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JP2017172603A - Boil-off gas treatment system and liquefied gas carrying vessel - Google Patents

Boil-off gas treatment system and liquefied gas carrying vessel Download PDF

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JP2017172603A
JP2017172603A JP2016055948A JP2016055948A JP2017172603A JP 2017172603 A JP2017172603 A JP 2017172603A JP 2016055948 A JP2016055948 A JP 2016055948A JP 2016055948 A JP2016055948 A JP 2016055948A JP 2017172603 A JP2017172603 A JP 2017172603A
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gas
pressure
boil
liquefied
compressor
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JP6677367B2 (en
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伸哉 湯浅
Shinya Yuasa
伸哉 湯浅
貴士 渡邉
Takashi Watanabe
貴士 渡邉
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Mitsui Engineering and Shipbuilding Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/14—Use of propulsion power plant or units on vessels the vessels being motor-driven relating to internal-combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; Cooling
    • B63J2/14—Heating; Cooling of liquid-freight-carrying tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J3/00—Driving of auxiliaries
    • B63J3/04—Driving of auxiliaries from power plant other than propulsion power plant
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

PROBLEM TO BE SOLVED: To secure redundancy for boil-off gas treatment at low cost in a multiple gas carrying vessel.SOLUTION: Provided are two high-pressure gas compressors 17 configured to compress boil-off gas BOG occurring inside a cargo tank 13 for storing liquefied gas. Provided are two LPG re-liquefaction systems 20 configured to liquefy propane gas having been compressed to pressure LP2 by the high-pressure gas compressor 17. Provided is a natural gas/ethane gas re-liquefaction system 23 configured to liquefy natural gas or ethane gas having been compressed to pressure MP higher than the pressure LP2 by the high-pressure compressor 17.SELECTED DRAWING: Figure 1

Description

本発明は、液化ガスが荷載されるカーゴタンクで発生するボイルオフガス（ＢＯＧ）を処理するシステムに関する。   The present invention relates to a system for processing boil-off gas (BOG) generated in a cargo tank loaded with liquefied gas.

液化天然ガス運搬船（ＬＮＧタンカー）には、カーゴタンクで発生するボイルオフガス（ＢＯＧ）を船内の推進機関、発電機関や蒸気ボイラの燃料に利用するものがある。しかし、ボイルオフガスの全てを燃料として消費できない船速域もあるため、そのような場合余剰ボイルオフガスは、コンプレッサと冷媒を用いた再液化装置（特許文献１、２）で再液化してカーゴタンクへ回収するか、ガス燃焼装置やガス焚きボイラなどで焼却処理される。一方、液化エタン運搬船もしくは液化プロパンガス運搬船（ＬＰＧタンカー）では、ボイルオフガスの燃料として利用及び燃焼処理は基本的に認められていないため、ボイルオフガスは全て再液化装置で液化する必要がある（特許文献３）。またエタンやプロパンを燃料として使用する場合、主管庁の承認を得る必要がある。ＬＮＧ、エタンを燃料として使用する場合、ガスの状態でガス焚き可能なエンジン、ボイラもしくはガス焼却炉に供給される。一方でＬＰＧを燃料として利用する場合、液体もしくはガスとなり、ＬＮＧ／エタンとＬＰＧでは燃料として利用する際の形態が大きく異なる。   Some liquefied natural gas carriers (LNG tankers) use boil-off gas (BOG) generated in cargo tanks as fuel for propulsion engines, power generation engines, and steam boilers. However, since there are ship speed ranges where all of the boil-off gas cannot be consumed as fuel, the surplus boil-off gas is re-liquefied by a re-liquefaction device (Patent Documents 1 and 2) using a compressor and a refrigerant in such a case. Or incinerated with a gas combustion device or a gas fired boiler. On the other hand, in a liquefied ethane carrier or a liquefied propane gas carrier (LPG tanker), utilization and combustion treatment of boil-off gas is basically not permitted, and therefore all boil-off gas must be liquefied by a reliquefaction device (patent) Reference 3). Also, when using ethane or propane as fuel, it is necessary to obtain approval from the Administration. When LNG or ethane is used as fuel, it is supplied to an engine, boiler or gas incinerator that can be gas-fired in a gas state. On the other hand, when LPG is used as fuel, it becomes a liquid or gas, and the form when using it as fuel differs greatly between LNG / ethane and LPG.

