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CN201348420Y - Device capable of producing liquid nitrogen by utilizing cold energy of liquefied natural gas - Google Patents

Device capable of producing liquid nitrogen by utilizing cold energy of liquefied natural gas Download PDF

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Publication number
CN201348420Y
CN201348420Y CNU2008201666683U CN200820166668U CN201348420Y CN 201348420 Y CN201348420 Y CN 201348420Y CN U2008201666683 U CNU2008201666683 U CN U2008201666683U CN 200820166668 U CN200820166668 U CN 200820166668U CN 201348420 Y CN201348420 Y CN 201348420Y
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China
Prior art keywords
heat exchange
nitrogen
runner
natural gas
gas
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Expired - Fee Related
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CNU2008201666683U
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Chinese (zh)
Inventor
何晖
卢杰
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Hangzhou Hangyang Co Ltd
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Hangzhou Hangyang Co Ltd
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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
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/0015—Nitrogen
    • 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"
    • F25J1/0035—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 gas expansion with extraction of work
    • 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"
    • F25J1/0035—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 gas expansion with extraction of work
    • F25J1/0037—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 gas expansion with extraction of work of a return stream
    • 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
    • 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
    • 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
    • F25J1/0221—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 the cold stored in an external cryogenic component in an open refrigeration loop
    • F25J1/0224—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 the cold stored in an external cryogenic component in an open refrigeration loop in combination with an internal quasi-closed refrigeration loop
    • 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
    • F25J1/0288—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings using work extraction by mechanical coupling of compression and expansion of the refrigerant, so-called companders
    • 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.
    • F25J1/0292—Refrigerant compression by cold or cryogenic suction of the refrigerant gas
    • 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/04—Internal refrigeration with work-producing gas expansion loop
    • F25J2270/06—Internal refrigeration with work-producing gas expansion loop with multiple gas expansion loops

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The utility model discloses a device capable of producing liquid nitrogen by utilizing cold energy of liquefied natural gas, which comprises at least a natural gas heat exchanger provided with at least one natural gas heat exchange flow passage. At least four nitrogen gas heat exchange flow passages are arranged on the natural gas heat exchanger; wherein a low temperature nitrogen gas circulator is arranged between the first heat exchange flow passage and the second heat exchange flow passage; a high-temperature pressurizing turboexpander is arranged between the second heat exchange flow passage and the third heat exchange flow passage; a low-temperature pressurizing turboexpander is arranged between the third heat exchange flow passage and the fourth heat exchange flow passage; and the nitrogen gas flowing out from the fourth heat exchange flow passage is connected to a throttle, then to a gas-liquid separator and finally to a subcooler. By making full use of the high-quality cold energy of the liquefied natural gas, the device can produce liquid nitrogen economically. The device can produce 1 kg of liquid nitrogen by only consuming 0.24 KW per hour electricity, while the old air separation device produces 1kg of liquid nitrogen by consuming 0.6-0.8 KW per hour electricity. Therefore, the device has the advantage of remarkable energy saving effect.

