滤袋数目对翼形上进风袋式除尘器内流场影响的数值模拟研究

针对实际运行过程中,袋式除尘器滤袋使用寿命短,压力损失过大的问题,本文以翼形上进风袋式除尘器为研究对象,采用CFD(computational fluid dynamics)技术模拟分析不同滤袋数(分别为92、88、84、80、76和72)时袋式除尘器内气流分布和压力损失规律。主要考察了流量分配系数、最大流量不均幅值、气流迹线、滤袋表面速度分布与压降等指标。结果表明,滤袋数为76个时,气流分布最为均匀,各滤袋负载均衡;相同过滤速度下,装置的压降随滤袋数目的增加而上升,即压降大小顺序为9288847672;与72个滤袋相比,76个滤袋的可用过滤面积更大。综合考虑,袋式除尘器的最优滤袋数目为76个。模拟结果为袋式除尘器的设计和优化提供了依据。

Numerical simulation of effect of bag number on flow field inside a wing upside-entrainment bag filter

To solve actual operation problems of short service life of filter bag and large pressure drop, the patterns of gas flow distribution and pressure drop at different numbers of bags (92, 88, 84, 80, 76 and 72,respectively) inside the wing upside-entrainment bag filter were investigated by using CFD technology. Flow distribution coefficient, maximum flow uneven amplitude, airflow pathline, surface velocity distribution and pressure drop were regarded as important indexes to study the pattern. The results showed that the flow distribution was most uniform and the pressure drop was acceptable in the case of 76 bags. Under the same filtration rate, the pressure drop increased with the increase of the number of bags, namely the turn of pressure drop was as follows 92>88>84>76>72. Furthermore, the effective filtration area of 76 bags was more than 72 bags. In the all, 76 bags was the optimal number of bag filter. The results could provide a guideline for the design and optimization of bag filter.