CN109341193A - A kind of peak-trough electricity production liquid oxygen liquid nitrogen plan and method - Google Patents

A kind of peak-trough electricity production liquid oxygen liquid nitrogen plan and method Download PDF

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Publication number
CN109341193A
CN109341193A CN201811363624.4A CN201811363624A CN109341193A CN 109341193 A CN109341193 A CN 109341193A CN 201811363624 A CN201811363624 A CN 201811363624A CN 109341193 A CN109341193 A CN 109341193A
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China
Prior art keywords
nitrogen
heat exchanger
tower
liquid
rectifying column
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Pending
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CN201811363624.4A
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Chinese (zh)
Inventor
蔡斌斌
吴志会
蔡福梅
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Zhejiang Yuandao Power Group Co ltd
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HANGZHOU KAIDE KONGFEN EQUIPMENT CO Ltd
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Priority to CN201811363624.4A priority Critical patent/CN109341193A/en
Publication of CN109341193A publication Critical patent/CN109341193A/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
    • 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
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/0015—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
    • F25J1/0037—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work of a return stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0201—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
    • F25J1/0228—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
    • 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
    • F25J3/04151—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
    • F25J3/04218—Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
    • F25J3/04224—Cores associated with a liquefaction or refrigeration 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
    • 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
    • F25J3/04333—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.
    • F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
    • 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
    • F25J3/04406—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 using a dual pressure main column system
    • F25J3/04412—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 using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • 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
    • F25J3/04472—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 using the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages
    • F25J3/04496—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 using the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages for compensating variable air feed or variable product demand by alternating between periods of liquid storage and liquid assist
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/42—Nitrogen or special cases, e.g. multiple or low purity N2
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/50—Oxygen or special cases, e.g. isotope-mixtures or low purity O2
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/04—Internal refrigeration with work-producing gas expansion loop
    • F25J2270/06—Internal refrigeration with work-producing gas expansion loop with multiple gas expansion loops

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

Abstract

The present invention discloses a kind of peak-trough electricity production liquid oxygen liquid nitrogen plan, including tower under rectifying column, tower, condenser/evaporator, First Heat Exchanger, the second heat exchanger, the first subcooler, the second subcooler, high temperature expander, cryogenic expansion machine, high temperature expander pressurized end, cryogenic expansion machine pressurized end, nitrogen circulation compressor, nitrogen supercharging machine on rectifying column.The present invention responds the electricity consumption policy of country, daytime high rate period nitrogen conveyer, nitrogen circulation compressor etc. produces each component of liquid nitrogen and stops working, in the high period reduction electric consumption of electricity consumption electricity price, top of tower on rectifying column is recycled into the liquid nitrogen in liquid nitrogen storage tank, rectifying column works normally, and produces liquid oxygen product；The low period running at full capacity equipment of evening electricity consumption electricity price also produces liquid nitrogen product while producing liquid oxygen, and is stored into liquid nitrogen storage tank, in case daytime (electricity consumption electricity price high period) re-injection, is used as the energy.The production cost for reducing enterprise, greatly improves social benefit, also creates the economic value of enterprise.

Description

A kind of peak-trough electricity production liquid oxygen liquid nitrogen plan and method
Technical field
The present invention relates to technical field of air separation, and in particular to a kind of peak-trough electricity production liquid oxygen liquid nitrogen plan and method.
Background technique
Industrial gasses are industrial development " blood ", and air separation unit is exactly the machine for creating " blood ".Air separation unit is extensive Applied to the row such as steel, chemical industry, non-ferrous metal, electronics, new material, photovoltaic, the energy, aerospace, wastewater treatment, medical medicine Industry.
Domestic at present, all in the world air separation unit is all to be freezed using compressed air/nitrogen into expander cycle, is produced Oxygen nitrogen product out, compressor operating just need to consume a large amount of electric energy, and want operating acting incessantly in 24 hours, Cai Nengbao Demonstrate,prove the product of output qualification.In this case, regardless of peak of power consumption and low power consumption require the power supply of balance and stability, Consume electric energy.The main production cost of air separation unit is exactly the consumption of electric energy, in order to reduce production cost, adapts to the political affairs of state's household electric Plan, to develop the design present invention.
Summary of the invention
The object of the present invention is to provide a kind of peak-trough electricity production liquid oxygen liquid nitrogen plan and methods, to solve the prior art not Foot.
