CN117489434A - Air separation coupling alam circulation power generation system utilizing LNG cold energy - Google Patents
Air separation coupling alam circulation power generation system utilizing LNG cold energy Download PDFInfo
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- CN117489434A CN117489434A CN202311430763.5A CN202311430763A CN117489434A CN 117489434 A CN117489434 A CN 117489434A CN 202311430763 A CN202311430763 A CN 202311430763A CN 117489434 A CN117489434 A CN 117489434A
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- 238000000926 separation method Methods 0.000 title claims abstract description 49
- 238000010248 power generation Methods 0.000 title claims abstract description 19
- 230000008878 coupling Effects 0.000 title claims abstract description 9
- 238000010168 coupling process Methods 0.000 title claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 162
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 81
- 239000007788 liquid Substances 0.000 claims abstract description 78
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 70
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 37
- 239000003345 natural gas Substances 0.000 claims abstract description 35
- 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
- 239000007789 gas Substances 0.000 claims abstract description 23
- 239000003507 refrigerant Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 239000003949 liquefied natural gas Substances 0.000 claims description 67
- 239000013535 sea water Substances 0.000 claims description 24
- 238000002485 combustion reaction Methods 0.000 claims description 22
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 9
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- AEDZKIACDBYJLQ-UHFFFAOYSA-N ethane-1,2-diol;hydrate Chemical compound O.OCCO AEDZKIACDBYJLQ-UHFFFAOYSA-N 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 12
- 238000005057 refrigeration Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 description 5
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
Classifications
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/04309—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
- F25J3/04315—Lowest pressure or impure nitrogen, so-called waste nitrogen expansion
-
- 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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04109—Arrangements of compressors and /or their drivers
Abstract
An air separation coupling Allam circulation power generation system utilizing LNG cold energy comprises an LNG low-temperature air separation system, an Allam circulation system and CO 2 A liquefaction system and a cooling system; through the LNG air separation system, the high-efficiency utilization of LNG cold energy and the low-temperature separation of nitrogen and oxygen are realized, and the energy consumption of refrigeration cycle is reduced; through an Allam circulating system, gasified natural gas and pure oxygen are combusted, generated high-temperature flue gas is expanded to generate power, and simultaneously, liquid oxygen of an air separated product is utilized to carry out high-efficiency CO on the dehydrated high-temperature flue gas 2 Capturing and realizing CO 2 Zero emission, and liquid oxygen is gasified and then used as feed gas for Allam circulation; by CO 2 Liquefaction system for liquefying CO captured by Allam circulation system by using a part of product liquid nitrogen separated by air 2 Will beGaseous CO 2 Liquefied into liquid CO 2 The method comprises the steps of carrying out a first treatment on the surface of the Cooling the refrigerant through a cooling system, and providing the refrigerant for a terminal user for refrigeration; has the advantages of high efficiency, energy saving, simple operation, high stability, high purity of air separation products, strong practicability and CO 2 Zero emission, high economic benefit and the like.
Description
Technical Field
The invention relates to an LNG cold energy utilization system, in particular to an air separation coupling Allam cycle power generation system utilizing LNG cold energy.
Background
About 830kJ/kg of cold energy is released in the LNG gasification process, and the part of cold energy is utilized, so that considerable economic benefits can be generated. The air separation is an effective way to utilize LNG cold energy, and the principle is that the LNG cold energy is utilized to cool air to low temperature, so that the air is converted into liquid air, and according to the difference of the boiling points of nitrogen and oxygen, the liquid air is subjected to rectification mass transfer and heat transfer in a rectifying tower, and nitrogen and oxygen in the liquid air are separated, so that high-purity nitrogen and oxygen products are obtained. The air separation system has high cost and lower economic benefit due to huge equipment quantity and high energy consumption. The energy consumption of refrigeration cycle in the air separation process can be obviously reduced by utilizing LNG cold energy, but the existing air separation process can only utilize partial cold energy of LNG, and the utilization efficiency of the LNG cold energy is further improved by combining with other processes.
The Allam cycle uses pure oxygen and natural gas, water gas (H) 2 +CO), hydrogen (H) 2 ) The gaseous fuel, e.g. hydrocarbon, being directly combusted and CO 2 The semi-closed Brayton cycle which is highly backheated by the circulating working medium has higher thermal efficiency and economic benefit, and can realize CO 2 Zero emission. However, the traditional Allam circulation has more severe requirements on raw gas, and utilizes water cooling high-temperature flue gas to capture CO 2 Resulting in lower carbon capture efficiency and CO 2 The purity is not high. In recent years, some scholars combine the alam cycle with the air separation unit, solve the problem of supplying pure oxygen in the alam cycle, but do not effectively couple the air separation system and the alam cycle system. Part of students combine the Allam circulation and the LNG gasification process, so that the system efficiency is improved, better economic benefits are realized, but the utilization of LNG cold energy is insufficient.
In summary, how to realize gradient utilization of LNG cold energy and CO through the coupling design of the air separation process and the Allam circulation 2 Is to effectively collect and reduce the energy consumption of the system and improve the economic benefit of the systemThe key problem to be solved is urgent.
