JPS6044584B2 - 液体窒素または液体酸素を採取する空気分離方法 - Google Patents

液体窒素または液体酸素を採取する空気分離方法

Info

Publication number
JPS6044584B2
JPS6044584B2 JP52151768A JP15176877A JPS6044584B2 JP S6044584 B2 JPS6044584 B2 JP S6044584B2 JP 52151768 A JP52151768 A JP 52151768A JP 15176877 A JP15176877 A JP 15176877A JP S6044584 B2 JPS6044584 B2 JP S6044584B2
Authority
JP
Japan
Prior art keywords
air
nitrogen
liquid
oxygen
air separation
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.)
Expired
Application number
JP52151768A
Other languages
English (en)
Other versions
JPS5484888A (en
Inventor
祥二 小山
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP52151768A priority Critical patent/JPS6044584B2/ja
Publication of JPS5484888A publication Critical patent/JPS5484888A/ja
Publication of JPS6044584B2 publication Critical patent/JPS6044584B2/ja
Expired legal-status Critical Current

Links

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
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04339—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of air
    • F25J3/04345—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of air and comprising a gas work expansion loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—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
    • F25J3/04309—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 nitrogen
    • F25J3/04315—Lowest pressure or impure nitrogen, so-called waste nitrogen expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/044—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
    • F25J3/04763—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
    • F25J3/04787—Heat exchange, e.g. main heat exchange line; Subcooler, external reboiler-condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/70—Refluxing the column with a condensed part of the feed stream, i.e. fractionator top is stripped or self-rectified
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/72—Refluxing the column with at least a part of the totally condensed overhead gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • 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

Landscapes

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

Description

【発明の詳細な説明】 本発明は、製造する窒素または酸素のほとんどまたは
そのすべてを液体で採取する空気分離方法に関するもの
てある。
一般に深冷分離による空気分離装置で製造する窒素ま
たは酸素を液体で採取する場合は、液化装置を単独に付
設する方法、窒素ガスを膨脹タービンに入れて寒冷発生
させる方法等がある。
従来より採用されている液化装置は、空気分離装置から
採取した窒素ガスまたは酸素ガスを、２０〜３５に９／
ｄＧ程度に昇圧した空気または窒素を循環させる液化回
路に導入し、循環する空気または窒素が膨脹タービンに
よつて発生させる寒冷を利用して液体窒素または液体酸
素を採取するものである。そのため、空気分離装置本体
に加え液化装置として循環用圧縮機のほか膨脹タービン
、熱交換器類等が必要となり、装置価格および運転コス
トも高く据付面積も大きくなる。 また、窒素ガスをバ
イパスさせて膨脹タービンに導き、寒冷を発生させて液
体窒素または液体酸素を採取する場合には、窒素ガスを
廃ガスラインに合流させる方法が一般的であるが、この
場合、窒素ガスを減圧する必要があり、また、膨脹ター
ビンの入口温度も低下すること等、寒冷発生効率の面で
不利となり、製品窒素または酸素のほとんどまたはその
すべてを液体で採取する方法としては好ましくない。
本発明は、製品窒素または酸素のほとんどまたはすべて
を液体で採取する空気分離装置において、単独の液化装
置を付設することなく、原料空気の一部を循環させるこ
とにより、効率良く液体窒素または液体酸素を製造しよ
うとするものてある。
以下、本発明により液体窒素を採取する場合の実施例
について第１図により説明する。
第１図において、原料空気はろ過器１から吸入され、
原料空気圧縮機３により製品窒素圧力から定まる圧力ま
て昇圧されて冷却器４へ導かれる。
冷却器４により冷却された原料空気は、脱湿塔５により
水分と炭酸ガスを除去されて空気熱交換器６に入り、装
置内から出る低温ガスと熱交換して冷却される。空気熱
交換器６により液化温度まて冷却された原料空気は、窒
素分離に必要な原料空気を精留塔７に導く管１１と寒冷
発生用膨脹タービン８に導く循環回路の管１２に分岐さ
れ、管１２より導かれた低温空気と、脱湿塔５の出口よ
り管１３を介して導かれた常温空気は混合された循環空
気となり、膨脹タービン８で大気圧まで膨脹することに
より寒冷を発生させ、管１４を介して空気熱交換器６に
導かれる。空気熱交換器６により３〜５℃程度まで温度
回復した循環空気は、管１５を通り原料空気圧縮機３に
吸入側に設けられたバッファ−タンク２に導かれ、淵過
器１から入る原料空気と合流して再び原料空気圧縮機３
に入り循環する。一方、空気熱交換器６を出て管１１に
より精留塔７に導かれた原料空気は、精留塔７内におい
て精留分離され、管１６より液体窒素を採取し、廃ガス
は管１７より取り出された膨脹タービン９に入り、寒冷
を発生して装置内から出る。
第２図は本発明により液体酸素を採取する場合の実施例
を示したもので、第１図と同部分は同符号で示す。
空気熱交換器６を出て管１１により精留塔７に導かれた
原料空気は、精留塔７下部で液化された後精留塔７内部
で精留分離され、管１８より液体＝酸素を採取する。
以上に述べた如く本発明方法によれば、製品窒素または
酸素のほとんどまたはそのすべてを液体で採取すること
が、液化装置を付設することなく容易にできるだけでな
く、単に液体窒素または液体酸素を採取するために原料
空気量を増やした場合に比べ、原料空気圧縮機の吸入温
度が低くなるため運転コストを低減することができ、ま
た、循環空気は水分および炭酸ガスを含まないドライガ
スであるため、脱湿塔の処理能力は循環空気量を除いた
原料空気量でよく、脱湿塔を小型化することができる等
の利点を有している。
【図面の簡単な説明】
第１図は本発明により液体窒素を採取する場合の実施例
を示す系統図、第２図は本発明により液体酸素を採取す
る場合の実施例を示す系統図である。 １・・・・・・■過器、２・・・・・・バッファ−タン
ク、３・・・・・・原料空気圧縮機、４・・・・・・冷
却器、５・・・・・・脱湿塔、６・・・・・・空気熱交
換器、７・・・・・・精留塔、８，９・・・膨脹タービ
ン、１０・・・・・・再生加熱器、１１〜１８・・・・
・・管。

