Catalytic effect of metallic oxides on combustion behavior of high ash coal
Catalytic effect of metallic oxides on combustion behavior of high ash coal
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DOI：
10.1021/ef070054v
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发表时间：
2007-09-01
期刊：
影响因子：
5.3
通讯作者：
Wang, K.
中科院分区：
文献类型：
--
作者：
Li, X. G.;Ma, B. G.;Wang, K.
通过热重分析，在非等温条件下研究了金属氧化物（氧化铜、氧化铁和氧化锌）对高灰分煤燃烧行为的催化作用。实验在从环境温度到1000摄氏度的范围内进行，升温速率为20摄氏度/分钟。采用着火温度、燃尽性能和放热行为来评估催化效果。此外，使用科茨 - 雷德弗恩（Coats - Redfern）方法确定了动力学参数（活化能和指前因子）。结果表明，与高灰分煤的燃烧特性相比，添加金属氧化物的样品着火温度降低了8 - 50摄氏度。金属氧化物能够加快固定碳的燃烧速率和燃尽。添加金属氧化物的样品放热量增加了15 - 30%，这可能是由于金属氧化物对固定碳燃烧的催化作用。样品的活化能降低，并且活化能和指前因子之间存在线性关系（lnA = 0.2683×E - 12.807）。
By means of thermogravimetric analysis, the catalytic effect of metallic oxides (CuO, Fe2O3, and ZnO) on the combustion behavior of high-ash coal was investigated under nonisothermal conditions. Experiments were conducted from ambient temperature to 1000 degrees C at a heating rate of 20 degrees C-min(-1). The ignition temperature, burnout performance, and exothermic behavior were used to evaluate the catalytic effect. Moreover, the kinetics parameters (activation energy and pre-exponential factor) were determined using the Coats-Redfern method. It is indicated that, compared with the combustion characteristics of high-ash coal, the ignition temperature of the samples with metallic oxides decreases by 8-50 degrees C. Metallic oxides can speed up the combustion rate and burnout of the fixed carbon. The exothermic values of samples incorporating metallic oxides increase by 15-30%, which may be due to the catalytic effect of metallic oxides on fixed carbon combustion. The activation energies of the samples decrease, and there is a linear connection between the activation energies and pre-exponential factors (In A = 0.2683 x E-12.807).