Disclosure of Invention
In order to solve the defects of the prior art and technology, the invention aims to provide an air separation coupling alam cycle power generation system utilizing LNG cold energy, and the LNG cold energy is efficiently utilized and the nitrogen and oxygen are separated at low temperature through the LNG air separation system, so that the energy consumption of refrigeration cycle is reduced; through an Allam circulating system, gasified natural gas and pure oxygen are combusted, generated high-temperature flue gas is expanded to generate power, and simultaneously, liquid oxygen of an air separated product is utilized to carry out high-efficiency CO on the dehydrated high-temperature flue gas 2 Capturing and realizing CO 2 Zero emission, and liquid oxygen is gasified and then used as feed gas for Allam circulation; by CO 2 Liquefaction system for liquefying CO captured by Allam circulation system by using a part of product liquid nitrogen separated by air 2 CO in gaseous state 2 Liquefied into liquid CO 2 The method comprises the steps of carrying out a first treatment on the surface of the The cooling system is used for cooling the refrigerant, and the cooled refrigerant is used for cooling a data center, a refrigeration house and air conditioning refrigeration, so that the power consumption of refrigeration of enterprises can be reduced; the invention performs gradient utilization on LNG cold energy, and simultaneously realizes liquid nitrogen and liquid CO 2 The cold and electricity poly-generation has the advantages of high efficiency, energy conservation, simple operation, high stability, high purity of air separation products, strong practicability and CO 2 Zero emission, high economic benefit and the like.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an air separation coupling Allam circulation power generation system utilizing LNG cold energy comprises an LNG air separation system, an Allam circulation system and CO 2 A liquefaction system and a cooling system; the nitrogen and the oxygen are subjected to low-temperature separation through an LNG air separation system; through an Allam circulating system, gasified natural gas and pure oxygen are combusted, generated high-temperature flue gas is expanded to generate power, and simultaneously, liquid oxygen of an air separated product is utilized to carry out high-efficiency CO on the dehydrated high-temperature flue gas 2 Capturing and realizing CO 2 Zero emission, and liquid oxygen is gasified and then used as feed gas for Allam circulation; by CO 2 Liquefying system for separating a part of air from liquid nitrogenCO captured in a liquefaction Allam circulation System 2 CO in gaseous state 2 Liquefied into liquid CO 2 The method comprises the steps of carrying out a first treatment on the surface of the And cooling the refrigerant of the cooling system by the cooling system, and providing the cooled refrigerant for the end user to refrigerate.
The LNG air separation system comprises an LNG pump 1, LNG at the outlet of the LNG pump 1 is connected to the cold flow LNG inlet side of a first heat exchanger 2, the cold flow outlet side of the first heat exchanger 2 is connected to the cold flow LNG inlet side of a second heat exchanger 3, the cold flow outlet side of the second heat exchanger 3 is connected to the natural gas inlet of a first three-way device 4, the hot flow inlet side of the second heat exchanger 3 is an air inlet, the hot flow air outlet side of the second heat exchanger 3 is connected to the air inlet of a first compressor 5, the outlet side of the first compressor 5 is connected to the first hot flow air inlet side of the first heat exchanger 2, the first hot flow outlet side of the first heat exchanger 2 is connected to the hot flow air inlet side of a third heat exchanger 6, the hot flow outlet side of the third heat exchanger 6 is connected to the second feed inlet of a first rectifying tower 7, the top discharge port of the first rectifying tower 7 is connected to the liquid nitrogen inlet of a second three-way device 8, the bottom discharge port of the first rectifying tower 7 is connected to the oxygen-enriched liquid inlet of the first throttling valve 9, the outlet side of the second three-way valve 8 is divided into two branches, the first branch is connected to the inlet side of the second throttling valve 10, the second branch is connected to the inlet side of the third throttling valve 11, the outlet side of the first throttling valve 9 is connected to the second inlet of the second rectifying tower 12, the outlet side of the second throttling valve 10 is connected to the first inlet of the second rectifying tower 12, the outlet side of the third throttling valve 11 is connected to the cold flow inlet side of the fourth heat exchanger 13, the top discharge port of the second rectifying tower 12 is connected to the first cold flow inlet side of the third heat exchanger 6, the cold flow outlet side of the fourth heat exchanger 13 is connected to the second cold flow inlet side of the third heat exchanger 6, the first cold flow outlet side of the third heat exchanger 6 is connected to the nitrogen inlet of the second compressor 14, the second cold flow outlet side of the third heat exchanger 6 is connected to the first inlet of the mixer 15, the outlet side of the second compressor 14 is connected to the second inlet of the mixer 15, the nitrogen outlet side of the mixer 15 is connected to the third cold flow inlet side of the third heat exchanger 6, the third cold flow outlet side of the third heat exchanger 6 is connected to the fourth hot flow nitrogen inlet side of the first heat exchanger 2, the fourth hot flow outlet side of the first heat exchanger 2 is connected to the nitrogen inlet of the third compressor 16,the outlet of the third compressor 16 is connected to the third heat flow nitrogen inlet side of the first heat exchanger 2, the third heat flow outlet side of the first heat exchanger 2 is connected to the nitrogen inlet of the fourth compressor 17, the outlet of the fourth compressor 17 is connected to the second heat flow nitrogen inlet side of the first heat exchanger 2, the second heat flow outlet side of the first heat exchanger 2 is connected to the nitrogen inlet of the third tee 18, the outlet of the third tee 18 is divided into two branches, the first branch is connected to the first feeding port of the first rectifying tower 7, the second branch is connected to the heat flow inlet side of the fourth heat exchanger 13, the heat flow outlet side of the fourth heat exchanger 13 is connected to the liquid nitrogen inlet of the fourth tee 19, the outlet of the fourth tee 19 is divided into two branches, the first branch is connected to the inlet of the liquid nitrogen storage tank 20, and the second branch is connected to the CO 2 A liquefaction system.
