CN106285806A - A kind of condensed in two stages Rankine cycle electricity generation system utilizing cold energy of liquefied natural gas - Google Patents
A kind of condensed in two stages Rankine cycle electricity generation system utilizing cold energy of liquefied natural gas Download PDFInfo
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- CN106285806A CN106285806A CN201610840083.4A CN201610840083A CN106285806A CN 106285806 A CN106285806 A CN 106285806A CN 201610840083 A CN201610840083 A CN 201610840083A CN 106285806 A CN106285806 A CN 106285806A
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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
- 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
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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
- 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
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
Abstract
The invention discloses a kind of condensed in two stages Rankine cycle electricity generation system utilizing cold energy of liquefied natural gas, belong to cold energy of liquefied natural gas power field.This system includes the first decompressor of one-level condensation cycle system, the first electromotor, the first condenser, the first working medium pump, second decompressor of B-grade condensation circulation, the second electromotor, the second condenser, the second working medium pump, and blender, vaporizer, separator, the first sea water pump, the second sea water pump and primary heater.Whole power generation process includes one-level condensation Rankine cycle generating and B-grade condensation Rankine cycle two parts of generating, it is achieved that the utilization step by step of LNG cold energy, reduces the exergy loss of LNG cold energy removal process, improves the generating efficiency of LNG cold energy.The composite can be widely applied to LNG cold energy generation field.
Description
Technical field
The invention belongs to liquefied natural gas (LNG) cold energy generation field, utilize cold energy of liquefied natural gas particularly to one
Condensed in two stages Rankine cycle electricity generation system.
Background technology
Liquefied natural gas (LNG), as one of 21 century main energy, needs before using to be vaporized, at its vaporescence
Middle meeting discharges substantial amounts of cold energy, and its value is about 830-860kJ/kg.LNG cold energy is the clean energy resource of a kind of high-quality, if LNG tool
Some cold energy are converted into electric energy with the efficiency of 100%, then the cold energy of 1tLNG is equivalent to the electric energy of 240kW h.Traditional
In gasification process, the cold that LNG carries is taken away by sea water or air, causes the profligacy of the energy, makes neighbouring sea simultaneously
Yu Huozhan district environment is by serious cold pollution.As can be seen here, effective abundant to the energy of LNG high-grade cold energy is recycled
Utilize and alleviate energy shortage situation and also there is considerable economic benefit and social benefit.
Mainly have currently, with respect to the technology utilizing LNG cold energy generation: utilize the direct expansion method of LNG pressure energy, utilization
The Rankine cycle method of LNG cold energy and the combination method of comprehensive both technology.
1. direct expansion method
Direct expansion method is a kind of mode utilizing the pressure of LNG to generate electricity.In storage tank, the LNG of normal pressure is forced into pipe through pump
Net discharge pressure, utilizes high-pressure natural gas directly to drive turbo-expander after revaporizer heating vaporization, drives electrical power generators.
Vaporizer thermal source can use sea water, it is possible to use other thermals source.
2. coolant Rankine cycle method
Coolant Rankine cycle method is a kind of mode utilizing LNG cold energy generation, and its process is that LNG passes through condenser cold
It is transformed on a certain coolant, utilizes the temperature difference between LNG and environment, promote coolant to carry out Steam Power Circulation, thus externally
Acting generating.There is either simplex matter Rankine cycle system, the Rankine cycle system of mixed working fluid, generally in the generating of wherein Rankine cycle method
With the mixture of lower boiling ethane, propane or multicomponent hydro carbons as working medium, with sea water as thermal source, with LNG as low-temperature receiver, carry out
Organic rankie cycle generates electricity.
3. combination method
Combination method combines direct expansion method and Rankine cycle method.The most elevated pressure of LNG, then passing through condenser will
Cold is released to coolant, promotes coolant to carry out Rankine cycle and externally does work, and the natural gas of vaporization is done work by turbine expansion again.
