CN208982132U - LNG cold energy Stirling power generation coupling expansion power generation machine set system - Google Patents
LNG cold energy Stirling power generation coupling expansion power generation machine set system Download PDFInfo
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- CN208982132U CN208982132U CN201821852563.3U CN201821852563U CN208982132U CN 208982132 U CN208982132 U CN 208982132U CN 201821852563 U CN201821852563 U CN 201821852563U CN 208982132 U CN208982132 U CN 208982132U
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Abstract
It generates electricity the utility model discloses a kind of LNG cold energy Stirling and couples expansion power generation machine set system, including LNG storage tank, LNG liquid phase pipeline, LNG gas phase pipeline, cold energy Stirling generating set, LNG heater, expanding machine and generating set, low temperature Brayton cycle cold energy generation system or Rankine cycle cold energy generation system can also be added on the basis of the above, after gas phase natural gas after completing heat exchange inside cold energy Stirling generating set is heated by LNG heater to reach the temperature, pressure requirement of pipe natural gas or natural gas sled tank car, it can be by gas pipeline for users to use.The utility model effective use LNG cold energy and warm end temperature difference cause the cooling compression and heat absorption expansion of working media, to drive electrical power generators.Meanwhile cold energy Stirling electricity generation system realizes higher generating efficiency and bigger generated energy by coupling secondary medium Rankine cycle and expander device or low temperature Brayton cycle and expander device.
Description
Technical field
The utility model relates to liquefied natural gas (LNG) technical fields, and in particular to a kind of LNG cold energy Stirling power generation coupling
Close expansion power generation machine set system.
Background technique
It is planned according to China's energy Long-and Medium-term Development, natural gas will become a bright spot of our country energy development strategy and green
One of color energy pillar.Within following time, China will a large amount of inlet natural gas, wherein most natural gas will be with liquefaction
The mode of natural gas (LNG) is transported to China.The LNG of a large amount of imports, while a large amount of cold energy is carry, if cannot be effectively
Utilize these cold energy, it will cause huge energy waste and environmental pollution.Therefore, these cold energy how are effectively utilized, just
Become it is particularly important with it is necessary.And LNG cold energy generation is utilized, it on the one hand can effectively utilize the high-grade cold energy of LNG;It is another
Aspect does not only consume natural gas itself while obtaining huge economic benefit, but also can reduce LNG gasification
Environmental pollution in the process.This improves the energy of LNG to extensiveness and intensiveness of the natural gas in AND ENERGY RESOURCES CONSUMPTION IN CHINA structure is accelerated
Utilization efficiency realizes that national sustainable development is all very important.
Based on direct expansion method or secondary medium Rankine cycle method, both methods all exists for LNG cold energy generation at present
Generating efficiency is low, system and device structure complexity problem, and plavini is only applicable to there are the operating condition of high pressure LNG, for
Low pressure LNG system is not available.The temporary no-trump LNG cold energy combination Stirling power generation of the prior art.
Utility model content
In view of the deficiencies of the prior art, the utility model is intended to provide a kind of use that can generate electricity under environment under low pressure, by LNG
LNG cold energy Stirling power generation coupling expansion power generator system that cold energy combination Stirling generates electricity, that LNG resource utilization can be improved
System.
To achieve the goals above, the utility model adopts the following technical solution:
A kind of LNG cold energy Stirling power generation coupling expansion power generation machine set system, including LNG storage tank, LNG liquid phase pipeline, LNG
Gas phase pipeline, cold energy Stirling generating set, LNG heater, expanding machine and generating set, the liquid outlet of LNG storage tank are connected to
LNG liquid phase pipeline, the cold end connection LNG liquid phase pipeline of cold energy Stirling generating set is to absorb LNG cold energy, cold energy Stirling dress
The hot end connection external heat source set, LNG gas phase pipeline are respectively communicated with cold end and LNG heater in cold energy Stirling device to incite somebody to action
The gas phase natural gas of the cold end of cold energy Stirling device is transmitted to LNG heater, expanding machine respectively with LNG heater and generator
Group connection, the output end of LNG heater are connected to the transmission end of natural gas.Specifically, the transmission end of natural gas can be pipeline day
Right gas or natural gas prize tank car.
The content of the LNG storage tank storage is -170 DEG C~-150 DEG C liquid phase LNG.Liquefied natural gas (LNG) is natural
Gas compressed, be cooled to its boiling temperature after become liquid, usual LNG storage is in -170 DEG C~-150 DEG C, 0.1MPa
In the cryogenic storage tank of left and right.
