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Abstract <p>Currently, in the chemical, petrochemical, nuclear, and other industries, there is a growing need for fine powders of homogeneous fractional composition. In particular, the task is to obtain a finely dispersed bulk material based on silica gel with a grain size of less than 50 µm. This powder is used for drying and cleaning media that are prone to polymerization and decomposition, etc. To obtain it, it is necessary to carry out fractionation of bulk crushed material based on silica gel after milling. This problem is solved by classifiers, i.e., special separators designed to separate particles into classes by size. The paper presents the design of a developed multi-vortex classifier–separator for solving the problem of fractionation of bulk material based on silica gel with a boundary grain size of less than 50 µm. The principle of operation of the device is described. The aim of the work is a numerical study of the influence of the diameter of the holes in the classifier plate on efficiency at different input velocities of the gas flow. The research is carried out in the Ansys Fluent software product. During the studies, the diameter of the round holes is varied from 5.3 to 11 mm and the inlet velocity of the gas flow from 1 to 16 m/s. The results of numerical studies show that with the diameter of round holes made in the classifier–separator plate equal to 8 mm, a high fractionation efficiency of more than 70–95% is achieved for the size of the boundary grain of 20–50 µm at inlet gas flow velocities from 1 to 16 m/s. The fractionation efficiency and the size of the boundary grain are significantly affected by both the inlet velocity of the gas flow in a wide range from 1 to 16 m/s, and the diameter of the round holes at a certain value, i.e., 8 mm. With other sizes of round holes, the efficiency and size of the boundary grain remains practically unchanged. This is due to the chaotic movement of the circulating flows that destroy the transport channels. The conducted studies show that the use of the developed classifier–separator can become an alternative to many foreign analogues in solving the problem of fractionation of fine bulk material based on silica gel with a grain size of 20–50 µm.</p>

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Influence of the Diameters of the Holes in the Classifier–Separator Plate on Fractionation Efficiency of Fine Silica Gel

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • V. E. Zinurov

摘要

Abstract

Currently, in the chemical, petrochemical, nuclear, and other industries, there is a growing need for fine powders of homogeneous fractional composition. In particular, the task is to obtain a finely dispersed bulk material based on silica gel with a grain size of less than 50 µm. This powder is used for drying and cleaning media that are prone to polymerization and decomposition, etc. To obtain it, it is necessary to carry out fractionation of bulk crushed material based on silica gel after milling. This problem is solved by classifiers, i.e., special separators designed to separate particles into classes by size. The paper presents the design of a developed multi-vortex classifier–separator for solving the problem of fractionation of bulk material based on silica gel with a boundary grain size of less than 50 µm. The principle of operation of the device is described. The aim of the work is a numerical study of the influence of the diameter of the holes in the classifier plate on efficiency at different input velocities of the gas flow. The research is carried out in the Ansys Fluent software product. During the studies, the diameter of the round holes is varied from 5.3 to 11 mm and the inlet velocity of the gas flow from 1 to 16 m/s. The results of numerical studies show that with the diameter of round holes made in the classifier–separator plate equal to 8 mm, a high fractionation efficiency of more than 70–95% is achieved for the size of the boundary grain of 20–50 µm at inlet gas flow velocities from 1 to 16 m/s. The fractionation efficiency and the size of the boundary grain are significantly affected by both the inlet velocity of the gas flow in a wide range from 1 to 16 m/s, and the diameter of the round holes at a certain value, i.e., 8 mm. With other sizes of round holes, the efficiency and size of the boundary grain remains practically unchanged. This is due to the chaotic movement of the circulating flows that destroy the transport channels. The conducted studies show that the use of the developed classifier–separator can become an alternative to many foreign analogues in solving the problem of fractionation of fine bulk material based on silica gel with a grain size of 20–50 µm.