JP6347003B1 - Lng船の蒸発ガス再液化方法及びシステム - Google Patents
Lng船の蒸発ガス再液化方法及びシステム Download PDFInfo
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- JP6347003B1 JP6347003B1 JP2018009153A JP2018009153A JP6347003B1 JP 6347003 B1 JP6347003 B1 JP 6347003B1 JP 2018009153 A JP2018009153 A JP 2018009153A JP 2018009153 A JP2018009153 A JP 2018009153A JP 6347003 B1 JP6347003 B1 JP 6347003B1
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- gas
- evaporative gas
- reliquefaction
- heat exchanger
- lng
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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
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/62—Details of storing a fluid in a tank
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0033—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cryogenic applications
Abstract
Description
再液化対象蒸発ガスの圧力による再液化性能評価実験の条件は、下記の通りである。
実際の運航条件では蒸発ガスの発生量は一定であるが、エンジンで使用する蒸発ガスの量が変化するため、エンジンで使用されず余った再液化対象蒸発ガスの流量が変化する。したがって、実験2では、再液化対象蒸発ガスの流量を変えながら、実際の再液化装置の再液化性能を評価した。実験の便宜上、爆発性を有するメタンに代えて一般的に多く使用される窒素を冷媒として利用し、使用される窒素の温度は貯蔵タンクから排出された蒸発ガスと同様に調整し、その他の条件も前記実験1の1〜9の条件と同様に調整した。
CR=(m1×c1)/(m2×c2) (1)
Claims (18)
- 1)LNG貯蔵タンクから排出される蒸発ガスを圧縮するステップ;
2)蒸発ガスを冷媒として、前記1)ステップで圧縮した蒸発ガスを熱交換器で熱交換して冷却するステップ;
3)前記2)ステップで冷却された流体を膨張させるステップ;及び
4)LNG船の運航条件が変わって、前記1)ステップで圧縮した後で前記熱交換器に供給される再液化対象蒸発ガスの流量が変動しても、再液化性能を安定的に維持するステップ;を含み、
前記熱交換器の比熱比(Heat Capacity Ratio)が0.7〜1.2の範囲である場合にも、再液化性能が安定的に維持されることを特徴とするLNG船の蒸発ガス再液化方法。 - 前記熱交換器は高温流体と低温流体との熱交換が行われるコアを備え、
前記コアは複数のブロックを備えることを特徴とする請求項1に記載のLNG船の蒸発ガス再液化方法。 - 5)前記3)ステップで膨張された流体を気液分離するステップをさらに含むことを特徴とする請求項1に記載のLNG船の蒸発ガス再液化方法。
- 前記5)ステップで気液分離された気体成分は蒸発ガスと合流して前記2)ステップで熱交換の冷媒として使用されることを特徴とする請求項3に記載のLNG船の蒸発ガス再液化方法。
- LNG船の運航速度は10〜17knotであることを特徴とする請求項1〜4のいずれか1項に記載のLNG船の蒸発ガス再液化方法。
- 前記1)ステップで圧縮した蒸発ガスの一部はエンジンの燃料として使用され、
前記エンジンの燃料として使用される蒸発ガスの流量が1,100〜2,660kg/hであることを特徴とする請求項1〜4のいずれか1項に記載のLNG船の蒸発ガス再液化方法。 - 前記エンジンは、推進用エンジン及び発電用のエンジンを備えることを特徴とする請求項6に記載のLNG船の蒸発ガス再液化方法。
- 前記再液化対象蒸発ガスの流量が1,900〜3,300kg/hであることを特徴とする請求項1〜4のいずれか1項に記載のLNG船の蒸発ガス再液化方法。
- 前記2)ステップで熱交換の冷媒として使用される蒸発ガスの流量を基準に、前記再液化対象蒸発ガスの流量の比が0.42〜0.72の範囲であることを特徴とする請求項1〜4のいずれか1項に記載のLNG船の蒸発ガス再液化方法。
