization apparatus includes a water washing tower 11, a carbonyl sulfide converter 13, a hydrogen sulfide absorption tower 15, and heat exchangers. The gas after dust collection contains fine solids that could not be removed by the dry dedusting device, and carbonyl sulfide and hydrogen sulfide generated from the sulfur contained in the coal. Fine solids cause clogging and wear in downstream equipment, and sulfur compounds cause the generation of harmful gases called sulfur oxides when the gas is burned. .
The generated gas after dedusting is cooled to 300 to 350 ° C. by the gas / gas heat exchanger 21, and the fine dust that has passed through the cyclone 9 and the filter 10 is washed and removed by the washing tower 11. In this washing process, the product gas is cooled to about 120 ° C. The carbonyl sulfide in the product gas is converted into hydrogen sulfide by the carbonyl sulfide converter 13. The carbonyl sulfide converter 13 is a reaction vessel filled with a catalyst that reacts carbonyl sulfide with moisture in the gas to convert it into hydrogen sulfide. Since this catalyst operates in a temperature range of 160 ° C. to 250 ° C., the generated gas is heated to the above operating temperature by the gas / gas heat exchanger 22 and the gas heating heat exchanger 23. Hydrogen sulfide in the gas is removed by the hydrogen sulfide absorption tower 15. The hydrogen sulfide absorbing liquid 113 operates at about 40 ° C. For this reason, the product gas leaving the carbonyl sulfide converter 13 is cooled to about 40 ° C. by the gas / gas heat exchanger 22 and the gas cooling heat exchanger 24. The condensed water generated in this cooling process is removed by the condensed water remover 14. The purified gas 118 from which the sulfur compound has been removed is heated by the gas heating heat exchanger 25 and the gas / gas heat exchanger 21 and supplied to the gas turbine combustor 17 as a gas turbine fuel gas 118a. Drive and generate electricity.
[0026]
The product gas 105 generated in the gasification furnace contains moisture, and its dew point is around 100 ° C. In the gas / gas heat exchanger 21, the high-temperature product gas and the low-temperature purified gas are indirectly contacted via a heat transfer tube, and the purified gas 118 is heated. At this time, if the temperature of the heat transfer tube wall with which the product gas 105 is in contact is lower than the dew point, condensed water is generated on the tube wall, and fine dust may adhere to the tube wall and reduce heat transfer performance. For this reason, the purified gas is heated to about 130 ° C. by the gas heating heat exchanger 25 at the inlet of the gas / gas heat exchanger 21 to prevent moisture in the generated gas from condensing on the heat transfer tube wall. To do.
[0027]
An apparatus for generating power by consuming gasified coal gas includes a gas turbine combustor 17, an air compressor 18, a gas turbine 19, and a generator 20. The gas turbine fuel gas 118 a is burned in the gas turbine combustor 17, drives the gas turbine 19, and generates power by the generator 20. Further, the air compressor 18 is driven to supply the raw material air 115a of the oxygen production apparatus. Although the exhaust gas 116 is finally discharged out of the system, a steam turbine power generation device including a waste heat recovery boiler, a steam turbine, and a generator for using the heat of the exhaust gas 116 may be installed.
[0028]
The above operation is a steady operation state of the fossil fuel gasification power plant of the present invention. On the other hand, when the power plant is stopped, all the devices are at room temperature, and at the time of start-up, the gasification furnace is started, high-temperature gas flows, a heat exchanger for heating, a heat exchanger for cooling, etc. Necessary steam and cooling water are supplied, and downstream devices and equipment are heated to a steady temperature.
[0029]
As already described, since the product gas 105 generated in the gasification furnace 7 contains moisture, condensed water is generated when the product gas 105 comes into contact with the inner surface of a room temperature apparatus or device during the startup process. This condensed water evaporates and disappears as it reaches a steady temperature, but in the filter 10 and the carbonyl sulfide converter 13, temporary generation of condensed water may lead to a decrease in performance. Since char has accumulated in the filter element of the filter 10 from the beginning of activation, if condensed water is generated here, the filter may be clogged and may not function normally. The carbonyl sulfide converter 13 is filled with a catalyst, and when condensed water adheres to the catalyst, pores showing catalytic activity are blocked with condensed water, and moisture in the pores hardly evaporates. May not work properly. Therefore, these devices need to be preheated above the dew point of the gas before passing the product gas from the gasifier.
