逐级酸处理对锡盟褐煤的结构及热解特性的影响：气相产物的生成

张晋玲; 王美君; 陈望舒; 付春慧; 任秀荣; 常丽萍

逐级酸处理对锡盟褐煤的结构及热解特性的影响：气相产物的生成

太原理工大学煤科学与技术教育部和山西省重点实验室, 山西太原 030024

基金项目: 国家自然科学基金(21176165, 1261110);高等学校博士学科点专项科研基金博导类资助课题(20111402110009);山西省科技基础条件平台建设项目(2012091018);山西省研究生优秀创新项目。

详细信息

通讯作者:
常丽萍,Tel/Fax:0351-6010482,E-mail:lpchang@tyut.edu.cn。

中图分类号: TQ530.2
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出版历程
- 收稿日期: 2012-12-26
- 修回日期: 2013-02-07
- 刊出日期: 2013-10-30

Effects of step acid treatment process on the structure and pyrolysis characteristics of Ximeng brown coal: formation of gaseous products

Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China

摘要

摘要: 为了考察逐级酸处理对锡盟褐煤热解过程中气相产物生成的影响,对锡盟褐煤进行了HF-HNO₃-HCl逐级处理,原煤和酸处理煤样采用固定床热解-气相色谱法在线分析气相产物释放行为和变化的研究。结果表明,逐级酸处理过程对锡盟褐煤热解过程中含氢气体、含氧气体和含硫气体的释放有着明显的影响。不同气体的形成途径、形成阶段和温区不同,导致酸处理过程对其的影响有明显的差异。逐级酸处理的煤样,除因矿物质对煤热解气相产物的影响减弱外,HNO₃处理样还因其氧化作用引起了气相产物释放趋势的变化,使得含氢气体的释放量降低、含氧气体释放量增加;降低了H₂S的累积释放转化率而促进COS的释放。
- 酸处理 /
- 固定床 /
- 热解 /
- 气相产物
Abstract: Ximeng brown coal was leached by HF, HNO₃ and HCl solution step by step in order to study the effects of acid pretreatment on the formation of gaseous products during coal pyrolysis. A fixed bed pyrolysis-gas chromatography was used to analyze the release behaviors of gaseous products from pyrolysis of raw and the pretreated coals. The results show that there is an obvious influence of acid pretreatment on the release behaviors of hydrogen-, oxygen-and sulfur-containing gases during coal pyrolysis. The formation routes, stages and release temperature intervals for various gases are different, which result in that the influences of minerals removed by acid leaching behave significantly different. The gaseous products were also dramatically influenced by oxidative characteristic during HNO₃ pretreatment, which causes that the release amount of hydrogen-containing gases decreases, and that of oxygen-containing gases increases. There is a discrepant influence on the release of H₂S and COS by HNO₃ pretreatment; the former decreases and the later increases.
- acid treatment /
- fixed-bed reactor /
- pyrolysis /
- gaseous products

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