WO2012141912A2 - Procédé de compression et de séparation d'air - Google Patents

Procédé de compression et de séparation d'air Download PDF

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Publication number
WO2012141912A2
WO2012141912A2 PCT/US2012/031211 US2012031211W WO2012141912A2 WO 2012141912 A2 WO2012141912 A2 WO 2012141912A2 US 2012031211 W US2012031211 W US 2012031211W WO 2012141912 A2 WO2012141912 A2 WO 2012141912A2
Authority
WO
WIPO (PCT)
Prior art keywords
compressors
compression stages
flow rate
compression
pressure
Prior art date
Application number
PCT/US2012/031211
Other languages
English (en)
Other versions
WO2012141912A3 (fr
Inventor
Daniel D. DeMORE
Robert L. Baker
John H. Royal
Original Assignee
Praxair Technology, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US13/087,734 external-priority patent/US20120260693A1/en
Application filed by Praxair Technology, Inc. filed Critical Praxair Technology, Inc.
Priority to CN201280018560.9A priority Critical patent/CN103946654A/zh
Priority to BR112013025224A priority patent/BR112013025224A2/pt
Priority to MX2013012089A priority patent/MX2013012089A/es
Priority to EP12714158.8A priority patent/EP2699859A2/fr
Priority to RU2013150796/06A priority patent/RU2013150796A/ru
Priority to CA2831911A priority patent/CA2831911A1/fr
Publication of WO2012141912A2 publication Critical patent/WO2012141912A2/fr
Publication of WO2012141912A3 publication Critical patent/WO2012141912A3/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/12—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0261—Surge control by varying driving speed
    • 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
    • F25J3/04078—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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04109—Arrangements of compressors and /or their drivers
    • F25J3/04115—Arrangements of compressors and /or their drivers characterised by the type of prime driver, e.g. hot gas expander
    • F25J3/04121—Steam turbine as the prime mechanical driver
    • 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
    • F25J3/04115—Arrangements of compressors and /or their drivers characterised by the type of prime driver, e.g. hot gas expander
    • F25J3/04133—Electrical motor as the prime mechanical driver
    • 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
    • F25J3/04284—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
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low 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
    • F25J3/044—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
    • F25J3/04406—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
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04781—Pressure changing devices, e.g. for compression, expansion, liquid pumping
    • 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
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • 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
    • F25J2230/40—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to a method and system for compressing a gas and an air separation method and plant incorporating such method and system in which a gas or air is compressed in a series of compression stages to a higher pressure that is maintained both at normal operating conditions and during turndown operational conditions when a lower flow rate of the gas or air is required. More particularly, the present invention relates to such a method and system and air separation method and plant in which the compression stages have variable speed motors driving compressors and the speed of each of the compressors is adjusted during turndown such that an initial of the compression stages operates at a point along a peak efficiency operating line.
  • each stage uses a centrifugal compressor in which gases entering an inlet to the compressor are distributed to a vaned compressor wheel that rotates to accelerate the gas and thereby impart the energy of rotation to the gas. This increase in energy is accompanied by an increase in velocity and a pressure rise. The pressure is recovered in a static vaned or vaneless diffuser that surrounds the compressor wheel and functions to decrease the velocity of the gas and thereby increase the gas pressure of the compressed gas.
  • the individual compressors of the compression stages can be driven by a common driver, such as an electric motor, through a transmission that consists of a single bull gear driving driven gears connected to the shafts of the compressors.
  • a common driver such as an electric motor
  • the transmission that consists of a single bull gear driving driven gears connected to the shafts of the compressors.
  • the air flow can be reduced by reducing the speed of the compressors.
  • the speed of the motor driving the compressors is decreased, the rotational speeds of all of the compressors will be reduced by the same amount.
  • the problem with this is that the output pressure of the multistage compression system will also be reduced.
  • the oxygen or other gas is required to be produced at a particular pressure for a customer, such a reduction in pressure will also reduce the pressure of the product.
  • 2007/0189905 discloses a multistage compression system that includes compressors connected in series with interstage cooling between the compressors. Each of the compressors is individually controlled by a speed controller.
