Combustion of Coal Dust-Air Mixtures (Flammability, Radiation, Volatile)

Coal dust flammability studies are essential in order to evaluate propagation limit concentrations and the fundamental burning velocity as a function of dust concentration. This work presents such data for Pittsburgh seam bituminous coal dust using a relatively large scale horizontal flammability apparatus, the Gravity Tumbler Flammability Tube (GTFT). The reported lean limit (based on propagating a steady-state constant pressure flame) was measured as 0.42 kg/m('3), a factor of two or three greater than that reported from the modified Hartmann bomb apparatus. A maximum steady-state flame speed was measured as 34 cm/sec, at a concentration of 0.9 kg/m('3), a value greater than that observed when studying similar dusts with held flame facilities. Consistent indirect evidence was observed to indicate a rich flammability limit of 1.5 kg/m('3), but this could not be conclusively proven with the GTFT facility.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Slezak, Scott Edward

• Engineering, Mechanical

Identifier

(UMI)AAI8422157

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/70120