There are the following problems:
Direct expansion method make use of high-pressure natural gas direct expansion to generate electricity, but requires the sky after vaporization for LNG receiving station
So gas can be directly entered high-pressure natural gas official website, and pressure is at about 6-10MPa, therefore to ensure admission pressure, the most swollen
Swollen method is inefficient, generated output is low.For in the Rankine cycle of intermediate heat carrier and combination method, due to LNG vaporization process temperature
Degree span is relatively big, and hot and cold stream heat transfer temperature difference is excessive, is difficult to reclaim efficiently the cold energy of LNG, heat exchange by the mode of single-stage condensation
Journey exergy loss is relatively big, and this is the principal element always perplexing LNG cold energy generation large-scale promotion.
Summary of the invention
In order to solve the weak point that above-mentioned prior art exists, the primary and foremost purpose of the present invention is to provide one to utilize liquid
Change the condensed in two stages Rankine cycle electricity generation system of natural gas cold energy.This system can be on the premise of not affecting supply demand, profit
Considerable electric energy is obtained with the cold energy of LNG.The present invention is to improve on the Rankine cycle generation technology of existing coolant,
Achieve the utilization step by step of LNG cold energy, reduce the exergy loss of LNG cold energy removal process, improve the generating effect of LNG cold energy
Rate.
Technical scheme:
A kind of condensed in two stages Rankine cycle electricity generation system utilizing cold energy of liquefied natural gas, including one-level condensation cycle system
The first decompressor, the first electromotor, the first condenser, the first working medium pump, B-grade condensation circulation the second decompressor, second
Motor, the second condenser, the second working medium pump, and blender, vaporizer, separator, the first sea water pump, the second sea water pump and
One heater.
LNG, after LNG booster pump pressurizes, enters the first condenser of one-level condensation cycle, with the first decompressor acting
After cycle fluid carry out heat exchange；The second condenser of B-grade condensation circulation is entered, after the second decompressor acting after heat exchange
Cycle fluid carries out heat exchange；Enter primary heater after heat exchange, carry out heat exchange with the sea water through the second sea water pump pressurization, complete
LNG vaporization process, becomes natural gas NG；
The first condensed cycle fluid of condenser enters the first working medium pump pressurization, the second condensed circulation industrial of condenser
Matter enters the second working medium pump pressurization；Cycle fluid after first working medium pump pressurization and the cycle fluid after the pressurization of the second working medium pump enter
Enter blender mixing；The mixed cycle fluid of blended device changes in vaporizer with the sea water through the first sea water pump pressurization
Heat；Cycle fluid after evaporator heat exchange enters separator and separates；Cycle fluid after separated device separates respectively enters the
One decompressor and the second decompressor, drive the first electromotor and the second electrical power generators respectively；Through the first decompressor and after
Working medium after two decompressor actings respectively enters the first condenser and the second condenser and completes whole circulation with LNG heat exchange.
Beneficial effects of the present invention:
1. due to the fact that employing LNG cold energy generates electricity, on the premise of not affecting supply demand, be effectively utilized LNG
High-grade cold energy, it is thus achieved that considerable electric energy.
2. liquefied natural gas meeting released cold quantity in vaporescence, this is an alternating temperature process, if using single-stage condensation,
Then working medium can only absorb cold under a steady temperature, and its heat transfer temperature difference is relatively big, and the present invention uses condensed in two stages system, pressurization
After liquefied natural gas sequentially pass through one-level condensation cycle electricity generation system and B-grade condensation cycle generating system, it is achieved that LNG is cold
The utilization step by step of energy, improves the performance of system, improves the generating efficiency of LNG cold energy.
3. the present invention uses propane as working medium, it is possible to that adopts uses mixed working fluid, can select to close according to engineering practice
Suitable working medium, thus on working medium selects, there is the advantages such as flexible.
4. the main object of the present invention is to utilize LNG cold energy generation, if there being suitable industrial exhaust heat, and can be at working medium vapour
After change, utilize industrial exhaust heat heating further to working medium, improve working medium and enter the temperature of decompressor, produce more electric energy, enter one
Step improves cycle efficieny, and therefore the present invention also can utilize LNG cold energy and industrial exhaust heat simultaneously, and the suitability is wide.
In sum, the present invention is using sea water as thermal source, and propane, as working medium, uses condensed in two stages system, it is possible to obtain
The highest generating efficiency, system easy to use and flexible is good.In theory, the system of the present invention, LNG cold energy generation efficiency ratio are used
The thermal efficiency of conventional LNG cold energy combination method generating improves about 63.47%, can be widely applied to LNG cold energy generation system.
