CN109361000A - Integral coal gasification solid oxide fuel cell-steam turbine combined generating system and technique - Google Patents
Integral coal gasification solid oxide fuel cell-steam turbine combined generating system and technique Download PDFInfo
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- CN109361000A CN109361000A CN201811024417.6A CN201811024417A CN109361000A CN 109361000 A CN109361000 A CN 109361000A CN 201811024417 A CN201811024417 A CN 201811024417A CN 109361000 A CN109361000 A CN 109361000A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04014—Heat exchange using gaseous fluids; Heat exchange by combustion of reactants
- H01M8/04022—Heating by combustion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04029—Heat exchange using liquids
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0606—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants
- H01M8/0612—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants from carbon-containing material
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Abstract
The present invention provides a kind of integral coal gasification solid oxide fuel cell-steam turbine combined generating system and technique, the system includes the air separation unit connected by pipeline, gasification furnace, purified synthesis gas device, solid oxide fuel cell, gas-liquid separator, steam boiler, steam turbine, generator and heat exchanger, the system uses coal to react the synthesis gas of preparation with oxygen for raw material, using solid oxide fuel cell and steam turbine cogeneration, a certain amount of hot water is exported simultaneously, solve the corrosion and leakage problem of molten carbonate fuel cell electrolyte, it reduces investment outlay simultaneously, it is energy saving, the thermal efficiency of raising system.
Description
Technical field
The invention belongs to solid oxide fuel cell technical field more particularly to a kind of integral coal gasification soild oxides
Fuel cell-steam turbine combined generating system and technique.
Background technique
Fuel cell technology for power generation is a kind of power generator for directly converting the chemical energy of fuel to electric energy, according to fuel
Battery operating temperature is divided into high-temperature fuel cell and low-temperature fuel cell, and wherein high-temperature fuel cell includes soild oxide combustion
Expect battery and molten carbonate fuel cell, low-temperature fuel cell include Proton Exchange Membrane Fuel Cells etc..With traditional coal-fired hair
Power technology is different, and fuel cell is the chemical energy in fuel to be converted into electric energy, in the process without heat using electrochemical catalysis
Mechanics circulation, is not limited by heat engine Carnot's cycle efficiency, thus generating efficiency is higher.High-temperature fuel cell is combined with steam turbine
Fuel cell tail gas is also carried out burning generation steam and then pushes steam by generation technology other than using fuel cell power generation
Turbine acting power generation, the technology can be further improved generating efficiency and energy utilization rate.Fuel cell power generation efficiency is about at present
45~65%, fuel cell-steam turbine cogeneration efficiency about 55~75%, considerably beyond conventional coal-burning power plant, (35% is left
It is right) and advanced Gas-steam Combined Cycle (45% or so) generating efficiency, fuel cell technology is cleaned in coal at present
The great attention of industrially developed country has been obtained using the application in field.
Integral coal gasification fuel cell (Integrated Gasification Fuel Cell, IGFC) electricity generation system is
The advanced generation technology of a new generation that Coal Gasification Technology is combined with fuel cell technology for power generation, electricity generation system is by three parts system
System is constituted, i.e. gasification system, gas cleaning system and fuel cell generation.IGFC electricity generation system efficiently, cleaning,
Waste utilization, Poly-generation and it is water-saving the features such as organically combine, not only improve generating efficiency, but also solve environmental pollution
Problem, it is considered to be 21 century most promising Coal Clean generation technology.IGFC is combined into reality with steam turbine
Existing cogeneration can be further improved generating efficiency and energy utilization rate.
Patent CN201410608387.9 discloses a kind of integral coal gasification melting carbonate fuel cell generation system, should
System is combined using Coal Gasification Technology with molten carbonate fuel cell power generation and air turbine power generation, and generating efficiency is reachable
50% or more.Melt carbonate fuel battery (Molten Carbonate Fuel Cell, abbreviation MCFC), operating temperature 600
~700 DEG C, electrolyte is molten state Li2CO3And K2CO3Mixture, the management of liquid electrolyte is more difficult under hot conditions,
In During prolonged operation, electrolyte corrosion and leakage phenomenon are serious, reduce the service life of molten carbonate fuel cell.Root
According to molten carbonate fuel cell working principle, CO2It must cycle operation, the i.e. CO from anode discharge2H is removed with by catalysis2
Processing after, then mix with air feeding cathode, CO according to a certain percentage2Circulation increase molten carbonate fuel cell system
The complexity for the structure and control of uniting.And it is lower as the air turbine generating efficiency of working media using air, it is unfavorable for high-temperature fuel
The recycling of battery system heat.
