基于球形多孔介质低浓度瓦斯燃烧特性的研究.pdfVIP

江苏省工程热物理学会第六届学术会议 4-11 基于球形多孔介质低浓度瓦斯燃烧特性研 究 代华明，林柏泉，李庆钊，王超群，王琪瑶 （中国矿业大学安全工程学院；煤炭资源与安全开采国家重点实验室，徐州 22116 ） 摘要：为研究球形多孔介质燃烧器中的低浓度瓦斯燃烧特性，采用计算流体力学方法对其进 行数值分析。研究了不同当量比时燃烧器中温度分布、污染物排放情况，燃烧器中速率分布 情况，不同初始温度时温度分布、污染物排放情况。结果表明，球形多孔介质燃烧器中轴向 最高温度值和出口 CO、NOx 排放量随当量比增大逐渐增大，且最高温度值与当量比具有线 性相关性；球形多孔介质的变径作用有助于稳定火焰面和延长烟气的滞留时间；适当增大初 始温度值可以降低污染物 CO、NOx 的排放量。 关键词：球形多孔介质；低浓度瓦斯；当量比 Combustion Characteristics of Low Concentration Coal Mine Methane in Spherical Porous Media Combustor DAI Hua-ming, LIN Bai-quan, LI Qing-zhao, WANG Chao-qun ，Wang Qi-yao School of Safety Engineering, China University of Mining Technology; （ State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, China） Abstract: The combustion of low concentration coal mine methane in spherical porous media has been simulated through a two-dimensional model by using computational fluid dynamics. The situations of temperature and pollutant distribution at different equivalence ratios are studied. Meanwhile, the velocity distribution is studied. The paper also studies the temperature and pollutant distribution at different initial temperatures. It is concluded that, the axial maximums temperature, CO production and NOx production of spherical porous media combustor increase as the equivalence ratios increase; The linear correlation is observed between axial maximums temperature and equivalence ratios; The change of diameter in spherical porous is contribute to stabling flame surface and lengthening exhaust gas remaining time; Increasing initial temperature appropriately can reduce the production of CO and NOx. Key words: spherical porous media; low concentration coal mine methane; equivalence ratios 1.引言 [1] 70% 煤炭是我国的主导能