JP2006284075A - 空気分離方法および空気分離装置 - Google Patents
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- 238000000034 method Methods 0.000 title abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 178
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 129
- 239000001301 oxygen Substances 0.000 claims abstract description 129
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 129
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000000203 mixture Substances 0.000 claims abstract description 77
- 238000000926 separation method Methods 0.000 claims abstract description 66
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 62
- 239000007789 gas Substances 0.000 claims abstract description 59
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 49
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 7
- 238000001704 evaporation Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
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- 238000010438 heat treatment Methods 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 238000010992 reflux Methods 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
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- 239000006200 vaporizer Substances 0.000 description 1
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- F25J2210/00—Processes characterised by the type or other details of the feed stream
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- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/42—Nitrogen
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- 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
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- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
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Abstract
【解決手段】 高圧塔5で原料空気を窒素ガス流体と第1酸素富化液化流体とに分離する第1分離工程と、補助塔7で第1酸素富化液化流体を空気組成流体と第2酸素富化液化流体とに分離する第2分離工程と、補助塔7下部の凝縮器12における窒素ガス流体と第2酸素富化液化流体との第1間接熱交換工程と、低圧塔20で第2酸素富化ガス流体を第3酸素富化ガス流体と液化酸素とに分離する第3分離工程と、空気昇圧機51における空気組成流体の圧縮工程と、低圧塔20下部の蒸化器21における空気組成流体と液化酸素との第2間接熱交換工程と、製品窒素ガス回収工程と、製品酸素ガス回収工程とを含む空気分離方法。
【選択図】 図1
Description
請求項1にかかる発明は、原料空気を深冷液化分離して、中圧製品窒素ガスと中圧製品酸素ガスとを採取する空気分離方法において、圧縮、精製、冷却した前記原料空気を高圧塔に導入し、塔上部の窒素ガス流体と、塔下部の第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酸素富化液化流体を補助塔に導入し、塔上部の酸素組成がほぼ空気と同じである空気組成流体と、塔下部の第2酸素富化液化流体とに分離する第2分離工程と、前記窒素ガス流体の一部と、前記第2酸素富化液化流体とを間接熱交換して、前記窒素ガス流体を凝縮して液化窒素にすると同時に、前記第2酸素富化液化流体を蒸発して第2酸素富化ガス流体にする第1間接熱交換工程と、前記第2酸素富化ガス流体の一部を低圧塔に導入し、塔上部の第3酸素富化ガス流体と、塔下部の液化酸素とに分離する第3分離工程と、前記酸素組成がほぼ空気と同じである空気組成流体を昇圧する圧縮工程と、昇圧した前記酸素組成がほぼ空気と同じである空気組成流体と、前記液化酸素とを間接熱交換して、前記酸素組成がほぼ空気と同じである空気組成流体を凝縮して液化空気組成流体にすると同時に、前記液化酸素を蒸発して酸素ガス流体にする第2間接熱交換工程と、前記窒素ガス流体の残部を、熱回収後に前記中圧製品窒素ガスとして導出する製品窒素ガス回収工程と、前記酸素ガス流体を、熱回収後に前記中圧製品酸素ガスとして導出する製品酸素ガス回収工程とを含むことを特徴とする空気分離方法である。
低圧塔(20)の運転圧力を0.3MPa(3bar)とすると、低圧塔底部の酸素流体の飽和温度は約102Kである。蒸化器(21)に必要な温度差を2Kとすると、蒸化器(21)の加熱源に必要な飽和温度は、約104Kである。蒸化器(21)の加熱源に空気組成流体を用いた場合、その飽和温度から、その圧力は約0.85MPaである必要がある。
図1に示した空気分離装置(70)を用いて、窒素ガスと酸素ガスを生産した。フィルタ(図示略)によって粉塵等を除去した原料空気3630Nm3/hを、原料空気圧縮機(1)で約0.73MPa(7.3bar)まで圧縮した後、吸着器(2,2)で水分、二酸化炭素を除去した。主熱交換器(3)で露点近くまで冷却し、高圧塔(5)下部に導入した。
4 原料空気導入管路
5 高圧塔
6 製品窒素ガス採取管路
