CN110005486B - Zero-carbon-emission combined cooling heating and power generation device based on total heat cycle and working method - Google Patents
Zero-carbon-emission combined cooling heating and power generation device based on total heat cycle and working method Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 38
- 238000010438 heat treatment Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010248 power generation Methods 0.000 title claims description 19
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 112
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 96
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 56
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 56
- 239000007789 gas Substances 0.000 claims abstract description 49
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003546 flue gas Substances 0.000 claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 30
- 239000002918 waste heat Substances 0.000 claims abstract description 23
- 230000005611 electricity Effects 0.000 claims abstract description 14
- 238000011084 recovery Methods 0.000 claims abstract description 14
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical group OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 45
- 239000000243 solution Substances 0.000 claims description 34
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 27
- 238000002485 combustion reaction Methods 0.000 claims description 19
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 2
- 239000001307 helium Substances 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 10
- 239000003345 natural gas Substances 0.000 abstract description 5
- 238000009834 vaporization Methods 0.000 abstract description 3
- 230000008016 vaporization Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- AEDZKIACDBYJLQ-UHFFFAOYSA-N ethane-1,2-diol;hydrate Chemical compound O.OCCO AEDZKIACDBYJLQ-UHFFFAOYSA-N 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
- F01K13/00—General layout or general methods of operation of complete plants
-
- 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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
-
- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- 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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a zero-carbon-emission combined cooling, heating and power device based on total heat cycle and a working method thereof, wherein the device comprises: the system comprises a Brayton cycle system, a heat pump system, a waste heat recovery system and a carbon capture system. LNG cold energy enters a Brayton cycle system to generate electricity, then enters a turbine to generate electricity by a direct expansion method, and finally enters a carbon capture system to liquefy carbon dioxide, so that the cascade utilization of the LNG cold energy is realized. The vaporized natural gas is introduced into a gas turbine to be combusted to drive a generator and a heat pump to work, and waste heat generated by the gas turbine is recovered and then used for supplying heat, generating power or preparing domestic hot water. And after the discharged flue gas is separated, liquefied carbon dioxide by using LNG cold energy, so that low-cost carbon capture is realized. The invention couples LNG vaporization, carbon capture, waste heat recovery and heat pump technology, and realizes zero carbon emission and combined cooling, heating and power.
Description
Technical Field
The invention relates to a zero-carbon-emission combined cooling, heating and power device based on total heat cycle and a working method thereof. Belongs to the field of energy utilization.
Background
In recent years, with the rapid development of the natural gas industry, the efficient utilization of natural gas has become a research hotspot. According to the system, firstly, the cold energy of LNG is divided into steps for reasonable utilization, secondly, how to perfect the waste heat recovery and heat and cold supply parts of the system is considered, and most importantly, the operation elasticity of the system is improved on the premise that the energy stability and continuous supply of the system are ensured, and more LNG vaporization cold energy is taken away by seawater to be wasted, so that the efficient utilization of the energy is undoubtedly the key point. The energy cascade utilization has the advantages that the energy is divided into a plurality of different stages, the optimal matching of gas, electricity, heat and cold is realized, the energy conservation and emission reduction are realized to a greater extent, and the energy cascade utilization has great practical significance for environmental protection.
Researches find that the maximum energy consumption loss of a fuel gas heat supply mode is the waste heat emission of flue gas, so that the flue gas waste heat recovery mode has huge energy-saving potential. And the flue gas after the combustion of the natural gas contains a large amount of water vapor, and the natural gas is not utilized at present and is directly discharged to the environment, so that the emission index of PM 2.5 is promoted to be increased. Therefore, the deep recycling of the waste heat of the flue gas including the latent heat of condensation of the water vapor is of great significance to energy conservation and pollutant emission reduction.
In the prior art, chinese patent publication No. CN207795405U proposes a combined cooling, heating and power generation and organic rankine cycle coupling system for an internal combustion engine. The system comprises a fuel power conversion device and a power generation device connected with the fuel power conversion device; the system also comprises a waste heat recovery and heat exchange device forming a heat exchange cycle with the fuel power conversion device, a refrigeration and heat supply device forming a heat exchange cycle with the waste heat recovery and heat exchange device and an organic Rankine cycle power generation device. After entering the waste heat recovery heat exchange device for heat exchange, the high-temperature cylinder liner water I of the fuel power conversion device becomes low-temperature cylinder liner water II and enters the fuel power conversion device again to form heat exchange circulation. Although the system recycles the waste heat, the Rankine cycle power generation efficiency is low, the flue gas after heat release is directly discharged into the atmosphere, pollution is caused, and how to apply a large amount of cold energy generated by LNG liquefaction is not considered.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and further provides a zero-carbon-emission combined cooling, heating and power generation device based on full heat cycle and a working method.