The alam circulating system comprises a liquid oxygen pump 21, the liquid oxygen of the outlet of the liquid oxygen pump 21 is connected to the second cold flow liquid oxygen inlet side of the fifth heat exchanger 22, the second cold flow outlet side of the fifth heat exchanger 22 is connected to the pure oxygen inlet of the combustion chamber 23, the natural gas outlet of the first three-way device 4 is divided into two branches, the first branch is connected to the cold flow inlet side of the sixth heat exchanger 24, the second branch is connected to the natural gas inlet of the fifth compressor 25, the outlet side of the fifth compressor 25 is connected to the natural gas inlet of the combustion chamber 23, the top outlet side of the combustion chamber 23 is connected to the high temperature flue gas inlet of the first expansion machine 26, the outlet of the first expansion machine 26 is connected to the high temperature flue gas inlet of the first seawater cooler 27, the outlet of the first seawater cooler 27 is connected to the inlet of the first separator 28, the top outlet of the first separator 28 is connected to the flue gas inlet of the second seawater cooler 29, the outlet of the second seawater cooler 29 is connected to the inlet of the second separator 30, the top outlet of the second separator 30 is connected to the natural gas inlet of the sixth heat exchanger 24, the top outlet of the second separator 30 is connected to the natural gas inlet of the fifth heat exchanger 24, the top outlet side of the fifth separator 25 is connected to the third heat exchanger 31, the top outlet of the third heat exchanger 31 is connected to the top outlet of the fifth heat exchanger 22, and the top outlet of the third heat exchanger 31 is connected to the top outlet of the third heat exchanger 31, and the third heat exchanger is connected to the third heat separator is connected to the top outlet of the third separator 2 A liquid inlet side, a third cold flow outlet side of the fifth heat exchanger 22A feed inlet of the fourth separator 33 is connected, and a top outlet of the fourth separator 33 is connected with gaseous CO of the fifth three-way device 34 2 The inlet and the outlet of the fifth tee 34 are divided into two branches, and the second branch is connected to the gaseous CO of the sixth compressor 35 2 The outlet of the sixth compressor 35 is connected to the gaseous CO of the third seawater cooler 36 2 The inlet side, the outlet of the third seawater cooler 36 is connected to liquid CO 2 Liquid CO of pump 37 2 Inlet, liquid CO 2 The outlet of the pump 37 is connected to the liquid CO of the combustion chamber 23 2 An inlet.
Said CO 2 The liquefying system comprises a fourth three-way device 19, a first outlet of the fourth three-way device 19 is connected to the inlet of the liquid nitrogen storage tank 20, a second outlet is connected to the cold flow liquid nitrogen inlet side of the seventh heat exchanger 38, the hot flow inlet side of the seventh heat exchanger 38 and the gaseous CO of the sixth compressor 39 2 The outlet is communicated, the working medium inlet side of the sixth compressor 39 is communicated with the first outlet of the fifth three-way valve 34, and the hot flow gaseous CO of the seventh heat exchanger 38 2 The outlet side is connected with liquid CO 2 An inlet of the reservoir 40.
The cooling system comprises a seventh heat exchanger 38, wherein a cold flow outlet side of the seventh heat exchanger 38 is connected to a cold flow inlet side of an eighth heat exchanger 41, and a hot flow inlet side and a hot flow outlet side of the eighth heat exchanger 41 are refrigerants.
The cold flow outlet of the sixth heat exchanger 24 is natural gas which is conveyed to a pipe network; the working medium at the top outlet side of the third separator 31 is purified gas; the working medium at the top outlet side of the fourth separator 33 is high-concentration CO2 gas.
The working medium at the working medium inlet side of the LNG pump 1 is liquefied natural gas; the outlet working medium of the first tee 4 is natural gas; the working medium of the top discharge port of the first rectifying tower 7 is high-concentration nitrogen; the working medium of the top discharge port of the second rectifying tower 12 is high-concentration nitrogen, and the working medium of the bottom discharge port is high-concentration liquid oxygen; the working medium at the top outlet side of the combustion chamber 23 is high-temperature flue gas; the cold flow outlet of the sixth heat exchanger 24 is natural gas which is conveyed to a pipe network; the working medium at the top outlet side of the third separator 31 is purified gas; the working medium at the top outlet side of the fourth separator 33 is high-concentration CO2 gas.
The hot flow outlet of the eighth heat exchanger 41 is connected to the cooling system of the user.
The refrigerant of the cooling system comprises but is not limited to ethylene glycol, 60% ethylene glycol water solution, propylene glycol solution, 20% calcium chloride solution, R410a and R170.
The invention has the beneficial effects that:
the method comprises the steps of combining a low-temperature air separation process, an Allam power generation cycle and LNG cold energy utilization, firstly, performing low-temperature separation on air through the air separation process to obtain high-concentration liquid nitrogen and liquid oxygen, performing LNG gasification, taking gasified small part of natural gas as fuel of the Allam cycle, and performing CO 2 The high-concentration liquid obtained by air separation is oxidized into high-concentration oxygen in the capturing process to serve as a source of pure oxygen in the Allam circulation, so that self-sufficiency of the Allam circulation feed gas is realized; secondly, through the Allam cycle power generation process, the burnt high-temperature flue gas is expanded to generate power, and CO is used for generating power 2 The high-concentration liquid oxygen obtained by air separation is used as a low-temperature cold source in the capture process for capturing CO 2 By CO 2 The small liquid nitrogen product obtained by air separation is used as a cold source for liquefying CO in the liquefaction process and the refrigerant cooling process 2 And cooling refrigerant, which has the effect of indirectly utilizing LNG cold energy and simultaneously CO 2 High efficiency capture of CO 2 Zero emission; then, the LNG cold energy is subjected to cascade utilization through the air separation coupling Allam circulating power generation system, and liquid nitrogen and liquid CO are simultaneously realized 2 The cold and electricity poly-generation has the effects of fully and efficiently utilizing cold energy and high economic benefit.
