Abstract
An important task in the production of fine bulk material based on silica gel is to obtain a narrow fraction of the powder of the required dispersion. Existing devices, due to the required dispersion of bulk powder, technological and other parameters, do not always allow this to be done. The paper considers various classifiers. Their disadvantages for carrying out fractionation of bulk material based on silica gel at the Salavat Catalyst Plant are shown. The authors of the work proposed the design of a multi-vortex classifier for obtaining powder in size from 10 to 40 microns. The aim of this work is to obtain an experimental dependence of the hydraulic resistance of a simplified model of a multi-vortex classifier on the average velocity of the gas flow. 3 simplified models of the multi-vortex classifier are presented. The scheme of the experimental setup is presented. The method of conducting experiments is described. Based on the work carried out, the following conclusions were drawn. 1) Pressure losses in simplified models of a multi-vortex classifier range from 6 to 670.5 Pa at an input average gas flow velocity of 4.1 to 23.6 m/s. 2) The maximum hydraulic resistance corresponds to the first model with the largest number of local resistances - rectangular slots. 3) The equations of hydraulic resistance and coefficients of hydraulic resistance from the average velocity of the gas flow are obtained for 3 models of the multi-vortex classifier. 4) It is qualitatively obtained that there is a critical equivalent diameter of the inter-tube space, reflecting the beginning of the destruction of the vortex structure in the multi-vortex classifier. This factor leads to an increase in the hydraulic resistance of the device.
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