JP6875471B2 - 統合された窒素除去を有する天然ガス液化 - Google Patents
統合された窒素除去を有する天然ガス液化 Download PDFInfo
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- JP6875471B2 JP6875471B2 JP2019145043A JP2019145043A JP6875471B2 JP 6875471 B2 JP6875471 B2 JP 6875471B2 JP 2019145043 A JP2019145043 A JP 2019145043A JP 2019145043 A JP2019145043 A JP 2019145043A JP 6875471 B2 JP6875471 B2 JP 6875471B2
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- lng
- nitrogen
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- heat exchanger
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims description 197
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims description 152
- 229910052757 nitrogen Inorganic materials 0.000 title claims description 98
- 239000003345 natural gas Substances 0.000 title claims description 69
- 238000000034 method Methods 0.000 claims description 39
- 238000001816 cooling Methods 0.000 claims description 26
- 238000000926 separation method Methods 0.000 claims description 20
- 238000004064 recycling Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 16
- 239000003507 refrigerant Substances 0.000 claims description 15
- 238000007710 freezing Methods 0.000 claims description 13
- 230000008014 freezing Effects 0.000 claims description 13
- 238000009835 boiling Methods 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 7
- 239000013526 supercooled liquid Substances 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001307 helium Substances 0.000 claims description 4
- 229910052734 helium Inorganic materials 0.000 claims description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000008016 vaporization Effects 0.000 claims description 3
- 239000003949 liquefied natural gas Substances 0.000 description 86
- 238000010586 diagram Methods 0.000 description 8
- 238000012856 packing Methods 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/04—Recovery of liquid products
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Description
窒素を枯渇させたLNG生成物を生成する方法であって、
(a)主熱交換器の第1の回路を通して天然ガス供給流を通過させて、天然ガス供給流を冷却しかつ天然ガス流の少なくとも一部を第1の冷媒で液化し、それにより第1の冷却されたLNG流を生成することと、
