CN113310281A - Liquid air production device utilizing LNG cold energy - Google Patents

Liquid air production device utilizing LNG cold energy Download PDF

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Publication number
CN113310281A
CN113310281A CN202110662769.XA CN202110662769A CN113310281A CN 113310281 A CN113310281 A CN 113310281A CN 202110662769 A CN202110662769 A CN 202110662769A CN 113310281 A CN113310281 A CN 113310281A
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CN
China
Prior art keywords
cold energy
air
liquid
lng
lng cold
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Pending
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CN202110662769.XA
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Chinese (zh)
Inventor
季伟
郭璐娜
陈六彪
崔晨
郭嘉
王俊杰
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Technical Institute of Physics and Chemistry of CAS
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Technical Institute of Physics and Chemistry of CAS
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Priority to CN202110662769.XA priority Critical patent/CN113310281A/en
Publication of CN113310281A publication Critical patent/CN113310281A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • F25J1/02—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
    • F25J1/0228—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
    • 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
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/04—Compressor cooling arrangement, e.g. inter- or after-stage cooling or condensate removal
    • 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
    • F25J2240/90—Hot gas waste turbine of an indirect heated gas for power generation

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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)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention provides a liquid air production device utilizing LNG cold energy, which comprises an LNG cold energy power generation unit and a liquid air production unit; the LNG cold energy power generation unit comprises an LNG storage tank, a precooler, a preheater and a natural gas expansion power generation unit which are sequentially connected in series; the liquid air production unit comprises an air compressor, the preheater, the precooler, a gas-liquid separator and a low-temperature storage tank which are sequentially connected in series. The LNG cold energy is transferred to the liquid air to be stored, so that the liquid air is transported to a required place, the utilization of the cold energy is realized, the high efficiency and the flexibility of the utilization of the LNG cold energy are improved, the occupied area is reduced, and the cost is saved.

Description

Liquid air production device utilizing LNG cold energy
Technical Field
The invention relates to the technical field of LNG cold energy utilization, in particular to a liquid air production device utilizing LNG cold energy.
Background
Liquefied Natural Gas (LNG) is natural gas that exists in liquid form at a temperature of about-162 ℃. Generally, LNG is gasified into gaseous natural gas to be transported through a pipeline network for use as a fuel in a power plant, a city gas, a raw material in a chemical plant, etc., and the cold energy released in the gasification of LNG is about 230 kWh/ton.
Currently, the cold energy utilization methods of LNG include air separation, cryogenic pulverization, dry ice manufacture, power generation, and the like. However, when there is no cold energy demand near the LNG receiving station, it becomes difficult to utilize such high grade cold energy because LNG is flammable and explosive and is not suitable for long distance transportation.
In a conventional coastal LNG receiving station, in order to fully utilize the cold energy released by LNG vaporization, an LNG cold energy utilization industry cluster needs to be created based on a comprehensive utilization principle of "temperature-to-mouth and cascade utilization" so that the LNG cold energy can be utilized most efficiently. However, the utilization method requires huge investment and site, and it is difficult to introduce suitable cold energy demand enterprises.
Disclosure of Invention
The invention provides a liquid air production device utilizing LNG cold energy, which is used for solving the defect that the LNG cold energy cannot be efficiently and flexibly utilized in the prior art, realizing the transfer of the LNG cold energy to an intermediate medium, improving the efficiency and flexibility of LNG cold energy utilization, reducing occupied land and saving cost.
The invention provides a liquid air production device utilizing LNG cold energy, which comprises an LNG cold energy power generation unit and a liquid air production unit; wherein the content of the first and second substances,
the LNG cold energy power generation unit comprises an LNG storage tank, a precooler, a preheater and a natural gas expansion power generation unit which are sequentially connected in series;
the liquid air production unit comprises an air compressor, the preheater, the precooler, a gas-liquid separator and a low-temperature storage tank which are sequentially connected in series.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the liquid air production unit further comprises an air purification subunit, the air purification subunit comprises an air filter and a molecular sieve purifier which are sequentially connected in series, and an air outlet of the molecular sieve purifier is connected with an air inlet of the air compressor.
