CN216814804U - Matching with liquefying device for oxygen and nitrogen for electrolytic hydrogen production - Google Patents

Matching with liquefying device for oxygen and nitrogen for electrolytic hydrogen production Download PDF

Info

Publication number
CN216814804U
CN216814804U CN202123376593.6U CN202123376593U CN216814804U CN 216814804 U CN216814804 U CN 216814804U CN 202123376593 U CN202123376593 U CN 202123376593U CN 216814804 U CN216814804 U CN 216814804U
Authority
CN
China
Prior art keywords
heat exchanger
nitrogen
oxygen
precooling
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202123376593.6U
Other languages
Chinese (zh)
Inventor
刘庆洋
沈海涛
魏凯
陈甲楠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Guofu Hydrogen Energy Technology Equipment Co Ltd
Zhangjiagang Hydrogen Cloud New Energy Research Institute Co Ltd
Original Assignee
Jiangsu Guofu Hydrogen Energy Technology Equipment Co Ltd
Zhangjiagang Hydrogen Cloud New Energy Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Guofu Hydrogen Energy Technology Equipment Co Ltd, Zhangjiagang Hydrogen Cloud New Energy Research Institute Co Ltd filed Critical Jiangsu Guofu Hydrogen Energy Technology Equipment Co Ltd
Priority to CN202123376593.6U priority Critical patent/CN216814804U/en
Application granted granted Critical
Publication of CN216814804U publication Critical patent/CN216814804U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • F25J1/0002—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
    • F25J1/0017—Oxygen
    • 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
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/005—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by expansion of a gaseous refrigerant stream 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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/007—Primary atmospheric gases, mixtures thereof
    • F25J1/0072—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
    • F25J1/0201—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 only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—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 only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal 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
    • F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
    • F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
    • 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
    • F25J1/0236—Heat exchange integration providing refrigeration for different processes treating not the same feed 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
    • F25J1/0243—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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/86—Processes or apparatus using other separation and/or other processing means using electrical phenomena, e.g. Corona discharge, electrolysis or magnetic field
    • 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
    • F25J2240/60—Expansion by ejector or injector, e.g. "Gasstrahlpumpe", "venturi mixing", "jet pumps"
    • 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
    • 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
    • F25J2270/14—External refrigeration with work-producing gas expansion loop
    • F25J2270/16—External refrigeration with work-producing gas expansion loop with mutliple gas expansion loops of the same refrigerant

Landscapes

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

Abstract

The utility model discloses a liquefying device matched with oxygen and nitrogen for hydrogen production by electrolysis, which comprises: the system comprises a compressor, a primary and a secondary booster turboexpanders, a first precooling heat exchanger, a second precooling heat exchanger and a liquefying heat exchanger, wherein the first precooling heat exchanger, the second precooling heat exchanger and the liquefying heat exchanger are provided with an oxygen channel, a refrigerant channel and a nitrogen channel, all the oxygen channels, all the refrigerant channels and all the nitrogen channels in the first precooling heat exchanger, the second precooling heat exchanger and the liquefying heat exchanger are communicated in sequence respectively, and the first precooling heat exchanger and the liquefying heat exchanger are also provided with refrigerant precooling channels. The utility model has the advantages that: the liquid nitrogen circulating refrigeration is utilized to liquefy the nitrogen and the oxygen, so that the hydrogen production system by the electrolyzed water can provide liquid hydrogen products and liquid oxygen products, and simultaneously, the liquid nitrogen is provided for a hydrogen pre-cooling unit in the hydrogen production system by the electrolyzed water as a refrigerant for hydrogen pre-cooling, and the whole liquefying device for the oxygen and the nitrogen has the advantages of simple structure, low power consumption and full energy utilization.

