Smoke purifying and waste heat recycling device for low-grade composition brass smelting and control method of smoke purifying and waste heat recycling device

Disclosed is a smoke purifying and waste heat recycling device for low-grade composition brass smelting. A top-blown converter of the smoke purifying and waste heat recycling device is in a shape with bigger middle part and smaller round ends, a flue-type waste heat boiler is arranged at a smoke outlet at the top end of the top-blown converter, a water cooled furnace wall of the waste heat boiler is provided with an oxygen enrichment nozzle and a vibrating spring, an oxygen online detector is arranged at an outlet of the waste heat boiler, the flue-type waste heat boiler is connected with a spray cooling tower which is a connected with a plate-type cooler via a smoke pipe, the plate-type cooler is connected with a bag collector via an outlet smoke pipe, the smoke pipe between the plate-type cooler and the bag collector is provided with an activated carbon jet device and a shock cooling air suction valve, an outlet of the bag collector is connected with a smoke exhaust fan, and an outlet of the smoke exhaust fan is connected with the lower end of a chimney. By the aid of the smoke purifying and waste heat recycling device, temperature of the smoke can be lowered to below 170 DEG C, waste heat in the smoke can be recycled, halogen in the smoke can be prevented from corroding inner walls of the boiler, running life of the boiler can be prolonged, valuable metal in the smoke can be recycled, and contained dust in exhausted smoke is enabled to be lower than 25mg/Nm .