CN106837438A - A kind of pressure energy of natural gas and cold energy combined recovery system of automobile and method - Google Patents
A kind of pressure energy of natural gas and cold energy combined recovery system of automobile and method Download PDFInfo
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- CN106837438A CN106837438A CN201710052199.6A CN201710052199A CN106837438A CN 106837438 A CN106837438 A CN 106837438A CN 201710052199 A CN201710052199 A CN 201710052199A CN 106837438 A CN106837438 A CN 106837438A
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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
- 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
- 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
-
- 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
- F01K25/10—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 the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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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
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
The invention discloses a kind of pressure energy of natural gas and cold energy combined recovery system of automobile and method.The system includes that pressure energy of natural gas reclaims subsystem, supercritical CO2Power generation sub-system and gas turbine power generation cycle subsystem：The pressure energy of natural gas reclaims subsystem and the first natural gas is carried out into multiple expansion, externally generates electricity.The supercritical CO2Power generation sub-system reclaims the natural gas heat release after subsystem expands to through the pressure energy of natural gas, while absorbed heat from the smoke evacuation of the gas turbine power generation cycle subsystem, by supercritical CO2Working medium closed cycle generates electricity.The gas turbine power generation cycle subsystem reclaims the natural gas of part second of subsystem output as fuel with the pressure energy of natural gas, and by discharging fume to the supercritical CO2Power generation sub-system heat release, carries out gas turbine power generation.Cold energy is wasted during system and method for the invention can overcome in existing gas exploitation course pressure energy restriction loss and expansion process, improves energy utilization rate.
Description
Technical field
The present invention relates to pressure energy of natural gas recycling field, more particularly to a kind of pressure energy of natural gas and cold energy combined recovery
System and method.
Background technology
Throttling arrangement often is installed in well head or pit shaft in gas exploitation course, by gas well natural gas pressure reducing pressure by regulating flow
To gas gathering line pressure, be then further depressured by pressure regulation distribution station again, finally reach it is actual transport pressure, be shipped for using
Family." reducing pressure by regulating flow " measure is generally used in natural pressure reduction at present, on the one hand this mode causes substantial amounts of natural pressure
Power can be wasted in pressure reduction；The natural gas of another aspect normal temperature high voltage temperature in expansion process can be drastically reduced, mistake
Low temperature can produce serious influence to pipeline and equipment, and traditional mode is to utilize air heat exchanger heat exchange, due to air
Specific heat is small, and air heat exchanger volume is big, high cost.For the pressure energy in natural gas pressure reduction, can be by multistage turbine
Expansion power generator is reclaimed；The cold energy produced after natural gas expansion can be as carbon dioxide CO2Power generation cycle thermodynamic cycle
Cold end, improve circulating generation efficiency.
The content of the invention
(1) technical problem to be solved
In order to overcome cold energy during pressure energy restriction loss and expansion are reclaimed in existing gas exploitation course to waste
Deficiency, the invention provides a kind of pressure energy of natural gas and cold energy combined recovery system of automobile and method.
(2) technical scheme
Technical scheme is as follows：
Son is reclaimed the invention provides a kind of pressure energy of natural gas and cold energy combined recovery system of automobile, including pressure energy of natural gas
System, supercritical CO2Power generation sub-system and gas turbine power generation cycle subsystem：The pressure energy of natural gas reclaims subsystem will
First natural gas carries out multiple expansion, externally generates electricity, and to the second natural gas after output pressure reduction outside system；Through the day
Caloric receptivity needed for right atmospheric pressure can reclaim the natural gas after subsystem expansion comes from the supercritical CO2Power generation sub-system is put
Heat.The supercritical CO2Power generation sub-system reclaims the natural gas heat release after subsystem expands to through the pressure energy of natural gas,
Absorbed heat from the smoke evacuation of the gas turbine power generation cycle subsystem simultaneously, by supercritical CO2Working medium closed cycle generates electricity.It is described
Gas turbine power generation cycle subsystem reclaims the natural gas of part second of subsystem output as fuel with the pressure energy of natural gas,
And by discharging fume to the supercritical CO2Power generation sub-system heat release, carries out gas turbine power generation.
The pressure energy of natural gas reclaim subsystem include high-pressure turbine expanding machine, the first generator, high pressure heat exchanger, in
Pressure turbo-expander, middle pressure heat exchanger, low-pressure turbine expanding machine, the second generator and low pressure heat exchanger；The high-pressure turbine is swollen
The arrival end of swollen machine introduces first natural gas；The port of export of the high-pressure turbine expanding machine, the heat absorbing side of high pressure heat exchanger,
Middle pressure turbine expanding machine, the heat absorbing side, low-pressure turbine expanding machine and low pressure heat exchanger of middle pressure heat exchanger heat absorbing side arrival end according to
It is secondary to be connected by pipeline；The heat absorbing side port of export of the low pressure heat exchanger exports the second natural gas；First generator and height
Pressure turbo-expander is coaxial；Second generator is coaxial with middle pressure turbine expanding machine and low-pressure turbine expanding machine；Through the day
Right atmospheric pressure can reclaim suction of the natural gas after subsystem expansion from the heat absorbing side, medium pressure heat exchanger of the high pressure heat exchanger
The heat absorbing side of hot side and the low pressure heat exchanger absorbs from the supercritical CO successively2The thermal discharge of power generation sub-system.
