JP2899173B2 - BOG treatment method and device in liquid / liquid thermal regulator in LNG tank - Google Patents

BOG treatment method and device in liquid / liquid thermal regulator in LNG tank

Info

Publication number
JP2899173B2
JP2899173B2 JP17211692A JP17211692A JP2899173B2 JP 2899173 B2 JP2899173 B2 JP 2899173B2 JP 17211692 A JP17211692 A JP 17211692A JP 17211692 A JP17211692 A JP 17211692A JP 2899173 B2 JP2899173 B2 JP 2899173B2
Authority
JP
Japan
Prior art keywords
lpg
tank
lng
bog
liquid
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 - Lifetime
Application number
JP17211692A
Other languages
Japanese (ja)
Other versions
JPH0617999A (en
Inventor
嘉明 宮田
雅一 花牟礼
収 中山
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 JP17211692A priority Critical patent/JP2899173B2/en
Publication of JPH0617999A publication Critical patent/JPH0617999A/en
Application granted granted Critical
Publication of JP2899173B2 publication Critical patent/JP2899173B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • 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
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0631—Temperature
    • 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
    • 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
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、ＬＮＧタンク内にＬＰ
Ｇを直接混合してこの混合割り合いによりＬＮＧの熱量
調整を行う所謂ＬＮＧタンク内液液熱調装置におけるＢ
ＯＧの処理方法及びその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention
G in a so-called LNG tank liquid-liquid heat regulator that directly mixes G and adjusts the calorific value of LNG by this mixing ratio.
The present invention relates to an OG processing method and apparatus.

【０００２】[0002]

【従来の技術】従来のＬＮＧタンク内液液熱調方法及び
その装置を図２に示す。１はＬＮＧタンク、２はＬＮＧ
払い出しライン、３はＢＯＧ処理ラインにして、このラ
イン３はＬＮＧタンク１内に発生したＢＯＧを回収し、
コンプレーサー４にて昇圧後ＢＯＧ処理熱交換器５に導
き、ここで払い出しＬＮＧの一部と熱交換し、煮詰まり
防止及びＢＯＧをそのまま逆出したときの熱調装置の省
略の目的から、再度ＬＮＧタンク１内に返送するもので
ある。６はＢＯＧ処理熱交換器５を経由するＬＮＧ分岐
ラインである。2. Description of the Related Art FIG. 2 shows a conventional method and apparatus for controlling the temperature of liquid and liquid in an LNG tank. 1 is LNG tank, 2 is LNG
The payout line 3 is a BOG processing line, and this line 3 collects BOG generated in the LNG tank 1,
After being pressurized by the compensator 4, the pressure is led to the BOG treatment heat exchanger 5, where it is heat-exchanged with a part of the discharged LNG. It is to be returned to the tank 1. Reference numeral 6 denotes an LNG branch line passing through the BOG processing heat exchanger 5.

【０００３】７はＬＰＧタンク、８はＬＰＧラインにし
て、このＬＰＧライン８から払い出されたＬＰＧは、Ｌ
ＰＧ精製装置９を経由して水、メタノール等の不純物が
除去されてからＬＰＧ予冷熱交換器１０において、払い
出しＬＮＧの一部を予冷ライン１１を経由して分岐した
ＬＮＧと熱交換して−１５０℃〜−１４０℃まで予冷さ
れたのち、ＬＮＧタンク１内に直接混合される。[0003] 7 is an LPG tank, 8 is an LPG line, and the LPG paid out from this LPG line 8 is L
After removal of impurities such as water and methanol through the PG purification device 9, the LPG pre-cooling heat exchanger 10 heat-exchanges part of the discharged LNG with LNG branched off via the pre-cooling line 11 to -150. After being pre-cooled to a temperature of from −140 ° C. to −140 ° C., it is directly mixed into the LNG tank 1.

【０００４】[0004]

【発明が解決しようとする課題】しかし、上記ＬＮＧタ
ンク内液液熱調装置におけるＢＯＧ処理方法及び装置に
おいては次のような問題がある。However, there are the following problems in the BOG processing method and apparatus in the above-mentioned liquid / liquid heat regulator in the LNG tank.

