【摘要】 采用组分输运模型对矿井乏风与空气混合气体在二维锥形燃烧器的燃烧过程进行了研究,分析了不同体积分数的瓦斯燃烧特性。结果表明:矿井乏风沿着中心轴线方向射入热氛围后遇热,在燃烧器中心轴线方向发生多点自燃现象,瓦斯浓度降低2.67%,燃烧器出口处二氧化碳浓度达到了0.031 9%;随着乏风体积分数提高,燃烧器内氧化性气氛较强,一氧化碳和二氧化碳体积分数生成量显著增加,分别达到867.61%和283.02%;当瓦斯体积分数小于0.1%,氛围温度不会对燃烧器内瓦斯的燃烧反应产生影响,当瓦斯体积分数为0.2%～0.4%,其贫燃温度为400℃,随着体积分数进一步提高,贫燃温度逐步降低。表明煤矿乏风超低浓度瓦斯通入燃煤锅炉作为辅助燃料进行氧化增热是可行的。更多还原

【Abstract】 The combustion process of ventilation air methane(VAM) and air mixture in a two-dimensional conical burner was studied by using component transport model, and the combustion characteristics of gas with different volume fraction were analyzed. The analysis results showed that the VAM was heated when it was injected into the thermal atmosphere along the central axis direction, the multiple spot spontaneous combustion occurred in the central axis direction of the burner, and the gas concentration decreased by 2.67%, while the carbon dioxide concentration at the burner outlet reached 0.031 9%. With the increase of the volume fraction of VAM, the oxidizing atmosphere in the burner was strong, the volume fraction production of carbon monoxide and carbon dioxide increased significantly, reached 867.61% and 283.02%, respectively. When the gas volume fraction was less than 0.1%, the atmosphere temperature would not affect the combustion reaction of the gas in the burner; when the gas volume fraction was 0.2%-0.4%, the lean combustion temperature was 400 ℃. With the further increase of the gas volume fraction, the lean combustion temperature decreased gradually. The results showed that it was feasible to oxidize and heat the coal fired boiler with ultra-low concentration of coal mine VAM as auxiliary fuel.更多还原