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Method and apparatus for the reliquefaction of a vapour

A reliquefaction, evaporative vaporization technology, applied in lighting and heating equipment, container discharge methods, liquefaction and other directions, can solve the problem of not significantly improving thermodynamic efficiency, and achieve the effect of improving thermodynamic efficiency

Active Publication Date: 2011-10-19
CRYOSTAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the method according to EP-A-1132698 does not significantly improve the overall thermodynamic efficiency

Method used

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  • Method and apparatus for the reliquefaction of a vapour
  • Method and apparatus for the reliquefaction of a vapour

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Embodiment Construction

[0022] The figures are not drawn to scale.

[0023] Referring to the drawings, five insulated storage tanks 2, 4, 6, 8 and 10 are provided in the hull (not shown) of a seagoing vessel or other ocean-going vessel. Two or more of the storage tanks 2, 4, 6, 8 and 10 are provided with submerged orifice pipes 12 at their bottom regions through which LNG is introduced. The orifice pipes in tanks 2, 4 and 6 are not shown in the figure because of the simplicity of the figure. If only some storage tanks are provided with submerged orifices, redistribution of returned LNG to tanks not so provided is by operation of liquid pumps (not shown). In normal operation, the orifice tube 12 is submerged in a volume 16 of LNG. In each tank 2, 4, 6, 8 and 10 there is a vapor space 18 above a volume 16 of LNG.

[0024] Although the storage tanks 2, 4, 6, 8 and 10 are insulated, because the boiling point of LNG at normal pressure is much lower than the ambient temperature, in each storage tank 2, ...

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Abstract

Boiled of liquefied natural gas flows from, say, storage tank 10 and is compressed in vapour compression stages 40 and 42. The resulting compressed vapour is condensed in a condenser 46 and the condensate returned to the tank 10. The condenser 46 is cooled by means of a working fluid, for example nitrogen, flowing in a Brayton cycle 60. The Brayton cycle includes a heat exchanger 86 which removesheat of compression from the compressed natural gas vapour upstream of its passage through the condenser 46. In addition a part of the working fluid is withdrawn from a region of the Brayton cycle 60intermediate the working fluid outlet from the condenser 46 and the working fluid inlet to the heat exchanger 86 and the withdrawn working fluid flows through another heat exchanger 88 in which it removes heat of compression from the natural gas vapour intermediate the compression stage 40 and the compression stage 42. The withdrawn working fluid is returned to the Brayton cycle 60.

Description

technical field [0001] The present invention relates to a method and apparatus for reliquefaction of steam, in particular to a method and apparatus for reliquefaction of natural gas vapor operable on ships. Background technique [0002] Typically, natural gas is transported over great distances in a liquefied state. For example, ocean tankers are used to transport liquefied natural gas from a first location where the natural gas is liquefied to a second location where it is vaporized and sent to the gas distribution system. Since natural gas is liquefied at low temperature, i.e. below -100°C, in any practical storage system, LNG will continue to vaporize. Therefore, it is necessary to provide equipment to reliquefy the evaporated vapor. A refrigeration cycle is performed in such an apparatus that involves compressing a working fluid in a plurality of compressors, cooling the compressed working fluid through indirect heat exchange, expanding the working fluid, and heating t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J1/02F17C9/00
CPCF17C2221/033F17C2223/0161F17C2223/033F17C2250/0439F17C2265/03F17C2265/034F17C2265/037F17C2270/0105F25J1/0025F25J1/0045F25J1/005F25J1/0072F25J1/0208F25J1/0277F25J1/0288F25J2220/62F25J2230/04F25J2245/02F25J2210/04F25J1/0265F25J1/0292F17C9/00F25J1/02F25J1/0204F25J2230/60F25J2230/08F25J2205/30
Inventor V·富克斯
Owner CRYOSTAR
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