Device and method for removing SO2 in flue gas by recycling garbage combustion fly ash

The invention belongs to the technical field of waste incineration fly ash treatment, and particularly relates to a device and a method for removing SO2 in flue gas by recycling waste incineration fly ash. The device comprises a waste incineration flue gas purification system and a fly ash treatment system, the waste incineration flue gas purification system comprises a desulfurization tower, a dust remover and a chimney which are sequentially connected. The fly ash treatment system comprises a fly ash collecting device, a water washing device, a drying device, an ultrasonic device, an isopropanol solution storage tank and a centrifugal device; the fly ash collecting device is connected with the dust remover; and the desulfurization tower is connected with the centrifugal device. The fly ash with high specific surface area can be obtained, and desulfurization and deacidification can be effectively realized, so that fly ash reutilization is realized, and meanwhile, the cost is low.