CN112344652A - Nitrogen liquefaction system for parallel production power generation and application method thereof - Google Patents

Nitrogen liquefaction system for parallel production power generation and application method thereof Download PDF

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Publication number
CN112344652A
CN112344652A CN202011267729.7A CN202011267729A CN112344652A CN 112344652 A CN112344652 A CN 112344652A CN 202011267729 A CN202011267729 A CN 202011267729A CN 112344652 A CN112344652 A CN 112344652A
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China
Prior art keywords
nitrogen
liquid
compressor
heat exchanger
liquid nitrogen
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Pending
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CN202011267729.7A
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Chinese (zh)
Inventor
王仁保
金志�
王海跃
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Zhejiang Haichang Gas Co ltd
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Zhejiang Haichang Gas Co ltd
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Priority to CN202011267729.7A priority Critical patent/CN112344652A/en
Publication of CN112344652A publication Critical patent/CN112344652A/en
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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
    • F25J1/02—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
    • F25J1/0237—Heat exchange integration integrating refrigeration provided for liquefaction and purification/treatment of the gas to be liquefied, e.g. heavy hydrocarbon removal from natural gas
    • F25J1/0239—Purification or treatment step being integrated between two refrigeration cycles of a refrigeration cascade, i.e. first cycle providing feed gas cooling and second cycle providing overhead gas cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • 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"
    • F25J1/0042—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 liquid 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
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    • 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
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    • 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
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    • 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
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    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0234—Integration with a cryogenic air separation unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • 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
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    • 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
    • F25J1/0244—Operation; Control and regulation; Instrumentation
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    • 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
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    • 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
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/0423—Subcooling of liquid process streams
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    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04351—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
    • F25J3/04357—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen and comprising a gas work expansion 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04387—Details relating to the work expansion, e.g. process parameter etc. using liquid or hydraulic turbine expansion
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    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
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    • 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
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    • 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
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    • F25J2210/42—Nitrogen
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    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/02—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream
    • F25J2240/12—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream the fluid being nitrogen
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    • 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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    • 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/34—Details about subcooling of liquids

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The invention discloses a nitrogen liquefaction system for parallel production power generation and a using method thereof, and the system comprises a raw material nitrogen compressor, a main heat exchanger and a liquid nitrogen subcooler, wherein the output end of the raw material nitrogen compressor is connected with a circulating nitrogen compressor through a pipeline, the output end of the circulating nitrogen compressor is sequentially connected with a high-temperature expansion machine supercharger and a low-temperature expansion machine supercharger through pipelines, one end of the liquid nitrogen subcooler is connected with a gas-liquid separator through a pipeline, the output end of the gas-liquid separator is connected with a liquid expansion machine, the left end of the liquid expansion machine is provided with a generator, and the lower end of the liquid expansion machine is connected with a product liquid nitrogen storage tank through a. According to the nitrogen liquefaction system with parallel production power generation and the using method, the refrigeration efficiency of the device is integrally improved by arranging the liquid expansion machine, the production energy is effectively increased, meanwhile, the liquid expansion machine provides kinetic energy to drive the generator to generate power, and the power is newly used for production power utilization.

