本文指出采用煤砂平均粒径确定快滤池复合滤料配比的方法不尽与试验相符,且缺乏理论依据,并指出除两种滤料的极限粒径关系之外,煤的最小粒径对复合滤料工作性能有重大影响。作者根据水动力学原理提出两种滤料的极限粒径的一般关系。对于无烟煤和石英砂复合滤料可采用两者的混合粒径比3.2,最小粒径比不小于1.5～2.0。 This paper points out that the method of using the average particle size of coal sand to determine the ratio of composite filter material in the fast filter tank is not consistent with the test, and lacks theoretical basis, and points out that in addition to the relationship between the extreme particle size of the two filter materials, the minimum coal particle size Has a significant impact on the performance of composite filter materials. Based on the principle of hydrodynamics, the authors put forward the general relationship of the limiting particle size of the two filter media. For anthracite coal and quartz sand composite filter material can be used for the mixing particle size ratio of 3.2, the minimum particle size ratio of not less than 1.5 to 2.0.