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浙江大学学报(工学版)
J4  2014, Vol. 48 Issue (4): 653-659    DOI: 10.3785/j.issn.1008-973X.2014.04.014
机械与能源工程     
微波处理对我国典型褐煤气化特性的影响
葛立超, 张彦威, 王智化, 周俊虎, 岑可法
浙江大学 能源清洁利用国家重点实验室,浙江 杭州 310027
Influence of microwave irradiation treatment on gasification characteristics of typical Chinese lignite
GE Li-chao, ZHANG Yan-wei, WANG Zhi-hua, ZHOU Jun-hu, CEN Ke-fa
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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摘要：

使用微波辐照方法在130 ℃和160 ℃对我国主要褐煤产区不同变质程度的3种典型褐煤进行脱水改性,在对脱水改性前、后褐煤煤质组成分析的基础上使用低温氮吸附法和热重研究改性前、后褐煤孔隙结构和CO2气化特性上的差异.结果表明,微波能够在较短时间内大幅度降低褐煤中的水分,最高降幅达87.93%,处理后褐煤中的水质量分数都小于10%,固定碳质量分数和热值上升.褐煤微波改性后孔隙结构向微孔方向发展,比表面积和孔容上升,平均孔径下降.CO2气化结果表明,褐煤经过微波处理后气化速率上升,达到50%碳转化率时的特征温度降低,改性后褐煤的气化活性变好.动力学计算结果表明,改性后褐煤气化活化能下降,反应级数发生变化.较高的微波处理终温使得微波脱水改性的效果更加明显,褐煤组成、结构和气化特性的变化更大.煤阶相对较低、水质量分数较高的褐煤脱水效果更显著,煤阶相对较高、水质量分数较少的褐煤改性造成结构和气化特性的变化更明显.
Abstract:

Three typical lignites with different metamorphic grades in China were upgraded by microwave irradiation (MI) treatment at 130 and 160 ℃. The changes of coal composition were investigated. The physical properties of pore structure, including surface area, pore volume, and pore size were obtained through N2 adsorption measurement. The chemical properties were determined through thermo-gravimetric analysis with emphases on the influence of MI treatment on the coal gasification characteristics. Results showed that the upgrading process significantly decreased the inherent moisture at a maximum degree of 87.93% in a short time, and increased the calorific value and mass fraction of fixed carbon. The mass fractions of moisture of all upgraded coals were less than 10%. After upgrading, pore distribution extended to the micropore region, the surface area and volume increased, and the average pore size decreased. Thermo-gravimetric analysis showed that the temperature decreased when carbon conversion rate reached 50%, and the gasification rate increased, indicating the increase of gasification activity. The kinetic calculation results showed that activation energy decreased and the reaction order of mechanistic model changed. All the changes were more obvious when the upgraded temperature increased. When the raw lignite had a lower coal rank with higher mass fraction of moisture, the dewatering process was more evident. For the lignite of relative higher rank with lower mass fraction of moisture, the influence on coal structure and gasification was more obvious.
出版日期: 2014-09-03
:  TQ 536  
基金资助:

 国家“973”重点基础研究发展规划资助项目(2012CB214906).
通讯作者: 张彦威,男,副教授.     E-mail: zhangyw@zju.edu.cn
作者简介: 葛立超(1987—), 男,博士生, 从事褐煤提质及燃烧气化的研究.E-mail: workhard@zju.edu.cn
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引用本文:

葛立超, 张彦威, 王智化, 周俊虎, 岑可法. 微波处理对我国典型褐煤气化特性的影响[J]. J4, 2014, 48(4): 653-659.

GE Li-chao, ZHANG Yan-wei, WANG Zhi-hua, ZHOU Jun-hu, CEN Ke-fa. Influence of microwave irradiation treatment on gasification characteristics of typical Chinese lignite. J4, 2014, 48(4): 653-659.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2014.04.014    或    http://www.zjujournals.com/eng/CN/Y2014/V48/I4/653

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