The invention adopts the following technical scheme:
A kind of peak-trough electricity produces liquid oxygen liquid nitrogen plan, including tower under rectifying column, tower, condenser/evaporator, first on rectifying column Heat exchanger, the second heat exchanger, the first subcooler, the second subcooler, high temperature expander, cryogenic expansion machine, high temperature expander pressurization End, cryogenic expansion machine pressurized end, nitrogen circulation compressor, nitrogen supercharging machine, tower under rectifying column, tower, condensation evaporation on rectifying column Device, First Heat Exchanger, the second heat exchanger, the first subcooler, the second subcooler, high temperature expander, cryogenic expansion machine are set to ice chest Interior, high temperature expander pressurized end, cryogenic expansion machine pressurized end, nitrogen circulation compressor, nitrogen supercharging machine are set to outside ice chest, condensation Evaporator is set to tower under rectifying column, on rectifying column between tower；
First Heat Exchanger is connected with the raw air import of tower under rectifying column, the nitrogen outlet of top of tower and cold under rectifying column The liquid nitrogen outlet of solidifying evaporator connection, condenser/evaporator is connected with top of tower, the first subcooler under rectifying column respectively, the first supercooling Device is connected with top of tower on rectifying column；The oxygen-enriched liquid air outlet of tower bottom is connected with the first subcooler under rectifying column, the first supercooling Connection in the middle part of tower on device and rectifying column；
The liquid oxygen outlet of tower bottom is connected with condenser/evaporator on rectifying column, the liquid oxygen outlet of condenser/evaporator and the first mistake Cooler connection, the first subcooler are connected with external liquid oxygen vessel；The dirty nitrogen outlet of tower middle and upper part and the first supercooling on rectifying column Device connection, the first subcooler are connected with First Heat Exchanger, First Heat Exchanger and the connection of the first exhausting pipeline；Top of tower on rectifying column Pure nitrogen gas outlet connected with the first subcooler, the first subcooler is connected with First Heat Exchanger, First Heat Exchanger first outlet It is connected by external nitrogen conveyer with nitrogen circulation compressor, second outlet is connected with external pure nitrogen gas storage device；
Nitrogen circulation compressor drinks the pre-cooling import connection of the 5th exhausting pipeline, the second heat exchanger, the second heat exchanger respectively Pre-cooling outlet connected respectively with the second exhausting pipeline, high temperature expander, the part re-heat of high temperature expander and the second heat exchanger Import connection, the part re-heat outlet of the second heat exchanger are connected with high temperature expander pressurized end, cryogenic expansion machine pressurized end, low temperature Expanding machine pressurized end is connected with the cooling import in the part of the second heat exchanger, the cooling import of the second heat exchanger respectively, the second heat exchange The part coolant outlet of device is connected with the 4th exhausting pipeline, cryogenic expansion machine respectively, cryogenic expansion machine and the connection of the second heat exchanger, Second heat exchanger is connected with nitrogen circulation compressor, the coolant outlet of the second heat exchanger respectively with third exhausting pipeline, the second mistake Cooler connection, the second subcooler are connected with external liquid nitrogen storage tank, and external liquid nitrogen storage tank is connected with top of tower on rectifying column；
At night, First Heat Exchanger first outlet connecting line is connected to, and second outlet connecting line disconnects, the equal work of whole device Make；Daytime, First Heat Exchanger first outlet connecting line disconnect, and second outlet connecting line is opened, and are compressed using nitrogen circulation Mechanism takes each component of liquid nitrogen to stop working, and the liquid nitrogen by producing storage inside liquid nitrogen storage tank at night is supplied to tower on rectifying column.
Further, external liquid nitrogen storage tank and the connection of the second subcooler, the second subcooler and the connection of the second heat exchanger, second Heat exchanger is connected with nitrogen supercharging machine, and nitrogen supercharging machine is connected with nitrogen circulation compressor, to produce pure nitrogen gas using liquid nitrogen For nitrogen circulation compressor.
Further, external liquid nitrogen storage tank and the connection of the second heat exchanger, the second heat exchanger are connected with nitrogen supercharging machine, nitrogen Supercharger is connected with nitrogen circulation compressor, to utilize liquid nitrogen vapor in liquid nitrogen storage tank.
Further, a branch pipe is set on the cooling import of the second heat exchanger and coolant outlet connecting line, respectively and high temperature Expanding machine, cryogenic expansion machine connection, for adjusting high temperature expander, cryogenic expansion machine temperature.
Further, it is additionally provided with heating and blows down pipeline, pipeline difference high temperature expander outlet and low-temperature expansion are blown down in heating Machine outlet.