Description

Utilize cold energy of liquefied natural gas to obtain the device of liquid nitrogen
Technical field
The utility model relates to a kind of with cold energy of liquefied natural gas recycle, to obtain the device of low temperature liquid nitrogen, belong to the cryogenic technique field.
Background technology
The main component of liquefied natural gas is a methane, and hydrocarbons such as a spot of ethene, ethane, and their are through depickling, processed, and behind the low-temperature liquefaction, its minimum temperature is-162 ℃.Usually, liquefied natural gas is transported to the natural gas line on land and need vaporizes in seawater before, and liquefied natural gas is converted into gaseous state by liquid state and will discharges a large amount of cold (latent heat) in vaporescence.Under 8MPa pressure, liquefied natural gas is 830kJ/kg from liquid-162 ℃ colds that discharge when vaporizing 27 ℃ of environment temperatures.If, not only can overcome local marine site low temperature pollution problems, can also make that the energy is recycling avoids energy waste, thereby obtain great social benefit and economic benefit the like this huge cold recovery of liquefied natural gas.
Nitrogen is mainly used in protective atmosphere, the protection of the inertia in Chemical Manufacture gas, grain stocking, fast food freezing preservation, fruit freshness preserving and the electronics industry etc. of synthetic ammonia, metal heat treatmet.The industrial process of liquid nitrogen is to adopt low temperature processing, produces refrigeration effect by electric power or the acting of steam drive turbocompressor.If the cold recovery of liquefied natural gas is used to substitute the mechanical refrigeration effect of part electric power or steam engine acting, will obtain the liquid nitrogen of cheapness so.
The utility model content
The purpose of this utility model is to overcome conventional method and obtains the shortcoming that liquid nitrogen need consume a large amount of electric energy, and provide a kind of cold energy of liquefied natural gas that can make full use of, with the device of this cold recovery with the acquisition liquid nitrogen, and this device is easy to adapt to existing for producing conventional liquid nitrogen designed system.
The purpose of this utility model is finished by following technical solution, this device includes a heat exchange gas device at least, wherein has a heat exchange gas runner at least, also be provided with four nitrogen heat exchange runners on the described heat exchange gas device at least, wherein be provided with the low temperature nitrogen circulator between the first and second heat exchange runners, be provided with the high temperature pressurised turbo-expander between the second and the 3rd heat exchange runner, be provided with low-temperature turbine boosting expansion machine between the third and fourth heat exchange runner; The nitrogen that comes out through the 4th heat exchange runner is connected to a choke valve, is connected to a subcooler after being connected to a vapour liquid separator again.
The expanding end of described high temperature pressurised turbo-expander be connected to be provided with in the heat exchange gas device can with first of the drag flow hot fluid heat exchange runner that backflows; The expanding end import of described low-temperature turbine boosting expansion machine is connected on the heat exchange gas device with the 4th heat exchange runner and picks out on the 5th heat exchange runner that comes, and its expanding end outlet is connected on the described vapour liquid separator.
The top of described vapour liquid separator is connected to second backflowing on the runner of being provided with in the heat exchange gas device mutually, and flow out this second backflow behind the runner with first backflow nitrogen that runner flows out and connect after again with the raw nitrogen gas tandem.
The utility model belongs to a kind of improvement to prior art, and it has made full use of the high-grade cold energy of liquefied natural gas, can obtain liquid nitrogen economically; The electric consumption of producing 1 kilogram of liquid nitrogen is 0.24 kilowatt. hour, and 1 kilogram of liquid nitrogen electric consumption of traditional air-separating plant production is 0.6～0.8 kilowatt. hour, be 2.5～3.3 times of the device power consumption that proposes of the utility model; Therefore, the utility model patent if can be applied, and will obtain great economic benefit.
Description of drawings
Fig. 1 is a structural principle schematic diagram of the present utility model.
The specific embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.Shown in the accompanying drawing 1, the device that utilizes cold energy of liquefied natural gas to obtain liquid nitrogen described in the utility model which comprises at least a cold energy of liquefied natural gas retracting device of mainly being made up of low temperature nitrogen circulator, nitrogen gas turbine compressor, heat exchange gas device, high temperature pressurised turbo-expander, low-temperature turbine boosting expansion machine, vapour liquid separator and liquid nitrogen subcooler.Described heat exchange gas device, wherein has a heat exchange gas runner at least, also be provided with four nitrogen heat exchange runners on the described heat exchange gas device at least, wherein be provided with the low temperature nitrogen circulator between the first and second heat exchange runners, be provided with the high temperature pressurised turbo-expander between the second and the 3rd heat exchange runner, be provided with low-temperature turbine boosting expansion machine between the third and fourth heat exchange runner; The nitrogen that comes out through the 4th heat exchange runner is connected to a choke valve, is connected to a subcooler after being connected to a vapour liquid separator again.
