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以胜利褐煤为研究对象,分别采用水洗和酸洗法除去煤样中灰分,应用红外光谱、氮气吸附法、热分析等对煤样进行表征,系统研究了水洗、酸洗过程对煤样的结构和燃烧特性的影响.结果表明,水洗对煤样的结构及燃烧特性影响不大,酸洗增加了煤中含氧官能团的数量,累积孔结构从1.5nm开始显著减少,比表面积由原煤的5.13m2/g降低到2.41m2/g,减小了53.02%.动力学分析显示,原煤(SLR)、水洗煤(SLD)、酸洗煤(SLA)的燃烧反应级数分别为2,2,1,在挥发分析出及煤焦的形成阶段,SLR,SLD和SLA的活化能分别为5001.30,3698.95,17110.08J/mol,而在煤焦的燃烧阶段,SLR,SLD和SLA的活化能分别为40991.58,40065.07,44712.98J/mol.
Taking Shengli lignite as the research object, the ash content of coal sample was removed by water washing and pickling respectively. The coal samples were characterized by infrared spectroscopy, nitrogen adsorption and thermal analysis. The effects of washing and pickling on the structure of coal sample And the combustion characteristics.The results show that the washing has little effect on the structure and combustion characteristics of the coal sample, pickling increases the number of oxygen-containing functional groups in the coal, the cumulative pore structure decreases significantly from 1.5nm, and the specific surface area increases from 5.13 m2 / g to 2.41m2 / g, a decrease of 53.02% .Kinetic analysis shows that the combustion reaction order of SLR, SLD and SLA is 2,2,1, The activation energies of SLR, SLD and SLA were 5001.30, 3698.95 and 17110.08 J / mol respectively during the volatilization analysis and char formation. In the combustion stage of coal char, the activation energies of SLR, SLD and SLA were 40991.58, 40065.07, 44712.98 J / mol.