Zero-energy-consumption suction dryer special for PSA (Pressure Swing Adsorption) air separation

The utility model discloses a zero-energy-consumption suction dryer special for PSA (Pressure Swing Adsorption) air separation, which comprises a first drying tank and a second drying tank, and top connecting pipelines are arranged at the tops of the first drying tank and the second drying tank; bottom connecting pipelines are arranged at the bottoms of the first drying tank and the second drying tank; the bottom connecting pipelines are communicated with an air inlet of the PSA air separation equipment; the first drying tank and the second drying tank are the same in structure; the first drying tank and the second drying tank each comprise a tank body, a drying assembly detachably installed on the outer wall of the tank body and a blocking structure arranged in the tank body, and the blocking structures are used for changing the flowing direction of compressed air so that the compressed air can enter the drying assemblies. The drying assembly is provided with a gas return pipeline communicated with the impur