LNG gas supply system with double fuel ship engines

Abstract

The invention provides an LNG gas supply system with double fuel ship engines. The system comprises an LNG storing tank, a natural gas daily tank, a low-pressure gasifying device, a low-pressure buffering tank, an auxiliary machine valve set device, a ship auxiliary machine engine, a high-pressure pump system, a high-pressure gasifying device, a high-pressure buffering device, a main machine valveset device, a ship main machine engine, an auxiliary machine W / G circulating system, a main machine W / G circulating system, an immersed pump, an auxiliary machine engine gas collecting box, a first coiler, a first tail gas catalytic device, an auxiliary machine exhausting pipe, a main machine engine gas collecting box, a second coiler, a second tail gas catalytic device, a main machine exhaustingpipe, a first three-way valve and a second three-way valve.

Description

technical field [0001] The invention relates to the technical field of ships, in particular to a dual-fuel ship engine LNG gas supply system. Background technique [0002] Requirements of Annex VI of MARPOL Convention (International Convention for the Prevention of Pollution from Ships) No. 73 / 78: Newly built ships after January 1, 2016 in the ECA area (Ship Emission Control Area) NO X The emissions must meet the TierⅢ standard; for SO X In terms of emissions, after January 1, 2020, ships sailing in any area must have a sulfur content of less than 0.5% m / m (mass / mass, mass percentage); for ships sailing in the ECA area, After January 1, 2015, the sulfur content of fuel must be below 0.1% m / m. [0003] As the International Maritime Organization's requirements for exhaust gas emission indicators become more and more stringent, ships need to be equipped with exhaust gas after-treatment equipment or choose clean fuels. At the same time, LNG (Liquefied Natural Gas, liquefied na...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a dual-fuel ship engine LNG gas supply system and a dual-fuel ship, aiming at solving the deficiencies in the above-mentioned background technology, and providing an additional heating heat source and exhaust gas for the needs of the existing marine LNG gas supply technology. NO in X Unable to meet the third-stage emission standards and methane escape and other issues, through reasonable design on the premise of conforming to scientific principles, the exhaust waste heat of the engine in the air supply system can be reused and the gas emission indicators are better

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