US20160356547A1 - Method and plant for the cryogenic separation of air - Google Patents

Method and plant for the cryogenic separation of air Download PDF

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Publication number
US20160356547A1
US20160356547A1 US15/157,473 US201615157473A US2016356547A1 US 20160356547 A1 US20160356547 A1 US 20160356547A1 US 201615157473 A US201615157473 A US 201615157473A US 2016356547 A1 US2016356547 A1 US 2016356547A1
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pressure level
air
air quantity
turbo
bar
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Dimitri Goloubev
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Linde GmbH
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Linde GmbH
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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
    • F25J3/04406—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
    • F25J3/04006—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
    • F25J3/04012—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
    • F25J3/04024—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 purified feed air, so-called boosted 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
    • F25J3/04036—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 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
    • F25J3/04006—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
    • F25J3/04042—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 argon or argon enriched 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
    • 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
    • F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
    • F25J3/04054—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of 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
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/04084—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression 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
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression 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
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04175—Hot end purification of the feed air by adsorption of the impurities at a pressure of substantially more than the highest 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
    • F25J3/04248—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
    • F25J3/0429—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 feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04296—Claude expansion, i.e. expanded into the main or 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
    • F25J3/04248—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.
    • F25J3/04381—Details relating to the work expansion, e.g. process parameter etc. using work extraction by mechanical coupling of compression and expansion so-called companders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/02—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream
    • F25J2240/04—Multiple expansion turbines in parallel

Definitions

  • the invention relates to a method and to a plant for the cryogenic separation of air by the distillative cryogenic separation of feed air in a distillation column system of an air separation plant at different distillation pressures, wherein all of the feed air in a total air quantity is compressed to a first pressure level that is at least 4 to 5 bar above the highest of the distillation pressures, and from the total air quantity
  • Air separation plants have distillation column systems which can for example take the form of two-column systems, in particular conventional Linde two-column systems, but also three- or multi-column systems.
  • distillation columns for the production of nitrogen and/or oxygen in liquid and/or gaseous form for example liquid oxygen, LOX, gaseous oxygen, GOX, liquid nitrogen, LIN and/or gaseous nitrogen, GAN
  • nitrogen-oxygen separation it is also possible to provide distillation columns for the production of other air components, in particular the noble gases krypton, xenon and/or argon.
  • the distillation column systems of air separation plants are run with various operating pressures in their distillation columns.
  • Known two-column systems have, for example, a so-called (high-)pressure column and a so-called low-pressure column.
  • the operating pressure of the high-pressure column is for example 4.3 to 6.9 bar, in particular approximately 5.5 bar.
  • the low-pressure column is run at an operating pressure of for example 1.2 to 1.7 bar, in particular approximately 1.4 bar.
  • the pressures indicated here are absolute pressures at the bottom of corresponding distillation columns.
  • the specified pressures are referred to hereinbelow also as “distillation pressures” because it is at those pressures that the fractional distillation of the air fed in each case takes place within the distillation columns. This does not exclude the possibility of other pressures also prevailing at other points in a distillation column system.
  • Cooled compressed air which has been pressurized by means of various compressors or combinations of various compressors (for example main air compressors and booster air compressors), is fed into the distillation column systems.
  • Products obtained in a corresponding air separation plant can also be pressurized with compressors (product compressors) or corresponding combinations of compressors.
  • the operating costs (OPEX) of an air separation plant are determined essentially by the energy consumption which in turn is primarily dependent on the energy consumption of the compressors (main air compressor, booster air compressor and product compressor if present).
  • the investment costs (CAPEX) are also determined essentially by the costs to be borne for the provision of the compressors.
  • MAC main air compressor
  • BAC booster air compressor
  • HAP high air pressure
  • U.S. Pat. No. 5,901,579 A shows a turbo compressor and turbo expander coupled via a gearing for use in an HAP method.
  • EP 2 634 517 A1 and EP 2 520 886 A1 disclose arrangements which use so-called cold compressors or cold boosters (see below).
