Dispersion of three-component slurries after spraying with a pneumatic nozzle
D.V. Gvozdyakov1, A.V. Zenkov1, L.I. Maltsev2
1National Research Tomsk Polytechnic University, Tomsk, Russia
2Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: dispersion, coal-water slurry, pneumatic injector, gas-drop jet
Abstract
The characteristics of three-component slurry fuels, including coal, water and pyrogenetic liquid (a by-product of thermal processing of wood waste) have been experimentally studied, and the dispersion of the obtained slurries has been investigated as applied to the technology of their combustion in energy boilers. Samples of slurries for the study were obtained using a technology that includes coal mass grinding in a ball drum mill, metered mixing of components and processing of the resulting mixture on a rotary hydrodynamic cavitation generator, ensuring additional grinding of the coal mass, slurry homogenization, and mechanochemical activation of the fuel. The slurries were dispersed using a pneumatic injector with an external mixing of the slurry and the spraying agent. The average slurry droplet size in the jet after spraying was determined using the Interferometric Particle Imaging (IPI) method. The droplet velocity was recorded using Particle Image Velocimetry (PIV). The characteristics of the gas-liquid flow created by the nozzle have been obtained from the initial breakup of the liquid jet to the final state of the spray.
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