The supercritical CO2Power generation sub-system includes high pressure heat exchanger, middle pressure heat exchanger, low pressure heat exchanger, CO2Generator,
Regulating valve, CO2Expanding machine, CO2Compressor, flue gas-supercritical CO2Heat exchanger.The CO2The port of export of compressor, flue gas-super
Critical CO2The heat absorbing side of heat exchanger, CO2Expanding machine, the cold side of high pressure heat exchanger, the cold side of middle pressure heat exchanger, low pressure heat exchange
The cold side arrival end of device passes sequentially through pipeline connection, and the port of export of the cold side of the low pressure heat exchanger and the CO2
The arrival end of compressor is connected by pipeline, constitutes supercritical CO2Closed cycle.The CO2Generator and CO2Expanding machine and CO2
Compressor is coaxial；The regulating valve is by pipe arrangement in CO2Between the port of export of expanding machine and the arrival end of high pressure heat exchanger；
The regulating valve is used to adjust the supercritical CO of the cold side for entering high pressure heat exchanger2Flow.The supercritical CO2Generate electricity son
System is by cold side, the cold side of middle pressure heat exchanger, the cold side of low pressure heat exchanger of the high pressure heat exchanger successively to warp
The pressure energy of natural gas reclaims the natural gas release heat after subsystem expansion；Meanwhile, the supercritical CO2Power generation sub-system
By the flue gas-supercritical CO2The heat absorbing side of heat exchanger is absorbed heat from the smoke evacuation of the gas turbine power generation cycle subsystem.
The gas turbine power generation cycle subsystem include control valve, flue gas-heat exchange gas device, combustion chamber, compressor,
Turbine, gas electricity generator, regenerator, flue gas-supercritical CO2Heat exchanger.The arrival end of the control valve introduces the natural gas
Pressure energy reclaims the natural gas of part second of subsystem output；The port of export connection flue gas-heat exchange gas device of the control valve
Heat absorption side entrance；The heat absorbing side port of export of the flue gas-heat exchange gas device is connected to the fuel inlet of combustion chamber by pipeline
End.The arrival end of the compressor introduces air；The port of export of the compressor, the cold side of regenerator, the gas of combustion chamber
Entrance end, turbine, the heat absorbing side of regenerator, flue gas-supercritical CO2The cold side of heat exchanger, flue gas-heat exchange gas device
Cold side arrival end passes sequentially through pipeline connection；The gas electricity generator is coaxial with turbine, compressor.The gas turbine power generation
The smoke evacuation of cycle subsystem passes through the flue gas-supercritical CO2The lateral supercritical CO of the heat release of heat exchanger2Power generation sub-system
Heat release.
Present invention also offers a kind of pressure energy of natural gas and the method for cold energy combined recovery, including：
S1, pressure energy of natural gas are reclaimed after the first natural gas is carried out multiple expansion by subsystem and dropped to output pressure outside system
The second natural gas after low, while externally generate electricity, so as to realize the recovery of the pressure energy to first natural gas；
S2, the supercritical CO2Power generation sub-system reclaims natural after subsystem expands to through the pressure energy of natural gas
Gas heat release, and absorbed heat from the smoke evacuation of the gas turbine power generation cycle subsystem, realize supercritical CO2Working medium closed cycle is right
Outer generating, so as to realize the recovery to first natural gas cold energy；
S3, the gas turbine power generation cycle subsystem carry out gas turbine with part second natural gas as fuel
Generate electricity；And by discharging fume to the supercritical CO2Power generation sub-system heat release.
The pressure energy of natural gas of step S1 reclaims subsystem includes high-pressure turbine expanding machine, the first generator, high pressure heat exchange
Device, middle pressure turbine expanding machine, middle pressure heat exchanger, low-pressure turbine expanding machine, the second generator and low pressure heat exchanger.Step S1 bags
Include：The arrival end of the high-pressure turbine expanding machine introduces first natural gas；First natural gas sequentially passes through the high pressure whirlpool
Wheel expanding machine once expand, once absorbed heat from high pressure heat exchanger, in the reexpansion of middle pressure turbine expanding machine, therefrom press heat exchanger two
Secondary heat absorption, in the triple-expansion of low-pressure turbine expanding machine and from after the heat absorption of low pressure heat exchanger three times, be converted to the second natural gas and defeated
Go out to outside system；First natural gas drives first generator while high-pressure turbine expanding machine once expands
Rotate, externally generate electricity；First natural gas reexpansion and in low-pressure turbine expanding machine in medium pressure turbo-expander
While triple-expansion, drive second generator to rotate, externally generate electricity；It is swollen subsystem to be reclaimed through the pressure energy of natural gas
Natural gas after swollen exchanges heat from once heat absorption, the secondary heat absorption of medium pressure heat exchanger and the low pressure of the high pressure heat exchanger
The heat of three heat absorptions of device is all from the supercritical CO2The heat release of power generation sub-system.
The supercritical CO of step S22Power generation sub-system includes high pressure heat exchanger, middle pressure heat exchanger, low pressure heat exchanger, CO2Hair
Motor, regulating valve, CO2Expanding machine, CO2Compressor, flue gas-supercritical CO2Heat exchanger.Step S2 includes：CO2Compressor is introduced
Supercritical CO2Working medium；The supercritical CO2Working medium sequentially passes through the CO2Compressor is compressed, from flue gas-supercritical CO2
Heat exchanger heat absorption, in CO2Expansion in expanding machine, to heat release of high pressure heat exchanger, again to the heat exchanger secondary heat release of middle pressure, to low
Pressure three heat releases of heat exchanger, are finally returned to CO2It is circulated in compressor；The supercritical CO2Working medium is in CO2In expanding machine
The CO is driven while expansion2Generator is rotated, and is externally generated electricity.
