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Devolatilization wave structures and temperatures for the pyrolysis of polymethylmethacrylate, ammonium perchlorate, and coal at combustion level heat fluxes.
Combust Flame 1991 Mar; 84(1-2):15-37
Data are presented for the surface pyrolysis temperatures, ts, and for the devolatilization mass loss rate per unit area, m, for polymethylmethacrylate (pmma) exposed to a laser beam at incident flux levels of 15 to 500 w/cm2. After a brief induction time during which the surface is being heated to ts, the measured m values are thereafter steady state in time, and are linearly related to the net absorbed flux, iabs. The measured values for m are in good agreement with that derived from the first law of thermodynamics. Kinetically, this equation represents a devolatilization wave front whose propagation rate and maximum temperature are both heat- transport controlled, and determined by the magnitude of the driving flux, iabs. The available data for ammonium perchlorate and for coal are also shown to obey a similar relationship, and the same heat-transport-controlled process appears to govern their pyrolysis and devolatilization kinetics.
Temperature-effects; Thermal-effects; Thermodynamics; Thermodynamic-reactions; Coal-processing
OP; Journal Article
Issue of Publication
Combustion and Flame
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division