According to the liquid air production device utilizing LNG cold energy provided by the invention, a throttling element is arranged on a connecting pipeline between the air outlet of the precooler and the air inlet of the gas-liquid separator.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the air return port of the gas-liquid separator is sequentially connected with the precooler and the air compressor in series through the air return pipeline.
According to the liquid air production device utilizing the LNG cold energy provided by the invention, the LNG pump is arranged on the connecting pipeline between the low-temperature storage tank and the precooler.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the liquid outlet of the low-temperature storage tank is connected with the liquid outlet pipeline, and the liquid outlet pipeline is provided with the liquid-air pump.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the output end of the natural gas expansion generator set is connected with a power grid through a turbine.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the air compressor is provided with a plurality of stages, and the plurality of stages of air compressors are connected with the preheater in a one-to-one correspondence manner.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the preheater is a shell-and-tube type preheater, a plate-fin type preheater or a packed bed type preheater.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the precooler is a plate-fin type or a wound-tube type precooler.
The liquid air production device utilizing the LNG cold energy provided by the invention is provided with the LNG cold energy power generation unit and the liquid air production unit; the LNG cold energy power generation unit comprises an LNG storage tank, a precooler, a preheater and a natural gas expansion power generation unit which are sequentially connected in series; the liquid air production unit comprises an air compressor, a preheater, a precooler, a gas-liquid separator and a low-temperature storage tank which are sequentially connected in series, LNG cold energy is transferred to liquid air to be stored, the liquid air is transported to a demand place, the cold energy is utilized, the high efficiency and flexibility of the LNG cold energy utilization are improved, the occupied area is reduced, and the cost is saved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic process flow diagram of a liquid air production plant utilizing LNG cold energy according to the present invention;
reference numerals:
1: an air purification sub-unit; 2: an air compressor; 3: a preheater;
4: a precooler; 5: a throttling element; 6: a gas-liquid separator;
7: a low-temperature storage tank; 8: a liquid-air pump; 9: a natural gas expansion generator set;
10: an LNG storage tank; 11: an LNG pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes a liquid air production device using LNG cold energy according to the present invention with reference to fig. 1, including an LNG cold energy power generation unit and a liquid air production unit; wherein the content of the first and second substances,
the LNG cold energy power generation unit comprises an LNG storage tank 10, a precooler 4, a preheater 3 and a natural gas expansion power generation unit 9 which are sequentially connected in series;
the liquid air production unit comprises an air compressor 2, a preheater 3, a precooler 4, a gas-liquid separator 6 and a low-temperature storage tank 7 which are sequentially connected in series. It is understood that the LNG cold energy power generation unit is used to generate electricity using natural gas gasified after releasing cold energy. The liquid air production unit is used for absorbing LNG cold energy through air and converting the LNG cold energy into liquid air, and storing, transporting and using the cold energy is carried out.
The LNG cold energy power generation unit comprises an LNG storage tank 10, a precooler 4, a preheater 3 and a natural gas expansion power generation unit 9 which are sequentially connected in series, liquefied natural gas in the LNG storage tank 10 is conveyed into the precooler 4 to be gasified through cooling and heat absorption, then the gasified natural gas is conveyed into the preheater 3 to be cooled and heat absorbed again, and finally conveyed to the natural gas expansion power generation unit 9 to generate power.
Further, the liquid air production unit comprises an air compressor 2, a preheater 3, a precooler 4, a gas-liquid separator 6 and a low-temperature storage tank 7 which are sequentially connected in series, normal-temperature and normal-pressure air is compressed by the air compressor 2 and then is conveyed to the preheater 3, the preheater 3 recovers and utilizes compression heat, normal-temperature and high-pressure air is conveyed to the precooler 4 and exchanges heat with LNG, cold absorption and heat release are carried out for liquefaction, the liquefied air is conveyed to the gas-liquid separator 6 for gas-liquid separation, and the separated liquid air is conveyed to the low-temperature storage tank 7 for storage.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the liquid air production unit further comprises an air purification subunit 1, the air purification subunit 1 comprises an air filter and a molecular sieve purifier which are sequentially connected in series, and an air outlet of the molecular sieve purifier is connected with an air inlet of the air compressor 2. It can be understood that the liquid air production unit further comprises an air purification subunit 1, and along the flow direction of the air at normal temperature and normal pressure, the air purification subunit 1 comprises an air filter and a molecular sieve purifier which are sequentially connected in series, wherein the air filter is used for filtering dust in the air, and the molecular sieve purifier is used for removing moisture, carbon dioxide and acetylene impurities in the air. The air outlet of the molecular sieve purifier is connected with the air inlet of the air compressor 2, so that the air at normal temperature and normal pressure is purified and then conveyed to the air compressor 2.
