BOG reliquefaction and LNG regasification integration system and working method

Abstract

The invention discloses a BOG reliquefaction and LNG regasification integration system. The BOG reliquefaction and LNG regasification integration system comprises a BOG reliquefaction subsystem, an LNG regasification subsystem and an intermediate medium circulation subsystem, wherein the BOG reliquefaction subsystem and the intermediate medium circulation subsystem carry out heat exchange througha second heat exchanger, intermediate medium circulation subsystem and the LNG regasification subsystem carry out heat exchange through a first heat exchanger, and the BOG reliquefaction subsystem andthe LNG regasification subsystem are connected through an LNG liquid storage tank. According to the BOG reliquefaction and LNG regasification integration system, cold energy emitted during gasification of LNG is transferred by the intermediate medium circulation subsystem to be used for reliquefaction of BOG, effective utilization of energy is achieved, and the effect of energy saving is achieved. The BOG reliquefaction and LNG regasification integration system is suitable for carrying out BOG reliquefaction and LNG gasification at the same time, and can also be used for LNG gasification only, and therefore, the system has good construction value. The invention further discloses a working method of the BOG reliquefaction and LNG regasification integration system.

Description

technical field [0001] The invention relates to the field of cryogenic fluid phase change heat transfer technology, in particular to a BOG reliquefaction and LNG regasification integrated system, which can transfer cold energy released during LNG regasification for BOG reliquefaction. Background technique [0002] Natural gas reserves are abundant, cheap, clean and environmentally friendly. Therefore, in recent years, my country has vigorously promoted the use of natural gas. Under normal pressure, the critical temperature of LNG reaches -163°C, so the internal temperature of the storage tank is controlled at -163°C or even lower during the storage of LNG. Although the insulation effect of the storage tanks used is very good, there is still heat inevitably intruding, resulting in the gasification of LNG to generate flash gas (Boil Off Gas, BOG for short). Due to the large reserves of LNG, the corresponding amount of BOG produced is also large. The generation of BOG will le...

AI Technical Summary

Problems solved by technology

The refrigerators used in the preparation of liquid nitrogen in this system are pulse tube refrigerators, and the cooling effect of a single pulse tube is poor. A large number of pulse tubes must be connected in series to achieve the low temperature for liquefying nitrogen, which makes the system more complicated.

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