Description

Nitrogen liquefaction system for parallel production power generation and application method thereof
Technical Field
The invention relates to the technical field of nitrogen liquefaction, in particular to a nitrogen liquefaction system for co-production power generation and a using method thereof.
Background
The nitrogen liquefaction process in the current market is that low-pressure nitrogen is compressed by a raw material nitrogen compressor, the compressed nitrogen is converged with return gas of a liquefaction device, the compressed nitrogen is divided into two parts after being compressed by a circulating nitrogen compressor, one part of the compressed nitrogen enters a main heat exchanger to be cooled and then is introduced into a high-temperature expansion machine, and the expanded nitrogen is reheated by the main heat exchanger, is discharged out of a cold box and returns to the inlet position of the circulating nitrogen compressor; the other part enters a main heat exchanger after being pressurized by a high-temperature expander and a pressurizing end of a low-temperature expander, is divided into two parts after being cooled, one part is introduced into the low-temperature expander, is reheated by the main heat exchanger after being expanded, and then is discharged out of a cold box and returns to the inlet position of the circulating nitrogen compressor, and the other part is continuously cooled until liquid nitrogen enters a gas-liquid separator after being cooled by a throttling flow; liquid nitrogen pumped by the gas-liquid separator is subcooled in a liquid nitrogen subcooler, throttled and taken as product liquid nitrogen, and enters a product liquid nitrogen storage tank; the problem to be solved at present is how to design a nitrogen liquefaction system with parallel production power and a use method, wherein the nitrogen liquefaction system has good stability, has high refrigeration efficiency through a liquid expansion machine and saves the compression energy consumption of the compressor, and the refrigeration efficiency is low through a throttle valve and the compression energy consumption of the compressor is wasted.
Disclosure of Invention
The invention aims to provide a nitrogen liquefaction system for parallel production power generation and a using method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a parallelly produced nitrogen liquefaction system and application method who generates electricity, includes raw materials nitrogen compressor, main heat exchanger and liquid nitrogen subcooler, the input of raw materials nitrogen compressor is provided with the input port of first nitrogen gas, the output of raw materials nitrogen compressor has the circulating nitrogen compressor through the pipe connection, the output of circulating nitrogen compressor has connected gradually high temperature expander booster compressor and low temperature expander booster compressor through the pipeline to the other end interconnects with the input end of high temperature expander, the pipeline that circulating nitrogen compressor and high temperature expander booster compressor are connected is inside to be filled with third nitrogen gas, the low temperature expander is installed to the right-hand member of low temperature expander booster compressor, the high temperature expander is installed to the right-hand member of high temperature expander booster compressor, the output of low temperature expander booster compressor has the liquid nitrogen subcooler through the pipe connection, the outside one end of liquid nitrogen subcooler is provided with the business turn over pipeline of second liquid nitrogen, the utility model discloses a circulating nitrogen compressor, including liquid nitrogen subcooler, product liquid nitrogen storage tank, main heat exchanger, liquid nitrogen subcooler's one end has gas liquid separator through the pipe connection, gas liquid separator's output is connected with liquid expansion machine, the generator is installed to liquid expansion machine's left end, liquid expansion machine's lower extreme has the product liquid nitrogen storage tank through the pipe connection, main heat exchanger's inside runs through to be provided with respectively in main heat exchanger and follows empty nitrogen gas, from empty dirty ammonia that divides, from empty oxygen and the input port that comes from empty pressure nitrogen that divides, main heat exchanger's inside runs through the delivery outlet that is provided with air behind the heat transfer in main heat exchanger, low temperature expansion machine.
Preferably, the input ends of the low-temperature expander, the high-temperature expander and the product liquid nitrogen storage tank are all provided with control valves, and the control valves are provided with pressure gauges.
Preferably, the output ends of the raw material nitrogen compressor, the circulating nitrogen compressor, the high-temperature expander supercharger, the liquid nitrogen subcooler and the gas-liquid separator are all provided with control valves.
Preferably, the output end, the input end and the pipeline joint of the raw material nitrogen compressor, the circulating nitrogen compressor, the low-temperature expander supercharger, the high-temperature expander supercharger, the liquid nitrogen subcooler, the gas-liquid separator and the product liquid nitrogen storage tank are sealed.
The invention also provides a use method of the columnar sampling device capable of accurately guiding river and lake sediments, which comprises the following steps:
when the first nitrogen is compressed by a raw material nitrogen compressor, the compressed first nitrogen is converged with a second nitrogen of a liquefying device, the compressed first nitrogen is divided into two parts after being compressed by a circulating nitrogen compressor, one part of the first nitrogen enters a main heat exchanger and is introduced into a high-temperature expander, the expanded first nitrogen is reheated by the main heat exchanger and is discharged from a cold box and returns to the inlet position of the circulating nitrogen compressor, the other part of the first nitrogen enters the main heat exchanger after being pressurized by a low-temperature expander supercharger and a high-temperature expander, the cooled first nitrogen is divided into two parts, one part of the first nitrogen is introduced into the low-temperature expander, the expanded first nitrogen is reheated by the main heat exchanger and is discharged from the cold box and returns to the inlet position of the circulating nitrogen compressor, the other part of the first nitrogen is continuously cooled until liquid nitrogen is pumped out and enters a liquid expander, the liquid-gas separator after being expanded, and.