The gas turbine power generation cycle subsystem of step S3 includes control valve, flue gas-heat exchange gas device, combustion chamber, pressure
Mechanism of qi, turbine, gas electricity generator, regenerator, flue gas-supercritical CO2Heat exchange.Step S3 includes：The control valve is by described the
Two natural gases introduce gas turbine power generation cycle subsystem；Second natural gas passes through in flue gas-heat exchange gas device heat absorption
Enter combustion chamber afterwards.The compressor introduces air；The air enters through the compression of the compressor, after regenerator heat absorption
Combustion chamber forms flue gas with natural gas mixing after-combustion.The flue gas enter turbine expansion after discharge turn into smoke evacuation, and successively to
Heat release of regenerator, to flue gas-supercritical CO2The secondary heat release of heat exchanger, to flue gas-heat release of heat exchange gas device three times.Institute
State and driven while flue gas expands in turbine compressor and gas electricity generator rotation；The gas electricity generator externally generates electricity.Institute
The heat of secondary heat release of discharging fume is stated by the supercritical CO2Power generation sub-system absorbs.
(3) beneficial effect
1st, the present invention is provided pressure energy of natural gas and cold energy combined recovery system of automobile and method, can simultaneously reclaim natural gas swollen
The cold energy after pressure energy and expansion during swollen, it is not necessary to build extra accessory system to reclaim the energy of multi-form
Amount.
2nd, the present invention is provided pressure energy of natural gas and cold energy combined recovery system of automobile and method, are followed using gas turbine power generation
Loop subsystems and waste heat supercritical CO2The Closed Brayton Power Cycle power generation cycle of power generation sub-system, system overall volume is small, opens
It is dynamic fast.
3rd, the present invention is provided pressure energy of natural gas and cold energy combined recovery system of automobile and method, using supercritical CO2Working medium
With the cryogenic natural gas heat exchange after expansion, CO2Working medium specific heat ratio air is big, therefore required heat exchanger volume is small, initial to throw
Money is few.
4th, the present invention is provided pressure energy of natural gas and cold energy combined recovery system of automobile and method, the form of energy of final output
All it is electric energy, the consolidated delivery for recovering energy can be realized.
5th, the present invention is provided pressure energy of natural gas and cold energy combined recovery system of automobile and method, intercycle is using overcritical
CO2Closed Brayton Power Cycle, using the cryogenic natural gas after expansion as the low temperature side of intercycle, it is possible to increase intercycle
Generating efficiency.
Brief description of the drawings
Fig. 1 is the pressure energy of natural gas of one embodiment of the invention and the schematic diagram of cold energy combined recovery system of automobile；
Fig. 2 is the pressure energy of natural gas and cold energy combined reclamation method flow chart of one embodiment of the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in further detail.
As shown in figure 1, Fig. 1 is the pressure energy of natural gas and cold energy combined recovery system of automobile schematic diagram of an embodiment, this is natural
Atmospheric pressure energy and cold energy combined recovery system of automobile include that pressure energy of natural gas reclaims subsystem 100, supercritical CO2Power generation sub-system
200 and gas turbine power generation cycle subsystem 300.
Pressure energy of natural gas reclaim subsystem 100 first natural gas is carried out into multiple expansion, externally generate electricity, and to system outside
The second natural gas after output pressure reduction.Suction needed for reclaiming the natural gas after subsystem 100 expands through pressure energy of natural gas
Heat comes from supercritical CO2The thermal discharge of power generation sub-system 200.
Supercritical CO2Power generation sub-system 200 is put to the natural gas after reclaiming the expansion of subsystem 100 through pressure energy of natural gas
Heat, while absorbed heat from the smoke evacuation of gas turbine power generation cycle subsystem 300, by supercritical CO2Working medium closed cycle generates electricity.
Gas turbine power generation cycle subsystem 300 reclaims the part second day that subsystem 100 is exported with pressure energy of natural gas
Right gas is fuel, and by discharging fume to supercritical CO2The heat release of power generation sub-system 200, carries out gas turbine power generation.
The first natural gas in the present embodiment include but is not limited to from exploitation well head obtain with the natural of elevated pressures
Gas.The pressure energy of natural gas and cold energy combined recovery system of automobile of the present embodiment reclaim subsystem 100, surpass by by pressure energy of natural gas
Critical CO2Power generation sub-system 200 and gas turbine power generation cycle subsystem 300 combine, make well head exploit with certain
First natural gas expansion work of pressure energy, externally generates electricity, and realizes the recovery of the pressure energy to the first natural gas.Meanwhile, this
Embodiment system reclaims the relatively low natural gas of the temperature after subsystem 100 expands as supercritical CO using pressure energy of natural gas2Hair
The low-temperature receiver of electronic system 200, and using the smoke evacuation of the high temperature of gas turbine power generation cycle subsystem 300 as supercritical CO2Generate electricity
The thermal source of subsystem 200, by supercritical CO2Working medium closed cycle generates electricity, and effectively realizes cold after the expansion of the first natural gas
The recovery of energy, the energy of multi-form is reclaimed without the need for extra accessory system is built.
