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阻化技术是防治煤自燃的常用技术之一,研究阻化剂对煤自燃极限参数的影响是确定阻化效果的关键。采用程序升温试验,分析气煤和长焰煤的原煤样和经Mg Cl2、KCl、Ca Cl2、Na Cl 4种阻化剂处理后的煤样耗氧速率和放热强度,并计算自燃极限参数和阻化率。结果表明:氯盐阻化剂可降低煤自燃低温阶段的煤耗氧速率和放热强度;4种阻化剂中对气煤煤样的平均阻化率最高是Mg Cl2(63.6%),对长焰煤则是Ca Cl2(45.9%),平均阻化率与自燃极限参数变化率呈正相关;气煤经Mg Cl2处理后自燃极限参数变化率最大,长焰煤经Ca Cl2阻化处理后的自燃极限参数变化率最大,对于气煤4种阻化剂阻化能力由大到小为Mg Cl2、KCl、Ca Cl2、Na Cl,对长焰煤则为Ca Cl2、Mg Cl2、KCl、Na Cl;氯盐阻化剂中Mg Cl2对气煤自燃极限参数影响最大,阻化效果好,而对长焰煤则为Ca Cl2。
Impedance technology is one of the most commonly used technologies to prevent and control coal spontaneous combustion. Studying the influence of the retarding agent on the limit parameter of coal spontaneous combustion is the key to determining the resistance effect. The temperature rise test was used to analyze the oxygen consumption rate and the exothermic intensity of the raw coal samples of gas coal and long flame coal and the four kinds of retarders treated with Mg Cl2, KCl, Ca Cl2 and Na Cl. The calculated autoignition limit parameters And resistance rate. The results show that: the chlorine inhibitor can reduce the oxygen consumption rate and the exothermic rate of coal in the low-temperature stage of coal spontaneous combustion. Among the four kinds of retardants, the average resistivity of the gas coal is MgCl 2 (63.6%), Flame coal is CaCl 2 (45.9%), and the average resistivity is positively correlated with the rate of change of spontaneous combustion limit parameter. The change rate of spontaneous combustion limit parameter of coal after MgCl 2 treatment is the largest. Spontaneous combustion The maximum rate of change of limit parameter is maximum, the resistance to gasification of four kinds of gasifier is Mg Cl2, KCl, Ca Cl2, Na Cl and Ca Cl2, Mg Cl2, KCl, Na Cl for long flame coal; Chloride resistance agent Mg Cl2 has the greatest influence on the limit parameter of spontaneous combustion of gas coal, and has a good resistance-deteriorating effect, while it is Ca Cl2 for long-flame coal.