Accompanying drawing explanation
Fig. 1 is to utilize LNG cold energy direct expansion method generating schematic diagram in prior art.
Fig. 2 is to utilize LNG cold energy Rankine cycle method generating schematic diagram in prior art.
Fig. 3 is to utilize LNG cold energy combination method generating schematic diagram in prior art.
Fig. 4 is the schematic diagram that the present invention utilizes the condensed in two stages Rankine cycle electricity generation system of LNG cold energy.
In figure: 1 first sea water pump；2 second sea water pumps；3 the 3rd sea water pumps；4 LNG booster pumps；5 first working medium pumps；6
Two working medium pumps；7 vaporizers；8 primary heaters；9 secondary heaters；10 first condensers；11 second condensers；12 first expand
Machine；13 first electromotors；14 second decompressors；15 second electromotors；16 blenders；17 separators.
Detailed description of the invention
Below in conjunction with accompanying drawing and technical scheme, further illustrate the detailed description of the invention of the present invention.
Embodiment 1
The present embodiment uses pressure to be 0.1MPa, and temperature is the liquefied natural gas of-162 DEG C, and treating capacity is 3600kg/h, its
Mole consist of: methane 91.33%, ethane 5.36%, propane 2.14%, normal butane 0.47%, iso-butane 0.46%, pentane
0.01%, isopentane 0.01%, nitrogen 0.22%.Working medium needed for cyclic process is propane, and thermal source is sea water, and pressure is
0.1MPa, temperature is 15 DEG C.
As it is shown in figure 1, prior art utilizes LNG cold energy direct expansion method electricity generation system by first sea water pump the 1, second sea
Water pump 2, LNG booster pump 4, vaporizer 7, primary heater the 8, first decompressor the 12, first electromotor 13 form.Concrete technology walks
Rapid and process conditions are as follows:
Material liquid LNG 3600kg/h pressure is increased to 14.2MPa by LNG supercharging 4 pump, temperature from-162 DEG C become-
155.5 DEG C, LNG booster pump 4 power consumption is 38.45KW.LNG after pressurization enters vaporizer 7, adds with through the first sea water pump 1
Sea water (pressure is 0.3MPa, and temperature is 15.01 DEG C, and the first sea water pump 1 power consumption is 3.81KW) after pressure carries out heat exchange,
LNG completely vaporizes, and temperature is increased to 13 DEG C, pressure constant (14.2MPa), and the LNG completely vaporized enters the first decompressor 12 and does
Merit, drives the first electromotor 13 to generate electricity, and the pressure of NG is down to 6MPa, and temperature is reduced to-37.11 DEG C, and generated output is
54.26KW.Low pressure NG after acting through primary heater 8 with after the second sea water pump 2 pressurization sea water (pressure is 0.3MPa,
Temperature becomes 15.01 DEG C, and the second sea water pump 2 power consumption is 1.76KW) heat exchange, make NG temperature reach 10 DEG C, pressure is constant
(6MPa), transmission pipeline network is finally entered.
Being computed clean output work in the process is 10.24KW, and the thermal efficiency is 1.3%,Efficiency is 2.8%.
As in figure 2 it is shown, prior art utilizes the Rankine cycle method electricity generation system of LNG cold energy by the first sea water pump 1, second
Sea water pump 2, LNG booster pump the 4, first working medium pump 5, vaporizer 7, primary heater the 8, first condenser the 10, first decompressor 12,
First electromotor 13 forms.Concrete technology step and process conditions are as follows:
(1) natural gas vaporization system
Material liquid LNG 3600kg/h pressure is increased to 6MPa by LNG booster pump 4, temperature from-162 DEG C become-
159.3 DEG C, LNG booster pump 4 power consumption is 16.09KW.LNG after pressurization enters the first condenser 10, with the first decompressor
In 12 after acting low pressure refrigerant Working medium gas carry out heat exchange, absorb the heat from coolant, LNG is vaporized, and temperature raises
For-56.77 DEG C, pressure constant (6MPa), refrigerant medium gas is condensed into liquid respectively, and temperature is down to-52 DEG C, and pressure is
64.56kPa.LNG after vaporization enter primary heater 8 with after the second sea water pump 2 pressurization sea water (pressure is 0.3MPa,
Temperature becomes 15.01 DEG C, and the second sea water pump 2 power consumption is 3.11KW) heat exchange, make NG temperature reach 10 DEG C, pressure is constant
(6MPa), transmission pipeline network is finally entered.
