颗粒层非稳态过滤捕集效率的研究

为计算颗粒层非稳态过滤效率，通过改进经典过滤理论模型，考虑颗粒在过滤介质中的沉积，理论推导得出非稳态过滤效率的计算公式，而经典颗粒层过滤效率计算公式仅为此计算公式的特例。因为理论计算公式是隐函数，不便于工程实际应用，所以，在常温条件下，对非稳态过滤时的过滤时间、过滤风速、过滤层厚度、粉尘浓度和颗粒层滤料均粒径等五个因素进行了正交实验研究。采用多元回归的方法得出各影响因素与过滤效率呈显性关系的效率关联计算公式，其计算结果与实验测试结果基本吻合。

Study on collecting efficiency of granular bed filter in non-stationary

In order to calculate collecting efficiency of granular bed filter, the calculating formula of collecting efficiency of non-stationary was obtained by improving classic filtration model and considering particles deposited in filtration media,and filtration efficiency formula of classic theory is special case of this paper formula.Theory calculation formula was conceal function, which could not been used in engineering easily, so that orthogonal experimental test was made by fives factors, which were filtration time, filtration velocity, thickness of granular bed, dust concentration and diameter of particles. The dominance formula of filtration efficiency relationship with its influence factors was obtained; the basic accordant result was obtained by result of formula calculation comparing with the result of experimental test.