Compared with the prior art, the invention has the beneficial effects that: according to the nitrogen liquefaction system with parallel production power generation and the using method thereof, the refrigeration efficiency of the device is integrally improved through the arranged liquid expansion machine, the production energy is effectively increased, meanwhile, the liquid expansion machine provides kinetic energy to drive the generator to generate power, and the power is newly used for production power utilization.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. a first nitrogen gas; 2. a raw material nitrogen compressor; 3. a second nitrogen gas; 4. a recycle nitrogen compressor; 5. a third nitrogen gas; 6. a supercharger of a low-temperature expansion machine; 7. a supercharger of a high-temperature expander; 8. a low temperature expander; 9. a high temperature expander; 10. a primary heat exchanger; 11. air after heat exchange; 12. a first liquid nitrogen; 13. A liquid nitrogen subcooler; 14. a second liquid nitrogen; 15. a gas-liquid separator; 16. nitrogen from air separation; 17. ammonia from air separation; 18. oxygen from air separation; 19. from air separation pressure nitrogen; 20. a liquid expander; 21. A generator; 22. and a product liquid nitrogen storage tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, an embodiment of the present invention: a nitrogen liquefaction system for parallel production power generation and a using method thereof comprise a raw material nitrogen compressor 2, a main heat exchanger 10 and a liquid nitrogen subcooler 13, wherein an input port of first nitrogen 1 is arranged at an input end of the raw material nitrogen compressor 2, the first nitrogen 1 is low-pressure nitrogen from air separation, an output end of the raw material nitrogen compressor 2 is connected with a circulating nitrogen compressor 4 through a pipeline, an output end of the circulating nitrogen compressor 4 is sequentially connected with a high-temperature expander supercharger 7 and a low-temperature expander supercharger 6 through a pipeline, the other end of the circulating nitrogen compressor 4 is connected with an input end of a high-temperature expander 9, a pipeline connecting the circulating nitrogen compressor 4 and the high-temperature expander supercharger 7 is filled with third nitrogen 5, the third nitrogen 5 is nitrogen after being compressed by the circulating nitrogen compressor 4, the low-temperature expander 8 is installed at the right end of the low-temperature expander 6, and the high-temperature expander 9 is installed at, the output end of the booster 6 of the cryogenic expansion machine is connected with a liquid nitrogen subcooler 13 through a pipeline, one end of the outside of the liquid nitrogen subcooler 13 is provided with an inlet and outlet pipeline of second liquid nitrogen 14, the second liquid nitrogen 14 goes to a lower tower, one end of the liquid nitrogen subcooler 13 is connected with a gas-liquid separator 15 through a pipeline, the output end of the gas-liquid separator 15 is connected with a liquid expansion machine 20, the left end of the liquid expansion machine 20 is provided with a generator 21, the lower end of the liquid expansion machine 20 is connected with a product liquid nitrogen storage tank 22 through a pipeline, the inside of the main heat exchanger 10 penetrates through the main heat exchanger 10 and is respectively provided with an inlet for air separation nitrogen 16, air separation waste ammonia 17, air separation oxygen 18 and air separation pressure nitrogen 19, the air separation nitrogen 16, the air separation waste ammonia 17, the air separation oxygen 18 and the air separation pressure nitrogen 19 all go to the main heat exchanger 10, the inside of, the lower extreme of low temperature expander 8 is connected with liquid nitrogen and deposits the jar, and the inside packing that the jar was deposited to liquid nitrogen has first liquid nitrogen 12, and first liquid nitrogen 12 goes to the tower, and the upper end that the jar was deposited to liquid nitrogen is provided with the pipeline of second nitrogen 3 to 3 refluxes of second nitrogen to the input of circulating nitrogen compressor 4, and second nitrogen 3 is the inflation nitrogen gas that flows backwards.
Further, the input ends of the low-temperature expander 8, the high-temperature expander 9 and the product liquid nitrogen storage tank 22 are all provided with control valves, and pressure gauges are installed on the control valves.
Further, the output ends of the raw material nitrogen compressor 2, the circulating nitrogen compressor 4, the high temperature expander supercharger 7, the liquid nitrogen subcooler 13 and the gas-liquid separator 15 are all provided with control valves.
Further, the output end, the input end and the pipeline connection of the raw material nitrogen compressor 2, the circulating nitrogen compressor 4, the low temperature expander supercharger 6, the high temperature expander supercharger 7, the liquid nitrogen subcooler 13, the gas-liquid separator 15 and the product liquid nitrogen storage tank 22 are all sealed.
The invention also provides a use method of the columnar sampling device capable of accurately guiding river and lake sediments, which comprises the following steps:
when the first nitrogen gas 1 is compressed by a raw material nitrogen compressor 2, is merged with the second nitrogen gas 3 of a liquefying device after being compressed by a circulating nitrogen compressor 4, is divided into two parts, one part enters a main heat exchanger 10 for cooling and then is introduced into a high-temperature expander 9, is reheated by the main heat exchanger 10 after being expanded and returns to the inlet position of the circulating nitrogen compressor 4, the other part enters the main heat exchanger 10 after being pressurized by a low-temperature expander supercharger 6 and a high-temperature expander supercharger 7, is divided into two parts after being cooled, one part is introduced into a low-temperature expander 8, is reheated by the main heat exchanger 10 after being expanded and returns to the inlet position of the circulating nitrogen compressor 4, the other part is continuously cooled until liquid nitrogen is extracted and enters a liquid expander 20 after being expanded, enters a gas-liquid separator 15, and is subcooled in a liquid nitrogen subcooler 13 through the gas-liquid separator 15 and then is throttled to be used as a product liquid nitrogen, into product liquid nitrogen storage 22.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (5)