特開２００１−１３２８９９号公報JP 2001-132899 A 特開２００５−２６５１７０号公報JP 2005-265170 A 特開平９−２２１０９８号公報Japanese Patent Laid-Open No. 9-2221098

ところで、近年では、液化エタン、ＬＰＧ、ＬＮＧなど複数の液化ガスを運搬可能なマルチガス運搬船への要請がある。一方、船舶では、システムに問題が発生した場合に備えて冗長性を確保する必要があり、ボイルオフガス処理システムにおいても冗長性の確保が必須である。ＬＮＧタンカーでは、燃料としてボイルオフガスを利用することが可能なため、再液化装置が１台であっても、ガス焚き可能なボイラもしくはガス焼却炉を装備すれば、ボイルオフガスの処理装置の冗長性は確保できる。また、主管庁からエタンを燃料として使用することの許可が得られれば、液化エタンガスについてもＬＮＧと同様である。一方、前述したようにＬＰＧタンカーでは、原則、全てのボイルオフガスを再液化する必要があるため、ＬＰＧとＬＮＧの運搬を兼務できるタンカーでは、ＬＰＧ運搬時における冗長性確保のために再液化装置を２台設ける必要が生じる。しかし、ＬＮＧの再液化にも利用できる再液化装置は高価であり、その運用コストも高い。   By the way, in recent years, there is a demand for a multi-gas transport ship capable of transporting a plurality of liquefied gases such as liquefied ethane, LPG, and LNG. On the other hand, in a ship, it is necessary to ensure redundancy in case a problem occurs in the system, and it is essential to ensure redundancy in a boil-off gas processing system. Since LNG tankers can use boil-off gas as fuel, even if there is only one reliquefaction device, if equipped with a gas-fired boiler or gas incinerator, the redundancy of the boil-off gas processing device Can be secured. In addition, if permission from the Administration to use ethane as fuel is obtained, liquefied ethane gas is the same as LNG. On the other hand, as described above, in an LPG tanker, in principle, it is necessary to reliquefy all the boil-off gas. Therefore, in a tanker capable of carrying both LPG and LNG, a reliquefaction device is used to ensure redundancy during LPG transportation. Two units need to be provided. However, a reliquefaction apparatus that can be used for reliquefaction of LNG is expensive and its operation cost is high.

本発明は、マルチガス運搬船において低コストでボイルオフガス処理のための冗長性を確保することを目的としている。   An object of the present invention is to ensure redundancy for boil-off gas processing at a low cost in a multi-gas carrier.

本発明の液化ガスのボイルオフガス処理システムは、液化ガスを貯蔵するタンク内で発生するボイルオフガスを圧縮する２台の高圧ガスコンプレッサと、高圧ガスコンプレッサで第１圧力にまで圧縮された第１ガスを液化するための２台の第１液化システムと、高圧ガスコンプレッサで第１圧力よりも高い第２圧力にまで圧縮された第２ガスを液化するための１台の第２液化システムとを備えることを特徴としている。   The boil-off gas processing system for liquefied gas according to the present invention includes two high-pressure gas compressors that compress boil-off gas generated in a tank that stores liquefied gas, and a first gas that is compressed to a first pressure by the high-pressure gas compressor. Two first liquefaction systems for liquefying the gas and one second liquefaction system for liquefying the second gas compressed to a second pressure higher than the first pressure by the high-pressure gas compressor. It is characterized by that.

