片烟加料外混式空气雾化喷嘴雾化粒径分布特性

Distribution characteristics of particle size of tobacco casing atomized by external-mixing air atomizing nozzle

为检测烟草加料工艺过程中料液雾化液滴粒径分布特性,利用两台高速相机、外混式空气雾化喷嘴激光平台试验装置以及Halcon图像处理软件,分析了料液流量、料液温度、喷嘴气压对外混式雾化喷嘴雾化粒径分布的影响,同时利用离散型均匀分布方法建立了雾化液滴粒径的均匀性分布函数,利用量纲分析法建立了索太尔平均直径(SMD)的试验数学模型。结果显示:①在其他条件不变时,随着检测区域变化,雾化液滴分布均匀性效果逐渐变佳,其中区域4雾化液滴分布均匀性统计量变化差异最大。②其他条件相同时,随着雾化气压力的增加,雾化液滴分布均匀性呈逐渐降低趋势。③其他条件相同时,雾化液滴分布均匀性随料液流量增加而逐渐增加;雾化液滴分布均匀性随料液温度增加先减小后增大。④其他条件相同时,随着料液温度、雾化气压力的增加,SMD值呈不规则变化;随着料液流量、雾化气压力的增加,SMD值呈先减小后增大趋势;随着料液流量、料液温度的增加,SMD值逐渐减小。

In order to investigate the particle size distribution of atomized casing solution and optimize tobacco casing in cigarette production, two high-speed cameras, an external-mixing air atomizing nozzle testing platform,and Halcon image processing software were used to analyze the influences of the flow rate and temperature of casing and the air pressure in nozzle on the particle size distribution of atomized casing. At the same time, the uniformity distribution function of atomized droplets’ diameters and the experimental mathematical model of Sauter mean diameter were established by discrete uniform distribution method and dimensional analysis method respectively. The results showed that keeping the other conditions unchanged, 1)the distribution uniformity of droplets promoted gradually as the testing area varied, and the biggest variation of distribution uniformity presented in area No.4 statistically;2)the distribution uniformity of droplets decreased gradually with the increase of air pressure in nozzle;3)the distribution uniformity of droplets increased gradually with the rise of casing flow rate, however, it decreased first and then increased with the rise of casing temperature;4)SMD value changed irregularly with the rise of casing temperature and air pressure, however, it reduced first and then rose with the increase of casing flow rate and air pressure, lowered gradually with the rise of temperature and flow rate of casing.