Experimental and numerical studies of the processes of spraying coal-water slurries with pneumatic nozzle; Chemical Engineering Research and Design; Vol. 209

Experimental and numerical studies of the processes of spraying coal-water slurries with pneumatic nozzle

Bibliographic Details
Parent link:Chemical Engineering Research and Design.— .— United Kingdom: IChemE
Vol. 209.— 2024.— P. 167-177
Other Authors: Gvozdyakov D. V. Dmitry Vasilievich, Zenkov A. V. Andrey Viktorovich, Kondakov A. A. Aleksandr Aleksandrovich, Maltsev L. I. Leonid Ivanovich, Podzharov Yu. S. Yury Sergeevich
Summary:Title screen
The article presents the results of spraying tests of highly viscous coal-water slurries with a pneumatic nozzle and numerical studies of the structure of the gas-drop jet. An increase in the viscosity of coal-water slurries was ensured by introducing a third component into its composition – industrial waste (pyrogenetic liquid). The moderate effect of the slurry viscosity on the average droplet size of coal-water slurries in the jet is due to the high efficiency of the aerodynamic characteristics of the pneumatic nozzle. Introduction of pyrogenetic liquid in the amount of 20 % by weight into the composition of coal-water slurry significantly increases its viscosity. The value of the surface tension of such a slurry is more than doubled. The increase in the average droplet size was no more than 25 % when pyrogenetic liquid content in the composition of coal-water slurry was over 10 % by weight. The average droplet size of coal-water slurries varied in the range from 180 to 210 microns in the study area of gas droplet jet. The results of experimental and numerical studies have shown good convergence. High air velocities at short distances from the nozzle ensure high crushing efficiency of the jet of coal-water slurry. The breakdown of the boundary layer of the liquid from the periphery of the droplets of coal-water slurries and its subsequent destruction was observed at short distances from the nozzle. The values of the Weber number were 100<We<350. At considerable distances from the nozzle (more than 0.5 m), droplets of coal-water slurries were subjected to vibrational crushing (We<50)
Текстовый файл
AM_Agreement
Language:English
Published: 2024
Subjects:
электронный ресурс
труды учёных ТПУ
Coal-water slurry
Viscosity
Surface tension
Numerical modeling
Gas droplet jet
Online Access:https://doi.org/10.1016/j.cherd.2024.07.054
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=679568

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