In conclusion, the invention has the advantages of high efficiency, energy saving, simple operation, high stability, high purity of the space division product, strong practicability and CO 2 Zero emission, high economic benefit and the like.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. an LNG pump; 2. a first heat exchanger; 3. a second heat exchanger; 4. a first tee; 5. a first compressor; 6. a third heat exchanger; 7. a first rectifying column; 8. a second tee; 9. first oneA throttle valve; 10. a second throttle valve; 11. a third throttle valve; 12. a second rectifying column; 13. a fourth heat exchanger; 14. a second compressor; 15. a mixer; 16. a third compressor; 17. a fourth compressor; 18. a third tee; 19. a fourth tee; 20. a liquid nitrogen storage tank; 21. a liquid oxygen pump; 22. a fifth heat exchanger; 23. a combustion chamber; 24. a sixth heat exchanger; 25. a fifth compressor; 26. a first expander; 27. a first seawater cooler; 28. a first separator; 29. a second seawater cooler; 30. a second separator; 31. a third separator; 32. a second expander; 33. a fourth separator; 34. a fifth tee; 35. a sixth compressor; 36. a third seawater cooler; 37. liquid CO 2 A pump; 38. a seventh heat exchanger; 39. a sixth compressor; 40. liquid CO 2 A storage tank; 41. and an eighth heat exchanger.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, an air separation coupled alam cycle power generation system using LNG cold energy includes an LNG air separation system, an alam cycle system, and CO 2 A liquefaction system and a cooling system; the low-temperature separation of nitrogen and oxygen is carried out by an LNG air separation system; through an Allam circulating system, gasified natural gas and pure oxygen are combusted, generated high-temperature flue gas is expanded to generate power, and simultaneously, liquid oxygen of an air separated product is utilized to carry out high-efficiency CO on the dehydrated high-temperature flue gas 2 Capturing and realizing CO 2 Zero emission, and liquid oxygen is gasified and then used as feed gas for Allam circulation; by CO 2 Liquefaction system for liquefying CO captured by Allam circulation system by using a part of product liquid nitrogen separated by air 2 CO in gaseous state 2 Liquefied into liquid CO 2 The method comprises the steps of carrying out a first treatment on the surface of the And cooling the refrigerant of the cooling system by the cooling system, and providing the cooled refrigerant for the end user to refrigerate.
The LNG air separation system comprises an LNG pump 1, LNG at the outlet of the LNG pump 1 is connected to the cold flow (LNG) inlet side of a first heat exchanger 2, the cold flow outlet side of the first heat exchanger 2 is connected to the cold flow (LNG) inlet side of a second heat exchanger 3, and the cold flow outlet side of the second heat exchanger 3 is connected to the cold flow (LNG) inlet side of a second heat exchanger 2The natural gas inlet of the first three-way device 4 is entered, the heat flow inlet side of the second heat exchanger 3 is an air inlet, the heat flow (air) outlet side of the second heat exchanger 3 is accessed to the air inlet of the first compressor 5, the outlet side of the first compressor 5 is accessed to the first heat flow (air) inlet side of the first heat exchanger 2, the first heat flow outlet side of the first heat exchanger 2 is accessed to the heat flow (air) inlet side of the third heat exchanger 6, the heat flow outlet side of the third heat exchanger 6 is accessed to the second feed inlet of the first rectifying tower 7, the top discharge port of the first rectifying tower 7 is accessed to the liquid nitrogen inlet of the second three-way device 8, the bottom discharge port of the first rectifying tower 7 is accessed to the oxygen-enriched liquid inlet of the first throttle valve 9, the outlet side of the second three-way device 8 is divided into two branches, the first branch is accessed to the inlet side of the second throttle valve 10, the second branch is accessed to the inlet side of the third throttle valve 11, the outlet side of the first throttle valve 9 is connected to the second inlet of the second rectifying tower 12, the outlet side of the second throttle valve 10 is connected to the first inlet of the second rectifying tower 12, the outlet side of the third throttle valve 11 is connected to the cold flow inlet side of the fourth heat exchanger 13, the top discharge port of the second rectifying tower 12 is connected to the first cold flow inlet side of the third heat exchanger 6, the cold flow outlet side of the fourth heat exchanger 13 is connected to the second cold flow inlet side of the third heat exchanger 6, the first cold flow outlet side of the third heat exchanger 6 is connected to the nitrogen inlet of the second compressor 14, the second cold flow outlet side of the third heat exchanger 6 is connected to the first inlet of the mixer 15, the outlet side of the second compressor 14 is connected to the second inlet of the mixer 15, the nitrogen outlet side of the mixer 15 is connected to the third cold flow inlet side of the third heat exchanger 6, the third cold flow outlet side of the third heat exchanger 6 is connected to the fourth hot flow (nitrogen) inlet side of the first heat exchanger 2, the fourth hot flow outlet side of the first heat exchanger 2 is connected to the nitrogen inlet of the third compressor 16, the outlet of the third compressor 16 is connected to the third hot flow (nitrogen) inlet side of the first heat exchanger 2, the third hot flow outlet side of the first heat exchanger 2 is connected to the nitrogen inlet of the fourth compressor 17, the outlet of the fourth compressor 17 is connected to the second hot flow (nitrogen) inlet side of the first heat exchanger 2, the second hot flow outlet side of the first heat exchanger 2 is connected to the nitrogen inlet of the third tee 18, the outlet of the third tee 18 is divided into two branches, the first branch is connected to the first feeding port of the first rectifying tower 7, and the second branch is connected to the hot flow inlet side of the fourth heat exchanger 13The heat flow outlet side of the fourth heat exchanger 13 is connected with the liquid nitrogen inlet of the fourth three-way device 19, the outlet of the fourth three-way device 19 is divided into two branches, the first branch is connected with the inlet of the liquid nitrogen storage tank 20, and the second branch is connected with CO 2 A liquefaction system.
