不同碱化改性方法对麦秸型煤粘结性的影响

Effects of alkali treatment of wheat straw on the mechanical properties of straw-coal briquette

以黄熟期麦秸和无烟煤为对象,利用单因素和三因素四水平正交设计试验方法,研究不同碱化剂质量分数、热处理时间以及固液质量配比对麦秸型煤力学强度的影响。结果表明:随着碱化剂质量分数的增加、热处理时间的延长和固液配比的升高,麦秸型煤的抗压强度和跌落强度均呈先升高后降低的趋势。正交试验发现影响麦秸型煤样品粘结性的主要因素为碱化剂质量分数,其次为热处理时间和固液配比,且在碱化处理过程中不同影响因素之间存在较强交互作用。麦秸型煤碱化处理的最优工艺为:碱化剂质量分数2%,热处理时间1.5h,固液配比1∶25。

With the yellow ripening stage of wheat straw and anthracite as experimental material,by the methods of single-factor and three-factor four-level orthogonal design,the influence of mechanical strength on straw-coal-briquettes samples were studied by the different alkalizing agent concentration and the different heat treatment time and the different solid-liquid mass ratio.The results showed that,with the increasing of heat treatment time,alkalizing agent concentration and prolonging of solid-liquid ratio,compressive strength and shatter index of straw-coal-briquettes samples first increased and then decreased.Orthogonal test showed that the main factors affecting straw-coalbriquettes samples cohesiveness were alkalizing agent concentration,followed by heat treatment time and the solidliquid mass ratio,and there was a strong interaction between influence factors in alkali treatment process.The optimal process for straw-coal-briquettes alkalization treatment was the alkalizing agent concentration at 2%,with 1.5 hheat treatment and a solid-liquid ratio of 1∶25.