  • the present invention provides methods and apparatus that are particularly applicable to air separation in which a multistage compression system can be run under turn down operating conditions while continuing to deliver compressed gas at the pressure obtained during normal operational conditions.
  • the present invention provides a method of compressing a gas.
  • the gas is compressed in a series of compression stages, from a lower pressure to a higher pressure.
  • the compression stages are operating at a normal operating condition during which the gas is supplied at the higher pressure and at a higher flow rate and at a turndown condition during which the gas is supplied at the higher pressure and at a lower flow rate.
  • the term "flow rate" as used herein and in the claims means mass flow rate.
  • the compression stages have compressors driven by variable speed motors capable of driving the compressors at speeds that are able to be independently adjusted for each of the compressors, thereby to adjust flow rate through the compressors and pressure ratios across the compressors.
  • variable speed motors means any type of device that can impart rotational motion to a compressor and in which the speed can be varied.
  • Examples of variable speed motors include variable speed electric motors, variable speed hydraulic motors, variable speed internal combustion engines and variable speed stream turbines.
  • the speeds of the variable speed motors are adjusted and therefore, the speeds of the compressors and the pressure ratios across the compressors such that an initial of the compressors associated with an initial of the compression stages operates at a point along a peak efficiency operating line thereof, where an initial pressure ratio, across the initial of the compressors, is directly proportional to the flow rate and below that of the normal operating condition thereby obtaining the lower flow rate.
  • Successive compressors located in successive compression stages, downstream of the initial of the compression stages, operate at the lower flow rate and at the pressure ratios that will enable the gas to be delivered at the higher pressure.
  • the flow rate is reduced during the turn down operating conditions while allowing the gas to be delivered at the pressure that is obtained during the normal operating conditions.
  • the method of the present invention allows the multistage compression system to be used in applications where a stable pressure is required under all operational regimes.
  • the method of the present invention is particularly energy efficient when the multistage compression system is operated during turn down conditions. The reason for this is that the power consumed by a multistage compression system have multiple stages is greatest at the initial compression stage because the volumetric flow rate is greatest in such stage due to the fact that the gas has the lowest density while being compressed in the initial stage.
  • the density increases and consequently less power is consumed in subsequent compression stage.
  • the initial compression stage is operated and turned down to a point along its peak efficiency operating line, the power consumed by such stage at turndown is less than would otherwise have been consumed had it not be operating along a point of its peak efficiency operating line.
  • the successive stages will recover the reduction of the pressure in the first stage of compression due to turn down and as such, will very likely not operate along their peak efficiency operating line.
  • the successive stages will consume less power than the initial compression stage, the loss in efficiency will be more than compensated for through operation of the initial stage at its peak efficiency. Consequently, the operation of a compression system in accordance with the present invention enables both a reduced power consumption and the higher pressure level of the normal operating condition to be obtained that would not be possible had the compression stages been turned down at a constant speed ratio.
  • the present invention provides a method of separating air in which the air is compressed in a series of compression stages, with interstage cooling between the compression stages and after cooling to cool the air after having been compressed in the series of compression states.
  • the air is compressed within the compression stages from a lower pressure to a higher pressure.
  • the compression stages are operated at a normal operating condition and a turndown operating condition. During normal operating conditions, the air is supplied to a main heat exchanger at the higher pressure and at a higher flow rate. During the turndown condition, the air is supplied air to the main heat exchanger at the higher pressure and at a lower flow rate.
  • the air is cooled, after having been compressed, within the main heat exchanger and is then introduced into a distillation column system to produce return and product streams. The return and product streams are warmed within the main heat exchanger to cool the air.
  • the compression stages have
  • variable speed motors capable of driving the compressors at speeds that are able to be independently adjusted for each of the compressors, thereby to adjust flow rate through the compressors and pressure ratios across the compressors.
  • the speeds of the variable speed motors and therefore, the speeds of the compressors and the pressure ratios across the compressors are adjusted such that an initial of the compressors associated with an initial of the compression stages operates at a point along a peak efficiency operating line thereof where an initial pressure ratio across the initial of the compressors is directly proportional to the flow rate and below that of the normal operating condition thereby obtaining the lower flow rate.
  • Successive compressors, located in successive compression stages, downstream of the initial of the compression stages operate at the lower flow rate and at the pressure ratios that will enable the gas to be delivered at the higher pressure.
