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胜利褐煤半焦冷却处理对其微观结构及反应性能的影响

许修强 ,  王永刚 ,  陈宗定 ,  白磊 ,  张锟俊 ,  杨萨莎 ,  张书

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引用本文: 许修强, 王永刚, 陈宗定, 白磊, 张锟俊, 杨萨莎, 张书. 胜利褐煤半焦冷却处理对其微观结构及反应性能的影响[J]. 燃料化学学报, 2015, 43(1): 1-8. shu
Citation:  XU Xiu-qiang, WANG Yong-gang, CHEN Zong-ding, BAI Lei, ZHANG Kun-jun, YANG Sa-sha, ZHANG Shu. Influence of cooling treatments on char microstructure and reactivity of Shengli brown coal[J]. Journal of Fuel Chemistry and Technology, 2015, 43(1): 1-8. shu

胜利褐煤半焦冷却处理对其微观结构及反应性能的影响

    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: 采用不同的冷却方式对胜利褐煤热解"热"半焦进行冷却处理,考查了冷却方式对半焦微观结构及反应性能的影响.利用特制两段新型石英反应器,在高纯氩气、400、600、800 ℃的条件下,对褐煤热解30 min制得的"热"焦,分别浸入室温、干冰及液氮环境中得到冷态半焦,然后在15%水蒸气、900 ℃、10 min的条件下对冷态半焦进行非原位气化反应.为了比较,同样热解条件下制得的"热"半焦不经冷却,通过直接切换反应气氛为15%水蒸气进行原位气化(气化条件与非原位气化相同).利用TGA、SEM、BET和Raman光谱仪对半焦反应性和微观结构进行表征和分析.结果表明,"热"焦的水蒸气原位气化半焦产率低于冷态半焦的非原位气化.冷却处理对半焦的孔结构影响较大,随着冷却速率的增大,半焦比表面积及总孔容积显著降低,但对半焦的化学结构(芳环体系和含氧官能团)的影响非常小.冷却速率越大,半焦的反应性越低,冷态半焦反应性能降低主要由于冷却对半焦孔结构造成的不可逆转的破坏.

English

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  • 收稿日期:  2014-08-29
  • 网络出版日期:  2014-11-19
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