JP2009529648A - 低温空気分離方法及び装置 - Google Patents
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- 238000000926 separation method Methods 0.000 title claims abstract description 35
- 230000006837 decompression Effects 0.000 claims abstract description 31
- 238000004821 distillation Methods 0.000 claims abstract description 23
- 229940110728 nitrogen / oxygen Drugs 0.000 claims abstract description 17
- 239000012263 liquid product Substances 0.000 claims abstract description 11
- 239000000047 product Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000000746 purification Methods 0.000 claims abstract 5
- 238000000034 method Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 claims 2
- 230000008016 vaporization Effects 0.000 claims 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 241000883306 Huso huso Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004887 air purification Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- PDEXVOWZLSWEJB-UHFFFAOYSA-N krypton xenon Chemical compound [Kr].[Xe] PDEXVOWZLSWEJB-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 150000002835 noble gases Chemical class 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Abstract
Description
ハウゼン/リンデ著「低温技術」第2版(1985年)第4章281〜337頁(Hausen/Linde, "Tieftemperaturtechnik", 2. Auflage 1985, Kapitel 4, Seiten 281 bis 337)
Claims (9)
- 少なくとも一基の分離塔(21, 22)を有する窒素・酸素分離用蒸留塔設備(20)を用いて空気を低温分離するに際し、
主たる装入空気流(1, 5)を空気圧縮機(2)で圧縮してから浄化装置(4)で浄化し、
浄化後の主たる空気流(5)から第1と第2の空気流(7, 8)を分流し、
第1の空気流(7)を直列接続された第1と第2の二基のアフターコンプレッサ(10, 13)で再圧縮し、
再圧縮後の第1の空気流(15)を間接熱交換器(16)で冷却して少なくとも一部を液化又は疑似的に液化してから窒素・酸素分離用蒸留塔設備(20)へ導入し、
第2の空気流(8)を間接熱交換器(16)で冷却してから二つの部分流(24, 27)に分流し、これら部分流をそれぞれ機械的出力の発生を伴う減圧膨張を行う互いにほぼ同じ入口圧力の別々の減圧膨張機(25, 28)に供給して機械的出力を取り出しながら減圧膨張させ、
これら第2の空気流の減圧膨張後の各部分流(26, 29)の少なくとも一部を窒素・酸素分離用蒸留塔設備(20)へ導入(30, 129)し、
第2の空気流の減圧膨張の際に各減圧膨張機(25, 28)から取り出される機械的出力の少なくとも一部を直列接続された前記2基のアフターコンプレッサ(10, 13)の駆動に用い、
窒素・酸素分離用蒸留塔設備(20)から取り出される液体製品流(31)を液体状態のまま更に加圧(32)して高圧液体製品流とし、この高圧液体製品流を加圧状態のまま前記間接熱交換器(16)による第1の空気流(15)との間接熱交換で加温して気化又は擬似的に気化することによって最終的に気体製品流(34)として取り出す形式の低温空気分離方法において、
二基のアフターコンプレッサ(10, 13)を、250K以上、又は特に270Kよりも高い入口温度で運転することを特徴とする低温空気分離方法。 - 窒素・酸素分離用蒸留塔設備(20)が高圧塔(21)と低圧塔(22)とを有することを特徴とする請求項1に記載の方法。
- 第2の空気流から分流された二つの部分流のうちの第1の部分流(26)の少なくとも一部を高圧塔(21)へ導入(30)することを特徴とする請求項2に記載の方法。
- 第2の空気流から分流された二つの部分流のうちの第2の部分流(29)の少なくとも一部をも高圧塔(21)へ導入(30)することを特徴とする請求項3に記載の方法。
- 第2の空気流から分流された二つの部分流のうちの第2の部分流の少なくとも一部を低圧塔(22)へ導入(129)することを特徴とする請求項2〜4のいずれか1項に記載の方法。
- 窒素・酸素分離用蒸留塔設備が高圧塔と中圧塔と低圧塔とを有し、第1の部分流の少なくとも一部を高圧塔へ導入し、第2の部分流の少なくとも一部を中圧塔又は低圧塔又はそれら双方へ導入することを特徴とする請求項1〜5のいずれか1項に記載の方法。
- 第1のアフターコンプレッサよりも上流側の第1の空気流と第2のアフターコンプレッサよりも下流側の第1の空気流とを関節熱交換器(9)で相互に間接熱交換させることを特徴とする請求項1〜6のいずれか1項に記載の方法。
- 第1のアフターコンプレッサのみ、又は第2のアフターコンプレッサのみ、又は両方のアフターコンプレッサがアフタークーラー(11, 14)を備えていることを特徴とする請求項1〜7のいずれか1項に記載の方法。
- 少なくとも一基の分離塔(21, 22)を有する窒素・酸素分離用蒸留塔設備(20)を用いて空気を低温分離するための空気低温分離装置であって、
主たる装入空気流(1)を圧縮するための空気圧縮機(2)と、
圧縮後の主たる装入空気流を浄化するための浄化装置(4)と、
−浄化後の主たる空気流(5)から第1と第2の空気流(7, 8)を分流する手段と、
第1の空気流(7)を再圧縮するための直列接続された二基のアフターコンプレッサ(10, 13)と、
再圧縮後の第1の空気流(15)を間接熱交換により冷却して液化又は疑似液化してから窒素・酸素分離用蒸留塔設備(20)へ導入するための手段(16)と、
第2の空気流(8)を間接熱交換(16)により中間温度まで冷却するための手段(16)と、
この冷却された第2の空気流から分流された二つの部分流(24, 27)をそれぞれ互いにほぼ同じ入口圧力で受け入れて個々に機械的出力を発生しながら減圧膨張させるように入口側で並列接続された二基の減圧膨張機(25, 28)と、
これら第2の空気流の減圧膨張(25, 28)後の各部分流(26, 29)を窒素・酸素分離用蒸留塔設備(20)に導入するための手段(26, 29, 30, 129)と、
第2の空気流の減圧膨張の際に各減圧膨張機(25, 28)から取り出される機械的出力を直列接続された前記2基のアフターコンプレッサ(10, 13)に伝達するための手段と、
窒素・酸素分離用蒸留塔設備(20)から液体製品流(31)を取り出し、該液体製品流を液体状態のまま更に加圧(32)して高圧液体製品流とし、この高圧液体製品流を加圧状態のまま第1の空気流(15)との間接熱交換で加温して気化又は擬似的に気化することによって気体製品流(34)として取り出す手段(31, 32, 33, 16, 34)を備えているものにおいて、
二基のアフターコンプレッサ(10, 13)の入口が、第1の空気流を250K以上、特に270Kよりも高い入口温度で供給する手段と接続されていることを特徴とする低温空気分離装置。
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US20090188280A1 (en) | 2009-07-30 |
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EP1994344A1 (de) | 2008-11-26 |
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