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CN111852601A - LNG cold energy CO2Working medium circulation power generation system and power generation method - Google Patents

LNG cold energy CO2Working medium circulation power generation system and power generation method Download PDF

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Publication number
CN111852601A
CN111852601A CN201910342318.0A CN201910342318A CN111852601A CN 111852601 A CN111852601 A CN 111852601A CN 201910342318 A CN201910342318 A CN 201910342318A CN 111852601 A CN111852601 A CN 111852601A
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lng
working medium
heater
power generation
heat
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杨豫森
崔华
陈辉
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Hep Energy And Environment Technology Co ltd
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Hep Energy And Environment Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F01K27/02—Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F17C9/04—Recovery of thermal energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F17C2227/0318—Water heating using seawater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/039—Localisation of heat exchange separate on the pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/07—Generating electrical power as side effect

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention provides LNG cold energy CO2The working medium circulation power generation system comprises an LNG storage tank, an LNG gas-liquid pipeline, an LNG heater, an outlet of the LNG storage tank is connected with the LNG heater through the LNG gas-liquid pipeline, an output end of the LNG heater is communicated with a conveying end of natural gas, and the system further comprises cold energy CO2Working medium circulation power generation device, cold energy CO2A condenser is arranged in the working medium circulation power generation device, the condenserLNG and CO are realized by coupling LNG gas-liquid pipeline and condenser2And (4) heat exchange between working media. LNG cold energy CO of the invention2The working medium circulation power generation system realizes CO by utilizing LNG cold energy and external low-quality heat source2The working medium is condensed, liquefied and heated and gasified to carry out Rankine cycle power generation, and meanwhile, low-quality LNG cold energy is used for power generation, so that the utilization rate of the LNG cold energy is improved, and a low-quality heat source can be reused.

Description

LNG cold energy CO2Working medium circulation power generation system and power generation method
Technical Field
The invention relates to the field of Liquefied Natural Gas (LNG), in particular to an LNG cold energy utilization power generation system and a power generation method.
Background
Natural gas, as one of the three major fossil energy sources, is increasingly used in civilian and industrial applications due to its high efficiency and cleanliness. China is a country with large energy demand, and with the development of society and economy, natural gas occupies an increasingly important position in an energy structure when petroleum and coal cannot meet the increasing energy demand of people. But limited to transportation, ocean-going transactions are typically conducted in the form of Liquefied Natural Gas (LNG). LNG is a low-temperature liquid at minus 162 ℃ which is prepared by purifying and liquefying natural gas, and the electric energy consumed in the production process is as high as 850 kWh/t. Whereas LNG must be gasified before use by an end user, and a large amount of cold energy is released during the gasification of LNG in view of a large temperature difference between its storage temperature and the atmospheric environment, and it is theoretically estimated that the released cold energy is about 850kJ/kg, and if this part of cold energy is recovered for power generation, a power output of 240kWh/t can be obtained, so that LNG cold power generation has a great value.
In the prior art, LNG cold energy is mainly used for power generation by a direct expansion method or a secondary medium Rankine cycle method. For example, the chinese patent with application number 201711312743.2 provides a system for generating power and supplying cold by comprehensively utilizing LNG cold energy, which comprises an LNG pressure-increasing gasification direct expansion power generation system, a mixed working medium rankine cycle power generation system, a liquid ammonia refrigerator cooling system, and an ethylene glycol ice storage tank air conditioner cooling circulation system; the high-grade electric energy is produced by utilizing cold energy released in the LNG gasification process, adopting LNG pressurization gasification direct expansion power generation and mixed working medium Rankine cycle power generation. If chinese patent application No. 201710849459.2 again, realized utilizing step by step to the LNG cold energy, wherein the membrane separation device who adds can make regulation and control to the ratio of mixing medium in two condensers, can further promote the temperature matching degree of heat transfer process, reduces the irreversible loss of LNG cold energy recovery process.
However, the above prior art and methods have the disadvantages of low power generation efficiency and complex system and equipment structure, and the expansion method is only suitable for the working condition with high-pressure LNG and cannot be used for a low-pressure LNG system.
LNG cold energy utilization and CO for gas-fired power plants using LNG as fuel 2The integration of emission reduction and liquefaction has great attraction. On the one hand, the LNG is used as a cold source, so that CO can be easily obtained2The low temperature required for liquefaction, with CO also being produced2The liquefaction pressure is reduced to below 0.9MPa from 2.0-3.0 MPa of the traditional process, so that the energy consumption of a compressor and refrigeration equipment is greatly reduced by about 40%. And CO2Is an excellent Rankine power generation cycle working medium, CO2The supercritical state is achieved at a temperature of 31.09 and a pressure of 7.39MPa or more, so that CO can be easily realized in a Rankine cycle2The supercritical state enters a turbine (turbine) to generate electricity efficiently.
Disclosure of Invention
Aiming at the defects of the prior art, the invention mainly aims to realize CO by utilizing LNG cold energy and external low-quality heat source2And the working medium is condensed, liquefied and gasified, so that high-efficiency Rankine cycle power generation is achieved. Another object of the present invention is to generate electricity by further using low-quality LNG cold energy.