Description

Matching with liquefying device for oxygen and nitrogen for electrolytic hydrogen production
Technical Field
The utility model relates to the technical field of a hydrogen production system by electrolyzing water.
Background
A system for producing hydrogen by electrolyzing water, generally comprising: raw material water purification unit, water electrolysis unit, hydrogen purification unit, hydrogen compression unit, hydrogen precooling unit, inflation liquefaction unit. At present, oxygen generated by a water electrolysis hydrogen production system is generally directly discharged, which causes energy waste. In order to improve the efficiency of hydrogen production and to collect the oxygen in the hydrogen production process, the applicant has developed a novel system for producing hydrogen by electrolysis of water, which produces liquid hydrogen and liquid oxygen. For this reason, the applicant has developed an oxygen liquefaction device that fits in an electrolytic water hydrogen production system.
SUMMERY OF THE UTILITY MODEL
The technical problems to be solved by the utility model are as follows: provides a liquefying device matched with oxygen and nitrogen for producing hydrogen by electrolysis.
In order to solve the problems, the utility model adopts the technical scheme that: the liquefying device matched with oxygen and nitrogen for producing hydrogen by electrolysis comprises: the system comprises a compressor, a booster turboexpander and a heat exchanger, wherein the booster turboexpander comprises a primary booster turboexpander and a secondary booster turboexpander, the heat exchanger comprises a first precooling heat exchanger, a second precooling heat exchanger and a liquefying heat exchanger which are provided with an oxygen channel, a refrigerant channel and a nitrogen channel, all the oxygen channels, all the refrigerant channels and all the nitrogen channels in the first precooling heat exchanger, the second precooling heat exchanger and the liquefying heat exchanger are communicated in sequence respectively, and the first precooling heat exchanger and the liquefying heat exchanger are also provided with refrigerant precooling channels; the input end and the output end of the compressor are respectively provided with a nitrogen input pipe and a compressor output pipe, the compressor output pipe is connected with a circulating refrigeration conveying pipe and a liquefaction conveying pipe with a flow regulating valve, the circulating refrigeration conveying pipe is connected to the supercharging end of a two-stage supercharging turboexpander, the outlet of the supercharging end of the two-stage supercharging turboexpander is communicated with the supercharging end of a one-stage supercharging turboexpander, the outlet of the supercharging end of the one-stage supercharging turboexpander is communicated with the inlet of a refrigerant precooling channel of a first precooling heat exchanger, the outlet of the refrigerant precooling channel of the first precooling heat exchanger is communicated with the expansion end of the one-stage supercharging turboexpander, the outlet of the expansion end of the one-stage supercharging turboexpander is communicated with the inlet of the refrigerant precooling channel of the liquefaction heat exchanger, the outlet of the refrigerant precooling channel of the liquefaction heat exchanger is communicated with the expansion end of the two-stage supercharging turboexpander, and the outlet of the expansion end of the two-stage supercharging turboexpander is connected to the liquefaction heat exchanger through a two-stage expansion output pipe The outlet of the refrigerant channel of the first precooling heat exchanger is connected to the nitrogen input pipe through a reflux conveying pipe; the inlet of a nitrogen channel of the first precooling heat exchanger is connected with the liquefaction conveying pipe, and the outlet of the nitrogen channel of the liquefaction heat exchanger is connected with a liquid nitrogen output pipe; the inlet of the oxygen channel of the first precooling heat exchanger is connected with an input pipe of oxygen to be liquefied, and the outlet of the oxygen channel of the liquefying heat exchanger is connected with a liquid oxygen output pipe with a liquid oxygen flow pressure regulating valve.
Further, the above-mentioned liquefying plant matched with oxygen and nitrogen for hydrogen production by electrolysis, wherein a liquid nitrogen output pipe is connected to a gas-liquid separation tank, and the gas-liquid separation tank is provided with a gas-liquid separation tank output pipe with a liquid nitrogen level control valve.
Further, the above-mentioned matching is in the liquefying plant of oxygen and nitrogen of electrolytic hydrogen production, wherein, the top of gas-liquid separation jar is provided with the gas output pipe, gas output pipe connect to second grade expansion output pipe.
Further, the liquefaction device matched with the oxygen and nitrogen for hydrogen production by electrolysis is provided with a flowmeter on the liquefaction conveying pipe.
Further, the above-mentioned liquefying plant for oxygen and nitrogen matched with electrolytic hydrogen production is provided, wherein a first cooler is provided on the output pipe of the compressor, a second cooler is provided between the outlet of the supercharging end of the secondary supercharging turboexpander and the supercharging end of the primary supercharging turboexpander, and a third cooler is provided between the outlet of the supercharging end of the primary supercharging turboexpander and the inlet of the refrigerant precooling channel of the first precooling heat exchanger.
