高效过滤器容尘性能试验用人工尘与发尘方法探讨

Discussion on artificial dust and dust generation methods for dust-loading test of high efficiency particulate air filters

采用KCl气溶胶与多种人工尘对高效过滤器进行容尘实验,结果显示,气溶胶因难以在可接受的时间内完成容尘实验,并不适合用于高效过滤器容尘性能试验。分别采用ISO A2尘与气相法白炭黑粉末,通过喂尘器串联旋风分离器的发尘方法进行容尘实验,结果表明气相法白炭黑+旋风分离器的发尘方法能够发生较为接近高效过滤器实际使用场合的人工尘颗粒,使高效过滤器在较小的容尘量下获得较快的阻力增长速度,有效缩短了实验时长,且容尘实验中几乎不存在管道落灰现象。实验方法具备较好的可操作性,适合用于高效过滤器容尘性能试验。

HEPA filters are challenged with KCl aerosol and a variety of artificial dust.The results show that the aerosol is not suitable for the HEPA filter dust-loading test because the experiment is difficult to complete in the acceptable time.ISO A2 dust and fumed silica powder are used respectively to carry out the dust-loading experiment by the dust generation method of the cyclone separator in series with the dust feeder.The results show that the dust generation method of fumed silica plus cyclone separator can produce artificial dust particles that are closer to the actual use of HEPA filter,so that the filter can obtain a faster resistance growth rate under a smaller dust capacity.The experimental time is effectively shortened,and there is almost no dust fall in the dust-loading experiment.The experimental method has good operability and is suitable for dust-loading test of HEPA filters.