- 前記1)ステップで圧縮した蒸発ガスのうち前記エンジンに送らない蒸発ガスを更に圧縮した後で前記熱交換器に送ることを特徴とする請求項6に記載のLNG船の蒸発ガス再液化方法。
- 1)LNG貯蔵タンクから排出される蒸発ガスを圧縮するステップ;
2)蒸発ガスを冷媒として、前記1)ステップで圧縮した蒸発ガスを熱交換して冷却するステップ;
3)前記2)ステップで冷却された流体を膨張させるステップ;及び
4)LNG船の運航条件が変わって、前記2)ステップで熱交換の冷媒として使用される蒸発ガスの流量が変動しても、再液化性能を安定的に維持するステップ;を含み、
前記熱交換器の比熱比(Heat Capacity Ratio)が0.7〜1.2の範囲である場合にも、再液化性能が安定的に維持されることを特徴とするLNG船の蒸発ガス再液化方法。 - 5)前記3)ステップで膨張された流体を気液分離するステップをさらに含み、
前記5)ステップで気液分離された気体成分は蒸発ガスと合流し、前記2)ステップで熱交換の冷媒として使用されることを特徴とする請求項11に記載のLNG船の蒸発ガス再液化方法。 - LNG貯蔵タンクから排出される蒸発ガスを高圧圧縮し、高圧圧縮蒸発ガスの全部または一部を前記LNG貯蔵タンクから排出される蒸発ガスと熱交換器で熱交換するステップ;及び熱交換した高圧圧縮蒸発ガスを減圧するステップ;を含む、高圧ガス噴射エンジンを備えるLNG船の蒸発ガス再液化方法において、
LNG船の運航条件の変更、または再液化対象蒸発ガスの流量が変動しても、再液化性能を安定的に維持するステップを含み、
前記熱交換器の比熱比(Heat Capacity Ratio)が0.7〜1.2の範囲である場合にも、再液化性能が安定的に維持されることを特徴とする高圧ガス噴射エンジンを備えるLNG船の蒸発ガス再液化方法。 - 前記コアの前記複数のブロック間に断熱層又は断熱部が存在することを特徴とする請求項2に記載のLNG船の蒸発ガス再液化方法。
- 前記高圧圧縮蒸発ガスは超臨界状態であることを特徴とする請求項13に記載の高圧ガス噴射エンジンを備えるLNG船の蒸発ガス再液化方法。
- 前記高圧圧縮蒸発ガスの圧力は100〜400baraであることを特徴とする請求項13に記載の高圧ガス噴射エンジンを備えるLNG船の蒸発ガス再液化方法。
- 前記高圧圧縮蒸発ガスの圧力は150〜400baraであることを特徴とする請求項16に記載の高圧ガス噴射エンジンを備えるLNG船の蒸発ガス再液化方法。
- 前記高圧圧縮蒸発ガスの圧力は150〜300baraであることを特徴とする請求項17に記載の高圧ガス噴射エンジンを備えるLNG船の蒸発ガス再液化方法。
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JP2016128737A (ja) * | 2015-01-09 | 2016-07-14 | 大阪瓦斯株式会社 | ボイルオフガスの再液化設備 |
JP2016176534A (ja) * | 2015-03-20 | 2016-10-06 | 千代田化工建設株式会社 | Bog処理装置 |
JP2016105022A (ja) * | 2016-03-01 | 2016-06-09 | 日揮株式会社 | 液化天然ガスの受入設備 |
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CN110461704A (zh) | 2019-11-15 |
WO2018139848A1 (ko) | 2018-08-02 |
CN108344248B (zh) | 2021-03-16 |
SG11201906861TA (en) | 2019-08-27 |
NO20190948A1 (en) | 2019-08-01 |
DK201970481A1 (da) | 2019-08-01 |
JP2020507504A (ja) | 2020-03-12 |
CN208012233U (zh) | 2018-10-26 |
CN108344247A (zh) | 2018-07-31 |
CN108344247B (zh) | 2020-12-01 |
JP2018119683A (ja) | 2018-08-02 |
CN110461704B (zh) | 2022-12-20 |
US11724789B2 (en) | 2023-08-15 |
RU2736758C1 (ru) | 2020-11-19 |
JP7048621B2 (ja) | 2022-04-05 |
CN108344248A (zh) | 2018-07-31 |
WO2018139856A1 (ko) | 2018-08-02 |
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DK180825B1 (en) | 2022-05-03 |
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