高圧ガスコンプレッサは、第２ガスを第２圧力よりも高い第３圧力にまで圧縮してガス焚き可能な２元燃料焚き低速ディーゼル機関へ供給可能である。タンク内で発生するボイルオフガスが第１ガスのとき、ボイルオフガスは全て高圧ガスコンプレッサで第１圧力にまで圧縮された後、第１液化システムにより液化されタンクに戻される。   The high-pressure gas compressor can supply the second gas to a dual fuel-fired low-speed diesel engine capable of gas burning by compressing the second gas to a third pressure higher than the second pressure. When the boil-off gas generated in the tank is the first gas, all the boil-off gas is compressed to the first pressure by the high-pressure gas compressor and then liquefied by the first liquefaction system and returned to the tank.

第２液化システムは、タンク内で発生した第２ガスのボイルオフガスと第２圧力にまで圧縮された第２ガスとの間で熱交換を行う熱交換器と、熱交換器で冷却された第２圧力にまで圧縮された第２ガスを液化する第２ガス液化装置とを備える。高圧ガスコンプレッサは、第２ガスを第２圧力よりも低い圧力にまで圧縮してガス焚き可能な２元燃料焚きボイラもしくはガス焼却炉へ供給可能である。高圧ガスコンプレッサは、第２ガスを第２圧力よりも低い圧力にまで圧縮してガス焚き可能な発電機エンジンへ供給可能である。２台の高圧ガスコンプレッサと２台の第１液化システムにおいて、各１台が予備の高圧ガスコンプレッサおよび予備の第１液化システムとして用いられる。また、タンク内の液化ガスを強制気化させて第２ガスを発生させる強制気化器を備えてもよい。第１ガスには、例えば液化プロパンガスが含まれ、第２ガスには例えば液化天然ガスまたは液化エタンガスが含まれる。   The second liquefaction system includes a heat exchanger for exchanging heat between the boil-off gas of the second gas generated in the tank and the second gas compressed to the second pressure, and the second liquefaction system cooled by the heat exchanger. A second gas liquefying device for liquefying the second gas compressed to 2 pressures. The high-pressure gas compressor can supply the second gas to a dual fuel-fired boiler or a gas incinerator that can compress and gas the second gas to a pressure lower than the second pressure. The high-pressure gas compressor can supply the second gas to a generator engine capable of gas burning by compressing the second gas to a pressure lower than the second pressure. In the two high-pressure gas compressors and the two first liquefaction systems, one each is used as a spare high-pressure gas compressor and a spare first liquefaction system. Moreover, you may provide the forced vaporizer which forcedly vaporizes the liquefied gas in a tank and generate | occur | produces 2nd gas. The first gas includes, for example, liquefied propane gas, and the second gas includes, for example, liquefied natural gas or liquefied ethane gas.

本発明の液化ガス運搬船は、上記ボイルオフ処理システムを備えたことを特徴としている。   The liquefied gas carrier of the present invention is characterized by including the boil-off processing system.

本発明によれば、マルチガス運搬船において低コストでボイルオフガス処理のための冗長性を確保することができる。   According to the present invention, redundancy for boil-off gas processing can be ensured at low cost in a multi-gas carrier.

本発明の一実施形態であるボイルオフガス処理システムの構成を示すブロック図である。It is a block diagram which shows the structure of the boil off gas processing system which is one Embodiment of this invention.

以下、本発明の実施形態について添付図面を参照して説明する。
図１は、本発明の一実施形態であるボイルオフガス処理システムの構成を示すブロック図である。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a block diagram showing a configuration of a boil-off gas processing system according to an embodiment of the present invention.

本実施形態のボイルオフガス処理システム１０は、液化天然ガス（ＬＮＧ）、液化エタンガス（ＬＥＧ）、液化プロパンガス（ＬＰＧ）などの液化ガスを運搬可能なマルチガス運搬船Ｓに適用される。本実施形態のマルチガス運搬船Ｓは、例えば主機関１１に２元燃料焚き低速ディーゼル（直結）推進を利用した液化ガス運搬船である。主機関１１には、燃料油タンク１２から燃料油を供給可能であるとともに、後述するようにボイルオフガス処理システム１０から高圧（ＨＰ）の天然ガスまたはエタンガスを機関燃料ガスとして供給可能である。   The boil-off gas processing system 10 of this embodiment is applied to a multi-gas carrier S capable of transporting liquefied gas such as liquefied natural gas (LNG), liquefied ethane gas (LEG), and liquefied propane gas (LPG). The multi-gas carrier S of the present embodiment is a liquefied gas carrier using, for example, a dual fuel-fired low-speed diesel (direct connection) propulsion for the main engine 11. Fuel oil can be supplied to the main engine 11 from the fuel oil tank 12, and high-pressure (HP) natural gas or ethane gas can be supplied as engine fuel gas from the boil-off gas processing system 10 as will be described later.

