Gas supply system of LNG (Liquefied Natural Gas) dual-fuel powered ship

Abstract

The invention provides a fuel gas supply system of an LNG dual-fuel power-driven ship. The gas supply system of the LNG dual-fuel power-driven ship comprises an LNG fuel supply system and a gas supply system, wherein the LNG fuel supply system is composed of a fuel storage cabin, a fuel filling system and a gas supply system; the fuel storage cabin is used for storing LNG liquid fuel, and the pressure of the fuel storage cabin is matched with the pressure of the engine; the fuel filling system is composed of a filling station, a liquid injection header pipe and a steam recovery pipe. The filling station is a connecting facility of the LNG storage device and the fuel storage cabin, and the liquid injection header pipe is used for a main way for liquid LNG to enter the storage tank. The LNG dual-fuel power-driven ship fuel gas supply system has the advantages that BOG can be fully utilized, emission of a large amount of boil-off gas can be avoided, and therefore economic losses and environmental pollution are reduced.

Description

technical field [0001] The invention belongs to the technical field of marine gas supply systems, and in particular relates to a gas supply system for LNG dual-fuel powered ships. Background technique [0002] In recent years, with the increasingly serious air pollution, the global control of gas emissions from ships has become increasingly serious. Therefore, the use of natural gas as fuel for ships is the most direct and effective measure to save energy and reduce emissions and improve transportation efficiency. In the related art, a high-pressure / low-pressure gas supply system for a ship's power plant is disclosed, including a high-pressure gas supply system and a low-pressure gas supply system. Gas supply system; the high-pressure gas supply system adopts the transfer spray pump arranged inside or outside the liquid storage tank to communicate with the daily tank, booster pump, high-pressure gasification heater, high-pressure gas valve unit and high-pressure gas fuel mac...

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Problems solved by technology

[0003] However, there are deficiencies in the above structure, because LNG is easy to gasify at room temperature, even in LNG with better thermal insulation performance, a large amount of boil-off gas will inevitably occur due to factors such as collisions, thereby forming low-temperature boil-off gas. The BOG is not used and stored in the fuel tank. As the vapor volume and temperature change, the pressure on the storage device and pipeline will increase accordingly. When the pressure increases to a certain level, it will trigger the safe release of the storage system. device, which in turn will cause a large amount of vapor emissions, resulting in fuel economy losses and air pollution

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