气溶胶浓度及测试粒径对高效过滤器计数法检漏测试的影响
Effect of aerosol concentration and particle size on particle counting leak test of HEPA filters
摘要：
针对国内外标准规范对高效过滤器扫描检漏测试时限定的气溶胶浓度及测试粒径不同的问题，通过搭建计数法扫描检漏测试试验台，测试了不同上游气溶胶浓度、不同测试粒径条件下高效过滤器的局部透过率，分析了气溶胶浓度及测试粒径对高效过滤器检漏测试结果的影响。试验结果表明，当过滤器上游气溶胶浓度稳定时，其浓度和粒径对过滤效率影响不大。基于此给出了现场扫描检漏的一些建议。
Abstract：
Aiming at the problem of different recommendations on aerosol concentration and particle size for HEPA filter scanning leak test in different standards and codes at home and abroad, by establishing the particle counting scanning leak test bed, tests the local penetration ratio of HEPA filter under the conditions of different upstream aerosol concentration and particle size. Analyses the impact of aerosol concentration and particle size on HEPA filter leak testing results. Experimental results show that when the upstream aerosol concentration of the HEPA filter is stability, the concentration and the particle size have little effect on filtering efficiency. Gives some corresponding recommendations for in-site scanning leak test of HEPA filters.
Keywords:particlecounter,scanningleaktest,aerosol,HEPAfilter,mostpenetrateparticlesize(MPPS)