CN106762489B - A kind of electricity generation system based on low-temperature solar energy and cold energy of liquefied natural gas - Google Patents
A kind of electricity generation system based on low-temperature solar energy and cold energy of liquefied natural gas Download PDFInfo
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- CN106762489B CN106762489B CN201611227820.XA CN201611227820A CN106762489B CN 106762489 B CN106762489 B CN 106762489B CN 201611227820 A CN201611227820 A CN 201611227820A CN 106762489 B CN106762489 B CN 106762489B
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- Prior art keywords
- power generation
- heat exchanger
- pressure
- natural gas
- rankine cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
- F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
- F03G7/05—Ocean thermal energy conversion, i.e. OTEC
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Biodiversity & Conservation Biology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Oceanography (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The electricity generation system based on low-temperature solar energy and cold energy of liquefied natural gas that the invention discloses a kind of.The electricity generation system includes double pressure Rankine cycle power generation sub-systems, single pressure Rankine cycle power generation sub-system and the direct expansion power generation subsystem of natural gas.The present invention is realized using the combination of double pressure Rankine cycles and single pressure Rankine cycle and is utilized to the deep-step of energy；The direct expansion power generation subsystem of natural gas can sufficiently recycle the pressure energy of LNG.Due to solar energy raying intensity effect fluctuate it is larger, by adjusting the pressure of double pressure Rankine cycle mesohighs circulations, it can be achieved that being mutually matched for working medium evaporating temperature and solar heat coolant-temperature gage, efficient operation of the guarantee system under variable working condition.
Description
Technical field
The present invention relates to cold energy of liquefied natural gas power generation and solar energy thermal-power-generating fields, and in particular to one kind is based on low temperature too
The electricity generation system of positive energy and cold energy of liquefied natural gas.
Background technique
Liquefied natural gas (LNG) is a kind of clean energy resource, and normal pressure storage temperature is about -162 DEG C, in gasification,
A large amount of cold energy can be discharged.Solar energy is a kind of clean renewable energy of green, be will be used wider and wider in recent years general.The sun
System heat sources can be used as, the heat generated using solar energy is gasified low-boiling organic working medium, and pushing turbine acting generates
Electric energy.LNG is recycled after the organic working medium of steam turbine is condensed by LNG as system cold source, and LNG then enters seawater
Heat exchanger heat absorption, the temperature of itself further increase, and then enter expanding machine acting power generation, recycle its pressure energy.Expansion working
Natural gas temperature afterwards reduces, and temperature is close to environment temperature after absorbing heat using seawater heat exchanger, into pipe network for huge numbers of families
It uses.
Patent CN201510279905.1 is related to a kind of electricity generation system and the electricity-generating method based on the system, the power generation
System includes mixed working fluid Rankine cycle expansion work portion, propane working medium Rankine cycle expansion work portion and natural gas direct expansion
Power Generation Section;The electricity-generating method includes the following steps: the direct expansion of gas medium level-one, first order Rankine cycle, the second level
Rankine cycle.Advantage is: principle of the method based on energy temperature counterpart and cascade utilization, is not increasing system complexity excessively
Under the premise of, by concatenated two Rankine cycles, the cold energy of LNG is utilized step by step, reduces LNG and Rankine cycle refrigerant heat transfer mistake
The exergy loss of journey, cold energy generation are more efficient.It is directly swollen by the level-one that natural gas is arranged, it can guarantee pipe network and user
Under conditions of pressure needs, the pressure energy of LNG is made full use of.But this method uses seawater as system heat sources, for the sun
The utilization efficiency of the higher heat sources of temperature such as energy is relatively low.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of power generation based on low-temperature solar energy and cold energy of liquefied natural gas
System provides thermal energy in conjunction with seawater and solar energy for system, while making full use of the cold energy of liquefied natural gas.
