Install the grading ring at the inlet of absorption tower to make the smoke flow field more uniform, adopt the spray layer control technology and the high-performance low-power consumption spiral nozzle with three cutting directions, 100-degree coverage, and particle diameter less than 1000μm to strengthen the gas-liquid mass transfer, and finally achieve more than 99.5% desulfurization efficiency and more than 75% synergistic dust removal efficiency after repeated defogging.