Experimental Study on Disturbance of Dense Slurry by Dispersive Jet in Submerged Environment.

In order to study the effect of thickener nozzle efflux on thickening slurry, the disturbance performance of nozzle efflux on slurry was investigated based on laboratory tests (nozzle diameter reduction, pressure, nozzle distribution, high energy and low attenuation) and industrial tests (jet time, disturbance range and slurry concentration). The matching relationship between j et efflux and concentration was determined by calculating disturbance area, permeability and slurry noise factors. The CFD numerical model under the action of flow field is constructed, and the results are applied to practice. The results show that :1) Cone installation jet system can achieve the purpose of stripping plate slurry, and provide a method for obtaining stable underflow concentration; 2) The optimal time to start the jet system is 16 h after the thickening machine works in full load condition. The spatio-temporal response relationship between slurry bottom flow concentration and the disturbance system is demonstrated. The longitudinal disturbance duration is 20 min, 15 min and 9 min in stratification. 3) The "plum blossom" arrangement jet of the nozzle was studied to completely cover the plate area, and the maximum volume of the flow field of the adjacent nozzle was deduced. It was verified that when the number of each layer of the nozzle was 20,14,9,6, it was easy to form a curved section, which was conducive to the stripping of slurry in the whole area. 4)Using yield stress and viscosity evaluation indexes to investigate shear failure and compaction dehydration performance, which is conducive to achieving stable underflow concentration of thickener. [ABSTRACT FROM AUTHOR]