JP6941448B2 - Liquefied gas fuel ship for transporting liquefied gas - Google Patents

Liquefied gas fuel ship for transporting liquefied gas Download PDF

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JP6941448B2
JP6941448B2 JP2017022199A JP2017022199A JP6941448B2 JP 6941448 B2 JP6941448 B2 JP 6941448B2 JP 2017022199 A JP2017022199 A JP 2017022199A JP 2017022199 A JP2017022199 A JP 2017022199A JP 6941448 B2 JP6941448 B2 JP 6941448B2
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中道　憲治
憲治 中道
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Mitsubishi Heavy Industries Ltd
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本発明は、液ガスを運搬する液化ガス燃料船に関する。 The present invention relates to a liquefied gas fuel ship that carries liquid gas.

従来、例えば、特許文献１には、液化ガスを燃料とし液ガスを運搬する液化ガス運搬用液化ガス燃料船が示されている。ここでは、貨物としての液化ガスのボイルオフガスを再液化する際、液化ガス燃料であるＬＰＧ燃料の冷熱を回収して活用している。 Conventionally, for example, Patent Document 1 discloses a liquefied gas fuel ship for transporting liquefied gas that transports liquefied gas using liquefied gas as fuel. Here, when reliquefying the boil-off gas of the liquefied gas as cargo, the cold heat of the LPG fuel, which is the liquefied gas fuel, is recovered and utilized.

特表２０１４−５１７２３０号公報Special Table 2014-517230 Gazette

上述した特許文献１に記載の発明では、液化ガス燃料は、貨物としての液化ガスのボイルオフガスを再液化するために冷熱を回収された後はガス化して燃料としてエンジンに供給される。 In the invention described in Patent Document 1 described above, the liquefied gas fuel is gasified and supplied to the engine as fuel after the cold heat is recovered in order to reliquefy the boil-off gas of the liquefied gas as cargo.

しかし、燃料タンクに貯留している液化ガス燃料についてもボイルオフガスが発生するため液化ガス燃料用の再液化装置が必要であり、この再液化装置を作動させるために更なるエネルギーが消耗されため、運用コストが増大する問題がある。 However, since boil-off gas is also generated in the liquefied gas fuel stored in the fuel tank, a reliquefaction device for the liquefied gas fuel is required, and further energy is consumed to operate this reliquefaction device. There is a problem that operating costs increase.

本発明は、上述した課題を解決するものであり、液ガスを運搬する液化ガス燃料船において、液化ガス燃料を再液化するための運用コストを低減することのできる液化ガス運搬用液化ガス燃料船を提供することを目的とする。 The present invention solves the above-mentioned problems, and in a liquefied gas fuel ship that transports liquefied gas, a liquefied gas fuel vessel for transporting liquefied gas that can reduce the operating cost for reliquefying the liquefied gas fuel. The purpose is to provide.

本発明の一態様に係る液化ガス運搬用液化ガス燃料船は、液化ガス燃料を燃料として液化ガスを運搬する液化ガス運搬用液化ガス燃料船であって、前記液化ガス燃料を貯留する燃料タンクと、運搬する前記液化ガスを貯留するカーゴタンクと、前記燃料タンクに貯留された前記液化ガス燃料から発生する燃料ボイルオフガスを再液化する燃料再液化装置と、を含み、前記燃料再液化装置は、前記カーゴタンクで発生する液化ガスのボイルオフガスの冷熱により前記燃料ボイルオフガスを冷却する液化ガスボイルオフガス熱交換器を備える。 The liquefied gas fuel ship for transporting liquefied gas according to one aspect of the present invention is a liquefied gas fuel ship for transporting liquefied gas using liquefied gas fuel as fuel, and has a fuel tank for storing the liquefied gas fuel. The fuel reliquefaction apparatus includes a cargo tank for storing the liquefied gas to be transported and a fuel reliquefaction apparatus for reliquefying the fuel boil-off gas generated from the liquefied gas fuel stored in the fuel tank. A liquefied gas boil-off gas heat exchanger that cools the fuel boil-off gas by cooling the boil-off gas of the liquefied gas generated in the cargo tank is provided.

また、本発明の一態様に係る液化ガス運搬用液化ガス燃料船では、前記燃料再液化装置は、前記燃料タンクで発生する前記燃料ボイルオフガスを多段で順次冷却する複数段の冷却装置を含み、前記液化ガスボイルオフガス熱交換器は、最終段の前記冷却装置に設けられることが好ましい。 Further, in the liquefied gas fuel ship for transporting liquefied gas according to one aspect of the present invention, the fuel reliquefaction device includes a multi-stage cooling device for sequentially cooling the fuel boil-off gas generated in the fuel tank in multiple stages. The liquefied gas boil-off gas heat exchanger is preferably provided in the cooling device at the final stage.

また、本発明の一態様に係る液化ガス運搬用液化ガス燃料船では、前記液化ガスボイルオフガス熱交換器を経た前記ボイルオフガスを圧縮するボイルオフガス圧縮機と、前記ボイルオフガス圧縮機で圧縮された前記ボイルオフガスを凝縮させるボイルオフガス凝縮器と、前記ボイルオフガス凝縮器で凝縮された前記ボイルオフガスを膨張させるボイルオフガス膨張弁と、を含み、前記ボイルオフガスを再液化して前記カーゴタンクに戻すことが好ましい。 Further, in the liquefied gas fuel ship for transporting liquefied gas according to one aspect of the present invention, the boil-off gas compressor for compressing the boil-off gas that has passed through the liquefied gas boil-off gas heat exchanger and the boil-off gas compressor are used for compression. Reliquefying the boil-off gas and returning it to the cargo tank, including a boil-off gas condenser for condensing the boil-off gas and a boil-off gas expansion valve for expanding the boil-off gas condensed by the boil-off gas condenser. Is preferable.

また、本発明の一態様に係る液化ガス運搬用液化ガス燃料船では、前記燃料タンクの前記液化ガス燃料をエンジンに供給する燃料供給ラインに設けられて前記ボイルオフガス凝縮器で凝縮された前記ボイルオフガスとの熱交換により前記液化ガス燃料を気化させる一方で前記ボイルオフガスを冷却する気化装置をさらに備えることが好ましい。 Further, in the liquefied gas fuel ship for transporting liquefied gas according to one aspect of the present invention, the boil-off provided in the fuel supply line for supplying the liquefied gas fuel to the engine in the fuel tank and condensed by the boil-off gas condenser. It is preferable to further include a vaporizer that cools the boil-off gas while vaporizing the liquefied gas fuel by heat exchange with the gas.

