JPS6132556B2 - - Google Patents

Info

Publication number
JPS6132556B2
JPS6132556B2 JP16970981A JP16970981A JPS6132556B2 JP S6132556 B2 JPS6132556 B2 JP S6132556B2 JP 16970981 A JP16970981 A JP 16970981A JP 16970981 A JP16970981 A JP 16970981A JP S6132556 B2 JPS6132556 B2 JP S6132556B2
Authority
JP
Japan
Prior art keywords
liquefied gas
bog
storage tank
pressure
control valve
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.)
Expired
Application number
JP16970981A
Other languages
Japanese (ja)
Other versions
JPS5872799A (en
Inventor
Juzo Sugawara
Atsushi Kubota
Yasuhiro Takagishi
Makoto Tashimo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokyo Gas Co Ltd
Original Assignee
Tokyo Gas Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokyo Gas Co Ltd filed Critical Tokyo Gas Co Ltd
Priority to JP16970981A priority Critical patent/JPS5872799A/en
Publication of JPS5872799A publication Critical patent/JPS5872799A/en
Publication of JPS6132556B2 publication Critical patent/JPS6132556B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • F17C13/126—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures for large storage containers for liquefied gas
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/052—Size large (>1000 m3)
    • 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
    • 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
    • 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
    • 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
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • 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
    • 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
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off

Description

【発明の詳細な説明】 （以下利用分野、従来技術等発明の目的） 本発明は、低温液体、例えば液化天然ガス（以
下LNGという）を貯蔵する貯槽内に於いて、自
然蒸発により発生するガス（以下BOGという）
を一時的に抑制する方法に係るものである。従
来、例えば需要の減少等により、貯槽内BOGの
発生量を一時的に制限する必要が生じた場合、コ
ンプレツサ等で吸入昇圧したBOGを、別個に設
置した冷却液化装置により液化していた。このた
め、コンプレツサ及び冷却液化装置が必要となり
設備費が高くなる上に、液化装置の運転維持にも
費用がかかり、コストアツプにもつながつてい
た。本発明は、貯槽内の液化ガスを利用すること
によつて、貯槽内のBOGの発生を抑制するもの
であつて、本発明によれば、前記した従来の諸欠
点を一掃できるものである。以下図について詳述
すると次の通りである。Detailed Description of the Invention (Hereinafter, Field of Application, Prior Art, etc. Object of the Invention) The present invention is directed to the use of gas generated by natural evaporation in a storage tank for storing low-temperature liquids, such as liquefied natural gas (hereinafter referred to as LNG). (hereinafter referred to as BOG)
This relates to a method for temporarily suppressing Conventionally, when it became necessary to temporarily limit the amount of BOG generated in a storage tank due to a decrease in demand, for example, the BOG was sucked in and pressurized by a compressor, etc., and then liquefied using a separately installed cooling liquefaction device. For this reason, a compressor and a cooling liquefaction device are required, which increases equipment costs, and it also costs money to operate and maintain the liquefaction device, leading to an increase in costs. The present invention suppresses the generation of BOG in the storage tank by utilizing the liquefied gas in the storage tank, and according to the present invention, the various drawbacks of the prior art described above can be wiped out. The details of the figure are as follows.

（以下発明の構成作用） 符号１は、例えばLNGを貯蔵する貯槽であつ
て、この貯槽１にBOG排出管２を設けて、該排
出管２には圧力制御弁３を装置する。４は液化ガ
ス５の取出管であつて、この取出管４に、先端に
ジエツトミキシングノズル６を設けた液化ガス噴
出管７を接続する。８は先端にスプレ９を設けた
スプレ管であつて、このスプレ管８も、前記取出
管４と接続する。１０は液化ガス送出ポンプであ
る。(Hereinafter, the structure and operation of the invention) Reference numeral 1 denotes a storage tank for storing, for example, LNG, and this storage tank 1 is provided with a BOG discharge pipe 2, and the discharge pipe 2 is equipped with a pressure control valve 3. Reference numeral 4 denotes a take-out pipe for the liquefied gas 5, and a liquefied gas jet pipe 7 having a jet mixing nozzle 6 at its tip is connected to the take-out pipe 4. Reference numeral 8 denotes a spray tube having a spray 9 at its tip, and this spray tube 8 is also connected to the extraction tube 4. 10 is a liquefied gas delivery pump.

