DETERMINATION OF THE SEPARATION EFFICIENCY OF AEROSOL SYSTEMS IN APPARATUSES WITH COMBINED NOZZLES
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Kazan National Research Technological University
2.
KGEU
Type:
Article
Pages:
from 94
to 100
Status:
Published
Received:
11.11.2025
Accepted:
08.04.2026
Published:
05.05.2026
Language:
Russian
Keywords:
MATHEMATICAL MODEL, SEPARATION, PACKED APPARATUSES, TURBULENT MIGRATION, MODERNIZATION
Abstract:
To solve the problems of designing or upgrading packed scrubbers for cleaning gases from a fine-grained phase, i.e., separating aerosol systems, the application of a one-dimensional differential equation of mass transfer and particle deposition with a volumetric source and an effective diffusion coefficient in the core of the flow is considered. To determine the effective diffusion coefficient, the D. Taylor model is used, where the main parameter is the dynamic velocity, which is expressed through the average volumetric rate of dissipation of the kinetic energy of the gas flow in the volume of the packed layer. The dissipation of gas energy is related to the hydraulic resistance of the packed apparatus. Expressions are given for calculating the dynamic speed in dry and irrigated nozzles. Using the Taylor model, an expression is obtained for calculating the effective diffusion coefficient in the gas phase under turbulent conditions in the packed bed, and a modified Peclet number is obtained in dimensionless form. The obtained expression for the Peclet number is related to the dynamic velocity and the gas velocity in the packed bed. The results of calculating the Peclet number and comparing them with known experimental data are presented. The semi-empirical expression by V.P. Mednikov is used to determine the rate of turbulent migration and deposition of particles in gases. Based on the application of the developed mathematical model, calculations were performed and technical solutions were provided for the modernization of the pyrogas scrubber for the removal of the dispersed phase (coke and resins) using a combination of random and regular nozzles. The industrial implementation of the nozzles demonstrated effective pyrogas cleaning in accordance with the technological regulations at the Ethylene plant.
To solve the problems of designing or upgrading packed scrubbers for cleaning gases from a fine-grained phase, i.e., separating aerosol systems, the application of a one-dimensional differential equation of mass transfer and particle deposition with a volumetric source and an effective diffusion coefficient in the core of the flow is considered. To determine the effective diffusion coefficient, the D. Taylor model is used, where the main parameter is the dynamic velocity, which is expressed through the average volumetric rate of dissipation of the kinetic energy of the gas flow in the volume of the packed layer. The dissipation of gas energy is related to the hydraulic resistance of the packed apparatus. Expressions are given for calculating the dynamic speed in dry and irrigated nozzles. Using the Taylor model, an expression is obtained for calculating the effective diffusion coefficient in the gas phase under turbulent conditions in the packed bed, and a modified Peclet number is obtained in dimensionless form. The obtained expression for the Peclet number is related to the dynamic velocity and the gas velocity in the packed bed. The results of calculating the Peclet number and comparing them with known experimental data are presented. The semi-empirical expression by V.P. Mednikov is used to determine the rate of turbulent migration and deposition of particles in gases. Based on the application of the developed mathematical model, calculations were performed and technical solutions were provided for the modernization of the pyrogas scrubber for the removal of the dispersed phase (coke and resins) using a combination of random and regular nozzles. The industrial implementation of the nozzles demonstrated effective pyrogas cleaning in accordance with the technological regulations at the Ethylene plant.
Keywords:
MATHEMATICAL MODEL, SEPARATION, PACKED APPARATUSES, TURBULENT MIGRATION, MODERNIZATION
MATHEMATICAL MODEL, SEPARATION, PACKED APPARATUSES, TURBULENT MIGRATION, MODERNIZATION