The pressure energy of natural gas of one embodiment reclaims subsystem 100 includes high-pressure turbine expanding machine 1, the first generator 2, height
Pressure heat exchanger 3, middle pressure turbine expanding machine 4, middle pressure heat exchanger 5, low-pressure turbine expanding machine 6, the second generator 7 and low pressure heat exchanger
8.The arrival end of high-pressure turbine expanding machine 1 introduces the first natural gas.The port of export of high-pressure turbine expanding machine 1, high pressure heat exchanger 3
Heat absorbing side, middle pressure turbine expanding machine 4, the heat absorption of the heat absorbing side, low-pressure turbine expanding machine 6 and low pressure heat exchanger 8 of middle pressure heat exchanger 5
Side entrance end passes sequentially through pipeline connection.First generator 2 is coaxial with high-pressure turbine expanding machine 1.Second generator 7 and middle pressure whirlpool
Wheel expanding machine 4 and low-pressure turbine expanding machine 6 are coaxial.The natural gas after subsystem 100 expands from height is reclaimed through pressure energy of natural gas
Heat absorbing side, the heat absorbing side of middle pressure heat exchanger 5 and the heat absorbing side of low pressure heat exchanger 8 of heat exchanger 3 is pressed to absorb successively from overcritical
CO2The thermal discharge of power generation sub-system 200.
When the pressure energy of natural gas of one embodiment reclaims the work of subsystem 100, the first natural gas that natural gas well head is produced
High-pressure turbine expanding machine 1 is initially entered, and is once expanded in high-pressure turbine expanding machine 1, drive high-pressure turbine expanding machine 1
Axle rotate, while drive the first generator 2 axle rotate so as to generate electricity.Natural high pressure is entered by pipeline after once expanding
Heat exchanger 3 is once absorbed heat, and heat absorption is warming up into after the temperature requirement of middle-pressure turbine 4, and whirlpool is pressed in entering by pipeline
Wheel expanding machine 4 carries out reexpansion acting.Natural gas after reexpansion therefrom presses the secondary heat absorption of heat exchanger 5 by pipeline,
After heat absorption is warming up to the temperature requirement of low-pressure turbine 6, by pipeline to the expansion work of low-pressure turbine expanding machine 6.Finally low
Three heat absorptions are carried out in pressure heat exchanger 8, heat absorption intensification enters into conveying pipe after reaching normal temperature.Natural gas expands in middle pressure turbine
Expansion work in machine 4 and low-pressure turbine expanding machine 6, promotes the axle of middle pressure turbine expanding machine 4 and low-pressure turbine expanding machine 6 to rotate,
The second coaxial generator 7 is driven to rotate, so as to generate electricity.
The pressure energy of natural gas of the present embodiment reclaim subsystem 100 by by natural gas well head with certain pressure can
Natural gas is generated electricity by multiple expansion, realizes the effective recycling of pressure energy of natural gas.
The supercritical CO of one embodiment2Power generation sub-system 200 includes high pressure heat exchanger 3, middle pressure heat exchanger 5, low pressure heat exchange
Device 8, CO2Generator 9, regulating valve 10, CO2Expanding machine 11, CO2Compressor 12, flue gas-CO2Heat exchanger 13.It is overcritical in pipeline
CO2(7.5MPa, 35 DEG C) working medium.Wherein, CO2The port of export of compressor 12, flue gas-CO2The heat absorbing side of heat exchanger 13, CO2It is swollen
Swollen machine 11, the cold side of high pressure heat exchanger 3, the cold side of middle pressure heat exchanger 5, low pressure heat exchanger 8 cold side arrival end successively
By pipeline connect, and the cold side of low pressure heat exchanger 8 the port of export and CO2The arrival end of compressor 12 is connected by pipeline,
Constitute supercritical CO2Closed cycle.CO2Generator 9 and CO2Expanding machine 11 and CO2Compressor 12 is coaxial.Regulating valve 10 is by pipe
Road is arranged in CO2Between the port of export of expanding machine 11 and the arrival end of high pressure heat exchanger 3.Regulating valve 10 enters high pressure for regulation
The supercritical CO of the cold side of heat exchanger 32Flow.Supercritical CO2The heat release that power generation sub-system 200 passes through high pressure heat exchanger 3
Side, the cold side of middle pressure heat exchanger 5, the cold side of low pressure heat exchanger 8 are successively to swollen through pressure energy of natural gas recovery subsystem 100
Natural gas release heat after swollen.Meanwhile, supercritical CO2Power generation sub-system 200 passes through flue gas-supercritical CO2The suction of heat exchanger 13
Hot side is absorbed heat from the smoke evacuation of gas turbine power generation cycle subsystem 300.
The supercritical CO of one embodiment2Power generation sub-system 200 work when, original state (7.5MPa, 35 DEG C) it is overcritical
CO2Working medium enters CO2It is compressed in compressor 12, pressure and temperature is raised, then into flue gas-CO2Inhaled in heat exchanger 13
Receive heat.Supercritical CO2Working medium is in flue gas-CO2After absorbing heat in heat exchanger 13, temperature is further raised, and enters into CO2It is swollen
Expansion work is carried out in swollen machine 11.CO2A work(part for the output of expanding machine 11 overcomes CO2The wasted work of compressor 12 a, part drives
CO2Generator 9 generates electricity.CO after expansion2Temperature of Working and pressure reduction, remain at superheat state, then into high pressure
Cold side in heat exchanger 3 carries out a heat release.CO2Working medium is again successively to 5 two heat releases of middle pressure heat exchanger, low pressure heat exchanger 8
Cold side carry out three heat releases, then CO2Working medium becomes original state (7.5MPa, 35 DEG C) again.