According to the liquid air production device utilizing LNG cold energy provided by the invention, a throttling element 5 is arranged on a connecting pipeline between an air outlet of the precooler 4 and an air inlet of the gas-liquid separator 6. It is understood that the throttling element 5 is used for throttling, depressurizing and expanding the air flowing out of the precooler 4 to generate gas-liquid two-phase air, and the gas-liquid two-phase air enters the gas-liquid separator 6 from the air inlet of the gas-liquid separator 6.
It is worth mentioning that the throttling element 5 may be a cryogenic expander or a throttle valve.
According to the liquid air production device utilizing the LNG cold energy, the return air port of the gas-liquid separator 6 is sequentially connected with the precooler 4 and the air compressor 2 in series through the return air pipeline. It can be understood that the gas-phase air separated by the gas-liquid separator 6 flows back to the precooler 4 through the gas return pipeline through the gas return port, releases the cold energy and then delivers the cold energy to the air compressor 2.
According to the liquid air production device utilizing the LNG cold energy provided by the invention, the LNG pump 11 is arranged on the connecting pipeline between the low-temperature storage tank 7 and the precooler 4. It will be appreciated that the LNG pump 11 is used to power the LNG flow in the cryogenic storage tank 7 to the precooler 4.
It is worth mentioning that the liquid-air storage tank can adopt a dewar tank or a low-temperature liquid storage tank.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the liquid outlet of the low-temperature storage tank 7 is connected with the liquid outlet pipeline, and the liquid outlet pipeline is provided with the liquid-air pump 8. It can be understood that the liquid outlet of the low-temperature storage tank 7 is connected with a liquid outlet pipeline for conveying liquid air for storing cold energy to a cold energy user side or a liquid air transport vehicle for a remote user to use the cold energy. And the liquid-air pump 8 is arranged on the liquid outlet pipeline and provides power for the flow of liquid air in the low-temperature storage tank 7.
It is to be noted that the LNG pump 11 and the liquid air pump 8 may be piston type or centrifugal type pumps.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the output end of a natural gas expansion generator set 9 is connected with a power grid through a turbine. It can be understood that the natural gas expansion generator set 9 drives the turbine to rotate to do work and generate power and is connected to the grid.
It should be noted that the natural gas expansion generator set 9 may be radial flow type, axial flow type or radial axial flow type, the natural gas expansion generator set 9 includes one or more turbines, and the turbines are connected in series, in parallel or integrated into a turbine set, and the turbine set is coaxially connected with the generator.
According to the liquid air production device utilizing LNG cold energy, the air compressors 2 are arranged in multiple stages, and the multistage air compressors 2 are connected with the preheaters 3 in a one-to-one correspondence mode. It will be appreciated that the air compressor 2 may alternatively be of a piston, screw or centrifugal type construction. The multi-stage air compressors 2 are connected in series or in parallel or are integrated into a compressor set, and the preheaters 3 are arranged on each stage of the air compressor 2 in a one-to-one correspondence manner.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the preheater 3 is a shell-and-tube type preheater 3, a plate-fin type preheater or a packed bed type preheater 3. It is understood that the preheater 3 may be one or a combination of shell and tube, plate fin or packed bed preheaters 3.
According to the liquid air production device utilizing LNG cold energy provided by the invention, the precooler 4 is a plate-fin or wound-tube precooler 4. It is understood that the precooler 4 can be a plate-fin type precooler 4 or a tube-wound type precooler 4, can be arranged in one stage or multiple stages, and can be connected in series or in parallel or in a corresponding combination manner.
