湿法脱硫旋流喷嘴雾化粒径空间分布规律

Atomized particle size spatial distribution of flue gas wet desulfurization swirl nozzle

应用于湿法脱硫的旋流喷嘴孔径较大,其雾化粒径在空间上存在一定分布规律,不同于其他领域。这个规律的存在直接影响该类喷嘴本体设计和脱硫塔雾化系统设计。试验利用马尔文激光粒径分析仪,对旋流喷嘴雾化粒径空间分布规律进行了系统研究,为便于分析定义了平均粒径(■)、粒径相对离差(SMDr)和单流量粒径分布平均范围(■)。试验结果表明,大孔径旋流喷嘴的雾化粒径和雾化粒径分布随流量和流出位置的不同均呈现一定的变化规律;各流量下,在与来流夹角90°处,粒径相对离差最大,Sauter平均粒径波动较大,粒径分布范围和粒径分布平均范围均最小,这说明该处分散度小,雾化均匀性好;平均粒径与压力呈幂函数关系;单流量粒径分布平均范围与压力呈线性关系。

The swirl nozzle aperture used in flue gas wet desulfurization is usually large. Its atomization particle size has a specific rule of distribution in space, which is different from other atomization applications. This rule directly affects the design of this kind of swirl nozzle and the atomization system in a desulfurization tower. Malvern laser particle size analyzer was used to study atomized particle size spatial distribution of the swirl nozzle. In order to analyze, the spatial distribution, the average particle size （^-SMD）, particle size relative deviation （SMDr） and average span of single flow particle size distribution （^-SPANf） were defined. The analysis result indicated that the atomization particle size and atomization particle size distribution of the large aperture swirl nozzle showed specific rules with different flow rates and outlet positions. At all flow rates, particle size relative deviation was the largest, Sauter average particle size fluctuated in a large range, span of particle size distribution and average span of particle size distribution was the smallest at 90° angle with incoming stream. This result showed that dispersion degree was small and atomization uniformity was good at 90° angle with incoming stream. The average particle size was in power function relation with pressure and the average span of single flow particle size distribution was linear with pressure.