Crushing droplets of coal-water fuel under conditions of high-speed impact on a solid barrier

• Published in: International communications in heat and mass transfer Vol. 157; p. 107732
• Main Authors: Syrodoy, S.V., Kuznetsov, G.V., Nigay, N.A., Kostoreva, J.A., Zamaltdinov, R.R., Gutareva, N.Y., Akimov, V.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2024
• Subjects: Characteristic drop size; Collision; Distribution of secondary drops; Initial drops; Plate rotation speed; Splitting up; Water-coal fuel; Distribution of secondary drops; Initial drops; Characteristic drop size; Collision; Splitting up; Plate rotation speed; Water-coal fuel
• ISSN: 0735-1933
• DOI: 10.1016/j.icheatmasstransfer.2024.107732

Annotation. Currently, one of the problems significantly hindering the development and implementation of the water-coal technologies in the energy sector is the lack of reliable methods of spraying CWF to a finely dispersed state in the furnace space of the boiler units. The article provides a scientific justification for the new technology of spraying water-coal fuel. The results of the experimental studies of the processes of crushing single drops of water-coal fuel when the latter collide with a metal plate rotating at high angular velocity are presented. Based on the results of the experiments, the main modes of crushing fuel drops have been established depending on the impact velocity at the time of collision with an obstacle. Also, according to the results of the experiments, the distributions of the number of secondary drops of water-coal fuel in size depending on the collision velocity of the drop with an obstacle were established. The relationship between the efficiency of the crushing process and the impact velocity is shown. [Display omitted] •The technology of blade crushing of large droplets of WCF has significant prospects.•Two characteristic modes of crushing of CWF droplets have been established.•Under low-speed conditions, the fuel spreads over the blade in the form of a film.•Under conditions of high-speed impact, impact destruction of a CWF drop occurs.