SCR (Selective Catalytic Reduction) reactor system capable of realizing in-situ regeneration and use method thereof

The invention relates to the technical field of environment-friendly denitration, and discloses an in-situ regenerative SCR reactor system and a using method thereof.According to the system, an SCR reactor is divided into j independent subareas, all the subareas are independent from an inlet to an outlet, and each subarea is connected with an original flue gas inlet and outlet baffle and a regenerated flue gas inlet and outlet valve; the induced draft fan, the regenerated flue gas inlet valve, the regeneration fan, the flue gas heat exchanger, the flue gas heater and the regenerated flue gas inlet and outlet valve of each subarea are communicated in sequence; and the regenerated flue gas inlet and outlet valve of each subarea, the flue gas heat exchanger, the waste gas exhaust valve and the original flue gas inlet of the desulfurization tower are communicated in sequence. The problems that in the prior art, due to gasification, decomposition and the like of ammonium bisulfate, sulfide and ammonia in flue gas