【０００５】ａ．ＬＰＧタンク７内に発生するＢＯＧの
処理設備が別に必要である。A. A separate facility for treating BOG generated in the LPG tank 7 is required.

【０００６】ｂ．ＬＰＧタンク７内に発生するＢＯＧ
は、その組成からＢＯＧ処理熱交換器５での熱交換効率
が悪く、この分動力費が多くかかる。B. BOG generated in LPG tank 7
Is inferior in heat exchange efficiency in the BOG treatment heat exchanger 5 due to its composition, and the power cost is increased accordingly.

【０００７】本発明の目的は上記ａ〜ｂに記した欠点を
解消することである。An object of the present invention is to eliminate the above-mentioned disadvantages a and b.

【０００８】[0008]

【課題を解決するための手段】本発明に係るＬＮＧタン
ク内液液熱調装置におけるＢＯＧの処理方法及びその装
置の構成は次のとおりである。Means for Solving the Problems The method for treating BOG in the liquid / liquid thermal regulator in the LNG tank according to the present invention and the configuration of the apparatus are as follows.

【０００９】１．熱調用のＬＰＧを払い出しＬＮＧによ
り予冷したのちＬＮＧタンク内のＬＮＧに直接混合して
行うＬＮＧタンク内液液熱調装置において、予冷後のＬ
ＰＧの一部をＬＰＧタンク内に戻すことにより、貯蔵さ
れているＬＰＧを冷却してＬＰＧタンク内に発生するＢ
ＯＧの量を抑制するＬＮＧタンク内液液熱調装置におけ
るＬＰＧタンク内に発生するＢＯＧの処理方法。1. LPG for heat control is dispensed, pre-cooled by LNG, and then directly mixed with LNG in the LNG tank.
By returning a part of the PG into the LPG tank, the stored LPG is cooled to generate B generated in the LPG tank.
A method for treating BOG generated in an LPG tank in an LNG tank liquid-liquid thermal regulator that suppresses the amount of OG.

【００１０】２．ＬＮＧタンク内に発生したＢＯＧを昇
圧後予冷したＬＰＧに混合し、更に払い出しＬＮＧによ
り冷却したのちＬＮＧタンク内に戻すＬＮＧタンク内液
液熱調装置におけるＬＮＧタンク内に発生するＢＯＧの
処理方法。[0010] 2. A method for treating BOG generated in the LNG tank in the liquid-liquid heat regulator in the LNG tank, in which the BOG generated in the LNG tank is mixed with the pre-cooled LPG after being pressurized, and further discharged, cooled by the LNG and returned to the LNG tank.

【００１１】３．ＬＰＧタンク内から払い出したＬＰＧ
をＬＮＧタンク内に混合するためのＬＰＧラインにＬＰ
Ｇ予冷熱交換器とＢＯＧ液化装置を取り付けたこと、Ｌ
ＮＧ払い出しラインを分岐してこのＬＮＧ分岐ラインを
前記ＢＯＧ液化装置及びＬＰＧ予冷熱交換器を経由させ
るように構成したこと、予冷熱交換器から出たＬＰＧの
一部をＬＰＧ分岐ラインを経由してＬＰＧタンク内に戻
すように構成したこと、ＬＮＧタンク内に発生したＢＯ
Ｇを処理するためのＢＯＧラインをＬＰＧ予冷熱交換器
の後流側ＬＰＧラインに連結し、ＢＯＧ処理熱交換器を
経由してＬＮＧタンク内に戻すように構成したこと、を
特徴とするＬＮＧタンク内液液熱調装置におけるＢＯＧ
の処理装置。3. LPG paid out from the LPG tank
To the LPG line for mixing the LNG into the LNG tank
G Pre-cooling heat exchanger and BOG liquefaction unit installed, L
The LNG branch line is branched through the BOG liquefier and the LPG pre-cooling heat exchanger, and a part of the LPG discharged from the pre-cooling heat exchanger is routed through the LPG branch line. The LNG tank is configured to return to the LPG tank, and the BO generated in the LNG tank is
An LNG tank, wherein a BOG line for processing G is connected to an LPG line downstream of the LPG pre-cooling heat exchanger and returned to the LNG tank via the BOG processing heat exchanger. BOG in internal liquid / liquid heat regulator
Processing equipment.

