CN108979769A - Fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use - Google Patents
Fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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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
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
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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
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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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 invention discloses a kind of fuel cell alliance electricity generation systems based on twin-stage ORC and LNG cold energy use, including SOFC system, twin-stage organic rankine cycle system and LNG cold energy use system.The present invention is by coupling existing SOFC system, Organic Rankine Cycle and LNG cold energy use system, change fuel battery negative pole and anode out temperature, air-fuel ratio, vapor carbon ratio and recycling ratio etc. to realize power and refrigeration cogeneration, it can be used for the fields such as medium-sized point of electricity, small household appliances cogeneration, also can be used as the mobile power sources such as stationary electric power plant, ship power power supply, vehicular traffic electrical source of power.
Description
Technical field
The present invention relates to heat pump control technology fields, and in particular to a kind of fuel based on twin-stage ORC and LNG cold energy use
Battery alliance electricity generation system.
Background technique
As world economy continues to develop, electricity needs persistently increases.Meanwhile the whole world is faced with a fossil energy
Exhausted bring energy crisis.In addition, the problems such as environmental pollution, global climate are warmed environmental protection and improvement are produced it is huge
Big pressure.New energy form is opened up, is generated electricity using sustainable development source, it has also become the demand in epoch and inevitable project.
The new power generation energy resource form such as wind energy, solar energy, fuel cell, underground heat, tide energy, biomass energy, can alleviate
Energy crisis, while having again and polluting small environment-friendly advantage, it is introduced in power generation ranks one after another.Fuel cell, which removes, has nothing
The environmental advantages such as the discharge of dust and waste residue, CO2 etc. are less, noise pollution is small, can be again compared with wind-power electricity generation, solar energy power generating etc.
The raw energy, there are also not by the limitation of region, the advantage that fuel is sufficient and fuel backup form is varied etc., convenient for large-scale
It is widely applied.
Fuel cell is the electrochemical energy conversion device that chemical energy is converted into electric energy.It is, in principle, that fuel
Battery is not limited by Carnot cycle, and compared with conventional heat engines, with energy conversion efficiency height, cleanliness without any pollution, noise is low, installs
The advantages that convenient economic.In all fuel cells, high temperature solid oxide fuel cell (Solid Oxide Fuel Cell,
SOFC the operation is stable highest), up to 1000 DEG C.At such high temperatures, fuel energy rapid oxidation and reach thermodynamic equilibrium, it can
Not use noble metal catalyst, to reduce the cost of manufacture of battery, and fuel can be reformed in inside battery.It is discharged
Waste heat taste it is higher, have very big recycling space.
Organic rankine cycle system (Organic Rankine Cycle, ORC) is using low-boiling-point organic compound as operation work
Matter, more traditional power cycle have more advantage in terms of matching with middle low-temperature heat source, therefore have become UTILIZATION OF VESIDUAL HEAT IN has efficacious prescriptions
One of formula.Under the conditions of different heat sources, select different Organic Rankine Cycle structure and operation working medium to lifting system
Thermal performance important in inhibiting.During carrying out exploitation low-grade energy using Organic Rankine Cycle, according to " step is opened
The principle of hair, Multi-class propagation ", the development and utilization of high temperature heat source mostly use and heat source carries out the combination of diversified forms, to be formed
Combined cycle improves the efficiency of energy utilization and overall performance of system.Alliance circulation is laid particular emphasis on multi-form with heat source more at present
It combines, although greatly improving the efficiency of energy utilization of system, increases the complexity of system, to the efficient fortune of system
Row brings great challenge.
It is system coupled using the relatively simple twin-stage Organic Rankine Cycle of form and SOFC based on the above phenomenon, and with
Liquefied natural gas (Liquefied Natural Gas, LNG) effectively improves energy as cold source to realize the cascade utilization of the energy
The utilization rate in source.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention devises a kind of fuel based on twin-stage ORC and LNG cold energy use
Battery alliance electricity generation system is changed by coupling existing SOFC system, Organic Rankine Cycle and LNG cold energy use system
Fuel battery negative pole and anode out temperature, air-fuel ratio, vapor carbon ratio and recycling ratio etc. can be used for realizing power and refrigeration cogeneration
The fields such as medium-sized point of electricity, small household appliances cogeneration also can be used as stationary electric power plant, ship power power supply, vehicular traffic power electric
The mobile power sources such as source.