[0030]
The state of the valve shown in FIG. 1 with the white open and the closed with black indicates the preheating process of these devices. The starting procedure in the present invention is roughly as follows.
(1) A coal processing apparatus including a pulverizer 1 and a coal supply hopper 2 is started, and the pulverized coal is charged into the coal supply hopper 2.
(2) The oxygen production apparatus including the air separation tower 3, the air compressor 4, the nitrogen compressor 5, the oxygen compressor 6 and the like is started. Since the air compressor 18 connected to the gas turbine 19 has not been started yet, the raw air 117 is supplied from the air compressor 4.
(3) Supplying oxygen 103 and liquid fuel 104 such as light oil to the gasifier 7, the gasifier is heated, and the temperature is raised. The combustion gas 105a is guided to the water washing tower 11 via the heat recovery boiler 8, the cyclone 9, and the bypass line 105b. In the water washing tower 11, NOx and SOx in the combustion gas are removed and released as combustion exhaust gas 110 to the outside of the system.
(4) The filter 10 and the carbonyl sulfide converter 13 are preheated by supplying high-pressure surplus nitrogen 107 generated in the oxygen production apparatus. The high-pressure nitrogen 107 is heated by the gas heating heat exchanger 25, passes through the gas / gas heat exchanger 21 and the bypass line 114 a, reaches the filter 10, and heats the filter 10. Further, the high-pressure nitrogen 107 reaches the gas heating heat exchanger 23 via the gas / gas heat exchanger 21, the bypass line 114 b, and the gas / gas heat exchanger 22, and is heated by the gas heating heat exchanger 23. Then, the carbonyl sulfide converter 13 is reached and the carbonyl sulfide converter 13 is heated. After passing through the carbonyl sulfide converter 13, it is discharged out of the system as exhausted nitrogen gas 112 through the gas / gas heat exchanger 22, the gas cooling heat exchanger 24, and the condensed water remover 14. The supply of high pressure nitrogen 107 is continued until the filter 10 and the carbonyl sulfide converter 13 are heated to a temperature above the dew point of the product gas 105. When the filter 10 and the carbonyl sulfide converter 13 reach a predetermined temperature, the valve 213 of the high-pressure nitrogen supply line and the valve 214 of the exhaust nitrogen gas line are closed, and the supply of the high-pressure nitrogen 107 is stopped.
(5) The desulfurization apparatus including the hydrogen sulfide absorption tower 15 is started.
(6) Preparation for accepting the gas turbine fuel gas 118a to a device that generates power by consuming the gasified fossil fuel gas comprising the gas turbine combustor 17, the air compressor 18, the gas turbine 19, and the generator 20 .
(7) The supply of the pulverized coal 101 to the gasification furnace 7 is started, and the supply of the liquid fuel 104 is stopped.
(8) The main gas line valves 201, 202, 203, 204, 205 and 206 are opened, and the bypass line valves 209 and 210 and the combustion exhaust gas line valve 211 are closed.
[0031]
In the present invention, in order to prevent moisture condensation in the filter 10 and the carbonyl sulfide converter 13, as shown in the procedure (4), high-pressure surplus nitrogen generated in the oxygen production apparatus is supplied, Heat. Therefore, the conventional compressor for circulating the nitrogen gas shown in FIG. 3 is not required, and the efficiency in terms of capital investment and energy consumption at startup is improved.
[0032]
Example 2
Next, another embodiment according to the present invention will be described with reference to FIG. FIG. 2 is a system diagram showing the configuration of another part of another embodiment of the fossil fuel gasification power plant according to the present invention which is different from the embodiment of FIG. The apparatus part that consumes the coal gasification gas and generates power in the embodiment 1 of FIG. 1 may be replaced with the power generation apparatus of FIG.
[0033]
2 includes a fuel cell 27, a gas turbine combustor 17, an air compressor 18, a gas turbine 19, a generator 20, an exhaust heat recovery boiler 28, a steam turbine 29, and a generator 20a. It consists of. The gas turbine fuel gas 118 a is burned in the gas turbine combustor 17, drives the gas turbine 19, and generates power by the generator 20. At this time, a part of the gas turbine fuel gas 118 a is branched and used for fuel cell power generation via the fuel cell 27. The heat of the exhaust gas 116 of the gas turbine 19 is transmitted to the steam 119 by the exhaust heat recovery boiler 28. The steam 119 drives the steam turbine 29 and generates power with the generator 20a. The exhaust gas 116 is discharged from the chimney 30.
