高精度气体水雾含量测量方法的研究

Study on High Precision Method of the Measurement of Mist Content in Gas

研究了一种快速高精度测量气体中水雾含量的方法。当含有水雾的气体通过装有玻璃纤维的采样管时，多种过滤机制使水雾沉降到玻璃纤维表面，通过称量玻璃纤维滤筒的重量差，可计算出气体的水雾含量。分析结果表明：当玻璃纤维直径为5μm时，其过滤层对水雾的收集效率大于99％；采用高纯度的玻璃纤维，可以减小其在烘箱中的失重。当玻璃纤维纯度为99．5％时，经7h加热后，失重小于0．1mg；玻璃纤维床层阻力和收集效率随液滴平均粒径增大而增加，对于平均粒径为1μm的水雾粒子，其收集效率大于99．5％。玻璃纤维过滤法比吸附法和光学法测量精度高，重复性和稳定性好，且测量结果不受环境和气体温度的影响。

To study a fast method on measuring mist content in gas with high accuracy. Mist in gas is intercepted by the fibreglass when the gas flows through the sampling tube filled with fibreglass. Mist content in gas can be ealeulated on condition that volume of gas flowing through the sampling pipe at unit time is measured. Results of calculation and experiment show that collected efficiency should be more than 99% if fibreglass diameter is at 5 μm. Purity of the fibreglass has great influence on its stability. For the fibreglass with a purity of 99. 5 %, weight loss is 0. 1 mg for seven hours in the oven. The bed pressure drop and collected efficiency increase with the average droplet diameter. Collection efficiency is more than 99. 5% if average droplet diameter is 1 μm. It can be seen from the comparison experiment of filter method, absorption method and LDV method. Fibreglass filter method has high aecuraey, good repeatability and stability. The measuring results are not affected by ambient and gas temperature.