A kind of peak-trough electricity production liquid oxygen liquid nitrogen method, includes the following steps:
Evening workflow:
Step 1: the raw air after pressurized purge enters after First Heat Exchanger temperature drops to saturated liquid temperature, enter Tower bottom rectifying is separated into oxygen-enriched liquid air and nitrogen under rectifying column；Nitrogen introduces condenser/evaporator as heat source, and nitrogen is condensed into Liquid nitrogen introduces tower under rectifying column and throttles after the supercooling of the first subcooler as phegma, another part after the throttling of liquid nitrogen a part Tower is as phegma on into rectifying column；Oxygen-enriched liquid air, which introduces, participates in rectifying in the middle part of tower on rectifying column；
Step 2: tower bottom liquid oxygen is further increased as condenser/evaporator cold source, liquid oxygen purity on rectifying column, obtain pure The qualified liquid oxygen product of 99.6% or more degree, cooling box is transported to liquid oxygen vessel after the supercooling of the first subcooler；Tower on rectifying column It extracts dirty nitrogen cooling box after the first subcooler, First Heat Exchanger re-heat out and is vented in middle and upper part；Top of tower pure nitrogen gas on rectifying column Body extraction cooling box after the first subcooler, First Heat Exchanger re-heat delivers into nitrogen circulation compression by nitrogen conveyer Machine；
Step 3: pure nitrogen gas is high pressure pure nitrogen gas through nitrogen circulation compressor compresses, high pressure pure nitrogen gas part is put Sky, remaining enters the second heat exchanger, is partially vented after pre-cooling, remaining enters high temperature expander, swell refrigeration, the low temperature after expansion Pure nitrogen gas again returns to the second heat exchanger, and cooling box enters high temperature expander pressurized end after the re-heat of part, cryogenic expansion machine increases Pressure side carries out expansion work recycling, adherence pressure, and the pure nitrogen gas after a part of adherence pressure enters the second heat exchanger section and cools down, Extraction section is vented after part is cooling, remaining enters cryogenic expansion machine, swell refrigeration, and the cryogenic gas after expansion enters second and changes Enter nitrogen circulation compressor after hot device re-heat；Pure nitrogen gas after another part adherence pressure enters the second heat exchanger, the After the liquefaction of two exchanger bases, part is vented, remaining becomes low pressure liquid by throttle valve, enters back into the supercooling of the second subcooler, Cooling box afterwards enters liquid nitrogen storage tank by vacuum heat-insulated pipe, and tower on rectifying column is partially supplied to partially to deposit as phegma Storage, which is got up, is supplied on rectifying column tower as phegma daytime；
Work by day process:
Step 1: the raw air after pressurized purge enters after First Heat Exchanger temperature drops to saturated liquid temperature, enter Tower bottom rectifying is separated into oxygen-enriched liquid air and nitrogen under rectifying column；Nitrogen introduces condenser/evaporator as heat source, and nitrogen is condensed into Liquid nitrogen introduces tower under rectifying column and throttles after the supercooling of the first subcooler as phegma, another part after the throttling of liquid nitrogen a part Tower is as phegma on into rectifying column；Oxygen-enriched liquid air, which introduces, participates in rectifying in the middle part of tower on rectifying column；
Step 2: tower bottom liquid oxygen is further increased as condenser/evaporator cold source, liquid oxygen purity on rectifying column, obtain pure The qualified liquid oxygen product of 99.6% or more degree, cooling box is transported to liquid oxygen vessel after the supercooling of the first subcooler；Tower on rectifying column It extracts dirty nitrogen cooling box after the first subcooler, First Heat Exchanger re-heat out and is vented in middle and upper part；Top of tower pure nitrogen gas on rectifying column Body extraction cooling box after the first subcooler, First Heat Exchanger re-heat, as pure nitrogen gas product supply to user；
Step 3: the liquid nitrogen that liquid nitrogen storage tank produces storage at night is supplied on rectifying column tower as phegma.
Further, part liquid nitrogen enters nitrogen supercharging after the second subcooler, the second heat exchanger re-heat in liquid nitrogen storage tank Machine enters back into nitrogen circulation compressor, to produce pure nitrogen gas for nitrogen circulation compressor using liquid nitrogen.
Further, liquid nitrogen vapor enters nitrogen supercharging machine after the second heat exchanger re-heat in liquid nitrogen storage tank, enters back into nitrogen Gas recycle compressor, to utilize liquid nitrogen vapor in liquid nitrogen storage tank.
Further, the pure nitrogen gas after another part adherence pressure enters the second heat exchanger, in the second exchanger base Extraction section pure nitrogen gas enters high temperature expander before liquefying, for adjusting high temperature expander temperature；Extraction section pure nitrogen gas Into cryogenic expansion machine, for adjusting cryogenic expansion machine temperature.
Beneficial effects of the present invention:
1, the present invention response country electricity consumption policy, daytime high rate period nitrogen conveyer, nitrogen circulation compressor It stops working etc. each component for producing liquid nitrogen, in the high period reduction electric consumption of electricity consumption electricity price, is returned with the liquid nitrogen in liquid nitrogen storage tank Top of tower on rectifying column is infused, rectifying column works normally, and produces liquid oxygen product；The electricity consumption electricity price low period transports at full capacity at night Turn equipment, also produce liquid nitrogen product while producing liquid oxygen, and be stored into liquid nitrogen storage tank, in case daytime (electricity consumption electricity price high period) Re-injection is used as the energy.The present invention can produce liquid oxygen purity >=99.6% and produce 99.999% liquid nitrogen product. The present invention can be consumed different electric energy by the tensity that power grid is supplied in different time sections, can accomplish balmy and bracing, reply Steady production qualified products freely.Electricity consumption is balanced in this way, not only responds national policy, but also alleviate power load, is also client's section About nearly 30% production cost.
2, the supplement of nitrogen circulation, which generally requires outsourcing deposit, just can guarantee the normal operation of device, and the present invention can benefit Produce a large amount of liquid nitrogen product with off-peak electricity price period, accomplish that oneself is self-sustaining, be not required to additionally consume electric energy, reduce operation at This.
