Prediction of high-temperature rapid combustion behaviour of woody biomass particles.
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Date
2016-02Author
Li, Jun
Paul, Manosh C.
Younger, Paul L.
Watson, Ian
Hossain, Mamdud
Welch, Stephen
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LI, J., PAUL, M. C., YOUNGER, P. L., WATSON, I., HOSSAIN, M. and WELCH, S., 2016. Prediction of high-temperature rapid combustion behaviour of woody biomass particles. Fuel, 165 (February 2016), pp. 205-214.
Abstract
Biomass energy is becoming a promising option to reduce CO2 emissions, due to its renewability and carbon
neutrality. Normally, biomass has high moisture and volatile contents, and thus its combustion behaviour
is significantly different from that of coal, resulting in difficulties for large percentage biomass cofiring
in coal-fired boilers. The biomass combustion behaviour at high temperatures and high heating
rates is evaluated based on an updated single particle combustion model, considering the particle size
changes and temperature gradients inside particle. And also the apparent kinetics determined by high
temperature and high heating rate tests is employed to predict accurate biomass devolatilization and
combustion performances. The time-scales of heating up, drying, devolatilization, and char oxidation
at varying temperatures, oxygen concentrations, and particle sizes are studied. In addition, the uncertainties
of swelling coefficient and heat fractions of volatile combustion absorbed by solid on the devolatilization
time and total combustion time are discussed. And the characterised devolatilization time and total
combustion time are finally employed to predict the biomass combustion behaviour. At the last, a biomass
combustion/co-firing approach is recommended to achieve a better combustion performance
towards large biomass substitution ratios in existing coal-fired boilers.