CN104266454A - Liquefied natural gas production system with gas-supercritical carbon dioxide united power - Google Patents
Liquefied natural gas production system with gas-supercritical carbon dioxide united power Download PDFInfo
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- CN104266454A CN104266454A CN201410452763.XA CN201410452763A CN104266454A CN 104266454 A CN104266454 A CN 104266454A CN 201410452763 A CN201410452763 A CN 201410452763A CN 104266454 A CN104266454 A CN 104266454A
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- natural gas
- carbon dioxide
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 104
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 60
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 149
- 239000003345 natural gas Substances 0.000 claims abstract description 70
- 239000007789 gas Substances 0.000 claims abstract description 65
- 239000000446 fuel Substances 0.000 claims abstract description 9
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 124
- 239000001294 propane Substances 0.000 claims description 62
- 238000005057 refrigeration Methods 0.000 claims description 37
- 238000002485 combustion reaction Methods 0.000 claims description 31
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 28
- 239000012530 fluid Substances 0.000 claims description 28
- 239000000567 combustion gas Substances 0.000 claims description 22
- 230000008676 import Effects 0.000 claims description 19
- 238000005183 dynamical system Methods 0.000 claims description 16
- 238000011084 recovery Methods 0.000 claims description 16
- 239000005977 Ethylene Substances 0.000 claims description 14
- 239000007791 liquid phase Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 12
- 239000012071 phase Substances 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 10
- 238000013459 approach Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000005658 nuclear physics Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
- F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
- F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
- F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
- F25J1/008—Hydrocarbons
- F25J1/0085—Ethane; Ethylene
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
- F25J1/008—Hydrocarbons
- F25J1/0087—Propane; Propylene
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0207—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as at least a three level SCR refrigeration cascade
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
- F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0235—Heat exchange integration
- F25J1/0242—Waste heat recovery, e.g. from heat of compression
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0281—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc. characterised by the type of prime driver, e.g. hot gas expander
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0281—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc. characterised by the type of prime driver, e.g. hot gas expander
- F25J1/0283—Gas turbine as the prime mechanical driver
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
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- 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
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/62—Separating low boiling components, e.g. He, H2, N2, Air
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- 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
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/64—Separating heavy hydrocarbons, e.g. NGL, LPG, C4+ hydrocarbons or heavy condensates in general
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- 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
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/80—Hot exhaust gas turbine combustion engine
- F25J2240/82—Hot exhaust gas turbine combustion engine with waste heat recovery, e.g. in a combined cycle, i.e. for generating steam used in a Rankine cycle
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Abstract
The invention discloses a liquefied natural gas production system with gas-supercritical carbon dioxide united power. The liquefied natural gas production system comprises three gas turbine power systems, three supercritical carbon dioxide Brayton cycle power systems and a liquefied natural gas production system part. According to the liquefied natural gas production system, natural gas is used as fuel of gas turbines, exhaust gas of the gas turbines is used as heat sources of the supercritical carbon dioxide Brayton cycle power systems to realize a gas-supercritical carbon dioxide united power cycle, and power generated during the gas-supercritical carbon dioxide united power cycle is used as the power required by the whole liquefied natural gas production system; liquefied natural gas produced by the whole system is output, and the efficiency of the system is improved. By means of the liquefied natural gas production system, stable power sources can be provided and used by the whole system itself, the produced liquefied natural gas is output, the overall efficiency of the system is improved, and meanwhile a new thought is provided for application of a supercritical carbon dioxide Brayton power cycle and production of the liquefied natural gas.
Description
[technical field]
The invention belongs to the technical field that natural gas is produced, be specifically related to the liquefied natural gas (LNG) production system of a kind of combustion gas-supercritical carbon dioxide combined power.
