The propagation and ignition of the finely dispersed coal-water aerosol

• Published in: Fuel (Guildford) Vol. 263; p. 116767
• Main Authors: Egorov, Roman I., Tkachenko, Pavel P., Taburchinov, Roman I., Chulkov, Arseniy O.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-03-2020; Elsevier BV
• Subjects: Aerosol; Aerosols; Coal-water slurry; Deceleration; Evaporation; Ignition; Ignition simulation; Low temperature; Nozzles; Propagation; Size distribution; Slurries; Space flight; Velocity distribution; Size distribution; Ignition simulation; Propagation; Aerosol; Coal-water slurry; Velocity distribution; Evaporation
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2019.116767

[Display omitted]
•Effect of propagation on the sizes and velocities of fine CWS aerosol was observed.•Most probable size is growing with distance from 120 μm to 270 μm.•Such fine aerosol can ignite within 1 s of heating begin.•The CWS particles of 200–300 μm size can produce heat effectively.
Transformation of the fine aerosol of coal-water slurry during the propagation in air was investigated experimentally. It was shown that most probable size of aerosol particles changes from 120μm to 270-280μm during the free space flight for 0.4 m together with deceleration from 800 mm/s to 550 mm/s. The low temperature ignition of such aerosol on the discussed propagation way was analysed using the simulation. It was shown that particles with sizes 50-200μm ignite inside the observed range of distances from the nozzle. The particles bigger than 50μm allows high enough heat production within the 1–1.5 m of the flight and, thus, the observed fine aerosol is fully appropriate for industrial purposes.