3, present invention employs two-tower rectification, there are liquid nitrogen re-injection mouths for tower top, regardless of any time can steady production conjunction Lattice product is not required to manually convert operating condition, eliminates switching operating condition work complicated for operation, has very to the operation fatigue level of device Big reduction.
4, the present invention can not only produce the liquid oxygen product that purity is greater than 99.6% in nominal situation, moreover it is possible to while production 3 The liquid nitrogen product of times liquid oxygen.When such as emergency power off or turnaround of unit, it can be used and provided from the liquid nitrogen re-injection ice chest of production Cooling capacity still can be produced normally.
5, when the present invention works by day, it is possible to provide user's pure nitrogen gas byproduct increases business economic income.
6, apparatus of the present invention are compact-sized, an ice chest existing rectifying separation production high purity oxygen, nitrogen product, and have nitrogen The gas liquefaction circulatory system produces the liquid nitrogen of about 3 times of liquid oxygen products, oneself is self-sustaining.
To sum up, the present invention can reduce power consumption in the peak of power consumption period, consume electric energy again in low power consumption, this Sample can balance the total supply of national grid, and reduce the production cost of enterprise, greatly increase social benefit, Create the economic value of enterprise.
Detailed description of the invention
Fig. 1 is schematic structural diagram of the device of the invention.
Tower 1 under rectifying column, tower 2, condenser/evaporator 3, First Heat Exchanger 4, the supercooling of the second heat exchanger 5, first on rectifying column Device 6, the second subcooler 7, high temperature expander 8, cryogenic expansion machine 9, high temperature expander pressurized end 10, cryogenic expansion machine pressurized end 11, nitrogen circulation compressor 12, nitrogen supercharging machine 13, liquid nitrogen storage tank 14, liquid oxygen vessel 15；Preheating inlet 5-1, preheating outlet 5- 2, part re-heat import 5-3, part re-heat outlet 5-4, the cooling import 5-5 in part, part coolant outlet 5-6, cooling import 5- 7, coolant outlet 5-8；V1, V2, V6, V7, V9 be throttle valve, V3, V4, V10, V13, V14, V15 be regulating valve, V5, V8, V11, V12, V16, V17, V18, V21 are switch valve, and V19, V20 are angle valve, and V22, V24 are check-valves, and V23, V25 are shut-off valve.
Specific embodiment
The present invention is done below with reference to embodiment and attached drawing and is further explained.The following example is merely to illustrate this hair It is bright, but be not used to limit practical range of the invention.
A kind of peak-trough electricity production liquid oxygen liquid nitrogen plan, as shown in Figure 1, including tower 1 under rectifying column, tower 2, condensation on rectifying column Evaporator 3, First Heat Exchanger 4, the second heat exchanger 5, the first subcooler 6, the second subcooler 7, high temperature expander 8, low-temperature expansion Machine 9, high temperature expander pressurized end 10, cryogenic expansion machine pressurized end 11, nitrogen circulation compressor 12, nitrogen supercharging machine 13, rectifying Tower 1 under tower, tower 2, condenser/evaporator 3, First Heat Exchanger 4, the second heat exchanger 5, the supercooling of the first subcooler 6, second on rectifying column Device 7, high temperature expander 8, cryogenic expansion machine 9 be set to ice chest in, high temperature expander pressurized end 10, cryogenic expansion machine pressurized end 11, Nitrogen circulation compressor 12, nitrogen supercharging machine 13 are set to outside ice chest, and condenser/evaporator 3 is set to tower 1 under rectifying column, tower on rectifying column Between 2；
First Heat Exchanger 4 is connected with the raw air import of tower 1 under rectifying column, the nitrogen outlet at 1 top of tower under rectifying column It being connected with condenser/evaporator 3, the liquid nitrogen outlet of condenser/evaporator 3 is connected with 1 top of tower, the first subcooler 6 under rectifying column respectively, It is connected at the top of tower 2 on first subcooler 6 and rectifying column；The oxygen-enriched liquid air outlet of 1 bottom of tower and the first subcooler 6 connect under rectifying column It connects, is connected in the middle part of tower 2 on the first subcooler 6 and rectifying column；
The liquid oxygen outlet of 2 bottom of tower and condenser/evaporator 3 connect on rectifying column, the liquid oxygen of condenser/evaporator 3 outlet and the The connection of one subcooler 6, the first subcooler 6 and external liquid oxygen vessel connect 15 and connect；On rectifying column the dirty nitrogen outlet of 2 middle and upper part of tower and The connection of first subcooler 6, the first subcooler 6 and First Heat Exchanger 4 connect, and First Heat Exchanger 4 is connected with the first exhausting pipeline；Essence The pure nitrogen gas outlet and the connection of the first subcooler 7 at 2 top of tower on tower are evaporated, the first subcooler 7 and First Heat Exchanger 4 connect, the One heat exchanger, 4 first outlet is connected by external nitrogen conveyer and nitrogen circulation compressor 12, second outlet and external purity nitrogen Gas storage device connects (not indicating in figure)；
