新型翻板网式过滤器排污性能试验研究

Experimental Study on Blowdown Performance of New Type of Rotatable Plate Screen Filter

网式过滤器排污性能决定着过滤器排污过程的耗水量以及下一个工作周期的工作效率,对网式过滤器的排污性能分析,发现排污流量和进水含沙量是其重要的影响因素。为探究网式过滤器的排污效果,本次试验重点展开一种新型翻板网式过滤器的排污洁净度、排污时间、排污流量和进水含沙量等关系的探究,结果表明:在最佳预设压差下,排污流量是翻板网式过滤器的核心影响因素,随着排污流量增加,排污时间减少,排污洁净度增大,排污效果显著。同时,根据质量守恒定律,建立了排污时间与排污流量以及排污洁净度与排污流量的数学模型,根据试验结果进行计算,结果表明:拟合计算结果与试验结果的拟合相关系数r可达到0.98以上。为保证过滤器在低排污耗水量情况下达到高效排污效果,建议实际工作将排污流量设为180 m^3/h,排污时间为50 s,可使排污洁净度达到98%。

The discharge performance of the screen filter determines the water consumption in the discharge process of the filter and the working efficiency in the next work cycle. Based on the analysis of the discharge performance of the screen filter, it is found that the sewage discharge flow and the sediment content of the inlet water are the important influencing factors. For exploring screen filter drainage effect, the focus of the experiment was on the relationship of sewage discharge cleanliness, sewage discharge time, sewage discharge flow and sediment content of a new type of rotatable plate screen filter.The results show that: the best default under differential pressure and sewage discharge flow is the core of the rotatable plate net filter factors, with the increase of sewage discharge flow, sewage discharge time reduces, sewage discharge cleanliness increases, blow down effect is remarkable. At the same time, according to the law of mass conservation, the mathematical models of sewage discharge time and sewage discharge flow, sewage discharge cleanliness and sewage discharge flow were established. According to the test results, the results show that the fitting correlation coefficient r between the calculated results and the test results can reach above 0.98.In order to ensure that the filter can achieve high efficiency in the case of low discharge water consumption, it is recommended to set the sewage discharge flow as 180 m^3/h and the sewage discharge time as 50 s in actual work to achieve 98% of the sewage discharge cleanliness.