In order to achieve the purpose, the invention adopts the following technical scheme:
LNG cold energy CO2The working medium circulation power generation system comprises an LNG storage tank, an LNG gas-liquid pipeline, an LNG heater and cold energy CO2The outlet of the LNG storage tank is connected with an LNG heater through an LNG gas-liquid pipeline, the LNG heater is connected with a heating heat source, the output end of the LNG heater is communicated with the conveying end of natural gas, and cold energy CO is generated 2A condenser and a first heater are arranged in the working medium circulation power generation device, the condenser and the first heater are arranged in the working medium circulation power generation deviceCO realization by coupling LNG gas-liquid pipeline and condenser2Cooling contraction of working medium, and connecting the first heater with a heating heat source to realize CO2And (4) heating and expanding the working medium.
Further, the LNG heater comprises a second heater and a third heater.
Further, the LNG cold energy CO2The working medium circulation power generation system is also provided with an expander and a power generator, the third heater is sequentially connected with the expander and the second heater in series, and the expander applies work through expansion of LNG cold energy to drive the connected power generator to generate power.
Further, the cold energy CO2The working medium circulation power generation device also comprises a working medium pump, a turbine and a first power generator, wherein the condenser, the working medium pump, the first heater and the turbine are sequentially connected to form CO2Rankine cycle of a working medium, said turbine passing a working medium CO2To drive the connected first generator to generate electricity.
Furthermore, the heating heat source is any one of outdoor air, seawater, river water, underground water, flue gas waste heat and industrial waste heat.
Still further, the flue gas waste heat is any one of flue gas discharged by a pulverized coal boiler, flue gas discharged by a gas turbine or an internal combustion engine, and flue gas discharged by a gas turbine waste heat boiler.
Still further, the industrial waste heat is any one of steam turbine exhaust or extraction, condenser circulating water waste heat, internal combustion engine cylinder sleeve water waste heat and steam waste heat produced by a pulverized coal boiler.
Further, said CO2The working medium is converted from liquid state to overheat state in the first heater, and enters the turbine to do work, and the CO after doing work2The working medium exchanges heat with LNG cold energy in the condenser and then is converted into liquid state for circulation.
LNG cold energy CO2The power generation method of the working medium circulation power generation system is realized by carrying out power generation on CO2Precise control of the temperature and pressure of the working fluid and energy balance, wherein CO2The temperature and pressure control of (1) comprises:
s1, according to the temperature T of LNG entering the condenserLNGSetting the absolute pressure P in the condenserCO2Ensuring CO2The working medium is converted into liquid after heat exchange by the condenser and cannot be converted into solid dry ice;
s2, liquid CO at outlet of condenser2Boosting the pressure to be more than 7.390Mpa by a working medium pump;
s3 liquid CO2The heat absorption and temperature rise are carried out in the first heater, the temperature is raised to be over 31.06 ℃ of the supercritical temperature, and the heat absorption and temperature rise enters a turbine in a supercritical overheat state to do work and generate power through expansion.
Further, the calculation formula related to the power generation method includes:
Cold energy utilization and loss energy balance:
Qgeneral assembly＝QLatent heat of LNG+QGas temperature rise＝FLNG*qLatent heat of LNG+FLNG*(TFor supplying to-T1)*Cp gas＝QRankine+QHeater，
QRankine＝FLNG*(T3-T2)*CpLNG
QHeater＝Q1+Q2+…+Qn
Wherein: qGeneral assemblyThe total energy of the available cold energy is kJ/h; qLatent heat of LNGIs LNG potential available cold energy, kJ/h; qGas temperature risekJ/h is the energy for LNG gasification and temperature rise; fLNGThe LNG flow is kg/h; q. q.sLatent heat of LNGThe gasification latent heat kJ/kg of LNG; cp gasThe unit is the specific heat capacity kJ/kg of natural gas; t isFor supplying toThe temperature of the externally supplied natural gas is DEG C; t is1The temperature after LNG vaporization is DEG C; t is3The temperature, DEG C, T, of LNG flowing out of the condenser2The temperature of the LNG entering the condenser is DEG C; qRankineIs CO2The total utilization amount of working medium Rankine cycle cold energy is kJ/h; qHeaterAbsorbing heat for an LNG heater, kJ/h; q1The heat provided by the heating heat source No. 1 is kJ/h; q2Heat provided for the No. 2 heating heat source, kJ/h; qnHeating for the n-thHeat provided by the source, kJ/h; cpLNGThe unit is the specific heat capacity kJ/kg ℃ of the liquid LNG.
