Draught fan control system for ammonia gas recovery device

The utility model discloses a draught fan control system for an ammonia gas recovery device. The draught fan control system for the ammonia gas recovery device comprises an ammonia gas discharge pipe and a control cabinet. The ammonia gas discharge pipe is sequentially connected with a first control valve, a draught fan set, a second control valve and an ammonia gas collecting device through a pipeline; the control cabinet is electrically connected with the draught fan set; the control cabinet comprises a frequency converter, a PLC and a switch used for selection of draught fan operation modes, the PLC is respectively connected with the frequency converter and the switch, and the frequency converter is connected with the draught fan set. According to the draught fan control system, operation of the draught fan set is controlled in the mode that operation modes of various combinations are achieved through the control cabinet, proper operation modes are selected to control operation of the draught fan set according to the actual emission load of ammonia gas, it is guaranteed that the ammonia gas is effectively recovered, energy consumption of the draught fan set is reduced, the service life of the draught fan set is prolonged, and enterprise cost is saved. The draught fan control system for the ammonia gas recovery device is simple in design, convenient to operate and easy to popularize.