The expanding end of described high temperature pressurised turbo-expander be connected to be provided with in the heat exchange gas device can with first of the drag flow hot fluid heat exchange runner that backflows; The expanding end import of described low-temperature turbine boosting expansion machine is connected on the heat exchange gas device with the 4th heat exchange runner and picks out on the 5th heat exchange runner that comes, and its expanding end outlet is connected on the described vapour liquid separator.
The top of described vapour liquid separator is connected to second backflowing on the runner of being provided with in the heat exchange gas device mutually, and flow out this second backflow behind the runner with first backflow nitrogen that runner flows out and connect after again with the raw nitrogen gas tandem.
Heat exchange gas device described in the utility model, high temperature pressurised turbo-expander and low temperature nitrogen circulator are connected into high temperature expansion nitrogen kind of refrigeration cycle.
Described heat exchange gas device, low temperature nitrogen circulator, high temperature pressurised turbo-expander, low-temperature turbine boosting expansion machine, vapour liquid separator and liquid nitrogen subcooler are connected into low-temperature expansion nitrogen kind of refrigeration cycle.
Shown in Fig. 1, no oil, the dustless raw nitrogen gas 1 of drawing from air separation unit or outside nitrogen pipeline merge into nitrogen 3 with the nitrogen 2 that backflows, and are compressed to 5～10bar, 5bar the best through nitrogen gas turbine compressor 4; Nitrogen 3 merges into nitrogen 6 with the nitrogen 7 that backflows, and nitrogen 6 enters heat exchange gas device 8 and carries out heat exchange, the cold fluid cooling of being backflowed.
The nitrogen 6 that is cooled is extracted out from the middle and upper part of heat exchange gas device, and the temperature of nitrogen 9 is 180～220K, 180K the best; Nitrogen 9 is sent to low temperature nitrogen circulator 10 and is compressed to 25～35bar, 30bar the best; Nitrogen 11 after the compression is sent into heat exchange gas device 8 once more, the cold fluid cooling of being backflowed.
Cooled nitrogen 12 extract out from the middle part of heat exchange gas device 8 and and be divided into two strands of nitrogen 13,15, nitrogen 13 enters high temperature pressurised turbo-expander pressurized end 14 and is compressed into 35～40bar, 40bar the best; 15 of nitrogen enter high temperature pressurised turbo-expander expanding end 17 and are inflated into nitrogen 18.
After the cold nitrogen 13 that enters high temperature pressurised turbo-expander pressurized end 14 is compressed, nitrogen 16 returns heat exchange gas device 8 once more, extract out from the middle part of heat exchange gas device 8 the cold fluid cooling back of being backflowed, and sends into low-temperature turbine boosting expansion machine pressurized end 20 and compress.
The nitrogen 19 of sending into low-temperature turbine boosting expansion machine pressurized end 20 is compressed to 50～60bar, 55bar the best, nitrogen 21 is divided into two strands of nitrogen 22,37, return heat exchange gas device 8 once more, after the cold fluid cooling that nitrogen 22 is backflowed, extract out, directly deliver to low-temperature turbine boosting expansion machine expanding end 23 and be inflated from the middle and lower part of heat exchange gas device 8; After the cold fluid cooling that nitrogen 37 is backflowed, extract out from the bottom of heat exchange gas device 8, by choke valve 27 throttling expansions, back nitrogen 26 pressure that expand are 5 ~ 10bar, 5bar the best.
After the cold nitrogen 15 that enters high temperature pressurised turbo-expander expanding end 17 was inflated, nitrogen 18 pressure were 5～10bar, 5bar the best; Send into heat exchange gas device 8 from the middle part of heat exchange gas device 8, with the hot fluid heat exchange of drag flow, extract out in the hot junction from heat exchange gas device 8 after the re-heat, converges with nitrogen 5,38, nitrogen 6 is delivered to low temperature nitrogen circulator 10 and is compressed, and forms high temperature expansion nitrogen kind of refrigeration cycle.High temperature expansion nitrogen kind of refrigeration cycle is mainly connected by heat exchange gas device, high temperature pressurised turbo-expander, low temperature nitrogen circulator and pipeline and forms.
Nitrogen 22 is extracted out from the middle and lower part of heat exchange gas device 8, delivers to low-temperature turbine boosting expansion machine expanding end 23 and expand into nitrogen 24, and nitrogen 24 merges with throttling nitrogen 26, and nitrogen 25 enters vapour liquid separator 28.
Extract liquid nitrogen 30 from vapour liquid separator 28 bottoms out, after liquid nitrogen subcooler 29 coolings, can be divided into two strands of liquid nitrogen 31,32.Liquid nitrogen 31 can enter liquid nitrogen storage 34, also can enter the medium pressure column of air separation unit 35, as the external source of air separation unit.
Extract nitrogen out from vapour liquid separator 28 tops, enter the hot fluid heat exchange of heat exchange gas device 8 and drag flow, flow out heat exchange gas device 8 after the re-heat, nitrogen 38 converges with other nitrogen that backflows, and return and enter heat exchange gas device 8, cold fluid heat exchange with backflowing enters low temperature nitrogen circulator 10 after the cooling, form low-temperature expansion nitrogen kind of refrigeration cycle.Low-temperature expansion nitrogen kind of refrigeration cycle is mainly connected by heat exchange gas device, low temperature nitrogen circulator, high temperature pressurised turbo-expander, low-temperature turbine boosting expansion machine, vapour liquid separator, liquid nitrogen subcooler and pipeline and forms.
The pressure of liquefied natural gas 39 can enter 8 heat exchange of heat exchange gas device in 4.0～9.5MPa scope, draw heat exchange gas device 8 with gaseous form nitrogen 40 after the re-heat, enters natural-gas transfer pipeline.