  • the gas can be supplied from a final compressor of a final of the compression stages.
  • the gas can be supplied from a final compressor at the pressure and at the higher flow rate and with an auxiliary compressor by-passed.
  • the auxiliary compressor can be set in flow communication with the final compressor and the gas is then supplied from the auxiliary compressor at the pressure and at the lower flow rate.
  • the gas would of course be air.
  • the variable speed motors can be direct drive motors. Speed controllers are connected to the direct drive motors to control the speed of each of the direct drive motors.
  • the present invention provides a multistage compression system for compressing a gas.
  • a series of compression stages are provided to compress the gas from a lower pressure to a higher pressure in a final stage of the compression stages.
  • the multistage compression system is configured to operate in a normal operating condition and in a turndown operating condition. During the normal operating condition the gas is supplied at the higher pressure from the compression stages and at a higher flow rate. During the turndown operating condition and the gas is supplied at the higher pressure from the compression stages and at a lower flow rate.
  • the compression stages have compressors driven by variable speed motors capable of driving the compressors at speeds that are able to be independently adjusted for each of the compressors, thereby to adjust flow rate through the compressors and pressure ratios across the compressors and variable speed controllers connected to the compressors and configured to independently adjust the speed of the compressors.
  • a master controller is connected to the variable speed controllers and is configured such that during the turndown operating condition, the speeds of the variable speed motors and therefore, the speeds of the compressors and the pressure ratios across the compressors are adjusted such that an initial of the compressors associated with the initial of the compression stages operates at a point along a peak efficiency operating line thereof where an initial pressure ratio across the initial of the compressors is directly proportional to the flow rate and below that of the normal operating condition thereby obtaining the lower flow rate.
  • Successive compressors, located in successive compression stages, situated downstream of the initial of the compression stages operate at the lower flow rate and at the pressure ratios that will enable the compression stages to deliver the gas at the higher pressure.
  • intercoolers can be positioned between the
  • An aftercooler can be connected to the series of compression stages such that the gas is cooled after having been compressed in the series of compression stages.
  • the present invention also provides an air separation plant employing a series of compression stages to compress the air from a lower pressure to a higher pressure in a final stage of the compression stages.
  • Intercoolers are positioned between the series of the compression stages and an aftercooler connected to the final stage of the compression stages.
  • the multistage compression system is configured to operate in a normal operating condition and in a turndown operating condition. During the normal operating condition the air is supplied at the higher pressure from the compression stages and at a higher flow rate. During the turndown operating condition the air is supplied at the higher pressure from the compression stages and at a lower flow rate.
  • the compression stages have compressors driven by variable speed motors capable of driving the compressors at speeds that are able to be independently adjusted for each of the compressors, thereby to adjust flow rate through the compressors and pressure ratios across the compressors and variable speed controllers connected to the compressors and configured to independently adjust the speed of the compressors.
  • a main heat exchanger is connected to the multistage compression system and is configured to cool the air, after having been compressed.
  • a distillation column system, configured to produce return and product streams, is connected to the main heat exchanger such that the air, after having been cooled in the main heat exchanger, is introduced into the distillation column system and the return and product streams warm within the main heat exchanger to cool the air.
  • a master controller is connected to the variable speed controllers and configured such that during the turndown operating conditions, the speeds of the variable speed motors and therefore, the speeds of the compressors are adjusted such that an initial of the compressors associated with the initial of the compression stages operates at a point along a peak efficiency operating line thereof where an initial pressure ratio of the initial of the compressors is directly proportional to the flow rate and below that of the normal operating condition thereby obtaining the lower flow rate.
  • Successive compressors, located in successive compression stages, situated downstream of the initial of the compression stages operate at the lower flow rate and at the pressure ratios that will enable the compression stages to deliver the gas at the higher pressure.
  • the compression stages can be configured such that during both normal operating conditions and turndown operating conditions the gas is supplied from a final compressor of a final of the compression stages.
  • the compression stages can be provided with a final compressor in a final
  • a flow control network having a by-pass line, a first valve positioned between the by-pass line and an aftercooler connected to the final compressor.