Solid oxide fuel cell (Solid Oxide Fuel Cell, abbreviation SOFC) and a kind of high-temperature fuel electricity
Pond, operating temperature is at 700~1000 DEG C.Compared with molten carbonate fuel cell, solid oxide fuel cell has following
Feature: (1) material, using ceramic material as electrolyte, cathode and anode has structure of whole solid state, avoids electrolyte
Corrosion and leakage problem；(2), synthesis gas (the main component CO and H of coal gasification preparation2) can be not necessarily to directly as fuel
Carry out carbon monodixe conversion and carbon dioxide removal process；(3), operating temperature and delivery temperature are higher, have more waste heats for
It utilizes；(4), the permission of impurity is higher, is more suitable for combining application with Coal Gasification Technology.Therefore solid oxide fuel cell
And solid oxide fuel cell is generally considered to obtain extensively in future with steam turbine and gas turbine joint technology
Using.
Patent CN02111642.3 discloses a kind of using natural gas as the solid oxide fuel cell steam turbine of fuel
Combined generating system, patent CN201310269160.1 disclose a kind of using coke-stove gas as the solid oxide fuel of fuel electricity
Pond-steam turbine-BrLi chiller combines hot and cold, chp system, but natural gas and coke-stove gas do not meet China
The national conditions used coal as its main energy source.
Summary of the invention
In view of integral coal gasification fuel cell problem of the existing technology, the present invention provides a kind of integral coal gasification solid
Oxide fuel cell-steam turbine combined generating system, the synthesis gas which uses coal gasification to prepare is fuel, using solid
Oxide body fuel cell and steam turbine cogeneration can also export a certain amount of hot water in addition to power generation, realize thermoelectricity connection
It produces, which avoids the corrosion and leakage problem of molten carbonate fuel cell electrolyte, improves system thermal benefit
With rate.
A kind of integral coal gasification solid oxide fuel cell-steam turbine combined generating system of the invention, the system
Including by air oxygen and nitrogen separate air separation unit, coal and oxygen that coal gasification reaction occur to generate synthesis
The gasification furnace with oxygen intake and coal entrance of gas, purified synthesis gas device, the solid oxygen that purified treatment is carried out to synthesis gas
Compound fuel cell carries out the gas-liquid separator of gas-liquid separation to anode exhaust gas, anode exhaust gas is made to react production with cathode exhaust gas
Heat and preheated oxygen and generate the steam boiler of steam, steam turbine, generator and for first, second, the of heat exchange
Three and the 4th heat exchanger,
Wherein, the gas access of the air separation unit is connect with air inlet pipe, the oxygen output tube road of air separation unit
It is divided into two branch pipes, a branch pipe is connected to the oxygen intake of gasification furnace, and the synthesis gas output channel of gasification furnace is connected to first
The high-temperature gas outlet of the high-temperature gas entrance of heat exchanger, First Heat Exchanger connects purified synthesis gas device by pipeline, closes out
At the cryogenic gas entrance for being connected to First Heat Exchanger after air purifying apparatus, the cryogenic gas outlet of First Heat Exchanger connects through pipeline
It is connected to the cryogenic gas entrance of the second heat exchanger, the cryogenic gas outlet of the second heat exchanger is connected to soild oxide combustion through pipeline
Expect the anode inlet of battery, the anode exhaust gas output channel of solid oxide fuel cell is connected to the High Temperature Gas of the second heat exchanger
Body entrance, the high-temperature gas outlet of the second heat exchanger are connected to the gas access of gas-liquid separator through pipeline, gas-liquid separator
Gas vent is connected to the anode exhaust gas entrance of steam boiler through pipeline,
Another branch pipe separated from the oxygen output tube road of air separation unit is connected to the oxygen intake of steam boiler, steam copper
The oxygen output tube road of furnace is connected to the cryogenic gas entrance of third heat exchanger, and the cryogenic gas of third heat exchanger is exported through pipeline
It is connected to the cathode inlet of solid oxide fuel cell, the cathode exhaust gas outlet connection third of solid oxide fuel cell is changed
The high-temperature gas outlet of the high-temperature gas entrance of hot device, third heat exchanger is connected to by pipeline through returning after the 4th heat exchanger
The steam output pipe of the cathode exhaust gas entrance of steam boiler, steam boiler is connected to the steam inlet of steam turbine, vapor wheel
By transmission axis connection between machine and generator, to drive electrical power generators.
Further, the purified synthesis gas device include by the sequentially connected particulate matter removing device of gas pipeline,
Desulfurizer and mercury removal device.
