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为进一步揭示不同环境条件下高硫煤的低温氧化特性,选取含硫量较低、自燃倾向性较高的褐煤,向其添加不同比例的FeS2,配制成含量分别为3%,5%,7%的混合高硫煤样,利用中国矿业大学自行研制的煤氧化模拟试验系统,测试分析干燥混合煤样在低温氧化过程中,交叉温度和指标气体CO产生量体积的变化。试验结果表明,在低温干燥的条件下,随着FeS2含量的增加,煤样的氧化特性受到抑制:交叉点温度升高;指标气体CO产生量在相同温度时体积降低。因此,在高硫煤层自燃火灾防治过程中,应尽量控制煤层周围环境的干燥度。
In order to further reveal the low-temperature oxidation characteristics of high-sulfur coal under different environmental conditions, lignite with low sulfur content and high tendency of spontaneous combustion was selected to add different proportions of FeS2 to 3%, 5%, 7% respectively % Of mixed high-sulfur coal samples, using the self-developed coal oxidation simulation test system developed by China University of Mining and Technology to test and analyze the changes of the cross-over temperature and the volume of CO produced during the low-temperature oxidation of the dry mixed coal samples. The experimental results show that under the conditions of low temperature drying, with the increase of FeS2 content, the oxidation characteristics of coal samples are inhibited: the temperature at the cross point increases; and the CO content of indicator gas decreases at the same temperature. Therefore, in the process of prevention and treatment of spontaneous combustion of high-sulfur coal seam, the dryness of the surrounding environment should be controlled as much as possible.