EP1314941A2 - Procédé et dispositif pour la production d'azote à partir de l'air - Google Patents

Procédé et dispositif pour la production d'azote à partir de l'air Download PDF

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Publication number
EP1314941A2
EP1314941A2 EP02025985A EP02025985A EP1314941A2 EP 1314941 A2 EP1314941 A2 EP 1314941A2 EP 02025985 A EP02025985 A EP 02025985A EP 02025985 A EP02025985 A EP 02025985A EP 1314941 A2 EP1314941 A2 EP 1314941A2
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EP
European Patent Office
Prior art keywords
rectification column
rectification
nitrogen
product
air
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.)
Withdrawn
Application number
EP02025985A
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German (de)
English (en)
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EP1314941A3 (fr
Inventor
Joachim Dr. Krey
Thorsten Möller
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Air Liquide AGS GmbH
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Messer AGS GmbH
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Publication date
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Publication of EP1314941A2 publication Critical patent/EP1314941A2/fr
Publication of EP1314941A3 publication Critical patent/EP1314941A3/fr
Withdrawn legal-status Critical Current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
    • F25J3/044—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 single pressure main column system only
    • 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/0403—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of 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
    • 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04109—Arrangements of compressors and /or their drivers
    • F25J3/04145—Mechanically coupling of different compressors of the air fractionation process to the same driver(s)
    • 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
    • F25J3/04254—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using the cold stored in external cryogenic fluids
    • 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
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • 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
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04321—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of 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
    • 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
    • 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
    • F25J3/0489—Modularity and arrangement of parts of the air fractionation unit, in particular of the cold box, e.g. pre-fabrication, assembling and erection, dimensions, horizontal layout "plot"
    • 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/74—Refluxing the column with at least a part of the partially condensed overhead gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/76—Refluxing the column with condensed overhead gas being cycled in a quasi-closed loop 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/42—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
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/20—Integrated compressor and process expander; Gear box arrangement; Multiple compressors on a common shaft