To achieve the goals above, technical scheme is as follows:
A kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use, including SOFC system, twin-stage
Organic rankine cycle system and LNG cold energy use system；
The SOFC system is configured as that electrochemical reaction occurs by raw material of the mixture of air and fuel and water,
Externally output electric energy；
The SOFC system, is configured as being used in conjunction with gas turbine, the complete fuel gas of the unreacted of anode exhaust with
The excess air of cathode exhaust is admitted to the external expansion work of gas turbine after burning, and generates exhaust, the gas turbine row
Gas is orderly used to preheated air, fuel and water, is then fed to First Heat Exchanger, to drive twin-stage Organic Rankine Cycle system
System；
The twin-stage organic rankine cycle system includes that first order organic rankine cycle system and second level organic Rankine follow
Loop system, the first order organic rankine cycle system are configured as, using LNG as cold source, adopting using combustion turbine exhaustion as heat source
It carries out Rankine cycle with first circulation working medium externally to do work, the second level organic rankine cycle system is configured as with first
The turbine lack of gas of grade organic rankine cycle system are heat source, using LNG as cold source, carry out Rankine cycle pair using second circulation working medium
Outer acting；Wherein, the driving heat source temperature of the first order Organic Rankine Cycle is higher than the driving of second level Organic Rankine Cycle
Heat source temperature；
The LNG cold energy use system is configured as being orderly used to cooling second circulation working medium, first circulation using LNG
Working medium and air, rear portion are used as the electrochemical reaction raw material of SOFC system, and a part is for external expansion work recycling pressure
Power energy.
Further, in the SOFC system, air is through the first air compressor first compression, inter cooler LNG condensation drop
SOFC operating pressure is boosted to after mild second air compressor second-compressed, is then sent to after the preheating of the first preheater
Sofc cathode.
Further, in the SOFC system, fuel is delivered to mixer after the heating of the second preheater, and water is through the first pump
It is forced into SOFC operating pressure, mixer is delivered to after the heating of third air preheater, is sent to SOFC after mixing with fuel
Anode.
Further, the excess air of the unreacted of the SOFC anode discharge complete fuel gas and sofc cathode discharge
It is fed together afterburner to burn, generates high-temperature high-pressure fuel gas, it is external that the high-temperature high-pressure fuel gas is admitted to gas turbine
Expansion work.
Further, the SOFC system external exports direct current, and it is defeated that the direct current through inverter is converted into alternating current
Out.
Further, the first order organic rankine cycle system includes the First Heat Exchanger for circuiting sequentially connection, first
Turbine, the second heat exchanger, the first condenser and the second pump, the first circulation working medium saturated solution are changed through the second pump pressurization and first
After hot device is heated into superheat state, the expansion work in the first turbine becomes turbine lack of gas, and the turbine lack of gas are in the second heat exchange
After discharging partial heat in device, saturated solution is condensed by LNG in the first condenser, and then completes entire circulation.
Further, the first circulation working medium includes but is not limited to toluene, benzene, nonane, octane, MDM and D4.
Further, the second level organic rankine cycle system includes the second heat exchanger for circuiting sequentially connection, second
Turbine, the second condenser and third pump, the second circulation working medium saturated solution are heated into through the pressurization of third pump and the second heat exchanger
After superheat state, the expansion work in the second turbine becomes turbine lack of gas, and the turbine lack of gas are in the second condenser by LNG
It is condensed into saturated solution, and then completes entire circulation.
Further, the second circulation working medium include but is not limited to R600, R245fa, R123, R142b, R236ea and
R600a。
Further, the LNG cold energy use system includes sequentially connected LNG storage tank, the 4th pump, the second condensation
Device, the first condenser, inter cooler and third turbine successively flow after the LNG is forced into SOFC system running pressure by the 4th pump
Through the second condenser, the first condenser and inter cooler, rear part LNG is through the external expansion work of third turbine.
