CN208982183U - The power generation of LNG cold energy Stirling couples additional working medium circulation electric power generation machine set system - Google Patents
The power generation of LNG cold energy Stirling couples additional working medium circulation electric power generation machine set system Download PDFInfo
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Abstract
The utility model discloses a kind of power generations of LNG cold energy Stirling to couple additional working medium circulation electric power generation machine set system, including LNG storage tank, LNG liquid phase pipeline, LNG gas phase pipeline, cold energy Stirling generating set, LNG heater and additional working medium circulation electric power generation unit, the cold end connection LNG liquid phase pipeline of cold energy Stirling generating set is to absorb LNG cold energy, the cold end of cold energy Stirling generating set is also connect with additional working medium circulation electric power generation unit, LNG gas phase pipeline is respectively communicated with cold end and LNG heater in cold energy Stirling device so that the gas phase natural gas of the cold end of cold energy Stirling device is transmitted to LNG heater, the output end of LNG heater is connected to the transmission end of natural gas.The additional working medium circulation electric power generation unit is Rankine cycle cold energy generation system or low temperature Brayton cycle cold energy generation system, cold energy Stirling electricity generation system is by coupling secondary medium Rankine cycle or low temperature Brayton cycle, it can be achieved that higher generating efficiency and bigger generated energy.
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 additional working medium circulation electric 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.
There is low generating efficiency, system and device structure complexity, the temporary no-trump of the prior art in LNG cold energy generation at present
The power generation coupling of LNG cold energy combination Stirling.
Utility model content
In view of the deficiencies of the prior art, the utility model be intended to provide it is a kind of can improve LNG resource utilization and power generation effect
The LNG cold energy Stirling power generation of rate couples additional working medium circulation electric power generation machine set system.
To achieve the goals above, the utility model adopts the following technical solution:
A kind of additional working medium circulation electric power generation machine set system of LNG cold energy Stirling power generation coupling, including LNG storage tank, LNG liquid phase
Pipeline, LNG gas phase pipeline, cold energy Stirling generating set, LNG heater and additional working medium circulation electric power generation unit, LNG storage tank
Liquid outlet is connected to LNG liquid phase pipeline, the cold end connection LNG liquid phase pipeline of cold energy Stirling generating set to absorb LNG cold energy,
The cold end of cold energy Stirling generating set is also connect with additional working medium circulation electric power generation unit, the hot end connection of cold energy Stirling device
External heat source, LNG gas phase pipeline are respectively communicated with cold end and LNG heater in cold energy Stirling device to fill cold energy Stirling
The gas phase natural gas for the cold end set is transmitted to LNG heater, and the output end of LNG heater is connected to the transmission end of natural gas.Tool
Body, the transmission end of natural gas can prize tank car for pipe natural gas or natural gas.
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, the additional working medium circulation electric power generation unit is Rankine cycle cold energy generation system, Rankine cycle cold energy hair
Electric system includes heater, heat exchanger, turbine and turbogenerator, heat exchanger pass through respectively LNG gas phase pipeline and heater,
Turbine, cold energy Stirling generating set cold end connected with LNG heater, turbine respectively with heater and turbogenerator
Connection.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 additional working medium circulation electric power generation unit is low temperature Brayton cycle cold energy generation system, low temperature mine-laying
Circulation of pausing cold energy generation system includes heater, heat exchanger, turbine, turbogenerator and compressor, and heat exchanger passes through respectively
LNG gas phase pipeline is connect with the cold end of cold energy Stirling generating set, compressor, turbine and LNG heater, heater difference
It is connect with turbine and compressor, turbine is connect with turbogenerator.Specifically, heat exchanger is condenser.
Further, the cycle fluid of the low temperature Brayton cycle cold energy generation system is nitrogen.Nitrogen is entire low
Warm Bretton follows badly without phase-change.
Further, heat exchange coil is equipped in the cold end pipeline of the cold energy Stirling generating set.Liquid phase LNG is in heat exchange plate
Pipe external 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 resistance to low
The material of temperature.
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.
Working principle of the utility model is:
Working media recycles in the hot end of Stirling generating set or cold end radiator coil tube, in hot end expanded by heating,
Cold end contracts on cooling；Liquid phase LNG enters the outer of the radiator coil tube of the cold end of cold energy Stirling generating set by LNG liquid phase pipeline
Working media inside portion and radiator coil tube exchanges heat, and the cooling compression of working media drives cylinder to do piston motion, so that output is dynamic
Power drives the power generation of cold energy stirling generator, and working media is recycled in radiator coil tube, and liquid phase LNG is outside heat exchange coil
It is heated to be vaporizated into low-temperature gaseous phase natural gas.
Liquid phase LNG is subjected to the heat source (normal temperature air or water or seawater) that hot vapour turns to low-temperature gaseous phase natural gas by heater
Heating, finally make the temperature and pressure of gas phase natural gas meet pipe natural gas or natural gas sled tank car standard externally supply
It answers；Cryogenic natural gas can also pass through condenser, and attachment cycle fluid is cooled to liquid from gaseous state using LNG cold source, add work
Then matter passes through Rankine cycle or low temperature Brayton cycle drives turbine workmanship driven generator power generation.
