改善V型滤池跑砂的工程装置设计研究与实践

Design and Practice of an Engineering Device for Improving Sand Loss in V-type Filters

通过模型滤柱实验,研究滤料气水反冲洗过程中滤料流失量G与气冲强度L、水冲强度M和排水槽高度H之间的定量关系,由此确定设计参数设计出一种改善滤池跑砂的装置,并安装在V型滤池排水槽的两侧。生产实践应用结果表明,该装置能够起到改善V型滤池跑砂的效果,单次滤料流失量的减少率最高可达35.1%。按照定量关系确定的理论排水槽高度进行装置安装,不仅可以有效改善跑砂效果,反冲洗过程中的排水浊度也最低,反冲洗末期达到冲洗效果的时间也最短。通过经济性评估,该装置投资较省,安装简单,不需要停水施工,对生产无影响,对V型滤池具有普遍适用性。

The quantitative relationship between the filter medium loss G and the air flushing strength L,the water flushing strength M and the drainage tank height H in the process of gas/water backwashing of filter media was explored through using model filter column test.Based on this,the design parameters were determined and a device for improving sand loss in the V-type filter was designed,which was installed on both sides of the drainage tank of the V-type filter.The actual application showed that the device could improve the sand loss of the V-type filter,and the reduction rate of sand loss reached 35.1%.The installation of the device according to the theoretical drainage tank height determined by the quantitative relationship not only effectively controlled the sand loss,but also had the lowest effluent turbidity in the backwashing process and the shortest time to achieve the flushing performance at the end of backwashing.The economic evaluation showed that the device had the advantages of low investment,simple installation,on-line construction,no impact on production and universal applicability to V-type filters.