Further, it is equipped with heat exchange coil in the cold end of the cold energy Stirling generating set, liquid phase LNG is outside heat exchange coil
Portion's evaporation becomes cryogenic natural gas.Due to the LNG of circulation low temperature outside heat exchange coil, therefore the material of heat exchange coil is low temperature resistant
Material.
Further, the heat exchange coil is connected to the gas working dielectric pipeline of cold energy Stirling generating set, is used for
It exchanges heat with the liquid phase LNG come from LNG liquid phase pipeline.
Further, the gas working dielectric of the cold energy Stirling generating set is also to be able to maintain gaseous state at -170 DEG C or less
Gas.Specifically, gas working dielectric is any one in hydrogen, helium, argon gas or other inert gases.
Further, heat source used in the hot end of the cold energy Stirling generating set is seawater, surface water, air, flue gas
Any one in waste heat, industrial exhaust heat.
Further, the heat source of the LNG heater is seawater, surface water, air, fume afterheat, appointing in industrial exhaust heat
It anticipates one kind.
Further, the LNG cold energy Stirling power generation coupling expansion power generation machine set system further includes Rankine cycle cold energy
Electricity generation system, Rankine cycle cold energy generation system include heater, heat exchanger, turbine and turbogenerator, heat exchanger difference
It is connect by LNG gas phase pipeline with heater, turbine, the cold end of cold energy Stirling generating set and LNG heater, turbine
It is connect respectively with heater and generator.Specifically, heat exchanger is condenser.
Further, the cycle fluid of the Rankine cycle cold energy generation system is propane, in ammonia, propylene, tetrafluoroethane
Any one.
Further, the LNG cold energy Stirling power generation coupling expansion power generation machine set system includes low temperature Brayton cycle
Cold energy generation system, low temperature Brayton cycle cold energy generation system include heater, heat exchanger, turbine, generator and calm the anger
Machine, heat exchanger pass through cold end, compressor, turbine and the LNG heating of LNG gas phase pipeline and cold energy Stirling generating set respectively
Device connection, heater are connect with turbine and compressor respectively, and turbine is connect with generator.Specifically heat exchanger is condensation
Device.
Further, the cycle fluid of the low temperature Brayton cycle cold energy generation system is nitrogen.Nitrogen is in entire low temperature
Bretton follows badly without phase-change.
Working principle of the utility model is:
Cold energy Stirling generating set is by working media in the hot end of Stirling generating set or cold end radiator coil tube
Circulation, in hot end expanded by heating, contracts on cooling in cold end;Liquid phase LNG enters cold energy Stirling power generation dress by LNG liquid phase pipeline
The outside of the radiator coil tube for the cold end set and the working media inside radiator coil tube exchange heat, and the cooling compression of working media, band is taken offence
Cylinder does piston motion, so that output power drives the power generation of cold energy stirling generator, working media recycles in radiator coil tube to be made
With liquid phase LNG is heated outside heat exchange coil and is vaporizated into low-temperature gaseous phase natural gas.After gas phase natural gas enters expanding machine, expansion
Machine carries out adiabatic expansion using the gas for having certain pressure and externally does work, and expanding machine drives electrical power generators.
Expanding machine can also be entered further combined with Rankine cycle cold energy generation system, LNG on the basis of the above before can
Cold energy is transferred to refrigerant by heat exchanger, LNG becomes high pressure gas at normal temperature by heat exchanger, then passes through expander,
Drive electrical power generators.And the LNG gas heated by heat source becomes pressure high temperature hot gas by turbine compressor, then through exchanging heat
Device becomes high pressure gas at normal temperature, finally drives electrical power generators through expanding machine.
On the basis of the above, further combined with low temperature Brayton cycle cold energy generation system, heat exchanger is connected into compressor,
Function of calming the anger reduces wasted work when reaching identical pressure ratio, significantly improves the device thermal efficiency.
The advantageous effects of the utility model:
1, the cooling compression of the working media inside cold energy Stirling generating set is caused using liquid phase LNG and warm end temperature difference
It is expanded with heat absorption, cylinder is driven to do piston motion, so that output power drives electrical power generators, meanwhile, the power generation of cold energy Stirling
System can be applied in low pressure LNG system;
2, cold energy Stirling electricity generation system is by coupling secondary medium Rankine cycle and expander device or low temperature Bretton
Circulation and expander device, realize higher generating efficiency and bigger generated energy;
3, liquid phase LNG is heated is vaporizated into gas phase natural gas by heating pressurization to reach pipe natural gas or natural gas sled tank
It, can be by gas pipeline for users to use after the temperature, pressure of vehicle requires.
