Granulation tower dust recovery device and dust recovery method

The invention discloses a dust recovery device for a granulation tower. The dust recovery device is mounted at an air outlet of the granulation tower. The dust recovery device comprises a demisting section and a spraying and absorbing section, a water curtain is arranged below the dust recovery device, a ring pipe is arranged on the water curtain, a plurality of fan-shaped nozzles are mounted on the ring pipe, and a right-angle nozzle assembly is further arranged in the dust recovery device. The dust recovery device adopts three-section type separation and absorption, so that the dust removal effect is improved, the dust removal effect is ensured, and meanwhile, the urea hydrolysis waste liquid is prevented from being taken out of the granulation tower to cause secondary pollution. The invention further discloses a granulation tower dust recovery method which comprises the steps 1-5, and the dust recovery method further comprises the operation steps of the dust recovery device and the electrostatic capture de