通常時の液化ガス５の液表面は、BOG層の圧
力とBOG発生量に対応する過熱温度で平衡状態
になつている。この時、一時的にBOG発生量を
抑制する必要が生じた場合、圧力制御弁３を閉じ
るとBOG層の圧力が急上昇し、圧力が高くなつ
た分に応じて液化ガス５の飽和温度が急上昇す
る。しかし、液化ガス５の熱容量が大きいため、
液化ガスは徐々に温度が上昇する。従つて圧力急
上昇前のBOGが発生する過熱状態の平衡がくず
れ、過熱度が小さくなるので、BOGの発生は抑
制される。かかる際、液表面の液化ガスは、局部
的に過熱されやすいが、同時にジエツトミキシン
グノズル６から液化ガスを貯槽１内の液化ガス中
に噴出すると、液表面の局部的過熱状態の液化ガ
スと、液内部の過熱されていない液化ガスが混合
し、液化ガス５の表面は過冷された状態となり、
一時的に平衡がくずれ、BOGが液化される。前
記した通り、液化ガス５の熱容量は大きいので、
液化ガス５は徐々に加熱され、BOG層圧力の飽
和温度以上に加熱されるまで、BOGの発生を一
時的に抑制することができる。実操業としては、
95000Klの貯槽で、液量が半分以上の場合に於い
て、圧力上昇が400mmAq、ノズル６からの噴出量
35Nm3／ｈの場合には、本発明を適用しない場合
に発生する30000Nm3（3000Nm3／ｈ×10hrs）の
BOGを10時間抑制することができた。 Under normal conditions, the liquid surface of the liquefied gas 5 is in an equilibrium state at a superheat temperature corresponding to the pressure of the BOG layer and the amount of BOG generated. At this time, if it is necessary to temporarily suppress the amount of BOG generated, when the pressure control valve 3 is closed, the pressure in the BOG layer will rise rapidly, and the saturation temperature of the liquefied gas 5 will rise sharply as the pressure increases. do. However, since the heat capacity of the liquefied gas 5 is large,
The temperature of the liquefied gas gradually increases. Therefore, the equilibrium of the superheated state in which BOG occurs before the pressure suddenly rises is disrupted, and the degree of superheating decreases, so that the generation of BOG is suppressed. In such a case, the liquefied gas on the liquid surface tends to be locally overheated, but if the liquefied gas is simultaneously jetted from the jet mixing nozzle 6 into the liquefied gas in the storage tank 1, the liquefied gas on the liquid surface is heated locally. , the unsuperheated liquefied gas inside the liquid mixes, and the surface of the liquefied gas 5 becomes supercooled,
The equilibrium is temporarily disrupted and the BOG is liquefied. As mentioned above, the heat capacity of the liquefied gas 5 is large, so
The liquefied gas 5 is gradually heated, and the generation of BOG can be temporarily suppressed until the liquefied gas 5 is heated to a temperature equal to or higher than the saturation temperature of the BOG layer pressure. In actual operation,
In a 95000Kl storage tank, when the liquid volume is more than half, the pressure rise is 400mmAq, and the amount of spray from nozzle 6 is
In the case of 35Nm 3 /h, the amount of 30000Nm 3 (3000Nm 3 /h x 10hrs) generated when the present invention is not applied is
BOG could be suppressed for 10 hours.