Claims (1)

    【特許請求の範囲】
  1. １ 原料空気中の水分および炭酸ガスを脱湿塔で吸着除
    去し、空気熱交換器で冷却した後精留塔で深冷分離して
    、製造する窒素または酸素のほとんどまたはそのすべて
    を液体で採取する空気分離装置において、脱湿された原
    料空気の一部を膨脹タービンによりほぼ大気圧まで減圧
    させ、空気熱交換器を介して温度回復させた後原料空気
    圧縮機の吸入ラインへ戻すようにしたことを特徴とする
    液体窒素または液体酸素を採取する空気分離方法。
JP52151768A 1977-12-19 1977-12-19 液体窒素または液体酸素を採取する空気分離方法 Expired JPS6044584B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52151768A JPS6044584B2 (ja) 1977-12-19 1977-12-19 液体窒素または液体酸素を採取する空気分離方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52151768A JPS6044584B2 (ja) 1977-12-19 1977-12-19 液体窒素または液体酸素を採取する空気分離方法

Publications (2)

Publication Number Publication Date
JPS5484888A JPS5484888A (en) 1979-07-06
JPS6044584B2 true JPS6044584B2 (ja) 1985-10-04

Family

ID=15525860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52151768A Expired JPS6044584B2 (ja) 1977-12-19 1977-12-19 液体窒素または液体酸素を採取する空気分離方法

Country Status (1)

Country Link
JP (1) JPS6044584B2 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105571270B (zh) * 2014-10-14 2017-12-22 中国石油化工股份有限公司 一种空气分离氧气快速变负荷的装置及方法

Also Published As

Publication number Publication date
JPS5484888A (en) 1979-07-06

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