The process flow of the liquid air production device utilizing LNG cold energy provided by the embodiment of the invention is as follows:
the LNG cold energy power generation unit is characterized in that LNG from an LNG storage tank 10 is pressurized to 7MPa by a pump and then enters a precooler 4 to be reheated and gasified to normal temperature, cold energy is transferred to compressed air, then normal-temperature natural gas enters a preheater 3 and is heated to 140 ℃ by compression heat carried by the compressed air, and finally enters a natural gas expansion power generation unit 9 to drive a turbine to rotate to do work for power generation and grid connection, and the natural gas expanded to 3MPa enters a natural gas pipe network and is conveyed to a user area;
the liquid air production unit is characterized in that normal-temperature and normal-pressure air is purified by the air purification subunit 1, then compressed to 150 ℃ and 7MPa by the air compressor 2 group, compression heat is recycled by the preheater 3, then the high-pressure air cooled to the normal temperature enters the precooler 4 to be reduced to minus 174 ℃, is throttled by the throttling element 5 to be decompressed and expanded to minus 194 ℃, gas-liquid two-phase air is generated and then enters the gas-liquid separator 6, the gas-phase air flows back to the precooler 4 to provide cold energy and then flows into the inlet of the air compressor 2, and the gas-liquid two-phase air and clean air purified by the air purification subunit 1 are pressurized by the air compressor 2 again; liquid air is stored in a liquid air storage tank and is conveyed to a liquid outlet pipeline leading to a cold energy user side or a liquid air transport vehicle through a liquid air pump 8 so as to be used by a remote user for high-grade cold energy.
The liquid air production device utilizing the LNG cold energy provided by the invention is provided with the LNG cold energy power generation unit and the liquid air production unit; the LNG cold energy power generation unit comprises an LNG storage tank, a precooler, a preheater and a natural gas expansion power generation unit which are sequentially connected in series; the liquid air production unit includes air compressor, pre-heater, precooler, vapour and liquid separator and the low temperature storage tank of establishing ties in proper order, realizes shifting the LNG cold energy to liquid air and saves, and then with liquid air transportation demand ground, realizes the utilization to the cold energy, improves high efficiency and the flexibility that the LNG cold energy utilized, reduces to take up an area of, practices thrift the cost.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A liquid air production device utilizing LNG cold energy is characterized by comprising an LNG cold energy power generation unit and a liquid air production unit; wherein the content of the first and second substances,
the LNG cold energy power generation unit comprises an LNG storage tank, a precooler, a preheater and a natural gas expansion power generation unit which are sequentially connected in series;
the liquid air production unit comprises an air compressor, the preheater, the precooler, a gas-liquid separator and a low-temperature storage tank which are sequentially connected in series.
2. The LNG cold energy utilization liquid air production device of claim 1, further comprising an air purification sub-unit, wherein the air purification sub-unit comprises an air filter and a molecular sieve purifier connected in series in sequence, and an air outlet of the molecular sieve purifier is connected with an air inlet of the air compressor.
3. The LNG cold energy utilizing liquid air producing apparatus according to claim 1, wherein a throttling element is provided on a connection pipe between the air outlet of the precooler and the air inlet of the gas-liquid separator.
4. A liquid air producing apparatus using LNG cold energy according to claim 1, wherein the return port of the gas-liquid separator is connected in series with the precooler and the air compressor in this order through a return line.
5. The liquefied air production apparatus using cold energy of LNG according to claim 1, wherein an LNG pump is provided on a connection pipe between the cryogenic storage tank and the precooler.
6. The LNG cold energy utilizing liquid air production device according to claim 1, wherein a liquid outlet of the cryogenic storage tank is connected to a liquid outlet pipeline, and a liquid-air pump is disposed on the liquid outlet pipeline.
7. The LNG cold energy utilizing liquid air production plant of claim 1, wherein the output of the natural gas expansion power plant is connected to the power grid through a turbine.
8. A liquid air production plant using LNG cold energy according to any one of claims 1-7, characterized in that the air compressors are provided in multiple stages, and the air compressors of the multiple stages are connected to the preheater in a one-to-one correspondence.
9. A liquid air production plant using LNG cold energy according to any of the claims 1-7, characterized in that the preheater is a shell and tube, plate fin or packed bed preheater.
10. A liquid air production plant using LNG cold energy according to any one of claims 1-7, characterized in that the precooler is a plate-fin or a tube-wound precooler.
CN202110662769.XA 2021-06-15 2021-06-15 Liquid air production device utilizing LNG cold energy Pending CN113310281A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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