(2) coolant Rankine cycle electricity generation system
Gained refrigerant medium liquid (temperature-52 DEG C, pressure 64.56kPa) is added through the first working medium pump 5 and is pressed into high pressure coolant
Worker quality liquid, pressure is 594.3kPa, and temperature is-51.67 DEG C, and the first working medium pump 5 power consumption is 1.35KW.By high pressure coolant
(pressure is 0.3MPa, and temperature becomes 15.01 DEG C, the first sea water pump 1 for worker quality liquid and the sea water after the first sea water pump 1 pressurization
Power consumption is 4.64KW) in vaporizer 7, carry out heat exchange, make high pressure refrigerant medium vaporize, temperature becomes 8 DEG C, pressure
Constant (pressure is 594.3kPa), the refrigerant medium completely vaporized enters the first decompressor 12 and does work, and drives the first electromotor 13
Generating, generated output is 81.13KW.Power pressure after acting is reduced to 64.56kPa, and temperature becomes-50.16 DEG C, obtains low
Pressure refrigerant medium gas.
Being computed clean output work in the process is 55.94KW, and the thermal efficiency is 6.8%,Efficiency is 15.57%.
As it is shown on figure 3, prior art utilizes the combination method electricity generation system of LNG cold energy by first sea water pump the 1, second sea water
Pump the 2, the 3rd sea water pump 3, LNG booster pump the 4, first working medium pump 5, vaporizer 7, primary heater 8, secondary heater 9, first are cold
Condenser the 10, first decompressor the 12, first electromotor the 13, second decompressor the 14, second electromotor 15 forms.Concrete technology step and
Process conditions are as follows:
(1) natural gas direct expansion power generation system
Material liquid LNG 3600kg/h pressure is increased to 13.8MPa by LNG booster pump 4, temperature from-162 DEG C become-
155.6 DEG C, LNG booster pump 4 power consumption is 29.18KW.LNG after pressurization enters the first condenser 10, with the first decompressor
In 12, the low pressure refrigerant Working medium gas after acting carries out heat exchange, absorbs the heat from coolant, and LNG is partially vaporized, temperature liter
A height of-51.29 DEG C, pressure constant (10.8MPa), refrigerant medium gas is condensed into refrigerant medium liquid respectively, and temperature is down to-
47 DEG C, pressure is 81.70kPa.LNG after part vaporization enters primary heater 8 and the sea water after the second sea water pump 2 pressurization
(pressure is 0.3MPa, and temperature becomes 15.01 DEG C, and the second sea water pump 2 power consumption is 3.39KW) heat exchange, makes natural gas temperature reach
To 11 DEG C, pressure constant (10.8MPa), does work subsequently into the second decompressor 14, drives the second electromotor 15 to generate electricity, after acting
NG pressure drop as little as 6MPa, temperature reduces-36.65 DEG C, and generated output is 38.29KW.Low pressure NG enters natural gas second and heats
(pressure is 0.3MPa, and temperature becomes 15.01 DEG C, the 3rd sea water pump 3 consumed work for device 9 and the sea water after the 3rd sea water pump 3 pressurization
Rate is 1.29KW) carry out heat exchange, make NG temperature reach 10 DEG C, pressure constant (6MPa), finally enter transmission pipeline network.
(2) coolant Rankine cycle electricity generation system
Refrigerant medium liquid (temperature-41 DEG C, pressure 81.70kPa) is added through the first working medium pump 5 and is pressed into high pressure refrigerant medium
Liquid, pressure is 590.3kPa, and temperature is-46.67 DEG C, and the first working medium pump 5 power consumption is 1.06KW.Gained high pressure coolant work
(pressure is 0.3MPa, and temperature becomes 15.01 DEG C, and the first sea water pump 1 disappears for matter liquid and the sea water after the first sea water pump 1 pressurization
Wasted work rate is 3.59KW) in vaporizer 7, carry out heat exchange, make high pressure refrigerant medium gasify, temperature becomes 8 DEG C, and pressure is not
Becoming (pressure is 590.3kPa), the refrigerant medium being gasified totally enters the first decompressor 12 and does work, and drives 13, the first electromotor
Electricity, generated output is 58.86KW.Power pressure after acting is reduced to 81.70kPa, and temperature is reduced to--44.52 DEG C, obtain
Low pressure refrigerant Working medium gas.