The alam circulating system comprises a liquid oxygen pump 21, the liquid oxygen at the outlet of the liquid oxygen pump 21 is connected to the second cold flow (liquid oxygen) inlet side of the fifth heat exchanger 22, the second cold flow outlet side of the fifth heat exchanger 22 is connected to the pure oxygen inlet of the combustion chamber 23, the natural gas outlet of the first three-way device 4 is divided into two branches, the first branch is connected to the cold flow inlet side of the sixth heat exchanger 24, the second branch is connected to the natural gas inlet of the fifth compressor 25, the outlet side of the fifth compressor 25 is connected to the natural gas inlet of the combustion chamber 23, the top outlet side of the combustion chamber 23 is connected to the high-temperature flue gas inlet of the first expansion machine 26, the outlet of the first expansion machine 26 is connected to the high-temperature flue gas inlet of the first seawater cooler 27, the outlet of the first seawater cooler 27 is connected to the inlet of the first separator 28, the top discharge port of the first separator 28 is connected to the flue gas inlet of the second seawater cooler 29, the outlet of the second separator 30 is connected to the inlet of the third separator 30, the top discharge port of the second separator 30 is connected to the natural gas inlet of the sixth heat exchanger 24, the top discharge port of the second separator 30 is connected to the third heat exchanger 24, the top discharge port of the second separator 22 is connected to the hot flow inlet of the third heat exchanger 31 is connected to the third heat exchanger 31, the top heat exchanger 31 is connected to the top heat exchanger of the third heat exchanger 22, and the top heat exchanger 31 is connected to the top heat exchanger 31 of the third heat exchanger is connected to the top heat exchanger 31 2 Liquid) inlet side, the third cold flow outlet side of the fifth heat exchanger 22 is connected to the feed inlet of the fourth separator 33, and the top outlet of the fourth separator 33 is connected to the gaseous CO of the fifth three-way valve 34 2 The inlet and the outlet of the fifth tee 34 are divided into two branches, and the second branch is connected to the gaseous CO of the sixth compressor 35 2 The outlet of the sixth compressor 35 is connected to the gaseous CO of the third seawater cooler 36 2 The inlet side, the outlet of the third seawater cooler 36 is connected to liquid CO 2 Liquid CO of pump 37 2 Inlet, liquid CO 2 The outlet of the pump 37 is connected to a combustion engineLiquid CO of the firing chamber 23 2 An inlet.
Said CO 2 The liquefaction system comprises a fourth three-way device 19, a first outlet of the fourth three-way device 19 is connected to an inlet of the liquid nitrogen storage tank 20, a second outlet is connected to a cold flow (liquid nitrogen) inlet side of the seventh heat exchanger 38, a hot flow inlet side of the seventh heat exchanger 38 and gaseous CO of the sixth compressor 39 2 The outlet is communicated, the working medium inlet side of the sixth compressor 39 is communicated with the first outlet of the fifth three-way valve 34, and the heat flow (gaseous CO 2 ) The outlet side is connected with liquid CO 2 An inlet of the reservoir 40.
The cooling system comprises a seventh heat exchanger 38, wherein a cold flow outlet side of the seventh heat exchanger 38 is connected to a cold flow inlet side of an eighth heat exchanger 41, and a hot flow inlet side and a hot flow outlet side of the eighth heat exchanger 41 are refrigerants.
The working medium at the working medium inlet side of the LNG pump 1 is liquefied natural gas; the working medium at the hot flow inlet side of the second heat exchanger 3 is air; the outlet working medium of the first tee 4 is natural gas; the working medium of the top discharge port of the first rectifying tower 7 is high-concentration nitrogen; the working medium of the top discharge port of the second rectifying tower 12 is high-concentration nitrogen, and the working medium of the bottom discharge port is high-concentration liquid oxygen; the working medium at the top outlet side of the combustion chamber 23 is high-temperature flue gas; the cold flow outlet of the sixth heat exchanger 24 is natural gas which is conveyed to a pipe network; the working medium at the top outlet side of the third separator 31 is purified gas; the working medium at the top outlet side of the fourth separator 33 is high-concentration CO 2 A gas; liquid CO 2 The inlet working medium of the pump 37 is liquid CO 2 。
The hot-flow outlet side of the eighth heat exchanger 41 is connected to the cooling system of the end user.
The refrigerant of the cooling system comprises but is not limited to ethylene glycol, 60% ethylene glycol water solution, propylene glycol solution, 20% calcium chloride solution, R410a and R170.