また、本発明の一態様に係る液化ガス運搬用液化ガス燃料船では、前記液化ガス燃料は、沸点が前記液化ガス以下であることが好ましい。 Further, in the liquefied gas fuel ship for transporting liquefied gas according to one aspect of the present invention, the liquefied gas fuel preferably has a boiling point equal to or lower than that of the liquefied gas.

また、本発明の一態様に係る液化ガス運搬用液化ガス燃料船では、前記液化ガス燃料はＬＮＧであり、前記液化ガスはエタンであることが好ましい。 Further, in the liquefied gas fuel ship for transporting liquefied gas according to one aspect of the present invention, it is preferable that the liquefied gas fuel is LNG and the liquefied gas is ethane.

本発明によれば、液化ガスボイルオフガス熱交換器において、燃料タンクで発生した液化ガス燃料の燃料ボイルオフガスの再液化に、カーゴタンクで発生する液化ガスのボイルオフガスの冷熱を利用するため冷却効率を向上することができ、再液化の動力を低減し運用コストを低減することができる。 According to the present invention, in the liquefied gas boil-off gas heat exchanger, the cold heat of the boil-off gas of the liquefied gas generated in the cargo tank is used for reliquefaction of the fuel boil-off gas of the liquefied gas fuel generated in the fuel tank, so that the cooling efficiency is reduced. Can be improved, the power of reliquefaction can be reduced, and the operating cost can be reduced.

図１は、本発明の実施形態に係る液化ガス運搬用液化ガス燃料船の概略図である。FIG. 1 is a schematic view of a liquefied gas fuel ship for transporting liquefied gas according to an embodiment of the present invention. 図２は、本発明の実施形態に係る液化ガス運搬用液化ガス燃料船の他の例の概略図である。FIG. 2 is a schematic view of another example of a liquefied gas fuel ship for transporting liquefied gas according to the embodiment of the present invention. 図３は、本発明の実施形態に係る液化ガス運搬用液化ガス燃料船の他の例の概略図である。FIG. 3 is a schematic view of another example of a liquefied gas fuel ship for transporting liquefied gas according to the embodiment of the present invention.

以下に、本発明に係る実施形態を図面に基づいて詳細に説明する。なお、この実施形態によりこの発明が限定されるものではない。また、下記実施形態における構成要素には、当業者が置換可能かつ容易なもの、あるいは実質的に同一のものが含まれる。 Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

図１は、本実施形態に係る液化ガス運搬用液化ガス燃料船の概略図である。 FIG. 1 is a schematic view of a liquefied gas fuel ship for transporting liquefied gas according to the present embodiment.

本実施形態の液化ガス運搬用液化ガス燃料船は、液化ガス燃料を燃料として液化ガスを運搬するものである。この液化ガス運搬用液化ガス燃料船は、液化ガス燃料を貯留する燃料タンク１と、船舶を推進させるための動力源となるエンジン３と、燃料タンク１に貯留された液化ガス燃料を気化させてエンジン３に供給する燃料供給部５と、燃料タンク１に貯留された液化ガス燃料の燃料ボイルオフガスを再液化する燃料再液化装置７と、運搬される液化ガスを貯留するカーゴタンク９と、カーゴタンク９に貯留された液化ガスのボイルオフガスを燃料再液化装置７に送るボイルオフガス供給部１１と、を含み構成される。 The liquefied gas fuel ship for transporting liquefied gas of the present embodiment transports liquefied gas using liquefied gas fuel as fuel. This liquefied gas fuel ship for transporting liquefied gas vaporizes the fuel tank 1 for storing the liquefied gas fuel, the engine 3 which is the power source for propelling the ship, and the liquefied gas fuel stored in the fuel tank 1. A fuel supply unit 5 supplied to the engine 3, a fuel reliquefaction device 7 for reliquefying the fuel boil-off gas of the liquefied gas fuel stored in the fuel tank 1, a cargo tank 9 for storing the liquefied gas to be transported, and a cargo. It includes a boil-off gas supply unit 11 that sends the boil-off gas of the liquefied gas stored in the tank 9 to the fuel reliquefaction device 7.

ここで、液化ガス燃料は、沸点が液化ガス以下であり、具体的に燃料タンク１に貯留されて船舶を推進させるためのエンジン３の燃料となる液化ガス燃料はＬＮＧであり、カーゴタンク９に貯留されて運搬される液化ガスはエタンである。 Here, the liquefied gas fuel has a boiling point equal to or lower than that of the liquefied gas, and the liquefied gas fuel that is specifically stored in the fuel tank 1 and serves as the fuel for the engine 3 for propelling the ship is LNG, and is stored in the cargo tank 9. The liquefied gas stored and transported is ethane.

燃料タンク１は、液化ガス燃料を貯留する密閉容器である。 The fuel tank 1 is a closed container for storing liquefied gas fuel.

エンジン３は、液化ガス燃料を気化させた気化ガスを燃料として燃焼させることで船舶の推進力となる駆動力を発生させるガスエンジンが用いられる。 As the engine 3, a gas engine that generates a driving force that becomes a propulsive force for a ship is used by burning vaporized gas obtained by vaporizing liquefied gas fuel as fuel.

燃料供給部５は、燃料タンク１とエンジン３とを連通する燃料供給ライン５Ａと、燃料供給ライン５Ａの途中に設けられて燃料タンク１に貯留された液化ガス燃料を燃料供給ライン５Ａを介してエンジン３に送る燃料供給ポンプ５Ｂと、燃料供給ライン５Ａの途中に設けられて燃料供給ポンプ５Ｂによりエンジン３に送られる途中の液化ガス燃料の冷熱を回収することで気化させて気化ガスとする気化装置５Ｃと、を含み、燃料タンク１に貯留された液化ガス燃料を気化させてエンジン３に供給する。気化装置５Ｃは、気化用熱交換器であり、液化ガス燃料と、液化ガス燃料の冷熱を回収する気化用冷媒とを非接触な状態で通過させて相互間の熱交換を行う。 The fuel supply unit 5 uses the fuel supply line 5A that connects the fuel tank 1 and the engine 3 and the liquefied gas fuel that is provided in the middle of the fuel supply line 5A and stored in the fuel tank 1 via the fuel supply line 5A. A fuel supply pump 5B to be sent to the engine 3 and a liquefied gas fuel provided in the middle of the fuel supply line 5A and being sent to the engine 3 by the fuel supply pump 5B. The liquefied gas fuel stored in the fuel tank 1 including the device 5C is vaporized and supplied to the engine 3. The vaporizer 5C is a heat exchanger for vaporization, and passes the liquefied gas fuel and the vaporizing refrigerant for recovering the cold heat of the liquefied gas fuel in a non-contact state to exchange heat between them.

