JP5241707B2 - 蒸気を再液化するための方法と装置 - Google Patents
蒸気を再液化するための方法と装置 Download PDFInfo
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- JP5241707B2 JP5241707B2 JP2009511608A JP2009511608A JP5241707B2 JP 5241707 B2 JP5241707 B2 JP 5241707B2 JP 2009511608 A JP2009511608 A JP 2009511608A JP 2009511608 A JP2009511608 A JP 2009511608A JP 5241707 B2 JP5241707 B2 JP 5241707B2
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- working fluid
- natural gas
- heat exchanger
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- vapor
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
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- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
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- F25J2245/02—Recycle of a stream in general, e.g. a by-pass stream
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- Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Ocean & Marine Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Separation By Low-Temperature Treatments (AREA)
Description
EP−A−1,132,698号による方法では、ボイルオフ蒸気及び/又は天然ガス凝縮液は、貯蔵部から取られた液化天然ガスと混合される。
前記貯蔵タンクが液化天然ガスを満積している時は、凝縮器は、過冷却された液化天然ガスがそこから出ていくように運転されるのが望ましい。但し、時として、前記貯蔵タンクに比較的少ない量の液化天然ガスしか入っていない時に、凝縮液を貯蔵タンクへ戻すことには、ボイルオフ蒸気の窒素含有率を上昇させる効果がある。その結果、凝縮させるために凝縮器に提供された蒸気は、過剰に窒素を含有することになるので、必然的に、凝縮液は過冷却されないのみならず、完全に凝縮されることすら危ぶまれる。その様な状況では、或いは、貯蔵タンクに、高窒素濃度を有する液化天然ガス、例えば、20乃至40体積%の窒素を含有するボイルオフガスを出す濃度の液化天然ガス、が入っている場合は、未凝縮蒸気を含んでいる凝縮液は相分離器に流し込まれ、得られた液相は貯蔵タンクに戻され、また、得られた気相は船舶のエンジンに送られる(エンジンが天然ガスによって駆動されている場合の船上使用の事例)か、又は燃焼されて大気中に放出される。
第1蒸気圧縮ステージの上流の蒸気は、凝縮器から取られた、凝縮された天然ガス流と混合させることによって予冷却されるのが望ましい。凝縮された天然ガス蒸気流の流量は、第1圧縮ステージへの入口の温度に応じて制御されるのが望ましい。
図は縮尺を合わせていない。
図を参照すると、5基の断熱貯蔵タンク2、4、6、8、10が、船舶又は他の外洋航行船の船体(図示せず)に設けられている。貯蔵タンク2、4、6、8、10の内の2基又はそれ以上には、その底領域に位置して没液オリフィス管12が設けられており、この管を通して、LNGが導入される。例示説明を分かり易くするために、タンク2、4、6のオリフィス管は、図に示していない。貯蔵タンクの内、数基にしか没液オリフィス管が設けられていない場合、設けられていないタンクに戻されるLNGの再配給は、液体ポンプ(図示せず)の運転によって行われる。オリフィス管12は、通常運転時には、或る量のLNG16中に没液している。タンク2、4、6、8、10のそれぞれには、その中の上記量のLNG16の上方に蒸気空間18が存在している。
得られた、圧縮されたガスは、第2圧縮ステージ42から、一般的には板状フィン又は渦巻き型の熱交換器の形態をした凝縮器46に供給され、そこで凝縮され、一旦凝縮された後に過冷却を受ける。得られた、過冷却された凝縮液は、凝縮器46からパイプライン48に沿って凝縮液戻り用管寄せ50に流れ、そこからタンク8と10の底領域のオリフィス管12に給送され、又は各タンクにオリフィス管12が装備されている場合は、タンク2、4、6、8、10に送給される。
