Double-tower ammonia desulfurization device

The patent discloses a double-tower ammonia desulfurization device. The device comprises a desulfurization absorption tower, a concentration pump, a crystallization pump and an oxidation tower, wherein the concentration pump and the crystallization pump are arranged at the bottom of the desulfurization absorption tower; the internal space of the desulfurization absorption tower is divided into a spray absorption section for spraying ammonia-containing absorption solution and a cooling concentration section for cooling ammonia sulfate solution from top to bottom; the oxidation tower is used for oxidizing and concentrating ammonium sulfite solution into the ammonia sulfate solution and is connected with the desulfurization absorption tower through a pipeline; a spray layer is arranged in the spray absorption section in the desulfurization absorption tower; and the oxidization tower is connected with the spray layer of the desulfurization absorption tower through a primary circulating pump and a secondary circul