卧式自清洗网式过滤器排污时间试验及计算

Experiment and calculation of discharge time for horizontal type self-cleaning screen filter

通过对型号为8GWZ-200的卧式自清洗过滤器排污时间进行试验，获得了4种流量（220，200，180，160m^3／h）、6种含沙量（0．006，0．013，0．015，0．018，0．027，0．063kg／m^3）这2种条件下排污口含沙量随排污时间变化的试验结果．分别分析了相同流量不同含沙量以及相同含沙量不同流量条件下，排污口含沙量随排污时间的变化规律，结果表明：排污口含沙量均随排污时间先增大后减小，最后趋于稳定，进而得到排污时间的最小值应为14S．根据质量守恒建立了排污时间的计算方法，并根据试验结果，对排污时间进行了计算，结果表明：计算得到的过滤器排污时间为15～478．结合排污时间试验结果，最终确定卧式自清洗过滤器排污时间为15～30s．该结果与已有过滤器试验结果和实际工程运行结果均一致，完全可以用于实际工程中卧式自清洗网式过滤器排污时间的确定．

Through the experiment of discharge time of horizontal type self-cleaning screen filter, the relationships between sediment content at outlet and discharge time were obtained, with six different sediment content of inlet, which are S = 0. 006,0. 013,0. 015,0. 018,0. 027,0. 063 kg/m3 , and four different flow rates, which are Q = 220,200,180,160 m3/h. The changes of sediment content at outlet with discharge time are analyzed respectively such as different sediment content at same flow rate, and same sediment content at different flow rate. The results show that the sediment content at outlet rise to the maximum first,then decrease until reaching a steady value. Therefore, the minimum of discharge time is 14 s. According to the law of conservation of mass, the calculation me-thod of discharge time is also established. Based on the experimental results, the discharge time of filter is calculated, and the value of calculted discharge time is 15 - 47 s. Combined experimental results of discharge time, the value of discharge time for horizontal type self-cleaning screen filter is determined, which is 15 - 30 s. The results are consistent with the existing filter test results and actual operating results, which can be used to predict discharge time for practical engineering horizontal serf-cleaning screen filter.