The flow field and coal combustion process in a pilot-scale iron ore pelletizing kiln is simulated using a computational fluid dynamics (CFD) model. The objective of the work is to investigate how the thermal effects from the flame affect the flow field. As expected, the combustion process with the resulting temperature rise and volume expansion leads to an increase of the velocity in the kiln. Apart from that, the overall flow field looks similar regardless of whether combustion is present or not. The flow field though affects the combustion process by controlling the mixing rates of fuel and air, governing the flame propagation. This shows the importance of correctly predicting the flow field in this type of kiln, with a large amount of process gas circulating, in order to optimize the combustion process. The results also justify the use of down-scaled, geometrically similar, water models to investigate kiln aerodynamics in general and mixing properties in particular. Even if the heat release from the flame is neglected, valuable conclusions regarding the flow field can still be drawn.

使用计算流体力学（CFD）模型对中试规模的铁矿石制粒窑中的流场和煤燃烧过程进行了模拟。这项工作的目的是研究火焰的热效应如何影响流场。不出所料，燃烧过程导致温度升高和体积膨胀，导致窑内速度增加。除此之外，不管是否存在燃烧，总流场看起来都相似。但是，流场通过控制燃料和空气的混合速率来控制燃烧过程，从而影响燃烧过程。这表明正确预测这种类型窑炉中的流场以及大量工艺气体循环的重要性，以优化燃烧过程。结果还证明了使用缩小的，几何形状相似的水模型来总体研究窑的空气动力学，尤其是研究混合性能。即使忽略了从火焰释放的热量，仍然可以得出有关流场的有价值的结论。