氯化钠粒径分布对钠焰法过滤效率的影响  

Relationship between NaCl aerosol size distribution and testing efficiency for the sodium flame method

作　　者：张振中[1] 江锋[1] 叶璲生[1] 陈亮[1] 尉继英[1] 范桂芳[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第3期399-401,406,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50608044)

摘　　要：钠焰法是一种重要的高效滤料效率检测方法,发生氯化钠气溶胶的粒径分布是检测方法中重要的技术指标之一。该文采用5种粒径分布的NaCl气溶胶对3种滤料在3种滤速下进行效率测试,研究了氯化钠粒径分布对滤料效率结果的影响。实验结果表明,氯化钠气溶胶的粒径分布对于钠焰法过滤效率的最终测试结果有影响,其影响大于滤料制造本身引起的误差;使用计数中值直径(CMD)为(0.09±0.02)μm以及几何标准偏差(GSD)<1.78的氯化钠气溶胶进行滤料的钠焰法效率检测,其粒径分布将不会影响滤料等级的评价。The sodium flame method is one of the most important methods for HEPA media filtration efficiency measurements with the size distribution of the NaCl particles being a key parameter. The testing efficiencies of three filter media were tested with three filter velocities of 5 NaCl size distributions to analyze the relationship between the NaCl size distribution and the testing efficiency. Experimental results show that the filtration efficiency is more strongly related to the NaCl particles size distribution than filter media. For NaCl particles having a count median diameter （CMD） of （0. 09 ± 0.02） μm and a geometric standard deviation （GSD） of less than 1.78, the efficiency differences due to the size variation will not affect the filter media evaluations.

关 键 词：钠焰法 滤料 效率测量 粒径分布 

分 类 号：TU834.81[建筑科学—供热、供燃气、通风及空调工程] TU834.86