  • the term “evaporate” in the context of internal compression includes cases in which a supercritical pressure prevails and thus no phase transition proper takes place.
  • the stream pressurized in liquid form is then “pseudo-evaporated”.
  • a heat transfer medium is liquefied (or pseudo-liquefied if it is at supercritical pressure).
  • the heat transfer medium commonly consists of a part stream of the compressed feed air, which is termed throttle stream.
  • additional evaporation heat can be supplied by the so-called turbine stream (or by multiple turbine streams).
  • this heat transfer medium In order to be able to efficiently heat and evaporate the stream pressurized in liquid form, this heat transfer medium must, due to thermodynamic conditions, be at a relatively high pressure. For that reason, a correspondingly highly-compressed stream must be provided. This is especially the case if, for example, internally compressed oxygen at high or very high pressures (for example 50 bar or more) is to be provided for use in the above-mentioned CTX methods or in gasification of heavy oil, but also in other scenarios.
  • internally compressed oxygen at high or very high pressures for example 50 bar or more
  • the present invention therefore has the object of providing possibilities which allow, in an HAP method, a corresponding compression to be effected in a simple and efficient manner.
  • the present invention proposes a method and a plant for the cryogenic separation of air, by the distillative cryogenic separation of feed air in a distillation column system of an air separation plant at different distillation pressures, wherein all of the feed air in a total air quantity is compressed to a first pressure level that is at least 4 to 5 bar above the highest of the distillation pressures, and from the total air quantity
  • turbo compressors are used to compress the air. This is the case for example for the “main (air) compressor” which is distinguished in that it compresses all of the quantity of air fed into the air separation plant, that is to say all of the “feed air”.
  • turbo compressors For the (subsequent) compression of part air quantities, provision is typically made of further turbo compressors which are also termed boosters.
  • turbo expanders can also be coupled to turbo compressors (boosters) and drive these.
  • turbo compressors boosts
  • turbine booster In the case of one or more turbo compressors being driven without externally supplied energy, i.e. only by one or more turbo expanders, the term “turbine booster” is also used for such an arrangement.
  • turbo compressors and turbo expanders The mechanical construction of turbo compressors and turbo expanders will in principle be known to a person skilled in the art.
  • a turbo compressor the air is compressed by means of rotor blades which are arranged on an impeller wheel or directly on a shaft.
  • a turbo compressor forms a structural unit which can however have multiple “compressor stages”.
  • a compressor stage generally comprises an impeller wheel or a corresponding arrangement of rotor blades. All of these compressor stages can be driven by a common shaft.
  • a turbo expander is fundamentally of comparable design, the rotor blades being however driven by the expanding air.
  • multiple expansion stages can be provided.
  • Turbo compressors and turbo expanders can be designed as radial- or axial-flow machines.
  • the rotor blades of a turbo compressor or turbo expander are “rotationally fixedly coupled” to another element, for example a driving wheel or driven wheel, this means that there is a mechanical connection between the rotor blades and the other element.
  • the rotor blades are attached to one or more impeller wheels which is/are rotationally fixedly connected to a shaft, or are directly attached to a shaft, thus permitting a direct transfer of torque between the shaft and the rotor blades.
  • each element that is rotationally fixedly coupled to the shaft is also rotationally fixedly coupled to the rotor blades.
  • a “driving wheel” is to be understood as a gear wheel to which a shaft imparts a torque, in particular by said gear wheel being coupled to the rotor blades of a turbo expander.
  • a “driven wheel”, by contrast, is a gear wheel which in turn imparts a torque to a shaft, in particular the shaft of a turbo compressor.
  • pressure level and “temperature level” to characterize pressures and temperatures, these being intended to express that corresponding pressures and temperatures need not be used in the form of exact pressure or temperature values in order to realize the inventive concept.
  • pressures and temperatures typically move within certain ranges which lie for example ⁇ 1%, 5%, 10%, 20% or even 50% about a central value.
