次磷酸盐对煤自燃的阻化特性实验研究
Experimental Research on Resistance Characteristics of Hypophosphite to Coal Spontaneous Combustion
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摘要: 为了探究次磷酸盐阻化剂对煤自燃氧化的抑制特性,制备了原煤样以及浓度分别为15%、17%、20%的次磷酸钠、次磷酸铝阻化煤样。采用程序升温氧化实验、阻化率计算和同步热分析实验,分析了次磷酸盐阻化剂对煤自燃过程中CO生成的影响,确定了各磷酸盐阻化剂的最佳浓度,分析了其抑制煤自燃氧化的热失重特性及放热特性。结果表明:次磷酸盐阻化剂能够抑制煤自燃过程中CO的生成,其最佳阻化浓度均为20%;次磷酸盐阻化剂可显著提高煤的着火温度、燃尽温度等特征温度点,其中次磷酸钠阻化剂的阻化效果优于次磷酸铝阻化剂。此外,次磷酸钠阻化剂能够显著提高煤自燃初始放热温度和最大释热功率温度,降低煤自燃最大释热功率和总放热量。Abstract: To explore the inhibition characteristics of hypophosphate inhibitors on coal spontaneous combustion oxidation, raw coal sample and the coal samples treaded by sodium hypophosphate and aluminum hypophosphate with the concentrations of 15%, 17% and 20% were prepared. The effect of hypophosphite inhibitors on CO emission during coal spontaneous combustion was analyzed by the oxidation experiment of programed heating. The optimum concentration of each phosphate inhibitor was determined by calculating the inhibition rate. The thermogravimetric and exothermic characteristics of coal spontaneous combustion oxidation were analyzed by synchronous thermal analysis. The results show that the hypophosphite inhibitors can inhibit the formation of CO during coal spontaneous combustion, and the optimum inhibition concentration is 20%. Hypophosphate inhibitors can significantly increase the characteristic temperature points of coal, such as the ignition temperature and the burnout temperature. Among them, the inhibitory effect of sodium hypophosphite inhibitor is better than that of aluminum hypophosphite inhibitor. In addition, sodium hypophosphite inhibitor can observably increase the initial heat release temperature and maximum heat release power temperature, and reduce the maximum heat release power and total heat release of coal spontaneous combustion.
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