  • a second valve is positioned between the aftercooler and the auxiliary compressor.
  • Each of the first valve and the second valves are operable to be set in a closed position and an open position such that during normal operating conditions, the first valve is set in the open position and the second valve is set in the closed position and the gas is supplied from a final compressor at the pressure and at the higher flow rate through the by-pass line and with the auxiliary compressor by-passed.
  • the first valve is set in the closed position and the second valve is set in the open position such that the auxiliary compressor is connected to the aftercooler and the gas is supplied from the auxiliary compressor at the pressure and at the lower flow rate.
  • the gas would of course be air.
  • the variable speed motors can be direct drive motors.
  • FIG. 1 is a schematic diagram of a multistage compression system for carrying out a method in accordance with the present invention
  • Fig. 2 is a graphical representation of a map of compressor performance for the multistage compression system shown in Fig. 1 during normal operational conditions.
  • Fig. 3 is a graphical representation of a map of compressor performance for the multistage compression system shown in Fig. 1 during turndown operational conditions.
  • Fig. 4 is an alternative embodiment of Fig. 1;
  • FIG. 5 is a schematic diagram of an air separation plant incorporating a multistage compression system shown in Fig. 1 or Fig. 4. for carrying out a method in accordance with the present invention.
  • Multistage compression system 1 is a multistage compression unit having four compression stages 10, 12, 14 and 16 that is designed to compress a gas contained in a feed stream 18 from a lower pressure to a higher pressure and thereby produce a compressed gas stream 20 containing the gas at the higher pressure. It is understood that a multistage compression system in accordance with the present invention could include a greater or lesser number of stages.
  • Compression stage 10 is provided with a compressor 22 that is driven by a variable speed motor 24. It is understood that the compressor 22 can be centrifugal compressor of the type described above that is driven by a variable speed electric permanent magnet motor.
  • variable speed motor 24 is controlled by a speed controller 26 that could be a variable frequency controller where the drive. 24 is a variable speed electric permanent magnet motor. It is to be pointed out that the variable speed motor 24 or any other motor employed in connection with the present invention could be another type of device, for example, a throttle controlled steam turbine.
  • the successive compression stages 12, 14 and 16 are similarly provided with compressors 28, 30 and 32, variable speed motors 34, 36 and 38 and speed controllers 40, 42 and 44, respectively.
  • Multistage compression system 1 also incorporates interstage cooling and after cooling.
  • interstage cooling and after cooling As known in the art, as the gas is compressed in each stage of compression, the temperature of the gas rises. As a result, the density of the gas decreases and more power has to be expended in a stage to compress the gas. By cooling the gas between stages, the density of the gas is greater than without such cooling resulting in a power savings.
  • interstage cooler 48 After the gas has been further compressed in compressor 28, it is cooled in interstage cooler 48 before being fed into the inlet of compressor 30 and after the gas has been compressed in compressor 30, the gas is cooled in interstage cooler 50. After the gas has been compressed in compressor 32, it is cooled in aftercooler 52 to remove the heat of compression.
  • Interstage coolers 46, 48 and 50 are known in the art and can consist of liquid cooled, fin and tube heat exchangers. Aftercooler 52 is preferably also incorporates liquid cooled, fin and tube heat exchanger construction or liquid cooled, direct contact heat exchange.
  • Multistage compressor system 1 is designed to produce compressed gas stream 20 at a specific pressure and flow rate. When multistage compressor system 1 is operating in this manner, it is operating under a normal operating condition. When it is desired to reduce the flow of compressed gas stream 20, multistage compressor system 1 will still deliver the compressed gas stream at the same specific pressure that is required under the normal operating condition, but at the reduced flow. Under such circumstances, multistage compressor system 1 is said to be operating under a turndown operating condition.
  • the control is exercised by a programmable logic controller 54 that sends appropriate control signals through a control network 56 that can be a set of data transmission lines to variable speed controllers 26, 40, 42 and 44 that act to control the speed of motors 24, 34, 36 and 38 and therefore, the speed of the compressors 22, 28, 30 and 32.
  • a normalized map of compressor performance is illustrated in which under the design operating conditions all of the compressors 22, 28, 30 and 32 are operating along their peak efficiency operating line where the pressure ratio is proportional to the flow through the compressors and therefore, at peak efficiency and at 100% of their speed at the normal operating condition.