To achieve the above object, the present invention adopts the following technical scheme: a kind of be based on low-temperature solar energy and liquefied natural gas
The electricity generation system of cold energy, it is characterised in that: including double pressure Rankine cycle power generation sub-systems, single pressure Rankine cycle power generation sub-system and
The direct expansion power generation subsystem of natural gas；Double pressure Rankine cycle power generation sub-systems include the first circuit, second servo loop, third
Circuit and the 4th circuit, first circuit include solar thermal collector interconnected, solar energy heat-storage device, and described second time
Road includes solar heat exchanger interconnected, solar energy heat-storage device, and the tertiary circuit includes that sequentially connected solar energy changes
Hot device, Intermediate Heat Exchanger, low pressure working fluid pump, shares seawater heat exchanger, high-pressure working medium pump, the 4th circuit at the first steam turbine
Including sequentially connected first steam turbine, Intermediate Heat Exchanger, low pressure working fluid pump, share seawater heat exchanger, low pressure seawater heat exchanger；
Single pressure Rankine cycle power generation sub-system includes the Intermediate Heat Exchanger for being sequentially connected and constituting circuit, the second steam turbine, low temperature
Condenser, third working medium pump；The direct expansion power generation subsystem of natural gas includes sequentially connected LNG storage tank, LNG pump, low
Warm condenser, third seawater heat exchanger, third steam turbine, the 4th seawater heat exchanger.
Further, the working medium that double pressure Rankine cycle power generation sub-systems use is CO2。
Further, the working medium that single pressure Rankine cycle power generation sub-system uses is R32.
Further, first steam turbine is steam compensating turbine.
Compared with the prior art, the invention has the following beneficial effects:
1, the present invention goes back cascade utilization solar energy on the basis of making full use of cold energy of liquefied natural gas；
2, for the present invention there are two heat source, a part utilizes solar energy, and a part provides energy using seawater；
3, energy first passes through double pressure Rankine cycle power generation sub-systems in the present invention, after generate electricity subsystem by single pressure Rankine cycle
System, double pressure Rankine cycle power generation sub-systems and single pressure Rankine cycle power generation sub-system share an Intermediate Heat Exchanger, make solar energy
Cascade utilization is obtained with LNG；
4, two heat source temperature differences in double pressure Rankine cycle power generation sub-systems of the invention, when solar energy is influenced by weather
When temperature changes, the stable and high effective operation of system can be guaranteed by the pressure of adjusting cycle of higher pressure.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
In figure: 1- solar thermal collector；2- solar energy heat-storage device；3- solar heat exchanger；The first steam turbine of 4-；Among 5-
Heat exchanger；6- low pressure working fluid pump；7- shares seawater heat exchanger；8- high-pressure working medium pump；9- low pressure seawater heat exchanger；The second vapour of 10-
Turbine；11- low-temperature condenser；12- third working medium pump；13-LNG storage tank；14-LNG pump；15- third seawater heat exchanger；16-
Three steam turbines；The 4th seawater heat exchanger of 17-.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is please referred to, the present invention provides a kind of electricity generation system based on low-temperature solar energy and cold energy of liquefied natural gas, special
Sign is: including double pressure Rankine cycle power generation sub-systems, single pressure Rankine cycle power generation sub-system and the direct expansion power generation of natural gas
Subsystem.
Double pressure Rankine cycle power generation sub-systems include the first circuit, second servo loop, tertiary circuit and the 4th circuit, institute
Stating the first circuit includes solar thermal collector 1 interconnected, solar energy heat-storage device 2, and the second servo loop includes being connected with each other
Solar heat exchanger 3, solar energy heat-storage device 2, the tertiary circuit includes sequentially connected solar heat exchanger 3, the first vapour
Turbine 4, Intermediate Heat Exchanger 5, low pressure working fluid pump 6, share seawater heat exchanger 7, high-pressure working medium pump 8, the 4th circuit include according to
First steam turbine 4 of secondary connection, low pressure working fluid pump 6, shares seawater heat exchanger 7, low pressure seawater heat exchanger 9 at Intermediate Heat Exchanger 5.
Since solar energy raying intensity effect temperature fluctuation is larger, by adjusting double pressure Rankine cycle power generation sub-system mesohigh circulations
Pressure, it can be achieved that working medium evaporating temperature and solar heat coolant-temperature gage are mutually matched, guarantee that system is efficient under variable working condition
Operation.
Single pressure Rankine cycle power generation sub-system includes the Intermediate Heat Exchanger 5 for being sequentially connected and constituting circuit, the second vapour
Turbine 10, low-temperature condenser 11, third working medium pump 12.List pressure Rankine cycle power generation sub-system and double pressure Rankine cycles power generation subsystems
System is together in series by Intermediate Heat Exchanger 5, realizes the cascade utilization of energy.
