JP2008196686A - Lng運搬船の安全弁及びその開閉方法 - Google Patents
Lng運搬船の安全弁及びその開閉方法 Download PDFInfo
- Publication number
- JP2008196686A JP2008196686A JP2007290466A JP2007290466A JP2008196686A JP 2008196686 A JP2008196686 A JP 2008196686A JP 2007290466 A JP2007290466 A JP 2007290466A JP 2007290466 A JP2007290466 A JP 2007290466A JP 2008196686 A JP2008196686 A JP 2008196686A
- Authority
- JP
- Japan
- Prior art keywords
- lng
- storage tank
- safety valve
- carrier
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 238000003860 storage Methods 0.000 claims abstract description 247
- 238000012545 processing Methods 0.000 claims abstract description 38
- 238000011068 loading method Methods 0.000 claims abstract description 18
- 238000001704 evaporation Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 138
- 239000002737 fuel gas Substances 0.000 claims description 61
- 238000005259 measurement Methods 0.000 claims description 28
- 239000000446 fuel Substances 0.000 claims description 20
- 239000012528 membrane Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 239000003949 liquefied natural gas Substances 0.000 description 546
- 239000000969 carrier Substances 0.000 description 23
- 238000004519 manufacturing process Methods 0.000 description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 239000007788 liquid Substances 0.000 description 13
- 239000002699 waste material Substances 0.000 description 11
- 230000032258 transport Effects 0.000 description 9
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- 238000002485 combustion reaction Methods 0.000 description 7
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 239000003380 propellant Substances 0.000 description 4
- 239000006200 vaporizer Substances 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
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- 238000009530 blood pressure measurement Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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- 230000002787 reinforcement Effects 0.000 description 1
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Classifications
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- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/002—Storage in barges or on ships
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
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- F17C3/02—Vessels not under pressure with provision for thermal insulation
- F17C3/025—Bulk storage in barges or on ships
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- F17C2201/01—Shape
- F17C2201/0147—Shape complex
- F17C2201/0157—Polygonal
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- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/05—Size
- F17C2201/052—Size large (>1000 m3)
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- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/03—Thermal insulations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
