为了解决传统直燃式多孔介质燃烧器存在火焰稳定性差、燃烧效率低和贫极限高的问题，通过构建5种排布方式的多孔介质燃烧器用于低浓度甲烷（low-concentration methane, LCM）燃烧实验，研究不同多孔介质排布方式、当量比和流量对LCM燃烧特性的影响，并分析贫燃工况下的CH₄转化率、污染物排放和烟气温度。结果表明：渐变E型多孔介质燃烧器具有最佳的LCM燃烧适应性，可部分弥补LCM燃烧过程中的界面温度扰动，提高LCM燃烧稳定性。在当量比0.39、流量50 L/min的条件下，LCM驻定燃烧时间超过140 min，火焰位置始终维持在60 mm处。LCM在E型燃烧器中燃烧的CH₄转化率为99.99%，CO和NO_x排放分别为531×10^-6和23×10^-6，产生平均温度588 ℃以上的高品质烟气可用于工业生产。研究成果为提高煤矿低浓度瓦斯利用效率、降低甲烷排放提供重要参考。

In order to address the problems of poor flame stability, low combustion efficiency and high lean-combustion limit in traditional direct-fired porous media burners, five porous media burners with different pore arrangements were constructed for low-concentration methane (LCM) combustion experiments, and the effects of porous media arrangements, equivalence ratios and flow rates on the combustion properties of LCM were investigated. CH₄ conversion, pollutant emissions and flue gas temperatures were also analyzed under lean combustion conditions. The results show that the E-type gradually-varied porous media burner exhibits the optimal LCM combustion adaptability, which can partially compensate for the interface temperature perturbation and improve combustion stability during LCM combustion. At an equivalence ratio of 0.39 and a flow rate of 50 L/min, the stationary combustion time of LCM in the burner exceeds 140 min and the flame position is consistently maintained at 60 mm. The LCM combustion in the E-type porous media achieves a CH₄ conversion of 99.99% with CO and NO_x emissions of 531 × 10^-6 and 23 × 10^-6, respectively, generating high-quality flue gas with a mean temperature of more than 588 ℃ that can be employed in industrial production. The research results provide an important reference for improving the utilization efficiency of low-concentration methane in coal mines and reducing methane emissions.