CN208982132U - LNG cold energy Stirling power generation coupling expansion power generation machine set system - Google Patents

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

LNG cold energy Stirling power generation coupling expansion power generation machine set system

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:

Q_Always=F_LNG*(T_For-T₀)*C_pLNG=Q_Stirling+Q_Heater+Q_Turbine

Stirling generator couples expanding machine and Rankine cycle power generation:

Q_Always=F_LNG*(T_For-T₀)*C_pLNG=Q_Stirling+Q_Heater+Q_Turbine+Q_Rankine

Stirling generator couples expanding machine and the power generation of low temperature Brayton cycle:

Q_Always=F_LNG*(T_For-T₀)*C_pLNG=Q_Stirling+Q_Heater+Q_Turbine+Q_Brayton

Wherein: Stirling cold energy use total amount Q_Stirling=F_LNG*(T₂-T₁)*C_pLNG

Rankine cycle cold energy use total amount Q_Rankine=F_LNG*(T₃-T₂)*C_pLNG

Brayton cycle cold energy use total amount Q_Brayton=F_LNG*(T_3’-T_2’)*C_pLNG

Expanding machine cold energy use total amount Q_Turbine=F_LNG*(H’-H₀)

LNG heater radiation loss Q_Heater=Q₁+Q₂+…+Q_n

2. cold energy use generated energy calculating formula:

Stirling generator couples expanding machine power generation:

P_Always=P_Stirling+P_Turbine

Stirling generator couples expanding machine and Rankine cycle power generation:

P_Always=P_Stirling+P_Turbine+P_Rankine

Stirling generator couples expanding machine and the power generation of low temperature Brayton cycle:

P_Always=P_Stirling+P_Turbine+P_Brayton

Stirling generated energy P_Stirling=F_{Working medium}*Q_{Heat absorption}*η_S*η_e

=F_{Working medium}*Q_{Heat absorption}*(1-T_1’/T_2’)*η_e

In formula, P_StirlingStirling generator generated energy；F_{Working medium}For cycle fluid flow in Stirling-electric hybrid；η_SFor Stirling Engine thermal efficiency, η_eFor generator efficiency, Q_{Heat absorption}For Stirling-electric hybrid hot end caloric receptivity, T is determined_2’Hot end mean temperature, T_1’For Cold end mean temperature is by Stirling cold energy use total amount Q_StirlingIt determines.

Rankine cycle or low temperature Brayton cycle generated energy

P_{Rankine or Brayton}=F working medium * Q_{Heat absorption}*η_{R or B}*η_e

=F_{Working medium}*Q_{Heat absorption}*(1-T_4’/T_5’)*η_e

In formula, P_{Rankine or Brayton}For Rankine cycle or Brayton cycle generated energy；F_{Working medium}For cycle fluid flow；η_RIt is bright Agree thermal efficiency of cycle, η_BFor the Brayton cycle thermal efficiency, η_eFor generator efficiency, Q_{Heat absorption}For Stirling-electric hybrid hot end caloric receptivity, determine Determine T_5’Average endothermic temperature, T_4’It is average exothermic temperature by Rankine cycle or Brayton cycle cold energy use total amount Q_{Rankine or Brayton}It determines.

Expanding machine generated energy P_Turbine=Q_Turbine*η_T*η_e

=F_LNG*(H’-H₀)*η_T*η_e

In formula, F_LNGFor 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；η_TFor the expanding machine thermal efficiency；η_eFor 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.