The supercritical CO of the present embodiment2Regulating valve 10 in power generation sub-system 200 can control to enter high pressure heat exchanger 3
The CO of the cold side of the cold side and low pressure heat exchanger 8 of cold side and middle pressure heat exchanger 52Working medium mass flow, so as to adjust
CO2Thermal discharge of the working medium in above-mentioned 3 heat exchangers.
The high pressure heat exchanger 3 of the present embodiment, middle pressure heat exchanger 5, low pressure heat exchanger 8 are natural gas-supercritical COs2Heat exchange
Device.Wherein, the heat absorbing side working medium of above three heat exchanger is the relatively low natural gas of temperature after expansion, and cold side working medium is critical
CO2.Due to CO2Working medium specific heat ratio air is big, therefore volume needed for above three heat exchanger is than natural gas-sky for commonly using
Gas heat exchanger is small, so as to reduce initial outlay.
The pressure energy of natural gas and cold energy combined recovery system of automobile of the present embodiment pass through supercritical CO2Power generation sub-system 200, profit
Use supercritical CO2Working medium exchanges heat with the cryogenic natural gas after expansion, using the natural gas after expansion as supercritical CO2What is circulated is low
Warm low-temperature receiver, reclaims the cold energy after the expansion of the first natural gas, improves supercritical CO2Cycle efficieny, and need not build extra
Accessory system reclaim the energy of multi-form.
The gas turbine power generation cycle subsystem 300 of one embodiment include control valve 14, flue gas-heat exchange gas device 15,
Combustion chamber 16, compressor 17, turbine 18, CO2Generator 19, regenerator 20 and flue gas-CO2Heat exchanger 13.Wherein, valve 14 is controlled
Arrival end introduce pressure energy of natural gas reclaim subsystem 100 output the second natural gas.Control the port of export connection cigarette of valve 14
Gas-the heat absorption of heat exchange gas device 15 side entrance.The heat absorbing side port of export of flue gas-heat exchange gas device 15 is connected to combustion by pipeline
Burn the fuel inlet end of room 16.The arrival end of compressor 17 introduces air.The port of export of compressor 17, the heat release of regenerator 20
Side, the gas inlet and outlet end of combustion chamber 16, turbine 18, the heat absorbing side of regenerator 20, flue gas-CO2The cold side of heat exchanger 13, cigarette
The cold side arrival end of gas-heat exchange gas device 15 passes sequentially through pipeline connection.Gas electricity generator 19 and turbine 18, compressor 17
Coaxially.The smoke evacuation of gas turbine power generation cycle subsystem 300 passes through flue gas-supercritical CO2The heat release of heat exchanger 13 is laterally super to face
Boundary CO2The heat release of power generation sub-system 200.
When the gas turbine power generation cycle subsystem 300 of one embodiment works, entrance of second natural gas from control valve 14
The heat absorbing side of flue gas-heat exchange gas device 15 is absorbed heat, and temperature enters burning after raising from the fuel inlet end of combustion chamber 16
Room, is that gas turbine power generation cycle subsystem 300 provides fuel.Air compresses into compressor 17, is then entered by pipeline
The heat absorbing side heat absorption of regenerator 20, then enters combustion chamber 16 by pipeline from the gas inlet end of combustion chamber 16, is into combustion
The second natural gas mixing of room 16 is burnt, for the burning of the second natural gas provides oxygen.Air and second inside combustion chamber 16 is natural
Gas mixing after-combustion turns into the flue gas of high temperature.Then, high-temperature flue gas enter into expansion work in turbine 18, drive the axle of turbine 18
Rotate, so as to drive coaxial gas electricity generator 19 to generate electricity.Turn into smoke evacuation by the flue gas discharge after turbine expansion.Next,
The cold side that smoke evacuation is introduced into regenerator 20 carries out a heat release, then enters back into flue gas-CO2The cold side two of heat exchanger 13
Secondary heat release, entering finally into the cold side of flue gas-heat exchange gas device 15 carries out three heat releases.
Control valve 14 in the present embodiment can control to introduce the second gas discharge of combustion chamber 16, flue gas-CO2Heat exchange
The cold side working medium of device 13 is flue gas, and heat absorbing side working medium is supercritical CO2.The cold side working medium of flue gas-heat exchange gas device 15
It is flue gas, heat absorbing side working medium is the second natural gas.The recovered flue gas one in regenerator 20 of gas turbine power generation cycle subsystem 300
The heat of secondary heat release enters the air themperature of combustion chamber 16 to improve.Smoke evacuation three times is reclaimed in flue gas-heat exchange gas device 15
The heat of heat release enters the second natural gas temperature of combustion chamber 16 to improve.So that eventually entering into the air of combustion chamber 16
Raised with the second natural gas temperature, improve the efficiency of combustion of combustion chamber 16.
Fig. 2 is the pressure energy of natural gas and cold energy combined reclamation method flow chart of one embodiment of the invention, including following step
Suddenly：
S1, pressure energy of natural gas are reclaimed after the first natural gas is carried out multiple expansion by subsystem 100 and pressed to output outside system
The second natural gas after power reduction, while externally generate electricity, so as to realize the recovery of the pressure energy to the first natural gas.
S2, supercritical CO2Power generation sub-system 200 reclaims the natural gas after subsystem 100 expands to through pressure energy of natural gas
Heat release, and absorbed heat from the smoke evacuation of gas turbine power generation cycle subsystem 300, realize supercritical CO2Working medium closed cycle, to outgoing
Electricity, so as to realize the recovery to the first natural gas cold energy.
S3, gas turbine power generation cycle subsystem 300 carry out gas turbine power generation with the natural gas of part second as fuel,
And by discharging fume to supercritical CO2The heat release of power generation sub-system 200.