Preferably, the particulate matter removing device is sack cleaner or electric precipitator, removes the particulate matter in synthesis gas,
So that particle content is less than 200mg/Nm3, preferably shorter than 100mg/Nm3。
Desulfurizer is preferably to use the device of low-temp methanol method or NHD method known to art technology, so that exit
Total sulfur content is less than 1ppm, preferably smaller than 0.5ppm.Mercury removal device preferably uses the mercury in activated carbon method removing synthesis gas, makes
It obtains mercury content in exit gas and is lower than 0.03mg/Nm3, preferably shorter than 0.01mg/Nm3。
Further, the First Heat Exchanger is the plate heat exchanger for realizing synthesis gas and purified gas heat exchange, and second changes
Hot device is the plate heat exchanger that anode of solid oxide fuel cell tail gas and purified gas carry out heat exchange, and third heat exchanger is solid
Oxide body fuel battery negative pole tail gas and oxygen carry out the plate heat exchanger of heat exchange.
Further, the high-temperature gas entrance of the 4th heat exchanger is connected to the high-temperature gas outlet of third heat exchanger,
The cryogenic liquid inlet of 4th heat exchanger is connected to cold water pipe, preferably shell-and-tube heat exchanger.
Further, the solid oxide fuel cell is made of anode, cathode and electrolyte, anode and cathode difference
In the two sides of electrolyte, the material of electrolyte, cathode and anode is ceramics, has structure of whole solid state, avoids electrolyte
Corrosion and leakage problem.Electrochemical reaction occurs in solid oxide fuel cell for synthesis gas and oxygen, exports electric energy, fuel
Battery operating temperature is at 700-1000 DEG C.
Further, the gasification furnace is equipped with solid coal entrance.
Further, the gas-liquid separator is equipped with hot water outlet.
Further, the condensate output transistor road of the steam turbine returns to the cold water inlet for being connected to steam boiler.
Preferred Deep Cooling Method realizes the separation of nitrogen and oxygen in air separation unit.
In gasification furnace, the main component for the synthesis gas that coal gasification reaction generates occurs for coal and oxygen for H2、H2O、CO、
CO2、CH4、H2S etc..
Invention further provides a kind of integral coal gasification solid oxide fuel cell electrification technique, including walk as follows
It is rapid:
(1) air is passed through air separation unit, oxygen and nitrogen separation in air separation unit, the oxygen that oxygen passes through air separation unit
Output channel is divided into two strands, one enters gasification furnace and coal occurs coal gasification reaction and generates synthesis gas, the conjunction exported from gasification furnace
It is such as 800-900 DEG C at temperature degree, further 830-880 DEG C, synthesis gas components are generally CO:30~70V%, H2: 5~
30V%, CO2: 5~15V%, H2O:0~15V%, CH4: 0~5V%, H2S:0~8V%, height of the synthesis gas through First Heat Exchanger
After warm gas access enters First Heat Exchanger heat exchange, temperature is reduced to 100 DEG C hereinafter, such as 50-100 DEG C, then changes from first
The high-temperature gas outlet of hot device is output and then enter particulate matter removing device (such as sack cleaner or electric precipitator), so that particle
Object content is lower than 200mg/Nm3, preferably shorter than 100mg/Nm3；It is passed through desulfurizer again (using low temperature known to art technology
Methanol method or NHD method) so that total sulfur concentration is lower than 1ppm, preferably shorter than 0.5ppm；It is passed through mercury removal device again, (such as using
Active carbon) mercury in removing synthesis gas, so that mercury content is lower than 0.03mg/Nm3, preferably shorter than 0.01mg/Nm3, after purification
Synthesis gas return again to the cryogenic gas entrance through First Heat Exchanger and enter First Heat Exchanger, with high temperature non-purified synthesis gas into
Row heat exchange is warming up to 450-550 DEG C, and further about 500 DEG C, then the cryogenic gas entrance through the second heat exchanger enters and second changes
Hot device and the anode exhaust gas of solid oxide fuel cell, which are exchanged heat, (such as is warming up to 600-800 DEG C, further 650-750
DEG C, for example, about 700 DEG C) afterwards enter fuel cell anode,
At the same time, another strand of oxygen separated from air separation unit oxygen output tube road enters through the cryogenic gas of steam boiler
Mouth enters steam boiler acquisition anode of solid oxide fuel cell tail gas and the heat of cathode exhaust gas burning is warming up to 400-500
DEG C, for example, about 450 DEG C, then the cryogenic gas entrance through third heat exchanger enters the cathode tail of third heat exchanger and fuel cell
Gas carries out heat exchange, and the cathode of fuel cell is entered after being warming up to 600-800 DEG C, further 650-750 DEG C, for example, about 700 DEG C,
(2) synthesis gas and oxygen chemically react in solid oxide fuel cell, electric energy are exported, from solid oxidation
Object fuel cell anode output anode exhaust gas temperature be 800-900 DEG C, further about 850 DEG C, the height through the second heat exchanger
Warm gas access enters the second heat exchanger and the heat exchange cooling of purified synthesis gas (such as to about 100 DEG C hereinafter, further about
50-100 DEG C) enter gas-liquid separator afterwards, the hot water that anode exhaust gas is isolated in gas-liquid separator is as output of products, separation
The CO and H in gas phase out2Gas vent through gas-liquid separator enters steam boiler, and fuel battery negative pole exhaust temperature is
800-900 DEG C, further about 850 DEG C, the high-temperature gas entrance through third heat exchanger enters the above-mentioned steaming out of third heat exchanger preheating
After the oxygen of boiler furnace, the high-temperature gas entrance through the 4th heat exchanger is entered into the heating of the 4th heat exchanger by cold water pipe cold
Water, then the cathode exhaust gas entrance through steam boiler enters steam boiler and anode exhaust gas burns, and the heat of acquisition makes steam copper
Furnace generates steam and preheats the oxygen from air separation unit oxygen output tube road, realizes heat recovery；
(3) steam that steam boiler generates enters steam turbine through the steam output pipe of steam boiler, drives vapor wheel
Machine rotation, steam turbine drive electrical power generators through transmission shaft.
