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›› 2012, Vol. 12 ›› Issue (1): 68-74.

• 过程与工艺 • 上一篇    下一篇

粉煤气化条件下不同粒径半焦的表征与气化动力学

孙德财 张聚伟 赵义军 刘云义 余剑 许光文   

  1. 中国科学院过程工程研究所多相复杂国家重点实验室 中国科学院过程工程研究所多相复杂国家重点实验室 哈尔滨工业大学热能工程学院 沈阳化工大学化学工程学院 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 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
  • 收稿日期:2011-11-07 修回日期:2011-12-12 出版日期:2012-02-20 发布日期:2012-02-20
  • 通讯作者: 孙德财

Characterization and Gasification Kinetics of Char with Different Particle Sizes under Gasification Conditions of Pulverized Coal

SUN De-cai ZHANG Ju-wei ZHAO Yi-jun LIU Yun-yi YU Jian XU Guang-wen   

  1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences School of Energy Science and Engineering, Harbin Institute of Technology School of Chemical Engineering, Shenyang Institute of Chemical Technology State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences (1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences
  • Received:2011-11-07 Revised:2011-12-12 Online:2012-02-20 Published:2012-02-20
  • Contact: SUN De-cai

摘要: 利用可模拟真实粉煤气化条件的平流火焰反应器制取了同一煤种的2种不同平均粒径的半焦,并对其进行了物理表征和气化反应动力学研究. 其物理表征显示,小颗粒半焦的平均比表面积远小于大颗粒半焦. 半焦的CO2气化实验表明,含很多小孔的大颗粒半焦的气化反应受内扩散影响显著,比表面积较小的小颗粒半焦具有更高的气化反应速率. 利用随机孔模型导出了反应速率Ri. 根据小颗粒半焦在不同温度下平衡态时的反应速率Ri,s值获得半焦气化的本征气化反应速率表达式为Ri=1.243′103exp(-19243.5/T) g/(m2×min).

关键词: 粉煤气化, 半焦, 粒径, 比表面积, 反应动力学, 反应机理

Abstract: Char samples with different averaged diameter particles were prepared from a given raw coal in a flat flame reactor which simulated the real gasification conditions of pulverized coal. Their physical structure was characterized and their CO2 gasification kinetics studied. The averaged specific surface area of small particle char was far lower than that of large one. Analyzing the experimental data of char CO2 gasification found that although the specific surface area of small char was lower than that of the large char, the small char had higher gasification reaction rate. This is because the large particle char contained lots of meso-pores and caused the inner diffusion limit to the gasification reaction. The random pore model was used to derive a gasification rate Ri. With the reaction rate Ri,s at steady-state under different temperatures, the intrinsic reaction rate of char CO2 gasification was expressed as Ri=1.243′103exp(-19243.5/T) g/(m2×min).

Key words: pulverized coal gasification, char, particle size, specific surface area, reaction kinetics, reaction mechanism

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