船体内に設けられたカーゴタンク１３には、例えば液化天然ガス（ＬＮＧ）、液化エタンガス（ＬＥＧ）、液化プロパンガス（ＬＰＧ）などの液化ガスの何れかが貯蔵される。カーゴタンク１３内で自然発生し、タンク上方に溜まったボイルオフガス（ＢＯＧ）は、ボイルオフガス配管１４を通して熱交換器１５、あるいは熱交換器１５を迂回するバイパス管１６を介して高圧ガスコンプレッサ１７へと送られる。なお、熱交換器１５を通すかバイパス管１６を通すかは、バイパス管１６に設けられたバルブ１６Ｖ及び熱交換器１５の入口バルブ１５Ｖの開閉により制御される。   The cargo tank 13 provided in the hull stores one of liquefied gases such as liquefied natural gas (LNG), liquefied ethane gas (LEG), and liquefied propane gas (LPG). Boil-off gas (BOG) naturally generated in the cargo tank 13 and accumulated above the tank passes through the boil-off gas pipe 14 to the high-pressure gas compressor 17 via the heat exchanger 15 or the bypass pipe 16 that bypasses the heat exchanger 15. Sent. Whether to pass the heat exchanger 15 or the bypass pipe 16 is controlled by opening and closing a valve 16V provided in the bypass pipe 16 and an inlet valve 15V of the heat exchanger 15.

高圧ガスコンプレッサ１７は、例えば５〜６段の多段コンプレッサである。高圧ガスコンプレッサ１７に供給されたガスは、高圧ガスコンプレッサ１７の１〜２段目あるいは１〜３段目を用いて圧力ＬＰ２にまで圧縮される。圧力ＬＰ２のガスは、第１ガス再液化装置ガス配管１８１を通して例えばＬＰＧコンデンサ１９を備えるＬＰＧ再液化システム（第１液化システム）２０に送られる。   The high-pressure gas compressor 17 is a multistage compressor having, for example, 5 to 6 stages. The gas supplied to the high pressure gas compressor 17 is compressed to the pressure LP2 using the first or second stage or the first to third stages of the high pressure gas compressor 17. The gas having the pressure LP2 is sent to the LPG reliquefaction system (first liquefaction system) 20 including the LPG condenser 19 through the first gas reliquefaction apparatus gas pipe 181, for example.

ＬＰＧコンデンサ１９は、カーゴタンク１３にＬＰＧガスが貯蔵される際に使用され、このときにはＬＰＧのボイルオフガスは、バイパス管１６、高圧ガスコンプレッサ１７、第１ガス再液化装置ガス配管１８１を通して、ＬＰＧコンデンサ１９に送られ、海水や清水により冷却されて液化する。液化されたプロパンガスは、液化ガス回収管２１を通してカーゴタンク１３へと回収される。なお、プロパンガス液化時の必要圧力はエタンの含有量によって異なるため（約１５ｂａｒ〜３０ｂａｒ）、エタン含有量によって、高圧ガスコンプレッサ１７の１、２段の使用か、１〜３段の使用かが選択される。また、ＬＰＧ運搬時には、高圧ガスコンプレッサ１７の３段以上または４段以上の高圧段は運転されず、主機燃料としては燃料油タンク１２からの燃料が使用される。   The LPG condenser 19 is used when the LPG gas is stored in the cargo tank 13, and at this time, the LPG boil-off gas passes through the bypass pipe 16, the high-pressure gas compressor 17, and the first gas reliquefaction apparatus gas pipe 181. 19 is cooled by seawater or fresh water and liquefied. The liquefied propane gas is recovered into the cargo tank 13 through the liquefied gas recovery pipe 21. In addition, since the required pressure at the time of propane gas liquefaction varies depending on the ethane content (about 15 bar to 30 bar), depending on the ethane content, whether the high pressure gas compressor 17 is used in one or two stages or one to three stages Selected. In addition, when the LPG is transported, three or more high pressure stages or four or more high pressure stages of the high pressure gas compressor 17 are not operated, and the fuel from the fuel oil tank 12 is used as the main engine fuel.