  • corresponding pressure levels and temperature levels can lie in disjoint ranges or in overlapping ranges.
  • pressure levels for example include unavoidable or expected pressure losses. The same holds for temperature levels.
  • the pressure levels indicated here in bar are absolute pressures.
  • a relatively high-pressure air stream is required, as mentioned in the introduction.
  • This pressure is once again substantially higher than the already-high pressure, in HAP methods, of the total compressed air and is typically generated by means of so-called cold boosters.
  • a cold booster is understood as a turbo compressor which is supplied with low-temperature air, typically below 0° C. It is advantageously driven by means of a turbo expander.
  • Single-stage compression of this stream which is also termed throttle stream, is shown in the appended FIG. 1 merely as a hypothetical example by way of illustration.
  • Single-stage compression is not sufficient to achieve the required pressures, since the pressure ratio that can be achieved in the cold booster is limited (the pressure ratio ⁇ in corresponding turbo compressors is generally no higher than 1.8 to 2.0).
  • the mass flow of the air stream which is correspondingly to be highly compressed in an energy-optimized configuration, a second air stream at a lower pressure level is used) is much lower than the mass flow of the air which is expanded in a turbo expander which can be used for driving. This would lead to large differences in specific rotational speeds, and hence a corresponding unit cannot currently be built.
  • turbo expanders in the case of an HAP method, the total gaseous air for rectification is expanded via corresponding turbo expanders, such that it is recommended to use these to compress the throttle stream, i.e. without external electrical energy.
  • FIG. 2 Another arrangement is shown in FIG. 2 and explained below, also merely for illustrative purposes.
  • a corresponding arrangement has hitherto not been considered in the cold part of a corresponding plant, such an arrangement is known per se and has already been used in “hot” turbine boosters, although the volume flows there are very different.
  • the conditions of the volume flows in particular in the case of the second cold booster where a final pressure of approximately 57 bar (at a pressure similar to that of the internally compressed oxygen) is generated, would however remain too unequal, with the result that such a unit can also currently not be built due to excessive differences in specific rotational speeds.
  • the present invention was based on the search for an arrangement by means of which two-stage compression of the throttle stream at optimum quantity ratios is possible using a turbine drive.
  • the present invention proposes a method for the distillative cryogenic separation of feed air in a distillation column system of an air separation plant at different distillation pressures.
  • all of the feed air in a total air quantity is compressed to a first pressure level that is at least 4 to 5 bar above the highest of the distillation pressures.
  • the highest of the operating pressures in a corresponding distillation column system i.e. the operating pressure in the (high-)pressure column
  • a first part air quantity is first cooled to a first temperature level of 130 to 170 K, typically in a main heat exchanger of a corresponding air separation plant, and then compressed to a second pressure level that is at least 10 bar above the first pressure level.
  • the present invention is therefore used in HAP methods in which relatively high pressures are generated, for example, as explained below, in order to be able to provide internally compressed pressurized products at correspondingly high pressures.
  • a second part air quantity is first cooled to a second temperature level of 110 to 150 K and then expanded to a third pressure level that is below the first pressure level, and can for example be at the highest of the distillation pressures, that is to say the operating pressure of the high-pressure column.
  • the cooling to the second temperature level can also take place in a main heat exchanger of the air separation plant.
  • the simultaneous compression and expansion of corresponding part air quantities gives rise to problems in particular if, in this context, the compression is to be carried out using work released during expansion, i.e. if it is to be performed without the supply of external (electrical) energy.
  • the first and the second part air quantity differ markedly because, as mentioned, this leads to marked differences in rotational speed.
  • the present invention provides using a compression/expansion arrangement with a gearing, in which a driving wheel engages with a gear wheel and the gear wheel engages with a driven wheel.
  • the rotor blades of two or more turbo expanders are coupled to the driving wheel and the rotor blades of two or more turbo compressors are coupled to the driven wheel, in both cases rotationally fixedly within the meaning explained above.
