JP4841591B2 - 窒素製造方法及び装置 - Google Patents
窒素製造方法及び装置 Download PDFInfo
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- JP4841591B2 JP4841591B2 JP2008162701A JP2008162701A JP4841591B2 JP 4841591 B2 JP4841591 B2 JP 4841591B2 JP 2008162701 A JP2008162701 A JP 2008162701A JP 2008162701 A JP2008162701 A JP 2008162701A JP 4841591 B2 JP4841591 B2 JP 4841591B2
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- nitrogen
- oxygen
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- enriched
- nitrogen gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04254—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using the cold stored in external cryogenic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
- F25J3/04424—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 without thermally coupled high and low pressure columns, i.e. a so-called split columns
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/20—Processes or apparatus using separation by rectification in an elevated pressure multiple column system wherein the lowest pressure column is at a pressure well above the minimum pressure needed to overcome pressure drop to reject the products to atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/42—Nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2250/00—Details related to the use of reboiler-condensers
- F25J2250/02—Bath type boiler-condenser using thermo-siphon effect, e.g. with natural or forced circulation or pool boiling, i.e. core-in-kettle heat exchanger
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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)
Description
塔頂部から経路33に抜き出された前記第1窒素ガスは、一部が経路34に分岐して主熱交換器16で前記原料空気と熱交換を行い、熱回収された後に第1製品回収経路35から第1製品窒素ガスとして導出される(第1製品回収工程)。また、残部の第1窒素ガスは、経路36を通って第1凝縮器12に導入される。
Claims (5)
- 原料空気を深冷液化分離して製品窒素を採取する窒素製造方法において、圧縮、精製、冷却した原料空気を0.6MPa以上、1.1MPa以下の圧力で低温蒸留して第1窒素ガスと第1酸素富化液化流体とに分離する第1分離工程と、前記第1窒素ガスと減圧後の前記第1酸素富化液化流体とを間接熱交換させて第1窒素ガスを凝縮液化して第1液化窒素を得ると同時に第1酸素富化液化流体を蒸発ガス化して第1酸素富化ガス流体を得る第1間接熱交換工程と、前記第1酸素富化ガス流体を0.3MPa以上で、かつ、前記第1分離工程より低い圧力で低温蒸留して第2窒素ガスと第2酸素富化液化流体とに分離する第2分離工程と、前記第2窒素ガスと減圧後の前記第2酸素富化液化流体とを間接熱交換させて第2窒素ガスを凝縮液化して第2液化窒素を得ると同時に第2酸素富化液化流体を蒸発ガス化して第2酸素富化ガス流体を得る第2間接熱交換工程と、前記原料空気の一部を断熱膨張させることにより運転に必要な寒冷を発生させる寒冷発生工程と、該寒冷発生工程を経た原料空気を前記第2分離工程の中間段に導入する空気導入工程と、前記第1窒素ガスの一部を熱回収後に第1製品窒素ガスとして導出する第1製品回収工程と、前記第2窒素ガスの一部を熱回収後に第2製品窒素ガスとして導出する第2製品回収工程とを含むことを特徴とする窒素製造方法。
- 前記第2製品窒素ガスを圧縮する工程を含んでいることを特徴とする請求項1記載の窒素製造方法。
- 原料空気を深冷液化分離して製品窒素を採取する窒素製造装置において、圧縮、精製、冷却された原料空気を0.6MPa以上、1.1MPa以下の圧力で低温蒸留して塔上部の第1窒素ガスと塔底部の第1酸素富化液化流体とに分離する第1精留塔と、前記第1窒素ガスと減圧後の前記第1酸素富化液化流体とを間接熱交換させて第1窒素ガスを凝縮液化して第1液化窒素を得ると同時に第1酸素富化液化流体を蒸発ガス化して第1酸素富化ガス流体を得る第1凝縮器と、前記第1酸素富化ガス流体を0.3MPa以上で、かつ、前記第1精留塔より低い圧力で低温蒸留して塔上部の第2窒素ガスと塔底部の第2酸素富化液化流体とに精留分離する第2精留塔と、前記第2窒素ガスと減圧後の前記第2酸素富化液化流体とを間接熱交換させて第2窒素ガスを凝縮液化して第2液化窒素を得ると同時に第2酸素富化液化流体を蒸発ガス化して第2酸素富化ガス流体を得る第2凝縮器と、前記原料空気の一部を断熱膨張させて装置の運転に必要な寒冷を発生する膨張タービンと、前記膨張タービンを経た原料空気を前記第2精留塔の中間段に導入する空気導入経路と、前記第1窒素ガスの一部を熱回収後に第1製品窒素ガスとして導出する第1製品回収経路と、前記第2窒素ガスの一部を熱回収後に第2製品窒素ガスとして導出する第2製品回収経路とを備えていることを特徴とする窒素製造装置。
- 前記第2製品窒素ガスを圧縮する窒素圧縮機を備えていることを特徴とする請求項3記載の窒素製造装置。
- 前記第2精留塔は、装置外からの液化窒素を導入する液化窒素導入経路を備えていることを特徴とする請求項3又は4記載の窒素製造装置。
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JP2008162701A JP4841591B2 (ja) | 2008-06-23 | 2008-06-23 | 窒素製造方法及び装置 |
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JP2008162701A JP4841591B2 (ja) | 2008-06-23 | 2008-06-23 | 窒素製造方法及び装置 |
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JP2004323273A Division JP4515225B2 (ja) | 2004-11-08 | 2004-11-08 | 窒素製造方法及び装置 |
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JP5977572B2 (ja) * | 2012-04-25 | 2016-08-24 | 株式会社Ihi | 真空洗浄装置 |
CN104423405B (zh) * | 2013-09-11 | 2017-01-11 | 湖南华望熏蒸消毒有限公司 | 一种氮气气调控制系统及方法 |
JP6591830B2 (ja) * | 2015-08-20 | 2019-10-16 | 大陽日酸株式会社 | 窒素及び酸素製造方法、並びに窒素及び酸素製造装置 |
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JPS6454187A (en) * | 1987-08-25 | 1989-03-01 | Nippon Oxygen Co Ltd | Manufacture of nitrogen gas |
JP2920392B2 (ja) * | 1989-11-20 | 1999-07-19 | 日本酸素株式会社 | 空気液化分離装置における液化窒素の過冷却方法 |
GB9910701D0 (en) * | 1999-05-07 | 1999-07-07 | Boc Group Plc | Separation of air |
FR2800859B1 (fr) * | 1999-11-05 | 2001-12-28 | Air Liquide | Procede et appareil de separation d'air par distillation cryogenique |
JP3738213B2 (ja) * | 2001-11-19 | 2006-01-25 | 大陽日酸株式会社 | 窒素製造方法及び装置 |
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