  • the speed of the compressor 22 is downwardly adjusted to a point along the peak efficiency operating line.
  • the adjustment of speed can be gradual along this operating line or simply controlled to reduce the speed directly from the normal operating condition to a point corresponding to the turn down condition.
  • the computation is performed in the programmable logic controller 54 which also, generates the required control signals that are applied to the variable speed controllers through the control network 56. While one or more of the subsequent compressors 28, 30 and 32 may no longer be operating along the peak efficiency operating line, the compressor 22 of the initial compression stage 10 will remain operating along the peak efficiency operating line and therefore, be operated efficiently. Why this is important is that the compressor 22 will invariably have the greatest electrical power requirements. Thus, during turndown operating conditions, the multistage compressor system will invariably be more efficient than if the compressor speeds were stepped down together as provided for in the prior art.
  • the inlet pressure of the feed stream 18 is about 15 psia and the required discharge pressure is 90 psia of the compressed gas stream 20 for a total pressure ratio of 6.00 across the multistage compressor system 1.
  • Each of the compressors 22, 28, 30 and 32 operate at a design pressure ratio of 1.57.
  • the flow through successive compressors decreases because the volumetric flow is decreasing as the density of the gas decreases due to the compression of the gas.
  • the normalized pressure ratio across compressor 22 will be adjusted to a point along the peak efficiency operating line to be .7.
  • each compressor 28, 30 and 32 will be operated at a normalized pressure ratio of 1.126 in accordance with the power law. In other words, 0.700 x 1.126 x 1.126 x 1.126 is equal to 1.00 or taking the actual pressure ratios, 1.10 x 1.76 x 1.76 x 1.76 is equal to 6.00. Therefore, although multistage compression system 1 is being turned down to 80 percent of flow, it will still deliver the compressed gas stream 20 at 90 psia or in other words, at the design pressure that would be delivered during the normal operating condition. To achieve these conditions, the speed of the compressors 22, 28, 30 and 32 will be adjusted by their respective variable speed controllers 26, 40, 42 and 44 to speeds indicated by figure 3: compressor 22 will be operated at approximately 83 percent of its design rotational speed;
  • Programmable logic controller 54 could be programmed to simply have a set of pre-set turn down conditions or computations could be made as set forth above to turn the multistage compression system 1 down to a set turn down flow rate that would be an input to programmable logic controller 54.
  • pressure transducers 59, 60, 62 and 64 to measure the pressure ratios across the compressors 28, 30 and 32.
  • Pressure transducer 58 is provided to measure the discharge pressure of compressor 22 and fine tune the speed thereof to make certain it is at a specific location on the operating chart shown in Figure 2, for instance, when operating at the turndown operating condition.
  • Signals referable to the pressures serve as a further input by means of data transmission lines 65, 66, 68, 70 and 72, respectively, to the programmable logic controller 54.
  • a flow meter 74 able to send a signal via a data transmission line 76 to the programmable logic controller 54 along with a pressure transducer 78 and an associated data transmission line 80 could also be present.
  • This instrumentation and the programmable logic controller 54 may be used to implement the control operation of the multistage compression system 1 described above.
  • the programmable logic controller 54 can be programmed to receive an input data referable to the desired flow rate and then to compute a reduced speed for variable speed motor 24 in accordance with an algebraic representation of Figure 3 or a database containing the data within Figure 3 and generate a control signal referable to such computed reduced speed.
  • the control signal is then input into the variable speed controller 26 through data transmission line 56 that in turn controls the speed of variable speed motor 24 to obtain the reduced speed.
  • Flow meter 74 generates a signal referable to the mass flow rate of compressed gas stream 20 that is transmitted as an input into programmable logic controller 54 by means of data transmission line 80.
  • Programmable logic controller is programmed to respond to such signal and send a revised signal to variable speed controller 26 should the flow rate not be within 2 percent of the desired flow rate input into programmable logic controller 54.