ブレイトンサイクル60内では、凝縮器46を通って出てきた窒素は、気体対気体熱交換器62内で、第1圧力よりも高い第2圧力の戻って来た圧縮窒素との熱交換で加温される。得られた、加温された窒素は、圧縮器64に流れるが、この圧縮器64は、通常、3つの圧縮ステージ66、68、70を備えていて、それら全てのステージが、ギヤボックス75を介してモーター74によって駆動される一体型ギヤボックス(図示せず)又は同じシャフト72上に搭載されたローター(図示せず)を有している。第1圧縮ステージ66からの出口の下流で、第2圧縮ステージ68への入口の上流に、第1中間冷却器78が設置されている。第2圧縮ステージ68からの出口の下流で、第3圧縮ステージ70への入口の上流に、第2中間冷却器80が設置されている。第3圧縮ステージ70からの出口の下流に、後段冷却器82が設置されている。中間冷却器78と80並びに後段冷却器82は、通常、全て水によって冷却され、ブレイトンサイクルの運転中に循環している窒素から圧縮熱を奪う働きをする。得られた、後段冷却された圧縮窒素の流れは、先に説明した戻りの冷窒素流として、熱交換器63を通過して流れる。圧縮された窒素流は、こうして、熱交換器62内で、より低い温度に冷却される。圧縮され冷却された窒素の流れは、膨張タービン84に通され、ここで、膨張して、追加の仕事を行う。膨張タービン84は、通常は、圧縮ステージ66、68、70と同じ一体型ギヤボックス(図示せず)又は同じシャフト上に搭載されている。膨張タービン84は、この様に、圧縮ステージ66、68、70の駆動を支援している。タービン84内の窒素の膨張により、凝縮器46内の天然ガス蒸気の凝縮に必要な冷凍作用が生まれる。窒素は、こうして、継続的に無限回路を通る。
Claims (11)
- 少なくとも1つの貯蔵タンク内に保持されている少なくとも或る量の液化天然ガスからボイルオフした蒸気を再液化する方法であって、
蒸気を、直列の第1及び第2蒸気圧縮ステージで圧縮する段階と、
前記圧縮された蒸気を、凝縮器内で、主無限冷凍サイクル内を流れている作動流体との熱交換によって凝縮する段階と、
得られた凝縮液の少なくとも一部を、前記貯蔵タンクに戻す段階と、を有し、
前記主作動流体サイクルでは、前記作動流体は、順に、少なくとも1つの作動流体圧縮器内で圧縮され、第1熱交換器内で冷却され、天然ガス蒸気の凝縮を行うために前記凝縮器内に採用されている膨張タービン内で膨張され、前記第1熱交換器内で、冷却される作動流との熱交換で加温され、前記作動流体圧縮器に戻される、方法において、
前記主作動流体サイクル内の、前記作動流体が前記凝縮器を通る通路と前記第1熱交換器を通る通路の中間で、前記作動流体は、第2熱交換器内で、前記第2蒸気圧縮ステージの下流で且つ前記凝縮器の上流にある前記圧縮された天然ガス蒸気を予冷却するのに用いられていること、及び、前記作動流体の流れの一部は、前記主作動流体サイクル内の、前記作動流体が前記凝縮器から前記第2熱交換器に流れている領域から迂回されて、前記第1蒸気圧縮ステージと前記第2蒸気圧縮ステージの中間で前記天然ガス蒸気を冷却するように少なくとも1つの第3熱交換器を通され、前記迂回された作動流体は、前記作動流体が前記第2熱交換器から前記第1熱交換器に流れている領域で前記主作動流体サイクルに戻されること、を特徴とする方法。 - 前記主作動流体サイクルから前記第3熱交換機に迂回される前記作動流体の比率は、前記第2蒸気圧縮ステージへの入口の温度に応じて制御される、請求項1に記載の方法。
- 前記貯蔵タンクが液化天然ガスを満載している時、前記凝縮器は、過冷却された液化天然ガスがそこから出て行くように運転される、請求項1又は2に記載の方法。
- 前記第1蒸気圧縮ステージの上流の前記蒸気は、前記凝縮器から取られた、凝縮された天然ガス流と混合させることにより予冷却される、請求項1乃至3の何れか1項に記載の方法。
- 前記凝縮された蒸気流の流量は、前記第1圧縮ステージへの入口の温度に応じて制御される、請求項4に記載の方法。
- 天然ガス蒸気を再液化するための装置であって、
少なくとも或る量の液化天然ガスを保持するための少なくとも1つの貯蔵タンクと、
前記貯蔵タンク内の少なくとも1つの蒸気空間と連通していて、ボイルオフした天然ガス蒸気を圧縮するための直列の第1及び第2蒸気圧縮ステージと、
前記第2蒸気圧縮ステージと連通している天然ガス入口と前記貯蔵タンクと連通している出口とを有している、圧縮された前記蒸気を凝縮するための凝縮器と、を備えており、
前記凝縮器は、使用中、前記作動流体によって冷却されるように配置されており、前記凝縮器は、順に、(a)前記作動流体の流れを圧縮するための少なくとも1つの作動流体圧縮器と、(b)前記作動流体の流れを冷却するための、第1熱交換器を通る冷却経路と、(c)前記作動流体の流れを膨張させるための膨張タービンと、(d)前記凝縮器と、(e)前記作動流体を加温するための、前記第1熱交換器を通る加温経路と、(f)前記作動流体圧縮器への入口と、を備えている無限の主作動流体サイクルの一部を形成している、装置において、
前記主作動流体サイクルは、前記天然ガスを前記作動流体との熱交換によって冷却するための第2熱交換器であって、前記第2蒸気圧縮ステージと前記凝縮器の中間で、その中を通っている天然ガス蒸気経路と、前記凝縮器からの作動流体出口と前記第1熱交換器を通る前記加温経路への入口の中間で、その中を通っている作動流体経路とを有している、第2熱交換器を備えていることと、
前記第1天然ガス蒸気圧縮ステージと前記第2天然ガス蒸気圧縮ステージの中間で前記天然ガス蒸気を、前記主作動流体サイクルから迂回させた作動流体との熱交換によって冷却するための第3熱交換器であって、入口側は、前記作動流体サイクル内の、前記凝縮器からの作動流体出口と前記第2熱交換器への作動流体入口の中間の領域と連通し、出口側は、前記作動流体サイクル内の、前記第2熱交換器からの作動流体出口と前記第1熱交換器を通る加温経路への入口の中間の領域と連通している、その中を通っている作動流体経路を有している第3熱交換器が設けられていること、を特徴とする装置。 - 前記主作動流体サイクルから前記第3熱交換器へ迂回される前記作動流体の比率を、前記第2蒸気圧縮ステージへの入り口の温度に応じて制御するための弁が設けられている、請求項6に記載の装置。
- 前記第1及び第2蒸気圧縮ステージは、単一の多段速モーターで駆動されている、請求項6又は7に記載の装置。
- 前記第1蒸気圧縮ステージの上流に、前記天然ガス蒸気を冷却することができる混合器を追加的に含んでおり、前記混合器は、前記凝縮器と連通している、凝縮された天然ガス用の入口を有している、請求項6から8の何れか1項に記載の装置。