Wherein, the ratio for introducing the amount of the oxygen of gasification furnace and the amount of coal is 300~1000Nm3 oxygen/ton dry coal, is entered
The oxygen of gasification furnace and the proportional region for entering the oxygen of catalytic burner are 1:30~1:10, further such as 1:25~1:
15, the synthesis gas into anode and the oxygen volume ratio into cathode are 1:5~1:15, further such as 1:8~1:12.
Beneficial effects of the present invention:
(1) using solid oxide fuel cell as generator unit, the fuel cell is using ceramic material as electrolysis
The material of matter, cathode and anode, have structure of whole solid state, avoid using molten carbonate fuel cell electrolyte corrosion and
Leakage problem；
(2) purified synthesis gas can eliminate water-gas shift directly as the fuel of solid oxide fuel cell
Device, decarbonization device and catalyst etc. save investment；
(3) generating efficiency and the energy are further improved using solid oxide fuel cell-steam turbine cogeneration
Utilization rate；
(4) heat of gasification furnace exiting syngas, anode of fuel cell tail gas and cathode exhaust gas is sufficiently recycled using heat exchanger
It measures to fuel cell inlet synthesis gas and oxygen heating, has saved energy consumption, improve system thermal efficiency.
Detailed description of the invention
Fig. 1 is a kind of integral coal gasification solid oxide fuel cell-steam turbine combined generating system of the invention
Structural schematic diagram.
Specific embodiment
The present invention is described further with reference to the accompanying drawings and detailed description.
As shown in Figure 1, a kind of integral coal gasification solid oxide fuel cell-steam turbine cogeneration system of the invention
System, the system include by air oxygen and nitrogen separate air separation unit 1, to make coal and oxygen that coal gasification occur anti-
The purified synthesis gas that the gasification furnace 2 with oxygen intake and coal entrance of synthesis gas should be generated, carry out purified treatment to synthesis gas
Device, the gas-liquid separator 9 of gas-liquid separation is carried out to anode exhaust gas, makes anode exhaust gas and yin solid oxide fuel cell 7
Pole tail gas reacts heat production and preheated oxygen and generates the steam boiler 10 of steam, steam turbine 13, generator 14 and be used for heat
Exchange the first, second, third and fourth 3,8,11,12 heat exchangers, the gas access of the air separation unit 1 and air inlet duct
Road connection, the oxygen output tube road of air separation unit 1 are divided into two branch pipes, and a branch pipe is connected to the oxygen intake of gasification furnace 2, gas
The synthesis gas output channel for changing furnace 2 is connected to the high-temperature gas entrance of First Heat Exchanger 3, and the high-temperature gas of First Heat Exchanger 3 goes out
Mouth connects purified synthesis gas device by pipeline, returns to the low temperature gas for being connected to First Heat Exchanger 3 after purified synthesis gas device out
Body entrance, the cryogenic gas outlet of First Heat Exchanger 3 are connected to the cryogenic gas entrance of the second heat exchanger 8 through pipeline, and second changes
The cryogenic gas outlet of hot device 8 is connected to the anode inlet of solid oxide fuel cell 7, solid oxide fuel electricity through pipeline
The anode exhaust gas output channel in pond 7 is connected to the high-temperature gas entrance of the second heat exchanger 8, and the high-temperature gas of the second heat exchanger 8 goes out
Mouth is connected to the gas access of gas-liquid separator 9 through pipeline, and the gas vent of gas-liquid separator 9 is connected to steam boiler through pipeline
10 anode exhaust gas entrance,
Another branch pipe separated from the oxygen output tube road of air separation unit 1 is connected to the oxygen inlet of steam boiler 10, steams
The oxygen output tube road of boiler furnace 10 is connected to the cryogenic gas entrance of third heat exchanger 11, the cryogenic gas of third heat exchanger 11
Outlet is connected to the cathode inlet of solid oxide fuel cell 7 through pipeline, and the cathode exhaust gas of solid oxide fuel cell 7 goes out
The high-temperature gas entrance of mouth connection third heat exchanger 11, the high-temperature gas outlet of third heat exchanger 11 is by pipeline through the 4th heat exchange
The cathode exhaust gas entrance for being connected to steam boiler 10 is returned to after device 12, the steam output pipe of steam boiler 10 is connected to steam
The steam inlet of turbine 13, steam turbine 13 drive generator 14 to generate electricity by transmission shaft.