【００１２】[0012]

【作用】ＬＰＧタンク内から払い出されたＬＰＧはＬＰ
Ｇ精製装置により水、メタノール等の不純物が除去され
たのち、ＬＰＧ予冷熱交換器においてＬＮＧ分岐ライン
及び予冷ライン経由で分岐された払い出しＬＮＧの一部
により予冷され、予冷された一部はＬＰＧタンク内に返
送され、他の一部はＢＯＧ処理熱交換器により再び払い
出しＬＮＧによって冷却されたのち、ＬＮＧタンク内に
熱調用として直接混合される。[Function] LPG paid out from the LPG tank is LP
After the impurities such as water and methanol are removed by the G refining device, the LPG precooling heat exchanger is precooled by a part of the dispensed LNG branched via the LNG branch line and the precooling line, and the precooled part is an LPG tank. The other part is discharged again by the BOG processing heat exchanger, cooled again by LNG, and then mixed directly into the LNG tank for heat regulation.

【００１３】ＬＮＧタンク内に発生したＢＯＧはＢＯＧ
ラインを介してコンプレーサーで昇圧されたのち、予冷
熱交換器からＬＮＧタンク（ＢＯＧ処理熱交換器）に至
る予冷されたＬＰＧに混合され、再液化後ＬＮＧタンク
内に返送される。The BOG generated in the LNG tank is BOG
After being boosted in pressure by the compensator via the line, it is mixed with precooled LPG from the precooling heat exchanger to the LNG tank (BOG processing heat exchanger), re-liquefied and returned to the LNG tank.

【００１４】[0014]

【実施例】図１において、１はＬＮＧタンク、２はＬＮ
Ｇ払い出しライン、３はＬＮＧタンク１内に発生したＢ
ＯＧを回収し、コンプレーサー４にて昇圧後ＢＯＧ処理
熱交換器５に導き、ここで払い出しＬＮＧの一部と熱交
換し、煮詰まり防止及びＢＯＧをそのまま逆出したとき
の熱調装置の省略の目的から再度ＬＮＧタンク１内に返
送するためのＢＯＧ処理ライン、６はＬＮＧ分岐ライン
である。FIG. 1 shows an LNG tank 1 and an LN tank 2.
G payout line, 3 is B generated in LNG tank 1
The OG is collected, and after the pressure is increased by the compensator 4, the OG is guided to the BOG treatment heat exchanger 5, where the OG is exchanged with a part of the LNG to prevent boiling and to omit the heat control device when the BOG is returned as it is. A BOG processing line for returning to the LNG tank 1 again from the purpose, and 6 is an LNG branch line.

【００１５】７はＬＰＧタンク、８はＬＰＧ払い出し用
のＬＰＧラインにして、このＬＰＧライン８から払い出
されたＬＰＧはＬＰＧ精製装置９を経由して水、メタノ
ール等の不純物が除去されてからＬＰＧ予冷熱交換器１
０及びＢＯＧ処理熱交換器１６において、ＬＮＧ分岐ラ
イン６及び予冷ライン１１を経由して分岐したＬＮＧと
熱交換して−１５０℃〜−１４０℃まで予冷されたの
ち、ＬＮＧタンク１内に液状で混合される。なお、前記
ＢＯＧ処理ライン３とＬＰＧライン８はＢＯＧ処理熱交
換器５とＬＰＧ予冷熱交換器１０間において連結されて
いる。Reference numeral 7 denotes an LPG tank, 8 denotes an LPG line for dispensing LPG, and LPG discharged from the LPG line 8 passes through an LPG refining device 9 to remove impurities such as water and methanol before the LPG is removed. Pre-cooling heat exchanger 1
In the heat exchanger 16 and the BOG processing heat exchanger 16, heat exchange is performed with LNG branched via the LNG branch line 6 and the precooling line 11, and the LNG is precooled to −150 ° C. to −140 ° C. Mixed. The BOG processing line 3 and the LPG line 8 are connected between the BOG processing heat exchanger 5 and the LPG pre-cooling heat exchanger 10.