- 前記混合器への凝縮液の流れを制御するための弁であって、前記第1圧縮ステージへの入口の温度を一定に維持する働きをする弁を含んでいる、請求項9に記載の装置。
- 前記凝縮器からの凝縮液用出口は、液体を前記貯蔵タンクに戻すための出口と蒸気を燃焼ユニットに送るための出口を有する相分離器と連通している膨張弁を経由させて設置することが選択的に可能である、請求項6から10の何れか1項に記載の装置。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06352012A EP1860393B1 (en) | 2006-05-23 | 2006-05-23 | Method and apparatus for the reliquefaction of a vapour |
| EP06352012.6 | 2006-05-23 | ||
| PCT/IB2007/002771 WO2007144774A2 (en) | 2006-05-23 | 2007-05-23 | Method and apparatus for the reliquefaction of a vapour |
Publications (2)
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| JP2009538405A JP2009538405A (ja) | 2009-11-05 |
| JP5241707B2 true JP5241707B2 (ja) | 2013-07-17 |
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| JP2009511608A Expired - Fee Related JP5241707B2 (ja) | 2006-05-23 | 2007-05-23 | 蒸気を再液化するための方法と装置 |
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| Country | Link |
|---|---|
| US (1) | US20100000253A1 (ja) |
| EP (2) | EP1860393B1 (ja) |
| JP (1) | JP5241707B2 (ja) |
| KR (1) | KR101419069B1 (ja) |
| CN (1) | CN101495828B (ja) |
| AT (1) | ATE423298T1 (ja) |
| DE (1) | DE602006005229D1 (ja) |
| WO (1) | WO2007144774A2 (ja) |
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2006
- 2006-05-23 EP EP06352012A patent/EP1860393B1/en not_active Not-in-force
- 2006-05-23 AT AT06352012T patent/ATE423298T1/de not_active IP Right Cessation
- 2006-05-23 DE DE602006005229T patent/DE602006005229D1/de not_active Expired - Fee Related
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2007
- 2007-05-23 EP EP07804964A patent/EP2024698A2/en not_active Withdrawn
- 2007-05-23 US US12/301,057 patent/US20100000253A1/en not_active Abandoned
- 2007-05-23 KR KR1020087028557A patent/KR101419069B1/ko not_active Expired - Fee Related
- 2007-05-23 WO PCT/IB2007/002771 patent/WO2007144774A2/en not_active Ceased
- 2007-05-23 CN CN2007800184802A patent/CN101495828B/zh active Active
- 2007-05-23 JP JP2009511608A patent/JP5241707B2/ja not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP1860393A1 (en) | 2007-11-28 |
| WO2007144774A2 (en) | 2007-12-21 |
| EP1860393B1 (en) | 2009-02-18 |
| US20100000253A1 (en) | 2010-01-07 |
| WO2007144774A3 (en) | 2008-10-16 |
| CN101495828B (zh) | 2011-10-19 |
| ATE423298T1 (de) | 2009-03-15 |
| KR20090020574A (ko) | 2009-02-26 |
| CN101495828A (zh) | 2009-07-29 |
| KR101419069B1 (ko) | 2014-07-11 |
| EP2024698A2 (en) | 2009-02-18 |
| DE602006005229D1 (de) | 2009-04-02 |
| JP2009538405A (ja) | 2009-11-05 |
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