また、高圧ガスコンプレッサ１７の中段からは、圧力ＭＰ（＞ＬＰ２）で天然ガスまたはエタンガスの圧縮ガスが吐出され、第２ガス再液化装置ガス配管１８２を通して天然ガス／エタンガス再液化システム（第２液化システム）２３に送られる。天然ガス／エタンガス再液化システム２３は、熱交換器１５とその下流に配置される再液化装置２２から構成され、この経路はカーゴタンク１３にＬＮＧまたはＬＥＧが貯蔵される際に選択される。このとき、高圧ガスコンプレッサ１７により圧力ＭＰまで圧縮された天然ガス／エタンガスは、ボイルオフガス配管１４を通してカーゴタンク１３から高圧ガスコンプレッサ１７の入口に供給される低温のボイルオフガスと熱交換を行い冷却され、再液化装置２２において液化される。   Further, a compressed gas of natural gas or ethane gas is discharged from the middle stage of the high pressure gas compressor 17 at a pressure MP (> LP2), and the natural gas / ethane gas reliquefaction system (second liquefaction system) is passed through the second gas reliquefaction device gas pipe 182. System) 23. The natural gas / ethane gas reliquefaction system 23 includes a heat exchanger 15 and a reliquefaction device 22 disposed downstream thereof, and this route is selected when LNG or LEG is stored in the cargo tank 13. At this time, the natural gas / ethane gas compressed to the pressure MP by the high-pressure gas compressor 17 is cooled by exchanging heat with the low-temperature boil-off gas supplied from the cargo tank 13 to the inlet of the high-pressure gas compressor 17 through the boil-off gas pipe 14. Then, it is liquefied in the reliquefaction device 22.

再液化装置２２は、図示しない冷媒サイクルやジュールトムソンバルブなどを備え、これらを利用して供給された天然ガス／エタンガスを冷却して液化する。液化されたＬＮＧ／ＬＥＧは、液化ガス回収管２１を通してカーゴタンク１３へと回収される。なお、カーゴタンク１３にＬＰＧを貯蔵する際には、再液化装置２２は使用されない。   The reliquefaction device 22 includes a refrigerant cycle, a Joule-Thomson valve, and the like (not shown), and cools and liquefies the natural gas / ethane gas supplied using these. The liquefied LNG / LEG is recovered to the cargo tank 13 through the liquefied gas recovery pipe 21. When storing LPG in the cargo tank 13, the reliquefaction device 22 is not used.

カーゴタンク１３にＬＮＧ／ＬＥＧを貯蔵する際には、ＢＯＧの発生量と船舶の運転状態等に合わせた、高圧ガスコンプレッサ１７の高圧段も運転可能であり、その最終段（例えば５段または６段）からは圧力ＨＰ（＞ＭＰ）で天然ガス／エタンガスが吐出される。圧力ＨＰは、主機関１１への燃料ガス供給圧に対応し、必要に応じて天然ガス／エタンガスを主機燃料として燃焼させ、ボイルオフガスを処理する。   When storing LNG / LEG in the cargo tank 13, the high-pressure stage of the high-pressure gas compressor 17 can be operated in accordance with the amount of BOG generated and the operating state of the ship, and the final stage (for example, 5 stages or 6 stages). The natural gas / ethane gas is discharged from the stage) at a pressure HP (> MP). The pressure HP corresponds to the fuel gas supply pressure to the main engine 11, and burns natural gas / ethane gas as the main engine fuel as needed to process the boil-off gas.