【００１６】１２は予冷熱交換器１０を出た予冷ＬＰＧ
の一部を分岐してＬＰＧタンク７内に返送する予冷ＬＰ
Ｇ分岐ライン、１３は調節弁、１４はＢＯＧ処理ライン
３を分岐し、圧力調節弁１５を経由してＬＰＧタンク７
の気層に連結されたＬＰＧタンク７の圧力調整ラインで
ある。Reference numeral 12 denotes a pre-cooled LPG that has exited the pre-cooled heat exchanger 10.
Pre-cooling LP that branches off part of it and returns it to the LPG tank 7
G branch line, 13 is a control valve, 14 is a branch of the BOG processing line 3, and is passed through a pressure control valve 15 to the LPG tank 7.
Is a pressure adjustment line of the LPG tank 7 connected to the gas layer of FIG.

【００１７】上記実施例の場合、ＬＰＧタンク７内から
ＬＰＧライン８を経由して払い出されたＬＰＧはＬＰＧ
精製装置９により水、メタノール等の不純物が除去され
たのち、ＬＰＧ予冷熱交換器１０においてＬＮＧ分岐ラ
イン６及び予冷ライン１１経由で分岐された払い出しＬ
ＮＧの一部により予冷され、この予冷された一部は予冷
ＬＰＧ分岐ライン１２からＬＰＧタンク７内に返送され
る。他の一部はＢＯＧ処理熱交換器５により再び払い出
しＬＮＧによって冷却されたのち、ＬＮＧタンク１内に
直接混合される。In the case of the above embodiment, the LPG paid out from the LPG tank 7 via the LPG line 8 is LPG.
After the impurities such as water and methanol are removed by the purification device 9, the discharge L branched off via the LNG branch line 6 and the precooling line 11 in the LPG precooling heat exchanger 10.
Precooled by a part of the NG, and the precooled part is returned from the precooled LPG branch line 12 into the LPG tank 7. The other part is discharged again by the BOG processing heat exchanger 5, cooled again by LNG, and then directly mixed into the LNG tank 1.

【００１８】ＬＮＧタンク１内で発生したＢＯＧはＢＯ
Ｇ処理ライン３のコンプレーサー４で昇圧されたのち、
予冷熱交換器１０からＬＮＧタンク１（ＢＯＧ処理熱交
換器５）に至る予冷ＬＰＧに混合され、再液化後ＬＮＧ
タンク１内に返送される。なお、ＬＰＧタンク７内の整
圧のため、ＬＮＧタンク１内に発生したＢＯＧの一部を
整圧ライン１４を介してＬＰＧタンク７内に導入し、こ
のＬＰＧタンク７内の負圧化を防止する。この調整手段
は、整圧ライン１４の圧力調整弁１５をＬＰＧタンク７
内の圧力に基づいて行うフィードバック制御である。BOG generated in the LNG tank 1 is BO
After being boosted by the compressor 4 of the G processing line 3,
It is mixed with the pre-cooled LPG from the pre-cooled heat exchanger 10 to the LNG tank 1 (BOG processing heat exchanger 5), and after reliquefaction, LNG
Returned to tank 1. In order to regulate the pressure in the LPG tank 7, a part of the BOG generated in the LNG tank 1 is introduced into the LPG tank 7 through the pressure regulating line 14, thereby preventing the LPG tank 7 from being negatively pressurized. I do. This adjusting means connects the pressure adjusting valve 15 of the pressure adjusting line 14 to the LPG tank 7.
This is feedback control performed based on the internal pressure.

【００１９】[0019]

【本発明の効果】本発明は以上の如き構成から成り、次
の如き効果を奏する。The present invention has the above-mentioned structure and has the following effects.

【００２０】ａ．予冷後のＬＰＧの一部をＬＰＧタンク
内に返送するため、この予冷されたＬＰＧにより、ＬＰ
Ｇタンク内が冷却される。この結果ＬＰＧタンク内に発
生するＢＯＧ量が抑制されるので、ＬＰＧタンク内に発
生したＢＯＧの処理設備を従来例に比較して大幅に削減
できる。A. To return a part of the pre-cooled LPG to the LPG tank, the pre-cooled LPG uses
The inside of the G tank is cooled. As a result, the amount of BOG generated in the LPG tank is suppressed, so that the processing equipment for BOG generated in the LPG tank can be significantly reduced as compared with the conventional example.