  • the first part air quantity is fed, for compression to the second pressure level, in series through the turbo compressors and the second part air quantity is fed, for expansion to the third pressure level, in parallel through the turbo expanders.
  • “Parallel” feeding through multiple turbo expanders is understood, in that context, as meaning that the second part air quantity is split into two or more part streams and each of the part streams is fed through one of the turbo expanders.
  • the above-mentioned problem can be solved by using the compression/expansion arrangement in that the gearing used makes it possible to match the rotational speeds of the respective turbo compressors and turbo expanders used.
  • Using multiple turbo compressors in series makes it possible to generate very high pressure differences which could not be achieved with just one compressor unit.
  • the invention also permits the use of first and second part air quantities in markedly different orders of magnitude since the use of the gearing makes it possible to compensate for differences in rotational speed.
  • the first part air quantity fed through the turbo compressors is at the above-mentioned first temperature level. For that reason, the turbo compressors are operated as cold boosters.
  • turbo expanders By virtue of the fact that, within the context of the present invention, multiple turbo expanders are connected in parallel, the mechanical loads which arise can be spread symmetrically across these and the individual turbo expanders can be made smaller and more cost-effective.
  • Particular advantages result when use is made of two turbo compressors of which the rotor blades are respectively coupled to a first shaft coupled to the driven wheel, on either side of the driven wheel. This makes it possible to reduce asymmetric loads and to reduce wear.
  • a torque transmitted by means of the driving wheel to the gear wheel is greater than or equal to a torque transmitted by means of the gear wheel to the driven wheel.
  • gear wheel makes it possible for other driving or driven gear wheels to be brought into engagement flexibly, and thus the method can be expanded as desired. It is for example possible, in this manner, to use one or more further turbo expanders driving via a driving wheel and/or one or more turbo compressors driven by the turbine wheel via a driven wheel.
  • the gear wheel itself is preferably not rotationally fixedly coupled to turbo expanders and/or turbo compressors, but rather preferably merely transmits torques between driving and driven wheels.
  • the gear wheel on one hand and the driving or driven units on the other are run at different rotational speeds.
  • this does not exclude the possibility of the driving and/or driven units being run at the same rotational speed as one another.
  • the first pressure level is 10 to 17 bar, in particular 13 to 16 bar
  • the second pressure level is 40 to 70 bar, in particular 50 to 60 bar.
  • the second pressure level is at relatively high values which preclude the use of a single booster since, as mentioned, the pressure difference that can be achieved therein is too small. This problem is solved with the use in series of multiple turbo compressors which, according to the invention, are coupled by means of a gearing.
  • the third pressure level which is below the first pressure level can for example be at the highest of the distillation pressures in the distillation column arrangement, for example the pressure level at which a high-pressure column is run.
  • the statement that the third pressure level is “at” the highest of the distillation pressures is intended to mean that the third pressure level deviates by no more than 1 bar from the highest of the distillation pressures in the distillation column arrangement.
  • the present invention is particularly well-suited if the respective part air quantities differ markedly from one another. This is in particular the case if the first part air quantity corresponds to 0.2 to 0.6 times the second part air quantity, and/or if the first and second part air quantities together correspond to 0.3 to 0.6 times the total air quantity.
  • the stated ratios relate, respectively, to normal volume per unit of time, that is to say normal volume flow rates, for example normal cubic metres per hour (Nm 3 /h).
  • normal volume flow rates for example normal cubic metres per hour (Nm 3 /h).
  • the differences in the volume flow rates actually present prove to be much higher since the pressures which are present differ markedly.
  • the method of the present invention is well-suited due to the use of the specified gearing.
  • the second part air quantity is compressed, prior to cooling to the second temperature level, from the first pressure level to an intermediate pressure level below the second pressure level.
  • another turbo compressor can be used, for example.
  • This can be driven by a turbo expander (which is present for the purpose of providing the refrigeration power necessary for the process as a whole) which expands another stream.