The working principle of the invention is as follows:
the LNG is pressurized and conveyed to the first heat exchanger 2 as cold flow through the LNG pump 1, then enters the second heat exchanger 3 to precool the air, and the air pressurized by the first compressor 5 and precooled by the second heat exchanger 3 entersCooling the liquid in the first heat exchanger 2 again by LNG, cooling the product separated by low-temperature air in the third heat exchanger 6 to reach the temperature for air separation, cooling the air for three times, entering the second feed port of the first rectifying tower 7, transferring heat, discharging high-purity liquid nitrogen from the top discharge port of the first rectifying tower 7, discharging low-purity liquid oxygen from the bottom discharge port, introducing oxygen-enriched liquid into the first throttle valve 9 for throttling to meet the pressure requirement of the second rectifying tower 12, dividing the high-purity liquid nitrogen from the top discharge port into two branches after entering the inlet of the second three-way valve 8, throttling the larger branch into the second throttle valve 10 for reaching the pressure requirement of the second rectifying tower 12, throttling the smaller branch into the third throttle valve 11, introducing the high-purity liquid nitrogen throttled by the second throttle valve 10 into the first feed port of the second rectifying tower 12, the oxygen-enriched liquid throttled by the first throttle valve 9 is connected into a second feeding port of the second rectifying tower 12, after the high-purity liquid nitrogen and the oxygen-enriched liquid are rectified in the second rectifying tower 12, the high-purity nitrogen is discharged from a discharging port at the top of the second rectifying tower 12, the nitrogen is then connected into a cold flow inlet at the second inlet of the third heat exchanger 6 to provide cold energy for air cooling, the high-purity liquid oxygen is discharged from a discharging port at the bottom, the low-pressure low-temperature liquid nitrogen throttled by the third throttle valve 11 is connected into a cold flow inlet of the fourth heat exchanger 13 to provide cold energy, the nitrogen at the cold flow outlet of the fourth heat exchanger 13 is also connected into a cold flow inlet at the third inlet of the third heat exchanger 6 to provide cold energy for air cooling, the nitrogen at the cold flow outlet at the third outlet of the third heat exchanger 6 is connected into an inlet of the second compressor 14 to pressurize, the nitrogen at the third outlet cold flow outlet of the third heat exchanger 6 and the nitrogen pressurized by the second compressor 14 enter the mixer 15, the mixed nitrogen enters the fourth inlet cold flow inlet of the third heat exchanger 6 again, the fifth inlet of the first heat exchanger 2 is cooled by LNG after providing cold energy for air cooling, the inlet of the cooled nitrogen enters the third compressor 16 to be pressurized, the pressurized nitrogen enters the first heat exchanger 2 again to be cooled due to temperature rise, after the process of being pressurized and cooled once again, the nitrogen at the third outlet hot flow outlet of the first heat exchanger 2 reaches the temperature and pressure requirements of the first rectifying tower 7, and then the third three-way valve is connected18 are divided into two strands after entering, the larger strand flows back to the first feeding port of the first rectifying tower 7, nitrogen circulation is completed by rectification, the smaller strand is connected to the hot flow inlet of the fourth heat exchanger 13, high-purity liquid nitrogen is obtained after supercooling, the high-purity liquid nitrogen at the hot flow outlet of the fourth heat exchanger 13 is divided into two strands after being connected to the inlet of the fourth tee, and the larger strand is connected to the liquid nitrogen storage tank 20, so that the LNG low-temperature air separation process is completed; the high-purity liquid oxygen at the bottom discharge port of the rectifying tower 20 is pressurized by a liquid oxygen pump 21 and then is connected to the cold flow inlet end of the second inlet of the fifth heat exchanger 22, so as to capture CO 2 Providing cold energy, and capturing CO by liquid oxygen 2 Oxygen which becomes high purity after cold energy is provided is taken as a first inlet of the Allam circulating raw material gas to be connected into the combustion chamber 23, a cold flow outlet end of the second heat exchanger 3 is natural gas after precooling air, the inlet of the natural gas connected into the first tee 4 is divided into two parts, and a larger part is connected into a cold flow inlet end of the sixth heat exchanger 24 to capture CO 2 Precooling and simultaneously transferring natural gas at normal temperature, wherein a smaller stream of natural gas is firstly connected into a fifth compressor 25 for pressurization, the pressurized natural gas is connected into a second inlet of a combustion chamber 23 for combustion as fuel of Allam circulation, and an outlet of the combustion chamber 23 contains a large amount of CO 2 And the high-temperature flue gas of the water vapor is connected into the inlet of the first expander 26 to expand and externally apply work to generate power, the expanded high-temperature flue gas is connected into the inlet of the first seawater cooler 27 to be cooled by seawater, then is connected into the inlet of the first separator 28 to be subjected to first-stage dehydration, the top outlet of the first separator 28 is the flue gas subjected to first-stage dehydration, the flue gas is connected into the inlet of the second seawater cooler 29 to be cooled again, then is connected into the inlet of the second separator 30 to be subjected to second-stage dehydration, then the flue gas subjected to second-stage dehydration is connected into the hot flow inlet end of the sixth heat exchanger 24 to be precooled by natural gas, the precooled flue gas is connected into the third inlet hot flow inlet end of the fifth heat exchanger 22, the flue gas subjected to the third outlet hot flow outlet end of the cooled fifth heat exchanger 22 is a gas-liquid mixture, then is connected into the inlet of the third separator 31, the top outlet of the third separator 31 is discharged from the top outlet of the second-stage dehydrated purified gas, and the bottom outlet is discharged from the bottom outlet is rich in CO 2 Liquid, purificationThe gas is firstly connected into the second expander 32 to expand to do work to generate power, and then is connected into the cold flow inlet side of the first inlet of the fifth heat exchanger 22 to capture CO 2 Providing a part of cold energy and discharging the cold energy into the atmosphere, and enriching CO 2 The liquid is supplied to the cold flow inlet end of the fourth inlet of the fifth heat exchanger 22 to provide cold energy, and then is supplied to the inlet of the