Compressor

a compressor and liquefied natural gas technology, applied in the direction of positive displacement liquid engines, container discharging methods, lighting and heating apparatuses, etc., can solve the problems of large motors and substantial power consumption, and achieve the effect of reducing size and power consumption
US20080008602A1Inactive Publication Date: 2008-01-10THE BOC GRP PLC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
THE BOC GRP PLC
Publication Date
2008-01-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

A rotary liquefied natural gas boil-off compressor has a series of compression stages. A gas passage passes through the series of compression stages. The gas passage extends through and is in heat exchange relationship with cooling means in the form of indirect heat exchangers. Each of the heat exchangers is cooled by LNG supplied from a pipeline. Flow control valves are provided for controlling the flow of LNG to the heat exchangers respectively. The valves are controlled in response to temperature sensors respectively, so as to maintain the inlet temperature of each of the compression stages at a chosen sub-ambient temperature or between chosen sub-ambient temperature limits.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] National Stage application of International Application No. PCT / EP2005 / 000279 filed Jan. 13, 2005, which claims priority to British Application No. GB 0400986.6 filed Jan. 16, 2004.BACKGROUND OF THE INVENTION

[0002] This invention relates to a rotary liquefied natural gas boil-off compressor. The invention also relates to a method of compressing boiled-off natural gas.

[0003] Liquefied natural gas is required to be stored in thermally-insulated tanks. Notwithstanding the thermal insulation, there is always a discernible inflow of heat from the surroundings which causes the liquefied natural gas to boil at a modest rate. The resulting boiled-off liquefied natural gas may be compressed and reliquefied or may be used as a fuel. Use of the boiled-off natural gas as a fuel usually requires its compression. For example, it has been proposed to use the boil-off gas from a shipboard liquefied natural gas storage tank to fuel a gas turbine forming par...

Claims

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