Dual-circulation filtering device for evaporation system

The utility model relates to a dual-circulation filtering device for an evaporation system and belongs to the technical field of industrial evaporation. The technical scheme is as follows: the dual-circulation filtering device comprises a liquid-collecting separator (1), a liquid down-flow pipe (2), a filter (3), a heat exchanger (4) and a gas ascending pipe (5), wherein the mounting position of the liquid-collecting separator is higher than that of the heat exchanger, the filter is arranged between the liquid-collecting separator and the heat exchanger, the inlet of the filter is connected with the liquid down-flow pipe of the liquid-collecting separator, the outlet of the filter is connected with a liquid inlet which is formed at the lower part of the heat exchanger, the liquid phase bottommost end of the heat exchanger is connected with the inlet of a circulating pump, and the top of the heat exchanger is connected with the liquid-collecting separator through the gas ascending pipe. With the dual-circulati