Nitrogen circulation compressor 12 is connected with the pre-cooling import 5-1 of the 5th exhausting pipeline, the second heat exchanger 5 respectively, and second The pre-cooling outlet 5-2 of heat exchanger 5 is connected with the second exhausting pipeline, high temperature expander 8 respectively, high temperature expander 8 and the second heat exchange The part re-heat import 5-3 connection of device 5, the part re-heat outlet 5-4 of the second heat exchanger 5 and high temperature expander pressurized end 10, low Warm expanding machine pressurized end 11 connects, cryogenic expansion machine pressurized end 11 respectively with the cooling import 5-5 in the part of the second heat exchanger 5, the The cooling import 5-7 connection of two heat exchangers 5, the part coolant outlet 5-6 of the second heat exchanger 5 respectively with the 4th exhausting pipeline, low Warm expanding machine 9 connects, and cryogenic expansion machine 9 and the connection of the second heat exchanger 5, the second heat exchanger 5 and nitrogen circulation compressor 12 connect, The coolant outlet 5-8 of second heat exchanger 5 is connected with third exhausting pipeline, the second subcooler 7 respectively, the cooling of the second heat exchanger 5 A branch pipe is set on import 5-7 and coolant outlet 5-8 connecting line, connects, is used for high temperature expander 8, cryogenic expansion machine 9 respectively High temperature expander 8,9 temperature of cryogenic expansion machine are adjusted, the second subcooler 7 and external liquid nitrogen storage tank 14 connect, external liquid nitrogen storage tank 14 and rectifying column on connect at the top of tower 2, for providing liquid nitrogen at the top of tower 2 on rectifying column；External liquid nitrogen storage tank 14 and the second mistake Cooler 7 connects, and the second subcooler 7 and the connection of the second heat exchanger 5, the second heat exchanger 5 and nitrogen supercharging machine 13 connect, nitrogen supercharging Machine 13 and nitrogen circulation compressor 12 connect, to produce pure nitrogen gas for nitrogen circulation compressor using liquid nitrogen；External liquid nitrogen storage Slot 14 and the connection of the second heat exchanger 5, the second heat exchanger 5 and nitrogen supercharging machine 13 connect, nitrogen supercharging machine 13 and nitrogen circulation pressure Contracting machine 12 connects, to utilize liquid nitrogen vapor in liquid nitrogen storage tank 14.
The present invention is additionally provided with heating and blows down pipeline, and pipeline difference high temperature expander 8 outlet and cryogenic expansion machine 9 are blown down in heating Outlet.
At night, 4 first outlet connecting line of First Heat Exchanger is connected to, and second outlet connecting line disconnects, and whole device is equal Work；Daytime, 4 first outlet connecting line of First Heat Exchanger disconnect, and second outlet connecting line is opened, and utilize nitrogen circulation pressure Each component that contracting machine 12 produces liquid nitrogen stops working, and is supplied to rectifying column by the liquid nitrogen that storage is produced in 14 the inside of liquid nitrogen storage tank at night Upper tower 2.
A kind of peak-trough electricity production liquid oxygen liquid nitrogen method, includes the following steps:
Evening workflow:
Step 1: raw air removes dust, impurity in air through filter, arrived into air compressor promotion 0.8MPa or so after pre-cooled unit pre-cooling, into purification system, removes the substances such as water, the carbon dioxide in air, pressurization is net Raw air after change enters after 4 temperature of First Heat Exchanger drops to saturated liquid temperature, into rectifying column under 1 bottom rectifying of tower point From for oxygen-enriched liquid air and nitrogen；Nitrogen introduces condenser/evaporator 3 and is used as heat source, and nitrogen is condensed into liquid nitrogen, the throttling of liquid nitrogen a part Tower 1 under rectifying column is introduced afterwards and is used as phegma, and another part enters tower 2 on rectifying column through the first subcooler 6 supercooling deutomerite stream and makees For phegma；Oxygen-enriched liquid air introduces on rectifying column and participates in rectifying in the middle part of tower 2；
Step 2: as 3 cold source of condenser/evaporator, liquid oxygen purity is further increased, is obtained 2 bottom liquid oxygen of tower on rectifying column The qualified liquid oxygen product of 99.6% or more purity, cooling box is transported to liquid oxygen vessel 15 after the supercooling of the first subcooler 6；Rectifying column It extracts dirty nitrogen cooling box after the first subcooler 6,4 re-heat of First Heat Exchanger out and is vented in upper 2 middle and upper part of tower；Tower 2 pushes up on rectifying column Portion's pure nitrogen gas extraction cooling box after the first subcooler 6,5 re-heat of First Heat Exchanger, delivers into nitrogen by nitrogen conveyer Gas recycle compressor 12；