The direct expansion power generation subsystem of natural gas includes sequentially connected LNG storage tank 13, LNG pump 14, cryogenic condensation
Device 11, third seawater heat exchanger 15, third steam turbine 16, the 4th seawater heat exchanger 17.LNG is carrying out cooling to organic working medium
In the process, itself becomes high-temperature steam, pushes third steam turbine 16 to do work after further being heated by seawater, the natural gas after acting
Entered pipe network for users to use after heating of seawater again.
In this present embodiment, double pressure first circuits of Rankine cycle power generation sub-system are solar energy heating and heat accumulation system
System.The system uses but is not limited to vacuum tube type heat collector and hot water pot type thermal storage device.When normal operation, by thermal storage device lower part
(100 ~ 150 DEG C, 0.5 MPa of pressure) of high-temperature water of the lower water of temperature out after heat collector heats enter on thermal storage device
Portion is mixed with the water in thermal storage device, promotes the mean temperature of water storage.The high temperature come out in second servo loop by thermal storage device top
(90 DEG C of temperature, 0.5 MPa of pressure) of water enter solar heat exchanger 3, carry out heat exchange with the working medium of tertiary circuit, temperature reduces
After return to thermal storage device.The working medium that tertiary circuit uses is CO2。CO2After Intermediate Heat Exchanger 5 is cooling, become at -13.7 DEG C
Saturated liquid shares seawater heat exchanger 7 by being sent into after 6 pressurization of low pressure working fluid pump.Work after sharing seawater heat exchanger 7 and heating
Matter temperature be 5 DEG C, pressure 5.08MPa, a part by high-pressure working medium pump 8 boosting after enter solar heat exchanger 3 heat absorption at
Superheated steam (85 DEG C of temperature, 7.2 MPa of pressure), another part enter the saturated gas (temperature that low pressure seawater heat exchanger 9 flashes to
15 DEG C of degree, 5.08 MPa of pressure).The superheated steam that solar heat exchanger 3 comes out enters 4 expansion work of the first steam turbine.Expansion
When to intermediate pressure, the low-pressure saturated steam come out with low pressure seawater heat exchanger 9 mix, continuation expansion work, is then entered
Between heat exchanger 5 condense, complete a working cycles.
In this present embodiment, the working medium that single pressure Rankine cycle power generation sub-system uses is R32.R32 exchanges heat in centre
CO is absorbed in device 52Condensation latent heat become superheated steam (- 20 DEG C of temperature, 0.33456 MPa of pressure), subsequently into the second vapour
Turbine 10 does work, and steam discharge is condensed into the cryogenic liquid that temperature is -88 DEG C, pressure is 0.1036 MPa through low-temperature condenser 11,
Intermediate Heat Exchanger 5 is sent back to after being pressurizeed again by third working medium pump 12, completes a working cycles.
In this present embodiment, the initial storage temperature of LNG is -162 DEG C in the direct expansion power generation subsystem of natural gas, pressure
For 0.1MPa, flow 10kg/s.It is forced into 10MPa by LNG pump, into successively low-temperature condenser 11 and third seawater to make heat exchange
Device 15 absorbs heat, and temperature is increased to 10 DEG C.After the natural gas of high pressure enters 16 expansion work of third steam turbine, it is natural to become low pressure
Gas is heated to entering pipe network for users to use close to after environment temperature by the 4th seawater heat exchanger 17.Level Four seawater heat exchanger 17
Outlet pressure is determined by the requirement of outside network or the use pressure of user.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (1)
1. a kind of electricity generation system based on low-temperature solar energy and cold energy of liquefied natural gas, it is characterised in that: followed including double pressure Rankines
Ring power generation sub-system, single pressure Rankine cycle power generation sub-system and the direct expansion power generation subsystem of natural gas；Double pressure Rankines follow
Ring power generation sub-system includes the first circuit, second servo loop, tertiary circuit and the 4th circuit, and first circuit includes being connected with each other
