硫含量对煤自燃特性及极限参数的影响
Effect of Sulfur Content on Characteristics and Limiting Parameters of Coal Spontaneous Combustion
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摘要: 为了研究高硫煤的自燃特性,并探究煤中硫含量对自燃的影响规律。选择桑树坪煤矿5种不同硫含量的煤样,采用油浴程序升温实验测试煤样的自燃特性并计算了极限参数。结果表明:煤氧化过程中的耗氧速率和CO产生量均随着硫含量的增加呈现出先增加后减少的趋势,煤的硫含量为5.06%处达到最大值。最小浮煤厚度和极限氧浓度均随着温度的增加呈现出先增加后减少的趋势,最大漏风强度则表现出相反的变化趋势;最小浮煤厚度和极限氧浓度均随着硫含量的增加呈现出先降低后升高的趋势,在硫含量为5.06%煤样处达到最小值;最大漏风强度则随着硫含量的增加呈现出先增加后降低的趋势,且在煤样硫含量5.06%时达到最大值。Abstract: To investigate the spontaneous combustion characteristics of high-sulfur coal and the effect law of sulfur content on spontaneous combustion, in this study, five coal samples with different sulfur contents were selected from Sangshuping Coal Mine. The characteristics and limiting parameters of coal self-ignition were tested using an oil bath programmed temperature experiment device. The results illustrated that the oxygen consumption rate and CO productions increased first and then decreased with the increase of sulfur content, and reached the maximum at the sulfur content of 5.06%. The minimum floating coal thickness and limiting oxygen concentration described a trend of increasing first and then decreasing with the coal temperature, but the maximum air leakage intensity displayed an opposite trend. Under the same conditions, the minimum floating coal thickness and limiting oxygen concentration described a trend of reducing first and then enhancing with the sulfur content, reaching the minimum at the coal sample with a sulfur content of 5.06%; the maximum air leakage intensity rose first and then declined as the sulfur content increased, and reached the maximum at the coal sample with a sulfur content of 5.06%. In summary, the self-ignition risk was the maximum at the coal with the sulfur content of 5.06% based the above experimental results.
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