JPH08178188A - Method and device for treating vaporized gas generated in liquefied natural gas storage tank - Google Patents
Method and device for treating vaporized gas generated in liquefied natural gas storage tankInfo
- Publication number
- JPH08178188A JPH08178188A JP31791994A JP31791994A JPH08178188A JP H08178188 A JPH08178188 A JP H08178188A JP 31791994 A JP31791994 A JP 31791994A JP 31791994 A JP31791994 A JP 31791994A JP H08178188 A JPH08178188 A JP H08178188A
- Authority
- JP
- Japan
- Prior art keywords
- bog
- lng
- lpg
- reliquefaction
- 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.)
- Pending
Links
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液化天然ガス貯蔵タン
ク内に発生するＢＯＧの処理方法及びその装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating BOG generated in a liquefied natural gas storage tank.
【０００２】[0002]
【従来の技術】図２は従来のＢＯＧ処理装置であって、
１はＬＮＧ貯蔵タンク、２はＢＯＧライン、３は再液化
用熱交換器、４はＬＮＧ払い出しライン、５は再液化Ｂ
ＯＧを一旦貯えるためのドラム、６は再液化ＢＯＧ送出
ライン、７はＬＰＧ添加ライン、８はＢＯＧコンプレッ
サ、９は再液化ＢＯＧ送出ポンプ、１０は気化器であ
る。2. Description of the Related Art FIG. 2 shows a conventional BOG processing apparatus,
1 is an LNG storage tank, 2 is a BOG line, 3 is a heat exchanger for reliquefaction, 4 is an LNG payout line, 5 is a reliquefaction B
A drum for temporarily storing OG, 6 is a reliquefaction BOG delivery line, 7 is an LPG addition line, 8 is a BOG compressor, 9 is a reliquefaction BOG delivery pump, and 10 is a vaporizer.
【０００３】上記従来の処理装置は、ＬＮＧ貯蔵タンク
１から発生するＢＯＧを低コストで高圧送出するため、
この発生するＢＯＧは、コンプレッサ８にて中圧（１０
kgf/cm2 未満）程度に昇圧後熱交換器３に導かれ、冷却
用の払い出しＬＮＧにより再液化される。そして、再液
化ＢＯＧは、ドラム５にいったん貯えられ、次にポンプ
９で送出圧まで昇圧されたのち、払い出しＬＮＧと合流
して気化器１０に送られる。また、ＬＮＧで冷却される
直前のＢＯＧには、ＢＯＧの再液化圧力を低下させるこ
とにより、コンプレッサの動力費を低減する目的で、Ｌ
ＰＧ添加ライン７から一定量のＬＰＧが添加される。In the above-mentioned conventional processing apparatus, since the BOG generated from the LNG storage tank 1 is sent at a high cost at a low cost,
This generated BOG is generated by the compressor 8 at a medium pressure (10
After being pressurized to about (kgf / cm 2 ) or less, it is guided to the heat exchanger 3 and reliquefied by a cooling LNG. Then, the reliquefied BOG is temporarily stored in the drum 5, then boosted to the delivery pressure by the pump 9, and then merged with the delivery LNG and delivered to the vaporizer 10. In addition, for the purpose of reducing the power cost of the compressor by reducing the reliquefaction pressure of the BOG to the BOG immediately before being cooled by the LNG,
A fixed amount of LPG is added from the PG addition line 7.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記従来例の
場合、あらかじめ定められた一組の各種流量の組み合わ
せで再液化運転を行うものであることから、運転状況に
応じて各種流量を決定するという自由度がない。このた
め、例えばＢＯＧの処理量が低下し、ＬＮＧ流量が過大
になりすぎると、添加ＬＰＧが過冷却されて不純物が析
出することがあったり、経済的なＢＯＧの処理運転にな