【００２１】ｂ．ＬＮＧタンク内に発生したＢＯＧを予
冷後のＬＰＧに混合して再液化を行い、これを更にＢＯ
Ｇ処理熱交換器で冷却してからＬＮＧタンク内に返送す
るため、ＢＯＧ処理熱交換器における熱交換効率が向上
し、この向上した分ＢＯＧ処理用の動力費を低減でき
る。B. The BOG generated in the LNG tank is mixed with the pre-cooled LPG and re-liquefied.
Since it is cooled in the G processing heat exchanger and returned to the LNG tank, the heat exchange efficiency in the BOG processing heat exchanger is improved, and the power cost for BOG processing can be reduced by the improved amount.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明に係るＬＮＧタンク内熱調装置における
ＢＯＧ処理方法及びその装置の説明図。FIG. 1 is an explanatory view of a BOG processing method and an apparatus therefor in an LNG tank heat regulation apparatus according to the present invention.

【図２】従来のＬＮＧタンク内液液熱調装置におけるＢ
ＯＧ処理方法及びその装置の説明図。FIG. 2 shows B in a conventional liquid / liquid heat regulator in an LNG tank.
Explanatory drawing of the OG processing method and its apparatus.

【符号の説明】[Explanation of symbols]

１ ＬＮＧタンク ２ ＬＮＧ払い出しライン ３ ＢＯＧ処理ライン ４ コンプレーサー ５ ＢＯＧ処理熱交換器 ６ ＬＮＧ分岐ライン ７ ＬＰＧタンク ８ ＬＰＧライン ９ ＬＰＧ精製装置 １０ ＬＰＧ予冷熱交換器 １１ 予冷ライン １２ 予冷ＬＰＧ分岐ライン １３ 調節弁 １４ 整圧ライン １５ 圧力調節弁 DESCRIPTION OF SYMBOLS 1 LNG tank 2 LNG payout line 3 BOG processing line 4 Composer 5 BOG processing heat exchanger 6 LNG branch line 7 LPG tank 8 LPG line 9 LPG refiner 10 LPG pre-cooling heat exchanger 11 Pre-cooling line 12 Pre-cooling LPG branch line 13 Adjustment Valve 14 Pressure regulating line 15 Pressure control valve

フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F17C 13/00 302 C10L 3/06 C10L 3/12 Continuation of front page (58) Field surveyed (Int. Cl. 6 , DB name) F17C 13/00 302 C10L 3/06 C10L 3/12