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；
2, cold energy Stirling electricity generation system is realized higher by coupling secondary medium Rankine cycle or low temperature Brayton cycle
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 warm enthalpy state of the LNG of the utility model with pressure history figure.
Appended drawing reference
LNG storage tank 1；Cold energy stirling generator 2；Cold end 3；Soft 4；Hot end heat source 5；LNG heater 6；LNG heater heat
Source 7；Turbine 8；Turbogenerator 9；Heat exchanger 10；Heater 11；Heater heat source 12；Compressor 13.
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 couple Rankine cycle cold energy generation system, that is, include LNG storage tank 1,
LNG liquid phase pipeline, LNG gas phase pipeline, cold energy Stirling generating set, LNG heater 6 and additional working medium circulation electric power generation unit,
The liquid outlet of LNG storage tank 1 is connected to LNG liquid phase pipeline, the cold end 3 of cold energy Stirling generating set connect LNG liquid phase pipeline with
LNG cold energy is absorbed, the cold end 3 of cold energy Stirling generating set is also connect with Rankine cycle cold energy generation system, cold energy Stirling
The hot end 4 of device connects external heat source, and LNG gas phase pipeline is respectively communicated with cold end 3 and LNG heater in cold energy Stirling device
6 to be transmitted to LNG heater 6, the output end connection of LNG heater 6 for the gas phase natural gas of the cold end 3 of cold energy Stirling device
In the transmission end of natural gas.Specifically, the transmission end of natural gas can prize tank car for pipe natural gas or natural gas.
Rankine cycle cold energy generation system includes heater 11, heat exchanger 10, turbine 8 and turbogenerator 9, heat exchanger
10 pass through LNG gas phase pipeline and heater 11, turbine 8, the cold end 3 of cold energy Stirling generating set and LNG heater respectively
11 connections, turbine 8 are connect with heater 11 and turbogenerator 9 respectively.Specifically, heat exchanger 10 is condenser.It is described bright
The cycle fluid for agreeing circulation cold energy generation system is propane, ammonia, propylene, any one in tetrafluoroethane.
As shown in Figure 1, the work step of embodiment 1 is as follows:
S1-170 DEG C~-150 DEG C liquid phase LNG are transmitted to the power generation of cold energy Stirling by LNG liquid phase pipeline from LNG storage tank 1
The cold end 3 of device, 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.
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 heater heat source 12 of heater 11 and is collapsed into pressure high temperature hot gas through turbine 8, drives whirlpool
For turbine 8 to drive turbogenerator 9 to do work, turbine 8 is that condenser 10 provides kinetic energy, is discharged from turbine 8 more than needed
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, cold energy is transferred to refrigerant, and LNG becomes high pressure low temperature gas by condenser 10, and -35 DEG C of gas phase is natural at this time
Gas is transmitted to LNG heater 6, reaches 29 DEG C by the heating of LNG heater heat source 7 and meets pipe natural gas or natural gas sled tank car
Temperature, pressure require after, be transmitted to gas pipeline for using.
Embodiment 2
In the present embodiment, cold energy Stirling generating set coupled low temperature Brayton cycle cold energy generation system includes LNG
Storage tank 1, LNG liquid phase pipeline, LNG gas phase pipeline, cold energy Stirling generating set, LNG heater 6 and additional working medium circulation electric power generation
Unit, 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 tube
To absorb LNG cold energy, the cold end 3 of cold energy Stirling generating set is also connect with low temperature Brayton cycle cold energy generation system on road,
The hot end 4 of cold energy Stirling device connects external heat source, and LNG gas phase pipeline is respectively communicated with the cold end 3 in cold energy Stirling device
With LNG heater 6 the gas phase natural gas of the cold end 3 of cold energy Stirling device is transmitted to LNG heater 6, LNG heater 6
Output end be connected to the transmission end of natural gas.Specifically, the transmission end of natural gas can prize tank for pipe natural gas or natural gas
Vehicle.
Low temperature Brayton cycle cold energy generation system includes heater 11, heat exchanger 10, turbine 8,9 and of turbogenerator
Compressor 13, heat exchanger 10 pass through the cold end 3 of LNG gas phase pipeline and cold energy Stirling generating set, compressor 13, turbine respectively
Machine 8 and LNG heater 6 connect, and heater 11 is connect with turbine 8 and compressor 9 respectively, and turbine 8 and turbogenerator 9 connect
It connects.Specifically, heat exchanger 10 is condenser.The cycle fluid of low temperature Brayton cycle cold energy generation system is nitrogen.Nitrogen exists
Entire low temperature Bretton follows badly without phase-change.
As shown in Fig. 2, the work step of embodiment 2 is as follows:
S1-170 DEG C~-150 DEG C liquid phase LNG are transmitted to the power generation of cold energy Stirling by LNG liquid phase pipeline from LNG storage tank 1
The cold end 3 of device, 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, 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.
