Ultra-clean discharge wet filtering defogging dust removal device and method

The invention discloses an ultra-clean discharge wet filtering defogging dust removal device and method. The device comprises a shell provided with an upper outlet and a lower inlet, wherein the shell is internally provided with a filter screen set which is in a type of vertical back and forth folding and is of an impact structure, and the filter screen set is in airtight connection with the shell; a steel pipe for supporting the filter screen set is arranged above the filter screen, cold water nozzles are uniformly distributed on the steel pipe, and spray water of the nozzles is required to cover the whole filter screen set; the outer part of the shell is provided with a circulation tank with a sedimentation-filtration function, the circulation tank is provided with a circulating pump which is connected with the steel pipe, and the bottom part of the shell is provided with a return pipe which is communicated with the circulation tank. When dust-containing fog passes through the filter screen set by entering