A BOG RE-LIQUEFACTION SYSTEM AND METHOD FOR LNG CARRIER

摘要

Pass through heat exchangers in the multiple general refrigeration cycles re-liquefied for marsh and automatic heat exchanger, a kind of system of marsh (gas evaporation) re-liquefied carrier of generally one LNG (liquefied natural gas) is arranged to reduction system and embogs by passing sequentially through, it greatly reduces power consumption and entire coefficient improves efficiency and uses general refrigeration cycles, use a relatively small amount refrigerant, it provides a method, for using the marsh of liquified natural gas carrier (LNGC) of system re-liquefied. A kind of system, the marsh (gas evaporation) for being used for the LNG (liquefied natural gas) that carrier includes are re-liquefied: the marsh compressor (10) generated when the LNG being stored in an oil storage is vaporized by heat from outside compresses marsh and penetrates oil storage; One distributor (20) is used to provide a part in the marsh of compression to DF (fuel combination) engine and to a re-liquefied unit and provides the marsh of remaining compression; Refrigeration cycles (40,60,70) are used for the cooling re-liquefied unit marsh of supply; One expansion valve (90), the stage for being used to that cooling marsh to be selected to change marsh from gas to liquid by adiabatic expansion.