Detailed description of the invention
Fig. 1 is the structure chart of the embodiments of the present invention 1;
Fig. 2 is the structure chart of the embodiments of the present invention 2;
Fig. 3 is the structure chart of the embodiments of the present invention 3;
Fig. 4 is the warm enthalpy state of LNG with pressure history figure.
Appended drawing reference
LNG storage tank 1;Cold energy stirling generator 2;Cold end 3;Hot end 4;Hot end heat source 5;LNG heater 6;LNG heater
Heat source 7;Expanding machine 8;Generator 9;Heat exchanger 10;Heater 11;Heater heat source 12;Turbine 13;Turbogenerator 14;Pressure
Mechanism of qi 15.
Specific embodiment
Below with reference to attached drawing, the utility model will be further described, it should be noted that following embodiment is with this
Premised on technical solution, the detailed implementation method and specific operation process are given, but the protection scope of the utility model is simultaneously
It is not limited to the present embodiment.
Embodiment 1
In the present embodiment, cold energy Stirling generating set couples expansion power generator system, that is, includes LNG storage tank 1, LNG liquid
Phase pipeline, LNG gas phase pipeline, cold energy Stirling generating set, LNG heater 6, expanding machine 8 and generator 9, LNG storage tank 1
Liquid outlet is connected to LNG liquid phase pipeline, and it is cold to absorb LNG that the cold end 3 of cold energy Stirling generating set connects LNG liquid phase pipeline
Can, the hot end 4 of cold energy Stirling device connects external heat source, and LNG gas phase pipeline is respectively communicated in the cold of cold energy Stirling device
Hold 3 and LNG heater 6 the gas phase natural gas of the cold end of cold energy Stirling device is transmitted to LNG heater, expanding machine 8 divides
It is not connect with LNG heater 6 and generator 9, the output end of LNG heater 6 is connected to the transmission end of natural gas.The cold energy this
Heat exchange coil is equipped in the cold end 3 of special woods power generator, heat exchange coil is connected to the gas work of cold energy Stirling generating set
Medium pipeline.
As shown in Figure 1, the work step of embodiment 1 is as follows:
S1-170 DEG C~-150 DEG C of liquid phase LNG is transmitted to cold energy Stirling hair by LNG liquid phase pipeline from LNG storage tank 1
The cold end 3 of electric installation, in the present embodiment, liquid phase LNG temperature are -162 DEG C;
S2 working media is passed through inside radiator coil tube by the hot end 4 of cold energy Stirling generating set, and hot end heat source 5 heats
Working media, working media expanded by heating, liquid phase LNG enter the cold end 3 of cold energy Stirling generating set by LNG liquid phase pipeline
Radiator coil tube outside and working media inside radiator coil tube exchange heat, the cooling compression of working media drives cylinder to do piston
Movement, so that output power drives cold energy stirling generator 2 to generate electricity, working media is recycled in radiator coil tube, liquid phase
LNG is heated outside heat exchange coil and is vaporizated into low-temperature gaseous phase natural gas, and the temperature of the low-temperature gaseous phase natural gas is -35 DEG C;
Liquid phase LNG vaporization after S3 is heated is cold end 3 of -35 DEG C of low-temperature gaseous phase natural gases from cold energy Stirling generating set
Discharge is transmitted to LNG heater 6 by LNG gas phase pipeline, and 24 DEG C of high pressure gas is heated as by the heat source 7 of LNG heater
Enter expanding machine 8 after body, expanding machine 8 carries out adiabatic expansion using the gas for having certain pressure and externally does work, and expanding machine 8 drives hair
Motor 9 generates electricity.Due to gas phase natural gas carry out that adiabatic expansion externally does work and consume gas itself in expanding machine 8 it is interior can,
Gas consumingly cools down itself, to make -10 DEG C of rapid drawdown of gas phase natural gas temperature;
S4-10 DEG C of gas phase natural gas passes through gas phase LNG pipeline again and is transmitted to LNG heater 6, passes through LNG heater
After the heating of heat source 7 reaches the temperature, pressure requirement that 29 DEG C meet pipe natural gas or natural gas sled tank car, it is transmitted to gas pipeline
For using.
