EP2042824A1 - Procédé destiné à démarrer une installation pour la séparation cryogénique d'air et installation pour la séparation cryogénique d'air - Google Patents

Procédé destiné à démarrer une installation pour la séparation cryogénique d'air et installation pour la séparation cryogénique d'air Download PDF

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Publication number
EP2042824A1
EP2042824A1 EP07023681A EP07023681A EP2042824A1 EP 2042824 A1 EP2042824 A1 EP 2042824A1 EP 07023681 A EP07023681 A EP 07023681A EP 07023681 A EP07023681 A EP 07023681A EP 2042824 A1 EP2042824 A1 EP 2042824A1
Authority
EP
European Patent Office
Prior art keywords
air
direct contact
cleaning device
distillation column
cooler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07023681A
Other languages
German (de)
English (en)
Inventor
Andreas Brox
Markus Huppenberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde GmbH
Original Assignee
Linde GmbH
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 DE102007052136A external-priority patent/DE102007052136A1/de
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP2042824A1 publication Critical patent/EP2042824A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • 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
    • F25J3/04181—Regenerating the adsorbents
    • 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
    • F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
    • 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
    • F25J3/04775—Air purification and pre-cooling
    • 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
    • F25J3/04818—Start-up of the process
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
    • F25J2205/32—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as direct contact cooling tower to produce a cooled gas stream, e.g. direct contact after cooler [DCAC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
    • F25J2205/34—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as evaporative cooling tower to produce chilled water, e.g. evaporative water chiller [EWC]
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/40—Processes or apparatus involving steps for recycling of process streams the recycled stream being air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C3/00—Other direct-contact heat-exchange apparatus
    • F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C3/00—Other direct-contact heat-exchange apparatus
    • F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
    • F28C3/08—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour with change of state, e.g. absorption, evaporation, condensation

Definitions

  • the invention relates to a method for starting up a cryogenic air separation plant according to the preamble of claim 1.
  • the feed mixture is brought into direct heat exchange with a coolant, for example cold water, and thereby cooled. It is used in particular for removing heat of compression, which has arisen in a feed gas compressor, which is usually connected upstream.
  • a coolant for example cold water
  • a subsequent "cleaning device” is usually designed as an adsorption device and in particular has at least two switchable container, which are operated cyclically. It serves to separate unwanted components, for example those which can freeze out in the low-temperature part.
  • the low-temperature part of the feed mixture is first cooled to about dew point and then decomposed in the distillation column system.
  • the low-temperature part thus contains one or more heat exchangers, in particular a main heat exchanger for cooling feed air in indirect heat exchange with reflux, and one or more distillation columns.
  • the product is withdrawn in gas or liquid form.
  • the cryogenic part is usually thermally insulated by being enclosed by one or more cold boxes.
  • Direct contact coolers are often operated with water circuits in which at least a portion of the withdrawn from the direct contact cooler, heated water is cooled in one or more evaporative coolers and returned to the direct contact cooler.
  • evaporative cooler cooling gas is brought into direct countercurrent with water. The water partially evaporates and is cooled down.
  • a dry residual gas from the distillation is available during normal operation of the plant, for example, impure residual nitrogen.
  • the air compressor and cleaning device When starting up a cryogenic air separation plant, the air compressor and cleaning device are first put into operation, while the distillation column system is still standing still.
  • the content of the cleaning device usually an adsorbent, in particular a molecular sieve, has to be regenerated during this start-up phase in order to be able to fulfill its cleaning function when the distillation-column system is put into operation.
  • air is introduced from a connected in the adsorption mode container of the cleaning device as a regeneration in a connected in the regeneration tank container of the cleaning device.
  • the invention is therefore based on the object to make the startup of a cryogenic air separation plant economically cheaper.
  • This object is achieved in that before starting the distillation column system, an air stream is introduced via a starting line as a cooling gas stream in the evaporative cooler.
  • an air flow is used in the invention.
  • Such a flow of air is also in this commissioning phase available.
  • the evaporative cooler and the direct contact cooler can already be put into operation and provide for a relatively low temperature in the regenerator.
  • direct contact coolers and evaporative coolers are arranged as a unit or at least as immediately adjacent units because of their functional relationship. Particularly in this case, it is favorable if, according to a first variant of the invention, the air stream is taken out of the feed air line downstream of the direct contact cooler and upstream of the cleaning device.
  • the air stream downstream of the cleaning device is removed from the feed air line. This is particularly advantageous when the evaporative cooler is located closer to the low-temperature part and thus regularly closer to the cleaning device as the direct contact cooler, as in the EP 1666822 A1 is described.
  • the invention also relates to a device for cryogenic separation of air according to claims 4 to 6.
  • FIG. 1 In FIG. 1 are an air compressor 1, a direct contact cooler 2, an evaporative cooler 3, a cleaning device 4, a low temperature part (coldbox) 5, which contains a distillation column system, and a feed air line 10, 11, 12 shown as essential elements of a cryogenic air separation plant. Nitrogen from the distillation column system is passed as a cooling gas to the evaporative cooler via a Regeneriergastechnisch 20 in normal operation, which is connected via a cold water line 30 to the direct contact cooler.
  • a starting line 32 air which is taken between direct contact cooler 2 and cleaning device 4 from the feed air line 11, introduced as a cooling gas in the evaporative cooler 3.
  • FIG. 2 is different from this FIG. 1 in that the evaporative cooler is arranged closer to the coldbox than to the direct contact cooler (cf. EP 1666822 A1 ).
  • the evaporative cooler is arranged closer to the coldbox than to the direct contact cooler (cf. EP 1666822 A1 ).
  • air which is removed downstream of the cleaning device 4 from the feed air line 12 is introduced as cooling gas into the evaporative cooler 3.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP07023681A 2007-09-28 2007-12-06 Procédé destiné à démarrer une installation pour la séparation cryogénique d'air et installation pour la séparation cryogénique d'air Withdrawn EP2042824A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007046710 2007-09-28
DE102007052136A DE102007052136A1 (de) 2007-09-28 2007-10-31 Verfahren zum Anfahren einer Tieftemperatur-Luftzerlegungsanlage und Tieftemperatur-Luftzerlegungsanlage

Publications (1)

Publication Number Publication Date
EP2042824A1 true EP2042824A1 (fr) 2009-04-01

Family

ID=39382068

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07023681A Withdrawn EP2042824A1 (fr) 2007-09-28 2007-12-06 Procédé destiné à démarrer une installation pour la séparation cryogénique d'air et installation pour la séparation cryogénique d'air

Country Status (1)

Country Link
EP (1) EP2042824A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336486A (ja) * 1989-06-30 1991-02-18 Nippon Sanso Kk 空気液化分離装置冷水塔の運転方法
JPH05172459A (ja) * 1991-12-25 1993-07-09 Kobe Steel Ltd 空気分離プロセスにおける原料空気の前処理方法
US20070193446A1 (en) * 2004-03-31 2007-08-23 Morimitsu Nakamura Method of restarting feed air purifier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336486A (ja) * 1989-06-30 1991-02-18 Nippon Sanso Kk 空気液化分離装置冷水塔の運転方法
JPH05172459A (ja) * 1991-12-25 1993-07-09 Kobe Steel Ltd 空気分離プロセスにおける原料空気の前処理方法
US20070193446A1 (en) * 2004-03-31 2007-08-23 Morimitsu Nakamura Method of restarting feed air purifier

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