らないことがある。However, in the case of the above-mentioned conventional example, since the reliquefaction operation is performed by a combination of a predetermined set of various flow rates, various flow rates are determined according to the operating conditions. There is no freedom to say. For this reason, for example, when the amount of BOG treated decreases and the LNG flow rate becomes too large, the added LPG may be overcooled and impurities may be precipitated, or economical BOG treatment operation may not be performed.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記課題を解
決するのが目的であって、その構成は次のとおりであ
る。 １．ＬＮＧ貯蔵タンク内に発生したＢＯＧを加圧後、払
い出しＬＮＧにより冷却して再液化を図り、再液化する
直前のＢＯＧにＬＰＧを添加して再液化圧力を低下させ
るＢＯＧの処理方法において、ＢＯＧ及びＬＰＧ、ＬＮ
Ｇの各流量と、各温度に対するＢＯＧの再液化圧力の関
係を、広範囲に求めて予め関係式をつくり、ＢＯＧの処
理流量、再液化圧力、再液化ＢＯＧの発熱量、ＬＰＧ、
ＬＮＧの使用流量範囲等の要請値に応じて、予め求めて
おいた前記関係式より最適値を算出し、これによりＢＯ
Ｇ、ＬＰＧ、ＬＮＧの使用流量を制御しながら行う液化
天然ガス貯蔵タンク内に発生する蒸発ガスの処理方法。SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and the constitution thereof is as follows. 1. After pressurizing the BOG generated in the LNG storage tank, it is cooled by paying out LNG for reliquefaction, and LPG is added to BOG immediately before reliquefaction to reduce the reliquefaction pressure. LPG, LN
The relation between each flow rate of G and the reliquefaction pressure of BOG with respect to each temperature is obtained over a wide range, and a relational expression is created in advance.
The optimum value is calculated from the relational expression obtained in advance according to the required value such as the range of the flow rate of the LNG used.
A method for treating evaporative gas generated in a liquefied natural gas storage tank, which is performed while controlling the flow rates of G, LPG, and LNG used.
【０００６】２．ＬＮＧ貯蔵タンク内に発生したＢＯＧ
をタンク外に導き出し、これを加圧後、再液化用の熱交
換器に導くＢＯＧラインと、前記貯蔵タンク内のＬＮＧ
を前記熱交換器を経由して払い出すためのＬＮＧ払い出
しラインと、前記熱交換器に入る直前のＢＯＧにＬＰＧ
を添加するためのＬＰＧ添加ラインと、ＢＯＧ処理量許
容範囲、再液化ＢＯＧ発熱量許容範囲、ＬＰＧ使用量許
容範囲、ＬＮＧ使用量許容範囲及び再液化圧力許容範囲
がインプットされていると共に、各流体の圧力、温度、
流量、発熱量、再液化圧力等の要請値が入力され、かつ
各ラインに取り付けたセンサからＢＯＧ、ＬＰＧ、ＬＮ
Ｇの温度変化、圧力、発熱量のインプットを受けて、Ｂ
ＯＧ、ＬＮＧ及びＬＰＧの最適流量を制御する再液化関
係計算器と、から成る液化天然ガス貯蔵タンク内に発生
する蒸発ガスの処理装置。2. BOG generated in LNG storage tank
LNG in the storage tank and the BOG line leading to the heat exchanger for reliquefaction after being pressurized to the outside of the tank.
LNG payout line for paying out the heat via the heat exchanger, and LPG to the BOG immediately before entering the heat exchanger.
LPG addition line for adding BOG treatment amount allowable range, reliquefied BOG heat generation amount allowable range, LPG usage amount allowable range, LNG usage amount allowable range and reliquefaction pressure allowable range are input, and each fluid Pressure, temperature,
Required values such as flow rate, calorific value, reliquefaction pressure, etc. are input, and BOG, LPG, LN from sensors attached to each line.
In response to G temperature changes, pressure, and calorific value inputs, B
A device for processing evaporative gas generated in a liquefied natural gas storage tank, comprising a reliquefaction-related calculator that controls the optimum flow rates of OG, LNG, and LPG.