Solar thermal collector, solar energy heat-storage device, the second servo loop includes solar heat exchanger interconnected, solar energy heat-storage
Device, the tertiary circuit include sequentially connected solar heat exchanger, the first steam turbine, Intermediate Heat Exchanger, low pressure working fluid pump, are total to
It is pumped with seawater heat exchanger, high-pressure working medium, the 4th circuit includes sequentially connected first steam turbine, Intermediate Heat Exchanger, low pressure
Working medium pump shares seawater heat exchanger, low pressure seawater heat exchanger；Single pressure Rankine cycle power generation sub-system includes being sequentially connected simultaneously
Constitute Intermediate Heat Exchanger, the second steam turbine, low-temperature condenser, the third working medium pump in circuit；The direct expansion power generation of natural gas
Subsystem includes sequentially connected LNG storage tank, LNG pump, low-temperature condenser, third seawater heat exchanger, third steam turbine, the four seas
Water- to-water heat exchanger;The working medium that double pressure Rankine cycle power generation sub-systems use is CO2;Single pressure Rankine cycle power generation sub-system
The working medium used is R32;First steam turbine is steam compensating turbine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611227820.XA CN106762489B (en) | 2016-12-27 | 2016-12-27 | A kind of electricity generation system based on low-temperature solar energy and cold energy of liquefied natural gas |
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| CN201611227820.XA CN106762489B (en) | 2016-12-27 | 2016-12-27 | A kind of electricity generation system based on low-temperature solar energy and cold energy of liquefied natural gas |
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| CN106762489A CN106762489A (en) | 2017-05-31 |
| CN106762489B true CN106762489B (en) | 2019-02-22 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107916961B (en) * | 2017-11-16 | 2020-03-24 | 中国科学院广州能源研究所 | Solar energy and natural gas cold energy combined cascade utilization system |
| CN108361163B (en) * | 2017-12-05 | 2023-10-13 | 北京石油化工学院 | Power generation system |
| CN108252749A (en) * | 2018-01-08 | 2018-07-06 | 辽宁石油化工大学 | A kind of cold, heat and electricity triple supply method based on SAGD thickened oil recovery UTILIZATION OF VESIDUAL HEAT INs |
| CN111485965A (en) * | 2019-01-25 | 2020-08-04 | 碧海舟（北京）节能环保装备有限公司 | L NG cold energy recovery power generation method and device based on carbon dioxide working medium |
| CN110080904B (en) * | 2019-04-18 | 2024-06-25 | 杭州紫明冷链科技有限责任公司 | Cold energy cascade utilization system based on thermo-acoustic technology |
| CN110185509B (en) * | 2019-06-11 | 2024-04-16 | 赫普科技发展（北京）有限公司 | Thermal power plant coupling LNG cold energy power generation system and method |
| CN110552744A (en) * | 2019-09-06 | 2019-12-10 | 北京市燃气集团有限责任公司 | Multi-energy coupling power supply system and method |
| CN111561363B (en) * | 2020-04-29 | 2022-10-25 | 上海电力大学 | Transcritical CO 2 Heat pump energy storage system driven by power generation |
| CN112459857A (en) * | 2020-11-26 | 2021-03-09 | 天津大学 | Double-pressure organic Rankine cycle power generation system |
| CN114396367A (en) * | 2022-02-25 | 2022-04-26 | 华陆工程科技有限责任公司 | Device for utilizing cold energy of carbon dioxide satellite station driven by solar thermal energy |
| CN114810253B (en) * | 2022-04-21 | 2023-11-21 | 江苏科技大学 | Liquefied air energy storage system utilizing LNG cold energy and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS61223203A (en) * | 1985-03-27 | 1986-10-03 | Kawasaki Heavy Ind Ltd | Power system |
| CN201827033U (en) * | 2010-09-21 | 2011-05-11 | 广东工业大学 | Disc type solar Stirling heat and power cogeneration device |
| CN103925024B (en) * | 2014-04-15 | 2015-10-28 | 南京航空航天大学 | A kind of water-electricity cogeneration system and working procedure reclaiming desalination of sea water concentrated seawater waste heat |
| CN104728063B (en) * | 2015-03-24 | 2017-04-26 | 北京建筑大学 | Solar-assisted liquefied natural gas electricity-heat-cold united supply system and method |
| CN104989473B (en) * | 2015-05-27 | 2016-10-19 | 上海交通大学 | A kind of electricity generation system and electricity-generating method based on this system |
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