(b)主熱交換器から第1の冷却されたLNG流を回収することと、
(c)第1の冷却されたLNG流を膨張させて、第1の減圧LNG流を形成することと、
(d)第1の減圧LNG流を第1の位置において窒素精留塔内に導入することであって、この第1の位置が窒素精留塔の底端に位置付けられている、導入することと、
(e)窒素精留塔の底端から第1のLNG底部流を回収することと、
(f)窒素精留塔から塔頂流を回収することと、
(g)第1のLNG底部流を冷却して、過冷却されたLNG流を生じさせることと、
(h)過冷却されたLNG流の少なくとも一部をフラッシュドラムまたはLNG貯蔵タンクに導くことと、
(i)フラッシュドラムからのフラッシュガス流およびLNG貯蔵タンクからのボイルオフガス流の群から選択される少なくとも一方を収集して、リサイクル流を形成することと、
(j)主熱交換器の第2の回路を通してリサイクル流を通過させて、リサイクル流を冷却しかつリサイクル流の少なくとも一部を液化し、それにより少なくとも部分的に液化したリサイクル流を生成することと、
(k)少なくとも部分的に液化したリサイクル流を膨張させて、減圧リサイクル流を形成することと、
(l)減圧リサイクル流を第2の位置において窒素精留塔内に導入することであって、この第2の位置が第1の位置の上方にあり、少なくとも1つの分離ステージが窒素精留塔内の第1の位置と第2の位置との間にある、導入することと、を含む、方法。
(m)過冷却された液体LNG流を使用して窒素精留塔に冷却デューティを提供すること、をさらに含む、態様1に記載の方法。
(n)工程(m)を実行する前に、過冷却された液体LNG流を少なくとも部分的に気化させること、をさらに含む、態様2に記載の方法。
(o)第1の冷媒を冷凍ループ内で圧縮および冷却することと、
(p)第1の冷媒のスリップ流を回収して窒素精留塔に冷却デューティを提供することと、をさらに含む、態様1〜3のいずれかに記載の方法。
(q)過冷却されたLNG流の少なくとも一部をフラッシュドラムに導くこと、をさらに含む、態様1〜4のいずれかに記載の方法。
(r)工程(j)を実行する前にリサイクル流を圧縮および冷却すること、をさらに含む、態様1〜5のいずれかに記載の方法。
(s)工程(b)を実行した後かつ工程(d)を実行する前に、窒素精留塔の底端からの再沸騰流に対する間接熱交換によって第1のLNG流をさらに冷却し、それにより暖められた再沸騰流を生成することと、
(t)暖められた再沸騰流を窒素精留塔の底端内に導入することと、をさらに含む、態様1〜6のいずれかに記載の方法。
工程(h)が、過冷却された液体LNG流を、窒素ストリッパ塔内で液体LNG生成物流と蒸気LNG生成物流とに分離することをさらに含み、
(u)窒素精留塔の上端から窒素を富化した蒸気流を回収し、窒素ストリッパ塔内に位置付けられた凝縮器熱交換器を通してこの窒素を富化した蒸気流を通過させて、窒素ストリッパ塔に沸騰デューティを提供し、それにより少なくとも部分的に液化した窒素を富化した流れを生成することと、
(v)この少なくとも部分的に液化した窒素を富化した流れを窒素精留塔の上端に戻すことと、をさらに含む、態様1〜7のいずれかに記載の方法。
(w)塔頂熱交換器内で塔頂流をさらに冷却し、さらに冷却された塔頂流を、窒素を富化した流れと水素/ヘリウムを富化した流れとに分離することと、
(x)窒素を富化した流れを膨張させ、膨張した窒素を富化した流れを使用して塔頂熱交換器に冷凍デューティを提供することと、をさらに含む、態様1〜8のいずれかに記載の方法。
(y)圧力スイング吸着または膜ユニットを使用して、塔頂流を、窒素を富化した流れと水素/ヘリウムを富化した流れとに分離すること、をさらに含む、態様1〜9のいずれかに記載の方法。
(z)過冷却されたLNG流をLNG生成物流と蒸気NG生成物流とに分離することをさらに含み、
工程(i)が、LNG生成物流をLNG貯蔵タンクに導くことをさらに含む、態様1〜10のいずれかに記載の方法。
(aa)ボイルオフガス流を蒸気NG生成物流と混合してリサイクル流を形成すること、をさらに含む、態様11に記載の方法。
工程(d)が、第1の減圧LNG流を第1の位置において窒素精留塔内に導入することを含み、この第1の位置が、窒素精留塔内に位置付けられた任意の分離ステージの下方に位置付けられている、態様1〜12のいずれかに記載の方法。
(ab)天然ガス供給流からのスリップ流を窒素精留塔の底端に導くこと、をさらに含む、態様1〜13のいずれかに記載の方法。
窒素を枯渇させたLNG生成物を生成する装置であって、