  • the further computations are performed by programmable logic controller 54 to compute the pressure ratios in a manner set forth in the above example, generate control signals to be transmitted by data transmission line 56 to variable speed controllers 40, 42 and 44 to in turn adjust the speeds of variable speed motors 34, 36 and 38 and therefore, compressors 28, 30 and 32 to achieve the desired pressure ratios computed by programmable logic controller 54.
  • Pressure signals referable to inlet and outlet pressures are generated by pressure transducers 59, 60, 62 and 64 and fed as another input into programmable logic computer 54 that computes the actual pressure ratios and then as necessary generates and individually updates the control signals being sent to variable speed controllers 40, 42 and 44 until measured pressure ratios are within 2 percent of the computed pressure ratios. Increased thereafter, data generated on the basis of the signal referable to mass flow as that is produced by flow meter 74 is used to confirm that the desired train flow is achieved. If the desired flow rate is not achieved, the process outlined above is repeated until the flow rate is within about two percent of the desired flow rate.
  • Figures 2 and 3 and the above example assume aerodynamically identical compressor stages; that is, while physically different and operating at differing pressure and volumetric flows, each stage conforms to identical design rules and operates such that their fluid dynamic flows are effectively scaled variants of one another.
  • multistage compression system 1 is not limited to using aerodynamically identical compressor stages.
  • Non-aerodynamically identical stages may be used as well.
  • a multistage compression system 1 ' is illustrated.
  • a final compression stage 14' is illustrated having a final compressor 30' and an auxiliary compressor 32" in an auxiliary compressions stage 16'.
  • a flow control network 90 is also included.
  • the flow control network 90 is provided with a by-pass line 92, a first valve 94 positioned within the by-pass line 92 and a second valve 96 positioned between the aftercooler 50 and the auxiliary compressor 32'.
  • Each of the first valve 94 and the second valve 96 are operable to be set in a closed position and an open position and to be activated by the programmable logic controller 54' through electrical connections 98 and 100, respectively.
  • the programmable logic controller is programmed such that during the normal operating condition, the first valve 94 is set in the open position and the second valve 96 is set in the closed position and the compressed gas stream 20' is thereby supplied from the final compressor 30' at the design pressure and at the higher flow rate through the bypass line 92. Under such circumstances, the auxiliary compressor 32' is bypassed.
  • the first valve 94 is set in the closed position and the second valve 96 is set in the open position such that the auxiliary compressor 30' supplied compressed gas through the aftercooler 50 and to the auxiliary compressor 32'.
  • the auxiliary compressor 32' thereby supplies the compressed gas stream 20' from its associated aftercooler 52 at the same design pressure, but at the lower flow rate to be obtained during turndown operation conditions.
  • the multistage compression system 1 ' is turned down in a similar fashion to the multistage compression system 1 in that the speed of the initial compressor 22 of the compression stage 10 is downwardly adjusted to a point along the peak efficiency operating line and the required pressure ratio for the subsequent compressors 28, 30' and 32' are divided to deliver the compressed gas stream 20' at the required design delivery pressure in a manner set forth above.
  • the compressor system 1 ' permits the delivery of reduced flow at design pressure while turning down compressor 30' and its preceding stages each along its peak efficiency operating line. It might be necessary to have a series of compression stages in place of the singe compressor 32' in order to achieve the design pressure at reduced flow conditions.
  • an air separation plant 2 that incorporates a multistage compression system 110 that can either be in the form illustrated in connection with Figures 1 or 4 and controlled in a manner that has been described above.
  • the compression system 1 10 compresses a feed air stream 112 to produce a compressed air stream designated by reference numeral 114 that could therefore, be the compressed stream 20 or 20' produced by multistage compression systems 1 and 1 ', respectively.
  • air separation plant 2 does not include a pre-purification unit to remove higher boiling impurities from the feed air stream 112 in that the air separation plant 2 is designed to be used in an enclave of air separation plants as such, the feed air could be centrally processed.
  • a pre-purification unit could be located
  • Compressed air stream 114 is divided into a main compressed air stream 116 and two subsidiary compressed air streams 118 and 120.
  • Main compressed air stream 116 is cooled within a main heat exchanger 122 to a temperature suitable for its distillation in an air separation unit 124.
  • Subsidiary compressed air stream 118 is compressed in a booster compressor 126 to produce a boosted pressure air stream 128 that is cooled in an after-cooler 130 and then partially cooled within main heat exchanger 122 to an intermediate temperature between the cold and warm end temperature of main heat exchanger 122.
