A bog reliquefaction and lng regasification integrated system and working method

Abstract

The invention discloses a BOG reliquefaction and LNG regasification integrated system, including a BOG reliquefaction subsystem, an LNG regasification subsystem and an intermediate medium circulation subsystem. Among them, the BOG reliquefaction subsystem and the intermediate medium circulation subsystem exchange heat through the second heat exchanger; the intermediate medium circulation subsystem and the LNG regasification subsystem exchange heat through the first heat exchanger; the BOG reliquefaction subsystem It is connected with the LNG regasification subsystem through the LNG liquid storage tank. The invention transfers the cold energy released during LNG gasification from the intermediate medium circulation subsystem to BOG reliquefaction, realizes effective utilization of energy and achieves energy saving effect. The invention is suitable for simultaneous use of BOG reliquefaction and LNG gasification, and can also be used alone for LNG gasification, and has good engineering value. The invention also discloses a working method of the BOG reliquefaction and LNG regasification integrated 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.

Images