Definitions

  • the invention relates to a method and a device for generating Nitrogen from air.
  • the pretreated air is then in a main heat exchanger in Countercurrent withdrawn from the rectification column and the condenser Product streams cooled to a temperature in the range of the dew point of the air.
  • a subset of the vaporous low oxygen overhead product of Rectification column is withdrawn as a nitrogen product.
  • the oxygen-enriched bottom liquid of the rectification column is called Cooling medium fed into the condenser of the rectification column and through in Countercurrent indirect heat exchange with the residual amount of evaporated vapor-poor oxygen-depleted overhead of the rectification column.
  • the condensed overhead product is returned to the rectification column as reflux fed.
  • the invention is therefore based on the object, a method and a To provide apparatus for the production of nitrogen from air, which allows a higher yield of nitrogen with reduced energy consumption.
  • the compressed and pre-cleaned air is in a main heat exchanger through in Countercurrent carried out indirect heat exchange with gaseous products the rectification column cooled to the dew point and in the range the rectification of the rectification column fed and in known Into an oxygen-rich bottoms liquid and an oxygen-poor one decomposed vaporous nitrogen product.
  • Nitrogen product is first in countercurrent with reflux liquid from the The bottom of the rectification column is preheated to the dew point of the air and then in the main heat exchanger by countercurrent indirect heat exchange with the compressed purified air and a compacted portion of the oxygen-depleted nitrogen product into the area the ambient temperature is heated.
  • the thus pretreated nitrogen product is at least one further pinion of the gear turbo compressor to a product pressure of over 6 bar, preferably to a pressure of 5 to 20 bar, compressed and a subset as gaseous low oxygen nitrogen product withdrawn from the process.
  • the amount of compressed nitrogen product not withdrawn from the process is in the main heat exchanger together with the pretreated air through in Countercurrent indirect heat exchange with the cold vaporous Products from the rectification column to a temperature in the dew point cooled from air and fed back into the bottom evaporator of the rectification column as well as by indirect heat exchange with evaporating sump liquid of the Liquefied rectification column.
  • the withdrawn from the bottom evaporator of the rectification column liquid nitrogen is characterized by countercurrent indirect heat exchange with vapor Undercooled nitrogen product of the rectification column, to the operating pressure of the Rectified column relaxed and directly as reflux liquid in the rectification column fed or initially relaxed in a storage container, from the then at least a subset of the liquid as reflux liquid in fed to the rectification column and optionally a further subset as liquid nitrogen product is withdrawn from the rectification.
  • the amount of flushing fluid required for the process is removed from the Withdrawn bottom liquid of the rectification column.
  • a subset of evaporated in the bottom evaporator of the rectification column Liquid is called a vaporous oxygen-rich nitrogen product with a Oxygen content of 35 to 80% deducted from the rectification column, then in the main heat exchanger warmed by about 10 to 60 Kelvin and to cover the Refrigeration needs of the rectification in a work-performing expansion device (Expansion turbine) to a pressure of about 1.3 bar relaxed.
  • the relaxed oxygen-rich product stream is through in the main heat exchanger indirect heat exchange with the compressed and purified air and the densified nitrogen to the temperature range of the environment Rectification warmed up and at least partially for the regeneration of the Air purification device used.
  • the withdrawn from the rectification column vapor oxygen-rich nitrogen product also without work-free relaxation directly in the Main heat exchanger by indirect heat exchange with the compacted and cleaned air and, if necessary, also compressed separately from the air nitrogen warmed the temperature range of the environment and the refrigeration demand of the plant by feeding a liquid consisting of oxygen, nitrogen and argon Mixture, but preferably by feeding liquid nitrogen into the Rectification column are covered.
  • the advantage of the inventive production of nitrogen from air is in particular, that even when using only one compressor, the operating pressure the rectification column is usually more than half below the desired one Pressure of the nitrogen product is.
  • a second significant advantage of the method according to the invention over the The conventional method described above is that below the feed point of the air into the rectification column steam quantities in the Magnitude produced by more than one third of the amount of air used be a further separation of the flowing down from the feed point Allow return fluid. In the withdrawn from the rectification column oxygen-rich product is thus significantly less nitrogen than at conventional plants.
  • the low operating pressure of the rectification column allows a much more effective separation than the conventional method, so depending on desired nitrogen pressure and quantity energy savings between about 10 Percent to over 30% percent to realize.
  • the operating pressure of the rectification column chosen be that the liquid evaporating in the bottom of the rectification column about 1.5 to 3 Kelvin is colder than the dew point of the nitrogen at the desired Product pressure.
  • the coldbox can be used to determine the cooling requirements of the process. Is this Refrigeration demand under the maximum achievable during work relaxation Cooling capacity so there is a cold overflow and it can be liquid nitrogen as additional product be deducted.
  • the applications of the subject invention are of the respective thermodynamic and aerodynamic process conditions on the Gear turbo compressor determines.
  • Nitrogen yield increases the effectiveness of the separation in the rectification column and reduces the use of air.
  • the subject invention further relates to a device consisting of at least one transmission turbo compressor having at least two pinions, at least one air cleaning device, at least one heat exchanger and at least one with conventional rectification equipment and a Bottomed evaporator equipped rectification column and at least one subcooler, by means of a conventional measuring, control and regulating and conveying devices exhibiting piping system are interconnected.