天然ガス供給流を受け、熱交換器を通して上記流を通過させて天然ガス供給流を冷却し、第1のLNG流および過冷却されたLNG流を生成するように、天然ガス供給流の少なくとも一部を液化するための第1のセットの冷却通路を有する主熱交換器であって、主熱交換器が、リサイクル流を受け、主熱交換器を通してリサイクル流を通過させてリサイクル流を冷却し、少なくとも部分的に液化して、第1の少なくとも部分的に液化したリサイクル流を生成するための第2のセットの通路をさらに含み、この冷却通路が、天然ガス供給流とは別にかつ天然ガス供給流と平行に熱交換器を通してリサイクル流を通過させるように配置されている、主熱交換器と、
第1および第2のセットの冷却通路を冷却するために主熱交換器に冷媒を供給するための冷凍システムと、
第1のLNG流、または第1のLNG流の一部から形成されたLNG流を受け、膨張させ、部分的に気化し、分離して底部流および塔頂流を形成するための、主熱交換器と流体流連通状態にある第1の分離システムであって、リサイクル流入口と、リサイクル流入口の上方に位置付けられたLNG流入口とを含み、かつリサイクル流入口とLNG流入口との間に位置付けられた少なくとも1つの分離ステージをさらに含む、第1の分離システムと、
過冷却されたLNG流を受けて貯蔵するための貯蔵タンクであって、リサイクル流と流体流連通状態にある、貯蔵タンクと、を備え、
底部流が、底部流を過冷却して過冷却されたLNG流を形成するように動作上構成された主熱交換器の冷たい管束内で第1のセットの通路と流体流連通状態にある、装置。
貯蔵タンクからのリサイクル流を受け、このリサイクル流を圧縮して圧縮されたリサイクル流を形成し、圧縮されたリサイクル流を主熱交換器に戻すための圧縮機をさらに備える、態様15に記載のシステム。
第1の分離システムが、過冷却されたLNG流を使用して第1の分離システムに凝縮デューティを提供するように適合された凝縮器熱交換器をさらに備える、態様15および16のいずれかに記載のシステム。
凝縮器熱交換器の下流かつ貯蔵タンクの上流に位置付けられたフラッシュドラムをさらに備える、態様17に記載のシステム。
Claims (17)
- 窒素を枯渇させたLNG生成物を生成する方法であって、
(a)主熱交換器の第1の回路を通して天然ガス供給流を通過させて、前記天然ガス供給流を冷却しかつ前記天然ガス流の少なくとも一部を第1の冷媒で液化し、それにより第1の冷却されたLNG流を生成することと、
(b)前記主熱交換器から前記第1の冷却されたLNG流を回収することと、
(c)前記第1の冷却されたLNG流を膨張させて、第1の減圧LNG流を形成することと、
(d)前記第1の減圧LNG流を第1の位置において窒素精留塔内に導入することであって、前記第1の位置が前記窒素精留塔の底端に位置付けられている、導入することと、
(e)前記窒素精留塔の前記底端から第1のLNG底部流を回収することと、
(f)前記窒素精留塔から塔頂流を回収することと、
(g)前記第1のLNG底部流を冷却して、過冷却されたLNG流を生じさせることと、
(h)前記過冷却されたLNG流の少なくとも一部をフラッシュドラムまたはLNG貯蔵タンクに導くことと、
(i)前記フラッシュドラムからのフラッシュガス流および前記LNG貯蔵タンクからのボイルオフガス流の群から選択される少なくとも一方を収集して、リサイクル流を形成することと、
(j)前記主熱交換器の第2の回路を通して前記リサイクル流を通過させて、前記リサイクル流を冷却しかつ前記リサイクル流の少なくとも一部を液化し、それにより少なくとも部分的に液化したリサイクル流を生成することと、
(k)前記少なくとも部分的に液化したリサイクル流を膨張させて、減圧リサイクル流を形成することと、
(l)前記減圧リサイクル流を第2の位置において前記窒素精留塔内に導入することであって、前記第2の位置が前記第1の位置の上方にあり、少なくとも1つの分離ステージが前記窒素精留塔内の前記第1の位置と前記第2の位置との間にある、導入することと、を含み、
工程(h)が、前記過冷却された液体LNG流を、窒素ストリッパ塔内で液体LNG生成物流と蒸気LNG生成物流とに分離することをさらに含み、
(u)前記窒素精留塔の上端から窒素を富化した蒸気流を回収し、前記窒素ストリッパ塔内に位置付けられた凝縮器熱交換器を通して前記窒素を富化した蒸気流を通過させて前記窒素ストリッパ塔に沸騰デューティを提供し、それにより少なくとも部分的に液化した窒素を富化した流れを生成することと、
(v)前記少なくとも部分的に液化した窒素を富化した流れを前記窒素精留塔の前記上端に戻すことと、をさらに含む、
方法。 - (m)前記過冷却された液体LNG流を使用して前記窒素精留塔に冷却デューティを提供すること、をさらに含む、請求項1に記載の方法。
- (n)工程(m)を実行する前に、前記過冷却された液体LNG流を少なくとも部分的に気化させること、をさらに含む、請求項2に記載の方法。
- (o)前記第1の冷媒を冷凍ループ内で圧縮および冷却することと、
