对喷流除尘技术在收集硫酸铵和硝酸铵粉尘中的应用研究

Application of impinging stream to collecting ammonia sulfate and ammonium nitrate dust particles

对喷流除尘技术利用粉尘颗粒在撞击区内来回振荡、相互碰撞并团聚的机理进行除尘。实验采用水平式对喷流除尘系统收集硫酸铵和硝酸铵的混合物粉尘,主要考察喷嘴气流速度、含尘浓度和喷雾化水润湿含尘气流对除尘效率的影响,并进行机理分析。实验表明,除尘效率随喷嘴风速的增大而升高,但喷嘴风速超过25～27m/s后,反而下降;除尘效率随含尘浓度的增加而升高,但含尘浓度超过0.45～0.55kg/m3后反而有所降低;喷雾化润湿含尘气流能显著提高除尘效率,最优耗水量为0.18～0.22kg/kg粉尘,超过该值后无显著变化。实验确定的最优除尘条件为:喷嘴速度25～27m/s、含尘浓度0.45～0.55kg/m3、耗水量0.18～0.22kg/kg粉尘,除尘效率最高可达96.8%。

The present paper aims to introduce its author＇s study on the application of the technology of dust collection in impinging stream to collecting dust particles oscillating in the impinging area hoping to enhance the chance of collision and removing efficiency, As a result, the author has developed a type of plane impinging stream dust collection system to collect the mixture dust particles of ammonium sulfate and ammonium nitrate in experiment. So far as we know, there are three main reasons that account for the efficiency of dust collection, that is, the flow velocity of the nozzle, the density of the dust particles in air flow and the wetting dusty air flow. Experiments have shown that the efficiency of dust collection increases when the velocity of nozzle flow first of all rises and then decreases when the velocity exceeds 25-27 m/s approximate. The efficiency increases as the density of dust particles in air flow goes up but decreases when the density of the dust particles in the air flow exceeds 0.45-0.55 kg/m^3 approximate. However, though wetting the air flow dust helps to increase the efficiency of dust collection, the collection efficiency has no significant changes when the water used exceeds 0.18-0.22 kg/kg approximate. Therefore, the experiment makes certain that the best dust collection condition areas can be shown as follows ： （ 1 ） The velocity of flow of nozzle is about 25-27 m/s; （2） The density of dust particles in the air flow is about 0.45-0.55 kg/m^3 ; and （3） The water used should be about 0. 18-0.22 kg/kg dust narticles,