Wherein, the supercritical CO of the present embodiment2Power generation sub-system 200 is to swollen through pressure energy of natural gas recovery subsystem 100
The CO of the natural gas heat release after swollen2Working medium is supercritical CO2The CO entered in power generation sub-system 2002CO before compressor2Working medium.
Which decrease CO2Working medium enters CO2Inlet temperature during compressor, can effectively mention CO2The efficiency of compressor, fully
Using the cold energy of the natural gas after expansion.
The supercritical CO of the present embodiment2Power generation sub-system 200 is inhaled from the smoke evacuation of gas turbine power generation cycle subsystem 300
Heat, is by supercritical CO2Enter CO in power generation sub-system 2002CO before expanding machine2Working medium circulates subsystem from gas turbine power generation
On the one hand the smoke evacuation heat absorption of system 300, can so improve and enter CO2The CO of expanding machine2Temperature of Working, effectively improves CO2Expansion
The efficiency of machine, while the smoke exhaust heat of gas turbine power generation cycle subsystem 300 can be made full use of, reclaims used heat.
It is as follows that the pressure energy of natural gas of one embodiment and the method for cold energy combined recovery implement process：
Step S1 includes：The arrival end of high-pressure turbine expanding machine 1 introduces the first natural gas.First natural gas sequentially passes through height
Pressure turbo-expander 1 once expand, from high pressure heat exchanger 3 once absorb heat, in the reexpansion of middle pressure turbine expanding machine 4, therefrom
Secondary heat absorption in pressure heat exchanger 5, in the triple-expansion of low-pressure turbine expanding machine 6 and from low pressure heat exchanger 8 after three heat absorptions, conversion
Outside for the second natural gas and output to system.First natural gas drives first while high-pressure turbine expanding machine 1 once expands
Generator 2 is rotated, and is externally generated electricity.The reexpansion and in low-pressure turbine expanding machine 6 in middle pressure turbine expanding machine 4 of first natural gas
While triple-expansion, drive the second generator 7 to rotate, externally generate electricity.After the expansion of subsystem 100 being reclaimed through pressure energy of natural gas
Natural gas from the once heat absorption of high pressure heat exchanger 3, the secondary heat absorption and three times of low pressure heat exchanger 8 heat absorptions of middle pressure heat exchanger 5
Heat be all from supercritical CO2The heat release of power generation sub-system 200.
Step S2 includes：CO2Compressor 12 introduces supercritical CO2Working medium.Supercritical CO2Working medium sequentially passes through CO2Compressor
Be compressed, from flue gas-supercritical CO2Heat exchanger 13 absorbs heat, in CO2In expanding machine 11 expansion, to the heat release one of high pressure heat exchanger 3
Secondary heat release, to heat exchanger 5 two heat releases of middle pressure, to 8 three heat releases of low pressure heat exchanger after, be returned to CO2Carried out in compressor 12
Circulation.Supercritical CO2Working medium is in CO2CO is driven while expansion in expanding machine 112Generator 9 is rotated, and is externally generated electricity.
Step S3 includes：Control valve 14 introduces the second natural gas.Second natural gas passes through in flue gas-heat exchange gas device 15
Enter combustion chamber 16 after heat absorption.Compressor 17 introduces air.Air enters through the compression of compressor 17, after the heat absorption of regenerator 20
Combustion chamber 16 and the natural gas mixing after-combustion for entering combustion chamber (16), produce flue gas.Flue gas sequentially enter turbine 18 expand, to
20 heat releases of regenerator, to flue gas-supercritical CO213 2 heat releases of heat exchanger, put to flue gas-heat exchange gas device 15 3 times
Heat.Compressor 17 and gas electricity generator 19 is driven to rotate while flue gas expands in turbine 18.Gas electricity generator 19 is to outgoing
Electricity.Discharge fume secondary heat release heat by supercritical CO2Power generation sub-system 200 absorbs.
In the pressure energy of natural gas and cold energy combined recovery system of automobile and method of the present embodiment, gas turbine power generation circulation subsystem
System 300 and supercritical CO2Power generation sub-system 200 shares flue gas-CO2Heat exchanger 13 so that supercritical CO2Power generation sub-system 200 is led to
Cross flue gas-CO2Heat exchanger 13 absorbs heat from the smoke evacuation of gas turbine power generation cycle subsystem 300.Wherein, gas turbine power generation circulation
The smoke evacuation of subsystem 300 is in flue gas-CO2Three heat releases of heat exchanger 13, while supercritical CO2The CO of power generation sub-system2Working medium exists
13 heat absorbing side absorbs three heats of heat release of smoke evacuation, takes full advantage of the smoke evacuation heat of gas turbine power generation cycle subsystem 300
Amount, reduces supercritical CO2External heat source needed for power generation sub-system, improves energy whole utilization efficiency.
The present embodiment combination gas turbine power generation circulation, waste heat supercritical CO2Power generation cycle and natural gas expansion power generation
Circulation composition pressure energy of natural gas and cold energy combined recovery system of automobile, pressure energy of natural gas is reclaimed using multistage turbine expansion power generation,
Pass through gas turbine-supercritical CO simultaneously2Generating combined cycle reclaims natural gas expansion cold energy, is capable of achieving natural gas gas production process
In pressure energy and recycle while cold energy, reduce the waste of the energy.
Particular embodiments described above, has been carried out further in detail to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail bright, it should be understood that the foregoing is only specific embodiment of the invention, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc. should be included in protection of the invention
Within the scope of.
