Boil-off gas treatment system and ship

A technology for evaporating gas and processing systems, which is applied in the direction of fluid processing, gas processing/storage purposes, gas processing/storage effects, etc., and can solve problems such as incombustibility

Pending Publication Date: 2021-10-01
MITSUBISHI HEAVY IND LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, depending on the composition of the evaporated gas in the separated gas phase and the operating state of the internal combustion engine for the main engine, it may not be possible to properly combust the evaporated gas in the separated gas phase in the internal combustion engine for the main engine.

Method used

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  • Boil-off gas treatment system and ship
  • Boil-off gas treatment system and ship

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Embodiment Construction

[0034] Hereinafter, an embodiment of the boil-off gas processing system and the ship according to the present invention will be described with reference to the drawings.

[0035] The boil-off gas treatment system 4 according to this embodiment is suitable for the ship 1 that transports LNG (liquefied natural gas, Liquefied Natural Gas). In addition, the objects transported by the ship 1 are not limited to LNG, for example, other liquefied gases such as LPG (Liquefied Petroleum Gas) may also be used.

[0036] The ship 1 is equipped with: an engine for the main engine (internal combustion engine for the main engine) 2, a tank 3 for storing LNG (liquefied gas), a boil-off gas treatment system 4 for processing the boil-off gas generated in the tank 3, and a power generator for generating electricity for use in the ship. A diesel engine 5, and an economizer 6 for generating steam by utilizing the heat of exhaust gas discharged from the diesel engine 5 for power generation.

[0037...

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Abstract

A boil-off gas treatment system (4) is provided with: a boiler (15) that is capable of burning boil-off gas produced in a tank (3) storing LNG and generates steam; a re-liquefaction device (13) for performing liquefaction of the boil-off gas produced in the tank (3); a gas-liquid separator (14) for separating the boil-off gas in a gas-liquid mixed state after the liquefaction in the re-liquefaction device (13) into a gaseous phase and a liquid phase; a flow path for guiding the gaseous-phase boil-off gas separated by the gas-liquid separator (14) to a main engine (2); a flow path for guiding the gaseous phase boil-off gas separated by the gas-liquid separator (14) to the boiler (15); and a first valve (19a), a second valve (33a) and a third valve (36a) for switching the guiding of the gaseous-phase boil-off gas separated by the gas-liquid separator (14) to the main engine (2) or the boiler (15).

Description

technical field [0001] The invention relates to an evaporation gas treatment system and a ship. Background technique [0002] In ships transporting liquefied gas such as LNG (liquefied natural gas, Liquefied Natural Gas) and LPG (liquefied petroleum gas, Liquefied Petroleum Gas), the liquefied gas evaporates in the tank storing the liquefied gas to produce boil-off gas. When boil-off gas is generated inside the tank, the pressure inside the tank may increase to exceed a predetermined pressure. For this reason, a ship transporting liquefied gas is provided with a reliquefaction device that performs a reliquefaction process on the boil-off gas taken out of the tank. The boil-off gas subjected to the liquefaction treatment by the reliquefaction device may not be completely liquefied and may be in a gas-liquid mixed state. For this reason, the boil-off gas in the gas-liquid mixed state after the liquefaction treatment is sometimes subjected to a gas-liquid separation process t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B25/16F17C13/00
CPCF25J1/0037F25J1/0025F25J1/004F25J1/0288F25J1/0202F25J1/023F25J1/0277B63J2099/003F17C9/04F17C2221/033F17C2221/035F17C2223/0161F17C2223/0153F17C2223/033F17C2250/0456F17C2250/0452F17C2250/0652F17C2260/046F17C2265/066F17C2270/0105F17C2265/034F17C2265/037Y02T70/50Y02T10/30B63B25/16B63H21/38F17C9/02F02M21/0209F02M25/08F17C2265/06F17C2265/031F17C2221/032Y02T70/5218
Inventor 中村龙太斋藤英司寺原贵澄松下浩市
Owner MITSUBISHI HEAVY IND LTD
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