[background technology]
Liquefied natural gas (Liquefied Natural Gas) is called for short LNG, is the nowadays fastest-rising a kind of fuel in the world.LNG refers to the liquified natural gas under ultralow temperature (-162 DEG C), low pressure (atmospheric pressure) condition, and its component is mainly: methane (CH
4), colourless, tasteless, the nontoxic and non-corrosiveness of LNG, its volume is about 1/600 of homogenous quantities gaseous natural gas volume, that is can obtain the natural gas of 600 cubic metres after every cubic metre of LNG gasification.The density of LNG is about 45% of consubstantiality ponding.Because the place of production is different, the composition of LNG also can slightly change, and wherein the excursion of methane is 85% ~ 98%.This is just also the heating value of liquefied natural gas of the Different sources reason different with rate of gasification, and its density also there will be corresponding fluctuation.
LNG is aborning through pretreatment, and the content of methane is more than 90%.Its pollutant discharge amount has and reduces greatly.In addition, in city, winter uses gas peak period, and LNG can as the important means of city gas peak shaving, so extensive market.LNG is as motor vehicle fuel, and the discharge capacity of carbon monoxide, soot significantly reduces, and will play extremely important effect to environmental protect quality.The appearance of National Environment Policy Act rule and automobile exhaust emission standard is that LNG development of automobile provides wide development space, also promotes the fast development of auto industry.
Basic research is the necessary guarantee of rapid industrial development, and the production domesticization accelerating LNG industry, to the LNG production cost reducing China, advances the raising of the LNG technical merit of China significant.In addition, LNG industry is the industry of a technology-intensive and high added value, relates to a lot of device fabrication, develop the fast development that this industry will stimulate domestic industries in its industrial chain.Supercritical fluid is utilized to intend critical zone physical property jumping phenomenon, compressor operating point is arranged on the large density region near pseudo-critical temperature, low density area after heat exchanger operating point is arranged on pseudo-critical temperature, can under the gas-cooled prerequisite of guarantee, reduce compression power consumption, realize higher efficiency.This character of supercritical fluid makes it have obvious advantage as during power conversion working medium.Carbon dioxide (CO
2) due to its critical pressure rather moderate (7.38 MPa), there is good stability and nuclear physics character, the character of inert gas is shown in certain temperature range, and the characteristic such as it is nontoxic, rich reserves, natural existence, be considered to one of the Energy Transfer and power conversion working medium of most application prospect.Due to supercritical carbon dioxide (S-CO
2) within the scope of certain operational factor, density is comparatively large and without phase transformation, therefore with supercritical carbon dioxide (S-CO
2) be dynamical system compact equipment, the small volume such as compressor, gas-turbine of working medium.The each combination of Brayton cycle can the electric power of output 20 MW, takes up room and only have four cubic meters.Supercritical carbon dioxide (S-CO
2) Bretton (Brayton) circulation turbine is generally used for large-scale heating power and nuclear energy power generation aspect, comprise power reactor of future generation, target is that (efficiency is lower for the steam-powered Rankine cycle turbine of final replacement, there is corrosivity in hot conditions, simultaneously owing to needing very large turbine and condenser to process unnecessary steam, taking up room is 30 times).
[summary of the invention]
The object of the invention is to for the deficiencies in the prior art, provide the liquefied natural gas (LNG) production system of a kind of combustion gas-supercritical carbon dioxide combined power, this production system can improve entire system efficiency, can be supercritical carbon dioxide (S-CO simultaneously
2) utilization of Bretton (Brayton) power cycle provides new approaches.