Claims (8)
1. a kind of pressure energy of natural gas and cold energy combined recovery system of automobile, it is characterised in that reclaim subsystem including pressure energy of natural gas
System (100), supercritical CO2Power generation sub-system (200) and gas turbine power generation cycle subsystem (300)：
The pressure energy of natural gas reclaims subsystem (100) and the first natural gas is carried out into multiple expansion, externally generates electricity, and to system
The second natural gas after outer output pressure reduction；The natural gas after subsystem (100) expands is reclaimed through the pressure energy of natural gas
Required caloric receptivity comes from the supercritical CO2The thermal discharge of power generation sub-system (200)；
The supercritical CO2Power generation sub-system (200) reclaims the day after subsystem (100) expands to through the pressure energy of natural gas
Right gas heat release, while absorbed heat from the smoke evacuation of the gas turbine power generation cycle subsystem (300), by supercritical CO2Working medium is closed
Formula circulating generation；
The gas turbine power generation cycle subsystem (300) reclaims the part second that subsystem is exported with the pressure energy of natural gas
Natural gas is fuel, and by discharging fume to the supercritical CO2Power generation sub-system (200) heat release, carries out gas turbine power generation.
2. pressure energy of natural gas according to claim 1 and cold energy combined recovery system of automobile, it is characterised in that：
The pressure energy of natural gas reclaims subsystem (100) and is changed including high-pressure turbine expanding machine (1), the first generator (2), high pressure
Hot device (3), middle pressure turbine expanding machine (4), middle pressure heat exchanger (5), low-pressure turbine expanding machine (6), the second generator (7) and low pressure
Heat exchanger (8)；
The arrival end of the high-pressure turbine expanding machine (1) introduces first natural gas；High-pressure turbine expanding machine (1) goes out
Mouth end, the heat absorbing side of high pressure heat exchanger (3), middle pressure turbine expanding machine (4), the heat absorbing side of middle pressure heat exchanger (5), low-pressure turbine are swollen
The heat absorbing side arrival end of swollen machine (6) and low pressure heat exchanger (8) passes sequentially through pipeline connection；The heat absorption of the low pressure heat exchanger (8)
Side outlet end exports the second natural gas；
First generator (2) is coaxial with high-pressure turbine expanding machine (1)；Second generator (7) expands with middle pressure turbine
Machine (4) and low-pressure turbine expanding machine (6) are coaxial；
Heat absorption of the natural gas after subsystem (100) expands from the high pressure heat exchanger (3) is reclaimed through the pressure energy of natural gas
The heat absorbing side of side, the heat absorbing side of medium pressure heat exchanger (5) and the low pressure heat exchanger (8) absorbs from described overcritical successively
CO2The thermal discharge of power generation sub-system (200).
3. pressure energy of natural gas according to claim 1 and cold energy combined recovery system of automobile, it is characterised in that：
The supercritical CO2Power generation sub-system (200) including high pressure heat exchanger (3), it is middle pressure heat exchanger (5), low pressure heat exchanger (8),
CO2Generator (9), regulating valve (10), CO2Expanding machine (11), CO2Compressor (12), flue gas-supercritical CO2Heat exchanger (13)；
The CO2The port of export of compressor (12), flue gas-supercritical CO2Heat absorbing side, the CO of heat exchanger (13)2Expanding machine (11),
The cold side of high pressure heat exchanger (3), the cold side of middle pressure heat exchanger (5), the cold side arrival end of low pressure heat exchanger (8) lead to successively
Piping connect, and the cold side of the low pressure heat exchanger (8) the port of export and the CO2The arrival end of compressor (12) leads to
Piping is connected, and constitutes supercritical CO2Closed cycle；
The CO2Generator (9) and CO2Expanding machine (11) and CO2Compressor (12) is coaxial；The regulating valve (10) is by pipeline
It is arranged in CO2Between the port of export of expanding machine (11) and the arrival end of high pressure heat exchanger (3)；The regulating valve (10) is for adjusting
Into the supercritical CO of the cold side of high pressure heat exchanger (3)2Flow；
The supercritical CO2Power generation sub-system (200) is by the cold side of the high pressure heat exchanger (3), middle pressure heat exchanger (5)
Cold side, the cold side of low pressure heat exchanger (8) reclaim the day after subsystem (100) expands to through the pressure energy of natural gas successively
Right gas release heat；
Meanwhile, the supercritical CO2Power generation sub-system (200) is by the flue gas-supercritical CO2The heat absorbing side of heat exchanger (13)
Absorbed heat from the smoke evacuation of the gas turbine power generation cycle subsystem (300).
4. pressure energy of natural gas according to claim 1 and cold energy combined recovery system of automobile, it is characterised in that：
The gas turbine power generation cycle subsystem (300) includes control valve (14), flue gas-heat exchange gas device (15), burning
Room (16), compressor (17), turbine (18), gas electricity generator (19), regenerator (20), flue gas-supercritical CO2Heat exchanger
(13)；
The part of arrival end introducing pressure energy of natural gas recovery subsystem (100) output of control valve (14) second day
Right gas；The port of export connection flue gas of control valve (14)-heat exchange gas device (15) heat absorption side entrance；The flue gas-natural
The heat absorbing side port of export of gas heat exchanger (15) is connected to the fuel inlet end of combustion chamber (16) by pipeline；
The arrival end of the compressor (17) introduces air；The port of export of the compressor (17), the cold side of regenerator (20),
The gas inlet and outlet end of combustion chamber (16), turbine (18), the heat absorbing side of regenerator (20), flue gas-supercritical CO2Heat exchanger (13)
Cold side, the cold side arrival end of flue gas-heat exchange gas device (15) pass sequentially through pipeline connection；
The gas electricity generator (19) is coaxial with turbine (18), compressor (17)；
The smoke evacuation of the gas turbine power generation cycle subsystem (300) passes through the flue gas-supercritical CO2Heat exchanger (13) put
Hot side is to the supercritical CO2Power generation sub-system (200) heat release.