Being computed clean output work in the process is 58.64KW, and the thermal efficiency is 6.99%,Efficiency is 16.04%.
As shown in Figure 4, the present invention utilizes the condensed in two stages cycle generating system of LNG cold energy by first sea water pump the 1, second sea
Water pump 2, LNG booster pump the 4, first working medium pump the 5, second working medium pump 6, vaporizer 7, primary heater the 8, first condenser 10,
Two condenser the 11, first decompressor the 12, first electromotor the 13, second decompressor the 14, second electromotors 15, blender 16, separation
Device 17 forms.
(1) liquefied natural gas gasifying system
Material liquid LNG 3600kg/h pressure is increased to 6MPa by LNG booster pump 4, temperature from-162 DEG C become-
159.3 DEG C, LNG booster pump 4 power consumption is 16.09KW.LNG after pressurization initially enters one-level condensation cycle, cold first
In condenser 10 with acting in the first decompressor 12 after low pressure refrigerant Working medium gas carry out heat exchange, absorb the heat from coolant
Amount, promotes the temperature of LNG, and temperature is increased to-107 DEG C, and pressure constant (6MPa), refrigerant medium gas is condensed into coolant respectively
Worker quality liquid, temperature is down to-102 DEG C, and pressure is 2.595kPa.Then the LNG after heating enters B-grade condensation circulation, second
In condenser 11 with acting in the second decompressor 14 after low pressure refrigerant Working medium gas carry out heat exchange, absorb the heat from coolant
Amount, makes LNG portion vaporize, and temperature is increased to-52 DEG C, pressure constant (6MPa), and in B-grade condensation circulation, refrigerant medium gas divides
Not being condensed into refrigerant medium liquid, temperature is down to-47 DEG C, and pressure is 81.67kPa.The LNG of part vaporization enters the first heating
(pressure is 0.3MPa, and temperature becomes 15.01 DEG C, the second sea water pump 2 consumed work for device 8 and the sea water after the second sea water pump 2 pressurization
Rate is 2.7KW) heat exchange, make NG temperature reach 10 DEG C, pressure constant (6MPa), finally enter transmission pipeline network.
(2) coolant Rankine cycle electricity generation system
By refrigerant medium liquid in gained one-level condensation cycle (temperature-102 DEG C, pressure 2.595kPa) through the first working medium pump
5 add and are pressed into high pressure refrigerant medium liquid, and pressure is 653.9kPa, and temperature is-101.7 DEG C, and the first working medium pump 5 power consumption is
0.49KW.In being circulated by gained B-grade condensation, refrigerant medium liquid (temperature-35 DEG C, pressure 137.4kPa) is through the second working medium simultaneously
Pump 6 is forced into uniform pressure 653.9kPa, and temperature becomes-46.67 DEG C, and the second working medium pump 6 power consumption is 1.01KW.By two strands
The blended device of refrigerant medium liquid 16 that pressure is identical mixes, and temperature becomes-63.34 DEG C.Then by mixed high pressure coolant
(pressure is 0.3MPa, and temperature becomes 15.01 DEG C, and the first sea water pump 1 disappears for worker quality liquid and the sea water through the first sea water pump 1 pressurization
Wasted work rate is 7.76KW) in vaporizer 7, carry out heat exchange, make high pressure refrigerant medium gasify, temperature is increased to 11 DEG C, pressure
Constant (pressure is 653.9kPa).Then high-pressure working medium gas entrance diverter 17 shunts: one flow is 1404kg/h, enters
First decompressor 12 of one-level condensation cycle does work, and drives the first electromotor 13 to generate electricity, and generated output is 63.92KW, after acting
Power pressure be reduced to 2.595kPa, temperature is reduced to-102 DEG C；Another plume amount is that 2992kg/h entrance B-grade condensation follows
Second decompressor 14 of ring does work, and drives the second electromotor 15 to generate electricity, and generated output is 60.03KW, the power pressure after acting
Being reduced to 81.67kPa, temperature is reduced to-47 DEG C, obtains low pressure refrigerant Working medium gas.
