微型流化床反应分析及其对煤焦气化动力学的应用

doi:10.3969/j.issn.0438-1157.2013.01.032

化工学报 ›› 2013, Vol. 64 ›› Issue (1): 289-296.DOI: 10.3969/j.issn.0438-1157.2013.01.032

• 催化、动力学与反应器 • 上一篇下一篇

微型流化床反应分析及其对煤焦气化动力学的应用

曾玺¹, 王芳^1,2, 韩江则¹, 张聚伟¹, 刘云义², 汪印¹, 余剑¹, 许光文¹

1. 中国科学院过程工程研究所,多相复杂系统国家重点实验室,北京100190;
2. 沈阳化工大学化学工程学院,辽宁沈阳 110142

收稿日期:2012-08-22 修回日期:2012-10-22 出版日期:2013-01-05 发布日期:2013-01-05
通讯作者: 许光文,余剑
作者简介:曾玺(1982—),男,博士。
基金资助:
国家重点基础研究发展计划项目(2011CB201304);科技部重大仪器专项(2011YQ120039);国家自然科学基金项目(21106156,21006110, 21076217, 51174283);中国科学院战略性先导科技专项"低阶煤清洁高效梯级利用关键技术与示范"(XDA07010100)。

Micro fluidized bed reaction analysis and its application to coal char gasification kinetics

ZENG Xi¹, WANG Fang^1,2, HAN Jiangze¹, ZHANG Juwei¹, LIU Yunyi², WANG Yin¹, YU Jian¹, XU Guangwen¹

1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Chemical Engineering, Shenyang Institute of Chemical Technology, Shenyang 110142, Liaoning, China

Received:2012-08-22 Revised:2012-10-22 Online:2013-01-05 Published:2013-01-05
Supported by:
supported by the National Basic Research Program of China (2011CB201304),Big Instrument Program (2011YQ120039), the National Natural Science Foundation of China (21106156, 21006110, 21076217, 51174283) and the Strategic Priority Research Program"Key technologies and demonstration for cleaning and highly efficient of low rank coal" (XDA07010100).

摘要/Abstract

摘要： 在概述最新研发的微型流化床反应分析(micro-fluidized bed reaction analysis,MFBRA)方法与应用的基础上,应用该方法进一步研究了半焦-CO₂、半焦-水蒸气等温气化反应动力学,并与热重分析(thermogravimetric analyzer,TGA)求取的气化反应动力学数据比较。在最小化气体扩散的实验条件下,利用MFBRA和TGA测定求算的半焦-CO₂、半焦-水蒸气气化反应在受反应动力学控制的低温段的活化能非常接近,说明了MFBRA对等温气化反应分析的适用性和可靠性。实验研究还发现:半焦-CO₂、半焦-水蒸气气化反应在MFBRA中受反应动力学控制的温度范围较在TGA中明显宽,且在具有明显扩散影响的高温段通过MFBRA测定的半焦-CO₂气化反应表观活化能明显大于利用TGA测定的值,表明在MFBRA中受到的气体扩散抑制效应较小。

关键词: 微型流化床, 热重, 半焦气化, 反应动力学, 等温反应

Abstract: After summarizing the newly developed micro-fluidized bed reaction analysis (MFBRA) and its existing applications, its application to the kinetics of isothermal gasification reaction between coal char and CO₂/steam were further extended.The resulting kinetic data were compared with the measurements in thermogravimetric analyzer (TGA).Under minimized limitations of heat and mass transfer, the activation energy of char gasification with CO₂ and steam in the kinetically controlled low temperature region was very close to that obtained from TGA, validating the reliability of MFBRA for the analysis of char gasification kinetics.Moreover, the temperature range of the kinetically controlled reaction region was found to be obviously wider in MFBRA than in TGA for both char-CO₂ and char-steam reactions.At higher temperatures with evident limitations of heat and mass transfer on the reaction kinetics, the estimated activation energy was obviously higher with MFBRA than that with TGA.All of these further demonstrated that the diffusion limitation in MFBRA was weaker than that in TGA for gasification of coal char.

Key words: MFBRA, thermogravimetric analyzer, char gasification, reaction kinetics, isothermal reaction

中图分类号:

TQ523.2

曾玺, 王芳, 韩江则, 张聚伟, 刘云义, 汪印, 余剑, 许光文. 微型流化床反应分析及其对煤焦气化动力学的应用[J]. 化工学报, 2013, 64(1): 289-296.

ZENG Xi, WANG Fang, HAN Jiangze, ZHANG Juwei, LIU Yunyi, WANG Yin, YU Jian, XU Guangwen. Micro fluidized bed reaction analysis and its application to coal char gasification kinetics[J]. CIESC Journal, 2013, 64(1): 289-296.

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微型流化床反应分析及其对煤焦气化动力学的应用

Micro fluidized bed reaction analysis and its application to coal char gasification kinetics

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