2)CO2Heat absorption of the working medium in the first heater:
Qabsorbing heat＝FAir (a)*(TInto-TGo out)*Cp air＝FSeawater, its production and use*(TInto-TGo out)*Cp sea water＝FFlue gas* (TInto-TGo out)*CP flue gas＝FCirculating water*(TInto-TGo out)*CP circulating water
QAbsorbing heatIs CO2Heat absorption of working medium in the first heater, kJ/h, FAir (a)、FSeawater, its production and use、FFlue gas、FCirculating water The circulation flow rates of air, seawater, flue gas and circulating water in the first heater are kg/h respectively; cp air、Cp sea water、CP flue gas、CP circulating waterThe specific heat capacities of air, seawater, flue gas and circulating water are respectively kJ/kg ℃; t isIntoThe inlet temperature of a heating source in the first heater is DEG C; t isGo outThe outlet temperature of a heating source in the first heater is DEG C;
3)CO2working medium Rankine cycle power generation amount: pRankine＝FCO2*QAbsorbing heat*ηR*ηe＝FCO2* QAbsorbing heat*(1-T4’/T5’)*ηe
In the formula, PRankineIs CO2Working medium Rankine cycle power generation amount, kw; fCO2Is CO2Working medium circulation flow rate, kg/h; etaRIs CO2Thermal efficiency, η, of working medium Rankine cycleeFor generator efficiency, QAbsorbing heatIs CO2Heat absorption of working medium in the first heater, kJ/h, T5’Is the average endothermic temperature, DEG C, T4’Is the average exothermic temperature, DEG C, T5’From CO2The heat absorption Q of the working medium in the first heater (3)Absorbing heatDetermination of T4’Total amount of cold energy utilization Q by Rankine cycleRankineAnd (6) determining.
The invention has the beneficial technical effects that:
(1) the cold energy and CO of LNG are realized by coupling the LNG gas-liquid pipeline with the condenser2Heat exchange between working media and high vacuum in condenser, and further liquid CO is utilized2Performing a Rankine cycle to generate power efficiently;
(2) the low quality of outdoor air, seawater, river water, underground water, flue gas waste heat, industrial waste heat and the like is used as an external heat source CO of the first heater 2Heating the working medium to increase CO2Into the power generation capacity within the turbine.
(3) The LNG heater and the third heater are heated by using the flue gas discharged by the pulverized coal boiler of the power station, the flue gas discharged by the gas turbine or the internal combustion engine and the flue gas discharged by the waste heat boiler of the gas turbine, and the CO in the flue gas is cooled2Can further liquefy supplemented CO2Working medium, and further part of CO in flue gas generated by gas or coal-fired power station2And (4) recycling.
Drawings
FIG. 1 shows a LNG cold energy CO of the present invention2A schematic diagram of a working medium circulation power generation system;
FIG. 2 shows LNG cold energy CO in example 2 of the present invention2A schematic diagram of a working medium circulation power generation system;
FIG. 3 shows LNG cold energy CO in example 3 of the present invention2A schematic diagram of a working medium circulation power generation system;
FIG. 4 shows LNG cold energy CO in example 4 of the present invention2A schematic diagram of a working medium circulation power generation system;
FIG. 5 is a diagram of the temperature-pressure curve of carbon dioxide and the supercritical fluid state;
fig. 6 is a graph of the temperature enthalpy status of LNG versus pressure.
Description of the reference numerals
LNG storage tank-1, condenser-2, first heater-3, turbine-4, first generator-5, LNG heater-6, second heater-7, third heater-8, expander-9, generator-10, cold energy CO 2Working medium circulation power generation device-11, working medium pump-12 and LNG gas-liquid pipeline-13
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the following examples are provided to illustrate the detailed embodiments and specific operations based on the technical solutions of the present invention, but the scope of the present invention is not limited to the examples.
Example 1
As shown in figure 1, a LNG cold energy CO2The working medium circulation power generation system comprises an LNG storage tank 1, an LNG gas-liquid pipeline 13, an LNG heater 6 and cold energy CO2Working medium circulation power generation device 11, LNG gas-liquid pipeline 13 and cold energy CO2Working medium circulation power generation device 11 is coupled to realize LNG and CO2And (3) heat exchange between working media, wherein an outlet of the LNG storage tank 1 is connected with the LNG heater 6 through an LNG gas-liquid pipeline 13, and an output end of the LNG heater 6 is communicated with a transmission end of natural gas. Preferably, the LNG cold energy CO2The working medium circulation power generation system further comprises an expansion machine 9 and a power generator 10, wherein the expansion machine 9 is connected with the LNG heater 6 and the power generator 10 respectively. The LNG becomes high-pressure normal-temperature gas after passing through the LNG heater 6, and then enters the expander 9 to be expanded, so as to drive the generator 9 to generate power.
