CN1240156C - Coal gasification two stage high temperature fuel battery electric generating system - Google Patents
Coal gasification two stage high temperature fuel battery electric generating system Download PDFInfo
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- CN1240156C CN1240156C CNB031163041A CN03116304A CN1240156C CN 1240156 C CN1240156 C CN 1240156C CN B031163041 A CNB031163041 A CN B031163041A CN 03116304 A CN03116304 A CN 03116304A CN 1240156 C CN1240156 C CN 1240156C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The present invention relates to a power generation system for a coal gasification two-stage high-temperature fuel cell, which adopts a fused carbonate fuel cell and a steam turbine combined cycle generation mode. Gas at a negative pole and a positive pole of the fuel cell is independently preheated; the preheated reaction gas firstly passes through the primary fuel cell; gas discharged by the primary fuel cell is sent to the secondary fuel cell to participate in electrochemical reaction after temperature drop. The power generation system adopts two MW stage fuel cells, preheats a fuel agent and an oxidant by two stages of heat exchangers and realizes the step utilization of energy. Part of fuel not utilized by the fuel cells is mixed with part of initial fuel; after the heat productivity is enhanced, the part of fuel and the part of initial fuel are sent to a residual heat boiler for combustion. By an auxiliary generating device, the energy conversion efficiency is further enhanced.
Description
Technical field:
The present invention relates to a kind of electricity generation system, relating in particular to a kind of is the two-stage high-temperature fuel cell steam turbine combined generating system of fuel with the underground gas, belongs to the energy utilization technology field.
Background technology:
In order to protect environment and to improve efficiency of energy utilization, the novel generation technology of development is badly in need of in countries in the world.Fuel cell technology is hopeful to enter electricity market with the form of concentrated and decentralized power s most.It is that chemical energy with fuel is converted into electric energy, and is not subjected to the restriction of Carnot cycle.Wherein, molten carbonate fuel cell (Molten Carbonate Fuel Cell; MCFC) have efficiently, hang down advantages such as pollution, greatly be subjected to people and pay close attention to.
The coal of China is mainly used in generating at present, and the efficient of thermal power generation has only 40%, and contaminated environment.Also there are problems such as resource transportation and war destruction in large-scale thermal power generation.Along with the extensive application of new forms of energy, the distributed power generation mode will be developed rapidly, and the distributed generation system of MW level can be widely used.It can satisfy the need for electricity of small business on the one hand, can reduce the impact that disasters such as earthquake, war cause society on the other hand.
Some fuel cell generations have been announced abroad, great majority are to be fuel with the natural gas, adopt fuel cell and gas turbine to form combined cycle mode (the Wei He.Numerical analysis ofmolten carbonate fuel cell systems.International Journal of Energy Research that generates electricity, 1997,21:69-76.).But one side is owing to gas turbine involves great expense, and developing country does not have the technology of this respect, the very difficult popularization; On the other hand, because this kind circulating generation mode requires system will reach certain pressure, so having relatively high expectations to fuel battery performance.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of coal gasification two-stage high-temperature fuel cell electricity generation system is provided, further improve the feasibility of fuel cell combined cycle generation technology, the technical difficulty of reduction system, can be in the area that the underground gas field is arranged as small hydropower station, or help unit such as chemical plant to improve energy use efficiency.
For realizing such purpose, in the technical scheme of the present invention, having proposed is the secondary high-temperature fuel cell steam turbine combined generating system of fuel with the underground gas, combined generating system is made of equipment such as secondary high-temperature fuel cell, waste heat boiler, steam turbine, generator, heat exchangers, electric energy is by fuel cell and generator combined providing, system can also provide a certain amount of hot water for the external world except that generating.
Electricity generation system of the present invention mainly is divided into molten carbonate fuel cell and auxiliary generating system two parts, fuel cell utilizes hydrogen, carbon monoxide and air generation electrochemical reaction, produce electric energy, auxiliary generating system utilizes waste heat boiler and steam turbine to produce electric energy.
Fuel is divided into the two-way feed system, and one the tunnel through being sent to the anode of fuel cell inlet behind anode of fuel cell back and the waste heat boiler waste heat, deliver to the waste heat boiler burning after another road and anode of fuel cell exhaust mix.The required oxidant of fuel cell through two cathode exhaust gas heat exchangers and waste heat boiler preheating after, be sent to the fuel battery negative pole inlet, in fuel battery inside generation electrochemical reaction, and produce electric energy and heat.Connect a desulfurizer at the secondary fuel galvanic anode exhaust gas heat exchanger port of export, the other end of desulfurizer is connected to waste heat boiler.The anode export of secondary fuel battery connects a heat exchanger successively and is used for producing the water heater of hot water, and the port of export of water heater is linked the burner hearth of waste heat boiler, is used for further improving fuel availability.Steam turbine one end that is connected with generator coaxle connects the steam-heating pipe of burner hearth, and the other end is linked condenser, again the steam-heating pipe in condensate pump is connected to waste heat boiler.
