Works mist spray tower exhaust duct introduced by purification tower, after packing layer, exhaust and sodium hydroxide to absorb liquid-liquid two-phase full contact absorption and reaction, purified acid mist emissions, then by demisting dehydration defog the rear plate by the fan into the atmosphere. After absorbing liquid pump pressurized spray down at the top of the column bottom, and finally recycled back to the bottom. Purified acid mist emissions to meet emission standards for emission requirements. ① high dust removal efficiency, water with an alkaline washing, desulfurization efficiency up to 90%; ② equipment footprint, easy installation; ③ water consumption, lower power consumption indicators; ④ corrosion, wear, long service life; ⑤ reliable equipment operation, maintenance is simple and convenient. Spray tower packing layer as a liquid two-phase contact members of mass transfer equipment. The bottom of the packed column equipped with packing support plate, filling way to huddle placed on the support plate. Installed above the filler filler plate to avoid being blown updraft. Spray tower spray liquid from the top through the liquid is sprayed onto the filler distribution and flow down along the surface of the filler. Gas is fed from the bottom, the gas distribution system after the distribution, and continuous countercurrent liquid through the gap filler layer was on the filler surface, the two-phase gas-liquid mass transfer in close contact. When the liquid flows downward along the filler layer, sometimes wall-flow phenomenon, wall liquid two-phase flow effects caused by the uneven distribution of the filler layer, so that the mass transfer efficiency. Therefore, spray tower packing layer is divided into two sections, the middle set redistribution device, after redistribution to the upper and lower spray filler.