  • the device consists of at least one gear turbo compressor having at least two pinions, at least one air cleaning device, at least one with a Expansion turbine coupled heat exchanger, one with conventional Rectifying and a bottom evaporator equipped with and at least one separating vessel coupled rectification column and at least a subcooler, through a standard measuring, control and regulating and Conveyors exhibiting piping system are interconnected.
  • the advantage of the inventive production of nitrogen from air is in particular, that when using only one compressor, the rectification column with can be operated at a pressure of usually less than half of the desired pressure of the nitrogen product.
  • Fig. 1 to be rectified air 1 on a first pinion 2a of Transmission turbo compressor 2 in two stages 2b, 2c on one to operate a Bottom evaporator (7) of a rectification column (6) compressed appropriate pressure and then in a device 3, usually by cooling and adsorption of cleaned their interfering ingredients.
  • the compressed and purified air 4 is in a heat exchanger 5 through indirect heat exchange in countercurrent with a rectification column 6 supplied cold, vapor product streams 9b, 12 into the range of Dew point cooled by air.
  • the thus pretreated air 4a is in the region of the rectification units 6a, 6b fed into the rectification column 6 and in this in an oxygen-poor vaporous nitrogen product 9 and an oxygen-rich bottoms liquid 17 disassembled.
  • Nitrogen product 9c is deposited on at least one further pinion 2d of the Transmission turbo-compressor 2 to the desired product pressure of the oxygen-poor Nitrogen product 10 and partially compressed as a gaseous nitrogen product 10a deducted from the rectification.
  • the partial amount 10b of the oxygen-poor, which is not withdrawn from the rectification Nitrogen product 10 is in the heat exchanger 5 for heating air, together with the compressed, pre-cleaned air 4, in countercurrent with the cold vaporous nitrogen products 9b, 12 of the rectification column 6 to within the range the dew point of the air cooled.
  • the compressed and cooled portion 10c of the nitrogen product is the Bottom evaporator 7 of the rectification column 6 and fed by indirect Heat exchange with the thereby evaporating bottom liquid 17 of the rectification column 6 liquefied.
  • the liquid nitrogen 11 produced in the manner described above is extracted from the Withdrawn rectification column 6 and in the subcooler 8 in countercurrent with the supercooled nitrogenous product 9 of the rectification column 6, in a throttle 13 relaxed to the operating pressure of the rectification column 6 and as return 11 a before Head fed to the rectification column 6.
  • Part of the liquid 17 evaporated in the bottom evaporator 7 of the rectification column 6 is as a vaporous oxygen-rich product 12 from the rectification column. 6 withdrawn and in the heat exchanger 5 together with the preheated Nitrogen product 9b of the rectification column 6 in countercurrent with the compacted, purified air 4 and the recompressed partial flow of the oxygen-poor Nitrogen product 10b warmed.
  • At least the rectification column 6, the bottom evaporator 7 of the rectification column 6 and those equipped with conventional measurement and control technology Lines connected to the rectification column 6, for indirect heat exchange used devices 5, 8 are in a heat-insulating cold box 18th arranged.
  • the compressed and purified air 4 is in the heat exchanger 5 by indirect Heat exchange in countercurrent with the withdrawn from the rectification column 6 gaseous product streams 9b, 12 and one from the product stream 12th cooled product stream 12d cooled to the dew point of air and as air 4a into the region of the rectification units 6a, 6b of the rectification column 6 fed.
  • air 4a is by means of conventional Rectification the low-oxygen vaporous nitrogen product 9 and the oxygen-rich bottoms liquid 17 produced.
  • oxygen-poor vaporous nitrogen product 9 is in the separation vessel 16 with a generated during the relaxation 13 of the return 11 Relaxation steam mixed and then in the subcooler 8 im Countercurrent with that generated in the bottom evaporator 7 of the rectification column 6 Return liquid 11 preheated to the dew point of the air 4a.
  • the thus preheated oxygen-poor vaporous nitrogen product 9b is used in the Means 5 in countercurrent with the compressed and purified air 4 and the post-compressed partial stream 10b of the withdrawn from the rectification column 6 low oxygen nitrogen product 9 at about ambient temperature Warmed up rectification.
  • Nitrogen product 9c is deposited on at least one pinion 2d of the Transmission turbo-compressor 2 to the desired pressure of the nitrogen product compacted.
  • a subset of the post-compressed nitrogen product 10 of the rectification column 6 is withdrawn as a gaseous product 10a from the rectification.
  • the partial amount 10b not withdrawn from the rectification as nitrogen product 10a is in the heat exchanger 5 - together with the compressed, pre-cleaned air. 4 - In countercurrent with the cold vaporous products 9b, 12, 12d of Rectifying column 6 cooled to the range of the dew point of the air 4a.
  • the compressed and cooled portion of the nitrogen product 10c is the Bottom evaporator 7 of the rectification column 6 and fed in the bottom evaporator. 7 by indirect heat exchange with the vaporizing bottom liquid 17 of the Rektifizier Textle 6 liquefied.
  • liquid nitrogen 11 is withdrawn from the bottom evaporator 7 and in the subcooler 8 in countercurrent is supercooled with the vaporous nitrogen product 9a of the rectification column 6, in the Throttle device 13 relaxed to the pressure level of the rectification column and the Deposition container 16 supplied.
  • Liquid 17 is as a vaporous oxygen-rich product 12 from the Withdrawn rectification column 6 and in the heat exchanger 5 in countercurrent with the compressed, purified air 4 and the recompressed partial flow of oxygen-poor nitrogen product 10b by 10 to 60 K warmed.
  • the oxygen-rich product 12c pretreated as described above becomes performing work in an expansion turbine 15 to a pressure level which is about 200 up to 500 mbar above ambient pressure, relaxed and oxygen-rich Product 12d in the heat exchanger 5 in countercurrent with the compressed, purified air 4 and the post-compressed partial flow of the nitrogen product 10b warmed up to the ambient temperature range.
  • Nitrogen 14 is withdrawn from the separation tank 16.

