Critical Condition for the Mass Burning Rate Constant of a Carbon Particle Activated; Comparisons with Experimental Results

Volume 5, Issue 2, April 2020     |     PP. 32-59      |     PDF (2040 K)    |     Pub. Date: October 12, 2020
DOI:    182 Downloads     5920 Views  

Author(s)

Atsushi Makino, Department of Mechanical Engineering, Faculty of Engineering, Aichi Institute of Technology, Toyota, Aichi, Japan

Abstract
Relevant to the activation of solid fuel particles, critical condition for the mass burning rate constant, above which particle combustion can successfully be accomplished has been obtained. Use has been made of the asymptotics, with focusing on the temporal variation of the particle temperature in the plateau stage. It has been confirmed that there exists a useful parameter, consisting of particle diameter and combustion rate, which mainly depends on the ambient temperature. It is seen that the critical condition separates regions, upper half of which corresponds to that for particle combustion with surface reactions activated. In addition, existence of the cut-off temperature, with respect to the ambient temperature, has been confirmed, above which the particle combustion can only be accomplished. Appropriateness and/or usefulness of this critical condition has further been examined, by use of such experimental data in the literature as are reported to burn in the quiescent environment. Experimental data used are those from semi-anthracite to low-rank coal char, as well as petroleum coke. A fair degree of agreement has been demonstrated, indicating that excessively smaller particles are unfavorable to the particle combustion. This fair agreement further suggests that the formulation, from which the critical condition has been derived, has captured the essential feature of the particle combustion that has not been elucidated. It has been confirmed again that the reduction in particle size does not necessarily favor the particle combustion, which is inconsistent with the premise prevailed.

Keywords
heterogeneous combustion; char combustion; critical condition for particle activation; particle size; mass burning rate constant; cut-off temperature.

Cite this paper
Atsushi Makino, Critical Condition for the Mass Burning Rate Constant of a Carbon Particle Activated; Comparisons with Experimental Results , SCIREA Journal of Energy. Volume 5, Issue 2, April 2020 | PP. 32-59.

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