Dynamic Pressure Cross-flow Of Experimental And Theoretical Study Of Solid-liquid Separation Device

Based on the principle of cross-flow filtration of the solid-liquid separation devices compared with the static filtering devices have the advantages of broad application, "thinning" the cake and small space. This type of device has been widely used in all fields. In a certain range, for traditional cross—flow filter, the faster the rotator is, the double the filtrating speed will be. But the speed of rotator can't increase infinitely. Also, the high—speed rotator uses a lot of energy and it will cause special requirements during its producing. All this will cause a lot problems during its real—producing. So, there are many problems for improving the efficiency of this kind of filter, only increasing the speed of the rotator. However, these problems will be settled very well by using dynamic pressure principle. The theory is to making several cuneiform slots on the rotator of traditional cross—flow filter, allowing the rotator forms convergence space with canister's inside wall. When suspending liquid fill into the cuneiform convergence space, it will cause kinetic press and improve the efficiency of filtrating. In this way, both the efficiencies will be improved for the filer and the ability of cleansing the residue without increasing the speed of the rotator evidently. The theory is easy and producing conveniently.In this paper, the dynamic pressure of cross-flow solid-liquid separation theory has been researched. Dynamic pressure of cross-flow filtration mathematical model has been established. The dynamic pressure factor affecting the filter equation is accessed. Dynamic pressure on the cross-flow solid-liquid separation test device has been carried out in-depth research and analysis. By contrasting a variety of programmes, carefully chosing the parameter, the prototype of Solid-liquid separation device is manufactured not only satisfy the requirements of the test, but has rational structure and manufacturing costs are lower. By orthogonal test and comparison test, the effectiveness of dynamic-pressure is tested. The curve of dynamic pressure coefficient is acquired. From the analysis, the following results are obtained:1. Solid-liquid separation device rolls speed is not the sooner the better. The speed of filtration rates increase first and then by with the rolls speed increasing. The effect of dynamic pressure will increase with the speed and more evident. Speed of change will lead to centrifugal force, dynamic pressure, shear force, the annulus flow patterns and other factors change, the impact on the speed of filtering is complex.2. Annulus of the change will significantly affect the filtration rate. Under certain conditions (gap equivalent to more than 10 mm), the smaller the ring gap, the faster the filter, so the application should be used as small as possible in the ring gap.3. With the increasing concentration of Suspending liquid, filtering speed gradually decreased.4. Filter Media direct impact on the filtering effect. Filter media match to the Suspending liquid achieve the best results.Through the filter test of Kaolin suspension, the rotation speeds, the concentration of materials and the annulus gap of the impact of the filter are inspected. From further tests confirm the conclusions of the theoretical analysisIn this paper, some of the conclusions of the research provide a valuable reference on research and development of such devices.