The invention realizes zero carbon emission and combined cooling, heating and power by coupling the Brayton cycle system, the heat pump system, the waste heat recovery system and the liquefied carbon dioxide system. Through the rational utilization LNG cold energy, provide one kind and can satisfy the cold energy electricity generation, can satisfy again and supply cold heat to the room, can also satisfy the demand that the carbon was caught to the low-cost, improve the utilization efficiency of the energy, reduce the energy resource consumption of system, the economic nature and the feature of environmental protection of the whole operation of promotion system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a zero carbon emission combined cooling heating and power generation device based on full thermal cycle, includes brayton cycle system, waste heat recovery system, carbon capture system and heat pump system four bibliographic categories branch, wherein the brayton cycle system includes: the LNG heat exchanger comprises an LNG pump, a first heat exchanger, a gas compressor, a reheater, a first turbo expander, a first generator, a second turbo expander, a second generator, a three-way valve and a second heat exchanger, wherein the LNG pump is connected with a right lower interface of the first heat exchanger, a right upper interface of the first heat exchanger is connected with a lower interface of the three-way valve, an upper interface of the three-way valve is connected with the second turbo expander, the first turbo expander is connected with a left upper interface of the second heat exchanger, a left lower interface of the first heat exchanger is connected with the gas compressor, the gas compressor is connected with a lower interface of the reheater, an upper interface of the reheater is connected with the first turbo expander, the first turbo expander is connected with the first generator through a shaft, and the second turbo expander is connected with the second generator through a shaft; the waste heat recovery system comprises: the flue gas channel of the gas turbine is connected with the fourth generator, the fourth generator is connected with the third heat exchanger, the left interface of the third heat exchanger is connected with the hot water tank, the left interface of the ninth stop valve is connected with the third heat exchanger, the right interface of the ninth stop valve is connected with the lower interface of the seventh stop valve, the left interface of the tenth stop valve is connected with the third heat exchanger, and the right interface of the tenth stop valve is connected with the lower interface of the eighth stop valve; the carbon capture system includes: the right interface of the separator is connected with the lower interface of the second compressor, and the upper interface of the second compressor is connected with the right interface of the fifth heat exchanger; the heat pump system includes: the clutch is connected with the third generator through a shaft, the clutch is connected with the first compressor through a shaft, the right interface of the first compressor is connected with the lower interface of the condenser, the upper interface of the condenser is connected with the right interface of the throttle valve, the left interface of the throttle valve is connected with the upper interface of the evaporator, the upper left interface of the evaporator is connected with the lower interface of the eighth stop valve, the upper interface of the eighth stop valve is connected with the fan coil, the lower left interface of the evaporator is connected with the right interface of the solution pump, the left interface of the solution pump is connected with the fan coil, and the upper right interface of the condenser is connected with the right interface of the sixth stop valve, the left port of the sixth stop valve is connected with the right port of the solution pump, the right lower port of the condenser is connected with the right port of the fifth stop valve, and the left port of the fifth stop valve is connected with the fan coil.
Furthermore, a circulating working medium is arranged in the Brayton cycle system, and the circulating working medium is nitrogen or helium.
Further, the throttle valve is a capillary tube or an electronic expansion valve.
Further, the fourth generator is a screw expander or a turbine generator.
Furthermore, a circulating working medium is arranged in the heat pump system, and the circulating working medium is ethylene glycol aqueous solution or Freon.
Further, the fifth heat exchanger is provided with a carbon dioxide outlet; an evaporator side water replenishing port is arranged between the third heat exchanger and the tenth stop valve; an evaporator side water outlet is formed between the tenth stop valve and the eighth stop valve; a condenser side water replenishing port is arranged between the second heat exchanger and the second stop valve; and a condenser side water outlet is arranged between the condenser and the fifth stop valve.
Further, a fourth heat exchanger is communicated between the second air compressor and the fifth heat exchanger, one end of the fourth heat exchanger is communicated with the separator, the other end of the fourth heat exchanger is provided with a water outlet, a fourth stop valve is arranged between the sixth stop valve and the solution pump, and a third stop valve is arranged between the fifth stop valve and the fan coil.
Furthermore, the connection adopts pipeline connection.
A working method of a zero-carbon-emission combined cooling, heating and power device based on total heat cycle is divided into the following four working modes according to the difference of the sizes of cooling and heating loads:
(1) the small load cold supply mode t is more than or equal to 25 DEG C
When the required room temperature is more than or equal to 25 ℃, LNG cold energy is used for cooling, and the ninth control valve and the tenth control valve are in a closed state; LNG is conveyed to the first heat exchanger through the LNG pump to exchange heat and raise the temperature, then enters the second turbo expander to do work to supply the second generator to generate power, and after flowing out, the LNG is conveyed to the gas turbine to be combusted after being subjected to heat exchange and temperature rise through the second heat exchanger; the nitrogen is cooled by the first heat exchanger, enters the compressor for pressurization, enters the reheater for preheating, enters the first turbo expander for acting to drive the first generator to generate power, and enters the first heat exchanger again for heat exchange after expansion, so that the cycle is performed; adjusting the clutch to be connected with the third generator, and driving the third generator to generate power by combustion of the gas turbine; high-temperature flue gas generated by the gas turbine drives the fourth generator to generate power, then enters the third heat exchanger together with cylinder liner water to prepare hot water, low-temperature flue gas subjected to heat exchange enters the separator to separate water and carbon dioxide, water enters the fourth heat exchanger through a left outlet of the separator to absorb heat and then is discharged, carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor and then enters the fourth heat exchanger to be cooled, and the cooled carbon dioxide flows through the fifth heat exchanger to be liquefied by the cold energy of LNG and is discharged from the outlet, so that the carbon capture with low cost is realized; the first control valve, the second control valve, the third control valve and the fourth control valve are opened, the fifth control valve, the sixth control valve, the seventh control valve and the eighth control valve are closed, at the moment, the glycol aqueous solution is conveyed to the fan coil by the solution pump after being cooled by the second heat exchanger, the effect of cooling a room is realized, the glycol aqueous solution after heat exchange returns to the second heat exchanger for continuous cooling, and the process is circulated;
(2) the large load cooling mode t is less than 25 DEG C