Further, the device is matched with a liquefying device for oxygen and nitrogen for hydrogen production by electrolysis, wherein a liquid level meter is arranged on the gas-liquid separation tank.
The utility model has the advantages that: the liquid nitrogen circulating refrigeration is utilized to liquefy the nitrogen and the oxygen, so that the hydrogen production system by the electrolyzed water can provide liquid hydrogen products and liquid oxygen products, and simultaneously, the liquid nitrogen is provided for a hydrogen pre-cooling unit in the hydrogen production system by the electrolyzed water as a refrigerant for hydrogen pre-cooling, and the whole liquefying device for the oxygen and the nitrogen has the advantages of simple structure, low power consumption and full energy utilization.
Drawings
FIG. 1 is a schematic process flow diagram of an oxygen and nitrogen liquefaction device for hydrogen production by electrolysis according to the present invention.
Detailed Description
The liquefaction device of oxygen and nitrogen matched with electrolytic hydrogen production according to the present invention will be described in further detail with reference to preferred embodiments.
As shown in fig. 1, the oxygen and nitrogen liquefying apparatus for hydrogen production by electrolysis comprises: compressor 1, booster turbo expander, heat exchanger. The turbo expander includes a first stage turbo expander 2 and a second stage turbo expander 3. The heat exchangers comprise a first pre-cooling heat exchanger 7, a second pre-cooling heat exchanger 8 and a liquefaction heat exchanger 9.
A first oxygen passage 71, a first refrigerant passage 72, a first nitrogen passage 73, and a first refrigerant pre-cooling passage 74 are provided in the first pre-cooling heat exchanger 7. A second oxygen channel 81, a second refrigerant channel 82 and a second nitrogen channel 83 are arranged in the second pre-cooling heat exchanger 8, and a third oxygen channel 91, a third refrigerant channel 92, a third nitrogen channel 93 and a third refrigerant pre-cooling channel 94 are arranged in the liquefying heat exchanger 9. The first oxygen passage 71, the second oxygen passage 81, and the third oxygen passage 91 are communicated in this order, the first refrigerant passage 72, the second refrigerant passage 82, and the third refrigerant passage 92 are communicated in this order, and the first nitrogen passage 73, the second nitrogen passage 83, and the third nitrogen passage 93 are communicated in this order.
The input end and the output end of the compressor 1 are respectively provided with a nitrogen input pipe 11 and a compressor output pipe 12, the compressor output pipe 12 is connected with a circulating refrigeration conveying pipe 4 and a liquefaction conveying pipe 5 with a flow regulating valve 51, the liquefaction conveying pipe 5 is further provided with a flow meter 52, and the flow meter 52 is used for monitoring the flow rate of nitrogen in the liquefaction conveying pipe 5. The circulating refrigeration conveying pipe 4 is connected to the secondary supercharging end 31 of the secondary supercharging turboexpander 3, the outlet of the secondary supercharging end 31 of the secondary supercharging turboexpander 3 is connected with the primary supercharging end 21 of the primary supercharging turboexpander 2, and the outlet of the primary supercharging end 21 of the primary supercharging turboexpander 2 is connected with the inlet of the first refrigerant precooling channel 74 of the first precooling heat exchanger 7 through the primary supercharging output pipe 211. An outlet of the first refrigerant pre-cooling channel 74 of the first pre-cooling heat exchanger 7 is communicated with a first-stage expansion end 22 of the first-stage turbo expander 2, an outlet of the first-stage expansion end 22 of the first-stage turbo expander 2 is communicated with an inlet of a third refrigerant pre-cooling channel 94 of the liquefaction heat exchanger 9, an outlet of the third refrigerant pre-cooling channel 94 of the liquefaction heat exchanger 9 is communicated with a second-stage expansion end 32 of the second-stage turbo expander 3, and an outlet of the second-stage expansion end 32 of the second-stage turbo expander 3 is communicated with an inlet of a third refrigerant channel 92 of the liquefaction heat exchanger 9 through a second-stage expansion output pipe 321. The outlet of first refrigerant passage 72 of first pre-cooling heat exchanger 7 is connected to nitrogen inlet line 11 through a return feed tube 721. The inlet of first nitrogen channel 73 of first pre-cooling heat exchanger 7 is connected to liquefaction duct 5. An outlet of the third nitrogen passage 93 of the liquefaction heat exchanger 9 is connected with a liquid nitrogen output pipe 10. The inlet of the first oxygen channel 71 of the first precooling heat exchanger 7 is connected with the input pipe 20 of oxygen to be liquefied, and the outlet of the third oxygen channel 91 of the liquefying heat exchanger 9 is connected with the liquid oxygen output pipe 911 with the liquid oxygen flow pressure regulating valve 912.
In this embodiment, in order to achieve better liquefaction, the liquid nitrogen output pipe 10 is connected to the gas-liquid separation tank 13, and the gas-liquid separation tank 13 is provided with a gas-liquid separation tank output pipe 132 having a liquid nitrogen level control valve 131. The top of the gas-liquid separation tank 13 is provided with a gas outlet pipe 133, and the gas outlet pipe 133 is connected to a secondary expansion outlet pipe 321. The gas-liquid separation tank 13 is provided with a liquid level meter 134. The liquid level meter 134 is used for monitoring the liquid level of the liquid nitrogen in the gas-liquid separation tank 13, and the flow of the nitrogen gas input into the nitrogen gas input pipe 11 can be correspondingly adjusted according to the actual production conditions by monitoring the liquid level of the liquid nitrogen in the gas-liquid separation tank 13, so that the normal operation of the gas-liquid separation tank 13 can be ensured.