fourth separator 33 to separate the residual moisture, and the top outlet of the fourth separator 33 is high-purity CO 2 The gas is split into two after being connected to the inlet of the fifth three-way valve 34, and the larger gas is connected to the inlet of the sixth compressor 35 to be pressurized to a certain pressure, and then is connected to the seawater cooler to be cooled into liquid CO 2 Liquid CO 2 Accessing liquid CO 2 The pump 37 is pressurized and the pressurized CO 2 The high-temperature flue gas flowing back to the third inlet of the combustion chamber 23 to cool the outlet of the combustion chamber 23 reaches the temperature requirement of the material of the first expander 26, and the Allam cycle power generation process is completed; the smaller strand of liquid nitrogen at the outlet of the fourth tee 19 is fed to the cold flow inlet of the seventh heat exchanger 38 for liquefying the captured CO 2 CO at the outlet of the fifth tee 34 2 The smaller gas enters the sixth compressor to be pressurized, and the pressurized CO 2 The gas is liquefied into high purity liquid CO at the hot inlet end of the seventh heat exchanger 38 2 Subsequently accessing liquid CO 2 Storage tank stores and completes CO 2 A liquefaction process; the nitrogen at the cold flow outlet of the seventh heat exchanger 38 still has a certain cold energy, and is connected to the cold flow inlet end of the eighth heat exchanger 41 to cool the refrigerant, then the low-temperature nitrogen is changed into normal-temperature nitrogen, and the refrigerant at the hot flow outlet of the eighth heat exchanger 41 is connected to the cooling system of the user to complete the cooling process.
It should be apparent that the foregoing embodiments are merely illustrative of the technical aspects of the present invention and not exhaustive, and that although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which are intended to be covered by the scope of the claims.
Claims (8)
1. An air separation coupling Allam circulation power generation system utilizing LNG cold energy comprises an LNG air separation system, an Allam circulation system and CO 2 A liquefaction system and a cooling system; the method is characterized in that: the low-temperature separation of nitrogen and oxygen is carried out by an LNG air separation system; through an Allam circulating system, gasified natural gas and pure oxygen are combusted, generated high-temperature flue gas is expanded to generate power, and simultaneously, liquid oxygen of an air separated product is utilized to carry out high-efficiency CO on the dehydrated high-temperature flue gas 2 Capturing and realizing CO 2 Zero emission, and liquid oxygen is gasified and then used as feed gas for Allam circulation; by CO 2 Liquefaction system for liquefying CO captured by Allam circulation system by using a part of product liquid nitrogen separated by air 2 CO in gaseous state 2 Liquefied into liquid CO 2 The method comprises the steps of carrying out a first treatment on the surface of the And cooling the refrigerant of the cooling system by the cooling system, and providing the cooled refrigerant for the end user to refrigerate.
2. An air separation coupled alam cycle power generation system utilizing LNG cold energy as defined in claim 1, wherein: the LNG air separation system comprises an LNG pump (1), LNG at the outlet of the LNG pump (1) is connected to the cold flow LNG inlet side of a first heat exchanger (2), the cold flow outlet side of the first heat exchanger (2) is connected to the cold flow LNG inlet side of a second heat exchanger (3), the cold flow outlet side of the second heat exchanger (3) is connected to the natural gas inlet of a first tee (4), the hot flow inlet side of the second heat exchanger (3) is an air inlet, the hot flow air outlet side of the second heat exchanger (3) is connected to the air inlet of a first compressor (5), the outlet side of the first compressor (5) is connected to the first hot flow air inlet side of the first heat exchanger (2), the first hot flow outlet side of the first heat exchanger (2) is connected to the hot flow air inlet side of a third heat exchanger (6), the hot flow outlet side of the third heat exchanger (6) is connected to the second inlet of a first rectifying tower (7), the top discharge port of the first rectifying tower (7) is connected to the inlet of a second tee (8), the outlet of the first rectifying tower (7) is connected to the second inlet of a second branch valve (9), and the bottom of the first rectifying tower (7) is connected to the second branch valve (9)(10) The second branch is connected to the inlet side of a third throttle valve (11), the outlet side of a first throttle valve (9) is connected to the second inlet of a second rectifying tower (12), the outlet side of a second throttle valve (10) is connected to the first inlet of the second rectifying tower (12), the outlet side of the third throttle valve (11) is connected to the cold flow inlet side of a fourth heat exchanger (13), the top discharge port of the second rectifying tower (12) is connected to the first cold flow inlet side of a third heat exchanger (6), the cold flow outlet side of the fourth heat exchanger (13) is connected to the second cold flow inlet side of the third heat exchanger (6), the first cold flow outlet side of the third heat exchanger (6) is connected to the nitrogen inlet of a second compressor (14), the second cold flow outlet side of the third heat exchanger (6) is connected to the first inlet of a mixer (15), the outlet side of the second compressor (14) is connected to the second inlet of the fourth heat exchanger (13), the cold flow outlet side of the nitrogen of the mixer (15) is connected to the third heat exchanger (6) is connected to the first inlet of the third heat exchanger (2), the third cold flow outlet side of the third heat exchanger (16) is connected to the third heat exchanger (2) is connected to the first inlet of the third heat exchanger (2), the third heat flow outlet side of the first heat exchanger (2) is connected with the nitrogen inlet of the fourth compressor (17), the outlet of the fourth compressor (17) is connected with the second heat flow nitrogen inlet side of the first heat exchanger (2), the second heat flow outlet side of the first heat exchanger (2) is connected with the nitrogen inlet of the third tee (18), the outlet of the third tee (18) is divided into two branches, the first branch is connected with the first feeding port of the first rectifying tower (7), the second branch is connected with the heat flow inlet side of the fourth heat exchanger (13), the heat flow outlet side of the fourth heat exchanger (13) is connected with the liquid nitrogen inlet of the fourth tee (19), the outlet of the fourth tee (19) is divided into two branches, the first branch is connected with the inlet of the liquid nitrogen storage tank (20), and the second branch is connected with CO 2 A liquefaction system.