When the required room temperature is less than 25 ℃, the ninth control valve and the tenth control valve are in a closed state; LNG is conveyed to the first heat exchanger through the LNG pump, enters the second turbo expander to do work after heat exchange and temperature rise for the second generator to generate power, and is conveyed to the gas turbine for combustion after flowing out and subjected to heat exchange and temperature rise through the second heat exchanger; the nitrogen is cooled by the first heat exchanger, enters the compressor for pressurization, enters the reheater for preheating, enters the first turbo expander for acting to drive the first generator to generate power, and enters the first heat exchanger again for heat exchange after expansion, so that the cycle is performed; adjusting the clutch to be connected with the first compressor, wherein the combustion of the gas turbine drives the first compressor to work; high-temperature flue gas generated by the gas turbine drives the fourth generator to generate power, then enters the third heat exchanger together with cylinder liner water to prepare hot water, low-temperature flue gas subjected to heat exchange enters the separator to separate water and carbon dioxide, water enters the fourth heat exchanger through a left outlet of the separator to absorb heat and then is discharged, carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor and then enters the fourth heat exchanger to be cooled, and the cooled carbon dioxide flows through the fifth heat exchanger to be liquefied by the cold energy of LNG and is discharged from the outlet, so that the carbon capture with low cost is realized; the first control valve, the second control valve, the fifth control valve, the sixth control valve, the seventh control valve and the eighth control valve are opened, the third control valve and the fourth control valve are closed, at the moment, the first compressor drives the condenser to work, the glycol water solution cooled by the second heat exchanger enters the condenser to reduce the condensation temperature so as to improve the efficiency of the heat pump system, a water replenishing port and a water outlet are arranged on the side of the condenser, the glycol water solution is changed into low-temperature high-pressure liquid by the condenser, enters the throttling valve to be reduced in pressure, enters the evaporator to be evaporated and absorb heat, and then is conveyed to the fan coil to realize the room cooling effect; when the load of a room is large, an open type circulating system is adopted, so that the overall efficiency of the system is improved;
(3) the small load heat supply mode t is less than or equal to 25 DEG C
When the required room temperature is less than or equal to 25 ℃, the heat is supplied by the waste heat of the internal combustion engine, the LNG is conveyed to the first heat exchanger through the LNG pump, enters the second turbine expander to do work after heat exchange and temperature rise and is supplied to the second generator for power generation, and the LNG flows out, is subjected to heat exchange and temperature rise through the second heat exchanger and is conveyed to the gas turbine for combustion; the nitrogen is cooled by the first heat exchanger, enters the compressor for pressurization, enters the reheater for preheating, enters the first turbo expander for acting to drive the first generator to generate power, and enters the first heat exchanger again for heat exchange after expansion, so that the cycle is performed; at the moment, the seventh control valve, the eighth control valve, the ninth control valve and the tenth control valve are in an open state, the third control valve and the fourth control valve are closed, the clutch is adjusted to be connected with the third generator, and the gas turbine is combusted to drive the third generator to generate electricity; high-temperature flue gas generated by the gas turbine drives the fourth generator to generate power, then the generated power and cylinder liner water enter the third heat exchanger together to prepare hot water, and glycol water solution in the heat pump system is heated by the third heat exchanger and then is conveyed to the fan coil by the solution pump, so that the room temperature rise effect is realized; the low-temperature flue gas after heat exchange enters the separator to separate water and carbon dioxide, the water enters the fourth heat exchanger through a left outlet of the separator to absorb heat and then is discharged, the carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor and then enters the fourth heat exchanger to be cooled, the cooled carbon dioxide flows through the fifth heat exchanger to be liquefied by the cold energy of LNG and is discharged from the outlet, and carbon capture with low cost is realized;
(4) and a large load heating mode t >25 DEG C
When the required room temperature is more than 25 ℃, the ninth control valve and the tenth control valve are in an opening state; LNG is conveyed to the first heat exchanger through the LNG pump, enters the second turbo expander to do work after heat exchange and temperature rise for the second generator to generate power, and is conveyed to the gas turbine for combustion after flowing out and subjected to heat exchange and temperature rise through the second heat exchanger; the nitrogen is cooled by the first heat exchanger, enters the compressor for pressurization, enters the reheater for preheating, enters the first turbo expander for acting to drive the first generator to generate power, and enters the first heat exchanger again for heat exchange after expansion, so that the cycle is performed; adjusting the clutch to be connected with the third generator, and driving the third generator to generate power by combustion of the gas turbine; high-temperature flue gas generated by the gas turbine drives the fourth generator to generate power, then enters the third heat exchanger together with cylinder liner water to prepare hot water, low-temperature flue gas subjected to heat exchange enters the separator to separate water and carbon dioxide, water enters the fourth heat exchanger through a left outlet of the separator to absorb heat and then is discharged, carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor and then enters the fourth heat exchanger to be cooled, and the cooled carbon dioxide flows through the fifth heat exchanger to be liquefied by the cold energy of LNG and is discharged from the outlet, so that the carbon capture with low cost is realized; the first control valve, the second control valve, the seventh control valve and the eighth control valve are closed, the first compressor drives the condenser to work, at the moment, the ethylene glycol water solution heated by the third heat exchanger enters the evaporator to improve the evaporation temperature so as to improve the overall efficiency of the heat pump system, a water replenishing port and a water outlet are formed in the evaporator side, and finally the solution flows through the condenser and is conveyed to the fan coil by the solution pump, so that the room heating effect is realized; when the load of the room is large, an open type circulating system is adopted, and the overall efficiency of the system is improved.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the heat exchange temperature difference of the heat exchanger is reduced by multi-stage heat exchange, and
loss, reduction in equipment size
2. The large-load cold supply and large-load heat supply modes adopt the beginning circulation, and the heat and the cold generated by the heat pump system are utilized to improve the overall efficiency of the heat pump system.
3. The system adopts LNG as a cold source for carbon capture, and carbon dioxide is liquefied and recovered at low cost, so that zero carbon emission of the system is realized.
4. The LNG refrigeration system recovers the cold energy generated by LNG vaporization, adopts two-stage power generation circulation, realizes the gradient utilization of energy, effectively improves the utilization efficiency of the LNG cold energy, reduces the energy waste and protects the environment.
5. The combined heat and power method and the device for cascade utilization of medium-low temperature waste heat provided by the invention can recover the medium-low temperature waste heat to simultaneously generate power and supply heat, realize combined heat and power, do not need to purchase power from a power grid, and reduce the heat supply cost.