The cold energy CO2The working medium circulation power generation device 11 comprises a condenser 2, a working medium pump 12, a first heater 3, a turbine 4 and a first power generator 5, wherein the condenser 2, the working medium pump 12, the first heater 3 and the turbine 4 are sequentially connected to form Rankine cycle, and CO is 2The working medium is converted from liquid state to overheat state in the first heater 3, and enters the turbine 4 to expand and do work, and the CO after doing work2The working medium exchanges heat with LNG cold energy in the condenser 2 and then is converted into a liquid state to be circulated through the working medium pump 12; the first generator 5 is connected to the turbine 4 for generating electricity. The cold energy CO2Working medium circulation power generation device 11 according to CO2The temperature and state of working medium are divided into 2 regions of cold end and hot end, and the temperature difference between cold end and hot end is used to produce CO2The cooling compression and the heat absorption expansion of the working medium drive the first generator 5 to generate electricity. The condenser 2 is at the cold end, the first additionThe heater 3 is located at the hot end. As preferred, the cold junction is equipped with the heat transfer coil who low temperature resistant material was prepared, heat transfer coil establishes in condenser 2, and heat transfer coil communicates in cold energy CO2And a medium pipeline of the working medium circulation power generation device 11 is used for exchanging heat with liquid-phase LNG from the LNG gas-liquid pipeline 13. The liquid-phase LNG is evaporated outside the heat exchange coil to become low-temperature gas-phase natural gas. The heat source of the first heater 3 is any one of outdoor air, seawater, river water, underground water, flue gas waste heat and industrial waste heat. Preferably, the heat source of the first heater 3 is derived from boiler exhaust gas or gas turbine exhaust gas.
Specifically, LNG in the LNG storage tank 1 is delivered into the LNG heater 6 through the LNG gas-liquid pipeline 13 to be heated, and the natural gas after temperature rise and gasification is output through a natural gas delivery end. Preferably, the delivery end of the natural gas can be a natural gas pipeline or a natural gas skid-mounted tanker. The LNG gas-liquid pipeline 13 comprises an LNG liquid phase pipeline and an LNG gas phase pipeline which are made of low-temperature-resistant materials. At the same time, the LNG gas-liquid pipeline 13 is coupled with the condenser 2 to heat up CO2The working medium absorbs the LNG cold energy to be cooled and liquefied, and is converted into an overheated state after absorbing heat by the first heater 3, and the overheated state is CO2Enters the turbine 4 to do work, and then drives the first generator 5 to generate electricity.
The LNG storage tank 1 is used to store liquid LNG, which is a Liquid Natural Gas (LNG) obtained by compressing and cooling a natural gas to a boiling temperature thereof, and generally, the storage conditions of the liquefied natural gas are about-170 ℃ to-150 ℃ and about 0.1 MPa.
The LNG heater 6 is connected to an external heat source for heating the LNG. Preferably, the LNG heater 6 includes a second heater 7 and a third heater 8 which are connected in series, and performs a gradient temperature rise on the LNG. The external heat source comprises any one of outdoor air, seawater, river water, underground water, flue gas waste heat and industrial waste heat. The flue gas waste heat is any one of flue gas discharged by a pulverized coal boiler of a power station, flue gas discharged by a gas turbine or an internal combustion engine and flue gas discharged by a waste heat boiler of the gas turbine. The industrial waste heat is any one of the exhaust steam or extraction steam of a steam turbine of a power station, the waste heat of circulating water of a condenser of the power station, the waste heat of cylinder sleeve water of an internal combustion engine and the waste heat of steam produced by a waste heat boiler. Preferably, the heat source of the second heater 7 is seawater or air, and the heat source of the third heater 8 is turbine exhaust steam, extraction steam or condenser circulating water.
As shown in fig. 5 and 6, the approximate value of the LNG cold is quickly inquired through the change curve graph of the LNG cold and the temperature and the pressure of the LNG, but the accurate cold technology needs to be calculated according to the following calculation formula.
LNG cold energy CO2The power generation method of the working medium circulation power generation system is characterized in that the power generation method is realized by carrying out CO (carbon monoxide) treatment on CO2Precise control of the temperature and pressure of the working fluid and energy balance, wherein CO2The temperature and pressure control of (1) comprises:
s1, according to the temperature T of LNG entering the condenser 2LNGSetting the absolute pressure P in the condenser 2CO2Ensuring CO2The working medium is converted into liquid after heat exchange by the condenser 2 and is not converted into solid dry ice;
s2, liquid CO at outlet of condenser2Boosting the pressure to be above 7.390Mpa by a working medium pump 12;
s3 liquid CO2The heat is absorbed by the first heater 3 and the temperature is raised to the supercritical temperature of above 31.06 ℃, and the heat enters the turbine 4 in a supercritical overheat state to do work and generate power.
The calculation formula related to the power generation method comprises the following steps:
cold energy utilization and loss energy balance:
Qgeneral assembly＝QLatent heat of LNG+QGas temperature rise＝FLNG*qLatent heat of LNG+FLNG*(TFor supplying to-T1)*Cp gas＝QRankine+QHeater，
QRankine＝FLNG*(T3-T2)*CpLNG
QHeater＝Q1+Q2+…+Qn
Wherein: qGeneral assemblyThe total energy of the available cold energy is kJ/h; qLatent heat of LNG Is LNG potential available cold energy, kJ/h; qGas temperature risekJ/h is the energy for LNG gasification and temperature rise; fLNGThe LNG flow is kg/h; q. q.sLatent heat of LNGThe gasification latent heat kJ/kg of LNG; cp gasThe unit is the specific heat capacity kJ/kg of natural gas; t isFor supplying toThe temperature of the externally supplied natural gas is at DEG C; t is1The temperature after LNG vaporization is DEG C; t is3The temperature, DEG C, T, of LNG flowing out of the condenser2The temperature of the LNG entering the condenser 2 is deg.c; qRankineIs CO2The total utilization amount of working medium Rankine cycle cold energy is kJ/h; qHeaterHeat absorption for the LNG heater 6, kJ/h; (ii) a Q1The heat provided by the heating heat source No. 1 is kJ/h; q2Heat provided for the No. 2 heating heat source, kJ/h; qnThe heat quantity provided for the nth heating heat source is kJ/h; cpLNGThe unit is the specific heat capacity kJ/kg ℃ of the liquid LNG.
