Waste gas treatment device

The waste gas treatment device comprises a waste heat boiler (2), a quench cooler (3), an activated carbon injection system (4), a bag type dust collector (5), an alkaline washing tower (6) and a water washing tower (7) which are communicated in sequence, a linkage self-locking device is arranged in an activated carbon injection system for control, activated carbon conveying time and conveying interval time can be set in a central control room, pressure control and alarm are arranged on an activated carbon conveying pipeline, the activated carbon conveying pipeline is linked with the linkage self-locking device, and automatic alarm is achieved when air pressure loss is abnormal or the pipeline is blocked. The bag type dust collector is adopted, flue gas enters the bag type dust collector, dust in the flue gas can be adsorbed on the surface layer of a filter bag, a dust layer is formed, a large amount of activated carbon powder is contained in the dust layer and can continue to react with harmful acid gas in t