For achieving the above object, the technical solution used in the present invention is:
The liquefied natural gas (LNG) production system of combustion gas-supercritical carbon dioxide combined power, comprises three cover Gas Turbine Power Systems, three cover supercritical carbon dioxide Brayton cycle dynamical system and a set of natural gas liquefaction production systems; Wherein,
Every suit Gas Turbine Power System comprises the first compressor bank, first compressor bank is provided with air intake, the gas vent of the first compressor bank is connected with the gas access of burner, burner is provided with fuel inlet, the outlet of burner is connected with the import of combustion gas turbine, and the outlet of combustion gas turbine is connected with the first import of heat exchanger;
Every suit supercritical carbon dioxide Brayton cycle dynamical system comprises regenerator, the low temperature side fluid intake of regenerator is communicated with the fluid issuing of the second compressor bank, the low temperature side fluid issuing of regenerator is connected with the second import of heat exchanger in corresponding a set of Gas Turbine Power System, the high temperature side fluid inlet of regenerator and the outlet of steam turbine, the high temperature side fluid issuing of regenerator and the inlet communication of cooler, the outlet of cooler and the inlet communication of the second compressor bank, the outlet of heat exchanger and the inlet communication of steam turbine in corresponding a set of Gas Turbine Power System,
Natural gas liquefaction production system comprises a point flow container, and a point flow container is provided with gas inlet, and the outlet of point flow container is connected by pipe-and-filter entrance, the outlet of filter and de-CO
2the import of tower connects, de-CO
2the outlet of tower is connected with the entrance of drier, the outlet of drier is connected with the gas inlet of middle pressure propane heat exchanger, the gas outlet of middle pressure propane heat exchanger is connected with the gas inlet of low-pressure propane heat exchanger, the propane outlets of middle pressure propane heat exchanger is connected with the entrance of middle pressure propane refrigeration recycle compressor, the propane inlet of middle pressure propane heat exchanger is connected with the outlet of middle pressure propane refrigeration recycle compressor, the gas outlet of low-pressure propane heat exchanger is connected with the entrance of high-pressure natural gas separator, the propane outlets of low-pressure propane heat exchanger is connected with the entrance of low-pressure propane kind of refrigeration cycle compressor, the propane inlet of low-pressure propane heat exchanger is connected with the outlet of low-pressure propane kind of refrigeration cycle compressor, high-pressure natural gas separator is connected with low-pressure propane heat exchanger again by pipeline, as the passage that liquid phase returns, first throttle valve is installed between low-pressure propane heat exchanger and high-pressure natural gas separator, the outlet of high-pressure natural gas separator is connected with the Imported gas of ethene heat exchanger, the gas outlet of ethene heat exchanger is connected with the middle Imported gas of LNG heat exchanger of pressing, the ethene outlet of ethene heat exchanger is connected with the entrance of ethylene refrigeration recycle compressor, the ethylene inlet of ethene heat exchanger is connected with the outlet of ethylene refrigeration recycle compressor, the outlet of middle pressure LNG heat exchanger is connected with middle pressure natural-gas separator, middle pressure natural-gas separator is connected with middle LNG heat exchanger of pressing again by pipeline, as the recovery approach of gas phase, between middle pressure LNG heat exchanger and middle pressure natural-gas separator, second throttle is installed, the outlet of middle pressure natural-gas separator is connected with the import of low pressure LNG heat exchanger, the outlet of low pressure LNG heat exchanger is connected with the import of low pressure natural gas separator, 3rd choke valve is installed between low pressure LNG heat exchanger and low pressure natural gas separator, the outlet of low pressure natural gas separator is connected with the import of LNG storage tank, low pressure natural gas separator is connected with low pressure LNG heat exchanger by pipeline again with LNG storage tank, as the recovery approach of gas phase, low pressure LNG heat exchanger is connected with middle LNG heat exchanger of pressing again by pipeline, as the recovery approach of gas phase,
The rotating shaft of middle pressure propane refrigeration recycle compressor is connected with the rotating shaft of steam turbine in first set combustion gas-supercritical carbon dioxide combined power system Middle combustion engine turbine and first set supercritical carbon dioxide Brayton cycle dynamical system;
The rotating shaft that rotating shaft and the second combustion engine turbine and second overlapped in combustion gas-supercritical carbon dioxide combined power system of low-pressure propane kind of refrigeration cycle compressor overlaps steam turbine in supercritical carbon dioxide Brayton cycle dynamical system is connected;
The rotating shaft and the 3rd of ethylene refrigeration recycle compressor is overlapped the rotating shaft that combustion gas-supercritical carbon dioxide combined power system Middle combustion engine turbine and the 3rd overlaps steam turbine in supercritical carbon dioxide Brayton cycle dynamical system and is connected.