5. a kind of method of pressure energy of natural gas and cold energy combined recovery, it is characterised in that including：
S1, pressure energy of natural gas reclaim subsystem (100) and carry out after multiple expansion to output pressure outside system the first natural gas
The second natural gas after reduction, while externally generate electricity, so as to realize the recovery of the pressure energy to first natural gas；
S2, supercritical CO2Power generation sub-system (200) reclaims natural after subsystem (100) expands to through the pressure energy of natural gas
Gas heat release, and absorbed heat from the smoke evacuation of the gas turbine power generation cycle subsystem (300), realize supercritical CO2Working medium enclosed is followed
Ring, externally generates electricity, so as to realize the recovery to first natural gas cold energy；
S3, gas turbine power generation cycle subsystem (300) carry out gas turbine hair with part second natural gas as fuel
Electricity；And by discharging fume to the supercritical CO2Power generation sub-system (200) heat release.
6. the method for pressure energy of natural gas according to claim 5 and cold energy combined recovery, it is characterised in that step S1's
Pressure energy of natural gas reclaim subsystem (100) including high-pressure turbine expanding machine (1), the first generator (2), high pressure heat exchanger (3),
Middle pressure turbine expanding machine (4), middle pressure heat exchanger (5), low-pressure turbine expanding machine (6), the second generator (7) and low pressure heat exchanger
(8)；
Step S1 includes：
The arrival end of the high-pressure turbine expanding machine (1) introduces first natural gas；First natural gas sequentially passes through the height
Pressure turbo-expander (1) once expansion, from high pressure heat exchanger (3) once heat absorption, it is secondary swollen in middle pressure turbine expanding machine (4)
It is swollen, therefrom secondary heat absorption in pressure heat exchanger (5), in (6) triple-expansion of low-pressure turbine expanding machine and three from low pressure heat exchanger (8)
After secondary heat absorption, be converted to the second natural gas and export to outside system；
First natural gas drives first generator (2) while the high-pressure turbine expanding machine (1) once expands
Rotate, externally generate electricity；
First natural gas reexpansion and in low-pressure turbine expanding machine (6) three times in medium pressure turbo-expander (4)
While expansion, drive second generator (7) to rotate, externally generate electricity；
Through the pressure energy of natural gas reclaim subsystem (100) expand after natural gas from the high pressure heat exchanger (3) once
The heat of three heat absorptions of heat absorption, the secondary heat absorption of medium pressure heat exchanger (5) and the low pressure heat exchanger (8) is all from described
Supercritical CO2The heat release of power generation sub-system (200).
7. the method for pressure energy of natural gas according to claim 5 and cold energy combined recovery, it is characterised in that step S2's
Supercritical CO2Power generation sub-system (200) includes high pressure heat exchanger (3), middle pressure heat exchanger (5), low pressure heat exchanger (8), CO2Generate electricity
Machine (9), regulating valve (10), CO2Expanding machine (11), CO2Compressor (12), flue gas-supercritical CO2Heat exchanger (13)：
Step S2 includes：
The CO2Compressor 12 introduces supercritical CO2Working medium；The supercritical CO2Working medium sequentially passes through the CO2Compressor is carried out
Compression, from flue gas-supercritical CO2Heat exchanger (13) heat absorption, in CO2Expansion in expanding machine (11), to high pressure heat exchanger (3) once
Heat release, to it is middle pressure heat exchanger (5) secondary heat release, to (8) three heat releases of low pressure heat exchanger after, be returned to CO2In compressor (12)
It is circulated；
The supercritical CO2Working medium is in CO2In expanding machine (11) CO is driven while expansion2Generator (9) is rotated, externally
Generate electricity.
8. the method for pressure energy of natural gas according to claim 5 and cold energy combined recovery, it is characterised in that step S3's
Gas turbine power generation cycle subsystem (300) includes control valve (14), flue gas-heat exchange gas device (15), combustion chamber (16), pressure
Mechanism of qi (17), turbine (18), gas electricity generator (19), regenerator (20), flue gas-supercritical CO2Heat exchanger (13)；
Step S3 includes：
Second natural gas is introduced gas turbine power generation cycle subsystem by control valve (14)；The second natural gas warp
Cross and enter combustion chamber (16) after flue gas-heat exchange gas device (15) heat absorption；
The compressor (17) introduces air；After the air is through the compression of the compressor (17), in regenerator (20) heat absorption
Into combustion chamber (16) and the natural gas mixing after-combustion for entering combustion chamber (16), flue gas is produced；
The flue gas enters after turbine (18) expansion turns into smoke evacuation, and faces successively to (20) heat releases of regenerator, to flue gas-super
Boundary CO2Heat exchanger (13) secondary heat release, to (15) three heat releases of flue gas-heat exchange gas device；
The flue gas drives compressor (17) and gas electricity generator (19) to rotate in turbine (18) while expansion；The combustion gas
Generator (19) externally generates electricity.
The heat of the secondary heat release of smoke evacuation is by the supercritical CO2Power generation sub-system (200) absorbs.
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