  • the boosted pressure air stream 128, after having been partially cooled, is introduced into a turbo expander 138 coupled to the booster compressor 126 to produce an exhaust stream 140 that is reintroduced into main heat exchanger 122 and then fully cooled and introduced into the air separation unit 124.
  • the purpose of the foregoing is to impart refrigeration into the air separation plant 2 for purposes of overcoming warm end heat exchanger losses, heat leakage into the cold box housing the air separation unit 124 and to create liquids.
  • Subsidiary compressed air stream 120 is in turn introduced into booster compressor 142 to produce a boosted pressure air stream 144 that after cooling in aftercooler 144 is fully cooled in main heat exchanger 122 to produce a liquid air stream 146 that is also introduced into air separation unit 124.
  • the production of boosted pressure air stream 144 is necessary to warm a pumped return stream 152 that could be liquid oxygen or liquid nitrogen and is shown for purposes of illustration only.
  • Air separation unit 124 could be a double column unit having a high pressure column and a low pressure column operatively associated within one another in a heat transfer relationship by a condenser reboiler. Both of such columns have mass transfer contacting elements such as trays, structured packing, random packing or a combination of such elements. These element contact liquid and vapor phases of the air in a manner known in the art such that the liquid phases becomes ever more rich in oxygen as it descends and the vapor phase becomes ever more rich in nitrogen as its ascends in either the high or low pressure columns.
  • the high pressure column produces a crude liquid oxygen column bottoms that is further refined in the low pressure column and a nitrogen-rich vapor column overhead that is condensed in the condenser reboiler to produce reflux for both the high and low pressure columns.
  • the low pressure columns produces an oxygen-rich liquid that can be removed as return stream 148, pumped in a pump 152 to produce the pumped return stream 150 which is fully warmed within main heat exchanger 122 to produce a product at pressure.
  • the low pressure column also produces a nitrogen-rich vapor column overhead that could be removed as a return stream 154 and then, fully warmed in main heat exchanger 122 to produce a nitrogen product.
  • air separation unit 124 would incorporate other known heat exchangers such as a subcooling unit to subcool the reflux to the low pressure column and the crude liquid oxygen to be further refined in the low pressure column and expansion valves to expand such streams to a suitable pressure for introduction into the low pressure column.
  • liquid air stream 146 could be expanded by expansion valves and introduced into the low pressure column and also the high pressure column.
  • the exhaust stream 140 could be introduced into the low pressure column or possibly the high pressure column.
  • the main heat exchanger is typically a brazed aluminum unit or units arranged in parallel. Further the main heat exchanger could also incorporate a high pressure unit designed to cool the boosted pressure air stream 142 and to warm the pumped return stream 152.
  • the air separation unit 124 could incorporate an argon column or columns to produce an argon product.
  • air separation unit 124 could be a single column designed to produce a nitrogen product.
  • multistage compression unit 110 is designed to function to produce the compressed air stream 114 at a constant pressure both during normal operational conditions of air separation plant 2 where air separation plant 2 is making products, such as pumped return stream 152, at a design production rate and during turn down operating conditions where products are produced at a lower flow rate.
  • the multistage compression system 110 is turned down to reduce the flow rate of compressed air stream 114.
  • Compressed air stream 114 is divided into a main compressed air stream 116 and two subsidiary compressed air streams 118 and 120.
  • the reduced flow in compressed air stream 114 may be distributed among: subsidiary compressed air stream 120 thereby reducing the production of liquid air stream 146; subsidiary compressed air stream 118 thus reducing the refrigeration available to air separation plant 2; and/or reducing the flow rate of compressed air stream 116 so that production is decreased. Distribution of the reduced flow from compressed air steam 114 may be apportioned in any way among compressed air streams 116, 118, 120 such that the sum of flows in compressed air steams 116, 118 and 120 totals the flow in compressed of stream 114. As an example in a plant having high and low pressure columns that is designed to produce a pressurized oxygen product, the pumped return stream 152 would be made up of oxygen-enriched liquid removed from the low pressure column.
