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褐煤原位气化半焦的反应性及微观结构的演化行为

许修强 ,  王永刚 ,  张书 ,  陈宗定 ,  陈绪军 ,  贺欣

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引用本文: 许修强, 王永刚, 张书, 陈宗定, 陈绪军, 贺欣. 褐煤原位气化半焦的反应性及微观结构的演化行为[J]. 燃料化学学报, 2015, 43(3): 273-280. shu
Citation:  XU Xiu-qiang, WANG Yong-gang, ZHANG Shu, CHEN Zong-ding, CHEN Xu-jun, HE Xin. Evolution behavior of reactivity and microstructure of lignite char during in-situ gasification with steam[J]. Journal of Fuel Chemistry and Technology, 2015, 43(3): 273-280. shu

褐煤原位气化半焦的反应性及微观结构的演化行为

    通讯作者: 王永刚(1960-),男,教授,主要研究方向为煤化学及煤的转化利用,Tel:010-62339882,E-mail:wyg1960@126.com。
  • 基金项目:

    "十二五"国家科技支撑计划重点项目(2012BAA04B02)。 (2012BAA04B02)

摘要: 在自制两段新型固定床反应器上进行了褐煤热解及"热"半焦的原位气化反应的研究。在高纯氩气、400/600/800 ℃的条件下,对褐煤热解5 s后,立刻将反应器移到气化段,同时切换气氛为15%水蒸气对"热"半焦进行原位气化反应(900 ℃、2~30 min),制得原位气化半焦。利用TGA和Raman光谱仪,对原位气化半焦进行反应性和微观结构表征。结果表明,原位气化半焦产率及反应性在气化10 min内降低幅度相对较大,10~30 min降低相对缓慢。大部分的含氧官能团在气化2 min内被释放,气化2 min后含氧官能团变得非常少。半焦中小的芳环与大环体系之比在气化2 min内急剧降低,2~30 min降低较为缓慢。半焦的微观结构对其反应性有一定的影响,随着气化反应的不断进行,半焦中无定形结构、小的缩合芳环等活性基团逐渐减少,反应性相应降低。

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  • 收稿日期:  2014-07-23
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