Embodiment 2
In the present embodiment, cold energy Stirling generating set couples expansion power generator and Rankine cycle cold energy generation system, i.e.,
Including LNG storage tank 1, LNG liquid phase pipeline, LNG gas phase pipeline, cold energy Stirling generating set, LNG heater 6,8 and of expanding machine
Generator 9, the liquid outlet of LNG storage tank 1 are connected to LNG liquid phase pipeline, and the cold end 3 of cold energy Stirling generating set connects LNG liquid
Phase pipeline is to absorb LNG cold energy, and the hot end 4 of cold energy Stirling device connects external heat source, and LNG gas phase pipeline is respectively communicated in cold
The cold end 3 and LNG heater 6 of energy Stirling device are to be transmitted to LNG for the gas phase natural gas of the cold end 3 of cold energy Stirling device
Heater 6, expanding machine 8 are connect with LNG heater 6 and generator 9 respectively, and the output end of LNG heater 6 is connected to natural gas
Transmission end.Heat exchange coil is equipped in the cold end 3 of the cold energy Stirling generating set, heat exchange coil is connected to cold energy Stirling hair
The gas working dielectric pipeline of electric installation.It further include Rankine cycle cold energy generation system, Rankine cycle cold energy generation system includes
Heater 11, heat exchanger 10, turbine 13 and turbogenerator 14, heat exchanger 10 pass through LNG gas phase pipeline and heater respectively
11, turbine 13, the cold end 3 of cold energy Stirling generating set and LNG heater 6 connect, turbine 13 respectively with heater 11
It is connected with turbogenerator 14.Specifically, heat exchanger 10 is condenser.
As shown in Fig. 2, the work step of embodiment 2 are as follows:
S1-170 DEG C~-150 DEG C of liquid phase LNG is transmitted to cold energy Stirling hair by LNG liquid phase pipeline from LNG storage tank 1
The cold end 3 of electric installation, in the present embodiment, the temperature of liquid phase LNG is -162 DEG C;
S2 working media is passed through inside radiator coil tube by the hot end of cold energy Stirling generating set, and hot end heat source 5 heats
Working media, working media expanded by heating, liquid phase LNG enter the cold end 3 of cold energy Stirling generating set by LNG liquid phase pipeline
Radiator coil tube outside and working media inside radiator coil tube exchange heat, the cooling compression of working media drives cylinder to do piston
Movement, so that output power drives cold energy stirling generator 2 to generate electricity, working media is recycled in radiator coil tube, liquid phase
LNG is heated outside heat exchange coil and is vaporizated into low-temperature gaseous phase natural gas, and the low-temperature gaseous phase natural gas temperature is -35 DEG C.
Liquid phase LNG vaporization after S3 is heated is that low-temperature gaseous phase natural gas is discharged from the cold end 3 of cold energy Stirling generating set
Enter condenser 10 by LNG gas phase pipeline, cold energy is transferred to refrigerant, and LNG becomes high pressure low temperature gas, gas by condenser 10
Phase natural gas heats by the heated device heat source 12 of heater 11 and is collapsed into pressure high temperature hot gas through turbine 13, drives whirlpool
Turbine 13 is to drive turbogenerator 14 to do work, and turbine 13 is that condenser 10 provides kinetic energy, the richness being discharged from turbine 13
Remaining gas phase natural gas is circulated back to condenser 10.
Liquid phase LNG vaporization after S4 is heated is that low-temperature gaseous phase natural gas is discharged from the cold end 3 of cold energy Stirling generating set
Into condenser 10, cold energy is transferred to refrigerant, and LNG becomes high pressure low temperature gas by condenser 10, at this time -35 DEG C of gas phase day
Right gas is transmitted to LNG heater 6, is heated as entering expanding machine 8 after 24 DEG C of high pressure gas by LNG heater heat source 7, swollen
Swollen machine 9 carries out adiabatic expansion using the gas for having certain pressure and externally does work, and expanding machine 8 drives generator 9 to generate electricity.Due to gas phase
Natural gas carry out that adiabatic expansion externally does work and consume gas itself in expanding machine it is interior can, gas consumingly cools down itself,
To make -10 DEG C of rapid drawdown of gas phase natural gas temperature;
S5-10 DEG C of gas phase natural gas passes through pipeline again and is transmitted to LNG heater 6, is heated by LNG heater heat source 7
After reaching the temperature, pressure requirement that 29 DEG C meet pipe natural gas or natural gas sled tank car, gas pipeline is transmitted to for using.
