Fuel gas supply system and method of an LNG carrier

Abstract

A fuel gas supply system of an LNG carrier is provided for supplying fuel gas to a high-pressure gas injection engine of an LNG carrier, wherein LNG is extracted from an LNG storage tank of the LNG carrier, compressed at a high pressure, gasified, and then supplied to the high-pressure gas injection engine.

Description

BACKGROUND[0001]1. Technical Field[0002]The present invention relates to a fuel gas supply system and method of an LNG carrier, and more particularly, to a fuel gas supply system and method of an LNG carrier for efficiently supplying fuel gas from an LNG storage tank to a high-pressure gas injection engine in the LNG carrier.[0003]2. Description of the Related Art[0004]Generally, natural gas is turned into a liquefied natural gas (hereinafter called “LNG”) at a cryogenic temperature in a liquefaction plant, and then transported over long distances to a destination by an LNG carrier.[0005]As liquefaction of natural gas occurs at a cryogenic temperature of −163 degrees Celsius at ambient pressure, LNG is likely to be vaporized even when the temperature of the LNG is slightly higher than −163 degrees Celsius at ambient pressure. In an LNG carrier having an LNG storage tank which is thermally-insulated, as heat is continually transmitted from the outside to the LNG in the LNG storage ta...

AI Technical Summary

Benefits of technology

[0008]To solve the above-mentioned problems posed by the prior art, the present invention is to provide a fuel gas supply system and method of an LNG carrier which can simplify the configuration, reduce power requirements, and prevent an excessive pressure increase due to accumulation of boil-off gas in an LNG storage tank, in supplying fuel gas to a high-pressure gas injection engine of an LNG carrier.

Problems solved by technology

In an LNG carrier, if boil-off gas is accumulated in an LNG storage tank, the pressure in the LNG storage tank excessively increases.

This multi-stage compression has problems that the fuel gas supply system becomes very complex, and that an excessive amount of power is required to compress the boil-off gas in a gaseous state at a high pressure.

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