Drawings
FIG. 1 is a schematic view of the structural principle of a zero carbon emission combined cooling heating and power generation device based on total heat cycle of the present invention;
in the figure: 1 is a first turbo expander, 2 is a first generator, 3 is a reheater, 4 is a second generator, 5 is a second turbo expander, 6 is a first heat exchanger, 7 is a compressor, 8 is an LNG pump, 9 is a second heat exchanger, 10 is a fifth heat exchanger, 11 is a fourth heat exchanger, 12 is a solution pump, 13 is a separator, 14 is a second compressor, 15 is a third generator, 16 is a gas turbine, 17 is a clutch, 18 is an evaporator, 19 is a condenser, 20 is a fourth generator, 21 is a hot water tank, 22 is an expansion valve, 23 is a first compressor, 24 is a three-way valve, 25 is a first stop valve, 26 is a second stop valve, 27 is a third stop valve, 28 is a fourth stop valve, 29 is a fifth stop valve, 30 is a sixth stop valve, 31 is a seventh stop valve, 32 is an eighth stop valve, 33 is a ninth stop valve, 34 is a tenth stop valve, 35 is a condenser-side water replenishing port, 36 is a water outlet, 37 is a carbon dioxide outlet, 38 is a condenser side water outlet, 39 is an evaporator side water replenishing port, 40 is an evaporator side water outlet, 41 is a third heat exchanger, and 42 is a fan coil.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below.
As shown in fig. 1, a zero-carbon-emission combined cooling, heating and power device based on total heat cycle according to an embodiment of the present invention includes four parts, namely a brayton cycle system, a waste heat recovery system, a carbon capture system, and a heat pump system, wherein the brayton cycle system includes: an LNG pump 8, a first heat exchanger 6, a compressor 7, a reheater 3, a first turbo expander 1, a first generator 2, a second turbo expander 5, a second generator 4, a three-way valve 24 and a second heat exchanger 9, the LNG pump 8 is connected with the lower right interface of the first heat exchanger 6, the upper right interface of the first heat exchanger 6 is connected with the lower interface of the three-way valve 24, the upper port of the three-way valve 24 is connected with the second turbo expander 5, the second turbo expander 5 is connected with the upper left port of the second heat exchanger 9, the lower left interface of the first heat exchanger 6 is connected with the compressor 7, the compressor 7 is connected with the lower interface of the reheater 3, the reheater 3 is connected with the first turboexpander 1 through an interface, the first turboexpander 1 is connected with the first generator 2 through a shaft, and the second turboexpander 5 is connected with the second generator 4 through a shaft; the waste heat recovery system comprises: the flue gas channel of the gas turbine 16 is connected with the fourth generator 20, the fourth generator 20 is connected with the third heat exchanger 41, the left interface of the third heat exchanger 41 is connected with the hot water tank 21, the left interface of the ninth cut-off valve 33 is connected with the third heat exchanger 41, the right interface of the ninth cut-off valve 33 is connected with the lower interface of the seventh cut-off valve 31, the left interface of the tenth cut-off valve 34 is connected with the third heat exchanger 41, and the right interface of the tenth cut-off valve 34 is connected with the lower interface of the eighth cut-off valve 32; the carbon capture system includes: the separator 13, the second compressor 14, the fourth heat exchanger 11 and the fifth heat exchanger 10, the right interface of the separator 13 is connected with the lower interface of the second compressor 14, the upper interface of the second compressor 14 is connected with the right interface of the fourth heat exchanger 11, and the left interface of the fourth heat exchanger 11 is connected with the right interface of the fifth heat exchanger 10; the heat pump system includes: the system comprises a clutch 17, a third generator 15, a first compressor 23, a condenser 19, a throttle valve 22, an evaporator 18, a solution pump 12, a fan coil 42, a first stop valve 25, a second stop valve 26, a third stop valve 27, a fourth stop valve 28, a fifth stop valve 29, a sixth stop valve 30, a seventh stop valve 31 and an eighth stop valve 32, wherein the clutch 17 is connected with the third generator 15 through a shaft, the clutch 17 is connected with the first compressor 2 through a shaft, the right interface of the first compressor 23 is connected with the lower interface of the condenser 19, the upper interface of the condenser 19 is connected with the right interface of the throttle valve 22, the left interface of the throttle valve 22 is connected with the upper interface of the evaporator 18, the upper left interface of the evaporator 18 is connected with the lower interface of the eighth stop valve 32, the upper interface of the eighth stop valve 32 is connected with the fan coil 42, the left lower interface of the evaporator 18 is connected with the lower interface of the seventh stop valve 31, the upper port of a seventh stop valve 31 is connected with the right port of the solution pump 12, the left port of the solution pump 12 is connected with the fan coil 42, the upper right port of the condenser 19 is connected with the right port of the sixth stop valve 30, the left port of the sixth stop valve 30 is connected with the right port of the fourth stop valve 28, the left port of the fourth stop valve 28 is connected with the right port of the solution pump 12, the lower right port of the condenser 19 is connected with the right port of the fifth stop valve 29, the left port of the fifth stop valve 29 is connected with the right port of the third stop valve 27, and the left port of the third stop valve 27 is connected with the fan coil 42; the heat pump system is driven by the gas turbine to realize cooling and heating.
Wherein the circulating working medium of the Brayton cycle system is nitrogen; the throttle valve 22 is an electronic expansion valve; the fourth generator 20 is a screw expander; the evaporator side water replenishing port and the water outlet are arranged; a condenser side water replenishing port and a water outlet are arranged; the circulating working medium in the heat pump system is ethylene glycol aqueous solution; a carbon dioxide outlet 37 is arranged; the connection adopts pipeline connection.