In the present embodiment, in order to cool down the supercharged gas, the first cooler 121 is disposed on the compressor output pipe 12, the second cooler 311 is disposed between the outlet of the secondary supercharging end 31 of the secondary supercharging turboexpander 3 and the primary supercharging end 21 of the primary supercharging turboexpander 2, and the third cooler 212 is disposed on the primary supercharging output pipe 211.
The working principle is as follows: the nitrogen input pipe 11 enters the compressor 1 to be pressurized to 11bar, then is cooled to below 40 ℃ by the first cooler 121, and then is divided into two paths, wherein one path enters the circulating refrigeration conveying pipe 4 as a circulating refrigerant, and the other path enters the liquefaction conveying pipe 5 to be liquefied. The nitrogen in the circulating refrigeration conveying pipe 4 is used as a refrigerant after two-stage pressurization and expansion to provide cold energy for nitrogen liquefaction and oxygen liquefaction, and the nitrogen in the liquefaction conveying pipe 5 is sequentially liquefied by a multi-stage cooler and then flows back to a hydrogen precooling unit in the electrolyzed water hydrogen production system to be used as a refrigerant for hydrogen precooling.
Nitrogen in the circulating refrigeration conveying pipe 4 firstly enters a secondary supercharging end 31 of the secondary supercharging turboexpander 3 to be supercharged to 14bar, then is cooled to below 40 ℃ again by a second cooler, then enters a primary supercharging end 21 of the primary supercharging turboexpander 2 to be further supercharged to 17.6 bar, is cooled to 40 ℃ again by a third cooler 212, and then is precooled by a first refrigerant precooling channel 74 of a first precooling heat exchanger 7, is cooled by expansion of a primary expansion end 22 of the primary supercharging turboexpander 2, is precooled by a third refrigerant precooling channel 94 of a liquefaction heat exchanger 9, is cooled by expansion of a secondary expansion end 32 of the secondary supercharging turboexpander 3 again in sequence, and finally liquid nitrogen with the temperature of 84K and the pressure of 1.3bar is formed. Liquid nitrogen which is output by the secondary expansion end 32 of the secondary booster turboexpander 3 and serves as a refrigerant enters the third refrigerant channel 92 of the liquefaction heat exchanger 9, the second refrigerant channel 82 in the second precooling heat exchanger 8 and the first refrigerant channel 72 in the first precooling heat exchanger 7 in sequence through the secondary expansion output pipe 321, so that cold energy is provided for the liquefaction heat exchanger 9, the second precooling heat exchanger 8 and the first precooling heat exchanger 7 in sequence. The nitrogen gas with the released cold energy enters the nitrogen gas input pipe 11 through the backflow conveying pipe 721, is gathered with the nitrogen gas in the nitrogen gas input pipe 11 and then enters the compressor 1 again, and therefore the circulation is achieved continuously.
The nitrogen in the liquefaction conveying pipe 5 sequentially enters a first nitrogen channel 73 of the first precooling heat exchanger 7 for precooling, a second nitrogen channel 83 in the second precooling heat exchanger 8 for precooling again, and a third nitrogen channel 93 in the liquefaction heat exchanger 9 for liquefaction, the liquefied liquid nitrogen is sequentially subjected to gas-liquid separation in a gas-liquid separation tank 13 through a liquid nitrogen output pipe 10, and then the liquid nitrogen with the temperature of 80K and the pressure of 3bar is formed through a liquid nitrogen level control valve 131 and is output from a gas-liquid separation tank output pipe 132. The liquid nitrogen output from the gas-liquid separation tank output pipe 132 is used as a refrigerant for hydrogen pre-cooling.
Oxygen generated by the water electrolysis hydrogen production system passes through the oxygen input pipe 20 to be liquefied, is sequentially pre-cooled by the first oxygen channel 71 arranged in the first pre-cooling heat exchanger 7 for the first time, is pre-cooled again by the second oxygen channel 81 in the second pre-cooling heat exchanger 8, is completely liquefied in the third oxygen channel 91 of the liquefaction heat exchanger 9, and is output and stored through the liquefied liquid oxygen output pipe 911. The liquid oxygen flow rate regulator valve 912 is used to regulate pressure. The temperature of the output liquid oxygen is 95K, and the pressure is 1.5 bar.
The utility model has the advantages that: the liquid nitrogen circulating refrigeration is utilized to liquefy the nitrogen and the oxygen, so that the hydrogen production system by the electrolyzed water can provide liquid hydrogen products and liquid oxygen products, and simultaneously, the liquid nitrogen is provided for a hydrogen pre-cooling unit in the hydrogen production system by the electrolyzed water as a refrigerant for hydrogen pre-cooling, and the whole liquefying device for the oxygen and the nitrogen has the advantages of simple structure, low power consumption and full energy utilization.