Further, the purified synthesis gas device include by the sequentially connected particulate matter removing device 4 of gas pipeline,
Desulfurizer 5 and mercury removal device 6,
Preferably, the particulate matter removing device 4 is sack cleaner or electric precipitator, removes the particle in synthesis gas
Object, so that particle content is less than 200mg/Nm3, preferably shorter than 100mg/Nm3。
Desulfurizer 5 is using low-temp methanol method or NHD method known to art technology, so that exit total sulfur content is less than
1ppm, preferably smaller than 0.5ppm.Mercury removal device 6 is preferably using the mercury in activated carbon method removing synthesis gas, so that exit gas
Middle mercury content is lower than 0.03mg/Nm3, preferably shorter than 0.01mg/Nm3。
Further, the First Heat Exchanger 3 is the plate heat exchanger for realizing synthesis gas and purified gas heat exchange, and second changes
Hot device 8 is the plate heat exchanger that 7 anode exhaust gas of solid oxide fuel cell and purified gas carry out heat exchange, third heat exchanger 11
The plate heat exchanger of heat exchange is carried out for 7 cathode exhaust gas of solid oxide fuel cell and oxygen.
Further, the high-temperature gas that the high-temperature gas entrance of the 4th heat exchanger 12 is connected to third heat exchanger 11 goes out
Mouthful, the cryogenic liquid inlet of the 4th heat exchanger 12 is connected to cold water pipe, preferably shell-and-tube heat exchanger.
Further, the solid oxide fuel cell 7 is made of anode, cathode and electrolyte, anode and cathode point
Not in the two sides of electrolyte, the material of electrolyte, cathode and anode is ceramics, has structure of whole solid state, avoids electrolyte
Corrosion and leakage problem.Electrochemical reaction occurs in solid oxide fuel cell 7 for synthesis gas and oxygen, exports electric energy,
Temperature of fuel cell is at 700-1000 DEG C.
Further, the gasification furnace 2 is equipped with solid coal entrance.
Further, the gas-liquid separator 9 is equipped with hot water outlet.
Further, the cold water that the condensate output transistor road return of the steam turbine 13 is connected to steam boiler 10 enters
Mouthful.
Preferred Deep Cooling Method realizes the separation of nitrogen and oxygen in air separation unit 1.
In gasification furnace 2, the main component for the synthesis gas that coal gasification reaction generates occurs for coal and oxygen for H2、H2O、CO、
CO2、CH4、H2S etc..
Invention further provides a kind of integral coal gasification solid oxide fuel cell-steam turbine cogeneration works
Skill includes the following steps:
(1) air is passed through air separation unit 1, oxygen and nitrogen separation in air separation unit 1, and oxygen passes through air separation unit 1
Oxygen output tube road is divided into two strands, one enters gasification furnace 2 and coal occurs coal gasification reaction and generates synthesis gas, defeated from gasification furnace 2
Synthesis gas temperature out is 800-900 DEG C, and synthesis gas components are CO:30~70V%, H2: 5~30V%, CO2: 5~15V%,
H2O:0~15V%, CH4: 0~5V%, H2S:0~8V%.Synthesis gas enters first through the high-temperature gas entrance of First Heat Exchanger 3
After heat exchanger 3 exchanges heat, temperature is reduced to 100 DEG C to be output and then enter electricity hereinafter, then exporting from the high-temperature gas of First Heat Exchanger 3
Deduster, so that particle content is lower than 200mg/Nm3；It is passed through desulfurizer again, low-temp methanol method is used to make total sulfur concentration
Lower than 1ppm；It is passed through mercury removal device again, using the mercury in active carbon removing synthesis gas, is lower than mercury content in gas
0.03mg/Nm3, purified synthesis gas returns again to the cryogenic gas entrance through First Heat Exchanger 3 and enters First Heat Exchanger 3, with
The non-purified synthesis gas of high temperature carries out heat exchange and is warming up to 450-550 DEG C, then the cryogenic gas entrance through the second heat exchanger 8 enters
Second heat exchanger 8 and the anode exhaust gas of solid oxide fuel cell 7 exchange heat, and fuel is entered after being warming up to 650-750 DEG C
The anode of battery,
At the same time, another strand of low temperature of the oxygen through steam boiler 10 separated from the oxygen output tube road of air separation unit 1
Gas access enters steam boiler 10, obtains the heat liter of 7 anode exhaust gas of solid oxide fuel cell and cathode exhaust gas burning
Wen Zhiyue 400-500 DEG C, then the cryogenic gas entrance through third heat exchanger 11 enters third heat exchanger 11 and fuel cell
Cathode exhaust gas carries out heat exchange, and the cathode of fuel cell is entered after being warming up to 650-750 DEG C,
(2) synthesis gas and oxygen chemically react in solid oxide fuel cell 7, electric energy are exported, from solid oxygen
The anode exhaust gas temperature of the anode output of compound fuel cell 7 is 800-900 DEG C, the high-temperature gas entrance through the second heat exchanger 8