Claims (5)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 熱調用のＬＰＧを払い出しＬＮＧにより
予冷したのちＬＮＧタンク内のＬＮＧに直接混合して行
うＬＮＧタンク内液液熱調装置において、予冷後のＬＰ
Ｇの一部をＬＰＧタンク内に戻すことにより、貯蔵され
ているＬＰＧを冷却してＬＰＧタンク内に発生するＢＯ
Ｇの量を抑制するＬＮＧタンク内液液熱調装置における
ＬＰＧタンク内に発生するＢＯＧの処理方法。1. An LNG tank liquid-liquid thermoregulator for dispensing LPG for heat regulation, pre-cooling by LNG, and directly mixing the LNG in the LNG tank.
By returning a part of G into the LPG tank, the stored LPG is cooled and BO generated in the LPG tank is cooled.
A method for treating BOG generated in an LPG tank in an LNG tank liquid / liquid thermal regulator that suppresses the amount of G. 【請求項２】 ＬＮＧタンク内に発生したＢＯＧを昇圧
後予冷したＬＰＧに混合し、更に払い出しＬＮＧにより
冷却したのちＬＮＧタンク内に戻すＬＮＧタンク内液液
熱調装置におけるＬＮＧタンク内に発生するＢＯＧの処
理方法。2. BOG generated in the LNG tank in the liquid-liquid heat regulator in the LNG tank, wherein the BOG generated in the LNG tank is mixed with the pre-cooled LPG after pressurization, cooled by the discharged LNG and returned to the LNG tank. Processing method. 【請求項３】 ＬＮＧタンク内に発生したＢＯＧをＬＰ
Ｇタンク内に導くことにより、ＬＰＧタンク内の圧力の
制御を行う請求項１、２記載のＢＯＧの処理方法。3. BOG generated in the LNG tank is converted to LP
3. The BOG processing method according to claim 1, wherein the pressure in the LPG tank is controlled by guiding the pressure into the G tank. 【請求項４】 ＬＰＧタンク内から払い出したＬＰＧを
ＬＮＧタンク内に混合するためのＬＰＧラインにＬＰＧ
予冷熱交換器とＢＯＧ液化装置を取り付けたこと、 ＬＮＧ払い出しラインを分岐してこのＬＮＧ分岐ライン
を前記ＢＯＧ液化装置及びＬＰＧ予冷熱交換器を経由さ
せるように構成したこと、 予冷熱交換器から出たＬＰＧの一部をＬＰＧ分岐ライン
を経由してＬＰＧタンク内に戻すように構成したこと、 ＬＮＧタンク内に発生したＢＯＧを処理するためのＢＯ
ＧラインをＬＰＧ予冷熱交換器の後流側ＬＰＧラインに
連結し、ＢＯＧ処理熱交換器を経由してＬＮＧタンク内
に戻すように構成したこと、 を特徴とするＬＮＧタンク内液液熱調装置におけるＢＯ
Ｇの処理装置。4. An LPG line for mixing LPG discharged from the LPG tank into the LNG tank.
The pre-cooling heat exchanger and the BOG liquefaction device were installed, the LNG payout line was branched, and the LNG branch line was configured to pass through the BOG liquefier and the LPG pre-cooling heat exchanger. A part of the LPG that has been returned to the LPG tank via the LPG branch line, and a BO for processing the BOG generated in the LNG tank.
A liquid-liquid thermoregulator in the LNG tank, wherein the G line is connected to the LPG line on the downstream side of the LPG pre-cooling heat exchanger and returned to the LNG tank via the BOG processing heat exchanger. BO in
G processing unit. 【請求項５】 ＬＮＧタンクとＬＰＧタンクの気層を整
圧ラインにて連結し、この整圧ラインに圧力調節弁を取
り付け、ＬＰＧタンク内の圧力により圧力調節弁をフィ
ードバック制御してＬＰＧタンク内を一定の圧力になる
ように制御する請求項４記載のＢＯＧ処理装置。5. The gas layer of the LNG tank and the LPG tank is connected by a pressure regulating line, and a pressure regulating valve is attached to the pressure regulating line. 5. The BOG processing apparatus according to claim 4, wherein the BOG processing device controls the pressure to a constant value.
JP17211692A 1992-06-30 1992-06-30 BOG treatment method and device in liquid / liquid thermal regulator in LNG tank Expired - Lifetime JP2899173B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17211692A JP2899173B2 (en) 1992-06-30 1992-06-30 BOG treatment method and device in liquid / liquid thermal regulator in LNG tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17211692A JP2899173B2 (en) 1992-06-30 1992-06-30 BOG treatment method and device in liquid / liquid thermal regulator in LNG tank

Publications (2)

Publication Number Publication Date
JPH0617999A JPH0617999A (en) 1994-01-25
JP2899173B2 true JP2899173B2 (en) 1999-06-02

Family

ID=15935854

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17211692A Expired - Lifetime JP2899173B2 (en) 1992-06-30 1992-06-30 BOG treatment method and device in liquid / liquid thermal regulator in LNG tank

Country Status (1)

Country Link
JP (1) JP2899173B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103608632B (en) * 2011-05-30 2016-03-16 瓦锡兰油气系统公司 Utilize the LNG being used for fuel with the system and method for the LPG boil-off gas that liquefies
KR102025785B1 (en) * 2013-06-05 2019-09-26 한국조선해양 주식회사 A Treatment System of Liquefied Natural Gas
CN104449923B (en) * 2014-10-21 2016-06-08 中国海洋石油总公司 A kind of method reducing LNG evaporation capacity

Also Published As

Publication number Publication date
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