2)CO2Heat absorption of the working medium in the first heater 3: qAbsorbing heat＝FAir (a)*(TInto-TGo out) *Cp air＝FSeawater, its production and use*(TInto-TGo out)*Cp sea water＝FFlue gas*(TInto-TGo out)*CP flue gas＝FCirculating water*(TInto-TGo out)*CP circulating water
QAbsorbing heatIs CO2Heat absorption of the working medium in the first heater 3, kJ/h, FAir (a)、FSeawater, its production and use、 FFlue gas、FCirculating waterThe circulation flow of air, seawater, flue gas and circulating water in the first heater 3 is kg/h; cp air、Cp sea water、CP flue gas、CP circulating waterThe specific heat capacities of air, seawater, flue gas and circulating water are respectively kJ/kg ℃; t is IntoIs the inlet temperature of the heating source in the first heater 3, DEG C; t isGo outIs the outlet temperature of the heating source in the first heater 3, DEG C;
3)CO2working medium Rankine cycle power generation amount:
PRankine＝FCO2*Qabsorbing heat*ηR*ηe
＝FCO2*QAbsorbing heat*(1-T4’/T5’)*ηe
In the formula, PRankineIs CO2Working medium Rankine cycle power generation amount, kw; fCO2Is CO2Working medium circulation flow rate, kg/h; etaRIs CO2Thermal efficiency, η, of working medium Rankine cycleeFor generator efficiency, QAbsorbing heatIs CO2Heat absorption of the working medium in the first heater 3, kJ/h, T5’Is the average endothermic temperature, DEG C, T4’Is the average exothermic temperature, DEG C, T5’From CO2The heat absorption Q of the working medium in the first heater (3)Absorbing heatDetermination of T4’Total amount of cold energy utilization Q by Rankine cycleRankineAnd (6) determining.
Example 2
As shown in fig. 2, LNG cold energy CO is used2The working medium power generation system is coupled with a gas or coal-fired thermal power generation system, and the gas or coal-fired thermal power generation system also comprises a coal-fired boiler, a steam turbine, a condenser and a generator; when the coal-fired unit generates electricity, water enters the coal-fired boiler after being preheated so as to generate high-pressure steam, and the high-pressure steam enters the steam turbine to convert the heat energy of the high-pressure steam into kinetic energy so as to drive the generator to generate electric energy. Meanwhile, the flue gas generated by the pulverized coal fired boiler enters the first heater 3, and the waste heat of the flue gas is utilized to remove CO 2The working medium is heated to the supercritical temperature, and the condenser 2 realizes CO by utilizing LNG cold energy2Low pressure (high vacuum) condensation liquefaction; CO in high-temperature flue gas2Cooling and liquefying to obtain CO2And supplementing the working medium.
And in LNG cold energy CO2In the working medium power generation system, on the one hand, the CO2The working medium is cooled and liquefied after exchanging heat with LNG in the condenser 2, enters the first heater 3 through the working medium pump 12, is heated by high-temperature flue gas generated by the pulverized coal boiler, and enters the turbine 4 to do work, so that the first engine 5 is driven to generate power; on the other hand, the LNG heated by heat exchange sequentially enters the third heater 8, the expander 9 and the second heater 7 through the LNG gas-liquid pipeline 13 to be subjected to gradient heatingThe temperature is increased to be converted into gaseous natural gas, the heat source of the second heater 7 is seawater, the heat source of the third heater 8 is circulating hot water of a condenser, the LNG enters an expander 9 to do work through expansion after being heated by the second heater 7, and the expander 9 drives a generator 10 to generate power.
Specifically, in this embodiment, the LNG cold energy CO2The working medium power generation system comprises the following steps:
s1, delivering the liquid LNG from the LNG storage tank 1 to the CO through the LNG gas-liquid pipeline 132Outside a heat exchange coil at the cold end of the working medium circulation power generation device 11, the temperature of the liquid LNG is-170 ℃ to-150 ℃, and preferably, the temperature of the liquid LNG is-150 ℃;
S2, heating the liquid LNG outside the heat exchange coil to vaporize the LNG into low-temperature natural gas, and cooling the working medium inside the heat exchange coil by the low-temperature natural gas; CO after simultaneous heat exchange2The working medium enters cold energy CO through the working medium pump 122The hot end of the working medium circulation generating set 11 and the first heater 3 are cold energy CO2CO of working medium circulation power generation device 112Working medium provides heat, and CO is generated by utilizing temperature difference between cold end and hot end2Cooling compression and heat absorption expansion of the working medium drive the turbine 4 to move, so that power is output to drive the first generator 5 to generate electricity, and the temperature of the low-temperature natural gas is-35 ℃;
s3, vaporizing the heated liquid-phase LNG into low-temperature gas-phase natural gas at-35 ℃ from cold energy CO2The cold end of the working medium circulation generating set 11 discharges and transmits to the LNG heater 6 through the LNG gas-liquid pipeline 13, and the LNG heater 6 heats the LNG and transmits to the gas transmission pipeline for use after reaching the 29 ℃ requirement.
