袋式除尘器喷吹管设计参数对喷吹气量影响的计算分析

针对袋式除尘器的脉冲喷吹气流量不均匀性问题,利用CFD数值模拟建立含有结构参数、运行参数的脉冲袋式除尘器的喷吹气流分布模型,通过正交试验法研究了喷吹压力P、喷口个数N、喷口口径D、喷嘴管长H、脉冲时间T和喷口间距L对脉冲喷吹气流量不均匀性σ的影响程度,并拟合得到了各参数与σ的关系式。在设计压力条件下修正喷口管径,获得较好的气流量分布;对修正后的均匀喷吹管,得到在不同喷吹压力下其气流量不均匀性的变化情况。

CALCULATION AND ANALYSIS FOR THE IMPACT OF THE INJECTION PIPE DESIGN PARAMETERS ON MASS FLOW RATE IN BAG FILTER

The CFD numerical simulation was used to establish an airflow distribution model in injection pipe of pulse-jet bag filter.The model contains structural parameters and operating parameters.These parameters include the injection pressure(P),the number of nozzle(N),nozzle diameter(D),nozzle length(H),pulse time(T) and nozzle spacing(L).Orthogonal test showed that these parameters had different levels of the effects on the unevenness of pulse jet airflow(σ),and the equation for σ calculations was got by fitting.Under design pressure,nozzle diameter was adjusted,resulting in better distribution of mass flow rate;the change in unevenness of airflow of injection pipe with adjusted diameter under different pressure was also calculated.