燃料再液化装置７は、複数段（本実施形態では２段）の冷却装置７Ａ，７Ｂと、液化ガス燃料の燃料ボイルオフガスを循環させる燃料ボイルオフガス循環ライン７Ｃと、を含み、複数段の冷却装置７Ａ，７Ｂにより液化ガス燃料の燃料ボイルオフガスを多段で冷却する。本実施形態では２段の冷却装置７Ａ，７Ｂとし、初段の冷却装置７Ａと、最終段の冷却装置７Ｂとで構成される。 The fuel reliquefaction device 7 includes a plurality of stages (two stages in this embodiment) of cooling devices 7A and 7B, and a fuel boil-off gas circulation line 7C for circulating the fuel boil-off gas of the liquefied gas fuel. The fuel boil-off gas of the liquefied gas fuel is cooled in multiple stages by the devices 7A and 7B. In the present embodiment, the two-stage cooling devices 7A and 7B are used, and the first-stage cooling device 7A and the final-stage cooling device 7B are configured.

初段の冷却装置７Ａは、冷媒循環ライン７Ａａと、燃料再液化圧縮機７Ａｂと、燃料再液化再生熱交換器７Ａｃと、燃料再液化膨張機７Ａｄと、冷却部７Ａｅと、を含む。冷媒循環ライン７Ａａは、冷媒を循環させる循環経路を形成するもので、燃料再液化圧縮機７Ａｂ、燃料再液化再生熱交換器７Ａｃ、燃料再液化膨張機７Ａｄ、および冷却部７Ａｅが設けられている。燃料再液化圧縮機７Ａｂは、冷媒を圧縮する。燃料再液化圧縮機７Ａｂは、モータやタービンなどの駆動部７Ａｆにより駆動される。図１では、駆動部７Ａｆと燃料再液化圧縮機７Ａｂとを直結して示しているが、減速機（図示せず）が設けられている。燃料再液化再生熱交換器７Ａｃは、燃料再液化圧縮機７Ａｂで圧縮された冷媒を、冷却部７Ａｅにて冷熱を奪われた後の低温冷媒と熱交換して冷却させる。燃料再液化膨張機７Ａｄは、燃料再液化再生熱交換器７Ａｃで冷却された冷媒を膨張させて燃料ボイルオフガスを冷却するための冷熱を生成する。燃料再液化膨張機７Ａｄは、燃料再液化圧縮機７Ａｂの駆動軸に接続されて燃料再液化圧縮機７Ａｂと共に駆動部７Ａｆにより駆動される。冷却部７Ａｅは、燃料再液化膨張機７Ａｄで冷熱を生成された冷媒により燃料ボイルオフガスを冷却させる。冷却部７Ａｅで燃料ボイルオフガスを冷却し冷熱を奪われた後の低温冷媒は、上述のとおり燃料再液化圧縮機７Ａｂで圧縮された冷媒を燃料再液化再生熱交換器７Ａｃにおいて冷却した後、燃料再液化圧縮機７Ａｂで圧縮される。 The first-stage cooling device 7A includes a refrigerant circulation line 7Aa, a fuel reliquefaction compressor 7Ab, a fuel reliquefaction regenerative heat exchanger 7Ac, a fuel reliquefaction expander 7Ad, and a cooling unit 7Ae. The refrigerant circulation line 7Aa forms a circulation path for circulating the refrigerant, and is provided with a fuel reliquefaction compressor 7Ab, a fuel reliquefaction regenerative heat exchanger 7Ac, a fuel reliquefaction expander 7Ad, and a cooling unit 7Ae. .. The fuel reliquefaction compressor 7Ab compresses the refrigerant. The fuel reliquefaction compressor 7Ab is driven by a drive unit 7Af such as a motor or a turbine. In FIG. 1, the drive unit 7Af and the fuel reliquefaction compressor 7Ab are directly connected to each other, but a speed reducer (not shown) is provided. The fuel reliquefaction regenerative heat exchanger 7Ac cools the refrigerant compressed by the fuel reliquefaction compressor 7Ab by exchanging heat with the low-temperature refrigerant after the cooling heat is taken away by the cooling unit 7Ae. The fuel reliquefaction expander 7Ad expands the refrigerant cooled by the fuel reliquefaction regenerative heat exchanger 7Ac to generate cold heat for cooling the fuel boil-off gas. The fuel reliquefaction expander 7Ad is connected to the drive shaft of the fuel reliquefaction compressor 7Ab and is driven by the drive unit 7Af together with the fuel reliquefaction compressor 7Ab. The cooling unit 7Ae cools the fuel boil-off gas with the refrigerant generated by the fuel reliquefaction expander 7Ad. The low-temperature refrigerant after the fuel boil-off gas is cooled by the cooling unit 7Ae and deprived of cold heat is obtained by cooling the refrigerant compressed by the fuel reliquefaction compressor 7Ab in the fuel reliquefaction regenerative heat exchanger 7Ac as described above, and then fueling the refrigerant. It is compressed by the reliquefaction compressor 7Ab.

