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为分析不同种类阻化剂阻化性能差异,实现阻化剂优选,设计并完成原煤与分别添加碳酸氢铵、聚磷酸铵、聚丙烯酸酯(PA)等3种阻化剂的煤样的热重分析(TGA)对比试验。采用动力学分析方法,对比添加与不添加阻化剂的焦煤煤样在不同燃烧阶段的活化能。结果表明:3种阻化剂都不影响焦煤正常燃烧,且都有较好的阻化效果,碳酸氢铵、聚磷酸铵、PA分别使煤样氧化增重阶段的活化能从原煤的78.92 kJ/mol增加到81.63、94.22和80.55 kJ/mol。综合分析燃烧全过程,聚磷酸铵组煤样各阶段活化能增幅最大,说明聚磷酸铵阻化能力最强;PA组煤样在燃烧失重阶段活化能最低,燃烧最充分,利用最高效。阻化作用分析表明:聚磷酸铵阻化剂和PA阻化剂都能高效抑制煤自燃,可以作为优选阻化剂在实际生产中推广使用。
In order to analyze the difference of the resistance of different types of inhibitors and realize the optimization of the inhibitors, the heat of the coal samples was designed and completed with the addition of three kinds of inhibitors such as ammonium bicarbonate, ammonium polyphosphate and polyacrylate (PA) Reanalysis (TGA) comparison test. Kinetic analysis was used to compare the activation energies at different combustion stages of coking coal samples with and without the addition of retardant. The results showed that the three kinds of inhibitors did not affect the normal combustion of coking coal, and had a good resistance to deteriorating. The activation energies of the samples at the stage of oxidation and weight gain were respectively 78.92 kJ / mol to 81.63, 94.22 and 80.55 kJ / mol. Comprehensive analysis of the whole process of combustion, ammonium polyphosphate sample of the largest increase in the activation energy of each stage, indicating that ammonium polyphosphate resistance is strongest; PA group in the combustion of the weight loss phase of the lowest activation, combustion most fully utilized the most efficient. The analysis of the resistance of the catalyst shows that both the ammonium polyphosphate inhibitor and the PA inhibitor can effectively suppress the spontaneous combustion of coal and can be used as a preferred retardant in practical production.