Compared with prior art, the beneficial effects of the present invention are:
1) air compression uses Two-stage Compression, can effectively reduce energy consumption required for compressed air；
2) fuel required for SOFC system is pressurized to SOFC battery pile operating pressure in liquid, can effectively reduce fuel
Wasted work needed for compressing；
3) higher in view of SOFC system exhaust temperature, and using LNG as cold source, using twin-stage ORC circulation as bottoming cycle,
For improve overall thermal efficiency andEfficiency has good effect.
4) for bottoming cycle, it can be used for high temperature heat source of the recovered temperature range at 300 DEG C or more, such as I. C. engine exhaust
Waste heat, combustion turbine exhaustion waste heat etc., there is good effect.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the alliance electricity generation system of the invention based on fuel cell, twin-stage Organic Rankine Cycle and LNG cold energy use
Structural schematic diagram；
Fig. 2 is the alliance of the twin-stage Organic Rankine Cycle utilized based on afterheat of IC engine and LNG cold energy use of the invention
Power generation system structure schematic diagram；
Fig. 3 is that of the invention generated electricity based on Brayton cycle, twin-stage Organic Rankine Cycle and the alliance of LNG cold energy use is
System structural schematic diagram.
Specific embodiment
The present invention is described further with specific embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this hair
Bright each component or component structure relationship and the relative of determination, not refer in particular to either component or element in the present invention, cannot understand
For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " be shall be understood in a broad sense, and indicate may be a fixed connection,
It is also possible to be integrally connected or is detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the present invention as the case may be,
It is not considered as limiting the invention.
As background technique is introduced, the alliance circulation multi-form phase knots laid particular emphasis on heat source exist in the prior art more
It closes, although greatly improving the efficiency of energy utilization of system, the complexity of system is increased, to the efficient operation band of system
Great challenge is carried out, in order to solve technical problem as above, this application provides one kind based on twin-stage ORC and LNG cold energy benefit
Fuel cell alliance electricity generation system, by by existing SOFC system, Organic Rankine Cycle and LNG cold energy use system coupling
Close, change fuel battery negative pole and anode out temperature, air-fuel ratio, vapor carbon ratio and recycling than etc. to realize that function is cold
For.
As shown in Figure 1, a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use, including SOFC
System, twin-stage organic rankine cycle system and LNG cold energy use system；
The SOFC system is configured as that electrochemical reaction occurs by raw material of the mixture of air and fuel and water,
Externally output electric energy；
The SOFC system is configured as being used in conjunction with gas turbine (GT), the complete combustible gas of the unreacted of anode exhaust
Body and the excess air of cathode exhaust are admitted to gas turbine (GT) external expansion work after burning, and generate exhaust, the combustion
Gas-turbine exhaust is orderly used to preheated air, fuel and water, First Heat Exchanger (HE1) is then fed to, to drive twin-stage
Organic rankine cycle system；
The twin-stage organic rankine cycle system includes that first order organic rankine cycle system and second level organic Rankine follow
Loop system, the first order organic rankine cycle system are configured as, using LNG as cold source, adopting using combustion turbine exhaustion as heat source
It carries out Rankine cycle with first circulation working medium externally to do work, the second level organic rankine cycle system is configured as with first
The turbine lack of gas of grade organic rankine cycle system are heat source, using LNG as cold source, carry out Rankine cycle pair using second circulation working medium
Outer acting；Wherein, the driving heat source temperature of the first order Organic Rankine Cycle is higher than the driving of second level Organic Rankine Cycle
Heat source temperature；
The LNG cold energy use system is configured as being orderly used to cooling second circulation working medium, first circulation using LNG
Working medium and air, rear portion are used as the electrochemical reaction raw material of SOFC system, and a branch is for external expansion work recycling pressure
Power energy.
In the SOFC system, air is cold through the first air compressor (AC1) first compression, inter cooler (Cooler) LNG
SOFC operating pressure is boosted to after solidifying cooling and the second air compressor (AC2) second-compressed, then through the first preheater (PH1)
Sofc cathode is sent to after preheating.
