Device and method for desulfurization and dust removal by spraying quick lime powder with supersaturation water

The invention relates to a device and a method for desulfurization and dust removal by spraying quick lime powder with supersaturation water and belongs to the technical field of environmental conservation, desulfurization and dust removal. The device comprises an electrostatic dust remover, a flue and a bag-type dust remover, wherein the electrostatic dust remover is connected with one end of the flue, the bag-type dust remover is connected with the other end of the flue; and the device is also provided with a water spraying and atomizing system and a fly ash recirculating system, wherein the water spraying atomizing system is opened at the end, close to the electrostatic dust remover, of the flue, the water spraying atomizing system sprays water mist to the flue, the fly ash recirculating system is opened at the end, away from the electrostatic dust remover, of the flue, the fly ash recirculating system is connected with the bag-type dust remover, and the fly ash recirculating system sprays the mixture of CaO and fly ash to the flue. The fly ash is the ash in an ash bucket of the bag-type dust remover.