最終段の冷却装置７Ｂは、冷媒循環ライン７Ｂａと、燃料再液化圧縮機７Ｂｂと、燃料再液化再生熱交換器７Ｂｃと、燃料再液化膨張機７Ｂｄと、冷却部７Ｂｅと、液化ガスボイルオフガス熱交換器７Ｂｇと、を含む。冷媒循環ライン７Ｂａは、冷媒を循環させる循環経路を形成するもので、燃料再液化圧縮機７Ｂｂ、燃料再液化再生熱交換器７Ｂｃ、燃料再液化膨張機７Ｂｄ、および冷却部７Ｂｅが設けられている。燃料再液化圧縮機７Ｂｂは、冷媒を圧縮する。燃料再液化圧縮機７Ｂｂは、モータやタービンなどの駆動部７Ｂｆにより駆動される。図１では、駆動部７Ｂｆと燃料再液化圧縮機７Ｂｂとを直結して示しているが、減速機（図示せず）が設けられている。燃料再液化再生熱交換器７Ｂｃは、燃料再液化圧縮機７Ｂｂで圧縮された冷媒を、冷却部７Ｂｅにて冷熱を奪われた後の低温冷媒と熱交換して冷却させる。燃料再液化膨張機７Ｂｄは、燃料再液化再生熱交換器７Ｂｃで冷却された冷媒を膨張させて燃料ボイルオフガスを冷却するための冷熱を生成する。燃料再液化膨張機７Ｂｄは、燃料再液化圧縮機７Ｂｂの駆動軸に接続されて燃料再液化圧縮機７Ｂｂと共に駆動部７Ｂｆにより駆動される。冷却部７Ｂｅは、燃料再液化膨張機７Ｂｄで冷熱を生成された冷媒により燃料ボイルオフガスを冷却させる。冷却部７Ｂｅで燃料ボイルオフガスを冷却し冷熱を奪われた後の低温冷媒は、上述のとおり燃料再液化圧縮機７Ｂｂで圧縮された冷媒を燃料再液化再生熱交換器７Ｂｃにおいて冷却した後、燃料再液化圧縮機７Ｂｂで圧縮される。また、液化ガスボイルオフガス熱交換器７Ｂｇは、冷媒循環ライン７Ｂａにおいて、燃料再液化圧縮機７Ｂｂと燃料再液化再生熱交換器７Ｂｃとの間に設けられ、燃料再液化圧縮機７Ｂｂで圧縮された冷媒を、カーゴタンク９で発生する液化ガスのボイルオフガスの冷熱と熱交換して冷却させる。従って、燃料再液化再生熱交換器７Ｂｃでは、液化ガスボイルオフガス熱交換器７Ｂｇにおいて液化ガスのボイルオフガスで冷却された冷媒を、冷却部７Ｂｅにて冷熱を奪われた後の低温冷媒と熱交換してさらに冷却させる。このため、最終段の冷却装置７Ｂは、カーゴタンク９で発生する液化ガスのボイルオフガスの冷熱を利用して冷却効率が向上する。 The final stage cooling device 7B includes a refrigerant circulation line 7Ba, a fuel reliquefaction compressor 7Bb, a fuel reliquefaction regenerative heat exchanger 7Bc, a fuel reliquefaction expander 7Bd, a cooling unit 7Be, and a liquefied gas boil-off gas heat. Includes a exchanger of 7 Bg. The refrigerant circulation line 7Ba forms a circulation path for circulating the refrigerant, and is provided with a fuel reliquefaction compressor 7Bb, a fuel reliquefaction regenerative heat exchanger 7Bc, a fuel reliquefaction expander 7Bd, and a cooling unit 7Be. .. The fuel reliquefaction compressor 7Bb compresses the refrigerant. The fuel reliquefaction compressor 7Bb is driven by a drive unit 7Bf such as a motor or a turbine. In FIG. 1, the drive unit 7Bf and the fuel reliquefaction compressor 7Bb are directly connected to each other, but a speed reducer (not shown) is provided. The fuel reliquefaction regenerative heat exchanger 7Bc cools the refrigerant compressed by the fuel reliquefaction compressor 7Bb by exchanging heat with the low-temperature refrigerant after the cooling heat is taken away by the cooling unit 7Be. The fuel reliquefaction expander 7Bd expands the refrigerant cooled by the fuel reliquefaction regenerative heat exchanger 7Bc to generate cold heat for cooling the fuel boil-off gas. The fuel reliquefaction expander 7Bd is connected to the drive shaft of the fuel reliquefaction compressor 7Bb and is driven by the drive unit 7Bf together with the fuel reliquefaction compressor 7Bb. The cooling unit 7Be cools the fuel boil-off gas with the refrigerant generated by the fuel reliquefaction expander 7Bd. The low-temperature refrigerant after the fuel boil-off gas is cooled by the cooling unit 7Be and deprived of cold heat is obtained by cooling the refrigerant compressed by the fuel reliquefaction compressor 7Bb in the fuel reliquefaction regenerative heat exchanger 7Bc as described above, and then fueling the refrigerant. It is compressed by the reliquefaction compressor 7Bb. Further, the liquefied gas boil-off gas heat exchanger 7Bg was provided between the fuel reliquefaction compressor 7Bb and the fuel reliquefaction regenerative heat exchanger 7Bc in the refrigerant circulation line 7Ba, and was compressed by the fuel reliquefaction compressor 7Bb. The refrigerant is cooled by exchanging heat with the cold heat of the boil-off gas of the liquefied gas generated in the cargo tank 9. Therefore, in the fuel reliquefaction regenerative heat exchanger 7Bc, the refrigerant cooled by the liquefied gas boil-off gas in the liquefied gas boil-off gas heat exchanger 7Bg is exchanged with the low-temperature refrigerant after the cooling heat is taken away by the cooling unit 7Be. And let it cool further. Therefore, the cooling device 7B in the final stage improves the cooling efficiency by utilizing the cold heat of the boil-off gas of the liquefied gas generated in the cargo tank 9.

燃料ボイルオフガス循環ライン７Ｃは、燃料タンク１で発生した液化ガス燃料の燃料ボイルオフガスを冷却装置７Ａの冷却部７Ａｅおよび冷却装置７Ｂの冷却部７Ｂｅに供給して冷却させて液化ガス燃料として再液化させて燃料タンク１に戻す。燃料ボイルオフガス循環ライン７Ｃは、燃料タンク１と冷却装置７Ａとの間に送風機７Ｃａが設けられており、まず、燃料タンク１で発生した液化ガス燃料の燃料ボイルオフガスを冷却装置７Ａの冷却部７Ａｅに供給して冷却させ、次に、冷却装置７Ｂの冷却部７Ｂｅに供給して冷却させて再液化させる。 The fuel boil-off gas circulation line 7C supplies the fuel boil-off gas of the liquefied gas fuel generated in the fuel tank 1 to the cooling unit 7Ae of the cooling device 7A and the cooling unit 7Be of the cooling device 7B to cool the fuel and reliquefy it as the liquefied gas fuel. And return it to the fuel tank 1. In the fuel boil-off gas circulation line 7C, a blower 7Ca is provided between the fuel tank 1 and the cooling device 7A. First, the fuel boil-off gas of the liquefied gas fuel generated in the fuel tank 1 is cooled by the cooling unit 7Ae of the cooling device 7A. Then, it is supplied to the cooling unit 7Be of the cooling device 7B to be cooled and reliquefied.