なお、液化ガス５の表面温度を下げるために温
度コントロール弁１１を介してスプレ９から液化
ガスをスプレしてもよい。 In addition, in order to lower the surface temperature of the liquefied gas 5, the liquefied gas may be sprayed from the sprayer 9 via the temperature control valve 11.

（以下発明の効果） 本発明は以上の通り、BOGの発生を一時的に
抑制しなければならない事態が生じた場合、従来
のように、コンプレツサ、冷却液化装置等が不要
となるので、装置的に簡易化されると同時に、そ
の制御が弁の開閉のみで行うことができるので、
簡単且つ短時間で行うことができる大きなメリツ
トがある。(Hereinafter, the effects of the invention) As described above, the present invention eliminates the need for compressors, cooling liquefaction equipment, etc. as in the past when a situation arises in which the generation of BOG needs to be temporarily suppressed. At the same time, the control can be performed only by opening and closing the valve.
It has the great advantage of being simple and quick.

【図面の簡単な説明】[Brief explanation of the drawing]

図は全体の系統説明図である。符号１……貯
槽、２……BOG排出管、３……圧力制御弁、４
……液化ガス取出管、５……液化ガス、６……ジ
エツトミキシングノズル、７……液化ガス噴出
管、８……スプレ管、９……スプレ、１０……液
化ガス送出ポンプ、１１……温度コントロール
弁。 The figure is an explanatory diagram of the entire system. Code 1...Storage tank, 2...BOG discharge pipe, 3...Pressure control valve, 4
...Liquefied gas take-off pipe, 5...Liquefied gas, 6...Jet mixing nozzle, 7...Liquefied gas ejection pipe, 8...Spray pipe, 9...Spray, 10...Liquefied gas delivery pump, 11... ...Temperature control valve.

Claims (1)

【特許請求の範囲】[Claims] １ BOG排出管に圧力制御弁を設け、該圧力制
御弁を閉とすることによつて貯槽内BOGの圧力
を急上昇させると共に貯槽内液化ガス取出管から
液化ガスの一部を取り出し、それを貯槽内液化ガ
ス中に噴出させて貯槽内液化ガスの撹拌混合を行
ない貯槽内のBOGの発生を一時的に抑制するこ
とを特徴とする貯槽内BOG発生抑制方法。1. A pressure control valve is installed in the BOG discharge pipe, and by closing the pressure control valve, the pressure of the BOG in the storage tank is suddenly increased, and a part of the liquefied gas is taken out from the liquefied gas extraction pipe in the storage tank, and then it is transferred to the storage tank. A method for suppressing the generation of BOG in a storage tank, characterized by temporarily suppressing the generation of BOG in the storage tank by jetting it into the liquefied gas in the storage tank to stir and mix the liquefied gas in the storage tank.
JP16970981A 1981-10-23 1981-10-23 Bog generation suppression method in storage tank Granted JPS5872799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16970981A JPS5872799A (en) 1981-10-23 1981-10-23 Bog generation suppression method in storage tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16970981A JPS5872799A (en) 1981-10-23 1981-10-23 Bog generation suppression method in storage tank

Publications (2)

Publication Number Publication Date
JPS5872799A JPS5872799A (en) 1983-04-30
JPS6132556B2 true JPS6132556B2 (en) 1986-07-28

Family

ID=15891408

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16970981A Granted JPS5872799A (en) 1981-10-23 1981-10-23 Bog generation suppression method in storage tank

Country Status (1)

Country Link
JP (1) JPS5872799A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2247942B (en) * 1990-09-05 1994-08-03 Mitsubishi Electric Corp Cryostat
DE4342210C2 (en) * 1993-12-10 1996-08-14 Daimler Benz Aerospace Ag Storage of cryogenic liquids without stratification
JP2007292178A (en) * 2006-04-25 2007-11-08 Chiyoda Corp Cold insulation circulation system of liquefied gas facility

Also Published As

Publication number Publication date
JPS5872799A (en) 1983-04-30

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