湿法烟气脱硫旋流喷嘴雾化特性研究

A Study of the Atomization Characteristics of Swirl Spray Nozzles Used in a Wetprocess Flue-gas Desulfurization Unit

雾化喷嘴是湿法烟气脱硫喷淋塔内的关键部件,雾化的优劣直接影响脱硫效率和脱硫剂的利用率。试验以湿法烟气脱硫工艺中常用的空心锥偏心旋流喷嘴为对象,研制了几何相似的系列喷嘴和仅出口直径变化的系列喷嘴,系统研究了空心锥偏心旋流喷嘴的体积流量、雾化粒径、雾化角、雾化粒度分布等特性。试验得到体积流量随压力和喷嘴结构的变化、雾化粒径随压力、流量和喷嘴结构的变化、雾化角随压力的变化等规律,并用平均径跨表示分散度衡量雾化粒度分布,得到随着出口直径的增加平均径跨减小的变化规律。

Atomization spray nozzles are key components in a wet-process flue-gas desulfurization sprinkling tower.The quality of atomization can directly affect desulfurization efficiency and the utilization rate of a desulfurization agent.Tests were conducted with the hollow cone-shaped and eccentric swirl nozzle often used in wet-process flue-gas desulfurization technology serving as an object of investigation.Developed were a series of geometrically similar spray nozzles and also those with a change only in outlet diameters.A systematic study was performed of the above-mentioned nozzle as regards the following characteristics: volumetric flow rate,atomization particle diameter,atomization angle,and atomization particle distribution,etc.From the tests a set of rules or laws governing the following factors were obtained: the variation of volumetric flow rate with a change in pressure and spray nozzle structure,the variation of atomization particle diameter with a change in pressure,flow rate and spray nozzle structure,the variation of atomization angle with a change in pressure,etc.Average-diameter span was used to indicate the dispersion degree for judging the distribution of atomization particles.Identified was a variation law governing a decrease in average diameter span with an increase in outlet diameter.