7 補助塔
11 凝縮器への窒素ガス流体導入管路
12 凝縮器
13 高圧塔への液化窒素導入管路
14 補助塔への第1酸素富化液化流体導入管路
15,18 低圧塔への第2酸素富化ガス流体導入管路
17,31 空気昇圧機への空気組成流体導入管路
19 製品酸素ガス採取管路
20 低圧塔
21 蒸化器
32 蒸化器への空気組成流体導入管路
33 低圧塔への液化空気組成流体導入管路
45 空気分離装置外からの液化ガス導入管路
51 空気昇圧機
70 空気分離装置
Claims (4)
- 原料空気を深冷液化分離して、中圧製品窒素ガスと中圧製品酸素ガスとを採取する空気分離方法において、
圧縮、精製、冷却した前記原料空気を高圧塔に導入し、塔上部の窒素ガス流体と、塔下部の第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酸素富化液化流体を補助塔に導入し、塔上部の酸素組成がほぼ空気と同じである空気組成流体と、塔下部の第2酸素富化液化流体とに分離する第2分離工程と、
前記窒素ガス流体の一部と、前記第2酸素富化液化流体とを間接熱交換して、前記窒素ガス流体を凝縮して液化窒素にすると同時に、前記第2酸素富化液化流体を蒸発して第2酸素富化ガス流体にする第1間接熱交換工程と、
前記第2酸素富化ガス流体の一部を低圧塔に導入し、塔上部の第3酸素富化ガス流体と、塔下部の液化酸素とに分離する第3分離工程と、
前記酸素組成がほぼ空気と同じである空気組成流体を昇圧する圧縮工程と、
昇圧した前記酸素組成がほぼ空気と同じである空気組成流体と、前記液化酸素とを間接熱交換して、前記酸素組成がほぼ空気と同じである空気組成流体を凝縮して液化空気組成流体にすると同時に、前記液化酸素を蒸発して酸素ガス流体にする第2間接熱交換工程と、
前記窒素ガス流体の残部を、熱回収後に前記中圧製品窒素ガスとして導出する製品窒素ガス回収工程と、
前記酸素ガス流体を、熱回収後に前記中圧製品酸素ガスとして導出する製品酸素ガス回収工程とを含むことを特徴とする空気分離方法。 - 系外から液化ガスを導入して装置に必要な寒冷を補給するものである請求項1に記載の空気分離方法。
- 原料空気を深冷液化分離して、中圧製品窒素ガスと中圧製品酸素ガスとを採取する空気分離装置(70)であって、
圧縮、精製した前記原料空気と製品ガスとを熱交換して、前記原料空気を冷却する主熱交換器(3)と、
前記主熱交換器(3)で冷却した前記原料空気を、高圧塔(5)下部に導入する管路(4)と、
この原料空気を、窒素ガス流体と第1酸素富化液化流体とに分離する高圧塔(5)と、
前記高圧塔(5)塔下部の前記第1酸素富化液化流体を、補助塔(7)上部に導入する管路(14)と、
前記第1酸素富化液化流体を、酸素組成がほぼ空気と同じである空気組成流体と第2酸素富化液化流体とに分離する補助塔(7)と、
前記高圧塔(5)上部から導出した前記窒素ガス流体の一部を、凝縮器(12)に導入する管路(11)と、
前記窒素ガス流体の一部と前記第2酸素富化液化流体とを間接熱交換する、前記補助塔(7)下部に設けられた凝縮器(12)と、
この窒素ガス流体を前記凝縮器(12)で間接熱交換して液化窒素にした後、前記高圧塔(5)上部に導入する管路(13)と、
前記第2酸素富化液化流体を間接熱交換で蒸発して得た第2酸素富化ガス流体の一部を低圧塔(20)に導入する管路(15,18)と、
前記第2酸素富化ガス流体を、第3酸素富化ガス流体と液化酸素とに分離する低圧塔(20)と、
前記補助塔(7)塔上部から導出した前記酸素組成がほぼ空気と同じである空気組成流体を、空気昇圧機(51)に導入する管路(17,31)と、
前記酸素組成がほぼ空気と同じである空気組成流体を昇圧する空気昇圧機(51)と、
前記空気昇圧機(51)で昇圧した前記酸素組成がほぼ空気と同じである空気組成流体を、蒸化器(21)に導入する管路(32)と、
昇圧した前記酸素組成がほぼ空気と同じである空気組成流体と前記液化酸素とを間接熱交換する、前記低圧塔(20)下部に設けられた蒸化器(21)と、
前記酸素組成がほぼ空気と同じである空気組成流体を間接熱交換して得た液化空気組成流体を、前記低圧塔(20)上部に導入する管路(33)と、
前記窒素ガス流体の残部を、前記高圧塔(5)上部から導出し、前記中圧製品窒素ガスとして採取する管路(6)と、
酸素ガス流体を、前記低圧塔(20)下部から導出し、前記中圧製品酸素ガスとして採取する管路(19)とを設けたことを特徴とする空気分離装置。 - 前記空気分離装置(70)外からの液化ガスを導入する液化ガス導入管路(45)を設けた請求項3に記載の空気分離装置。
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JP2010159890A (ja) * | 2009-01-06 | 2010-07-22 | Taiyo Nippon Sanso Corp | 空気分離方法及び装置 |
JP2010286216A (ja) * | 2009-06-15 | 2010-12-24 | Taiyo Nippon Sanso Corp | 空気分離方法及び装置 |
JP2011185448A (ja) * | 2010-03-04 | 2011-09-22 | Taiyo Nippon Sanso Corp | 窒素及び酸素の製造方法並びに窒素及び酸素の製造装置。 |
CN103620330A (zh) * | 2011-06-28 | 2014-03-05 | 大阳日酸株式会社 | 空气分离方法和装置 |
CN112984955A (zh) * | 2021-03-15 | 2021-06-18 | 鞍钢股份有限公司 | 一种空分设备板翅式换热器的启动方法 |
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JP2010159890A (ja) * | 2009-01-06 | 2010-07-22 | Taiyo Nippon Sanso Corp | 空気分離方法及び装置 |
JP2010286216A (ja) * | 2009-06-15 | 2010-12-24 | Taiyo Nippon Sanso Corp | 空気分離方法及び装置 |
JP2011185448A (ja) * | 2010-03-04 | 2011-09-22 | Taiyo Nippon Sanso Corp | 窒素及び酸素の製造方法並びに窒素及び酸素の製造装置。 |
CN103620330A (zh) * | 2011-06-28 | 2014-03-05 | 大阳日酸株式会社 | 空气分离方法和装置 |
CN112984955A (zh) * | 2021-03-15 | 2021-06-18 | 鞍钢股份有限公司 | 一种空分设备板翅式换热器的启动方法 |
CN112984955B (zh) * | 2021-03-15 | 2022-05-20 | 鞍钢股份有限公司 | 一种空分设备板翅式换热器的启动方法 |
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