- F17C2205/0332—Safety valves or pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0352—Pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
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- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
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- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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- F17C2223/033—Small pressure, e.g. for liquefied gas
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- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
- F17C2223/041—Stratification
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- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
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- F17C2227/0337—Heat exchange with the fluid by cooling
- F17C2227/0339—Heat exchange with the fluid by cooling using the same fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F17C2250/0408—Level of content in the vessel
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Abstract
【解決手段】LNGを運搬するLNG運搬船に設けられたLNG貯蔵タンクの上部に設置される安全弁の調節方法において、LNG貯蔵タンクにLNGを船積する際と、LNG運搬船が運航する際における安全弁の開閉圧力値を異にし、運航する際の圧力値をより高くする。
【選択図】図1
Description
LNG貯藏タンクで発生した蒸発ガスをボイラーで燃焼させ、発生したスチームによって駆動するスチームタービン推進方式は推進効率が低いという問題点がある。
LNG運搬船用LNG貯蔵タンク(1)に蓄積された蒸発ガスは大量であるので、殆どが荷役ターミナルで高圧圧縮機(3a)により普通70-80気圧に圧縮されてから消費者に供給される。一方、LNG運搬船用LNG貯蔵タンク(1)に蓄積された蒸発ガスの一部は低圧圧縮機(3b)により普通8気圧前後に圧縮されてから再凝縮器(4)を経て再凝縮され、気化器(5)で再度気化されて消費者に供給されることもある。
図6に例示された、LNG運搬船のLNG貯蔵タンクの圧力上昇低減装置は、LNG運搬船のLNG貯蔵タンク(1)の上部の蒸発ガスを圧縮後、LNG貯蔵タンク(1)の下部のLNG内に噴射させるよう構成されている。
2:荷役ターミナル用のLNG貯蔵タンク
3:圧縮機
4:再凝縮機
5:気化機
P:高圧ポンプ
11:LNG用ポンプ
13:LNG用スプレー
21:蒸発ガス用噴射ノズル
23:蒸発ガス用圧縮機
Claims (19)
- LNGを運搬するLNG運搬船に設けられたLNG貯蔵タンクの上部に設置される安全弁の調節方法において、上記LNG貯蔵タンクにLNGを船積する際と、上記LNG運搬船が運航する際における上記安全弁の開閉圧力値を異にし、上記の運航する際の圧力値がより高いということを特徴とする安全弁の開閉方法。
- 上記開閉圧力値は、上記のLNG貯蔵タンクで発生する蒸発ガスまたはLNGが外部に排出され、上記LNG貯蔵タンク内に積載されたLNGの量が減ってから上昇することを特徴とする、請求項1に記載の安全弁の開閉方法。
- 上記LNGを船積する際の開閉圧力値は0.25気圧以下で設定し、上記のLNG運搬船が運航する際の圧力値は0.25超過乃至2気圧設定することを特徴とする、請求項2に記載の安全弁の開閉方法。
- 上記LNG運搬船が運航する際の圧力値は0.25超過乃至0.7気圧で設定されることを特徴とする、請求項3に記載の安全弁の開閉方法。
- LNG運搬船のLNG貯蔵タンク内のLNGレベル、LNG貯蔵タンクの温度、LNG貯蔵タンクの圧力、LNG運搬船のトリム(trim)及びLNG運搬船のリスト(list)を測定し、これら測定されたデータの処理及び演算をし、LNG貯蔵タンク内のLNG体積を計算しLNG貯蔵タンク内に積載されたLNGの体積を把握することを特徴とする、請求項2乃至4のいずれかに記載の安全弁の開閉方法。
- 上記開閉方法は上記データを処理するデータ処理モジュールを含むことを特徴とする、請求項5に記載の安全弁の開閉方法。
- 上記データ処理モジュールでは最小自乗法、移動平均法または低帯域フィルターリング法を用いてデータを処理することを特徴とする、請求項6に記載の安全弁の開閉方法。
- 上記データ処理モジュールで処理されたデータを演算し、LNG貯蔵タンク内のLNG体積を計算するLNG体積モジュールを含むことを特徴とする、請求項7に記載の安全弁の開閉方法。
- 上記LNG貯蔵タンクから上記のLNG運搬船の燃料ガス推進手段に供給される燃料ガスの流量を測定し、初期LNG積載量と蒸発ガスの量を対比し、現在のLNG貯蔵タンク内のLNG体積を計算するとともに、上記の測定された燃料ガスの流量によって計算されたLNG体積を上記LNG体積計算モジュールのLNG体積に反映することを特徴とする、請求項8に記載の安全弁の開閉方法。
- LNG運搬船のLNG貯蔵タンクから燃料ガスを燃料ガス推進手段に供給する燃料供給ライン配管の途中に、計測範囲が異なる二つ以上のオリフィスを直列に配置し、流量に応じて適切な一つのオリフィスから出た測定値を選択し、LNG運搬船の燃料ガスの流量を計測し使われた流量を計算し、LNG貯蔵タンク内に積載されたLNGの体積を把握することを特徴とする、請求項2乃至4のいずれかに記載の安全弁の開閉方法。