  • the method according to the invention provides particular advantages if a liquid, oxygen-rich air product is extracted from the distillation column system, is pressurized in liquid form and is then converted, by heating, from the liquid to the supercritical or gaseous state, that is to say for internal compression methods.
  • internal compression methods it is possible, within the context of the present invention, for the liquid, oxygen-rich air product to be pressurized in liquid form to the first pressure level or another high pressure level.
  • the invention is thus particularly well-suited to methods in which corresponding internal compression products are to be provided at high pressures.
  • the air compressors are typically driven by steam turbines.
  • the steam turbines used in this context are typically two-shaft turbines which are set up to simultaneously drive the main and booster air compressors (MAC and BAC in MAC/BAC methods) by means of respectively one of the shafts.
  • MAC and BAC main and booster air compressors
  • MAC/BAC main and booster air compressors
  • HAP methods are particularly advantageous because here the product compressor can be driven directly via one of the shafts of the steam turbine (the booster air compressor is omitted). Plants of this type therefore benefit particularly from solutions which require no electrical drives.
  • the present invention further relates to an air separation plant which is set up for the distillative cryogenic separation of feed air in a distillation column system at different distillation pressures.
  • This plant has means which are set up to compress all of the feed air in a total air quantity to a first pressure level that is at least 4 to 5 bar above the highest of the distillation pressures, from the total air quantity to first cool a first part air quantity to a first temperature level of 130 to 170 K and then to compress this to a second pressure level that is at least 10 bar above the first pressure level, and to first cool a second part air quantity to a second temperature level of 110 to 150 K and then to expand this to a third pressure level that is below the first pressure level.
  • the plant is characterized by a compression/expansion arrangement with a gearing, in which, according to the invention, a driving wheel engages with a gear wheel and the gear wheel engages with a driven wheel.
  • the rotor blades of two or more turbo expanders are coupled to the driving wheel and the rotor blades of two or more turbo compressors are coupled to the driven wheel.
  • the present invention is particularly well-suited to air separation plants in which the compression/expansion arrangement comprises two turbo compressors of which the rotor blades are coupled to a first shaft coupled to the driven wheel, on either side of the driven wheel, and/or two turbo expanders of which the rotor blades are coupled to a second shaft coupled to the driving wheel, on either side of the driving wheel. It is thus possible, as already explained, to reduce asymmetric loads.
  • An arrangement “on either side” is intended to mean here, as above, that the driving or driven wheel is arranged on a shaft which extends axially on either side of the driving or driven wheel.
  • a corresponding turbo compressor or turbo expander, or the rotor blades thereof, can be arranged on each of the two sides.
  • FIG. 1 illustrates, by way of illustration of the problem upon which the invention is based, an air separation plant in the form of a schematic process flow diagram.
  • FIG. 2 illustrates, by way of illustration of the problem upon which the invention is based, an air separation plant in the form of a schematic process flow diagram.
  • FIG. 3 schematically illustrates a compression/expansion arrangement according to one embodiment of the invention.
  • FIG. 4 schematically illustrates a compression/expansion arrangement not according to the invention.
  • FIG. 1 illustrates, by way of illustration of the problem upon which the invention is based, an air separation plant in the form of a schematic process flow diagram, labelled 100 as a whole.
  • a compressed air stream a provided in this manner is pre-cooled in a direct contact cooler 3 which is supplied, inter alia, with a cooled water stream b from an evaporative cooler 4 .
  • the operation of the direct contact cooler 3 and of the evaporative cooler 4 will not be described further.
  • a correspondingly cooled compressed air stream, now labelled c is fed to an adsorber set 5 which, in the example shown, comprises two adsorber containers which are filled with a suitable adsorption material and are operated in alternation, and the operation of which will also not be described further.
  • a compressed air stream which has been dried in the absorber set 5 is labelled d. In the example shown, this is split into two part streams e and f.
