湿法烟气脱硫旋流喷嘴雾化特性研究

1引言石灰石/石灰-石膏湿法脱硫是目前的主流烟气脱硫工艺,其核心设备是脱硫吸收塔,较常用的塔型是喷淋塔1]。雾化喷嘴是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。通常多用旋流压力式喷嘴,其中空心锥旋流喷嘴最为常见,系统地研究旋流喷嘴雾化特性对湿

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

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.