【０００７】[0007]
【作用】ＢＯＧを再液化用熱交換器で再液化を図る再液
化関係計算器は、ＢＯＧ、ＬＮＧ、ＬＰＧ、再液化ＢＯ
Ｇ等の各種流体の温度、圧力、流量、発熱量等の制御量
のうち、目標値が要請された制御量以外の制御量の最適
値を計算で求め、この値に従って制御する。Operation: The reliquefaction-related calculators for reliquefying BOG with the heat exchanger for reliquefaction are BOG, LNG, LPG, and reliquefaction BO.
Among the control amounts such as the temperature, pressure, flow rate, and heat generation amount of various fluids such as G, the optimum value of the control amount other than the control amount for which the target value is requested is calculated, and the control is performed according to this value.
【０００８】[0008]
【実施例】図１に本発明の一実施例を示す。２はＢＯＧ
ライン、３はＢＯＧ再液化用熱交換器、４はＬＮＧ払い
出しライン、７はＬＰＧ添加ラインである。１１は再液
化関係計算器であって、この計算器１１には、ＢＯＧ及
びＬＰＧ、ＬＮＧの流量、温度に対する再液化圧力の関
係を広範囲に実測により予め求めた関係式がファイルさ
れている。又、この計算器１１には各ラインからＢＯ
Ｇ、ＬＰＧ、ＬＮＧの温度、圧力、流量、発熱量に関す
る情報がインプットされる。さらに計算器１１には、前
記温度、圧力、流量、発熱量等の制御量のうち、必要な
目標値がインプットされる。計算器１１は、これらの数
値を基に、前記関係式より、残りの制御量の最適値を計
算し、この値により制御器１２でＬＮＧ払い出しライン
４に取り付けたＬＮＧ制御弁４ａ及びＬＰＧ添加ライン
７に取り付けたＬＰＧ制御弁７ａ、ＢＯＧライン２に取
り付けたＢＯＧ制御弁２ａを制御する。FIG. 1 shows an embodiment of the present invention. 2 is BOG
Line 3 is a BOG reliquefaction heat exchanger, 4 is an LNG payout line, and 7 is an LPG addition line. Reference numeral 11 denotes a reliquefaction relational calculator, and this calculator 11 stores a relational expression which is obtained by extensively measuring in advance the relation of the reliquefaction pressure with respect to the flow rates and temperatures of BOG, LPG, and LNG. In addition, this calculator 11 has a BO from each line.
Information about the temperature, pressure, flow rate, and calorific value of G, LPG, and LNG is input. Further, a necessary target value among the control amounts such as the temperature, the pressure, the flow rate, and the heat generation amount is input to the calculator 11. The calculator 11 calculates the optimum value of the remaining control amount from the above relational expression based on these numerical values, and the LNG control valve 4a and the LPG addition line attached to the LNG payout line 4 by the controller 12 are calculated by this value. The LPG control valve 7a attached to the BOG line 7 and the BOG control valve 2a attached to the BOG line 2 are controlled.
【０００９】表１は、予め求めた実測に基づき求められ
た再液化条件の関係である。Table 1 shows the relationship of the reliquefaction conditions obtained on the basis of the actual measurement obtained in advance.
【表１】 [Table 1]
【００１０】[0010]
【発明の効果】本発明は以上のように、要請されるＢＯ
Ｇの再液化条件を満たすために、ＬＮＧ流量だけでな
く、ＬＰＧの流量によるコントロールを加え、制御の自
由度を上げたことにより、従来のＬＮＧ流量だけで再液
化圧力をコントロールする場合よりも、コスト的に有利
な使用条件でＢＯＧの再液化操作が可能である。加え
て、添加するＬＰＧ流量も制御されるから、再液化ＢＯ
Ｇの熱量コントロールもできる。As described above, the present invention requires the BO
In order to satisfy the G reliquefaction condition, not only the LNG flow rate but also the LPG flow rate is added to increase the degree of freedom of control, so that the reliquefaction pressure is controlled only by the conventional LNG flow rate. BOG reliquefaction can be performed under cost-effective use conditions. In addition, since the flow rate of LPG added is also controlled, the reliquefied BO
The amount of heat of G can also be controlled.