Example 3
LNG cold energy CO as shown in FIG. 32The working medium circulation power generation system is coupled with the coal-fired thermal power generation system, and the first heater 3 utilizes the steam extraction or steam exhaust of the steam turbine or the waste heat of the circulating water to CO2The working medium is heated to the supercritical temperature or the critical temperature, the first heater 3 is preferably used for heating by using steam extraction of a steam turbine, and the condenser realizes CO by using LNG cold energy 2Is liquefied by condensation at a low pressure (high vacuum).
The CO is2The working medium is cooled and liquefied after exchanging heat with LNG in the condenser 2, enters the first heater 3 through the working medium pump 12, is heated by using the extraction steam or exhaust steam of a steam turbine or the waste heat of circulating water, and enters the turbine 4 to do work, so as to drive the first engine 5 to generate electricity; meanwhile, LNG subjected to heat exchange and temperature rise sequentially enters a third heater 8, an expander 9 and a second heater 7 through an LNG gas-liquid pipeline 13 to be subjected to gradient heating and temperature rise so as to be converted into gaseous natural gas, a heat source of the second heater 7 is air, and a heat source of the third heater 8 is circulating hot water generated by a condenser or exhaust steam of a steam turbine.
Specifically, in this embodiment, the LNG cold energy CO2The working medium power generation system comprises the following steps:
s1, liquid LNG at-170 ℃ to-150 ℃ is transmitted from the LNG storage tank 1 to cold energy CO through the LNG gas-liquid pipeline 132The cold end of the working medium circulation power generation device 11 is preferably selected, and the temperature of the liquid-phase LNG is-170 ℃;
s2, the liquid LNG is heated outside the heat exchange coil pipe to be vaporized into low-temperature natural gas, and the low-temperature natural gas cools the working medium CO circulating inside the heat exchange coil pipe2(ii) a CO after simultaneous heat exchange2The working medium enters cold energy CO through the working medium pump 122The hot end of the working medium circulation generating set 11 and the first heater 3 are cold energy CO 2CO of working medium circulation power generation device 112Working medium provides heat, and CO is generated by utilizing temperature difference between cold end and hot end2Cooling compression and heat absorption expansion of the working medium drive the turbine 4 to move, so that power is output to drive the first generator 5 to generate electricity, and the temperature of the low-temperature natural gas is-35 ℃;
s3, vaporizing to-35 ℃ low-temperature gas-phase natural gas from cold energy CO2The cold end of the working medium circulation power generation device 11 is discharged, the cold end is transmitted to a third heater 8 through an LNG (liquefied natural gas) gas-liquid pipeline 13, the cold end is heated by the third heater 8 into 24 ℃ high-pressure gas, the high-pressure gas enters an expansion machine 9, the gas is cooled strongly because the gas-phase natural gas performs adiabatic expansion in the expansion machine 9 and does work externally to consume the internal energy of the gas, and the temperature of the gas-phase natural gas is suddenly reduced to-10 ℃;
and the gas-phase natural gas at the temperature of S4 and 10 ℃ is transmitted to the second heater 7 through the LNG gas-liquid pipeline 13, is heated by the second heater 7 to meet the temperature and pressure requirements of the pipeline natural gas or the natural gas skid-mounted tanker and is transmitted to a gas transmission pipeline for use.
Example 4
LNG cold energy CO as shown in FIG. 42The working medium circulation power generation system is coupled with the gas power generation system, and the first heater 3 utilizes seawater or air to carry out CO (carbon monoxide) treatment2The working medium is heated to the supercritical temperature or the critical temperature, and the condenser utilizes the LNG cold energy to realize CO 2Is liquefied by condensation at a low pressure (high vacuum).
The CO is2The working medium is cooled and liquefied after exchanging heat with LNG in the condenser 2, enters the first heater 3 through the working medium pump 12, is heated by utilizing seawater or air, and enters the turbine 4 to do work, so that the first motor 5 is driven to generate electricity; meanwhile, LNG subjected to heat exchange and temperature rise sequentially enters a third heater 8, an expander 9 and a second heater 7 through an LNG gas-liquid pipeline 13 to be subjected to gradient heating and temperature rise so as to be converted into gaseous natural gas, a heat source of the second heater 7 is seawater or air, a heat source of the third heater 8 is circulating hot water generated by a condenser or exhaust steam of a steam turbine, and the LNG is heated by the third heater 7 and then is transmitted to a gas transmission pipeline for use.