  • the part stream e is then split again into two part streams g and h and is fed to the hot side of a main heat exchanger 7 .
  • the part stream g is the above-described turbine stream, and the part stream h is a (second) throttle stream at lower pressure.
  • the part stream f is further compressed in a booster turbine 8 , is cooled in an intercooler (which is not separately designated), is split again into two part streams i and k, and is fed to the hot side of the main heat exchanger 7 .
  • the part stream i is a (first) throttle stream which is at higher pressure and is to be boosted, and the part stream k is a stream which is to be expanded in order to provide refrigeration power.
  • all of the part streams e to k each comprise part air quantities of the total air quantity of the stream a, c and, respectively, d.
  • the part air quantity in stream i for example approximately 102,000 Nm 3 /h, is here termed the “first” part air quantity
  • the part air quantity in stream g for example approximately 307,000 Nm 3 /h
  • the part air quantity, of the total air quantity, in stream h is for example approximately 55,000 Nm 3 /h.
  • the division is discretionary and can also be implemented in a different sequence, deviating from the specific example.
  • the air separation plant shown in FIG. 1 is set up for the provision of internally compressed oxygen at a high pressure level, for example at approximately 57 bar, and at a rate of approximately 135,000 Nm 3 /h, for example.
  • a liquid, oxygen-rich stream l is extracted from the distillation column system 10 , is pressurized by means of a pump 9 and is converted in the main heat exchanger 7 from the liquid state to the supercritical state at the above-mentioned pressure.
  • This heat transfer medium is in this case formed by the part stream i, which to that end must be further compressed.
  • the part stream i after extraction from the main heat exchanger 7 at the first intermediate temperature level, would have to be compressed by means of the booster turbine 101 from the pressure level achieved in the booster turbine 8 , for example approximately 17 bar, to a pressure level of for example approximately 57 bar.
  • a corresponding pressure level is here termed “second” pressure level.
  • the part stream i is fed to the main heat exchanger 7 at an intermediate temperature level, and is extracted therefrom at the cold side.
  • the part streams h and i are expanded downstream of the main heat exchanger 7 to a lower pressure level, for example the pressure level of a pressure column in the distillation column arrangement 10 , of approximately 5.2 bar.
  • a pressure level for example the pressure level of a pressure column in the distillation column arrangement 10 , of approximately 5.2 bar.
  • a pressure level for example the pressure level of a pressure column in the distillation column arrangement 10 , of approximately 5.2 bar.
  • a pressure level for example the pressure level of a pressure column in the distillation column arrangement 10 , of approximately 5.2 bar.
  • a pressure level for example of valves or so-called dense liquid expanders which are shown in FIG. 1 but not separately designated. Expansion to such a pressure level can also take place for part streams g and k in the respective expansion turbines of the booster turbines 8 or, respectively, 101 .
  • the part streams g to k are fed into the distillation column system 10 , which has been mentioned many times, is shown here in highly schematic form and at reduced scale and typically comprises multiple distillation columns run at different operating pressures.
  • the illustrated example shows a high-pressure column 11 and a low-pressure column 12 which are connected such that they exchange heat via a main condenser 13 .
  • the high-pressure column 11 is for example run at the pressure level to which the streams g to k are expanded.
  • the streams g to k are typically fed into the high-pressure column 11 , although they might also be fed in part into the low-pressure column 12 .
  • the connections of the high-pressure column 11 and of the low-pressure column 12 are not shown in detail, nor are additional columns, valves, pumps, heat exchangers and the like.
  • the distillation column system 10 can comprise any number of corresponding columns and can be set up for the production of various air products.
  • a nitrogen-rich, liquid stream m which can also be pressurized by means of a pump (no reference sign) and converted in the main heat exchanger 7 to the gaseous or supercritical state.
  • Other nitrogen-rich streams n and o can for example be extracted from the distillation column system 10 in gaseous form from the high-pressure column 11 , heated in the main heat exchanger 7 and used as gaseous nitrogen product (GAN) or seal gas for pumps.