The present embodiment is cold energy Stirling electricity generation system by coupling secondary medium Rankine cycle and expander device, is utilized
Cold energy driving expanding machine 8 and turbine 13 more than needed improve cold energy use rate, also mention to drive turbogenerator 14 to do work
High generating efficiency and generated energy.
Embodiment 3
In the present embodiment, cold energy Stirling generating set couples expansion power generator and low temperature Brayton cycle cold energy generation system
System includes LNG storage tank 1, LNG liquid phase pipeline, LNG gas phase pipeline, cold energy Stirling generating set, LNG heater 6, expansion
Machine 8 and generator 9, the liquid outlet of LNG storage tank 1 are connected to LNG liquid phase pipeline, and the cold end 3 of cold energy Stirling generating set connects
LNG liquid phase pipeline is to absorb LNG cold energy, and the hot end 4 of cold energy Stirling device connects external heat source, and LNG gas phase pipeline connects respectively
Cold end 3 and the LNG heater 6 of cold energy Stirling device are passed through to pass the gas phase natural gas of the cold end 3 of cold energy Stirling device
It is sent to LNG heater 6, expanding machine 8 is connect with LNG heater 6 and generator 9 respectively, and the output end of LNG heater 6 is connected to
The transmission end of natural gas.Heat exchange coil is equipped in the cold end 3 of the cold energy Stirling generating set, heat exchange coil is connected to cold energy
The gas working dielectric pipeline of Stirling generating set.It further include low temperature Brayton cycle cold energy generation system, low temperature Bretton
Recycling cold energy generation system includes heater 11, heat exchanger 10, turbine 13, turbogenerator 14 and compressor 15, heat exchanger
10 pass through cold end 3, compressor 15, turbine 13 and the LNG heater of LNG gas phase pipeline and cold energy Stirling generating set respectively
6 connections, heater 11 are connect with turbine 13 and compressor 15 respectively, and turbine 13 is connect with turbogenerator 14.Specifically
Heat exchanger 10 is condenser.
As shown in figure 3, the work step of embodiment 3 are as follows:
S1-170 DEG C~-150 DEG C of liquid phase LNG is transmitted to cold energy Stirling hair by LNG liquid phase pipeline from LNG storage tank 1
The cold end 3 of electric installation, in the present embodiment, the temperature of liquid phase LNG are -162 DEG C;
S2 working media is passed through inside radiator coil tube by the hot end 4 of cold energy Stirling generating set, passes through hot end heat source 5
Heating is so that working media expanded by heating, liquid phase LNG enter the cold end 3 of cold energy Stirling generating set by LNG liquid phase pipeline
Radiator coil tube outside and working media inside radiator coil tube exchange heat, the cooling compression of working media drives cylinder to do piston
Movement, so that output power drives cold energy stirling generator 2 to generate electricity, working media is recycled in radiator coil tube, liquid phase
LNG is heated outside heat exchange coil and is vaporizated into low-temperature gaseous phase natural gas, and the low-temperature gaseous phase natural gas temperature is -35 DEG C.
Liquid phase LNG vaporization after S3 is heated is that low-temperature gaseous phase natural gas is discharged from the cold end 3 of cold energy Stirling generating set
Enter condenser 10 by LNG gas phase pipeline, cold energy is transferred to refrigerant, and LNG is after condenser 10 becomes high pressure low temperature gas
It is passed through compressor 15 again further to compress, gas phase natural gas is after the heater heat source 12 of heater 11 heats through turbine 13
It is collapsed into pressure high temperature hot gas, drives turbine 13 to drive turbogenerator 14 to do work, turbine 13 is condenser
10 provide kinetic energy, and the gas phase natural gas more than needed being discharged from turbine 13 is circulated back to condenser 10.Compressor 15 can reach
13 wasted work of turbine is reduced in the case of identical pressure ratio.
