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Boil-off gas treatment apparatus for electric-propelled LNG carrier having re-liquefaction function and method thereof

A technology of evaporated gas and electric propulsion, which is applied in the direction of engines using propulsion device combinations, transportation and packaging, and emission reduction based on propulsion. It can solve problems such as low reliquefaction efficiency, achieve waste reduction, high stable operation, and economical sexual effect

Inactive Publication Date: 2012-02-01
STX OFFSHORE & SHIPBUILDING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a limitation that an additional compressor needs to be provided for the DFDE propulsion engine alone, or the existing reliquefaction plant can only be operated with low reliquefaction efficiency

Method used

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  • Boil-off gas treatment apparatus for electric-propelled LNG carrier having re-liquefaction function and method thereof
  • Boil-off gas treatment apparatus for electric-propelled LNG carrier having re-liquefaction function and method thereof
  • Boil-off gas treatment apparatus for electric-propelled LNG carrier having re-liquefaction function and method thereof

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Embodiment Construction

[0045] The boil-off gas treatment device and method of the electric propulsion LNG carrier with reliquefaction function according to the present invention having the above-mentioned structure will be described in detail below with reference to the accompanying drawings.

[0046] figure 1 It is a schematic diagram showing the first embodiment of the boil-off gas treatment device of the electric propulsion LNG carrier equipped with the reliquefaction function according to the present invention; figure 2 It is a flowchart showing the first embodiment of the boil-off gas treatment method of the boil-off gas treatment device of the electric propulsion LNG carrier equipped with a reliquefaction function according to the present invention.

[0047] According to the boil-off gas processing device of the electric propulsion LNG carrier with reliquefaction function according to the present invention, it relates to a boil-off gas processing device, which converts the natural boil-off ga...

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Abstract

The present invention relates to a boil-off gas treatment apparatus for an electric-propelled LNG carrier having a re-liquefaction function and a method thereof comprising: a boil-off gas cooler (10) which receives natural boil-off gas (N-BOG) produced in an LNG cargo tank and cools the gas through heat exchange with a coolant, a gas compressor (20) which receives the cooled N-BOG from the boil-off gas cooler (10) and compresses the gas to a pressure suitable for use in a DFDE (Duel Fuel Diesel Electric) propelled engine (3), an engine feed gas cooler (30) which cools the N-BOG, whose temperature has risen passing through the gas compressor (20), to a temperature suitable for use in the DFDE propelled engine (3) and supplies the cooled gas to the DFDE propelled engine (3), and a re-liquefaction heat exchanger (50) which receives the extra N-BOG unused in the DFDE propelled engine (3); from the downstream of the engine feed gas cooler (30) and supplies the gas to the LNG cargo tank after cooling and re-liquefying through heat exchange with a coolant. The present invention re-liquefies the extra gas unused for propulsion as well as using the natural boil-off gas produced in the LNG cargo tank as a drive source for propelling a vessel, thereby minimizing the waste of N-BOG.

Description

technical field [0001] The present invention relates to a device and method for treating boil-off gas of an electric propulsion LNG carrier with a reliquefaction function, and in more detail, relates to a method for effectively applying natural boil-off gas generated in an LNG cargo hold as energy to propulsion of a ship, and at the same time A device and method for treating boil-off gas of an LNG carrier capable of reducing waste of remaining gas not used during propulsion as much as possible. Background technique [0002] Generally, a liquefied natural gas carrier (LNG carrier) is a ship that transports liquefied natural gas (LNG) from a production base to a receiving base, and is usually referred to as an LNG carrier or LNGC (LNG Carrier). LNG (Liquefied Natural Gas) liquefies natural gas with methane (CH4) as the main component to minus 162°C under atmospheric pressure. The volume ratio of liquid and gas in LNG is about 1 / 600, and the specific gravity of LNG in the lique...

Claims

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Application Information

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IPC IPC(8): B63H21/20B63H21/12B63B25/08
CPCB63J99/00B63J2099/001Y02T70/5218F25J1/0025F25J1/005F25J1/0072F25J1/0204F25J1/0277F25J1/0288F25J2205/02F25J2230/08F25J2230/30B63B25/08B63H21/12B63H21/20
Inventor 李在翊金喆灏申载雄金浩敬崔永达
Owner STX OFFSHORE & SHIPBUILDING CO LTD
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