Small skid-mounted evaporation gas reliquefaction and recovery device for liquefied natural gas

A liquefied natural gas and recovery device technology, applied in liquefaction, refrigeration, liquefaction, solidification, etc., can solve the problems of being unsuitable for LNG transport tankers, small LNG storage tanks, LNG vehicle filling stations, expensive prices, and complicated processes. Achieve the effect of low operation and maintenance cost, low cost and low refrigeration temperature

Inactive Publication Date: 2014-04-30
SHANGHAI JIAO TONG UNIV +1
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Problems solved by technology

[0004] After searching the existing technical literature, it was found that the "LNG Evaporated Gas Recovery and Reliquefaction Device" disclosed in the Chinese utility model patent CN202012731U uses the above-mentioned traditional reliquefaction technology, bu

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  • Small skid-mounted evaporation gas reliquefaction and recovery device for liquefied natural gas

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[0028] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be pointed out that for those of ordinary skill in the art, a number of modifications and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0029] The small skid-mounted liquefied natural gas boil-off gas reliquefaction recovery device disclosed by the present invention adopts a regenerative low-temperature refrigerator, which can realize zero loss during the storage and transportation of liquefied natural gas (LNG). The device uses a small regenerative low-temperature refrigerator as the cold source to liquefy the boil-off gas BOG produced during LNG storage and transportation. The refrigerator has low refrige...

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Abstract

The invention provides a small skid-mounted evaporation gas reliquefaction and recovery device for liquefied natural gas. The small skid-mounted evaporation gas reliquefaction and recovery device comprises a cryogenic storage tank (1), a regenerative cryo refrigerator (3), an externally-finned condensing heat exchanger (4), a pressure testing device (5), a temperature testing device (6), a heating device (7) and a control system (8). Real-time monitoring and stepless regulation can be performed on cryogenic temperature and output cold of the cryo refrigerator according to requirements on actual pressure and heat loads inside the cryogenic storage tank, and zero consumption of an LNG (liquefied natural gas) storage tank system can be realized; pumpless circulation of gas liquid flow inside the device can be realized by relying on self differential pressure and gravity; the small skid-mounted evaporation gas reliquefaction and recovery device is low in system energy consumption, compact in structure, simple in technology process, high in reliquefaction efficiency and low in operation and maintenance costs, and skid mounting of the device can be realized.

Description

technical field [0001] The present invention relates to the technical field of reliquefaction and recovery of boil-off gas (BOG) during the storage and transportation of liquefied natural gas (LNG), and more specifically relates to a small skid-mounted BOG re-liquefaction system using a regenerative cryogenic refrigerator. Liquefaction recovery unit. Background technique [0002] Liquefied natural gas (LNG for short), the main component is methane, is recognized as the cleanest energy on earth. Colorless, odorless, non-toxic and non-corrosive, its volume is 1 / 625 of the volume of the same volume of gaseous natural gas, and the weight of liquefied natural gas is only about 45% of the same volume of water. Gaseous natural gas is compressed and cooled to its boiling point (-161.5°C) to become LNG, stored in low-temperature storage tanks, transported by special ships or tank trucks, and re-gasified when used. Compared with gaseous natural gas, due to its small size and high st...

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Application Information

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IPC IPC(8): F25J1/02
Inventor 巨永林郝熙欢祝铁军李海冰
Owner SHANGHAI JIAO TONG UNIV
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