Lng bog reliquefaction apparatus

A technology for re-liquefaction and liquefaction of natural gas, applied in the direction of liquefaction, refrigeration and liquefaction, electrical components, etc., can solve problems such as unfavorable and rapid coping with conditions, changes, blade damage of turbines, etc.

Inactive Publication Date: 2008-07-16
SHINYOUNG HEAVY IND
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  • Claims
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Problems solved by technology

However, depending on the operating conditions of the transport, this common technique has disadvantages due to the fact that if the quantity or temperature vapor causes and so on changes and quickly copes with changes in conditions
Moreover, if the temperature nitrogen is greatly reduced by the expansion turbine, the temperature nitrogen reaches the liquefaction temperature to facilitate the effect of liquid droplets, causing and causing damage to the blades of the turbine

Method used

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  • Lng bog reliquefaction apparatus
  • Lng bog reliquefaction apparatus
  • Lng bog reliquefaction apparatus

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Embodiment Construction

[0078] The present invention will be described in detail with reference to FIGS. 2 to 13 . The following description is only made in connection with a more similar embodiment of the present invention. Temperatures and pressures are represented herein and the invention is not limited to these values.

[0079] The apparatus and method of the present invention for reliquefying LNG vapor according to the first embodiment of the present invention are described in detail with reference to FIGS. 2 to 4 .

[0080] Vapor Coil Apparatus Natural gas is liquefied in a gas phase and stored in a storage tank 110 at a low temperature at atmospheric pressure (1.013 bar). During the transportation of LNG, the vapor is caused due to the continuous heat transfer from the outside and increases the pressure in the storage tank 110 .

[0081] Always maintain the pressure in the storage tank 110 at the level of atmospheric pressure, the safety valve 111 opens and the vapor is released outside the ...

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Abstract

The invention provides a low-temperature liquefied natural gas (liquefied natural gas) in a boil-off gas (boil-off gas, BOG) transport storage tank. Apparatus for reliquefaction of liquefied natural gas vapors, comprising a compressor for compressing methane in a storage tank for liquefied natural gas, a condenser for at least partial condensing of the methane compressed by the compressor, and nitrogen cycle equipment to supply heat and cold to the compressor from condensation The reliquefied vapor is returned from the compressor to the storage tank, and the vapor gas is compressed by the compressor in the pre-cooled condenser, so the advantage is that the temperature of the reliquefied vapor is maintained within a preset range even if the quantity or temperature of the reliquefied vapor changes. Further, the present invention incorporates a cooling device constituting a low temperature section in the device for reliquefied LNG in order to reduce the size of the device for reliquefied LNG and stably process a low temperature range of nitrogen gas without cold heat loss.

Description

Technical field: [0001] The present invention relates to a reliquefying boil-off gas device (reliquefying boil-off gas, BOG), in particular to a low-temperature liquefied natural gas device (Liquefied natural gas, LNG) capable of storing and transporting. Background technique: [0002] Generally speaking, long-distance transportation of natural gas is in a liquefied state. For example: Liquefied natural gas is a transportation system for transporting liquefied natural gas from the first point where the natural gas is liquefied to the second point where the liquefied natural gas is vaporized, and the gas is transported. Because natural gas is liquefied under normal pressure and extremely low temperature, its temperature is about -163 degrees, and the external heat is transferred to the storage tank of the liquefied natural gas to continuously evaporate the liquefied natural gas in the storage tank. If the pressure in the storage tank exceeds the preset safety pressure, the v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G5/00F25J1/02H01L21/8242B63H21/16
CPCF25J1/0025F25J1/004F25J1/0045F25J1/005F25J1/0052F25J1/0072F25J1/0208F25J1/0265F25J1/0292F25J2220/62F25J2235/60F25J2240/60F25J2210/04F25J2205/30F25J2205/90
Inventor 洪仪硕李伦杓
Owner SHINYOUNG HEAVY IND
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