The present invention improves further and is: LNG storage tank is also provided with the outer defeated interface of LNG.
The present invention improves further and is: the heat exchanger in every suit Gas Turbine Power System is also provided with the outlet connecting chimney.
The present invention improves further and is: the outlet point flow container being also provided with the liquid removed in raw natural gas.
The present invention improves further and is: middle pressure propane heat exchanger is also provided with and connects liquid phase and to backflow the outlet of receiving system of cold recovery.
The present invention improves further and is: middle pressure LNG heat exchanger is also provided with and connects liquid phase and to backflow the first receiving device of cold recovery and the outlet of the second receiving system.
Compared with prior art, the present invention has following advantage:
Gas Turbine Power System of the present invention comprises compressor bank, the gas vent of this compressor bank is connected with the entrance of burner, the outlet of burner is connected with the import of combustion engine turbine, through pretreated fuel and the air mixed combustion in the burner via compressor bank compression, form high-temperature fuel gas and enter combustion gas turbine acting, combustion gas turbine outputting power, the exhaust of combustion gas turbine enters heat exchanger and carries out heat exchange, and the exhaust steam after heat exchange is discharged from chimney.
Supercritical carbon dioxide (S-CO of the present invention
2) Bretton (Brayton) Circulated power system comprises regenerator, the low temperature side fluid intake of regenerator and the outlet of compressor bank, the low temperature side fluid issuing of regenerator is connected with the import of heat exchanger, the high temperature side fluid inlet of regenerator and the outlet of gas-turbine, the high temperature side fluid issuing of regenerator and the inlet communication of cooler, the carbon dioxide compressed unit compression boosting of low-temp low-pressure, again after the preheating of regenerator high temperature side fluid, enter heat exchanger and carry out heat exchange, steam turbine acting is directly entered after absorbing heat, steam turbine is by axle system outputting power, weary gas after acting is after low temperature side fluid cooling in regenerator, required compressor bank inlet temperature is cooled to again by cooler, finally enter compressor bank from cooler outlet, realize closed cycle.
Natural gas liquefaction device system of the present invention comprises a point flow container, after raw natural gas enters natural gas liquefaction device system, first the liquid in point flow container removal unstripped gas is entered, then the natural gas removed after liquid enters metre filter and falls the large liquid of particle diameter and solid, and the natural gas after filtration enters de-CO
2tower, removes CO by monoethanolamine (MEA) method
2, de-CO
2after natural gas mole sieve drier carry out processed.Have two driers to switch in pretreatment process to use, a wherein drying, another regeneration.Natural gas after purification, enter the middle pressure propane heat exchanger and low-pressure propane heat exchanger that utilize propane refrigeration to circulate successively, then after first throttle valve throttling cooling, enter high-pressure natural gas separator and carry out gas-liquid separation, liquid phase is backflowed, cold recovery, the gas phase produced passes through the ethene heat exchanger and the cooling of middle pressure LNG heat exchanger that utilize ethylene refrigeration to circulate successively, after cooling, throttling cooling is carried out again through second throttle, middle pressure natural-gas separator is entered after throttling cooling, the liquid phase produced in middle pressure natural-gas separator enters low pressure natural gas separator further after the cooling of low pressure LNG heat exchanger and the 3rd choke valve throttling, in low pressure natural gas separator, gas phase is backflowed cold recovery, liquid phase flows into LNG storage tank and stores.
The present invention uses natural gas as the fuel of gas turbine, for the exhaust of gas turbine as supercritical carbon dioxide (S-CO
2) thermal source of Bretton (Brayton) Circulated power system realizes combustion gas-supercritical carbon dioxide combined power circulation, the power needed for the whole liquefied natural gas of power supply (LNG) production system produced and combustion gas-supercritical carbon dioxide combined power circulates, liquefied natural gas (LNG) supply that whole system is produced exports, both provide stable power resources, turn improve the whole efficiency of system.Combine Gas Turbine Power System, supercritical carbon dioxide (S-CO
2) Bretton (Brayton) Circulated power system and natural gas liquefaction production system, stable power resources are provided, supply whole system self uses, liquefied natural gas (LNG) supply of producing exports, improve entire system efficiency, be supercritical carbon dioxide (S-CO simultaneously
2) utilization of Bretton (Brayton) power cycle and the production of liquefied natural gas (LNG) provides new thinking.