- LNG運搬船の燃料ガスの流量を計測する装置で、LNG運搬船のLNG貯蔵タンクから燃料ガスを燃料ガス推進手段に供給する燃料供給ライン配管の途中に計測範囲の異なる二つ以上のオリフィスを直列に配置することを特徴とする、LNG運搬船の差圧式燃料ガス流量計測装置が装着されたことを特徴とする、請求項2乃至4のいずれかに記載の安全弁の開閉方法。
- LNGを運搬するLNG運搬船に設けられるLNG貯蔵タンクの上部に設置される安全弁において、上記LNG貯蔵タンクにLNGを船積する際、上記LNG運搬船が運航する際における上記の安全弁の開閉圧力値を異にし、上記開閉圧力値はLNGを船積する際によりLNG運搬船の運航の際がより高いことを特徴とする安全弁。
- 上記開閉圧力値は、上記のLNG貯蔵タンク内のLNG、またはそれから発生する蒸発ガスまたはLNGが外部へ排出され、上記LNG貯蔵タンク内に積載されたLNGの量が減ってから上昇することを特徴とする、請求項12に記載の安全弁。
- 上記LNGを船積する際の開閉圧力値は0.25気圧以下で設定し、上記LNG運搬船が運航する際の圧力値は0.25超過乃至2気圧で設定されることを特徴とする、請求項12に記載の安全弁。
- 請求項12乃至14のいずれかに記載の安全弁が備えられたLNG貯蔵タンク。
- 請求項15に記載のLNG貯蔵タンクが設けられたLNG運搬船。
- 上記LNG運搬船用LNG貯蔵タンクはメンブレイン型タンクであることを特徴とする、請求項1乃至4のいずれかに記載の安全弁の開閉方法。
- 上記LNG運搬船にはBOG処理手段が備えられていることを特徴とする、請求項1乃至4のいずれかに記載の安全弁の開閉方法。
- 上記LNG運搬船にはBOG処理手段が設けられておらず、上記LNG運搬船の途中にLNG貯蔵タンクからBOGの排出がないことを特徴とする、請求項1乃至4のいずれかに記載のLNG運搬船用安全弁の開閉方法。
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KR1020070014405A KR100805022B1 (ko) | 2007-02-12 | 2007-02-12 | Lng 운반선용 lng 저장탱크 및 이를 이용한 증발가스처리 방법 |
KR10-2007-0014405 | 2007-02-12 | ||
KR20070042103 | 2007-04-30 | ||
KR10-2007-0042103 | 2007-04-30 |
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JP2007290466A Active JP4750097B2 (ja) | 2007-02-12 | 2007-11-08 | Lng運搬船の安全弁及びその開閉方法 |
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CN106029490A (zh) * | 2014-02-24 | 2016-10-12 | 大宇造船海洋株式会社 | 用于处理蒸发气体的系统和方法 |
JP2017511767A (ja) * | 2014-02-24 | 2017-04-27 | デウ シップビルディング アンド マリン エンジニアリング カンパニー リミテッド | 蒸発ガスの処理システム及びその方法 |
JP2017106568A (ja) * | 2015-12-10 | 2017-06-15 | 三菱重工業株式会社 | 安全弁システム、タンク、船舶、船舶における安全弁システムの運用方法 |
JP2020507703A (ja) * | 2017-01-24 | 2020-03-12 | デウ シップビルディング アンド マリン エンジニアリング カンパニー リミテッド | 液化天然ガスを燃料として用いる船舶の燃料供給システム及び燃料供給方法 |
JP7100041B2 (ja) | 2017-01-24 | 2022-07-12 | デウ シップビルディング アンド マリン エンジニアリング カンパニー リミテッド | 液化天然ガスを燃料として用いる船舶の燃料供給システム及び燃料供給方法 |
JP2019043318A (ja) * | 2017-08-31 | 2019-03-22 | 川崎重工業株式会社 | 判定装置および判定方法 |
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JP2008196685A (ja) | 2008-08-28 |
US8028724B2 (en) | 2011-10-04 |
EP1956285B1 (en) | 2018-10-24 |
EP1956286A3 (en) | 2017-04-19 |
US11168837B2 (en) | 2021-11-09 |
US20080190352A1 (en) | 2008-08-14 |
US20080190118A1 (en) | 2008-08-14 |
US20190293236A1 (en) | 2019-09-26 |
US8943841B2 (en) | 2015-02-03 |
CN101706037B (zh) | 2013-10-23 |
EP1956286A2 (en) | 2008-08-13 |
EP1956285A3 (en) | 2017-01-04 |
US20130306643A1 (en) | 2013-11-21 |
US20120017608A1 (en) | 2012-01-26 |
US20090211262A1 (en) | 2009-08-27 |
US10352499B2 (en) | 2019-07-16 |
JP4750097B2 (ja) | 2011-08-17 |
US20080190117A1 (en) | 2008-08-14 |
US20200049311A1 (en) | 2020-02-13 |
CN101706037A (zh) | 2010-05-12 |
ES2715624T3 (es) | 2019-06-05 |
JP5227000B2 (ja) | 2013-07-03 |
US10508769B2 (en) | 2019-12-17 |
US8820096B2 (en) | 2014-09-02 |
EP1956285A2 (en) | 2008-08-13 |
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