褐煤燃烧供风量对碳氢化物生成影响研究

Study on influence of air supply amount on hydrocarbon production for lignite combustion

为研究煤矿火区封闭时燃烧生成气体对瓦斯爆炸的影响,选取平庄瑞安煤矿褐煤作为试验煤样,利用管式炉程序升温和气相色谱仪进行生成气体成分分析试验,得到风量分别为40,80,120,160和200 m L/min时,褐煤燃烧生成碳氢化物气体的初现温度及其体积分数变化规律。结果表明,风量增加,碳氢化物气体初现温度升高;随着温度升高,CH_4气体生成量增加,在348℃时达到最大值,C_2H_6,C_3H_8,C_2H_4与C_2H_2气体生成量也增加,在400℃时达到最大值;相同温度下,随着风量增加,碳氢化物生成量减小,且燃烧阶段CH_4,C_2H_6,C_3H_8,C_2H_4生成量与风量呈指数关系变化,C_2H_2生成量与风量呈线性关系变化。

In order to study effects of gases produced from a closed combustion area on coal mine gas explosion Rui＇an coal mine lignite of Pingzhuang was selected as experimental coal sample and experiments were carried out using tube furnace temperature programmed and gas phase chromatograph. Generated gas composition analysis was conducted. Lignite combustion hydrocarbon gas initial production temperature and the rule of gas volume fraction were obtained when air flow rates were 40, 80, 120, 160 and 200 m L/min. The results show that hydrocarbon initial production temperature increases as the air volume increases, that with the increase of temperature, CH4 gas production increases and reaches maximum value at 348℃, C2H6, C3H8, C2H4 and C2H2 gas production also increases and reaches maximum value at 400℃,that at the same temperature, hydrocarbon generation decreases with the increase of air flow rate, and that at combustion stage, CH4, C2H6, C3H8, C2H4 gas production show exponential relationshipswith air flow rate, C2H2 gas production shows linear relationshipswith air flow rate.