Step 3: pure nitrogen gas is through 12 boil down to high pressure pure nitrogen gas of nitrogen circulation compressor, high pressure pure nitrogen gas part Emptying, remaining enters the second heat exchanger 5, is partially vented after pre-cooling, remaining enters high temperature expander 8, swell refrigeration, after expansion Low temperature pure nitrogen gas again returns to the second heat exchanger 5, and it is swollen to enter high temperature expander pressurized end 10, low temperature for cooling box after the re-heat of part Swollen machine pressurized end 11 carries out expansion work recycling, adherence pressure, and the pure nitrogen gas after a part of adherence pressure enters the second heat exchanger 5 Part is cooling, and extraction section is vented after part is cooling, remaining enters cryogenic expansion machine 9, swell refrigeration, the cryogenic gas after expansion Enter nitrogen circulation compressor 12 after into 5 re-heat of the second heat exchanger；Pure nitrogen gas after another part adherence pressure enters the Two heat exchangers 5, extraction section pure nitrogen gas enters high temperature expander 8 before 5 bottom of the second heat exchanger is liquefied, for adjusting high temperature 8 temperature of expanding machine, extraction section pure nitrogen gas enter cryogenic expansion machine 9, for adjusting 9 temperature of cryogenic expansion machine, change second After hot 5 bottom of device liquefaction, part is vented, remaining becomes low pressure liquid by throttle valve, enters back into the supercooling of the second subcooler 7, after Cooling box enters liquid nitrogen storage tank 14 by vacuum heat-insulated pipe, and part liquid nitrogen delivers on rectifying column in liquid nitrogen storage tank 14 Phegma is used as at the top of tower 2, part liquid nitrogen, which stores, is supplied on rectifying column tower 2 to be used as phegma daytime, partially can be through the Enter nitrogen supercharging machine 13 after two subcoolers 7,5 re-heat of the second heat exchanger, enter back into nitrogen circulation compressor 12, to utilize liquid nitrogen Pure nitrogen gas is produced for nitrogen circulation compressor 12；Liquid nitrogen vapor enters nitrogen after 5 re-heat of the second heat exchanger in liquid nitrogen storage tank 14 Gas supercharger 13 enters back into nitrogen circulation compressor 12, to utilize liquid nitrogen vapor in liquid nitrogen storage tank 14；
Work by day process:
Step 1: the raw air after pressurized purge enters after 4 temperature of First Heat Exchanger drops to saturated liquid temperature, enter 1 bottom rectifying of tower is separated into oxygen-enriched liquid air and nitrogen under rectifying column；Nitrogen introduces condenser/evaporator 3 and is used as heat source, nitrogen condensation For liquid nitrogen, tower 1 under rectifying column is introduced after the throttling of liquid nitrogen a part and is used as phegma, another part is after the supercooling of the first subcooler 6 Throttling is into tower on rectifying column 2 as phegma；Oxygen-enriched liquid air introduces on rectifying column and participates in rectifying in the middle part of tower 2；
Step 2: as 3 cold source of condenser/evaporator, liquid oxygen purity is further increased, is obtained 2 bottom liquid oxygen of tower on rectifying column The qualified liquid oxygen product of 99.6% or more purity, cooling box is transported to liquid oxygen vessel 15 after the supercooling of the first subcooler 6；Rectifying column It extracts dirty nitrogen cooling box after the first subcooler 6,4 re-heat of First Heat Exchanger out and is vented in upper 2 middle and upper part of tower；Tower 2 pushes up on rectifying column Portion's pure nitrogen gas extraction cooling box after the first subcooler 6,5 re-heat of First Heat Exchanger, as pure nitrogen gas product supply to use Family；
Step 3: the liquid nitrogen that 14 evening of liquid nitrogen storage tank produces storage is supplied to tower 2 on rectifying column to be used as phegma.

Claims (9)

1. a kind of peak-trough electricity produces liquid oxygen liquid nitrogen plan, which is characterized in that steamed including tower, condensation on tower under rectifying column, rectifying column It is swollen to send out device, First Heat Exchanger, the second heat exchanger, the first subcooler, the second subcooler, high temperature expander, cryogenic expansion machine, high temperature Swollen machine pressurized end, cryogenic expansion machine pressurized end, nitrogen circulation compressor, nitrogen supercharging machine, tower under rectifying column, tower on rectifying column, Condenser/evaporator, First Heat Exchanger, the second heat exchanger, the first subcooler, the second subcooler, high temperature expander, cryogenic expansion machine In ice chest, high temperature expander pressurized end, cryogenic expansion machine pressurized end, nitrogen circulation compressor, nitrogen supercharging machine are set to cold Outside case, condenser/evaporator is set to tower under rectifying column, on rectifying column between tower；
First Heat Exchanger is connected with the raw air import of tower under rectifying column, and the nitrogen outlet of top of tower and condensation are steamed under rectifying column Send out device connection, condenser/evaporator liquid nitrogen outlet connect respectively with top of tower, the first subcooler under rectifying column, the first subcooler with Top of tower connects on rectifying column；Under rectifying column tower bottom oxygen-enriched liquid air outlet connected with the first subcooler, the first subcooler with Connection in the middle part of tower on rectifying column；
