Optimized two-circulating flue gas dust removal and desulfurization device

The utility model discloses an optimized two-circulating flue gas dust removal and desulfurization device, which comprises an absorbing liquid conveying unit, a flue gas purification unit and an absorbing liquid after-treatment unit, wherein the flue gas purification unit comprises a Venturi scrubber, a packed tower, a first-stage circulating pool, a first-stage absorbing liquid circulating pump, a second-stage circulating pool and a second-stage absorbing liquid circulating pump, and the first-stage circulating pool and the second-stage circulating pool are arranged below the desulfurization packed tower and are partitioned by an annular partition plate; and an air aerator is also arranged at the bottom of the first-stage circulating pool. In the device disclosed by the utility model, the Venturi scrubber can carry out the temperature reduction, dust removal and pre-desulfurization for high temperature flue gas, and the packed tower can carry out the efficient desulfurization for the pre-desulfurized flue gas. The device has high dust removal and desulphurization efficiency, smaller occupied area, low investment, and can be suitable for desulfurization processes of various flue gases and especially suitable for the treatment process of regenerated flue gas in a catalytic cracking unit.