湿法脱硫旋流喷嘴体积流量变化规律及数值模拟

以湿法烟气脱硫工艺中常用的旋流喷嘴为对象,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,并选择实心锥喷嘴和螺旋喷嘴作对比,经过大量试验,系统地研究了旋流喷嘴的体积流量变化规律,得到旋流喷嘴体积流量与压力的平方根近似呈线性关系;在一定范围内改变喷孔直径,不会影响旋流喷嘴的流量-压力特性;几何相似时,增加喷孔直径,最大体积流量增加;相同压力下,螺旋喷嘴流量最大,旋流喷嘴次之,实心锥喷嘴最小。建立了旋流喷嘴的数学模型,采用Fluent对喷嘴内部流动和体积流量进行了数值模拟,给出了喷嘴内部流动、中心断面压力分布特性和流量-压力特性曲线,数值计算结果与试验数据基本吻合。

Study on the rule of volume flow and numerical simulation of swirl nozzles used in wet FGD system

Nozzles with geometric similarity and different outlet diameters were developed based on the experimental research of swirl nozzles commonly used in wet FGD.The rule of volume flow of swirl nozzles was studied and compared with that of full cone nozzles and spiral nozzles.The results show that volume flow of swirl nozzle is linear with the square root of pressure;changing the diameter of nozzle within certain range has little effect on its flow-pressure characteristic;the maximum volume flow increases with the enlarged outlet for the nozzles with geometric similarity and so on.In addition,the mathematic model of swirl nozzles was established,and the volume flow was simulated numerically by means of Fluent.The flow inside nozzles,pressure distribution of center section and flow-pressure characteristic were presented.The result is almost consistent with the experimental data.