Boil-off gas reliquefaction system and method for discharging lubricating oil in boil-off gas reliquefaction system
A technology for evaporating gas and reliquefaction, which is applied in container discharge method, gas/liquid distribution and storage, gas treatment/storage purpose, etc., and can solve problems such as LNG loss, impact on transportation efficiency, tank damage, etc.
Active Publication Date: 2020-04-03
DAEWOO SHIPBUILDING & MARINE ENG CO LTD
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Problems solved by technology
[0005] The generation of boil-off gas means the loss of LNG and thus has a great impact on the transport efficiency
Furthermore, when boil-off gas accumulates in the storage tank, there is a risk that the pressure inside the storage tank increases excessively, causing damage to the tank
Method used
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[0075] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The boil-off gas reliquefaction system according to the present invention can be applied to various ships such as ships equipped with engines fueled by natural gas, ships including liquefied gas storage tanks, ship structures, and the like. It should be understood that the following examples can be modified in various ways and do not limit the scope of the present invention.
[0076] Furthermore, the fluid in each fluid supply line of the system according to the invention may have a liquid phase, a vapor-liquid mixed phase, a vapor phase and a supercritical fluid phase, depending on the operating conditions of the system.
[0077] figure 1 is a schematic diagram of a boil-off gas reliquefaction system according to a first embodiment of the present invention.
[0078] see figure 1 , The boil-off gas reliquefaction system according to this embodime...
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A boil-off gas reliquefaction system is disclosed. The boil-off gas reliquefaction system comprises: a compressor for compressing boil-off gas; a heat exchanger for subjecting the boil-off gas compressed by the compressor to heat exchange, and thus cooling same, by using the boil-off gas before being compressed by the compressor as a refrigerant; and a decompressing device installed at the rear end of the heat exchanger, and decompressing the fluid cooled by the heat exchanger. The boil-off gas reliquefaction system comprises at least one among: a first temperature sensor installed at the front end of a low-temperature flow path of the heat exchanger, and a fourth temperature sensor installed at the rear end of a high-temperature flow path of the heat exchanger; a second temperature sensorinstalled at the rear end of the low-temperature flow path of the heat exchanger, and a third temperature sensor installed at the front end of the high-temperature flow path of the heat exchanger; and a first pressure sensor installed at the front end of the high-temperature flow path of the heat exchanger, and a second pressure sensor installed at the rear end of the high-temperature flow path of the heat exchanger. The compressor comprises at least one oil-lubricated cylinder.
Description
technical field [0001] The present invention relates to a method and system for reliquefaction of boil-off gas (BOG) produced via natural vaporization of liquefied gas, and more particularly, to a boil-off gas reliquefaction system in which the Of the boil-off gas generated in a storage tank of a liquefied natural gas (LNG) ship where fuel is supplied to the engine, the excess boil-off gas above the engine's fuel requirement is reliquefied using the boil-off gas as a refrigerant. Background technique [0002] Recently, consumption of liquefied gas such as liquefied natural gas (LNG) has been rapidly increasing worldwide. Liquefied gas obtained by cooling natural gas to extremely low temperatures has a much smaller volume than natural gas and is therefore more suitable for storage and transportation. Furthermore, because air pollutants in natural gas can be reduced or removed during the liquefaction process, liquefied gases such as LNG are eco-friendly fuels with low air pol...
Claims
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IPC IPC(8): B63B25/16B63H21/38F17C6/00F17C9/02F17C13/00
CPCB63B25/16B63H21/38F17C2227/0339F17C2265/017F17C2265/033F17C2265/037F17C2265/038F17C2270/0105F25J1/0025F25J1/0202F25J1/004F25J2245/02F25J1/0277F25J2210/06F25J1/023F25J1/0244F25J1/0279F25J2205/84F25J2205/02F25J2220/60F25J2240/40F25J1/0248F25J2210/42F17C2223/033F17C2223/043F17C2221/033F17C2223/0161F17C2225/047F17C9/04F17C2250/043F17C2250/0439F17C2260/035F17C2265/034F25J1/0247F17C6/00F17C9/02F17C13/004F17C13/00F17C2265/031
Inventor 李準採崔东圭申铉俊
Owner DAEWOO SHIPBUILDING & MARINE ENG CO LTD