また、本実施形態のマルチガス運搬船Ｓは、２元燃料焚きボイラ２４もしくはガス焼却炉等を備え、カーゴタンク１３にＬＮＧ／ＬＥＧが貯蔵される際には必要に応じて、高圧ガスコンプレッサ１７の低圧段（例えば１〜２段）から圧力ＬＰ１（＜ＭＰ）の圧縮ガスを燃料ガスとして供給し、ボイルオフガスを焼却処理することもできる。また２元燃料焚き発電機エンジンを備え、高圧ガスコンプレッサ１７の低圧段から圧力ＭＰより低い圧力の圧縮ガスを発電機エンジンの燃料ガスとして供給してもよい。   The multi-gas carrier S of the present embodiment includes a dual fuel-fired boiler 24, a gas incinerator, or the like. When LNG / LEG is stored in the cargo tank 13, the high-pressure gas compressor 17 A boil-off gas can be incinerated by supplying a compressed gas having a pressure LP1 (<MP) as a fuel gas from a low-pressure stage (for example, 1-2 stages). Further, a dual fuel-fired generator engine may be provided, and a compressed gas having a pressure lower than the pressure MP may be supplied as a fuel gas for the generator engine from the low pressure stage of the high pressure gas compressor 17.

本実施形態のマルチガス運搬船Ｓは、カーゴタンク１３内にスプレーポンプ２５を備え、カーゴタンク１３内の液化ガスを汲み上げ、強制気化器２６において蒸発させることができる。スプレーポンプ２５はスプレー作業時に使用されるが、積荷がＬＮＧ／ＬＥＧの場合、強制気化器２６を通して気化させ、高圧ガスコンプレッサ１７を通して燃料ガスとして気化されたガスを燃料ガスとして利用することもできる。強制気化器２６へ液化ガスを供給するポンプは専用の燃料ガス供給ポンプとしてもよい。なお、図１では強制気化器２６を出た気化ガスは熱交換器１５の上流側でカーゴタンク１３で発生したボイルオフガスと合流させているが、合流点は熱交換器１５の下流側の高圧ガスコンプレッサの吸込み前でもよい。   The multi-gas carrier S of the present embodiment includes a spray pump 25 in the cargo tank 13, and can pump up the liquefied gas in the cargo tank 13 and evaporate it in the forced vaporizer 26. The spray pump 25 is used at the time of spraying, but when the load is LNG / LEG, the gas vaporized through the forced vaporizer 26 and vaporized as the fuel gas through the high-pressure gas compressor 17 can be used as the fuel gas. The pump that supplies the liquefied gas to the forced vaporizer 26 may be a dedicated fuel gas supply pump. In FIG. 1, the vaporized gas exiting the forced vaporizer 26 is merged with the boil-off gas generated in the cargo tank 13 on the upstream side of the heat exchanger 15, but the merge point is a high-pressure on the downstream side of the heat exchanger 15. It may be before the suction of the gas compressor.

なお、本実施形態では、上記構成において、高圧ガスコンプレッサ１７を２台、天然ガス／エタンガス再液化システム２３を１台、ＬＰＧ再液化システム２０を２台備える。すなわち、ＬＮＧ／ＬＥＧを積荷とする場合には、予備も含めた２台の高圧ガスコンプレッサ１７を介したボイルオフガスの燃焼処理と、１台の天然ガス／エタンガス再液化システム２３を利用したボイルオフガスの再液化処理がボイルオフガス処理に関する冗長性を担保し、ＬＰＧを積荷とする場合には、予備も含めた２台の高圧ガスコンプレッサ１７と予備も含めた２台のＬＰＧ再液化システム２０がボイルオフガス処理に関する冗長性を担保する。   In this embodiment, in the above configuration, two high-pressure gas compressors 17, one natural gas / ethane gas reliquefaction system 23, and two LPG reliquefaction systems 20 are provided. That is, when LNG / LEG is used as a cargo, boil-off gas combustion processing via two high-pressure gas compressors 17 including a spare and boil-off gas using one natural gas / ethane gas reliquefaction system 23 are used. If the re-liquefaction process of this guarantees the redundancy related to the boil-off gas process and LPG is loaded, the two high-pressure gas compressors 17 including the spare and the two LPG re-liquefaction systems 20 including the spare are boiled off. Ensures redundancy in gas processing.