Enter gas-liquid separator 9 after being cooled to 100 DEG C or less with the heat exchange of purified synthesis gas into the second heat exchanger 8, in gas-liquid point
The hot water isolated from anode exhaust gas in device 9 is as output of products, the CO and H in gas phase that isolate2Through gas-liquid separator 9
Gas vent enters steam boiler 10.Fuel battery negative pole exhaust temperature is 800-900 DEG C, the High Temperature Gas through third heat exchanger 11
After body entrance enters 11 preheated oxygen of third heat exchanger, the high-temperature gas entrance through the 4th heat exchanger 12 enters the 4th heat exchanger 12
After heating the cold water that cold water pipe enters, then the cathode exhaust gas entrance through steam boiler 10 enters steam boiler 10, with anode tail
The heat that gas burning obtains, heating boiler water pipe fill so that steam boiler 10 generates steam and preheats as described above from space division
The oxygen in 1 oxygen output tube road is set, realizes heat recovery.
(3) steam that steam boiler 10 generates enters steam turbine 13 through the steam output pipe of steam boiler 10, drives
Steam turbine 13 rotates, and steam turbine 13 drives generator 14 to generate electricity through transmission shaft, and the condensed water of steam turbine 13 is through condensed water
Output channel is back to steam boiler 10, realizes the recycling of steam.
Embodiment 1
(1)41750Nm3/ min air is passed through air separation unit 1, and oxygen and nitrogen separation, oxygen pass through in air separation unit 1
The oxygen output tube road of air separation unit 1 is divided into two strands, one (flow 350Nm3/ min) enter gasification furnace 2 and 0.6t/min coal hair
Soft coal gasification reaction generates synthesis gas, and the synthesis gas temperature exported from gasification furnace 2 is 800-900 DEG C, synthesis gas components CO:30
~70V%, H2: 5~30V%, CO2: 5~15V%, H2O:0~15V%, CH4: 0~5V%, H2S:0~8V%.Synthesis gas warp
The high-temperature gas entrance of First Heat Exchanger 3 enter First Heat Exchanger 3 exchange heat after, temperature be reduced to 100 DEG C hereinafter, then from first
The high-temperature gas outlet of heat exchanger 3 is output and then enter electric precipitator 4, so that particle content is lower than 200mg/Nm3；It is passed through again de-
Sulphur device 5 uses low-temp methanol method to make total sulfur concentration lower than 1ppm；It is passed through mercury removal device 6 again, is removed and is closed using active carbon
At the mercury in gas, mercury content in gas is made to be lower than 0.03mg/Nm3, purified synthesis gas (1000Nm3/ min) it returns again to through
The cryogenic gas entrance of one heat exchanger 3 enters First Heat Exchanger 3, carries out heat exchange with the non-purified synthesis gas of high temperature and is warming up to about
500 DEG C, then the cryogenic gas entrance through the second heat exchanger 8 enters the anode of the second heat exchanger 8 with solid oxide fuel cell 7
Tail gas exchanges heat, and the anode of fuel cell is entered after being warming up to about 700 DEG C,
At the same time, another gang of oxygen (8000Nm separated from the oxygen output tube road of air separation unit 13/ min) through steam
The cryogenic gas entrance of boiler 10 enters steam boiler 10, obtains 7 anode exhaust gas of solid oxide fuel cell and cathode exhaust gas
The heat of burning is warming up to about 450 DEG C, and then the cryogenic gas entrance through third heat exchanger 11 enters third heat exchanger 11 and combustion
Expect that the cathode exhaust gas of battery carries out heat exchange, the cathode of fuel cell entered after being warming up to about 700 DEG C,
(2) synthesis gas and oxygen chemically react in solid oxide fuel cell 7, electric energy are exported, from solid oxygen
The anode exhaust gas temperature of the anode output of compound fuel cell 7 is 800-900 DEG C, the high-temperature gas entrance through the second heat exchanger 8
Enter gas-liquid separator 9 after being cooled to 100 DEG C or less with the heat exchange of purified synthesis gas into the second heat exchanger 8, in gas-liquid point
The hot water isolated from anode exhaust gas in device 9 is as output of products, the CO and H in gas phase that isolate2Through gas-liquid separator 9
Gas vent enters steam boiler 10.Fuel battery negative pole exhaust temperature is 800-900 DEG C, the High Temperature Gas through third heat exchanger 11
After body entrance enters 11 preheated oxygen of third heat exchanger, the high-temperature gas entrance through the 4th heat exchanger 12 enters the 4th heat exchanger 12
After heating the cold water that cold water pipe enters, then the cathode exhaust gas entrance through steam boiler 10 enters steam boiler 10, with anode tail
The heat that gas burning obtains, heating boiler water pipe fill so that steam boiler 10 generates steam and preheats as described above from space division
The oxygen in 1 oxygen output tube road is set, realizes heat recovery.