  • the flow of streams 116 and 120 would be reduced and the flow rate of stream 118 could remain the same as during design operation.
  • the speed of the booster compressor 142 would have to be increased to allow the discharge pressure to remain at design.

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  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
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Abstract

L'invention porte sur un procédé de compression, un système de compression à étages multiples, un procédé de séparation d'air et une installation dans laquelle un gaz est comprimé dans une série d'étages de compression pour produire un gaz comprimé et où chacun des étages de compression comprend un compresseur à vitesse variable. Dans un tel procédé et un tel système de compression, l'air comprimé est produit à une pression qui reste stable aussi bien dans des conditions de fonctionnement normal que dans des conditions de ralentissement pendant lesquelles le débit du gaz est réduit. Cette réduction est obtenue par réduction de la vitesse du compresseur dans un étage de compression initial de telle sorte que le compresseur opère à un point de sa courbe de fonctionnement au pic de rendement auquel le rapport de pression est directement proportionnel au débit, et que le débit de ralentissement inférieur est obtenu à une pression réduite qui est obtenue dans des étages de compression successifs.
PCT/US2012/031211 2011-04-15 2012-03-29 Procédé de compression et de séparation d'air WO2012141912A2 (fr)

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CN201280018560.9A CN103946654A (zh) 2011-04-15 2012-03-29 压缩方法和空气分离
BR112013025224A BR112013025224A2 (pt) 2011-04-15 2012-03-29 método de comprimir um gás, método de separar ar, sistema de compressão de múltiplos estágios para comprimir um gás, e, instalação de separação de ar
MX2013012089A MX2013012089A (es) 2011-04-15 2012-03-29 Metodo de compresion y separacion de aire.
EP12714158.8A EP2699859A2 (fr) 2011-04-15 2012-03-29 Procédé de compression et de séparation d'air
RU2013150796/06A RU2013150796A (ru) 2011-04-15 2012-03-29 Способ сжатия и разделение воздуха
CA2831911A CA2831911A1 (fr) 2011-04-15 2012-03-29 Procede de compression et de separation d'air

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US13/087,734 US20120260693A1 (en) 2011-04-15 2011-04-15 Compression method and air separation
US13/087,734 2011-04-15
US13/432,385 2012-03-28
US13/432,385 US20120263605A1 (en) 2011-04-15 2012-03-28 Compression method and air separation

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US20160032935A1 (en) * 2012-10-03 2016-02-04 Carl L. Schwarz System and apparatus for compressing and cooling an incoming feed air stream in a cryogenic air separation plant
US20160053764A1 (en) * 2012-10-03 2016-02-25 Ahmed F. Abdelwahab Method for controlling the compression of an incoming feed air stream to a cryogenic air separation plant
US10385861B2 (en) * 2012-10-03 2019-08-20 Praxair Technology, Inc. Method for compressing an incoming feed air stream in a cryogenic air separation plant
US20160032934A1 (en) * 2012-10-03 2016-02-04 Carl L. Schwarz Method for compressing an incoming feed air stream in a cryogenic air separation plant
US10443603B2 (en) * 2012-10-03 2019-10-15 Praxair Technology, Inc. Method for compressing an incoming feed air stream in a cryogenic air separation plant
US20150114037A1 (en) * 2013-10-25 2015-04-30 Neil M. Prosser Air separation method and apparatus
US10378536B2 (en) * 2014-06-13 2019-08-13 Clark Equipment Company Air compressor discharge system
JP6670645B2 (ja) * 2016-03-16 2020-03-25 株式会社日立産機システム 多段圧縮機
DE102016112453A1 (de) * 2016-07-07 2018-01-11 Man Diesel & Turbo Se Getriebeturbomaschine
CN106762756B (zh) * 2016-12-15 2019-05-31 福建景丰科技有限公司 一种纺织用空气压缩系统及空气压缩方法
CN108691851A (zh) * 2018-06-04 2018-10-23 肇庆市高新区晓靖科技有限公司 一种金属加工打磨的气动工装

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CN103946654A (zh) 2014-07-23
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CA2831911A1 (fr) 2012-10-18
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WO2012141912A3 (fr) 2015-04-02
RU2013150796A (ru) 2015-05-20

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