煤自燃阻化剂的阻化效果动力学分析及优选

发布时间：2018-11-06 16:18

【摘要】：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。
[Abstract]:In order to analyze the difference of inhibition performance of different kinds of inhibitor and to realize the optimum selection of inhibitor, a comparative test of thermogravimetric analysis (TGA) was designed and completed between raw coal and three kinds of inhibitor, which were added ammonium bicarbonate, ammonium polyphosphate and polyacrylate (PA), respectively. The kinetic analysis method was used to compare the activation energy of coking coal samples with and without inhibitor in different combustion stages. The results show that all of the three inhibitors do not affect the normal combustion of coking coal, and all of them have better inhibition effect, such as ammonium bicarbonate, ammonium polyphosphate, ammonium bicarbonate and ammonium polyphosphate. PA increased the activation energy of coal sample from 78.92 kJ/mol to 81.633 kJ/mol. 94.22 and 80.55 kJ/mol., respectively. According to comprehensive analysis of the whole combustion process, the activation energy of ammonium polyphosphate group coal samples is the largest in each stage, which shows that ammonium polyphosphate has the strongest inhibition ability, while the PA coal sample has the lowest activation energy, the most sufficient combustion and the most efficient utilization in the stage of combustion weightlessness. The results of inhibition analysis show that both ammonium polyphosphate inhibitor and PA inhibitor can effectively inhibit spontaneous combustion of coal and can be used as selective inhibitor in practical production.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;
【基金】：国家重点研发计划专项资助(2016YFC0801803)
【分类号】：TD752.2

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