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 13 again further to compress, gas phase natural gas is pressed by the heating of heater heat source 12 of heater 11 through turbine 8
It shortens into as pressure high temperature hot gas, drives turbine 8 to drive turbogenerator 9 to do work, turbine 8 is that condenser 10 provides
Kinetic energy, the gas phase natural gas more than needed being discharged from turbine 8 are circulated back to condenser 10.Compressor 13 can reach identical pressurization
Turbine wasted work is reduced than in the case of.
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, reaches 29 DEG C by the heating of LNG heater heat source 7 and meets pipe natural gas or natural gas sled tank
After the temperature, pressure of vehicle requires, gas pipeline is transmitted to for using.
As shown in figure 3, 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.
Above-mentioned LNG cold energy Stirling power generation couples the cold energy application cooling capacity and power generation of additional working medium circulation electric power generation machine set system
Amount meets following calculation formula:
1. cold energy use and off-energy balanced type:
Stirling generator couples Rankine cycle power generation:
QAlways=FLNG*(TFor-T0)*CpLNG=QStirling+QHeater+QRankine
The power generation of stirling generator coupled low temperature Brayton cycle:
QAlways=FLNG*(TFor-T0)*CpLNG=QStirling+QHeater+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
LNG heater radiation loss QHeater=Q1+Q2+…+Qn
2. cold energy use generated energy calculating formula:
Stirling generator couples Rankine cycle power generation:
PAlways=PStirling+PRankine
The power generation of stirling generator coupled low temperature Brayton cycle:
PAlways=PStirling+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=FWorking 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 QRankineOr
QBraytonIt determines.
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 couples additional working medium circulation electric power generation machine set system, which is characterized in that stored up including LNG
Tank, LNG liquid phase pipeline, LNG gas phase pipeline, cold energy Stirling generating set, LNG heater and additional working medium circulation electric power generation machine
Group, 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 with
LNG cold energy is absorbed, the cold end of cold energy Stirling generating set is also connect with additional working medium circulation electric power generation unit, 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, and the output end of LNG heater is connected to natural gas
Transmission end.
2. LNG cold energy Stirling power generation according to claim 1 couples additional working medium circulation electric power generation machine set system, feature
It is, the additional working medium circulation electric power generation unit is Rankine cycle cold energy generation system, and Rankine cycle cold energy generation system includes
Heater, heat exchanger, turbine and turbogenerator, heat exchanger pass through LNG gas phase pipeline and heater, turbine, cold respectively
The cold end of energy Stirling generating set is connected with LNG heater, and turbine is connect with heater and turbogenerator respectively.
3. LNG cold energy Stirling power generation according to claim 2 couples additional working medium circulation electric power generation machine set system, feature
It is, the cycle fluid of the Rankine cycle cold energy generation system is propane, ammonia, propylene, any one in tetrafluoroethane.
4. LNG cold energy Stirling power generation according to claim 1 couples additional working medium circulation electric power generation machine set system, feature
It is, the additional working medium circulation electric power generation unit is low temperature Brayton cycle cold energy generation system, low temperature Brayton cycle cold energy
Electricity generation system includes heater, heat exchanger, turbine, turbogenerator and compressor, and heat exchanger passes through LNG gas phase pipeline respectively
Connect with the cold end of cold energy Stirling generating set, compressor, turbine and LNG heater, heater respectively with turbine and
Compressor connection, turbine are connect with turbogenerator.
5. LNG cold energy Stirling power generation according to claim 4 couples additional working medium circulation electric power generation machine set system, feature
It is, the cycle fluid of the low temperature Brayton cycle cold energy generation system is nitrogen.
6. LNG cold energy Stirling power generation according to claim 1 couples additional working medium circulation electric power generation machine set system, feature
It is, heat exchange coil is equipped in the cold end of the cold energy Stirling generating set.
7. LNG cold energy Stirling power generation according to claim 6 couples additional working medium circulation electric power generation machine set system, feature
Be, the heat exchange coil is connected to the gas working dielectric pipeline of cold energy Stirling generating set, for from LNG liquid-phase tube
Road and come liquid phase LNG heat exchange.
8. LNG cold energy Stirling power generation according to claim 7 couples additional working medium circulation electric power generation machine set system, feature
It is, the gas working dielectric of the cold energy Stirling generating set is also to be able to maintain gaseous gas at -170 DEG C or less.
9. LNG cold energy Stirling power generation according to claim 1 couples additional working medium circulation electric power generation machine set system, feature
It is, heat source used in the hot end of the cold energy Stirling generating set is seawater, surface water, air, fume afterheat, industrial exhaust heat
In any one.
10. LNG cold energy Stirling power generation according to claim 1 couples additional working medium circulation electric power generation machine set system, special
Sign is, the heat source of the LNG heater is seawater, surface water, air, fume afterheat, any one in industrial exhaust heat.
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| CN201821852591.5U CN208982183U (en) | 2018-11-12 | 2018-11-12 | The power generation of LNG cold energy Stirling couples additional working medium circulation electric power generation machine set system |
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| CN201821852591.5U CN208982183U (en) | 2018-11-12 | 2018-11-12 | The power generation of LNG cold energy Stirling couples additional working medium circulation electric power generation machine set system |
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