以上のように、本実施形態によれば、高価な天然ガス／エタンガス再液化システムを１台しか用いずに、ＬＰＧ、ＬＮＧ、ＬＥＧのボイルオフガス処理に対して冗長性を担保することができる。これによりマルチガス運搬船においてもボイルオフガス処理に関して冗長性を低コストで確保することができる。   As described above, according to this embodiment, it is possible to ensure redundancy for boil-off gas processing of LPG, LNG, and LEG without using only one expensive natural gas / ethane gas reliquefaction system. Thereby, redundancy can be ensured at low cost for boil-off gas processing even in a multi-gas carrier.

また、本実施形態では、ＬＰＧ運搬時には、運転コストの高い天然ガス／エタンガス再液化システムを運転することなくＬＰＧのボイルオフガスを液化することができ、運用コストを低減できる。更に、本実施形態では、多段式高圧ガスコンプレッサの低圧段をＬＰＧ再液化用のコンプレッサとして兼用することで、ＬＰＧ再液化用のコンプレッサを新たに設置する必要がなく、コストおよびスペースを削減できる。   Moreover, in this embodiment, the LPG boil-off gas can be liquefied without operating a natural gas / ethane gas reliquefaction system having a high operation cost during LPG transportation, and the operation cost can be reduced. Furthermore, in the present embodiment, the low-pressure stage of the multistage high-pressure gas compressor is also used as a compressor for LPG reliquefaction, so that it is not necessary to newly install a compressor for LPG reliquefaction, and cost and space can be reduced.

１０ ボイルオフガス処理システム
１１ 主機関
１２ 燃料油タンク
１３ カーゴタンク
１４ ボイルオフガス配管
１５ 熱交換器
１５Ｖ バルブ
１６ バイパス管
１６Ｖ バルブ
１７ 高圧ガスコンプレッサ
１９ ＬＰＧコンデンサ
２０ ＬＰＧ再液化システム（第１液化システム）
２１ 液化ガス回収管
２２ 再液化装置
２３ 天然ガス／エタンガス再液化システム（第２液化システム）
２５ スプレーポンプ
２６ 強制気化器
１８１ 第１ガス再液化装置ガス配管
１８２ 第２ガス再液化装置ガス配管 DESCRIPTION OF SYMBOLS 10 Boil-off gas processing system 11 Main engine 12 Fuel oil tank 13 Cargo tank 14 Boil-off gas piping 15 Heat exchanger 15V Valve 16 Bypass pipe 16V Valve 17 High pressure gas compressor 19 LPG capacitor 20 LPG reliquefaction system (1st liquefaction system)
21 Liquefied gas recovery pipe 22 Reliquefaction device 23 Natural gas / ethane gas reliquefaction system (second liquefaction system)
25 Spray pump 26 Forced vaporizer 181 First gas reliquefier gas pipe 182 Second gas reliquefier gas pipe

Claims (10)