ボイルオフガス供給部１１は、カーゴタンク９で発生した液化ガスのボイルオフガスを冷却装置７Ｂの液化ガスボイルオフガス熱交換器７Ｂｇに供給させて冷媒の冷却に供する。ボイルオフガス供給部１１は、ボイルオフガス循環ライン１１Ａと、ボイルオフガス圧縮機１１Ｂと、ボイルオフガス凝縮器１１Ｃと、ボイルオフガス膨張弁１１Ｄと、を含む。ボイルオフガス循環ライン１１Ａは、カーゴタンク９で発生した液化ガスのボイルオフガスを冷却装置７Ｂの液化ガスボイルオフガス熱交換器７Ｂｇに供給して冷却装置７Ｂの冷媒の冷却に供する。また、ボイルオフガス循環ライン１１Ａは、冷却装置７Ｂの液化ガスボイルオフガス熱交換器７Ｂｇで冷媒の冷却に供したボイルオフガスをボイルオフガス圧縮機１１Ｂ、ボイルオフガス凝縮器１１Ｃ、ボイルオフガス膨張弁１１Ｄの順に供給し、カーゴタンク９に戻す。即ち、ボイルオフガス圧縮機１１Ｂは、冷却装置７Ｂの液化ガスボイルオフガス熱交換器７Ｂｇで冷媒の冷却に供したボイルオフガスを圧縮する。ボイルオフガス凝縮器１１Ｃは、ボイルオフガス圧縮機１１Ｂで圧縮されたボイルオフガスを凝縮させる。ボイルオフガス凝縮器１１Ｃで、ボイルオフガスを凝縮させるための熱交換の冷媒には海水が用いられる。ボイルオフガス膨張弁１１Ｄは、ボイルオフガス凝縮器１１Ｃで凝縮されたボイルオフガスを膨張させる。従って、冷却装置７Ｂの液化ガスボイルオフガス熱交換器７Ｂｇで冷媒の冷却に供したボイルオフガスは、ボイルオフガス圧縮機１１Ｂ、ボイルオフガス凝縮器１１Ｃ、ボイルオフガス膨張弁１１Ｄを経て冷却されて液化してカーゴタンク９に戻される。 The boil-off gas supply unit 11 supplies the boil-off gas of the liquefied gas generated in the cargo tank 9 to the liquefied gas boil-off gas heat exchanger 7Bg of the cooling device 7B to cool the refrigerant. The boil-off gas supply unit 11 includes a boil-off gas circulation line 11A, a boil-off gas compressor 11B, a boil-off gas condenser 11C, and a boil-off gas expansion valve 11D. The boil-off gas circulation line 11A supplies the boil-off gas of the liquefied gas generated in the cargo tank 9 to the liquefied gas boil-off gas heat exchanger 7Bg of the cooling device 7B to cool the refrigerant of the cooling device 7B. Further, in the boil-off gas circulation line 11A, the boil-off gas used for cooling the refrigerant by the liquefied gas boil-off gas heat exchanger 7Bg of the cooling device 7B is sent in the order of the boil-off gas compressor 11B, the boil-off gas condenser 11C, and the boil-off gas expansion valve 11D. Supply and return to cargo tank 9. That is, the boil-off gas compressor 11B compresses the boil-off gas used for cooling the refrigerant by the liquefied gas boil-off gas heat exchanger 7Bg of the cooling device 7B. The boil-off gas condenser 11C condenses the boil-off gas compressed by the boil-off gas compressor 11B. In the boil-off gas condenser 11C, seawater is used as a heat exchange refrigerant for condensing the boil-off gas. The boil-off gas expansion valve 11D expands the boil-off gas condensed by the boil-off gas condenser 11C. Therefore, the boil-off gas used for cooling the refrigerant by the liquefied gas boil-off gas heat exchanger 7Bg of the cooling device 7B is cooled and liquefied through the boil-off gas compressor 11B, the boil-off gas condenser 11C, and the boil-off gas expansion valve 11D. Returned to cargo tank 9.

ここで、ボイルオフガス循環ライン１１Ａは、ボイルオフガス凝縮器１１Ｃとボイルオフガス膨張弁１１Ｄとの間で、燃料供給部５における気化装置５Ｃを経由し、ボイルオフガスを気化装置５Ｃにおける気化用冷媒として供し、ボイルオフガスを液化ガス燃料の冷熱により冷却させる。このため、冷却装置７Ｂの液化ガスボイルオフガス熱交換器７Ｂｇで冷媒の冷却に供したボイルオフガスがボイルオフガス凝縮器１１Ｃとボイルオフガス膨張弁１１Ｄとの間で気化装置５Ｃにより冷却されて液化効率が向上する。 Here, the boil-off gas circulation line 11A provides the boil-off gas as a vaporizing refrigerant in the vaporization device 5C between the boil-off gas condenser 11C and the boil-off gas expansion valve 11D via the vaporization device 5C in the fuel supply unit 5. , The boil-off gas is cooled by the cold heat of the liquefied gas fuel. Therefore, the boil-off gas used for cooling the refrigerant by the liquefied gas boil-off gas heat exchanger 7Bg of the cooling device 7B is cooled by the vaporizer 5C between the boil-off gas condenser 11C and the boil-off gas expansion valve 11D, and the liquefaction efficiency is improved. improves.

このように、本実施形態の液化ガス運搬用液化ガス燃料船は、液化ガス燃料を貯留する燃料タンク１と、運搬する液化ガスを貯留するカーゴタンク９と、燃料タンク１に貯留された液化ガス燃料から発生する燃料ボイルオフガスを再液化する燃料再液化装置７と、を含み、燃料再液化装置７は、カーゴタンク９で発生する液化ガスのボイルオフガスの冷熱により燃料ボイルオフガスを冷却する液化ガスボイルオフガス熱交換器７Ｂｇを備える。この液化ガス運搬用液化ガス燃料船によれば、液化ガスボイルオフガス熱交換器７Ｂｇにおいて、燃料タンク１で発生した液化ガス燃料の燃料ボイルオフガスの再液化に、カーゴタンク９で発生する液化ガスのボイルオフガスの冷熱を利用するため冷却効率を向上することができ、再液化の動力を低減し運用コストを低減することができる。 As described above, in the liquefied gas fuel ship for transporting liquefied gas of the present embodiment, the fuel tank 1 for storing the liquefied gas fuel, the cargo tank 9 for storing the liquefied gas to be transported, and the liquefied gas stored in the fuel tank 1. The fuel reliquefaction device 7 includes a fuel reliquefaction device 7 that reliquefies the fuel boil-off gas generated from the fuel, and the fuel reliquefaction device 7 is a liquefied gas that cools the fuel boil-off gas by the cold heat of the boil-off gas of the liquefied gas generated in the cargo tank 9. It is equipped with a boil-off gas heat exchanger 7 Bg. According to this liquefied gas fuel ship for transporting liquefied gas, in the liquefied gas boil-off gas heat exchanger 7Bg, the liquefied gas generated in the cargo tank 9 is used for reliquefaction of the fuel boil-off gas of the liquefied gas fuel generated in the fuel tank 1. Since the cold heat of the boil-off gas is used, the cooling efficiency can be improved, the power for reliquefaction can be reduced, and the operating cost can be reduced.