3. An air separation coupled alam cycle power generation system utilizing LNG cold energy as defined in claim 1, wherein: the Allam circulating system comprises a liquid oxygen pump (21), wherein liquid oxygen at the outlet of the liquid oxygen pump (21) is connected to the second cold flow liquid oxygen inlet side of a fifth heat exchanger (22), and the second cold flow outlet of the fifth heat exchanger (22)The side of the first three-way device (4) is connected with a pure oxygen inlet of the combustion chamber (23), the natural gas outlet of the first three-way device (4) is divided into two branches, the first branch is connected with a cold flow inlet side of the first heat exchanger (24), the second branch is connected with a natural gas inlet of the fifth compressor (25), the outlet side of the fifth compressor (25) is connected with a natural gas inlet of the combustion chamber (23), the top outlet side of the combustion chamber (23) is connected with a high-temperature flue gas inlet of the first expansion machine (26), the outlet of the first expansion machine (26) is connected with a high-temperature flue gas inlet of the first seawater cooler (27), the outlet of the first seawater cooler (27) is connected with a flue gas inlet of the first separator (28), the outlet of the first separator (28) is connected with a flue gas inlet of the second seawater cooler (29), the outlet of the second seawater cooler (29) is connected with a hot flow inlet side of the sixth heat exchanger (24), the outlet of the second separator (30) is connected with a hot flow inlet side of the fifth heat exchanger (24), the outlet of the second separator (22) is connected with a hot flow inlet of the third heat exchanger (32) of the fifth heat exchanger (22) is connected with a hot flow inlet of the fifth heat exchanger (31), the bottom outlet of the third separator (31) is connected with the third cold flow CO-rich of the fifth heat exchanger (22) 2 The third cold flow outlet side of the fifth heat exchanger (22) is connected with the feed inlet of the fourth separator (33), and the top outlet of the fourth separator (33) is connected with the gaseous CO of the fifth three-way device (34) 2 The inlet and the outlet of the fifth three-way device (34) are divided into two branches, and the second branch is connected with the gaseous CO of the sixth compressor (35) 2 An inlet, an outlet of the sixth compressor (35) is connected with gaseous CO of the third seawater cooler (36) 2 The inlet side, the outlet of the third seawater cooler (36) is connected with liquid CO 2 Liquid CO of pump (37) 2 Inlet, liquid CO 2 The outlet of the pump (37) is connected to the liquid CO of the combustion chamber (23) 2 An inlet.
4. An air separation coupled alam cycle power generation system utilizing LNG cold energy as defined in claim 1, wherein: said CO 2 The liquefaction system comprises a fourth tee (19), a first branch of the fourth tee (19)The outlet is connected with the inlet of the liquid nitrogen storage tank (20), the second outlet is connected with the cold flow liquid nitrogen inlet side of the seventh heat exchanger (38), the hot flow inlet side of the seventh heat exchanger (38) and the gaseous CO of the sixth compressor (39) 2 The outlet is communicated, the working medium inlet side of the sixth compressor (39) is communicated with the first outlet of the fifth three-way device (34), and the hot flow gaseous CO of the seventh heat exchanger (38) 2 The outlet side is connected with liquid CO 2 An inlet of the reservoir (40).
5. An air separation coupled alam cycle power generation system utilizing LNG cold energy as defined in claim 1, wherein: the cooling system comprises a seventh heat exchanger (38), wherein a cold flow outlet side of the seventh heat exchanger (38) is connected with a cold flow inlet side of an eighth heat exchanger (41), and a hot flow inlet side and a hot flow outlet side of the eighth heat exchanger (41) are refrigerants.
6. An air separation coupled alam cycle power generation system utilizing LNG cold energy according to claim 2 or 3, wherein: the working medium at the working medium inlet side of the LNG pump (1) is liquefied natural gas; the outlet working medium of the first tee (4) is natural gas; the working medium of the top discharge port of the first rectifying tower (7) is high-concentration nitrogen; the working medium of the top discharge port of the second rectifying tower (12) is high-concentration nitrogen, and the working medium of the bottom discharge port is high-concentration liquid oxygen; the working medium at the top outlet side of the combustion chamber (23) is high-temperature flue gas; the cold flow outlet of the sixth heat exchanger (24) is natural gas which is conveyed to a pipe network; the working medium at the top outlet side of the third separator (31) is purified gas; the working medium at the top outlet side of the fourth separator (33) is high-concentration CO 2 And (3) gas.
7. An air separation coupled alam cycle power generation system utilizing LNG cold energy as defined in claim 5, wherein: the hot-flow outlet of the eighth heat exchanger (41) is connected with a cooling system of a user.
8. An air separation coupled alam cycle power generation system utilizing LNG cold energy as defined in any one of claims 1, 5, 8, wherein: the refrigerant of the cooling system comprises but is not limited to ethylene glycol, 60% ethylene glycol water solution, propylene glycol solution, 20% calcium chloride solution, R410a and R170.
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