In the SOFC system, fuel is delivered to mixer (M) after the second preheater (PH2) heating, and water is through the first pump
(P1) it is forced into SOFC operating pressure, mixer (M) is delivered to after third air preheater (PH3) heating, is mixed with fuel
After be sent to SOFC anode.
The excess air that the complete fuel gas of the unreacted of the SOFC anode discharge is discharged with sofc cathode is sent together
Enter afterburner (AB) to burn, generates high-temperature high-pressure fuel gas, it is external that the high-temperature high-pressure fuel gas is admitted to gas turbine (GT)
Expansion work.
The SOFC system external exports direct current, and it is defeated that the direct current through inverter (Inverter) is converted into alternating current
Out.
The first order organic rankine cycle system includes First Heat Exchanger (HE1), the first turbine for circuiting sequentially connection
(T1), the second heat exchanger (HE2), the first condenser (Con1) and the second pump (P2), the first circulation working medium saturated solution is through the
After two pump (P2) pressurizations and First Heat Exchanger (HE1) are heated into superheat state, the expansion work in the first turbine (T1) becomes
Flat lack of gas, after the turbine lack of gas discharge partial heat in the second heat exchanger (HE2), the quilt in the first condenser (Con1)
LNG is condensed into saturated solution, and then completes entire circulation.
The first circulation working medium includes but is not limited to toluene, benzene, nonane, octane, MDM and D4.
By taking toluene as an example, after the pump of toluene saturated solution second (P2) pressurization is heated into superheat state with First Heat Exchanger (HE1),
The expansion work in the first turbine (T1), becomes turbine lack of gas, and turbine lack of gas discharge partial heat in the second heat exchanger (HE2)
Afterwards, saturated solution is condensed by LNG in the first condenser (Con1), completes entire circulation.
The second level organic rankine cycle system includes the second heat exchanger (HE2), the second turbine for circuiting sequentially connection
(T2), the second condenser (Con2) and third pump (P3), the second circulation working medium saturated solution is through third pump (P3) pressurization and the
After two heat exchangers (HE2) are heated into superheat state, the expansion work in the second turbine (T2) becomes turbine lack of gas, the turbine
Lack of gas are condensed into saturated solution by LNG in the second condenser (Con2), and then complete entire circulation.
The second circulation working medium includes but is not limited to R600, R245fa, R123, R142b, R236ea and R600a.
The LNG cold energy use system includes sequentially connected LNG storage tank ((LNG Tank), the 4th pump (P4), second
Condenser (Con2), the first condenser (Con1), inter cooler (Cooler) and third turbine (T3), the LNG is by the 4th pump
(P4) after being forced into SOFC system running pressure, followed by the second condenser (Con2), the first condenser (Con1) and cold
Device (Cooler), rear part LNG is through third turbine (T3) external expansion work.
In specific implementation, the application establishes the thermodynamical model of co-feeding system, co-feeding system input ginseng based on EES software
Numerical value is as shown in table 1.According to the thermodynamical model of foundation and the physical parameter of working medium, the thermodynamics of each state of system is calculated
Parameter value, as shown in table 2 and table 3.The performance calculated result of the novel co-feeding system is as shown in table 4, and calculated result shows setting
It counts under operating condition, proposed co-feeding system generating efficiency is 72.27%,Efficiency is 55.2%.First order ORC efficiency is
20.57%, second level ORC efficiency is 20.64%.