[accompanying drawing explanation]
Fig. 1 is the structural representation of the liquefied natural gas (LNG) production system of combustion gas of the present invention-supercritical carbon dioxide combined power.
In figure: 1, the first compressor bank, 2, burner, 3, combustion gas turbine, 4, heat exchanger package, 5, regenerator, 6, cooler, the 7, second compressor bank, 8, steam turbine, 9, point flow container, 10, filter, 11, de-CO
2tower, 12, drier, 13, middle pressure propane heat exchanger, 14, middle pressure propane refrigeration recycle compressor, 15, low-pressure propane heat exchanger, 16, low-pressure propane kind of refrigeration cycle compressor, 17, first throttle valve, 18, high-pressure natural gas separator, 19, ethene heat exchanger, 20, ethylene refrigeration recycle compressor, 21, middle pressure LNG heat exchanger, 22, second throttle, 23, middle pressure natural-gas separator, 24, low pressure LNG heat exchanger, the 25, the 3rd choke valve, 26, low pressure natural gas separator, 27, LNG storage tank.
[detailed description of the invention]
Below in conjunction with accompanying drawing, the present invention is described in further details.
See Fig. 1, the liquefied natural gas (LNG) production system of combustion gas of the present invention-supercritical carbon dioxide combined power, comprises Gas Turbine Power System, supercritical carbon dioxide (S-CO
2) Bretton (Brayton) Circulated power system and natural gas liquefaction production system.
Wherein, Gas Turbine Power System comprises the first compressor bank 1, burner 2, combustion gas turbine 3 and heat exchanger 4, first compressor bank 1 is provided with air intake, burner 2 is provided with fuel inlet, the gas vent of the first compressor bank 1 is communicated with the entrance of burner 2, the outlet of burner 2 is connected with the import of combustion gas turbine 3, and the outlet of combustion gas turbine 3 is connected with the first import of heat exchanger 4; Pretreated fuel and the air mixed combustion in burner 2 compressed via the first compressor bank 1, form high-temperature fuel gas and enter acting in combustion gas turbine 3, combustion gas turbine 3 is by axle system outputting power, and the exhaust of combustion gas turbine 3 enters heat exchanger package 4 and carries out heat exchange, discharges after heat exchange from chimney.After combustion gas turbine 3, be provided with heat exchanger package 4, realize the energy transferring between Gas Turbine Power System and supercritical carbon dioxide Brayton cycle dynamical system.
Supercritical carbon dioxide (S-CO
2) Bretton (Brayton) Circulated power system use supercritical carbon dioxide be working medium, comprise regenerator 5, cooler 6, second compressor bank 7 and steam turbine 8, the low temperature side fluid intake of regenerator 5 is communicated with the fluid issuing of the second compressor bank 7, the low temperature side fluid issuing of regenerator 5 is connected with the second import of heat exchanger 4 in corresponding a set of Gas Turbine Power System, the high temperature side fluid inlet of regenerator 5 and the outlet of steam turbine 8, the high temperature side fluid issuing of regenerator 5 and the inlet communication of cooler 6, the outlet of cooler 6 and the inlet communication of the second compressor bank 7, the outlet of heat exchanger 4 and the inlet communication of steam turbine 8 in corresponding a set of Gas Turbine Power System, the CO of low-temp low-pressure
2gas compresses after boosting through the second compressor bank 7, regenerator 5 is entered along low temperature side fluid line, after high temperature side fluid preheating in regenerator 5, enter heat exchanger 4 and carry out heat exchange, after supercritical fluid absorbs heat, directly enter steam turbine 8 to do work, steam turbine 8 is by axle system outputting power, weary gas after acting enters regenerator 5 along high temperature side fluid line, after low temperature side fluid cooling in regenerator 5, enter cooler 6, required compressor bank inlet temperature is cooled to by cooler 6, finally enter the second compressor bank 7 from cooler outlet, realize closed cycle.