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EP02025985A 2001-11-23 2002-11-21 Procédé et dispositif pour la production d'azote à partir de l'air Withdrawn EP1314941A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10157544 2001-11-23
DE10157544A DE10157544A1 (de) 2001-11-23 2001-11-23 Verfahren und Vorrichtung zur Erzeugung von Stickstoff aus Luft

Publications (2)

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EP1314941A2 true EP1314941A2 (fr) 2003-05-28
EP1314941A3 EP1314941A3 (fr) 2003-08-27

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EP02025985A Withdrawn EP1314941A3 (fr) 2001-11-23 2002-11-21 Procédé et dispositif pour la production d'azote à partir de l'air

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EP (1) EP1314941A3 (fr)
DE (1) DE10157544A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111928576A (zh) * 2020-08-14 2020-11-13 淄博盈德气体有限公司 一种控制进气量的空分塔
WO2021204418A1 (fr) * 2020-04-09 2021-10-14 Linde Gmbh Procédé de production d'un produit d'azote gazeux et liquide au moyen d'une séparation à basse température de l'air, et système de séparation d'air
WO2022179748A1 (fr) * 2021-02-25 2022-09-01 Linde Gmbh Procédé et installation pour fournir de l'azote comprimé

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX2021004432A (es) 2018-10-16 2021-07-06 Transitions Optical Ltd Aparato de curado ultravioleta.

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Publication number Priority date Publication date Assignee Title
DE1199293B (de) * 1963-03-29 1965-08-26 Linde Eismasch Ag Verfahren und Vorrichtung zur Luftzerlegung in einem Einsaeulenrektifikator
FR2060184B1 (fr) * 1969-09-10 1973-11-16 Air Liquide
GB1392294A (en) * 1971-06-28 1975-04-30 British Oxygen Co Ltd Air separation
IT1034544B (it) * 1975-03-26 1979-10-10 Siad Procedimento ed impianto per il frazionamento dell aria con colon na a semplice rettifica
US4662917A (en) * 1986-05-30 1987-05-05 Air Products And Chemicals, Inc. Process for the separation of air
DE4030750A1 (de) * 1990-09-28 1992-04-02 Linde Ag Verfahren und vorrichtung zur tieftemperaturzerlegung von luft
JPH03230079A (ja) * 1990-11-22 1991-10-14 Teisan Kk 窒素ガス製造方法
FR2697325B1 (fr) * 1992-10-27 1994-12-23 Air Liquide Procédé et installation de production d'azote et d'oxygène.
DE10013074A1 (de) * 2000-03-17 2001-09-20 Linde Ag Verfahren zur Gewinnung von gasförmigem Stickstoff
US6393865B1 (en) * 2000-09-27 2002-05-28 Air Products And Chemicals, Inc. Combined service main air/product compressor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021204418A1 (fr) * 2020-04-09 2021-10-14 Linde Gmbh Procédé de production d'un produit d'azote gazeux et liquide au moyen d'une séparation à basse température de l'air, et système de séparation d'air
CN111928576A (zh) * 2020-08-14 2020-11-13 淄博盈德气体有限公司 一种控制进气量的空分塔
WO2022179748A1 (fr) * 2021-02-25 2022-09-01 Linde Gmbh Procédé et installation pour fournir de l'azote comprimé

Also Published As

Publication number Publication date
EP1314941A3 (fr) 2003-08-27
DE10157544A1 (de) 2003-06-12

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