The outlet of one-level fuel battery negative pole connects a heat exchanger, delivers to the secondary fuel battery after its outlet cathode exhaust gas is lowered the temperature through heat exchanger and continues to participate in electrochemical reaction.The outlet of secondary fuel cell cathode connects a heat exchanger, is used to reclaim heat energy.Heated cathode gas enters one-level fuel battery negative pole inlet after being sent to the waste heat boiler heating.
During system works, at first fuel gas being sent into heat exchanger heats up, arrive the desulfurizer desulfurization then, the anode of delivering to fuel cell after fuel after the desulfurization heats through waste heat boiler generates electricity, anode exhaust is lowered the temperature through the two poles of the earth heat exchanger, produce hot water through a water heater again, cooled anode of fuel cell exhaust and part original fuel are together sent into the waste heat boiler burning, the heat of burning is used for heating the water generates high temperature and high pressure steam, the steam that boiler produces promotes the steam turbine running, drives generator and produces electric energy.
In addition, air in certain amount and CO
2After the air compressor compression, the heat exchanger of sending into the fuel battery negative pole outlet is heated, and the negative electrode mist after the heating is delivered to fuel battery negative pole, and cathode exhaust gas at first through after the cooling of the two poles of the earth heat exchanger, is delivered to decarbonizer again, takes off CO
2After cathode exhaust gas directly be discharged in the atmosphere.
At last, the electric energy of fuel cell and generator generation is delivered to the user.
The present invention compared with prior art has tangible progress and beneficial effect.The present invention has adopted two MW level fuel cells, by the two-stage heat exchanger preheating is carried out in fuel agent and oxidant, has realized the cascade utilization of energy; Part of fuel and the part original fuel that is utilized by fuel cell mixes, and after the raising caloric value, delivers to the waste heat boiler burning, by auxiliary generating plant, further improves energy transformation efficiency.
The present invention adopts the mode of molten carbonate fuel cell and steam turbine combined cycle generation, can directly utilize the waste gas of underground gas or chemical plant emission, has effectively improved energy utilization rate, has reduced the discharging of greenhouse gas.
Description of drawings:
Fig. 1 is a system configuration schematic diagram of the present invention.
Among Fig. 1,1 is the AC/DC transducer, and 2 is the one-level fuel cell, and 3 is fuel compressor, 4,5,7 is heat exchanger, and 6 is air compressor, and 8 is hot water heat exchanger, 9 is desulfurizer, and 10 is waste heat boiler, and 11 is chimney, 12 is condensate pump, and 13 is condenser, and 14 is steam turbine, 15 is generator, and 16 is hot water heat exchanger, and 17 are secondary fuel cell cathode outlet heat exchanger, 18 is water supply pump, and 19 is decarbonizer, and 20 is the secondary fuel battery.
Embodiment:
For understanding technical scheme of the present invention better, be further described below in conjunction with accompanying drawing.
System configuration of the present invention as shown in Figure 1.One-level fuel cell 2 anode export ends connect heat exchanger 4 inlets, and the outlet of heat exchanger 4 connects secondary fuel battery 20 anode inlet, and secondary fuel battery 20 anode exports connect heat exchanger 7 and hot water heat exchanger 8 successively, and hot water heat exchanger 8 is received waste heat boiler 10.One-level fuel cell 2 cathode outlet ends connect heat exchanger 5 inlets, and the outlet of heat exchanger 5 connects secondary fuel battery 20 cathode inlets, and secondary fuel battery 20 cathode outlets connect heat exchanger 17 and hot water heat exchanger 16 successively, and hot water heat exchanger 16 is received decarbonizer 19.The outlet of fuel compressor 3 connects the arrival end of waste heat boiler burning and heat exchanger 4 respectively, the port of export of heat exchanger 4 is connected to the arrival end of heat exchanger 7, the port of export of heat exchanger 7 is connected to desulfurizer 9, the preheating device of waste heat boiler 10 is received in the outlet of desulfurizer 9, and the outlet of waste heat boiler preheating device is connected to one-level anode of fuel cell inlet.The outlet of air compressor 6 is connected to heat exchanger 5, the outlet of heat exchanger 5 connects the inlet of secondary fuel cell cathode outlet heat exchanger 17, heat exchanger 17 outlets are connected to the preheating device in the waste heat boiler 10, and one-level fuel battery negative pole arrival end is received in the preheating device outlet in the waste heat boiler 10.Water supply pump 18 through hot water heat exchanger 8,16, is connected to the hot water user respectively.With the steam-heating pipe of 14 1 connection waste heat boilers 10 of the generator 15 coaxial steam turbines that are connected, condenser 13 is linked in the other end, again the steam-heating pipe in condensate pump 12 is connected to waste heat boiler 10.