The liquid oxygen outlet of tower bottom is connected with condenser/evaporator on rectifying column, the liquid oxygen outlet of condenser/evaporator and the first subcooler Connection, the first subcooler are connected with external liquid oxygen vessel；The dirty nitrogen outlet and the first subcooler of tower middle and upper part connect on rectifying column It connects, the first subcooler is connected with First Heat Exchanger, First Heat Exchanger and the connection of the first exhausting pipeline；Top of tower is pure on rectifying column Nitrogen outlet is connected with the first subcooler, and the first subcooler is connected with First Heat Exchanger, and First Heat Exchanger first outlet passes through External nitrogen conveyer is connected with nitrogen circulation compressor, and second outlet is connected with external pure nitrogen gas storage device；
Nitrogen circulation compressor is connected with the pre-cooling import of the 5th exhausting pipeline, the second heat exchanger respectively, the second heat exchanger it is pre- Cold outlet is connected with the second exhausting pipeline, high temperature expander respectively, the part re-heat import of high temperature expander and the second heat exchanger Connection, the part re-heat outlet of the second heat exchanger are connected with high temperature expander pressurized end, cryogenic expansion machine pressurized end, low-temperature expansion Machine pressurized end is connected with the cooling import in the part of the second heat exchanger, the cooling import of the second heat exchanger respectively, the second heat exchanger Part coolant outlet is connected with the 4th exhausting pipeline, cryogenic expansion machine respectively, cryogenic expansion machine and the connection of the second heat exchanger, and second Heat exchanger is connected with nitrogen circulation compressor, the coolant outlet of the second heat exchanger respectively with third exhausting pipeline, the second subcooler Connection, the second subcooler are connected with external liquid nitrogen storage tank, and external liquid nitrogen storage tank is connected with top of tower on rectifying column；
At night, First Heat Exchanger first outlet connecting line is connected to, and second outlet connecting line disconnects, and whole device works； Daytime, First Heat Exchanger first outlet connecting line disconnect, and second outlet connecting line is opened, and utilize nitrogen circulation compression mechanism Each component of liquid nitrogen is taken to stop working, the liquid nitrogen by producing storage inside liquid nitrogen storage tank at night is supplied to tower on rectifying column.
2. peak-trough electricity according to claim 1 produces liquid oxygen liquid nitrogen plan, which is characterized in that external liquid nitrogen storage tank and second Subcooler connection, the second subcooler and the connection of the second heat exchanger, the second heat exchanger connect with nitrogen supercharging machine, nitrogen supercharging machine with Nitrogen circulation compressor connection, to produce pure nitrogen gas for nitrogen circulation compressor using liquid nitrogen.
3. peak-trough electricity according to claim 1 produces liquid oxygen liquid nitrogen plan, which is characterized in that external liquid nitrogen storage tank and second Heat exchanger connection, the second heat exchanger are connected with nitrogen supercharging machine, and nitrogen supercharging machine is connected with nitrogen circulation compressor, to utilize liquid Liquid nitrogen vapor in nitrogen storage tank.
4. peak-trough electricity according to claim 1 produces liquid oxygen liquid nitrogen plan, which is characterized in that the cooling of the second heat exchanger into A branch pipe is set on mouth and coolant outlet connecting line, is connected respectively with high temperature expander, cryogenic expansion machine, it is swollen for adjusting high temperature Swollen machine, cryogenic expansion machine temperature.
5. peak-trough electricity according to claim 1 produces liquid oxygen liquid nitrogen plan, which is characterized in that be additionally provided with heating blow-off pipe Pipeline difference high temperature expander outlet and cryogenic expansion machine outlet are blown down in road, heating.
6. a kind of peak-trough electricity produces liquid oxygen liquid nitrogen method, which comprises the steps of:
Evening workflow:
Step 1: the raw air after pressurized purge enters after First Heat Exchanger temperature drops to saturated liquid temperature, into rectifying Tower bottom rectifying is separated into oxygen-enriched liquid air and nitrogen under tower；Nitrogen introduces condenser/evaporator as heat source, and nitrogen is condensed into liquid nitrogen, Tower under rectifying column is introduced after the throttling of liquid nitrogen a part, and, as phegma, another part is subcooled deutomerite stream through the first subcooler and enters essence Tower is evaporated on tower as phegma；Oxygen-enriched liquid air, which introduces, participates in rectifying in the middle part of tower on rectifying column；
Step 2: tower bottom liquid oxygen is further increased as condenser/evaporator cold source, liquid oxygen purity on rectifying column, purity is obtained 99.6% or more qualified liquid oxygen product, cooling box is transported to liquid oxygen vessel after the supercooling of the first subcooler；On rectifying column in tower It extracts dirty nitrogen cooling box after the first subcooler, First Heat Exchanger re-heat out and is vented in top；Top of tower pure nitrogen gas on rectifying column Extraction cooling box after the first subcooler, First Heat Exchanger re-heat, delivers into nitrogen circulation compressor by nitrogen conveyer；
