含沙水磁化处理减缓滴头堵塞机理研究

为探究含沙水磁化处理对悬浮泥沙在滴灌管网中沉降的影响,揭示含沙水磁化处理对滴头堵塞的减缓机理,以内镶贴片式迷宫流道滴头为研究对象,设置4种磁化强度(0、0.2、0.4、0.6 T)和4种粒径级配(0～0.100 mm、0.075～0.100 mm、0.038～0.075 mm、0～0.038 mm)的泥沙,泥沙质量浓度...

Mechanism of Magnetization Treatment of Sandy Water to Relieve Clogging of Dripper

In order to explore the influence of the magnetization treatment of sediment laden water on the settlement of suspended sediment in drip irrigation pipe network, and reveal the mechanism of mitigating the clogging of the dripper by the magnetization of sandy water, taking the inner patch type labyrinth flow channel dripper as the research object, four kinds of magnetization (0T, 0.2T, 0.4T, 0.6T) and four kinds of sediment particle size gradation (0~0.100mm, 0.075~0.100mm, 0.038~0.075mm and 0~0.038mm) sediment were set, the sediment mass concentration was 1.0g/L and 3.0g/L, short-period intermittent irrigation test and flocculation sedimentation test were carried out, and the capillary siltation was detected by MS2000 laser particle size analyzer, water quality tester and Ubbelohde viscometer. The mechanical composition of the sediment, the conductivity and the viscosity coefficient of the test muddy water were analyzed from multiple angles. The results showed that magnetization treatment significantly slowed down the downward trend of emitter flow and irrigation uniformity (p<0.01). When the content of fine sand (0~0.03mm) was high, magnetization treatment had the greatest effect on reducing emitter clogging. At the end of irrigation, the average relative flow rate and irrigation uniformity of the dripper were increased by 17.41% and 47.27% respectively compared with the unmagnetized treatment;magnetization treatment accelerated the flocculation and sedimentation rate of suspended sediment. The higher the content of fine sediment was, the greater the acceleration was, and the sedimentation was 2h. The turbidity of the back turbidity was reduced by 29.44% compared with the unmagnetized treatment;the clogging rate of the dripper in the front of the capillary was increased by an average of 17.71% after magnetization, and the median size of the sediment in the middle of the capillary was reduced by 11.49%. The magnetization treatment promoted the fineness of the capillary. The flocculation of the granular silt accelerated its settlement in the front of the capillary. When the magnetization intensity was 0.4T, the magnetization had the greatest influence on the clogging of the dripper and suspended sediment flocculation and sedimentation. It was recommended to use magnetization treatment measures (the magnetization intensity was 0.4T) when the Yellow River drip irrigation with high fine particle content was used, which can slow down the blockage and increase the service life of the capillary. It can also improve the growth quality of crops and flush the capillary regularly to reduce the risk of dripper clogging.