Experimental and modeling study of single coal particle combustion in O2/N2 and Oxy-fuel (O2/CO2) atmospheres
Experimental and modeling study of single coal particle combustion in O2/N2 and Oxy-fuel (O2/CO2) atmospheres
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DOI：
10.1016/j.combustflame.2013.06.002
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发表时间：
2013-11-01
影响因子：
4.4
通讯作者：
Levendis, Yiannis A.
中科院分区：
文献类型：
--
作者：
Maffei, Tiziano;Khatami, Reza;Levendis, Yiannis A.
煤颗粒燃烧实验在氧浓度为21%~ 100%的落管式炉（DTF）中进行，在N2和CO2的混合物中，在静态流动条件下。分析了高挥发性烟煤（PSOC-1451）和褐煤（德克斯-11）的小颗粒（75-90 μ m），特别注意颗粒燃尽时间和颗粒表面温度。这些实验测量与煤燃烧的综合模型的预测进行了比较。煤颗粒燃烧是一个多尺度的过程，涉及到化学和物理现象，因此它需要耦合和准确的动力学描述以及热量和质量传输现象。该模型的重要特点是一个多步骤的动力学计划的煤挥发和详细的连续气相反应和焦炭氧化和气化的非均相反应的动力学。在颗粒温度和燃尽时间方面，实验数据和数值预测之间实现的总体一致性突出了该模型模拟煤燃烧过程中不同操作条件的影响的能力。(C)2013燃烧研究所爱思唯尔公司出版All rights reserved.
Coal particle combustion experiments were performed in a drop tube furnace (DTF) with oxygen concentration from 21% to 100%, in N-2 and CO2 mixtures, under quiescent flow conditions. Small particles (75-90 pm) of a high-volatile bituminous coal (PSOC-1451) and a lignite coal (DECS-11) are analyzed with particular attention to the particle burnout times and the particle surface temperatures. These experimental measurements are compared with the predictions of a comprehensive model of coal combustion. Combustion of coal particles is a multi-scale process where both chemical and physical phenomena are involved, thus it requires a coupled and accurate description of the kinetics as well as of the heat and mass transport phenomena. Important features of the model are a multistep kinetic scheme of coal volatilization and detailed kinetics of the successive gas-phase reactions and of the heterogeneous reactions of both char oxidation and gasification. The achieved overall agreement between the experimental data and the numerical predictions, in terms of particle temperature and burnout times, highlights the capability of the model to simulate the effect of different operating conditions in the coal combustion processes. (C) 2013 The Combustion Institute. Published by Elsevier Inc. All rights reserved.