Natural gas liquefaction device system comprises point flow container 9, filter 10, the de-CO that connect successively
2tower 11, drier 12, middle pressure propane heat exchanger 13, middle pressure propane refrigeration recycle compressor 14, low-pressure propane heat exchanger 15, low-pressure propane kind of refrigeration cycle compressor 16, first throttle valve 17, high-pressure natural gas separator 18, ethene heat exchanger 19, ethylene refrigeration recycle compressor 20, middle pressure LNG heat exchanger 21, second throttle 22, middle pressure natural-gas separator 23, low pressure LNG heat exchanger 24, the 3rd choke valve 25, low pressure natural gas separator 26 and LNG storage tank 27, a point flow container 9 is provided with gas inlet; After raw natural gas enters natural gas liquefaction device system, first enter point flow container 9 and remove liquid in unstripped gas, then the natural gas removed after liquid enters filter 10 and filters out the large liquid of particle diameter and solid, and the natural gas after filtration enters de-CO
2tower 11, removes CO by monoethanolamine (MEA) method
2, de-CO
2after natural gas mole sieve drier 12 carry out processed.Have two driers to switch in pretreatment process to use, a wherein drying, another regeneration.Natural gas after purification, enter in utilization the low-pressure propane heat exchanger 15 of middle pressure propane heat exchanger 13 and low-pressure propane kind of refrigeration cycle compressor 16 driving of pressing propane refrigeration recycle compressor 14 to drive successively, then after first throttle valve 17 throttling cooling, enter high-pressure natural gas separator 18 and carry out gas-liquid separation, liquid phase is backflowed, cold recovery, the gas phase produced cools through the ethene heat exchanger 19 of ethylene refrigeration recycle compressor 20 driving and middle pressure LNG heat exchanger 21 successively, after cooling, throttling cooling is carried out again through second throttle 22, middle pressure natural-gas separator 23 is entered after throttling cooling, the liquid phase produced in middle pressure natural-gas separator 23 cools through low pressure LNG heat exchanger 24 further and enters low pressure natural gas separator 26 after the 3rd choke valve 25 throttling, in low pressure natural gas separator 26, gas phase is backflowed cold recovery, liquid phase flows into LNG storage tank 27 and stores.Wherein, first throttle valve 17, second throttle 22 and the 3rd choke valve 25 are respectively in order to realize gas-liquid separation.
In addition, the rotating shaft of middle pressure propane refrigeration recycle compressor 14 is connected with the rotating shaft of steam turbine 8 in first set combustion gas-supercritical carbon dioxide combined power system Middle combustion engine turbine 3 and first set supercritical carbon dioxide Brayton cycle dynamical system, provides power to middle pressure propane refrigeration recycle compressor 14 by this combustion engine turbine 3 and steam turbine 8; Combustion engine turbine 3 in combustion gas-supercritical carbon dioxide combined power system is overlapped in the rotating shaft and second of low-pressure propane kind of refrigeration cycle compressor 16 and the second rotating shaft of overlapping steam turbine 8 in supercritical carbon dioxide Brayton cycle dynamical system is connected, and provides power to low-pressure propane kind of refrigeration cycle compressor 16 by this combustion engine turbine 3 and steam turbine 8; Combustion gas-supercritical carbon dioxide combined power system Middle combustion engine turbine 3 is overlapped in the rotating shaft and the 3rd of ethylene refrigeration recycle compressor 20 and the 3rd rotating shaft of overlapping steam turbine 8 in supercritical carbon dioxide Brayton cycle dynamical system is connected, and provides power to ethylene refrigeration recycle compressor 20 by this combustion engine turbine 3 and steam turbine 8.
