Boil-off gas recovery system
a gas recovery and boil-off technology, applied in the direction of liquefaction, transportation items, light and heating equipment, etc., can solve the problems of insufficient removal of oil constituents in boil-off gas, failure to capture oil constituents in gas state with filters, etc., to reduce risk, reduce condensation, and reduce the effect of heat exchanger
Inactive Publication Date: 2018-08-02
KOBE STEEL LTD
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Benefits of technology
This patent describes a system for efficiently cooling and condensing the gas produced by a compressor. The system uses a heat exchanger to cool the gas produced by the compressor before it is liquefied. This reduces the amount of cold needed for liquefaction, which allows for a smaller heat exchanger. The system also uses a separate cooling medium for the gas produced by the compressor, which further reduces the size of the system. The gas produced by the compressor contains oil, which can solidify and block pipes. The system prevents this by controlling the temperature of the gas and removing any oil in a liquid state that could impair heat transfer. Overall, the system improves cooling efficiency and reduces the size of the oil production unit.
Problems solved by technology
However, although the boil-off gas recovery system of JP-2015-158263 A can capture the oil constituent in a liquid state with the filter, it fails to capture the oil constituent in a gas state with the filter.
Thus, the oil constituent contained in the boil-off gas cannot be sufficiently removed by this system.
As a result, the boil-off gas recovery system of JP-2015-158263 A has such a problem that the oil constituent is mixed into the tank.
Method used
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[0031]Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that, for convenience of explanation, the drawings referred to hereinafter show only principal constituent elements, necessary for describing the boil-off gas recovery system according to the embodiments of the present invention, in a simplified manner. Thus, the boil-off gas recovery system according to the embodiments of the present invention may include any constituent elements that are not illustrated in the drawings referred to in the present specification.
[0032]FIG. 1 is a schematic block diagram illustrating a boil-off gas recovery system 1 according to a first embodiment. FIG. 2 is a schematic block diagram illustrating a reliquefying system 9 of the boil-off gas recovery system 1 according to the first embodiment. The boil-off gas recovery system 1 is installed in a vessel that carries liquefied gas such as liquefied natural gas. The boil-off gas recovery system 1 ...
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A boil-off gas recovery system 1 includes a tank 2 storing liquefied gas, an oil supply type compressor 3b for compressing boil-off gas generated by partial evaporation of the liquefied gas in the tank 2, and a reliquefying system 9 for liquefying the boil-off gas compressed by the oil supply type compressor 3b and returning the liquefied gas that has been liquefied to the tank 2. The reliquefying system 9 includes a heat exchanger for oil constituent condensation 11 for cooling down the boil-off gas to a temperature equal to or lower than a condensation temperature of an oil constituent contained in the boil-off gas, a separator 14 for separating the oil constituent condensed by the heat exchanger for oil constituent condensation 11 from the boil-off gas, and a reliquefying portion for liquefying the boil-off gas from which the oil constituent is separated.
Description
BACKGROUND OF THE INVENTIONField of the Invention[0001]The present invention relates to a boil-off gas recovery system for recovering boil-off gas generated in a tank storing liquefied gas.Description of the Related Art[0002]In a liquefied natural gas carrying vessel, boil-off gas is generated in a tank storing the liquefied natural gas. Such boil-off gas is effectively utilized as fuel for an engine, a steam boiler, and a generator in the vessel, and / or returned to the tank after being reliquefied. As a technique for reliquefying the boil-off gas generated in the tank and returning it to the tank, a boil-off gas recovery system described in JP-2015-158263 A has been known.[0003]In the boil-off gas recovery system described in JP-2015-158263 A, the boil-off gas generated in the tank is compressed by an oil supply type compressor to reliquefy a part of the boil-off gas, and the reliquefied boil-off gas is returned to the tank. In this process, the boil-off gas compressed by the oil s...
Claims
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IPC IPC(8): F25J1/00F25B41/40
CPCF25J1/0025F25J2220/02F25B43/02F25B41/40F25J1/004F25J1/005F25J1/0202F25J1/023F25J1/0279F25J1/0297B60P3/2245B60P3/228B60P3/30B60P1/36B60R16/033B65G37/00B65G33/10B65G2207/14B65G2201/04B65G2812/0577B60Y2200/146
Inventor TEZUKA, SATOSHISEYAMA, KATSUHIRONAGURA, KENJI
Owner KOBE STEEL LTD