Numerical Study of Pulverized Coal MILD Combustion in a Self-Recuperative Furnace
Numerical Study of Pulverized Coal MILD Combustion in a Self-Recuperative Furnace
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DOI：
10.1021/acs.energyfuels.5b01644
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发表时间：
2015-10
期刊：
影响因子：
5.3
通讯作者：
Manabendra Saha;A. Chinnici;B. Dally;P. Medwell
中科院分区：
文献类型：
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作者：
Manabendra Saha;A. Chinnici;B. Dally;P. Medwell
在平行射流自回热式煤粉燃烧炉中，对煤粉在中等或强烈低氧稀释（MILD）燃烧条件下的燃烧进行了数值研究。在三维轴对称炉膛区域内，采用涡耗散概念模型求解了雷诺平均Navier-Stokes方程。本研究的主要目的是了解在温和燃烧条件下，挥发分模型对煤粉燃烧预测精度的影响。特别是，三个挥发分模型进行了分析：一个传统的单速率模型，一个两个竞争速率模型，和先进的化学渗滤挥发分（CPD）模型的基础上结构网络的煤与全球动力学机制。此外，一个新的简化的数值模型，澳大利亚黑煤和/或硬煤和优化的温和燃烧条件。最后，通过实例验证了模型的有效性。
A numerical study of pulverized coal combustion under Moderate or Intense Low oxygen Dilution (MILD) combustion conditions is presented in a parallel jet self-recuperative MILD combustion furnace. The Reynolds-Averaged Navier–Stokes equations, in a three-dimensional axisymmetric furnace domain, were solved using the Eddy Dissipation Concept model for the turbulence–chemistry interaction. The main aim of this study is to understand the influence of devolatilization models on the prediction accuracy of pulverized coal combustion under MILD combustion conditions. In particular, three devolatilization models are analyzed: a conventional single-rate model, a two-competing-rates model, and an advanced chemical percolation devolatilization (CPD) model based upon structural networks of the coal with a global kinetics mechanism. In addition, a new simplified numerical model is developed for Australian black and/or hard coal and optimized for the MILD combustion conditions. The modeling cases are validated with the...