Further, LNG storage tank 27 is also provided with the outer defeated interface of LNG.Heat exchanger 4 in every suit Gas Turbine Power System is also provided with the outlet connecting chimney.Divide outlet flow container 9 being also provided with the liquid removed in raw natural gas.Middle pressure propane heat exchanger 13 is also provided with and connects liquid phase and to backflow the outlet of receiving system of cold recovery.Middle pressure LNG heat exchanger 21 is also provided with and connects liquid phase and to backflow the first receiving device of cold recovery and the outlet of the second receiving system.
Supercritical carbon dioxide (S-CO of the present invention
2) in Bretton (Brayton) Circulated power system, due to supercritical carbon dioxide (S-CO
2) within the scope of certain operational factor, density is comparatively large and without phase transformation, therefore with supercritical carbon dioxide (S-CO
2) be dynamical system compact equipment, the small volume such as compressor, gas-turbine of working medium, both cost-saving, save space again.
In natural gas liquefaction device system, can make full use of the feature (12MPa) of natural gas well self high pressure, be energy with gas pressure, takes separation, dehydration, de-CO
2, after the pretreatment such as de-heavy hydrocarbon, through classification refrigeration, partial liquefaction technique, make natural gas liquefaction.The present invention, compared with external " nitrogen+methane " hybrid refrigeration cycle technique usually adopted, has the features such as yield is high, small investment, energy consumption are low, operating cost is low, reliable.
Claims (6)
1. the liquefied natural gas (LNG) production system of combustion gas-supercritical carbon dioxide combined power, is characterized in that: comprise three cover Gas Turbine Power Systems, three cover supercritical carbon dioxide Brayton cycle dynamical system and a set of natural gas liquefaction production systems; Wherein,
Every suit Gas Turbine Power System comprises the first compressor bank (1), first compressor bank (1) is provided with air intake, the gas vent of the first compressor bank (1) is connected with the gas access of burner (2), burner (2) is provided with fuel inlet, the outlet of burner (2) is connected with the import of combustion gas turbine (3), and the outlet of combustion gas turbine (3) is connected with the first import of heat exchanger (4);
Every suit supercritical carbon dioxide Brayton cycle dynamical system comprises regenerator (5), the low temperature side fluid intake of regenerator (5) is communicated with the fluid issuing of the second compressor bank (7), the low temperature side fluid issuing of regenerator (5) is connected with the second import of heat exchanger (4) in corresponding a set of Gas Turbine Power System, the high temperature side fluid inlet of regenerator (5) and the outlet of steam turbine (8), the high temperature side fluid issuing of regenerator (5) and the inlet communication of cooler (6), the outlet of cooler (6) and the inlet communication of the second compressor bank (7), the outlet of heat exchanger (4) and the inlet communication of steam turbine (8) in corresponding a set of Gas Turbine Power System,
Natural gas liquefaction production system comprises a point flow container (9), flow container (9) is divided to be provided with gas inlet, the outlet of flow container (9) is divided to be connected by pipe-and-filter (10) entrance, the outlet of filter (10) and de-CO
2the import of tower (11) connects, de-CO
2the outlet of tower (11) is connected with the entrance of drier (12), the outlet of drier (12) is connected with the gas inlet of middle pressure propane heat exchanger (13), the gas outlet of middle pressure propane heat exchanger (13) is connected with the gas inlet of low-pressure propane heat exchanger (15), the propane outlets of middle pressure propane heat exchanger (13) is connected with the entrance of middle pressure propane refrigeration recycle compressor (14), the propane inlet of middle pressure propane heat exchanger (13) is connected with the outlet of middle pressure propane refrigeration recycle compressor (14), the gas outlet of low-pressure propane heat exchanger (15) is connected with the entrance of high-pressure natural gas separator (18), the propane outlets of low-pressure propane heat exchanger (15) is connected with the entrance of low-pressure propane kind of refrigeration cycle compressor (16), the propane inlet of low-pressure propane heat exchanger (15) is connected with the outlet of low-pressure propane kind of refrigeration cycle compressor (16), high-pressure natural gas separator (18) is connected with low-pressure propane heat exchanger (15) again by pipeline, as the passage that liquid phase returns, first throttle valve (17) is installed between low-pressure propane heat exchanger (15) and high-pressure natural gas separator (18), the outlet of high-pressure natural gas separator (18) is connected with the Imported gas of ethene heat exchanger (19), the gas outlet of ethene heat exchanger (19) is connected with the middle Imported gas of LNG heat exchanger (21) of pressing, the ethene outlet of ethene heat exchanger (19) is connected with the entrance of ethylene refrigeration recycle compressor (20), the ethylene inlet of ethene heat exchanger (19) is connected with the outlet of ethylene refrigeration recycle compressor (20), the outlet of middle pressure LNG heat exchanger (21) is connected with middle pressure natural-gas separator (23), middle pressure natural-gas separator (23) is connected with middle LNG heat exchanger (21) of pressing again by pipeline, as the recovery approach of gas phase, between middle pressure LNG heat exchanger (21) and middle pressure natural-gas separator (23), second throttle (22) is installed, the outlet of middle pressure natural-gas separator (23) is connected with the import of low pressure LNG heat exchanger (24), the outlet of low pressure LNG heat exchanger (24) is connected with the import of low pressure natural gas separator (26), 3rd choke valve (25) is installed between low pressure LNG heat exchanger (24) and low pressure natural gas separator (26), the outlet of low pressure natural gas separator (26) is connected with the import of LNG storage tank (27), low pressure natural gas separator (26) is connected with low pressure LNG heat exchanger (24) by pipeline again with LNG storage tank (27), as the recovery approach of gas phase, low pressure LNG heat exchanger (24) is connected with middle LNG heat exchanger (21) of pressing again by pipeline, as the recovery approach of gas phase,
The rotating shaft of middle pressure propane refrigeration recycle compressor (14) is connected with the rotating shaft of steam turbine (8) in first set combustion gas-supercritical carbon dioxide combined power system Middle combustion engine turbine (3) and first set supercritical carbon dioxide Brayton cycle dynamical system;
The rotating shaft that rotating shaft and the second combustion engine turbine (3) and second overlapped in combustion gas-supercritical carbon dioxide combined power system of low-pressure propane kind of refrigeration cycle compressor (16) overlaps steam turbine (8) in supercritical carbon dioxide Brayton cycle dynamical system is connected;
The rotating shaft and the 3rd of ethylene refrigeration recycle compressor (20) is overlapped the rotating shaft that combustion gas-supercritical carbon dioxide combined power system Middle combustion engine turbine (3) and the 3rd overlaps steam turbine (8) in supercritical carbon dioxide Brayton cycle dynamical system and is connected.
2. the liquefied natural gas (LNG) production system of combustion gas according to claim 1-supercritical carbon dioxide combined power, is characterized in that: LNG storage tank (27) is also provided with the outer defeated interface of LNG.
3. the liquefied natural gas (LNG) production system of combustion gas according to claim 1-supercritical carbon dioxide combined power, is characterized in that: the heat exchanger (4) in every suit Gas Turbine Power System is also provided with the outlet connecting chimney.
4. the liquefied natural gas (LNG) production system of combustion gas according to claim 1-supercritical carbon dioxide combined power, is characterized in that: the outlet point flow container (9) being also provided with the liquid removed in raw natural gas.
5. the liquefied natural gas (LNG) production system of combustion gas according to claim 1-supercritical carbon dioxide combined power, is characterized in that: middle pressure propane heat exchanger (13) is also provided with and connects liquid phase and to backflow the outlet of receiving system of cold recovery.
6. the liquefied natural gas (LNG) production system of combustion gas according to claim 1-supercritical carbon dioxide combined power, is characterized in that: middle pressure LNG heat exchanger (21) is also provided with and connects liquid phase and to backflow the first receiving device of cold recovery and the outlet of the second receiving system.
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| CN110849073A (en) * | 2019-09-29 | 2020-02-28 | 西安交通大学 | LNG cold energy comprehensive utilization system |
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Application publication date: 20150107 |