Specifically, in this embodiment, the LNG cold energy CO2The working medium power generation system comprises the following steps:
s1, transferring the liquid LNG with the temperature of-162 ℃ from the LNG storage tank 1 to cold energy CO through the LNG gas-liquid pipeline 132The cold end of the working medium circulation power generation device 11;
s2, after the liquid LNG enters the condenser 2, the liquid LNG and the working medium CO are arranged outside the heat exchange coil of the condenser 22Is heated after heat exchange and vaporized into low-temperature natural gas, and simultaneously, working medium CO circulating in the heat exchange coil2Is cooled and contracted and enters cold energy CO through a working medium pump 12 2The hot end of the working medium circulation generating set 11 and the first heater 3 are cold energy CO2CO of working medium circulation power generation device 112Working medium provides heat, and CO is generated by utilizing temperature difference between cold end and hot end2The cooling compression and the heat absorption expansion of the working medium drive the turbine 4 to move, thereby outputting power to drive the turbineA generator 5 is used for generating electricity, and the temperature of the low-temperature natural gas is-35 ℃;
s3, LNG becomes high-pressure low-temperature gas through the condenser 2, the natural gas at the temperature of minus 35 ℃ is transmitted to the LNG heater 6, the natural gas is heated to be high-pressure gas at the temperature of 24 ℃ through the third heater 8 and then enters the expansion machine 9, the expansion machine 9 utilizes the gas with certain pressure to carry out adiabatic expansion to do work outwards, and the expansion machine 9 drives the generator 10 to generate electricity. The gas itself is cooled down strongly because the gas phase natural gas does work outwards by adiabatic expansion in the expansion machine, thereby leading the temperature of the gas phase natural gas to drop to-10 ℃;
and the gas-phase natural gas at the temperature of S4 and-10 ℃ is transmitted to the second heater 7 through the LNG gas-liquid pipeline 13, and is heated to 29 ℃ by the second heater 7 to meet the temperature and pressure requirements of the pipeline natural gas or the natural gas prying and tank truck, and then is transmitted to the gas transmission pipeline for use.
Working medium CO of LNG cold energy and Rankine cycle is utilized in the embodiment 2Heat exchange is carried out, thereby cold energy is transferred to working medium CO2And then the turbine 4 is driven to operate to drive the first generator 5 to generate electricity, and meanwhile, the low-quality cold energy drives the expansion machine 9 to drive the generator 10 to generate electricity, so that the utilization rate of the cold energy is improved, and meanwhile, the generating efficiency and the generating capacity are also improved.
Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.

Claims (10)

1. LNG cold energy CO2The working medium circulation power generation system is characterized by comprising an LNG storage tank (1), an LNG gas-liquid pipeline (13), an LNG heater (6) and cold energy CO2The working medium circulation power generation device (11), the export of LNG storage tank (1) passes through LNG gas-liquid pipeline (13) and links to each other with LNG heater (6), LNG heater (6) link to each other with the heating heat source, the output of LNG heater (6) communicates in the conveying end of natural gas, cold energy CO2A condenser (2) and a first heater (3) are arranged in the working medium circulation power generation device (11), and the LNG gas-liquid pipeline (13) and the condenser are connectedCO is realized by coupling the devices (2)2Cooling contraction of working medium, and the first heater (3) is connected with a heating heat source to realize CO 2And (4) heating and expanding the working medium.
2. LNG cold energy CO according to claim 12The working medium circulation power generation system is characterized in that the LNG heater (6) comprises a second heater (7) and a third heater (8).
3. LNG cold energy CO according to claim 12The working medium circulation power generation system is characterized in that the LNG cold energy CO2The working medium circulation power generation system is further provided with an expansion machine (9) and a power generator (10), the third heater (8) is sequentially connected with the expansion machine (9) and the second heater (7) in series, and the expansion machine (9) applies work through expansion of LNG cold energy to drive the connected power generator (10) to generate power.
4. LNG cold energy CO according to claim 12The working medium circulation power generation system is characterized in that the cold energy CO2The working medium circulation power generation device (11) further comprises a working medium pump (12), a turbine (4) and a first power generator (5), wherein the condenser (2), the working medium pump (12), the first heater (3) and the turbine (4) are sequentially connected to form CO2Rankine cycle of a working medium, the turbine (4) being fed by a working medium CO2To drive the connected first generator (5) to generate electricity.
5. LNG cold energy CO according to claim 12The working medium circulation power generation system is characterized in that the heating heat source is any one of outdoor air, seawater, river water, underground water, flue gas waste heat and industrial waste heat.
6. LNG cold energy CO according to claim 52The working medium circulation power generation system is characterized in that the flue gas waste heat is any one of flue gas discharged by a pulverized coal boiler, flue gas discharged by a gas turbine or an internal combustion engine and flue gas discharged by a gas turbine waste heat boiler.
