高湿低温环境下低浓度颗粒物采样滤膜试验研究

随着污染物超低排放控制技术日趋完善，当烟道内颗粒物浓度低、温度低、湿度高时，采用GB/T16157-1996中推荐的颗粒物测试方法（滤筒法），经常会出现样品失重，无法准确得到烟气中颗粒物排放浓度。目前，ISO、USAEPA、BS EN等国外标准以及中国拟制定的标准中均采用滤膜代替滤筒的采样称重方法，实现对低浓度颗粒物的测量。国内外滤膜种类繁多，选取了5种不同材质的滤膜（普通玻璃纤维膜，硼硅玻璃纤维膜，石英膜，聚四氟乙烯亲水膜和疏水膜）进行实验室对比试验研究，主要从滤膜采样平行样偏差、滤膜吸水性能、滤膜采样前后外观、滤膜空白样均值及滤膜自身特性等方面对滤膜性能进行评判，为选用适合高湿低温环境下的低浓度颗粒物采样滤膜提供参考。

Experimental Study on Sampling Filter Membrane for Low Concentration Particulate Matter under High-Humidity Low-Temperature Environment

With the control technology of ultra-low pollutants being gradually improved, in the case of low concentration of particulate matter in the flue with low temperature and high humidity, the particle testing method (i.e. filter cartridge method) recommended in GB/T16157-1996, will not be accurate enough to get the concentration of particulate matter in flue gas. At present, in both foreign standard such as ISO, USAEPA, BS EN and domestic standards, filter membrane is chosen instead of filter cartridge in sampling weighing method to achieve the measurement of low concentrations of particulate matter. Among the wide range of filters in China and abroad, five different types of filters (i.e. ordinary glass fiber membrane, borosilicate glass fiber membrane, quartz membrane, PTFE hydrophilic membrane and PTFE hydrophobic membrane) were selected for laboratory comparative test study. Mainly in the aspects of the filter Membrane sampling parallel sample deviation, water absorption performance of the membrane, the appearance of the membrane before and after sampling, the mean value of the membrane blank and the characteristics of the membrane itself, the performance of the membrane were evaluated so as to provide reference for the selection of sampling filter membrane for low concentrations of particulate matter under high humidity and low temperature environment.