Claims (6)

1. The liquefying device matched with oxygen and nitrogen for producing hydrogen by electrolysis comprises: compressor, pressure boost turboexpander, heat exchanger, its characterized in that: the booster turboexpander comprises a primary booster turboexpander and a secondary booster turboexpander, the heat exchangers comprise a first precooling heat exchanger, a second precooling heat exchanger and a liquefying heat exchanger, which are provided with an oxygen channel, a refrigerant channel and a nitrogen channel, all the oxygen channels, all the refrigerant channels and all the nitrogen channels in the first precooling heat exchanger, the second precooling heat exchanger and the liquefying heat exchanger are respectively communicated in sequence, and the refrigerant precooling channels are also arranged in the first precooling heat exchanger and the liquefying heat exchanger; the input end and the output end of the compressor are respectively provided with a nitrogen input pipe and a compressor output pipe, the compressor output pipe is connected with a circulating refrigeration conveying pipe and a liquefaction conveying pipe with a flow regulating valve, the circulating refrigeration conveying pipe is connected to the supercharging end of a two-stage supercharging turboexpander, the outlet of the supercharging end of the two-stage supercharging turboexpander is communicated with the supercharging end of a one-stage supercharging turboexpander, the outlet of the supercharging end of the one-stage supercharging turboexpander is communicated with the inlet of a refrigerant precooling channel of a first precooling heat exchanger, the outlet of the refrigerant precooling channel of the first precooling heat exchanger is communicated with the expansion end of the one-stage supercharging turboexpander, the outlet of the expansion end of the one-stage supercharging turboexpander is communicated with the inlet of the refrigerant precooling channel of the liquefaction heat exchanger, the outlet of the refrigerant precooling channel of the liquefaction heat exchanger is communicated with the expansion end of the two-stage supercharging turboexpander, and the outlet of the expansion end of the two-stage supercharging turboexpander is connected to the liquefaction heat exchanger through a two-stage expansion output pipe The outlet of the refrigerant channel of the first precooling heat exchanger is connected to the nitrogen input pipe through a reflux conveying pipe; the inlet of a nitrogen channel of the first precooling heat exchanger is connected with the liquefaction conveying pipe, and the outlet of the nitrogen channel of the liquefaction heat exchanger is connected with a liquid nitrogen output pipe; the inlet of the oxygen channel of the first precooling heat exchanger is connected with an input pipe of oxygen to be liquefied, and the outlet of the oxygen channel of the liquefying heat exchanger is connected with a liquid oxygen output pipe with a liquid oxygen flow pressure regulating valve.
2. The liquefaction plant of oxygen and nitrogen mated with the electrolytic hydrogen production according to claim 1, characterized in that: the liquid nitrogen output pipe is connected to the gas-liquid separation tank, and the gas-liquid separation tank is provided with a gas-liquid separation tank output pipe with a liquid nitrogen level control valve.
3. The apparatus according to claim 2 for liquefying oxygen and nitrogen in combination with electrolytic hydrogen production, wherein: and a gas output pipe is arranged at the top of the gas-liquid separation tank and is connected to the second-stage expansion output pipe.
4. The liquefying apparatus of oxygen and nitrogen matched with electrolytic hydrogen production according to claim 1, characterized in that: the liquefaction conveying pipe is provided with a flowmeter.
5. The liquefaction plant of oxygen and nitrogen mated with the electrolytic hydrogen production according to claim 1, characterized in that: a first cooler is arranged on the output pipe of the compressor, a second cooler is arranged between the outlet of the boosting end of the secondary boosting turboexpander and the boosting end of the primary boosting turboexpander, and a third cooler is arranged between the outlet of the boosting end of the primary boosting turboexpander and the inlet of the refrigerant precooling channel of the first precooling heat exchanger.
6. The liquefaction plant of oxygen and nitrogen mated with the electrolytic hydrogen production according to claim 1, characterized in that: the gas-liquid separation tank is provided with a liquid level meter.
CN202123376593.6U 2021-12-30 2021-12-30 Matching with liquefying device for oxygen and nitrogen for electrolytic hydrogen production Active CN216814804U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123376593.6U CN216814804U (en) 2021-12-30 2021-12-30 Matching with liquefying device for oxygen and nitrogen for electrolytic hydrogen production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202123376593.6U CN216814804U (en) 2021-12-30 2021-12-30 Matching with liquefying device for oxygen and nitrogen for electrolytic hydrogen production