7. LNG cold energy CO according to claim 52The working medium circulation power generation system is characterized in that the industrial waste heat is any one of steam turbine exhaust or extraction, condenser circulating water waste heat, internal combustion engine cylinder sleeve water waste heat and steam waste heat produced by a pulverized coal boiler.
8. LNG cold energy CO according to claim 42The working medium circulation power generation system is characterized in that the CO2The working medium is converted from a liquid state into a superheated state in the first heater (3), enters the turbine (4) to do work, and the CO after the work is done2The working medium exchanges heat with LNG cold energy in the condenser (2) and then is converted into liquid state for circulation.
9. LNG cold energy CO2The power generation method of the working medium circulation power generation system is characterized in that the power generation method is realized by carrying out CO (carbon monoxide) treatment on CO2Precise control of the temperature and pressure of the working fluid and energy balance, wherein CO2The temperature and pressure control of (1) comprises:
s1, according to the temperature T of LNG entering the condenser (2) LNGSetting the absolute pressure P in the condenser (2)CO2Ensuring CO2The working medium is converted into liquid after heat exchange by the condenser (2) and is not converted into solid dry ice;
s2, liquid CO at outlet of condenser2The pressure is increased to be more than the supercritical pressure 7.390Mpa through a working medium pump (12);
s3 liquid CO2The heat is absorbed and heated by the first heater (3), the temperature is raised to be over 31.06 ℃ of the supercritical temperature, and the heat enters the turbine (4) in a supercritical overheat state to do work and generate power through expansion.
10. LNG cold energy CO according to claim 92The power generation method of the working medium circulation power generation system is characterized in that the related calculation formula of the power generation method comprises the following steps:
1) cold energy utilization and loss energy balance:
Qgeneral assembly＝QLatent heat of LNG+QGas temperature rise＝FLNG*qLatent heat of LNG+FLNG*(TFor supplying to-T1)*Cp gas＝QRankine+QHeater，
QRankine＝FLNG*(T3-T2)*CpLNG
QHeater＝Q1+Q2+…+Qn
Wherein: qGeneral assemblyThe total energy of the available cold energy is kJ/h; qLatent heat of LNGIs LNG potential available cold energy, kJ/h; qGas temperature risekJ/h is the energy for LNG gasification and temperature rise; fLNGThe LNG flow is kg/h; q. q.sLatent heat of LNGThe gasification latent heat kJ/kg of LNG; cp gasThe unit is the specific heat capacity kJ/kg of natural gas; t isFor supplying toThe temperature of the externally supplied natural gas is DEG C; t is1The temperature after LNG vaporization is DEG C; t is3The temperature, DEG C, T, of LNG flowing out of the condenser2The temperature of LNG entering the condenser (2) is DEG C; q RankineIs CO2The total utilization amount of working medium Rankine cycle cold energy is kJ/h; qHeaterHeat is absorbed by the LNG heater (6), kJ/h; q1The heat provided by the heating heat source No. 1 is kJ/h; q2Heat provided for the No. 2 heating heat source, kJ/h; qnThe heat quantity provided for the nth heating heat source is kJ/h; cpLNGThe unit is the specific heat capacity kJ/kg of liquid LNG;
2)CO2heat absorption of the working medium in the first heater (3):
Qabsorbing heat＝FAir (a)*(TInto-TGo out)*Cp air＝FSeawater, its production and use*(TInto-TGo out)*Cp sea water
＝FFlue gas*(TInto-TGo out)*CP flue gas＝FCirculating water*(TInto-TGo out)*CP circulating water
QAbsorbing heatIs CO2The heat absorption capacity of the working medium in the first heater (3), kJ/h, FAir (a)、FSeawater, its production and use、FFlue gas、FCirculating waterRespectively is air,The circulation flow of the seawater, the flue gas and the circulating water in the first heater (3) is kg/h; cp air、Cp sea water、CP flue gas、CP circulating waterThe specific heat capacities of air, seawater, flue gas and circulating water are respectively kJ/kg ℃; t isIntoThe inlet temperature of a heating source in the first heater (3) is DEG C; t isGo outIs the outlet temperature of the heating source in the first heater (3) at DEG C;
3)CO2working medium Rankine cycle power generation amount:
PRankine＝FCO2*Qabsorbing heat*ηR*ηe
＝FCO2*QAbsorbing heat*(1-T4’/T5’)*ηe
In the formula, PRankineIs CO2Working medium Rankine cycle power generation amount, kw; fCO2Is CO2Working medium circulation flow rate, kg/h; etaRIs CO2Thermal efficiency, η, of working medium Rankine cycle eFor generator efficiency, QAbsorbing heatIs CO2The heat absorption capacity of the working medium in the first heater (3), kJ/h, T5’Is the average endothermic temperature, DEG C, T4’Is the average exothermic temperature, DEG C, T5’From CO2The heat absorption Q of the working medium in the first heater (3)Absorbing heatDetermination of T4’Total amount of cold energy utilization Q by Rankine cycleRankineAnd (6) determining.
CN201910342318.0A 2019-04-26 2019-04-26 LNG cold energy CO2Working medium circulation power generation system and power generation method Pending CN111852601A (en)

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