Liquid phase LNG vaporization after S4 is heated is that low-temperature gaseous phase natural gas is discharged from the cold end 3 of cold energy Stirling generating set
Into condenser 10, cold energy is transferred to refrigerant, and LNG becomes high pressure low temperature gas by condenser 10, at this time -35 DEG C of gas phase day
Right gas is transmitted to LNG heater 6, is heated as entering expanding machine 8 after 24 DEG C of high pressure gas by LNG heater heat source 7, swollen
Swollen machine 8 carries out adiabatic expansion using the gas for having certain pressure and externally does work, and expanding machine 8 drives generator 9 to generate electricity.Due to gas phase
Natural gas carry out that adiabatic expansion externally does work and consume gas itself in expanding machine 8 it is interior can, gas consumingly cools down itself,
To make -10 DEG C of rapid drawdown of gas phase natural gas temperature;
S5-10 DEG C of gas phase natural gas passes through pipeline again and is transmitted to LNG heater 6, passes through the heater heat of heater 11
Source 12 reaches the temperature, pressure requirement that 29 DEG C meet pipe natural gas or natural gas sled tank car after heating after, it is transmitted to gas pipeline
For using.
The present embodiment is cold energy Stirling electricity generation system by coupled low temperature Brayton cycle and expander device, wherein plus
The compressor 15 entered can reduce wasted work when reaching identical pressure ratio, significantly improve the device thermal efficiency, to realize more
High generating efficiency and bigger generated energy.
As shown in figure 4, LNG cooling capacity and the change curve quick search LNG cooling capacity of the temperature, pressure of LNG can be passed through
General numerical value, but accurately cooling capacity technology needs are calculated according to following calculation formula.
Under the cold energy application cooling capacity and generated energy of above-mentioned LNG cold energy Stirling power generation coupling expansion power generation machine set system meet
The calculation formula in face:
1. cold energy use and off-energy balanced type:
Stirling generator couples expanding machine power generation:
QAlways=FLNG*(TFor-T0)*CpLNG=QStirling+QHeater+QTurbine
Stirling generator couples expanding machine and Rankine cycle power generation:
QAlways=FLNG*(TFor-T0)*CpLNG=QStirling+QHeater+QTurbine+QRankine
Stirling generator couples expanding machine and the power generation of low temperature Brayton cycle:
QAlways=FLNG*(TFor-T0)*CpLNG=QStirling+QHeater+QTurbine+QBrayton
Wherein: Stirling cold energy use total amount QStirling=FLNG*(T2-T1)*CpLNG
Rankine cycle cold energy use total amount QRankine=FLNG*(T3-T2)*CpLNG
Brayton cycle cold energy use total amount QBrayton=FLNG*(T3’-T2’)*CpLNG
Expanding machine cold energy use total amount QTurbine=FLNG*(H’-H0)
LNG heater radiation loss QHeater=Q1+Q2+…+Qn
2. cold energy use generated energy calculating formula:
Stirling generator couples expanding machine power generation:
PAlways=PStirling+PTurbine
Stirling generator couples expanding machine and Rankine cycle power generation:
PAlways=PStirling+PTurbine+PRankine
Stirling generator couples expanding machine and the power generation of low temperature Brayton cycle:
PAlways=PStirling+PTurbine+PBrayton
Stirling generated energy PStirling=FWorking medium*QHeat absorption*ηS*ηe
=FWorking medium*QHeat absorption*(1-T1’/T2’)*ηe
In formula, PStirlingStirling generator generated energy;FWorking mediumFor cycle fluid flow in Stirling-electric hybrid;ηSFor Stirling
Engine thermal efficiency, ηeFor generator efficiency, QHeat absorptionFor Stirling-electric hybrid hot end caloric receptivity, T is determined2’Hot end mean temperature, T1’For
Cold end mean temperature is by Stirling cold energy use total amount QStirlingIt determines.
Rankine cycle or low temperature Brayton cycle generated energy
PRankine or Brayton=F working medium * QHeat absorption*ηR or B*ηe
=FWorking medium*QHeat absorption*(1-T4’/T5’)*ηe
In formula, PRankine or BraytonFor Rankine cycle or Brayton cycle generated energy;FWorking mediumFor cycle fluid flow;ηRIt is bright
Agree thermal efficiency of cycle, ηBFor the Brayton cycle thermal efficiency, ηeFor generator efficiency, QHeat absorptionFor Stirling-electric hybrid hot end caloric receptivity, determine
Determine T5’Average endothermic temperature, T4’It is average exothermic temperature by Rankine cycle or Brayton cycle cold energy use total amount
QRankine or BraytonIt determines.