Publications (1)

Publication Number Publication Date
CN216814804U true CN216814804U (en) 2022-06-24

Family

ID=82062831

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202123376593.6U Active CN216814804U (en) 2021-12-30 2021-12-30 Matching with liquefying device for oxygen and nitrogen for electrolytic hydrogen production

Country Status (1)

Country Link
CN (1) CN216814804U (en)

Similar Documents

Publication Publication Date Title
WO2021043182A1 (en) Air separation apparatus and method using lng cold energy
CN109140903B (en) Air separation system and air separation method utilizing cold energy of liquefied natural gas
WO2023272971A1 (en) Hydrogen liquefaction system
CN114111215A (en) Device for preparing liquid hydrogen by using low-temperature hydrogen-containing mixed gas and using method
CN202361751U (en) Device for refrigerating liquefied natural gas by adopting single mixed refrigerant
CN113865263A (en) Production system for extracting crude helium and co-producing liquefied natural gas by natural gas
CN113503691B (en) Two-stage compression circulation nitrogen liquefying device and liquefying method thereof
CN114111214A (en) Low-temperature hydrogen liquefaction device and use method
CN105972934A (en) Liquefying device for achieving liquid argon cold energy recovery
CN216814804U (en) Matching with liquefying device for oxygen and nitrogen for electrolytic hydrogen production
CN112229142A (en) Low-coupling multi-strand composite expansion air separation flow device and method
WO2023226639A1 (en) Modular hydrogen liquefaction system
CN204693949U (en) A kind of separation high methane gas device with n-formyl sarcolysine alkane refrigerating function
CN214333201U (en) Low-coupling multi-strand composite expansion air separation flow device
CN114877619B (en) System and method for liquefying carbon dioxide
CN114777412B (en) Hydrogen liquefying plant with thermal siphon type hydrogen subcooler
CN211782276U (en) Air separation system capable of improving yield and reducing energy consumption
CN114543444A (en) Multi-refrigerant cold box separation system for propane dehydrogenation and process method
CN213578367U (en) Device for producing oxygen and nitrogen by separating air through cryogenic rectification
CN108036585B (en) Heat pump air separation system for LNG cold energy utilization
CN209605479U (en) Pressure rectifying column reduces space division power consumption device in a kind of use
CN211977383U (en) Helium liquefying and helium cold source supply device with different temperature grades
CN108007068B (en) Heat integration rectification air separation system for LNG cold energy utilization
CN214620293U (en) Coal bed gas liquefaction system
CN220472018U (en) High-pressure natural gas two-stage expansion liquefying device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant