预处理对褐煤抑爆效果的影响研究

Effects of pretreatment on lignite restrained thermal cracking

为降低褐煤的热爆性,采用鼓风干燥箱及马弗炉考察了预处理温度、时间对宝清褐煤和乌兰察布褐煤的抑爆效果,探讨了2种褐煤抑爆的最佳预处理条件,分析了最佳预处理条件下褐煤的析出产物特性。结果表明,随着预处理温度的升高,宝清褐煤热爆性增强,乌兰察布褐煤热爆性先降低后升高。2种褐煤不同时间预处理后热稳定性均大幅提高。褐煤抑爆最佳预处理条件为:宝清褐煤110℃下预处理4 h,乌兰察布褐煤150℃下预处理6 h。最佳处理条件下,2种褐煤析出的主要产物为水,其质量占失重量的97%以上,其余为少量气体产物,焦油产率为零。

In order to inhibit the thermal cracking of lignite,taking thermal stability as research object,the restrained thermal cracking effects of pretreatment temperature and time on Baoqing and Wulanchabu lignite were systematically studied using air dry oven and muffle furnace. The optimum pretreatment conditions for inhibiting thermal cracking of two kinds of lignite were discussed,and the products properties under the optimum pretreatment conditions were analyzed. The results showed that,with the increase of pretreatment temperature,thermal cracking of Baoqing lignite was enhanced,Wulanchabu lignite first decreased,then increased. The thermal stability of two kinds of lignite increased significantly after different pretreatment time. The optimum pretreatment conditions for inhibiting thermal cracking of two kinds of lignite were Baoqing lignite 110 ℃ and 4 h,Wulanchabu lignite 150 ℃ and 6 h. The main educts of two kinds of lignite during pretreatment were water,which accounted for more than 97% of the total weight loss,the rest was a little gas products,and there were no tar.