【図１】本発明に係る液化天然ガス貯蔵タンク内に発生
する蒸発ガスの処理方法及びその装置の説明図。FIG. 1 is an explanatory view of a method and an apparatus for processing evaporative gas generated in a liquefied natural gas storage tank according to the present invention.
【図２】従来の液化天然ガス貯蔵タンク内に発生する蒸
発ガスの処理方法及びその装置の説明図。FIG. 2 is an explanatory view of a conventional method and apparatus for processing evaporated gas generated in a liquefied natural gas storage tank.
【符号の説明】 ２ ＢＯＧライン ２ａ ＢＯＧ制御弁 ３ 熱交換器 ４ ＬＮＧ払い出しライン ４ａ ＬＮＧ制御弁 ７ ＬＰＧ添加ライン ７ａ ＬＰＧ制御弁 １１ 再液化関係計算器 １２ 制御器[Explanation of Codes] 2 BOG Line 2a BOG Control Valve 3 Heat Exchanger 4 LNG Discharge Line 4a LNG Control Valve 7 LPG Addition Line 7a LPG Control Valve 11 Reliquefaction Relational Calculator 12 Controller
Claims (2)
加圧後、払い出しＬＮＧにより冷却して再液化を図り、
再液化する直前のＢＯＧにＬＰＧを添加して再液化圧力
を低下させるＢＯＧの処理方法において、ＢＯＧ及びＬ
ＰＧ、ＬＮＧの各流量と、各温度に対するＢＯＧの再液
化圧力の関係を、広範囲に求めて予め関係式をつくり、
ＢＯＧの処理流量、再液化圧力、再液化ＢＯＧの発熱
量、ＬＰＧ、ＬＮＧの使用流量範囲等の要請値に応じ
て、予め求めておいた前記関係式より最適値を算出し、
これによりＢＯＧ、ＬＰＧ、ＬＮＧの使用流量を制御し
ながら行う液化天然ガス貯蔵タンク内に発生する蒸発ガ
スの処理方法。1. After pressurizing the BOG generated in the LNG storage tank, it is cooled by payout LNG to reliquefy,
In a method for treating BOG in which LPG is added to BOG immediately before reliquefaction to reduce the reliquefaction pressure, BOG and L
The relation between each flow rate of PG and LNG and the reliquefaction pressure of BOG with respect to each temperature is obtained over a wide range and a relational expression is prepared in advance.
The optimum value is calculated from the previously obtained relational expression according to the required values such as the processing flow rate of BOG, the reliquefaction pressure, the heat generation amount of the reliquefaction BOG, the use flow rate range of LPG and LNG,
This is a method for treating evaporative gas generated in the liquefied natural gas storage tank while controlling the flow rates of BOG, LPG, and LNG used.
タンク外に導き出し、これを加圧後、再液化用の熱交換
器に導くＢＯＧラインと、前記貯蔵タンク内のＬＮＧを
前記熱交換器を経由して払い出すためのＬＮＧ払い出し
ラインと、前記熱交換器に入る直前のＢＯＧにＬＰＧを
添加するためのＬＰＧ添加ラインと、ＢＯＧ処理量許容
範囲、再液化ＢＯＧ発熱量許容範囲、ＬＰＧ使用量許容
範囲、ＬＮＧ使用量許容範囲及び再液化圧力許容範囲が
インプットされていると共に、各流体の圧力、温度、流
量、発熱量、再液化圧力等の要請値が入力され、かつ各
ラインに取り付けたセンサからＢＯＧ、ＬＰＧ、ＬＮＧ
の温度変化、圧力、発熱量のインプットを受けて、ＢＯ
Ｇ、ＬＮＧ及びＬＰＧの最適流量を制御する再液化関係
計算器と、 から成る液化天然ガス貯蔵タンク内に発生する蒸発ガス
の処理装置。2. A BOG line for guiding the BOG generated in the LNG storage tank to the outside of the tank, pressurizing the BOG, and guiding it to a heat exchanger for reliquefaction, and LNG in the storage tank for the heat exchanger. LNG delivery line for delivering via via, LPG addition line for adding LPG to BOG immediately before entering the heat exchanger, allowable range of BOG processing amount, allowable range of reliquefied BOG calorific value, amount of LPG used The allowable range, LNG usage amount allowable range, and reliquefaction pressure allowable range are input, and required values such as pressure, temperature, flow rate, calorific value, and reliquefaction pressure of each fluid are also input and attached to each line. From sensors to BOG, LPG, LNG
BO in response to changes in temperature, pressure, and calorific value