The working method of the zero-carbon-emission combined cooling, heating and power device based on the total heat cycle is divided into the following four working modes according to the difference of the sizes of the cooling load and the heating load:
(1) the small load cold supply mode t is more than or equal to 25 DEG C
When the required room temperature is more than or equal to 25 ℃, LNG cold energy is adopted for cooling; the ninth control valve 33 and the tenth control valve 34 are in a closed state; LNG is conveyed to the first heat exchanger 6 through the LNG pump 8, exchanges heat and is heated, then enters the second turbo expander 5 to do work for the second generator 4 to generate power, and the LNG flows out, exchanges heat and is heated through the second heat exchanger 9, and then is conveyed to the gas turbine to be combusted. The nitrogen is cooled by the first heat exchanger 6, enters the compressor 7 for pressurization, enters the reheater 3 for preheating, enters the first turbo expander 1 for doing work to drive the first generator 2 to generate power, enters the first heat exchanger 6 again for heat exchange after expansion, and circulates in the way; the clutch 17 is adjusted to be connected with the third generator 15, and the combustion gas turbine 16 combusts and drives the third generator 15 to generate electricity; the high-temperature flue gas generated by the gas turbine 16 drives the fourth generator 20 to generate power, then enters the third heat exchanger 41 together with cylinder liner water to prepare hot water, the low-temperature flue gas after heat exchange enters the separator 13 to separate water and carbon dioxide, the water enters the fourth heat exchanger 11 through the left outlet of the separator 13 to absorb heat and then is discharged, the carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor 14 and then enters the fourth heat exchanger 11 to be cooled, and the cooled carbon dioxide flows through the fifth heat exchanger 10 to be liquefied by the cold energy of LNG and is discharged from the outlet 37, so that the carbon capture with low cost is realized; the first control valve 25, the second control valve 26, the third control valve 27 and the fourth control valve 28 are opened, the fifth control valve 29, the sixth control valve 30, the seventh control valve 31 and the eighth control valve 32 are closed, at this time, the glycol aqueous solution is cooled by the second heat exchanger 9 and then is conveyed to the fan coil 42 by the solution pump 12, so that the effect of cooling the room is realized, and the glycol aqueous solution after heat exchange returns to the second heat exchanger 9 to be cooled again, so that the circulation is performed;
(2) the large load cooling mode t is less than 25 DEG C
When the desired room temperature is less than 25 ℃, the ninth control valve 33 and the tenth control valve 34 are in a closed state; the LNG is conveyed to the first heat exchanger 6 through the LNG pump 8, enters the second turbo expander 5 to do work after heat exchange and temperature rise so as to supply the second generator 4 to generate power, and is conveyed to the gas turbine for combustion after flowing out and subjected to heat exchange and temperature rise through the second heat exchanger 9; the nitrogen is cooled by the first heat exchanger 6, enters the compressor 7 for pressurization, enters the reheater 3 for preheating, enters the first turbo expander 1 for doing work to drive the first generator 2 to generate power, enters the first heat exchanger 6 again for heat exchange after expansion, and circulates in the way; the clutch 17 is adjusted to be connected with the first compressor 23, and the combustion of the gas turbine 16 drives the first compressor 23 to work; the high-temperature flue gas generated by the gas turbine 16 drives the fourth generator 20 to generate power, then enters the third heat exchanger 41 together with cylinder liner water to prepare hot water, the low-temperature flue gas after heat exchange enters the separator 13 to separate water and carbon dioxide, the water enters the fourth heat exchanger 11 through the left outlet of the separator 13 to absorb heat and then is discharged, the carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor 14 and then enters the fourth heat exchanger 11 to be cooled, and the cooled carbon dioxide flows through the fifth heat exchanger 10 to be liquefied by the cold energy of LNG and is discharged from the outlet 37, so that the carbon capture with low cost is realized; the first control valve 25, the second control valve 26, the fifth control valve 29, the sixth control valve 30, the seventh control valve 31 and the eighth control valve 32 are opened, the third control valve 27 and the fourth control valve 28 are closed, at this time, the first compressor 23 drives the condenser 19 to work, the glycol aqueous solution cooled by the second heat exchanger 9 enters the condenser 19 to reduce the condensation temperature so as to improve the efficiency of the heat pump system, a water replenishing port 35 and a water outlet 38 are arranged on the side of the condenser 19, the glycol aqueous solution is changed into low-temperature high-pressure liquid by the condenser 19, enters the throttle valve 22 to be reduced in pressure, enters the evaporator 18 to evaporate and absorb heat, and then is conveyed to the coil fan 42 to realize the room cooling effect; when the load of a room is large, an open type circulating system is adopted, so that the overall efficiency of the system is improved;
(3) the small load heat supply mode t is less than or equal to 25 DEG C
When the required room temperature is less than or equal to 25 ℃, heat is supplied by waste heat of an internal combustion engine, LNG is conveyed to the first heat exchanger 6 through the LNG pump 8, enters the second turbo expander 5 to do work after heat exchange and temperature rise and is supplied to the second generator 4 for power generation, and LNG flows out, is subjected to heat exchange and temperature rise through the second heat exchanger 9 and is conveyed to the gas turbine for combustion; the nitrogen is cooled by the first heat exchanger 6, enters the compressor 7 for pressurization, enters the reheater 3 for preheating, enters the first turbo expander 1 for doing work to drive the first generator 2 to generate power, enters the first heat exchanger 6 again for heat exchange after expansion, and circulates in the way; when the seventh control valve 31, the eighth control valve 32, the ninth control valve 33 and the tenth control valve 34 are in an open state, the third control valve 27 and the fourth control valve 28 are closed, the clutch 17 is adjusted to be connected with the third generator 15, and the gas turbine 16 combusts to drive the third generator 15 to generate electricity; the high-temperature flue gas generated by the gas turbine 16 drives the fourth generator 20 to generate power, and then enters the third heat exchanger 41 together with cylinder liner water to prepare hot water, and the glycol water solution in the heat pump system is heated by the third heat exchanger 41 and then is conveyed to the fan coil 42 by the solution pump 12, so that the room temperature rise effect is realized; the low-temperature flue gas after heat exchange enters the separator 13 to separate water and carbon dioxide, the water enters the fourth heat exchanger 11 through a left outlet of the separator 13 to absorb heat and then is discharged, the carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor 14 and then enters the fourth heat exchanger 11 to be cooled, the cooled carbon dioxide flows through the fifth heat exchanger 10 to be liquefied by the cold energy of LNG and is discharged from an outlet 37, and carbon capture with low cost is realized;
