Development of an air conditioning pre-filter suitable for volcanic regions

试制了两种空气滤清器，并对其性能进行了实验检测。首先，研制了基于惯性除尘原理设计的试验性过滤器。使用从樱岛周围几个地方收集的火山灰来检查火山灰收集系数。当风速小于4m/S时，有槽除尘器的总除灰系数为70%~90%，无槽除尘器的总除灰系数为65%~85%，当风速为3m/S时，灰径0~75、75~125、125~250、250~500时的部分除灰系数分别为22%、75%、98%和100%，验证了由部分除灰系数合成的总除灰系数与实测值相近。接下来，对湿式灰渣过滤器的效率进行了考察。该过滤器的集灰系数大于97%。然而，由于湿灰渣逐渐粘在喷水除尘器上，最终需要进行维护，建议仅在灰尘影响显著的限制区域使用。

Two kinds of trial air filters are producted and the performances of them are experimentally examined. First, trial filters, designed on the theory of inertial dust collection, are produced. Ash collection coefficients are examined using volcanic ash collected from several places around Sakurajima. The overall ash collection coefficients are between 70% to 90% for eliminators with grooves, 65% to 85% for eliminators without grooves, when the air velocity is less than 4m/s. The partial ash collection coefficients, corresponding to the ash diameter regions 0-75,75-125,125-250,250-500 are 22%, 75%, 98% and 100%, respectively, when the air velocity is 3m/s. It is verified that the overall ash collection coefficients synthesized from the partial collection coefficients are similar to those measurements. Next, the efficiency of a wet type ash filter is examined. The ash collection coefficient by this filter is more than 97%. However, as wet ash gradually sticks on the eliminator with water spraying, which will eventually require the maintenance, it can only be recommended to use in the restricted area where the influence of ash is remarkable.