Being computed clean output work in the process is 95.9KW, and the thermal efficiency is 10.92%,Efficiency is 26.23%.
By above-mentioned detailed description of the invention, the present invention is relative to existing LNG cold energy generation system either clean output work
Or efficiency is all significantly increased.Under the same conditions, compared with the most existing combination method relatively, clean output work improves
63.47%, the thermal efficiency improves 56.13%,Efficiency improves 63.52%.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-described embodiment
Limit, the change made under other any spirit without departing from the present invention and principle, modification, alternative combinations, simplification, all
Should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (1)
1. the condensed in two stages Rankine cycle electricity generation system utilizing cold energy of liquefied natural gas, it is characterised in that this condensed in two stages
Rankine cycle electricity generation system includes the first decompressor of one-level condensation cycle system, the first electromotor, the first condenser, the first work
Matter pump, the second decompressor of B-grade condensation circulation, the second electromotor, the second condenser, the second working medium pump, and blender, steaming
Send out device, separator, the first sea water pump, the second sea water pump and primary heater；
LNG, after LNG booster pump pressurizes, enters the first condenser of one-level condensation cycle, after the first decompressor acting
Cycle fluid carries out heat exchange；The second condenser of B-grade condensation circulation is entered, with the circulation after the second decompressor acting after heat exchange
Working medium carries out heat exchange；Enter primary heater after heat exchange, carry out heat exchange with the sea water through the second sea water pump pressurization, complete LNG vapour
Change process, becomes natural gas NG；
The first condensed cycle fluid of condenser enters the first working medium pump pressurization, and the second condensed cycle fluid of condenser enters
Enter the second working medium pump pressurization；Cycle fluid after first working medium pump pressurization and the cycle fluid after the pressurization of the second working medium pump enter mixed
Clutch mixes；The mixed cycle fluid of blended device carries out heat exchange with the sea water through the first sea water pump pressurization in vaporizer；
Cycle fluid after evaporator heat exchange enters separator and separates；It is swollen that cycle fluid after the separation of separated device respectively enters first
Swollen machine and the second decompressor, drive the first electromotor and the second electrical power generators respectively；After swollen through the first decompressor and second
Working medium after the acting of swollen machine respectively enters the first condenser and the second condenser and completes whole circulation with LNG heat exchange.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106593553A (en) * | 2017-01-09 | 2017-04-26 | 大连理工大学 | Multi-level expansion power generation system recycling liquefied natural gas cold energy |
| CN106640248A (en) * | 2017-01-09 | 2017-05-10 | 大连理工大学 | Two-stage transcritical Rankine cycle power generation system using geothermal energy |
| CN106939802A (en) * | 2017-04-12 | 2017-07-11 | 上海交通大学 | Generated electricity and remaining cold output system and method using the mixed working fluid step of LNG cold energy |
| CN107725129A (en) * | 2017-09-20 | 2018-02-23 | 大连理工大学 | A kind of component controllable type condensed in two stages Rankine cycle electricity generation system using LNG cold energy |
| CN108425713A (en) * | 2018-05-18 | 2018-08-21 | 江苏大学 | A kind of organic Rankine cycle power generation system based on gas-liquid separation and twin-stage evaporation |
| CN110185509A (en) * | 2019-06-11 | 2019-08-30 | 赫普科技发展（北京）有限公司 | A kind of thermal power plant's coupling LNG cold energy generation system and method |
| CN110541737A (en) * | 2019-08-12 | 2019-12-06 | 山东大学 | medium-low temperature waste heat power generation system utilizing LNG cold energy and working method thereof |
| CN114776407A (en) * | 2022-03-31 | 2022-07-22 | 福州大学 | Liquefied natural gas cold energy power generation and reforming hydrogen production combined system |
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| CN102967099A (en) * | 2012-11-08 | 2013-03-13 | 暨南大学 | Energy cascade comprehensive utilization method of LNG (liquefied natural gas) cold energy |
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