基于Py-GC联用的煤快速热解实验研究

杨燕梅; 张海; 吕俊复; 杨海瑞

基于Py-GC联用的煤快速热解实验研究

清华大学热能工程系热科学与动力工程教育部重点实验室, 北京 100084

基金项目: 国家高技术研究发展计划(863计划, 2013AA051202); 中国科学院战略性先导科技专项(XDA0402020209).

详细信息

通讯作者:
张海(1967-),男,福建宁化人,教授,主要从事燃烧学、煤清洁燃烧技术研究,E-mail:haizhang@tsinghua.edu.cn.

中图分类号: TK6
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出版历程
- 收稿日期: 2014-07-18
- 修回日期: 2014-09-29
- 刊出日期: 2015-01-30

Experimental study on flash pyrolysis of pulverized coals in Py-GC

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

摘要

摘要: 采用居里点裂解仪—气相色谱仪(Py-GC)联用的方法研究了4种煤的快速热解特性,分析了挥发分主要气相产物及其析出规律.结果表明,大于等于50%的挥发分在热解初期(t ≤ 2 s)释放,采用箔片装载方式的居里点裂解仪完全热解1 mg煤样需要10 s;挥发分主要气相产物中,各气体组分的生成量(mmol/g_coal)顺序为H₂ > CH₄ > CO > CO₂ > C2(C₂H₆、C₂H₄)> C3(C₃H₈、C₃H₆);挥发分释放量随热解温度的升高而增加,相同热解条件下,次烟煤挥发分的释放率高于贫煤和无烟煤;H₂和CH₄的生成量依赖于热解温度,热解温度越高,H₂和CH₄的生成量越多;CO和CO₂的生成量不仅与热解温度相关,而且与煤中的氧含量紧密相关,氧含量越高的煤热解生成的CO和CO₂越多;C2和C3气体的生成量相对于其他气体很少,体积占挥发分气相产物的5%.
- 居里点裂解仪 /
- 气相色谱 /
- 快速热解 /
- 挥发分 /
- 煤种
Abstract: Flash pyrolysis characteristics of four Chinese coals were studied in a Curie-pointed reactor and gas chromatography (Py-GC) combined system. The yield of volatile matter (VM) and evolution of gaseous VM components were measured. It is found that ≥ 50% of VM is released at the early stage (t ≤ 2 s) of flash pyrolysis. It needs ~10 s to totally devolatilize 1 mg coal in the Curie-point reactor with the sample wrapped in a ferromagnetic foil. The yields of gaseous VM component are in the order of H₂ > CH₄ > CO > CO₂ > C2(C₂H₆, C₂H₄) > C3 (C₃H₈, C₃H₆). The yield of VM increases as the pyrolysis temperature increases. Under the same pyrolysis condition, high VM content coals released more VM than the low VM content ones. Yields of H₂ and CH₄ increase greatly with the pyrolysis temperature. Yields of CO and CO₂ depend on both the content of oxygen in the coal and pyrolysis temperature. Amounts of C2 and C3 gases are relatively much less than the others, accounting for less than 5% in volume in the gaseous VM.
- curie-point reactor /
- gas chromatography /
- flash pyrolysis /
- volatile matter /
- coal type

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