During work, fuel gas heats up through the two poles of the earth heat exchanger respectively, and through after desulfurizer 9 purifications, enter waste heat boiler 10 and continue heating, the anode that fuel after the heating is delivered to one-level fuel cell 2 generates electricity, and anode exhaust arrives the secondary fuel cell power generation again through heat exchanger 4 coolings.Heat energy in the exhaust of secondary fuel galvanic anode is further utilized by heat exchanger 7, does not participate in the fuel of electrochemical reaction and part original fuel and is sent in the waste heat boiler and burns, and the heat of generation is further utilized generating.The hot water that produces in the hot water heat exchanger 8,16 can provide hot water for the user.
The advantage of coal gasification two-stage fuel cell generation is that every grade high-temperature exhaust air can both be fully utilized, reduce fuel agent and oxidant caloric receptivity at waste heat boiler, help improving the efficiency of energy utilization of whole system, and can dwindle the fuel cell pile volume.In addition, owing to electricity generation system is made of the two-stage fuel cell, so the varying duty ability of system is strong.
Claims (1)
1, a kind of coal gasification two-stage high-temperature fuel cell electricity generation system, it is characterized in that one-level fuel cell (2) anode export end connects heat exchanger (4) inlet, the outlet of heat exchanger (4) connects secondary fuel battery (20) anode inlet, secondary fuel battery (20) anode export connects heat exchanger (7) and hot water heat exchanger (8) successively, hot water heat exchanger (8) is received waste heat boiler (10), one-level fuel cell (2) cathode outlet end connects heat exchanger (5) inlet, the outlet of heat exchanger (5) connects secondary fuel battery (20) cathode inlet, secondary fuel battery (20) cathode outlet connects heat exchanger (17) and hot water heat exchanger (16) successively, hot water heat exchanger (16) is received decarbonizer (19), the outlet of fuel compressor (3) connects the arrival end of waste heat boiler (10) and heat exchanger (4) respectively, the port of export of heat exchanger (4) connects the arrival end of the heat exchanger (7) of the secondary fuel galvanic anode port of export, the port of export of heat exchanger (7) is connected to desulfurizer (9), the preheating device of waste heat boiler (10) is received in the outlet of desulfurizer (9), the outlet of waste heat boiler (10) preheating device is connected to one-level anode of fuel cell inlet, the outlet of air compressor (6) is connected to heat exchanger (5), the outlet of heat exchanger (5) connects the inlet of secondary fuel cell cathode outlet heat exchanger (17), heat exchanger (17) outlet is connected to the preheating device of waste heat boiler (10), one-level fuel battery negative pole arrival end is received in the preheating device outlet of waste heat boiler (10), water supply pump (18) is respectively through two hot water heat exchangers (8,16) be connected to the hot water user, steam-heating pipe with coaxial (14) the connection waste heat boilers of the steam turbine that is connected of generator (15) (10), condenser (13) is linked in the other end, again the steam-heating pipe in condensate pump (12) is connected to waste heat boiler (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031163041A CN1240156C (en) | 2003-04-10 | 2003-04-10 | Coal gasification two stage high temperature fuel battery electric generating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031163041A CN1240156C (en) | 2003-04-10 | 2003-04-10 | Coal gasification two stage high temperature fuel battery electric generating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1442923A CN1442923A (en) | 2003-09-17 |
| CN1240156C true CN1240156C (en) | 2006-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031163041A Expired - Fee Related CN1240156C (en) | 2003-04-10 | 2003-04-10 | Coal gasification two stage high temperature fuel battery electric generating system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377375B (en) * | 2014-11-03 | 2016-08-17 | 中国华能集团清洁能源技术研究院有限公司 | A kind of integral coal gasification melting carbonate fuel cell generation system |
| CN109148919B (en) * | 2018-10-11 | 2023-06-09 | 中国华能集团清洁能源技术研究院有限公司 | Integrated coal gasification fuel cell power generation system and method utilizing gas high-temperature sensible heat |
| CN110867599A (en) * | 2019-12-10 | 2020-03-06 | 中国华能集团清洁能源技术研究院有限公司 | High-efficiency integrated coal gasification fuel cell power generation system and method adopting high-temperature purification |
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| Publication number | Publication date |
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| CN1442923A (en) | 2003-09-17 |
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