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为研究火区封闭过程中气体组分变化,通过分析火区内气体成分判定火区燃烧状态,以安全封闭火区防止因火灾引发瓦斯爆炸事故.利用程序升温实验研究了风量分别为40 m L/min、80 m L/min、120 m L/min、160 m L/min和200 m L/min时褐煤燃烧产生的碳氧化物体积分数及O_2体积分数变化规律.研究结果表明:风量越大,O_2体积分数变化趋势越小,消耗氧气量越小;相同温度条件下,O_2体积分数有随着风量增加呈现增加的规律性;随着风量增加,CO、CO_2生成量均减少,且CO、CO_2生成量与温度之间呈指数关系变化;相同温度下,随着风量增加,CO、CO_2生成量减少,且燃烧阶段CO生成量与风量呈指数关系变化,CO_2生成量与风量呈线性关系变化.随着风量增加,CO生成初始温度滞后,相同温度时CO生成量减少.
In order to study the change of gas composition in the process of fire area sealing, the combustion status of fire area was determined by analyzing the gas composition in the fire area, and the fire area was safely closed to prevent the gas explosion caused by fire.According to the programmed temperature increase experiment, the volume fraction of O 2 and the volume fraction of O 2 produced by the combustion of lignite at 80 m L / min, 120 m L / min, 160 m L / min and 200 m L / min, respectively.The results show that: , The smaller the trend of O_2 volume fraction is, the smaller the oxygen consumption is. Under the same temperature, the O_2 volume fraction increases with the increase of air volume. With the air volume increasing, the CO and CO_2 production decreases, At the same temperature, with the increase of air volume, the production of CO and CO_2 decreased, and the amount of CO produced during combustion phase showed an exponential relationship with the air volume. The CO 2 production and the air volume showed a linear relationship As the air volume increases, the initial temperature of CO formation lags behind and the CO formation decreases at the same temperature.