(4) and a large load heating mode t >25 DEG C
When the desired room temperature is greater than 25 ℃, the ninth control valve 33 and the tenth control valve 34 are in an open state; the LNG is conveyed to the first heat exchanger 6 through the LNG pump 8, enters the second turbo expander 5 to do work after heat exchange and temperature rise so as to supply the second generator 4 to generate power, and is conveyed to the gas turbine for combustion after flowing out and subjected to heat exchange and temperature rise through the second heat exchanger 9; the nitrogen is cooled by the first heat exchanger 6, enters the compressor 7 for pressurization, enters the reheater 3 for preheating, enters the first turbo expander 1 for doing work to drive the first generator 2 to generate power, enters the first heat exchanger 6 again for heat exchange after expansion, and circulates in the way; the clutch 17 is adjusted to be connected with the third generator 15, and the combustion gas turbine 16 combusts and drives the third generator 15 to generate electricity; the high-temperature flue gas generated by the gas turbine 16 drives the fourth generator 20 to generate power, then enters the third heat exchanger 41 together with cylinder liner water to prepare hot water, the low-temperature flue gas after heat exchange enters the separator 13 to separate water and carbon dioxide, the water enters the fourth heat exchanger 11 through the left outlet of the separator 13 to absorb heat and then is discharged, the carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor 14 and then enters the fourth heat exchanger 11 to be cooled, and the cooled carbon dioxide flows through the fifth heat exchanger 10 to be liquefied by the cold energy of LNG and is discharged from the outlet 37, so that the carbon capture with low cost is realized; the first control valve 25, the second control valve 26, the seventh control valve 31 and the eighth control valve 32 are closed, the first compressor 23 drives the condenser 19 to work, at this time, the ethylene glycol aqueous solution heated by the third heat exchanger 41 enters the evaporator to increase the evaporation temperature so as to improve the overall efficiency of the heat pump system, a water replenishing port 39 and a water outlet 40 are arranged on the evaporator 18 side, and finally the solution flows through the condenser 19 and is conveyed to the fan coil 42 by the solution pump 12, so that the room temperature-increasing effect is realized; when the load of the room is large, an open type circulating system is adopted, and the overall efficiency of the system is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, but rather as the invention extends to all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.
Claims (9)
1. The utility model provides a zero carbon discharges combined cooling heating and power device based on full thermal cycle which characterized in that, includes brayton cycle system, waste heat recovery system, carbon capture system and heat pump system four bibliographic categories branch, wherein the brayton cycle system includes: an LNG pump (8), a first heat exchanger (6), a gas compressor (7), a reheater (3), a first turboexpander (1), a first generator (2), a second turboexpander (5), a second generator (4), a three-way valve (24) and a second heat exchanger (9), wherein the LNG pump (8) is connected with a lower right interface of the first heat exchanger (6), an upper right interface of the first heat exchanger (6) is connected with a lower right interface of the three-way valve (24), an upper interface of the three-way valve (24) is connected with the second turboexpander (5), the second turboexpander (5) is connected with an upper left interface of the second heat exchanger (9), a lower left interface of the first heat exchanger (6) is connected with the gas compressor (7), the gas compressor (7) is connected with a lower interface of the reheater (3), an upper interface of the reheater (3) is connected with the first turboexpander (1), the first turbine expander (1) is connected with the first generator (2) through a shaft, and the second turbine expander (5) is connected with the second generator (4) through a shaft; the waste heat recovery system comprises: the gas turbine (16), a fourth generator (20), a third heat exchanger (41), a hot water tank (21), a ninth stop valve (33) and a tenth stop valve (34), wherein a flue gas channel of the gas turbine (16) is connected with the fourth generator (20), the fourth generator (20) is connected with the third heat exchanger (41), the left interface of the third heat exchanger (41) is connected with the hot water tank (21), the left interface of the ninth stop valve (33) is connected with the third heat exchanger (41), the right interface of the ninth stop valve (33) is connected with the lower interface of a seventh stop valve (31), the left interface of the tenth stop valve (34) is connected with the third heat exchanger (41), and the right interface of the tenth stop valve (34) is connected with the lower interface of an eighth stop valve (32); the carbon capture system includes: the separator (13), the second compressor (14) and the fifth heat exchanger (10), wherein the right interface of the separator (13) is connected with the lower interface of the second compressor (14), and the upper interface of the second compressor (14) is connected with the right interface of the fifth heat exchanger (10); the heat pump system includes: the system comprises a clutch (17), a third generator (15), a first compressor (23), a condenser (19), a throttle valve (22), an evaporator (18), a solution pump (12), a fan coil (42), a first stop valve (25), a second stop valve (26), a fifth stop valve (29), a sixth stop valve (30), a seventh stop valve (31) and an eighth stop valve (32), wherein the clutch (17) is connected with the third generator (15) through a shaft, the clutch (17) is connected with the first compressor (23) through a shaft, a right interface of the first compressor (23) is connected with a lower interface of the condenser (19), an upper interface of the condenser (19) is connected with a right interface of the throttle valve (22), a left interface of the throttle valve (22) is connected with an upper interface of the evaporator (18), and a left upper interface of the evaporator (18) is connected with a lower interface of the eighth stop valve (32), interface connection is gone up in eighth stop valve (32) fan coil (42), interface connection under evaporimeter (18) the left side solution pump (12) right side interface, the left side interface connection of solution pump (12) fan coil (42), the upper right interface connection of condenser (19) the right side interface of sixth stop valve (30), the left side interface connection of sixth stop valve (30) solution pump (12) right side interface, the lower right interface connection of condenser (19) the right side interface of fifth stop valve (29), the left side interface connection of fifth stop valve (29) fan coil (42).
2. The zero-carbon-emission combined cooling, heating and power generation device based on the total heat cycle as claimed in claim 1, wherein: and a circulating working medium is arranged in the Brayton circulating system, and the circulating working medium is nitrogen or helium.
3. The zero-carbon-emission combined cooling, heating and power generation device based on the total heat cycle as claimed in claim 1, wherein: the throttle valve (22) is a capillary tube or an electronic expansion valve.
4. The zero-carbon-emission combined cooling, heating and power generation device based on the total heat cycle as claimed in claim 1, wherein: the fourth generator (20) is a turbine generator or a screw expander.
5. The zero-carbon-emission combined cooling, heating and power generation device based on the total heat cycle as claimed in claim 1, wherein: and a circulating working medium is arranged in the heat pump system, and the circulating working medium is ethylene glycol aqueous solution or Freon.
6. The zero-carbon-emission combined cooling, heating and power generation device based on the total heat cycle as claimed in claim 1, wherein: the fifth heat exchanger (10) is provided with a carbon dioxide outlet (37); an evaporator side water replenishing port (39) is arranged between the third heat exchanger (41) and the tenth stop valve (34); an evaporator side water outlet (40) is arranged between the tenth stop valve (34) and the eighth stop valve (32); a condenser side water replenishing port (35) is arranged between the second heat exchanger (9) and the second stop valve (26); a condenser side water outlet (38) is arranged between the condenser (19) and the fifth stop valve (29).
7. The zero-carbon-emission combined cooling, heating and power generation device based on the total heat cycle as claimed in claim 1, wherein: a fourth heat exchanger (11) with one end communicated with the separator (13) and the other end provided with a water outlet (36) is further communicated between the second compressor (14) and the fifth heat exchanger (10), a fourth stop valve (28) is arranged between the sixth stop valve (30) and the solution pump (12), and a third stop valve (27) is arranged between the fifth stop valve (29) and the fan coil (42).
8. The zero-carbon-emission combined cooling, heating and power generation device based on the total heat cycle as claimed in claim 1, wherein: the connection adopts pipeline connection.
9. A working method of the zero-carbon-emission combined cooling, heating and power device based on the total heat cycle as claimed in any one of claims 1 to 8 is characterized in that: according to the difference of the cold and hot load, the working modes are divided into the following four working modes:
(1) the small load cold supply mode t is more than or equal to 25 DEG C
When the required room temperature is more than or equal to 25 ℃, LNG cold energy is adopted for cooling, and the ninth stop valve (33) and the tenth stop valve (34) are in a closed state; LNG is conveyed to the first heat exchanger (6) through the LNG pump (8) to exchange heat and raise temperature, then enters the second turbo expander (5) to do work and supply the second generator (4) to generate power, and after flowing out, the LNG is conveyed to the gas turbine to be combusted after being subjected to heat exchange and temperature rise through the second heat exchanger (9); the nitrogen is cooled by the first heat exchanger (6), enters the compressor (7) for pressurization, then enters the reheater (3) for preheating, enters the first turbo expander (1) for acting to drive the first generator (2) to generate power, and enters the first heat exchanger (6) again for heat exchange after expansion, and the cycle is repeated; adjusting the clutch (17) to be connected with the third generator (15), and driving the third generator (15) to generate electricity through combustion of the gas turbine (16); high-temperature flue gas generated by the gas turbine (16) drives the fourth generator (20) to generate power, then enters the third heat exchanger (41) together with cylinder liner water to prepare hot water, low-temperature flue gas after heat exchange enters the separator (13) to separate water and carbon dioxide, water enters the fourth heat exchanger (11) through a left outlet of the separator (13) to absorb heat and then is discharged, carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor (14) and then enters the fourth heat exchanger (11) to be cooled, and the cooled carbon dioxide flows through the fifth heat exchanger (10) to be liquefied by the cold energy of LNG and is discharged from an outlet (37), so that carbon capture with low cost is realized; the first stop valve (25), the second stop valve (26), the third stop valve (27) and the fourth stop valve (28) are opened, the fifth stop valve (29), the sixth stop valve (30), the seventh stop valve (31) and the eighth stop valve (32) are closed, and at the moment, the glycol aqueous solution is cooled by the second heat exchanger (9) and then is conveyed to the fan coil (42) by the solution pump (12), so that the effect of cooling a room is realized, and the glycol aqueous solution after heat exchange returns to the second heat exchanger (9) to be cooled continuously, and the process is circulated;
(2) the large load cooling mode t is less than 25 DEG C
When the required room temperature is less than 25 ℃, the ninth stop valve (33) and the tenth stop valve (34) are in a closed state; LNG is conveyed to the first heat exchanger (6) through the LNG pump (8), enters the second turbo expander (5) to do work after heat exchange and temperature rise so as to supply the second generator (4) to generate power, and is conveyed to a gas turbine to be combusted after flowing out and being subjected to heat exchange and temperature rise through the second heat exchanger (9); the nitrogen is cooled by the first heat exchanger (6), enters the compressor (7) for pressurization, then enters the reheater (3) for preheating, enters the first turbo expander (1) for acting to drive the first generator (2) to generate power, and enters the first heat exchanger (6) again for heat exchange after expansion, and the cycle is repeated; adjusting the clutch (17) to be connected with the first compressor (23), and driving the first compressor (23) to work through combustion of the gas turbine (16); high-temperature flue gas generated by the gas turbine (16) drives the fourth generator (20) to generate power, then enters the third heat exchanger (41) together with cylinder liner water to prepare hot water, low-temperature flue gas after heat exchange enters the separator (13) to separate water and carbon dioxide, water enters the fourth heat exchanger (11) through a left outlet of the separator (13) to absorb heat and then is discharged, carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor (14) and then enters the fourth heat exchanger (11) to be cooled, and the cooled carbon dioxide flows through the fifth heat exchanger (10) to be liquefied by the cold energy of LNG and is discharged from an outlet (37), so that carbon capture with low cost is realized; the first stop valve (25), the second stop valve (26), the fifth stop valve (29), the sixth stop valve (30), the seventh stop valve (31), and the eighth stop valve (32) are opened, the third stop valve (27) and the fourth stop valve (28) are closed, at the moment, the first compressor (23) drives the condenser (19) to work, the glycol water solution cooled by the second heat exchanger (9) enters the condenser (19) to reduce the condensation temperature so as to improve the efficiency of the heat pump system, a water replenishing port (35) and a water outlet (38) are arranged on the side of the condenser (19), the glycol water solution is changed into low-temperature high-pressure liquid through the condenser (19), the low-temperature high-pressure liquid enters the throttle valve (22) to be depressurized and then enters the evaporator (18) to be evaporated and absorb heat, and then the low-temperature high-pressure liquid is conveyed to the fan coil (42) to realize the room cooling effect; when the load of a room is large, an open type circulating system is adopted, so that the overall efficiency of the system is improved;
