Studies of NO-Char Reaction Kinetics Obtained from Drop-Tube Furnace and Thermogravimetric Experiments
Studies of NO-Char Reaction Kinetics Obtained from Drop-Tube Furnace and Thermogravimetric Experiments
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DOI：
10.1021/ef800695k
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发表时间：
2009-01
期刊：
影响因子：
5.3
通讯作者：
Shaozeng Sun;Juwei Zhang;Xidong Hu;Shaohua Wu;Jiancheng Yang;Yangjie Wang;Yukun Qin
中科院分区：
文献类型：
--
作者：
Shaozeng Sun;Juwei Zhang;Xidong Hu;Shaohua Wu;Jiancheng Yang;Yangjie Wang;Yukun Qin
在扁平火焰流反应器（FFR）中制备了四种煤焦，该反应器可以模拟真实煤粉燃烧环境的温度和气体组成。采用汞孔法和氮吸附法对炭的孔隙结构进行了测定，得到了Hg和bruauer - Emmett - Teller （BET）表面积。在落管炉（DTF）和热重分析仪（TGA）上研究了NO−炭的动力学。在TGA实验中，采用随机孔隙模型（RPM）来描述NO−炭化反应，并获得了本征动力学。通过在同一Arrhenius图上的DTF和TGA实验数据，可以得出TGA是研究高温NO−炭反应动力学的有效工具。在DTF实验中，与BET比表面积相比，Hg比表面积的测量值分散较小，与TGA实验数据吻合较好，可以更好地归一化不同煤焦的反应性。
Four coal chars were prepared in a flat flame flow reactor (FFR), which can simulate the temperature and gas composition of a real pulverized coal combustion environment. The pore structure of chars was measured by mercury porosimetry and nitrogen adsorption, and the Hg and Brunauer−Emmett−Teller (BET) surface areas were obtained. The kinetics of NO−char was studied in a drop-tube furnace (DTF) and thermogravimetric analyzer (TGA). In the TGA experiments, the random pore model (RPM) was applied to describe the NO−char reactions and obtain the intrinsic kinetics. By presenting the data of DTF and TGA experiments on the same Arrhenius plot, it can be concluded that TGA is an available tool to study the kinetics of a high-temperature NO−char reaction. With respect to the DTF experiments, in comparison to the BET surface area, the Hg surface area is a better basis for normalizing the reactivity of different coal chars because of less scatter in the measured values, better agreement with TGA experimental data,...