1 co-feeding system of table inputs parameter
The calculated result of 2 SOFC system each point of table
3 bottoming cycle each point thermodynamic parameter of table
4 co-feeding system performance parameter of table
In addition to this, the twin-stage organic rankine cycle system of this system can be used for recovered temperature range at 300 DEG C or more
High temperature heat source, such as exhaust heat of internal combustion engine, combustion turbine exhaustion waste heat etc., co-feeding system are designed such as Fig. 2 and Fig. 3 institute
Show there is good effect.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use, it is characterised in that: including SOFC
System, twin-stage organic rankine cycle system and LNG cold energy use system；
The SOFC system is configured as that electrochemical reaction occurs by raw material of the mixture of air and fuel and water, externally
Export electric energy；
The SOFC system, is configured as being used in conjunction with gas turbine, the unreacted of anode exhaust complete fuel gas and cathode
The excess air of discharge is admitted to the external expansion work of gas turbine after burning, and generates exhaust, the combustion turbine exhaustion quilt
It is orderly used to preheated air, fuel and water, is then fed to First Heat Exchanger, to drive twin-stage organic rankine cycle system；
The twin-stage organic rankine cycle system includes first order organic rankine cycle system and second level Organic Rankine Cycle system
System, the first order organic rankine cycle system is configured as using combustion turbine exhaustion as heat source, using LNG as cold source, using the
One cycle fluid carries out Rankine cycle and externally does work, and the second level organic rankine cycle system is configured as having with the first order
The turbine lack of gas of machine Rankine cycle system are heat source, using LNG as cold source, carry out Rankine cycle using second circulation working medium and externally do
Function；Wherein, the driving heat source temperature of the first order Organic Rankine Cycle is higher than the driving heat source of second level Organic Rankine Cycle
Temperature；
The LNG cold energy use system is configured as being orderly used to cooling second circulation working medium, first circulation working medium using LNG
And air, rear portion are used as the electrochemical reaction raw material of SOFC system, a branch is used for external expansion work pressure recovery energy.
2. a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use as described in claim 1, institute
It states in SOFC system, air is through the first air compressor first compression, inter cooler LNG condensation cooling and the second air compressor two
SOFC operating pressure is boosted to after second compression, is then sent to sofc cathode after the preheating of the first preheater.
3. a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use as described in claim 1, institute
It states in SOFC system, fuel is delivered to mixer after the heating of the second preheater, and water is forced into SOFC operating pressure through the first pump,
It is delivered to mixer after the heating of third air preheater, SOFC anode is sent to after mixing with fuel.
4. a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use as described in claim 1, institute
The excess air of the complete fuel gas of unreacted and sofc cathode discharge of stating the discharge of SOFC anode be fed together afterburner into
Row burning, generates high-temperature high-pressure fuel gas, and the high-temperature high-pressure fuel gas is admitted to the external expansion work of gas turbine.
5. a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use as described in claim 1, institute
SOFC system external output direct current is stated, the direct current is converted into exchange electricity output through inverter.
6. a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use as described in claim 1, institute
Stating first order organic rankine cycle system includes the First Heat Exchanger for circuiting sequentially connection, the first turbine, the second heat exchanger, first
Condenser and the second pump, the first circulation working medium saturated solution are heated into superheat state through the second pump pressurization and First Heat Exchanger
Afterwards, the expansion work in the first turbine, becomes turbine lack of gas, and the turbine lack of gas discharge partial heat in the second heat exchanger
Afterwards, saturated solution is condensed by LNG in the first condenser, and then completes entire circulation.
7. a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use as described in claim 1, institute
Stating first circulation working medium includes but is not limited to toluene, benzene, nonane, octane, MDM and D4.
8. a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use as described in claim 1, institute
Stating second level organic rankine cycle system includes the second heat exchanger for circuiting sequentially connection, the second turbine, the second condenser and
Three pumps, the second circulation working medium saturated solution is after the pressurization of third pump and the second heat exchanger are heated into superheat state, thoroughly second
Expansion work in flat, becomes turbine lack of gas, the turbine lack of gas are condensed into saturated solution by LNG in the second condenser, and then complete
At entire circulation.
9. a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use as described in claim 1, institute
Stating second circulation working medium includes but is not limited to R600, R245fa, R123, R142b, R236ea and R600a.
10. a kind of fuel cell alliance electricity generation system based on twin-stage ORC and LNG cold energy use as described in claim 1, institute
Stating LNG cold energy use system includes sequentially connected LNG storage tank, the 4th pump, the second condenser, the first condenser, inter cooler
With third turbine, after the LNG is forced into SOFC system running pressure by the 4th pump, followed by the second condenser, first cold
Condenser and inter cooler, rear part LNG is through the external expansion work of third turbine.
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