液化ガスを貯蔵するタンク内で発生するボイルオフガスを圧縮する２台の高圧ガスコンプレッサと、
前記高圧ガスコンプレッサで第１圧力にまで圧縮された第１ガスを液化するための２台の第１液化システムと、
前記高圧ガスコンプレッサで前記第１圧力よりも高い第２圧力にまで圧縮された第２ガスを液化するための１台の第２液化システムと
を備えることを特徴とする液化ガスのボイルオフガス処理システム。 Two high-pressure gas compressors for compressing boil-off gas generated in a tank for storing liquefied gas;
Two first liquefaction systems for liquefying the first gas compressed to a first pressure by the high-pressure gas compressor;
A boil-off gas treatment system for liquefied gas, comprising: a second liquefaction system for liquefying the second gas compressed to a second pressure higher than the first pressure by the high-pressure gas compressor. . 前記高圧ガスコンプレッサが、前記第２ガスを前記第２圧力よりも高い第３圧力にまで圧縮してガス焚き可能な２元燃料焚き低速ディーゼル機関へ供給可能であることを特徴とする請求項１に記載のボイルオフガス処理システム。   2. The high-pressure gas compressor can supply the second gas to a dual fuel-fired low-speed diesel engine capable of gas-compressing the second gas to a third pressure higher than the second pressure. The boil-off gas processing system described in 1. 前記タンク内で発生するボイルオフガスが前記第１ガスのとき、前記ボイルオフガスは全て前記高圧ガスコンプレッサで第１圧力にまで圧縮された後、前記第１液化システムにより液化され前記タンクに戻されることを特徴とする請求項１または２の何れかに記載のボイルオフ処理システム。   When the boil-off gas generated in the tank is the first gas, all the boil-off gas is compressed to the first pressure by the high-pressure gas compressor and then liquefied by the first liquefaction system and returned to the tank. The boil-off processing system according to claim 1 or 2, characterized in that. 前記第２液化システムが、前記タンク内で発生した前記第２ガスのボイルオフガスと前記第２圧力にまで圧縮された第２ガスとの間で熱交換を行う熱交換器と、前記熱交換器で冷却された第２圧力にまで圧縮された第２ガスを液化する第２ガス液化装置とを備えることを特徴とする請求項１〜３の何れか一項に記載のボイルオフガス処理システム。   A heat exchanger for exchanging heat between the boil-off gas of the second gas generated in the tank and the second gas compressed to the second pressure; and the heat exchanger. The boil-off gas processing system according to any one of claims 1 to 3, further comprising: a second gas liquefying device that liquefies the second gas compressed to the second pressure cooled in step (4). 前記高圧ガスコンプレッサが、前記第２ガスを前記第２圧力よりも低い圧力にまで圧縮してガス焚き可能なボイラもしくはガス焼却炉へ供給可能であることを特徴とする請求項１〜４の何れか一項に記載のボイルオフガス処理システム。   The high-pressure gas compressor can compress the second gas to a pressure lower than the second pressure and supply it to a gas-fired boiler or a gas incinerator. The boil-off gas processing system according to claim 1. 前記高圧ガスコンプレッサが、前記第２ガスを前記第２圧力よりも低い圧力にまで圧縮してガス焚き可能な発電機エンジンへ供給可能であることを特徴とする請求項１〜５の何れか一項に記載のボイルオフガス処理システム。   6. The high-pressure gas compressor is capable of supplying the generator gas to a generator engine capable of gas burning by compressing the second gas to a pressure lower than the second pressure. The boil-off gas processing system according to item. 前記２台の高圧ガスコンプレッサと前記２台の第１液化システムにおいて、各１台が予備の高圧ガスコンプレッサおよび予備の第１液化システムであることを特徴とする請求項１〜６の何れか一項に記載のボイルオフガス処理システム。   7. The two high-pressure gas compressors and the two first liquefaction systems, wherein one of each is a spare high-pressure gas compressor and a spare first liquefaction system. The boil-off gas processing system according to item. 前記タンク内の液化ガスを強制気化させて第２ガスを発生させる強制気化器を備えることを特徴とする請求項１〜７の何れか一項に記載のボイルオフガス処理システム。   The boil-off gas treatment system according to any one of claims 1 to 7, further comprising a forced vaporizer that forcibly vaporizes the liquefied gas in the tank to generate a second gas. 前記第１ガスに液化プロパンガスが含まれ、前記第２ガスに液化天然ガスまたは液化エタンガスが含まれることを特徴とする請求項１〜８の何れか一項に記載のボイルオフガス処理システム。   The boil-off gas processing system according to any one of claims 1 to 8, wherein the first gas contains liquefied propane gas, and the second gas contains liquefied natural gas or liquefied ethane gas. 請求項１〜９の何れか一項に記載のボイルオフガス処理システムを備えたことを特徴とする液化ガス運搬船。   A liquefied gas carrier ship comprising the boil-off gas treatment system according to any one of claims 1 to 9.
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