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Thermal Behavior of Coal Used in Rotary Kiln and Its Combustion Intensification

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
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Energies 2018, 11(5), 1055; https://doi.org/10.3390/en11051055
Received: 7 April 2018 / Revised: 16 April 2018 / Accepted: 20 April 2018 / Published: 25 April 2018
(This article belongs to the Section Energy Sources)
Pyrolysis and combustion behaviors of three coals (A, B, and C coals) were investigated and their combustion kinetics were calculated by the Freeman–Carroll method to obtain quantitative insight into their combustion behaviors. Moreover, the effects of coal size, air flow, oxygen content, and heating rate on coal combustion behaviors were analyzed. Results showed that the three coals have a similar trend of pyrolysis that occurs at about 670 K and this process continuously proceeds along with their combustion. Combustion characteristics and kinetic parameters can be applied to analyze coal combustion behaviors. Three coals having combustion characteristics of suitable ignition temperature (745–761 K), DTGmax (14.20–15.72%/min), and burnout time (7.45–8.10 min) were analyzed in a rotary kiln. Combustion kinetic parameters provide quantitative insights into coal combustion behavior. The suitable particle size for coal combustion in a kiln is that the content of less than 74 μm is 60% to 80%. Low activation energy and reaction order make coal, especially C coal, have a simple combustion mechanism, great reactivity, be easily ignited, and a low peak temperature in the combustion state. Oxygen-enrichment and high heating rates enhance coal combustion, increasing combustion intensity and peak value, thus shortening burnout time. View Full-Text
Keywords: thermal behavior; coal; rotary kiln; thermogravimetric analysis; combustion intensification thermal behavior; coal; rotary kiln; thermogravimetric analysis; combustion intensification
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MDPI and ACS Style

Zhong, Q.; Zhang, J.; Yang, Y.; Li, Q.; Xu, B.; Jiang, T. Thermal Behavior of Coal Used in Rotary Kiln and Its Combustion Intensification. Energies 2018, 11, 1055.

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