Claims (3)

1, a kind of device that utilizes cold energy of liquefied natural gas to obtain liquid nitrogen, this device includes a heat exchange gas device at least, wherein has a heat exchange gas runner at least, it is characterized in that also being provided with at least on the described heat exchange gas device four nitrogen heat exchange runners, wherein be provided with the low temperature nitrogen circulator between the first and second heat exchange runners, be provided with the high temperature pressurised turbo-expander between the second and the 3rd heat exchange runner, be provided with low-temperature turbine boosting expansion machine between the third and fourth heat exchange runner; The nitrogen that comes out through the 4th heat exchange runner is connected to a choke valve, is connected to a subcooler after being connected to a vapour liquid separator again.
2, the device that utilizes cold energy of liquefied natural gas to obtain liquid nitrogen according to claim 1, the expanding end that it is characterized in that described high temperature pressurised turbo-expander be connected to be provided with in the heat exchange gas device can with first of the drag flow hot fluid heat exchange runner that backflows; The expanding end import of described low-temperature turbine boosting expansion machine is connected on the heat exchange gas device with the 4th heat exchange runner and picks out on the 5th heat exchange runner that comes, and its expanding end outlet is connected on the described vapour liquid separator.
3, the device that utilizes cold energy of liquefied natural gas to obtain liquid nitrogen according to claim 2, the top that it is characterized in that described vapour liquid separator is connected to second backflowing on the runner of being provided with in the heat exchange gas device mutually, and flow out this second backflow behind the runner with first backflow nitrogen that runner flows out and connect after again with the raw nitrogen gas tandem.
CNU2008201666683U 2008-10-21 2008-10-21 Device capable of producing liquid nitrogen by utilizing cold energy of liquefied natural gas Expired - Fee Related CN201348420Y (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102141337A (en) * 2011-03-30 2011-08-03 苏州市兴鲁空分设备科技发展有限公司 Method for separating air
CN101392981B (en) * 2008-10-21 2011-10-05 杭州杭氧股份有限公司 Method and apparatus for obtaining liquid nitrogen by utilizing liquefied natural gas cold energy
CN103712414A (en) * 2013-12-31 2014-04-09 苏州制氧机有限责任公司 Natural gas liquefaction device and liquefaction process of natural gas liquefaction device
CN103712413A (en) * 2013-12-31 2014-04-09 苏州制氧机有限责任公司 Natural gas liquefaction device
CN104197635A (en) * 2014-09-17 2014-12-10 刘国满 Port staying re-liquefaction system and liquefaction method for LNG (liquefied natural gas) fuel powered ship
CN105408713A (en) * 2013-07-31 2016-03-16 通用电气公司 System and integrated method for liquid natural gas production
CN107429967A (en) * 2015-03-17 2017-12-01 西亚德汽车系统股份公司 Carry out the equipment of liquid nitrogen using the cold energy recovery obtained from the evaporation of liquefied natural gas

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101392981B (en) * 2008-10-21 2011-10-05 杭州杭氧股份有限公司 Method and apparatus for obtaining liquid nitrogen by utilizing liquefied natural gas cold energy
CN102141337A (en) * 2011-03-30 2011-08-03 苏州市兴鲁空分设备科技发展有限公司 Method for separating air
CN102141337B (en) * 2011-03-30 2013-05-01 苏州市兴鲁空分设备科技发展有限公司 Method for separating air
CN105408713A (en) * 2013-07-31 2016-03-16 通用电气公司 System and integrated method for liquid natural gas production
CN105408713B (en) * 2013-07-31 2018-06-26 通用电气公司 For the system and integrated approach of liquid natural gas production
CN103712414A (en) * 2013-12-31 2014-04-09 苏州制氧机有限责任公司 Natural gas liquefaction device and liquefaction process of natural gas liquefaction device
CN103712413A (en) * 2013-12-31 2014-04-09 苏州制氧机有限责任公司 Natural gas liquefaction device
CN103712413B (en) * 2013-12-31 2018-08-17 苏州制氧机有限责任公司 A kind of natural gas liquefaction device
CN103712414B (en) * 2013-12-31 2018-08-17 苏州制氧机有限责任公司 A kind of natural gas liquefaction device and its liquefaction process
CN104197635A (en) * 2014-09-17 2014-12-10 刘国满 Port staying re-liquefaction system and liquefaction method for LNG (liquefied natural gas) fuel powered ship
CN107429967A (en) * 2015-03-17 2017-12-01 西亚德汽车系统股份公司 Carry out the equipment of liquid nitrogen using the cold energy recovery obtained from the evaporation of liquefied natural gas
CN107429967B (en) * 2015-03-17 2020-03-10 西亚德汽车系统股份公司 Plant for liquefying nitrogen using cold energy recovery obtained from the evaporation of liquefied natural gas

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