The Effects of Combustion Parameters on Pollutant Emissions in a Porous Burner
The Effects of Combustion Parameters on Pollutant Emissions in a Porous Burner
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DOI：
10.1260/1756-8277.6.2.147
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发表时间：
2014-06
影响因子：
1.6
通讯作者：
N. M. Khiavi
中科院分区：
文献类型：
--
作者：
N. M. Khiavi
本文报道了惰性多孔介质中甲烷/空气预混燃烧的二维数值预测。采用基于SIMPLE算法的有限体积法求解了二维Navier-Stokes方程、气固能量方程和化学组分守恒方程。所研究的燃烧器是具有两个不同区域的矩形燃烧器。第一个区域是预热区（低孔隙率基质），随后是实际燃烧区（高孔隙率基质）。为了模拟化学反应，使用骨架机制（26种和77个反应）。为了研究多孔质燃烧器的污染物排放特性，研究了多孔质材料特性、过量空气系数和入口速度对多孔质燃烧器污染物排放特性的影响。预测的气体温度等值线和污染物的形成与现有的实验数据吻合得很好。结果表明，燃烧器下游应采用高导热系数、高对流换热系数和高孔隙率的材料，以降低CO和NO的排放。随着混合气入口速度和过量空气系数的增加，污染物排放量降低。
This paper reports a two-dimensional numerical prediction of premixed methane/air combustion in inert porous media. The two dimensional Navier-stokes equations, the two separate energy equations for solid and gas and conservation equations for chemical species are solved using finite volume method based on SIMPLE algorithm. The burner under study is a rectangular one with two different regions. First region is a preheating zone (low porosity matrix) that followed by the actual combustion region (high porosity matrix). For simulating the chemical reactions, skeletal mechanism (26 species and 77 reactions) is used. For studying the pollutant emissions in this porous burner, the effects of porous matrix properties, excess air ratio and inlet velocity are studied. The predicted gas temperature contour and pollutant formations are in good agreement with the available experimental data. The results indicate that the downstream of the burner should be constructed from materials with high conductivity, high convective heat transfer coefficient and high porosity in order to decrease the CO and NO emissions. Also, with increasing the inlet velocity of gas mixture and the excess air ratio, the pollutant emissions are decreased.