Step 3: pure nitrogen gas is high pressure pure nitrogen gas through nitrogen circulation compressor compresses, high pressure pure nitrogen gas part is vented, It is remaining to enter the second heat exchanger, it is partially vented after pre-cooling, remaining enters high temperature expander, swell refrigeration, the low temperature purity nitrogen after expansion Gas again returns to the second heat exchanger, and cooling box enters high temperature expander pressurized end, cryogenic expansion machine pressurized end after the re-heat of part Expansion work recycling, adherence pressure are carried out, the pure nitrogen gas after a part of adherence pressure enters the second heat exchanger section and cools down, part Extraction section is vented after cooling, remaining enters cryogenic expansion machine, swell refrigeration, and the cryogenic gas after expansion enters the second heat exchanger Enter nitrogen circulation compressor after re-heat；Pure nitrogen gas after another part adherence pressure enters the second heat exchanger, changes second After hot device bottom liquefaction, part is vented, remaining becomes low pressure liquid by throttle valve, is entered back into the supercooling of the second subcooler, is gone out afterwards Ice chest enters liquid nitrogen storage tank by vacuum heat-insulated pipe, and tower on rectifying column is partially supplied to store as phegma, part To be supplied on rectifying column daytime tower as phegma；
Work by day process:
Step 1: the raw air after pressurized purge enters after First Heat Exchanger temperature drops to saturated liquid temperature, into rectifying Tower bottom rectifying is separated into oxygen-enriched liquid air and nitrogen under tower；Nitrogen introduces condenser/evaporator as heat source, and nitrogen is condensed into liquid nitrogen, Tower under rectifying column is introduced after the throttling of liquid nitrogen a part, and, as phegma, another part is subcooled deutomerite stream through the first subcooler and enters essence Tower is evaporated on tower as phegma；Oxygen-enriched liquid air, which introduces, participates in rectifying in the middle part of tower on rectifying column；
Step 2: tower bottom liquid oxygen is further increased as condenser/evaporator cold source, liquid oxygen purity on rectifying column, purity is obtained 99.6% or more qualified liquid oxygen product, cooling box is transported to liquid oxygen vessel after the supercooling of the first subcooler；On rectifying column in tower It extracts dirty nitrogen cooling box after the first subcooler, First Heat Exchanger re-heat out and is vented in top；Top of tower pure nitrogen gas on rectifying column Extraction cooling box after the first subcooler, First Heat Exchanger re-heat, as pure nitrogen gas product supply to user；
Step 3: the liquid nitrogen that liquid nitrogen storage tank produces storage at night is supplied on rectifying column tower as phegma.
7. peak-trough electricity according to claim 6 produces liquid oxygen liquid nitrogen method, which is characterized in that part liquid nitrogen in liquid nitrogen storage tank Enter nitrogen supercharging machine after the second subcooler, the second heat exchanger re-heat, enter back into nitrogen circulation compressor, to utilize liquid nitrogen system Take pure nitrogen gas for nitrogen circulation compressor.
8. peak-trough electricity according to claim 6 produces liquid oxygen liquid nitrogen method, which is characterized in that liquid nitrogen vapor in liquid nitrogen storage tank Enter nitrogen supercharging machine after the second heat exchanger re-heat, enter back into nitrogen circulation compressor, to be steamed using liquid nitrogen in liquid nitrogen storage tank Vapour.
9. peak-trough electricity according to claim 6 produces liquid oxygen liquid nitrogen method, which is characterized in that after another part adherence pressure Pure nitrogen gas enter the second heat exchanger, the second exchanger base liquefy before extraction section pure nitrogen gas enter high-temperature expansion Machine, for adjusting high temperature expander temperature；Extraction section pure nitrogen gas enters cryogenic expansion machine, for adjusting cryogenic expansion machine temperature Degree.
CN201811363624.4A 2018-11-16 2018-11-16 A kind of peak-trough electricity production liquid oxygen liquid nitrogen plan and method Pending CN109341193A (en)

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CN108061428A (en) * 2018-01-12 2018-05-22 杭州特盈能源技术发展有限公司 A kind of purity nitrogen device for making and technique
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CN110160315B (en) * 2019-06-13 2024-04-12 兰文旭 Liquid air separation device utilizing low-cost night electric power and production method
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CN110319652A (en) * 2019-06-25 2019-10-11 杭州杭氧化医工程有限公司 A kind of air separation oxygenerator for energy storing-releasing
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CN113091401A (en) * 2021-04-29 2021-07-09 开封迪尔空分实业有限公司 Liquid air separation device for preparing liquid oxygen by using liquid nitrogen
CN113091401B (en) * 2021-04-29 2022-05-31 开封迪尔空分实业有限公司 Liquid air separation device for preparing liquid oxygen by using liquid nitrogen
CN114383384A (en) * 2021-12-30 2022-04-22 北京科技大学 Air liquefaction and cryogenic air separation process integration method
CN114383384B (en) * 2021-12-30 2022-09-16 北京科技大学 Air liquefaction and cryogenic air separation process integration method
CN114777416A (en) * 2022-04-22 2022-07-22 杭州特盈能源技术发展有限公司 Low-energy-consumption air separation energy storage process for efficient conversion of green electricity
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