(3) steam that steam boiler 10 generates enters steam turbine 13 through the steam output pipe of steam boiler 10, drives
Steam turbine 13 rotates, and steam turbine 13 drives generator 14 to generate electricity through transmission shaft, and the condensed water of steam turbine 13 is through condensed water
Output channel is back to steam boiler 10, realizes the recycling of steam.
Claims (10)
1. a kind of integral coal gasification solid oxide fuel cell-steam turbine combined generating system, it is characterised in that: it includes
By in air oxygen and nitrogen separate air separation unit, make coal and oxygen that the tool that coal gasification reaction generates synthesis gas occur
There are the gasification furnace of oxygen intake and coal entrance, the purified synthesis gas device that purified treatment is carried out to synthesis gas, soild oxide to fire
Material battery carries out the gas-liquid separator of gas-liquid separation to anode exhaust gas, anode exhaust gas is made to react with cathode exhaust gas heat production and pre-
Hot oxygen and generate the steam boiler of steam, steam turbine, generator and for the first, second, third of heat exchange and the
The gas access of four heat exchangers, the air separation unit is connect with air inlet pipe, and the oxygen output tube road of air separation unit is divided into
Two branch pipes, a branch pipe are connected to the oxygen intake of gasification furnace, and the synthesis gas output channel of gasification furnace is connected to the first heat exchange
The high-temperature gas outlet of the high-temperature gas entrance of device, First Heat Exchanger connects purified synthesis gas device by pipeline, out synthesis gas
The cryogenic gas entrance for being connected to First Heat Exchanger is returned to after purification device, the cryogenic gas outlet of First Heat Exchanger connects through pipeline
It is connected to the cryogenic gas entrance of the second heat exchanger, the cryogenic gas outlet of the second heat exchanger is connected to soild oxide combustion through pipeline
Expect the anode inlet of battery, the anode exhaust gas output channel of solid oxide fuel cell is connected to the High Temperature Gas of the second heat exchanger
Body entrance, the high-temperature gas outlet of the second heat exchanger are connected to the gas access of gas-liquid separator through pipeline, gas-liquid separator
Gas vent is connected to the anode exhaust gas entrance of steam boiler through pipeline,
Another branch pipe separated from the oxygen output tube road of air separation unit is connected to the oxygen intake of steam boiler, steam boiler
Oxygen output tube road is connected to the cryogenic gas entrance of third heat exchanger, and the cryogenic gas outlet of third heat exchanger is connected through pipeline
In the cathode inlet of solid oxide fuel cell, the cathode exhaust gas outlet connection third heat exchanger of solid oxide fuel cell
High-temperature gas entrance, the high-temperature gas outlet of third heat exchanger is connected to steam through returning after the 4th heat exchanger by pipeline
The cathode exhaust gas entrance of boiler, the steam output pipe of steam boiler are connected to the steam inlet of steam turbine, steam turbine with
Pass through transmission axis connection between generator.
2. electricity generation system according to claim 1, it is characterised in that: the purified synthesis gas device includes passing through appendix
The sequentially connected particulate matter removing device in road, desulfurizer and mercury removal device,
Preferably, the particulate matter removing device is sack cleaner or electric precipitator, removes the particulate matter in synthesis gas.
3. electricity generation system according to claim 1, it is characterised in that: the First Heat Exchanger is to realize synthesis gas and purification
The plate heat exchanger of gas heat exchange, the second heat exchanger are that anode of solid oxide fuel cell tail gas and purified gas carry out heat exchange
Plate heat exchanger, third heat exchanger is the plate-type heat-exchange that cathode of solid oxide fuel cell tail gas and oxygen carry out heat exchange
Device.
4. -3 described in any item electricity generation systems according to claim 1, it is characterised in that: the High Temperature Gas of the 4th heat exchanger
Body entrance is connected to the high-temperature gas outlet of third heat exchanger, and the cryogenic liquid inlet of the 4th heat exchanger is connected to cold water pipe, excellent
It is selected as shell-and-tube heat exchanger.
5. -4 described in any item electricity generation systems according to claim 1, it is characterised in that: the solid oxide fuel cell
It is made of anode, cathode and electrolyte, anode and cathode is respectively in the two sides of electrolyte, the material of electrolyte, cathode and anode
It is ceramics, there is structure of whole solid state.
6. -5 described in any item electricity generation systems according to claim 1, it is characterised in that: the gasification furnace is equipped with solid coal and enters
Mouthful.
7. -6 described in any item electricity generation systems according to claim 1, it is characterised in that: the gas-liquid separator is equipped with hot water
Outlet.
8. -7 described in any item electricity generation systems according to claim 1, it is characterised in that: the condensed water of the steam turbine is defeated
Pipeline returns to the cold water inlet for being connected to steam boiler out.
9. a kind of integral coal gasification solid oxide fuel cell electrification technique, includes the following steps:
(1) air is passed through air separation unit, oxygen and nitrogen separation in air separation unit, and oxygen is exported by the oxygen of air separation unit
Pipeline is divided into two strands, one enters gasification furnace and coal occurs coal gasification reaction and generates synthesis gas, the synthesis gas exported from gasification furnace
Temperature is 800-900 DEG C, and after the high-temperature gas entrance of First Heat Exchanger enters First Heat Exchanger heat exchange, temperature reduces synthesis gas
To 100 DEG C hereinafter, then particulate matter removing device is output and then enter from the outlet of the high-temperature gas of First Heat Exchanger, so that particulate matter
Content is lower than 200mg/Nm3；It is passed through desulfurizer again, so that total sulfur concentration is lower than 1ppm；The removing of mercury removal device is passed through again to close
At the mercury in gas, mercury content in gas is made to be lower than 0.03mg/Nm3, purified synthesis gas returns again to through the low of First Heat Exchanger
Warm gas access enters First Heat Exchanger, carries out heat exchange with the synthesis gas exported from gasification furnace and is warming up to 450-550 DEG C, then passes through
The cryogenic gas entrance of second heat exchanger enters the second heat exchanger and the anode exhaust gas of solid oxide fuel cell exchanges heat,
Enter the anode of fuel cell after being warming up to 600-800 DEG C,
At the same time, cryogenic gas entrance of another strand of oxygen through steam boiler separated from air separation unit oxygen output tube road into
Enter steam boiler, obtains the heat of anode of solid oxide fuel cell tail gas and cathode exhaust gas burning and be warming up to 400-500
DEG C, then the cryogenic gas entrance through third heat exchanger enters third heat exchanger and the cathode exhaust gas of fuel cell carries out hot friendship
It changes, the cathode of fuel cell is entered after being warming up to 600-800 DEG C,
(2) purified synthesis gas and oxygen chemically react in solid oxide fuel cell, electric energy are exported, from solid
The anode exhaust gas temperature of the anode output of oxide fuel cell is 800-900 DEG C, the high-temperature gas entrance through the second heat exchanger
Enter gas-liquid separator, the anode exhaust gas in gas-liquid separator after into the second heat exchanger and the heat exchange cooling of purified synthesis gas
The hot water isolated is as output of products, the CO and H in gas phase that isolate2Gas vent through gas-liquid separator enters steam
Boiler；Fuel battery negative pole exhaust temperature is 800-900 DEG C, and the high-temperature gas entrance through third heat exchanger enters third heat exchanger
After preheating the above-mentioned oxygen of steam boiler out, the high-temperature gas entrance through the 4th heat exchanger enters the 4th heat exchanger and heats by cold water
The cold water that pipe enters, then the cathode exhaust gas entrance through steam boiler enters steam boiler and anode exhaust gas burns, the heat of acquisition
Amount heating steam boiler water pipe makes steam boiler generate steam and preheats the oxygen from air separation unit oxygen output tube road, real
Existing heat recovery；
(3) steam that steam boiler generates enters steam turbine through the steam output pipe of steam boiler, and steam turbine is driven to turn
Dynamic, steam turbine drives electrical power generators through transmission shaft.
10. electrification technique according to claim 9, wherein the ratio for introducing the amount of the oxygen of gasification furnace and the amount of coal is
300~1000Nm3The proportional region of oxygen/ton dry coal, the oxygen into gasification furnace and the oxygen into catalytic burner is 1:
30~1:10, the synthesis gas into anode and the oxygen volume ratio into cathode are 1:5~1:15.
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