LNG Re-liquefaction system of LNG vessel and micro-channel plate type heat exchanger for the same

摘要

The re-liquefaction system and the micro-channel plate type heat exchanger of the LNG carrier according to the present invention are characterized in that a plurality of low-pressure evaporation gases discharged from the LNG storage tank are distributed and heat-exchanged, Low-pressure flow path plates in which microchannels to be flowed are formed; Pressure flow path plates in which micro-channels through which the high-pressure evaporation gas flows are formed alternately with the plurality of low-pressure flow path plates so that the high-pressure evaporation gas that is heat-exchanged with the low-pressure evaporation gas can be distributed; And a low pressure intake manifold, a low pressure exhaust manifold, a high pressure intake manifold, and a high pressure exhaust manifold; Wherein the microchannels of each high-pressure flow path plate are divided into a plurality of units independent of the heat exchange step so that the high-pressure evaporation gas can be sequentially heat-exchanged with the low-pressure evaporation gas in multiple stages; The high-pressure intake manifold and the high-pressure exhaust manifold are respectively provided with a plurality of high-pressure intake manifolds, and the fluid collected and discharged from any one of the high- Pressure flow path plates to be distributed to the next unit of the high-pressure flow path plates through the manifold. The use of the re-liquefaction system and the micro-channel plate type heat exchanger of the LNG carrier according to the present invention has an advantage of improving the heat exchange performance per unit heat exchange capacity.