高效空气过滤器滤速限值确定原则探究
Discussion on principles of determining medium velocity limits of HEPA filters
摘要：
通过比较不同体系中近期文献和相同体系中不同时期文献所给出的高效空气过滤器平均滤速限值，发现ASME AG-1-2019和GB/T 17939—2015标准的要求过于保守，而有些文献则放宽了相应要求或用其他要求替换。鉴于滤芯褶结构和平均滤速参数会明显影响过滤器气流分布均匀性和初阻力，建议在综合阻力最优滤芯褶结构基础上，按照同时满足高效空气过滤器的局部最大滤速不超过滤料单体可接受透过率的允许滤速、过滤器最大通流能力不超过期望初阻力所允许通流能力的原则确定平均滤速限值。
Abstract：
By comparing the average medium velocity limits of HEPA filters in the literatures of the different technology systems at present and the same technology system at past and present, finds that the requirements of ASME AG-1-2019 and GB/T 17939-2015 are too conservative and some literatures relax the corresponding requirements or replace them with other requirements. Considering that the medium pleated configuration of filter pack and the average medium velocity have significant influences on the uniformity of airflow distribution and the initial resistance of the HEPA filters, suggests that the average medium velocity limit should be determined according to the principles of the maximum local medium velocity of the HEPA filter not exceeding the allowable medium velocity under the acceptable penetration rate of the filter medium and the maximum flow capacity of the filter not exceeding the allowable flow capacity under the expected initial resistance, on the basis of the medium pleated configuration of filter pack with optimal comprehensive resistance.
Keywords:high efficiency particulate air filter, filter pack, pleated configuration, medium velocity, penetration rate, resistance