Cooling crystallizer for ammonium sulfite solution

The utility model belongs to the technical field of flue gas desulfurization and particularly relates to a flue gas desulfurization technical facility through an ammonia-ammonium sulfite method, in particular to a cooling crystallizer for an ammonium sulfite solution. The cooling crystallizer comprises a crystallization tank body, a stirrer and an interface connected with a conveying pipeline, and is characterized in that the crystallization tank body is of a cylindrical container with the conical bottom, the cylindrical tank body is of a sandwich structure, a material discharge port is arranged at the conical cylinder bottom, an arch-shaped cover top is buckled with the tank body through a bolt, a stirrer shaft in the tank penetrates the cover top and is connected with a motor, a feed port and an exhaust port are separately arranged on the cover top, and the exhaust port is connected with a tail gas filtering device through a pipeline. The cooling crystallizer disclosed by the utility model can realize the crystallization of ammonium sulfite without heating the solution by adopting a cooling crystallization method so as to reduce energy consumption, simplify a system and reduce cost.