Thermal control boiler tail gas treatment device for power plant and treatment method of thermal control boiler tail gas treatment device

The invention discloses a thermal control boiler tail gas treatment device for a power plant and a treatment method of the thermal control boiler tail gas treatment device. A filter screen plate assembly is arranged in the pretreatment bin; the filter screen plate assembly comprises a filter screen plate, an elastic plate, a fixed block and a convex block; a sliding groove is formed in the front wall or the rear wall of the pretreatment bin; at least two filter screen plates are longitudinally arranged in the pretreatment bin in a sliding manner; the front end or the rear end of the filter screen plate extends out of the sliding chute in a penetrating manner; the left end or the right end of the filter screen plate abuts against the multiple protruding blocks. The outer ends of the protruding blocks are fixedly connected with the inner ends of the elastic plates, and the elastic plates are in a compressed state. The outer end of the elastic plate is fixedly connected with the inner end of the fixed block; and