Char burning kinetics from imaging pyrometry: Particle shape effects
Char burning kinetics from imaging pyrometry: Particle shape effects
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DOI：
10.1016/j.fuel.2014.05.049
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发表时间：
2014-10
期刊：
影响因子：
7.4
通讯作者：
M. Schiemann;S. Haarmann;N. Vorobiev
中科院分区：
文献类型：
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作者：
M. Schiemann;S. Haarmann;N. Vorobiev
生物质燃烧在当今的能源生产中变得越来越重要。生物质和煤炭之间的主要区别之一是颗粒形状。因此，当通过高温测量确定粉状燃料颗粒的炭燃烧动力学时，计算颗粒形状变化的影响以确定球形或圆柱形颗粒形状的影响。经常用于焦炭动力学测定的模型适用于典型燃烧条件下的球形和圆柱形颗粒。针对典型颗粒尺寸和长径比，计算了颗粒形状对能量平衡的影响，这是确定动力学参数所需的。计算表明，对于通过高温测量确定生物质炭燃烧参数而言，颗粒形状效应的影响不可忽略。适应模型在测量数据上的应用表明，颗粒形状效应可以通过高温测量技术来解决。结果表明，颗粒燃烧速率的合理分析应包括三维颗粒形状测量。
Biomass combustion becomes increasingly important in nowadays energy production. One of the major differences between biomass and coal is the particle shape. Therefore the effect of particle shape variations was calculated to determine the effect of spheroidal or cylindrical particle shapes when determining char burning kinetics of pulverized fuel particles from pyrometric measurements. A model frequently used for char kinetics determination was adapted to spheroidal and cylindrical particles under typical combustion conditions. The impact of the particle shape on the energy balance, which is needed for the determination of kinetics parameters, was calculated for typical particle sizes and length to diameter ratios. As the calculations show, the influence of particle shape effects is not negligible for the determination of biomass char burning parameters by pyrometric measurements. The application of the adapted model on measured data shows, that particle shape effects can be resolved by pyrometric techniques. The results presented indicate that a sound analysis of the particle burning rate should include a three-dimensional particle shape measurement.