Variable working condition adjusting system of BOG reliquefaction system

The utility model relates to a BOG reliquefaction system, in particular to a variable working condition adjusting system of the BOG reliquefaction system. A variable working condition adjusting method of a BOG reliquefaction system comprises a compressor, a precooling inlet valve, a BOG reliquefaction heat exchanger, an expansion machine, a recovery tank, a low-pressure valve, a high-pressure valve, a bypass valve, a working medium supercharger and a working medium generator. The system has the beneficial effects that the power of the reliquefaction system can be improved and reduced according to the BOG side cooling capacity requirement, and energy consumption is reduced. The BOG reliquefaction system can carry out variable working condition adjustment through a working medium recovery tank and a bypass mode, and the control mode is simple. Key equipment of the refrigerating system is the compressor and the expansion machine, the variable-frequency compression expansion machine is high in price, the variable