(3) the small load heat supply mode t is less than or equal to 25 DEG C
When the required room temperature is less than or equal to 25 ℃, the heat is supplied by using the waste heat of the internal combustion engine, the LNG is conveyed to the first heat exchanger (6) through the LNG pump (8), enters the second turbo expander (5) to do work after heat exchange and temperature rise for the second generator (4) to generate electricity, and the LNG flows out, is subjected to heat exchange and temperature rise through the second heat exchanger (9), and is conveyed to the gas turbine for combustion; the nitrogen is cooled by the first heat exchanger (6), enters the compressor (7) for pressurization, then enters the reheater (3) for preheating, enters the first turbo expander (1) for acting to drive the first generator (2) to generate power, and enters the first heat exchanger (6) again for heat exchange after expansion, and the cycle is repeated; when the seventh stop valve (31), the eighth stop valve (32), the ninth stop valve (33) and the tenth stop valve (34) are in an open state, the third stop valve (27) and the fourth stop valve (28) are closed, the clutch (17) is adjusted to be connected with the third generator (15), and the gas turbine (16) combusts to drive the third generator (15) to generate electricity; high-temperature flue gas generated by the gas turbine (16) drives the fourth generator (20) to generate electricity, then the electricity and cylinder liner water enter the third heat exchanger (41) together to prepare hot water, and glycol water solution in the heat pump system is heated by the third heat exchanger (41) and then is conveyed to the fan coil (42) by the solution pump (12), so that the room temperature rise effect is realized; the low-temperature flue gas after heat exchange enters the separator (13) to separate water and carbon dioxide, the water enters the fourth heat exchanger (11) through a left outlet of the separator (13) to absorb heat and then is discharged, the carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor (14) and then enters the fourth heat exchanger (11) to be cooled, the cooled carbon dioxide flows through the fifth heat exchanger (10) to be liquefied by the cold energy of LNG and is discharged from an outlet (37), and carbon capture with low cost is realized;
(4) and a large load heating mode t >25 DEG C
When the required room temperature is more than 25 ℃, the ninth stop valve (33) and the tenth stop valve (34) are in an open state; LNG is conveyed to the first heat exchanger (6) through the LNG pump (8), enters the second turbo expander (5) to do work after heat exchange and temperature rise so as to supply the second generator (4) to generate power, and is conveyed to a gas turbine to be combusted after flowing out and being subjected to heat exchange and temperature rise through the second heat exchanger (9); the nitrogen is cooled by the first heat exchanger (6), enters the compressor (7) for pressurization, then enters the reheater (3) for preheating, enters the first turbo expander (1) for acting to drive the first generator (2) to generate power, and enters the first heat exchanger (6) again for heat exchange after expansion, and the cycle is repeated; adjusting the clutch (17) to be connected with the third generator (15), and driving the third generator (15) to generate electricity through combustion of the gas turbine (16); high-temperature flue gas generated by the gas turbine (16) drives the fourth generator (20) to generate power, then enters the third heat exchanger (41) together with cylinder liner water to prepare hot water, low-temperature flue gas after heat exchange enters the separator (13) to separate water and carbon dioxide, water enters the fourth heat exchanger (11) through a left outlet of the separator (13) to absorb heat and then is discharged, carbon dioxide is compressed into high-pressure carbon dioxide by the second compressor (14) and then enters the fourth heat exchanger (11) to be cooled, and the cooled carbon dioxide flows through the fifth heat exchanger (10) to be liquefied by the cold energy of LNG and is discharged from an outlet (37), so that carbon capture with low cost is realized; the first, second, seventh and eighth cut-off valves (25, 26, 31, 32) are closed; the first compressor (23) drives the condenser (19) to work, at the moment, the ethylene glycol aqueous solution heated by the third heat exchanger (41) enters the evaporator to increase the evaporation temperature so as to improve the overall efficiency of the heat pump system, a water replenishing port (39) and a water outlet (40) are arranged on the side of the evaporator (18), and finally the solution flows through the condenser (19) and is conveyed to the fan coil (42) by the solution pump (12), so that the room heating effect is realized; when the load of the room is large, an open type circulating system is adopted, and the overall efficiency of the system is improved.
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| CN113251232B (en) * | 2021-06-29 | 2021-11-12 | 中国石油天然气股份有限公司西南油气田分公司勘探开发研究院 | Gas storage wellhead throttling device |
| CN113638806B (en) * | 2021-08-19 | 2022-04-26 | 江苏科技大学 | System for LNG cold energy gradient recovery of alternating load and peak shaving method |
| CN115075988B (en) * | 2022-06-28 | 2023-09-15 | 江苏科技大学 | Large-scale low-power-consumption LNG power ship tail gas carbon capture system and operation method |
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| US20120036888A1 (en) * | 2007-11-05 | 2012-02-16 | David Vandor | Method and system for the small-scale production of liquified natural gas (lng) and cold compressed gas (ccng) from low-pressure natural gas |
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| CN102322301B (en) * | 2011-06-01 | 2014-06-25 | 华北电力大学 | Coal-fired electricity generation-CO2 capture-heat supply integrating system and method |
| US20140238236A1 (en) * | 2013-02-25 | 2014-08-28 | Mitsubishi Heavy Industries, Ltd. | Cogeneration system concept for co2 recovery plant |
| CN206158809U (en) * | 2016-09-19 | 2017-05-10 | 青岛科技大学 | System is used multipurposely to LNG power boat's cold energy |
| CN108331625B (en) * | 2017-12-29 | 2019-10-25 | 华中科技大学 | A kind of electricity generation system using the Natural Gas Power Plant smoke evacuation latent heat of vaporization |
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2019
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