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Ignition and Combustion of Isolated Coal Water Slurry Droplet FREE

[+] Author Affiliations
Tanmoy Bhadra, Kalyan Annamalai

Texas A & M University, College Station, TX

Paper No. 97-AA-079, pp. V001T13A055; 8 pages
doi:10.1115/97-AA-079
From:
  • ASME 1997 Turbo Asia Conference
  • ASME 1997 Turbo Asia Conference
  • Singapore, September 30–October 2, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7867-5
  • Copyright © 1997 by ASME

abstract

A digital image processing technique is used to investigate the ignition and combustion characteristics of an isolated coal water slurry droplet in low Re flow. Coal water slurry droplet study is useful for dilute coal suspensions based on the premise that ignitability of a spray of coal water slurry must depend on the ignition characteristic of an isolated coal water slurry droplet. A flat flame burner is used for optical accessibility and also for simulating vitiated gases as existing in boiler burners. A quartz wire of 0.175 mm dia is chosen for low thermal conductivity to hold the droplet above the flat flame burner. The following sequence of events are observed: (i) Ignition occurs at the leading edge of the droplet, (ii) For coal water slurry droplet of the order less than 1 mm ejection of volatiles as jets in the direction of convective flow followed by coalescence, (iii) For a droplet with diameter of the order greater than 1 mm it was observed that the volatile combustion occurs away from the droplet in the wake of the combustible gases made upstream, (iv) Combustion of coal water slurry droplet is intermittent. Ignition time and volatile combustion times were obtained for a typical coal water slurry droplet. Calculations were carried out to determine the number of particles, interparticle spacing and density of coal water slurry droplet.

Copyright © 1997 by ASME
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