また、本実施形態の液化ガス運搬用液化ガス燃料船では、燃料再液化装置７は、燃料タンク１で発生する燃料ボイルオフガスを多段で順次冷却する複数段の冷却装置７Ａ，７Ｂを含み、液化ガスボイルオフガス熱交換器７Ｂｇは、最終段の冷却装置７Ｂに設けられることが好ましい。この液化ガス運搬用液化ガス燃料船によれば、複数段の冷却装置７Ａ，７Ｂにより段階的に徐々に冷却する場合、最終段の冷却装置７Ｂは、最も温度の低い冷媒が必要であるため、ここでの冷却効率を向上することで、再液化の運用コストをより低減することができる。 Further, in the liquefied gas fuel ship for transporting liquefied gas of the present embodiment, the fuel reliquefaction device 7 includes a plurality of stages of cooling devices 7A and 7B for sequentially cooling the fuel boil-off gas generated in the fuel tank 1 in multiple stages, and liquefies the fuel. The gas boil-off gas heat exchanger 7Bg is preferably provided in the final stage cooling device 7B. According to this liquefied gas fuel ship for transporting liquefied gas, when the cooling devices 7A and 7B in a plurality of stages are used for gradual cooling in stages, the cooling device 7B in the final stage requires a refrigerant having the lowest temperature. By improving the cooling efficiency here, the operating cost of reliquefaction can be further reduced.

また、本実施形態の液化ガス運搬用液化ガス燃料船では、液化ガスボイルオフガス熱交換器７Ｂｇを経たボイルオフガスを圧縮するボイルオフガス圧縮機１１Ｂと、ボイルオフガス圧縮機１１Ｂで圧縮されたボイルオフガスを凝縮させるボイルオフガス凝縮器１１Ｃと、ボイルオフガス凝縮器１１Ｃで凝縮されたボイルオフガスを膨張させるボイルオフガス膨張弁１１Ｄと、を含み、ボイルオフガスを再液化してカーゴタンク９に戻すことが好ましい。この液化ガス運搬用液化ガス燃料船によれば、ボイルオフガスを再液化してカーゴタンク９に戻すことで、カーゴタンク９の液化ガスを確保することができる。 Further, in the liquefied gas fuel ship for transporting liquefied gas of the present embodiment, the boil-off gas compressor 11B for compressing the boil-off gas that has passed through the liquefied gas boil-off gas heat exchanger 7 Bg and the boil-off gas compressed by the boil-off gas compressor 11B are used. It is preferable that the boil-off gas condenser 11C for condensing and the boil-off gas expansion valve 11D for expanding the boil-off gas condensed by the boil-off gas condenser 11C are included, and the boil-off gas is reliquefied and returned to the cargo tank 9. According to this liquefied gas fuel ship for transporting liquefied gas, the liquefied gas in the cargo tank 9 can be secured by reliquefying the boil-off gas and returning it to the cargo tank 9.

また、本実施形態の液化ガス運搬用液化ガス燃料船では、燃料タンク１の液化ガス燃料をエンジン３に供給する燃料供給ライン５Ａに設けられてボイルオフガス凝縮器１１Ｃで凝縮されたボイルオフガスとの熱交換により液化ガス燃料を気化させる一方でボイルオフガスを冷却する気化装置５Ｃをさらに備えることが好ましい。この液化ガス運搬用液化ガス燃料船によれば、液化ガス燃料を気化させる熱交換にボイルオフガス凝縮器１１Ｃで凝縮されたボイルオフガスを利用することで、液化ガス燃料の気化と、ボイルオフガスの冷却とを共に効率的に行うことができる。 Further, in the liquefied gas fuel ship for transporting liquefied gas of the present embodiment, the boil-off gas is provided in the fuel supply line 5A for supplying the liquefied gas fuel of the fuel tank 1 to the engine 3 and condensed by the boil-off gas condenser 11C. It is preferable to further include a vaporizer 5C that cools the boil-off gas while vaporizing the liquefied gas fuel by heat exchange. According to this liquefied gas fuel ship for transporting liquefied gas, the liquefied gas fuel is vaporized and the boil-off gas is cooled by using the boil-off gas condensed by the boil-off gas condenser 11C for heat exchange to vaporize the liquefied gas fuel. Can be done efficiently together with.

また、本実施形態の液化ガス運搬用液化ガス燃料船では、液化ガス燃料は、沸点が液化ガス以下であることが好ましい。即ち、上述した実施形態において、燃料タンク１に貯留されて船舶を推進させるためのエンジン３の燃料となる液化ガス燃料は、沸点が、カーゴタンク９に貯留されて運搬される液化ガス以下であることが好ましい。この液化ガス運搬用液化ガス燃料船によれば、沸点が低い液化ガス燃料は、再液化の動力が液化ガスよりも多大に必要であり、この動力を沸点が高い液化ガスの冷熱を利用することで、液化ガス燃料の再液化の効率を向上し、液化ガス燃料の再液化の多大な動力の低減化を図ることができる。 Further, in the liquefied gas fuel ship for transporting liquefied gas of the present embodiment, the liquefied gas fuel preferably has a boiling point of liquefied gas or less. That is, in the above-described embodiment, the liquefied gas fuel stored in the fuel tank 1 and used as the fuel for the engine 3 for propelling the ship has a boiling point equal to or lower than the liquefied gas stored in the cargo tank 9 and transported. Is preferable. According to this liquefied gas fuel ship for transporting liquefied gas, liquefied gas fuel having a low boiling point requires much more power for reliquefaction than liquefied gas, and this power is to utilize the cold heat of the liquefied gas having a high boiling point. Therefore, the efficiency of reliquefaction of the liquefied gas fuel can be improved, and the power for reliquefaction of the liquefied gas fuel can be significantly reduced.

また、本実施形態の液化ガス運搬用液化ガス燃料船では、液化ガス燃料はＬＮＧであり、液化ガスはエタンであることが好ましい。この液化ガス運搬用液化ガス燃料船によれば、ＬＮＧは沸点が−１６３℃程度で、エタンは沸点が−１００℃程度である。そして、相互の沸点の差は、ＬＮＧの再液化をエタンの冷熱の利用により効率的に助勢することができ、ＬＮＧの再液化の多大な動力の低減化を効率良く図ることができる。また、ＬＮＧは、重油などの燃料と比較して、ＳＯＸ、ＮＯＸ、ＣＯ２を低減することができ環境に良く、価格も低く運用コストを低減する観点から好ましい。 Further, in the liquefied gas fuel ship for transporting liquefied gas of the present embodiment, it is preferable that the liquefied gas fuel is LNG and the liquefied gas is ethane. According to this liquefied gas fuel ship for transporting liquefied gas, LNG has a boiling point of about -163 ° C, and ethane has a boiling point of about -100 ° C. The difference in boiling points between them can efficiently assist the reliquefaction of LNG by utilizing the cold heat of ethane, and can efficiently reduce the great power of the reliquefaction of LNG. Also, LNG, as compared to fuels such as heavy oil, SO X, NO X, good environmental can be reduced CO 2, price from the viewpoint of reducing the operating costs low.