[0034]
In the second embodiment, the system configuration in which the fuel cell 27 and the steam turbine 29 are provided is shown, but only one of them may be installed.
[0035]
【The invention's effect】
According to the present invention, a gasification device that gasifies fossil fuel, an oxygen production device that produces and produces oxygen and nitrogen using air as a raw material, and the gasification device, and a gasified fossil fuel It consists of a desulfurization device that removes sulfur compounds from the gas and a device that generates electricity by consuming the desulfurized fossil fuel gas, and preheats before passing the gasified fossil fuel gas through at least one of the gasification device and the desulfurization device. In a fossil fuel gasification power plant with equipment that requires heat, supply the excess nitrogen to the equipment that requires preheating via a heater using the pressure of the high-pressure surplus nitrogen generated in the oxygen production apparatus. This eliminates the need for a gas circulation compressor that is used only at the time of startup, which has been conventionally installed, and improves the efficiency in terms of capital investment and energy consumption.
[Brief description of the drawings]
FIG. 1 is a system diagram showing the configuration of an embodiment of a fossil fuel gasification power plant according to the present invention.
FIG. 2 is a system diagram showing a configuration of a part of another embodiment of the fossil fuel gasification power plant according to the present invention different from the embodiment of FIG.
FIG. 3 is a system diagram showing a configuration of an example of a conventional coal gasification combined power plant.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crusher 2 Coal supply hopper 3 Air separation tower 4 Air compressor 5 Nitrogen compressor 6 Oxygen compressor 7 Gasifier 8 Heat recovery boiler 9 Cyclone 10 Filter 11 Washing tower 12 Circulating water pump 13 Carbonyl sulfide converter 14 Condensed water Remover 15 Hydrogen sulfide absorption tower 16 Absorbing liquid circulation pump 17 Gas turbine combustor 18 Air compressor 19 Gas turbine 20 Generator 21 Gas / gas heat exchanger 22 Gas / gas heat exchanger 23 Gas heating heat exchanger 24 Gas Heat exchanger 25 for cooling Heat exchanger 26 for gas heating Compressor 27 for gas circulation Fuel cell 28 Waste heat recovery boiler 29 Steam turbine 30 Chimney 100 Coal 101 Coal crushed 102 Nitrogen 103 Oxygen 104 Liquid fuel 105 Product gas 105a Combustion Gas 105b Bypass line 106 Slag 107 High pressure nitrogen 108 Char 109 Circulating water 1 0 flue gas 111 condensed water 112 exhaust nitrogen gas 113 hydrogen sulfide absorbent solution 114 circulating high pressure nitrogen 114a bypass line 114b bypass line 115 air 115a air 116 gas 117 air 118 purified gas 118a gas turbine fuel gas 119 vapors 201-214 Valve

Claims (2)

A gasification device that gasifies fossil fuel, an oxygen production device that produces oxygen and nitrogen using air as a raw material, supplies oxygen to the gasification device, and removes sulfur compounds from the gasified fossil fuel gas And a device that consumes the desulfurized fossil fuel gas and generates power, and an apparatus that requires preheating before passing the gasified fossil fuel gas through at least one of the gasifier and the desulfurizer. In the attached fossil fuel gasification power plant,
A fossil fuel gasification power plant, comprising a high-pressure nitrogen supply line for supplying excess high-pressure nitrogen generated in the oxygen production apparatus to the equipment requiring preheating. A gasification device that gasifies fossil fuel, an oxygen production device that produces oxygen and nitrogen using air as a raw material, supplies oxygen to the gasification device, and removes sulfur compounds from the gasified fossil fuel gas And a device that consumes the desulfurized fossil fuel gas and generates power, and an apparatus that requires preheating before passing the gasified fossil fuel gas through at least one of the gasifier and the desulfurizer. In the preheating method of the equipment of the attached fossil fuel gasification power plant,
Equipment for a fossil fuel gasification power plant , which uses the pressure of high-pressure excess nitrogen generated in the oxygen production apparatus to supply the excess nitrogen to the equipment requiring preheating through a heater and heats the equipment. Preheating method .

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