  • GAN gaseous nitrogen product
  • the stream d which can also be partially vented to the atmosphere, has already been mentioned.
  • FIG. 2 illustrates, by way of illustration of the problem upon which the invention is based, an air separation plant in the form of a schematic process flow diagram, labelled 200 as a whole.
  • the air separation plant 200 which is illustrated in FIG. 2 , and which incidentally corresponds to the air separation plant 100 illustrated in FIG. 1 , serves to explain that even using serial boosters or parallel turbo expanders does not on its own solve the problems explained above, or is technically impossible.
  • the part stream i would be compressed, in the boosters of two booster turbines 201 and 202 , via an intermediate pressure level of, for example, approximately 31 bar to the second pressure level, defined above, of approximately 57 bar, for example.
  • the part stream i can be cooled, for example in the main heat exchanger 7 , after exiting from the boosters of the booster turbine 201 and prior to entry into the boosters of the booster turbine 202 , such that its inlet temperature, on entering the boosters of the booster turbines 201 and 202 , is the same or similar.
  • the part stream g would be split into two part streams and expanded in the turbo expanders assigned to the booster turbines 201 and 202 .
  • the turbo expanders would each have to process only half of the “second” part air quantity of the stream g, thus in the example shown for example approximately 153,000 Nm 3 /h each. Even so, the volume flow through the booster of the booster turbine 202 would still be too small for the volume flow through the corresponding turbo expander, and thus the specific rotational speeds are too different, such that this solution is also impossible.
  • FIG. 3 schematically illustrates a compression/expansion arrangement according to one embodiment of the invention, labelled 30 as a whole.
  • the compression/expansion arrangement 30 can be tied into an air separation plant 100 or 200 according to FIGS. 1 and 2 instead of the booster turbine 101 or the booster turbines 201 and 202 .
  • This tying-in results from the corresponding designation of the part streams g and i. These are respectively the streams g and i downstream of the main heat exchanger 7 .
  • the second part air quantity of the total air quantity is split, in the form of the part stream g, into two part streams and is expanded in parallel in two turbo expanders 33 and 34 , as specified to for example approximately 5.2 bar.
  • the turbo compressors 31 and 32 and the turbo expanders 33 and 34 are respectively connected to one another via shafts 35 and 36 .
  • a driven wheel 37 is attached to the shaft 35 of the turbo compressors 31 and 32
  • a driving wheel 38 is attached to the shaft 36 of the turbo expanders 33 and 34 .
  • a gear wheel 39 engages with both the driven wheel 37 and the driving wheel 38 .
  • a torque imparted to the shaft 36 by the parallel expansion of the part streams of the stream g in the turbo expanders 33 and 34 can be transmitted via the driving wheel 38 to the gear wheel 39 and thence via the driven wheel 37 into the shaft 35 .
  • the driving wheel 38 , the gear wheel 39 and the driven wheel 37 it is possible to ensure that the, as explained, very different volume flows in the turbo expanders 31 and 32 on one hand and in the turbo compressors 33 and 34 on the other hand can be overcome without any problem.
  • FIG. 4 schematically illustrates a compression/expansion arrangement not according to the invention, labelled 40 as a whole.
  • the compression/expansion arrangement 40 can also be tied into an air separation plant 100 or 200 according to FIGS. 1 and 2 instead of the booster turbine 101 or the booster turbines 201 and 202 .
  • this tying-in results from the corresponding designation of the part streams g and i. These are respectively the streams g and i downstream of the main heat exchanger 7 .
  • the compression/expansion arrangement 40 of FIG. 4 has just one turbo expander 33 . This reduces the number of components to be provided, but presupposes that a corresponding turbo expander 33 , with the necessary size and against the background of the mechanical loads which arise, is technically feasible.

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CN112212534A (zh) * 2019-07-10 2021-01-12 乔治洛德方法研究和开发液化空气有限公司 制冷和/或液化设备
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