なお、液化ガス燃料がＬＮＧの場合、カーゴタンク９に貯留されて運搬対象となる液化ガスは、エタンの他に、ＬＰＧ、アンモニア、ＣＯ２などが適用可能である。また、液化ガス燃料がＬＮＧの場合、カーゴタンク９に貯留されて運搬対象となる液化ガスは、ＬＮＧであってもよい。 When the liquefied gas fuel is LNG, LPG, ammonia, CO 2 and the like can be applied to the liquefied gas stored in the cargo tank 9 and to be transported, in addition to ethane. When the liquefied gas fuel is LNG, the liquefied gas stored in the cargo tank 9 and to be transported may be LNG.

以下、液化ガス運搬用液化ガス燃料船の他の例について説明する。図２および図３は、本実施形態に係る液化ガス運搬用液化ガス燃料船の他の例の概略図である。なお、液化ガス運搬用液化ガス燃料船の他の例において、上述した液化ガス運搬用液化ガス燃料船と同等部分には同一の符号を付して説明を省略する。 Hereinafter, another example of a liquefied gas fuel ship for transporting liquefied gas will be described. 2 and 3 are schematic views of another example of a liquefied gas fuel ship for transporting liquefied gas according to the present embodiment. In another example of the liquefied gas fuel ship for transporting liquefied gas, the same reference numerals are given to the same parts as those of the liquefied gas fuel ship for transporting liquefied gas described above, and the description thereof will be omitted.

図２に示す液化ガス運搬用液化ガス燃料船の他の例では、図１に示す液化ガス運搬用液化ガス燃料船と比較して、燃料再液化装置７が１段（単一）の冷却装置７Ｂで構成される。このような構成の場合、１段の冷却装置７Ｂにより液化ガス燃料の燃料ボイルオフガスを冷却しなければならず、図１に示す多段の冷却装置７Ａ，７Ｂと比較して冷却効率が低下する傾向となる。そこで、図２に示す液化ガス運搬用液化ガス燃料船の他の例では、液化ガスボイルオフガス熱交換器７Ｂｇの位置を図１に対して燃料再液化再生熱交換器７Ｂｃと交換する。このように構成することで、液化ガスボイルオフガス熱交換器７Ｂｇは、冷媒循環ライン７Ｂａにおいて、冷却部７Ｂｅで燃料ボイルオフガスを冷却し冷熱を奪われた後の低温冷媒を、カーゴタンク９で発生する液化ガスのボイルオフガスの冷熱と熱交換して冷却させる。即ち、燃料再液化再生熱交換器７Ｂｃで冷却する前の温度の高い冷媒を、カーゴタンク９で発生する液化ガスのボイルオフガスの冷熱と熱交換して冷却させるため、図１に示す多段の冷却装置７Ａ，７Ｂと比較して冷却効率が低下する事態を抑えることができる。 In another example of the liquefied gas fuel ship for transporting liquefied gas shown in FIG. 2, the fuel reliquefaction device 7 is a one-stage (single) cooling device as compared with the liquefied gas fuel ship for transporting liquefied gas shown in FIG. It is composed of 7B. In such a configuration, the fuel boil-off gas of the liquefied gas fuel must be cooled by the one-stage cooling device 7B, and the cooling efficiency tends to be lower than that of the multi-stage cooling devices 7A and 7B shown in FIG. It becomes. Therefore, in another example of the liquefied gas fuel ship for transporting liquefied gas shown in FIG. 2, the position of the liquefied gas boil-off gas heat exchanger 7Bg is exchanged with the fuel reliquefaction regenerative heat exchanger 7Bc with respect to FIG. With this configuration, the liquefied gas boil-off gas heat exchanger 7Bg generates a low-temperature refrigerant in the cargo tank 9 after the fuel boil-off gas is cooled by the cooling unit 7Be and the cold heat is taken away in the refrigerant circulation line 7Ba. The liquefied gas is cooled by exchanging heat with the cold heat of the boil-off gas. That is, in order to cool the high temperature refrigerant before cooling by the fuel reliquefaction regenerative heat exchanger 7Bc by exchanging heat with the cold heat of the boil-off gas of the liquefied gas generated in the cargo tank 9, the multi-stage cooling shown in FIG. 1 is performed. It is possible to suppress a situation in which the cooling efficiency is lowered as compared with the devices 7A and 7B.

図３に示す液化ガス運搬用液化ガス燃料船の他の例では、図１に示す液化ガス運搬用液化ガス燃料船と比較して、ボイルオフガス供給部１１がボイルオフガス膨張弁１１Ｄを含まず、ボイルオフガス凝縮器１１Ｃで凝縮されたボイルオフガスは、燃料供給部５における気化装置５Ｃを経由し、エンジン３に供給される。即ち、カーゴタンク９に貯留される液化ガスは、液化ガス燃料と同じＬＮＧである。このような場合、気化装置５Ｃにおいて液化ガスのボイルオフガスを気化装置５Ｃにおける気化用冷媒として供して、ボイルオフガスを液化ガス燃料の冷熱により冷却させても、沸点が低いためボイルオフガスを再液化するほどの冷却は望めず、そのまま燃料として用いることほうが効率が良い。なお、図３に示す液化ガス運搬用液化ガス燃料船の他の例は、図２に示す液化ガス運搬用液化ガス燃料船の他の例においても、適用することが可能である。 In another example of the liquefied gas fuel ship for transporting liquefied gas shown in FIG. 3, the boil-off gas supply unit 11 does not include the boil-off gas expansion valve 11D as compared with the liquefied gas fuel ship for transporting liquefied gas shown in FIG. The boil-off gas condensed by the boil-off gas condenser 11C is supplied to the engine 3 via the vaporizer 5C in the fuel supply unit 5. That is, the liquefied gas stored in the cargo tank 9 is the same LNG as the liquefied gas fuel. In such a case, even if the boil-off gas of the liquefied gas is used as a refrigerant for vaporization in the vaporizer 5C and the boil-off gas is cooled by the cold heat of the liquefied gas fuel, the boil-off gas is reliquefied because the boiling point is low. Not as much cooling can be expected, and it is more efficient to use it as fuel as it is. The other example of the liquefied gas fuel ship for transporting liquefied gas shown in FIG. 3 can also be applied to the other example of the liquefied gas fuel ship for transporting liquefied gas shown in FIG.