(p)前記第1の冷媒のスリップ流を回収して前記窒素精留塔に冷却デューティを提供することと、をさらに含む、請求項1に記載の方法。 - (q)前記過冷却されたLNG流の少なくとも一部をフラッシュドラムに導くこと、をさらに含む、請求項1に記載の方法。
- (r)工程(j)を実行する前に前記リサイクル流を圧縮および冷却すること、をさらに含む、請求項1に記載の方法。
- (s)工程(b)を実行した後かつ工程(d)を実行する前に、前記窒素精留塔の前記底端からの再沸騰流に対する間接熱交換によって前記第1のLNG流をさらに冷却し、それにより暖められた再沸騰流を生成することと、
(t)前記暖められた再沸騰流を前記窒素精留塔の前記底端内に導入することと、をさらに含む、請求項1に記載の方法。 - (w)塔頂熱交換器内で前記塔頂流をさらに冷却し、さらに冷却された塔頂流を、窒素を富化した流れと水素/ヘリウムを富化した流れとに分離することと、
(x)窒素を富化した流れを膨張させ、前記膨張した窒素を富化した流れを使用して前記塔頂熱交換器に冷凍デューティを提供することと、をさらに含む、請求項1に記載の方法。 - (y)圧力スイング吸着または膜ユニットを使用して、前記塔頂流を、窒素を富化した流れと水素/ヘリウムを富化した流れとに分離すること、をさらに含む、請求項1に記載の方法。
- (z)前記過冷却されたLNG流をLNG生成物流と蒸気NG生成物流とに分離することをさらに含み、
工程(i)が、前記LNG生成物流を前記LNG貯蔵タンクに導くことをさらに含む、請求項1に記載の方法。 - (aa)前記ボイルオフガス流を前記蒸気NG生成物流と混合して前記リサイクル流を形成すること、をさらに含む、請求項10に記載の方法。
- 工程(d)が、前記第1の減圧LNG流を前記第1の位置において前記窒素精留塔内に導入することを含み、前記第1の位置が、前記窒素精留塔内に位置付けられた任意の分離ステージの下方に位置付けられている、請求項1に記載の方法。
- (ab)前記天然ガス供給流からのスリップ流を前記窒素精留塔の前記底端に導くこと、をさらに含む、請求項1に記載の方法。
- 窒素を枯渇させたLNG生成物を生成するための装置であって、
天然ガス供給流を受け、熱交換器を通して前記流を通過させて前記天然ガス供給流を冷却し、第1のLNG流および過冷却されたLNG流を生成するように、前記天然ガス供給流の少なくとも一部を液化するための第1のセットの冷却通路を有する主熱交換器であって、前記主熱交換器が、リサイクル流を受け、前記主熱交換器を通して前記リサイクル流を通過させて前記リサイクル流を冷却し、少なくとも部分的に液化して、第1の少なくとも部分的に液化したリサイクル流を生成するための第2のセットの通路をさらに含み、前記冷却通路が、前記天然ガス供給流とは別にかつ前記天然ガス供給流と平行に前記熱交換器を通して前記リサイクル流を通過させるように配置されている、主熱交換器と、
前記第1および第2のセットの冷却通路を冷却するために前記主熱交換器に冷媒を供給するための冷凍システムと、
前記第1のLNG流、または前記第1のLNG流の一部から形成されたLNG流を受け、膨張させ、部分的に気化し、分離して底部流および塔頂流を形成するための、前記主熱交換器と流体流連通状態にある第1の分離システムであって、リサイクル流入口と、前記リサイクル流入口の上方に位置付けられたLNG流入口とを含み、かつ前記リサイクル流入口と前記LNG流入口との間に位置付けられた少なくとも1つの分離ステージをさらに含む、第1の分離システムと、
前記過冷却されたLNG流を受けて貯蔵するための貯蔵タンクであって、前記リサイクル流と流体流連通状態にある、貯蔵タンクと、
窒素ストリッパ塔と、
を備え、
前記底部流が、前記底部流を過冷却して前記過冷却されたLNG流を形成するように動作上構成された前記主熱交換器の冷たい管束内で前記第1のセットの通路と流体流連通状態にあり、
前記過冷却された液体LNG流が、前記窒素ストリッパ塔内で液体LNG生成物流と蒸気LNG生成物流とに分離される、
装置。 - 前記貯蔵タンクからの前記リサイクル流を受け、前記リサイクル流を圧縮して圧縮されたリサイクル流を形成し、前記圧縮されたリサイクル流を前記主熱交換器に戻すための圧縮機をさらに備える、請求項14に記載のシステム。
- 前記第1の分離システムが、前記過冷却されたLNG流を使用して前記第1の分離システムに凝縮デューティを提供するように適合された凝縮器熱交換器をさらに備える、請求項14に記載のシステム。
- 前記凝縮器熱交換器の下流かつ前記貯蔵タンクの上流に位置付けられたフラッシュドラムをさらに備える、請求項16に記載のシステム。
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