A reliquefaction-related calculator that controls the optimal flow rates of G, LNG, and LPG, and a processing device for evaporating gas generated in a liquefied natural gas storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31791994A JPH08178188A (en) | 1994-12-21 | 1994-12-21 | Method and device for treating vaporized gas generated in liquefied natural gas storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31791994A JPH08178188A (en) | 1994-12-21 | 1994-12-21 | Method and device for treating vaporized gas generated in liquefied natural gas storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08178188A true JPH08178188A (en) | 1996-07-12 |
Family
ID=18093516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31791994A Pending JPH08178188A (en) | 1994-12-21 | 1994-12-21 | Method and device for treating vaporized gas generated in liquefied natural gas storage tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08178188A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005314446A (en) * | 2004-04-27 | 2005-11-10 | Ishikawajima Harima Heavy Ind Co Ltd | Apparatus and method for liquefying gas |
| JP2006045327A (en) * | 2004-08-04 | 2006-02-16 | Jfe Engineering Kk | Method and apparatus for controlling dilution of calorific value of natural gas |
| JP2011105955A (en) * | 2011-03-03 | 2011-06-02 | Jfe Engineering Corp | Method of adjusting dilution calorie of natural gas |
| JP2014142021A (en) * | 2013-01-24 | 2014-08-07 | Ihi Corp | Tank facility, and method for transferring cryogenic liquified gas |
| JP2015105740A (en) * | 2013-12-02 | 2015-06-08 | Ｊｆｅエンジニアリング株式会社 | Condensing and mixing device, condensing and mixing method, boil-off gas reliquefying apparatus and boil-off gas reliquefaction method |
| WO2016194049A1 (en) * | 2015-05-29 | 2016-12-08 | Ｊｆｅエンジニアリング株式会社 | Condensing and mixing device, condensing and mixing method, evaporated gas re-liquefaction device, and evaporated gas re-liquefaction method |
| JP2018508706A (en) * | 2015-02-03 | 2018-03-29 | サムスン ヘビー インダストリーズ カンパニー リミテッド | Ship fuel gas supply system |
-
1994
- 1994-12-21 JP JP31791994A patent/JPH08178188A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005314446A (en) * | 2004-04-27 | 2005-11-10 | Ishikawajima Harima Heavy Ind Co Ltd | Apparatus and method for liquefying gas |
| JP2006045327A (en) * | 2004-08-04 | 2006-02-16 | Jfe Engineering Kk | Method and apparatus for controlling dilution of calorific value of natural gas |
| JP4737955B2 (en) * | 2004-08-04 | 2011-08-03 | Ｊｆｅエンジニアリング株式会社 | Natural gas dilution calorie adjustment method and apparatus |
| JP2011105955A (en) * | 2011-03-03 | 2011-06-02 | Jfe Engineering Corp | Method of adjusting dilution calorie of natural gas |
| JP2014142021A (en) * | 2013-01-24 | 2014-08-07 | Ihi Corp | Tank facility, and method for transferring cryogenic liquified gas |
| JP2015105740A (en) * | 2013-12-02 | 2015-06-08 | Ｊｆｅエンジニアリング株式会社 | Condensing and mixing device, condensing and mixing method, boil-off gas reliquefying apparatus and boil-off gas reliquefaction method |
| JP2018508706A (en) * | 2015-02-03 | 2018-03-29 | サムスン ヘビー インダストリーズ カンパニー リミテッド | Ship fuel gas supply system |
| WO2016194049A1 (en) * | 2015-05-29 | 2016-12-08 | Ｊｆｅエンジニアリング株式会社 | Condensing and mixing device, condensing and mixing method, evaporated gas re-liquefaction device, and evaporated gas re-liquefaction method |
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