１ 燃料タンク
３ エンジン
５ 燃料供給部
５Ａ 燃料供給ライン
５Ｂ 燃料供給ポンプ
５Ｃ 気化装置
７ 燃料再液化装置
７Ａ 冷却装置
７Ａａ 冷媒循環ライン
７Ａｂ 燃料再液化圧縮機
７Ａｃ 燃料再液化再生熱交換器
７Ａｄ 燃料再液化膨張機
７Ａｅ 冷却部
７Ａｆ 駆動部
７Ｂ 冷却装置
７Ｂａ 冷媒循環ライン
７Ｂｂ 燃料再液化圧縮機
７Ｂｃ 燃料再液化再生熱交換器
７Ｂｄ 燃料再液化膨張機
７Ｂｅ 冷却部
７Ｂｆ 駆動部
７Ｂｇ 液化ガスボイルオフガス熱交換器
７Ｃ 燃料ボイルオフガス循環ライン
７Ｃａ 送風機
９ カーゴタンク
１１ ボイルオフガス供給部
１１Ａ ボイルオフガス循環ライン
１１Ｂ ボイルオフガス圧縮機
１１Ｃ ボイルオフガス凝縮器
１１Ｄ ボイルオフガス膨張弁 1 Fuel tank 3 Engine 5 Fuel supply unit 5A Fuel supply line 5B Fuel supply pump 5C Vaporizer 7 Fuel reliquefaction device 7A Cooling device 7Aa Refrigerator circulation line 7Ab Fuel reliquefaction compressor 7Ac Fuel reliquefaction regenerative heat exchanger 7Ad Fuel reliquefaction Expander 7Ae Cooler 7Af Drive 7B Cooler 7B Coolant circulation line 7Bb Fuel reliquefaction compressor 7Bc Fuel reliquefaction regenerative heat exchanger 7Bd Fuel reliquefaction expander 7Be Cooler 7Bf Drive 7Bg Liquefied gas boil-off gas Fuel boil-off gas circulation line 7Ca blower 9 Cargo tank 11 Boil-off gas supply part 11A Boil-off gas circulation line 11B Boil-off gas compressor 11C Boil-off gas condenser 11D Boil-off gas expansion valve

Claims (4)

液化ガス燃料を燃料として液化ガスを運搬する液化ガス運搬用液化ガス燃料船であって、
前記液化ガス燃料を貯留する燃料タンクと、
運搬する前記液化ガスを貯留するカーゴタンクと、
前記燃料タンクに貯留された前記液化ガス燃料から発生する燃料ボイルオフガスを再液化するように、前記カーゴタンクで発生する液化ガスのボイルオフガスの冷熱により前記燃料ボイルオフガスを冷却する液化ガスボイルオフガス熱交換器を備える燃料再液化装置と、
を含む液化ガス運搬用液化ガス燃料船であって、
前記液化ガスボイルオフガス熱交換器を経た前記ボイルオフガスを圧縮するボイルオフガス圧縮機と、
前記ボイルオフガス圧縮機で圧縮された前記ボイルオフガスを凝縮させるボイルオフガス凝縮器と、
前記ボイルオフガス凝縮器で凝縮された前記ボイルオフガスを膨張させるボイルオフガス膨張弁と、
前記燃料タンクの前記液化ガス燃料をエンジンに供給する燃料供給ラインに設けられて前記ボイルオフガス凝縮器で凝縮された前記ボイルオフガスとの熱交換により前記液化ガス燃料を気化させる一方で前記ボイルオフガスを冷却する気化装置と、
を含み、前記ボイルオフガスを再液化して前記カーゴタンクに戻す、液化ガス運搬用液化ガス燃料船。 A liquefied gas fuel ship for transporting liquefied gas that transports liquefied gas using liquefied gas fuel as fuel.
A fuel tank for storing the liquefied gas fuel and
A cargo tank that stores the liquefied gas to be transported and
Liquefied gas boil-off gas heat that cools the fuel boil-off gas by the cold heat of the boil-off gas of the liquefied gas generated in the cargo tank so as to reliquefy the fuel boil-off gas generated from the liquefied gas fuel stored in the fuel tank. A fuel reliquefaction device equipped with a exchanger and
A liquefied gas fuel ship for transporting liquefied gas, including
A boil-off gas compressor that compresses the boil-off gas that has passed through the liquefied gas boil-off gas heat exchanger, and a boil-off gas compressor.
A boil-off gas condenser that condenses the boil-off gas compressed by the boil-off gas compressor, and a boil-off gas condenser.
A boil-off gas expansion valve that expands the boil-off gas condensed by the boil-off gas condenser, and a boil-off gas expansion valve.
The liquefied gas fuel is vaporized by heat exchange with the boil-off gas condensed in the boil-off gas condenser provided in the fuel supply line for supplying the liquefied gas fuel to the engine in the fuel tank, while the boil-off gas is produced. A vaporizer to cool and
A liquefied gas fuel ship for transporting liquefied gas, which reliquefies the boil-off gas and returns it to the cargo tank. 前記燃料再液化装置は、前記燃料タンクで発生する前記燃料ボイルオフガスを多段で順次冷却する複数段の冷却装置を含み、前記液化ガスボイルオフガス熱交換器は、最終段の前記冷却装置に設けられる請求項１に記載の液化ガス運搬用液化ガス燃料船。 The fuel reliquefaction device includes a multi-stage cooling device that sequentially cools the fuel boil-off gas generated in the fuel tank in multiple stages, and the liquefied gas boil-off gas heat exchanger is provided in the final stage cooling device. The liquefied gas fuel ship for transporting liquefied gas according to claim 1. 前記液化ガス燃料は、沸点が前記液化ガス以下である請求項１または２に記載の液化ガス運搬用液化ガス燃料船。 The liquefied gas fuel ship for transporting liquefied gas according to claim 1 or 2 , wherein the liquefied gas fuel has a boiling point equal to or lower than that of the liquefied gas. 前記液化ガス燃料はＬＮＧであり、前記液化ガスはエタンである請求項１〜３のいずれか１つに記載の液化ガス運搬用液化ガス燃料船。 The liquefied gas fuel ship for transporting liquefied gas according to any one of claims 1 to 3 , wherein the liquefied gas fuel is LNG and the liquefied gas is ethane.
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