Expanding machine generated energy PTurbine=QTurbine*ηT*ηe
=FLNG*(H’-H0)*ηT*ηe
In formula, FLNGFor the LNG total flow kg/h in system;H ' is expander outlet natural gas enthalpy, kJ/kg;H0It is swollen
Swollen machine entrance natural gas enthalpy, kJ/kg;ηTFor the expanding machine thermal efficiency;ηeFor generator efficiency.
For those skilled in the art, it can be provided various corresponding according to above technical solution and design
Change and modification, and all these change and modification, should be construed as being included in the utility model claims protection scope it
It is interior.
Claims (10)
1. a kind of LNG cold energy Stirling power generation coupling expansion power generation machine set system, which is characterized in that including LNG storage tank, LNG liquid
Phase pipeline, LNG gas phase pipeline, cold energy Stirling generating set, LNG heater, expanding machine and generating set, LNG storage tank go out
Liquid mouth is connected to LNG liquid phase pipeline, and the cold end connection LNG liquid phase pipeline of cold energy Stirling generating set is cold to absorb LNG cold energy
The hot end of energy Stirling device connects external heat source, and LNG gas phase pipeline is respectively communicated with cold end and LNG in cold energy Stirling device
The gas phase natural gas of the cold end of cold energy Stirling device is transmitted to LNG heater, expanding machine is heated with LNG heater respectively
Device is connected with generating set, and the output end of LNG heater is connected to the transmission end of natural gas.
2. LNG cold energy Stirling power generation coupling expansion power generation machine set system according to claim 1, which is characterized in that institute
It states and is equipped with heat exchange coil in the cold end of cold energy Stirling generating set.
3. LNG cold energy Stirling power generation coupling expansion power generation machine set system according to claim 2, which is characterized in that institute
State the gas working dielectric pipeline that heat exchange coil is connected to cold energy Stirling generating set, for from LNG liquid phase pipeline
Liquid phase LNG heat exchange.
4. LNG cold energy Stirling power generation coupling expansion power generation machine set system according to claim 3, which is characterized in that institute
The gas working dielectric for stating cold energy Stirling generating set is also to be able to maintain gaseous gas at -170 DEG C or less.
5. LNG cold energy Stirling power generation coupling expansion power generation machine set system according to claim 1, which is characterized in that institute
Heat source used in the hot end of cold energy Stirling generating set is stated as appointing in seawater, surface water, air, fume afterheat, industrial exhaust heat
It anticipates one kind.
6. LNG cold energy Stirling power generation coupling expansion power generation machine set system according to claim 1, which is characterized in that institute
The heat source of LNG heater is stated as any one in seawater, surface water, air, fume afterheat, industrial exhaust heat.
7. LNG cold energy Stirling power generation coupling expansion power generation machine set system according to claim 1, which is characterized in that institute
Stating LNG cold energy Stirling power generation coupling expansion power generation machine set system further includes Rankine cycle cold energy generation system, and Rankine cycle is cold
Energy electricity generation system includes heater, heat exchanger, turbine and turbogenerator, and heat exchanger passes through LNG gas phase pipeline respectively and adds
Hot device, turbine, cold energy Stirling generating set cold end connected with LNG heater, turbine respectively with heater and turbine
Generator connection.
8. LNG cold energy Stirling power generation coupling expansion power generation machine set system according to claim 7, which is characterized in that institute
The cycle fluid of Rankine cycle cold energy generation system is stated as any one in propane, ammonia, propylene, tetrafluoroethane.
9. LNG cold energy Stirling power generation coupling expansion power generation machine set system according to claim 1, which is characterized in that institute
Stating LNG cold energy Stirling power generation coupling expansion power generation machine set system includes low temperature Brayton cycle cold energy generation system, low temperature cloth
Thunder circulation cold energy generation system includes heater, heat exchanger, turbine, turbogenerator and compressor, and heat exchanger leads to respectively
It crosses LNG gas phase pipeline to connect with the cold end of cold energy Stirling generating set, compressor, turbine and LNG heater, heater point
It is not connect with turbine and compressor, turbine is connect with turbogenerator.
10. LNG cold energy Stirling power generation coupling expansion power generation machine set system according to claim 9, which is characterized in that institute
The cycle fluid for stating low temperature Brayton cycle cold energy generation system is nitrogen.
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CN114399094A (en) * | 2021-12-29 | 2022-04-26 | 贵州电网有限责任公司 | Method for predicting generated electricity quantity and time of expansion power generation system |
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