The advantages of spray tower are simple structure, low cost, small pressure drop of gas, no clogging. It is currently widely used in wet desulfurization systems. Its main feature is completely open. In addition to the spraying nozzles, there are no other internal facilities. The nozzle is the main accessory of the spray tower, the nozzle is required to be able to provide fine uniformly sized droplets to enable the effective operation of the spray tower.