1. The utility model provides a nitrogen gas liquefaction system of parallelly connected product electricity generation, includes raw materials nitrogen compressor (2), main heat exchanger (10) and liquid nitrogen subcooler (13), its characterized in that: the input of raw materials nitrogen compressor (2) is provided with the input port of first nitrogen gas (1), there is circulating nitrogen compressor (4) the output of raw materials nitrogen compressor (2) through the pipe connection, the output of circulating nitrogen compressor (4) has connected gradually high temperature expander booster compressor (7) and low temperature expander booster compressor (6) through the pipeline to the input interconnect of the other end and high temperature expander (9), the pipeline that circulating nitrogen compressor (4) and high temperature expander booster compressor (7) are connected is inside to be filled with third nitrogen gas (5), low temperature expander (8) are installed to the right-hand member of low temperature expander booster compressor (6), high temperature expander (9) are installed to the right-hand member of high temperature expander booster compressor (7), the output of low temperature expander booster compressor (6) has liquid nitrogen subcooler (13) through the pipe connection, the utility model discloses a heat exchanger, including liquid nitrogen subcooler (13), the outside one end of liquid nitrogen subcooler (13) is provided with the business turn over pipeline of second liquid nitrogen (14), the one end of liquid nitrogen subcooler (13) has vapour and liquid separator (15) through the pipe connection, the output of vapour and liquid separator (15) is connected with liquid expander (20), generator (21) are installed to the left end of liquid expander (20), the lower extreme of liquid expander (20) has product liquid nitrogen storage tank (22) through the pipe connection, the inside of main heat exchanger (10) is run through and is provided with respectively in main heat exchanger (10) and is come from empty nitrogen gas (16), come from empty dirty ammonia (17), come from empty oxygen (18) and come from the input port of empty pressure nitrogen (19) that divides, the inside of main heat exchanger (10) is run through and is provided with the delivery outlet of heat transfer back air (11) in main heat exchanger (10), the inside packing of jar is deposited to liquid nitrogen has first liquid nitrogen (12), the upper end of jar is deposited to liquid nitrogen is provided with the pipeline of second nitrogen gas (3) to second nitrogen gas (3) flow back to the input of circulating nitrogen compressor (4).
2. The nitrogen liquefaction system with cogeneration of claim 1, wherein: the input ends of the low-temperature expander (8), the high-temperature expander (9) and the product liquid nitrogen storage tank (22) are all provided with control valves, and pressure gauges are installed on the control valves.
3. The nitrogen liquefaction system with cogeneration of claim 1, wherein: and the output ends of the raw material nitrogen compressor (2), the circulating nitrogen compressor (4), the high-temperature expander supercharger (7), the liquid nitrogen subcooler (13) and the gas-liquid separator (15) are all provided with control valves.
4. The nitrogen liquefaction system with cogeneration of claim 1, wherein: the output end, the input end and the pipeline joint of the raw material nitrogen compressor (2), the circulating nitrogen compressor (4), the low-temperature expander supercharger (6), the high-temperature expander supercharger (7), the liquid nitrogen subcooler (13), the gas-liquid separator (15) and the product liquid nitrogen storage tank (22) are all sealed.
5. The nitrogen liquefaction system with cogeneration of claim 1, further comprising a method of use, the method comprising the steps of:
when the first nitrogen (1) is compressed by a raw material nitrogen compressor (2), is merged with the second nitrogen (3) of a liquefying device after being compressed, is divided into two parts after being compressed by a circulating nitrogen compressor (4), one part enters a main heat exchanger (10) to be cooled and then is introduced into a high-temperature expansion machine (9), is reheated by the main heat exchanger (10) after being expanded and then is discharged from a cold box, and is returned to the inlet position of the circulating nitrogen compressor (4), the other part enters the main heat exchanger (10) after being pressurized by a low-temperature expansion machine booster (6) and a high-temperature expansion machine (7), is divided into two parts after being cooled, one part is introduced into the low-temperature expansion machine (8), is reheated by the main heat exchanger (10) after being expanded and is discharged from the cold box, and is returned to the inlet position of the circulating nitrogen compressor (4), the other part is continuously cooled until liquid nitrogen is pumped out to enter a liquid expansion machine, the liquid nitrogen pumped out by the gas-liquid separator (15) is supercooled in a liquid nitrogen supercooler (13), and is throttled to be taken as product liquid nitrogen which enters a product liquid nitrogen storage tank (22).
CN202011267729.7A 2020-11-13 2020-11-13 Nitrogen liquefaction system for parallel production power generation and application method thereof Pending CN112344652A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115751838A (en) * 2022-11-02 2023-03-07 广东粤豫科技有限公司 Energy-saving liquefaction system and energy-saving nitrogen liquefier device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115751838A (en) * 2022-11-02 2023-03-07 广东粤豫科技有限公司 Energy-saving liquefaction system and energy-saving nitrogen liquefier device
CN115751838B (en) * 2022-11-02 2024-01-02 广东粤豫科技有限公司 Energy-saving external liquefaction system and energy-saving nitrogen and oxygen external liquefier device

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