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《Chinese Journal of Engineering》 2017-06
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Performance of ventilation air methane combustion over transition metal oxide oxygen carriers

WU Ju-mao;SU Qing-quan;WU Yong-jian;YANG Hai-yang;School of Energy and Environmental Engineering,University of Science and Technology Beijing;Beijing Higher Institution Engineering Research Center of Energy Conservation and Environmental Protection,University of Science and Technology Beijing;  
The performance of combustion of ventilation air methane(VAM) over transition metal oxide oxygen carriers was studied through experiments with using tube reactors.The results show that the activity of activated oxygen carriers in converting CH_4 to CO_2 is as follows:CuO60/γ-Al_2O_3 Ni O60/γ-Al_2O_3 Fe2O360/γ-Al_2O_3.CH_4 conversion based on CuO60/γ-Al_2O_3 decreases with increasing gas hourly space velocity,but increases with increasing bed temperature and CuO loading.The lower the initial CH_4 concentration of ventilation air methane,the lower is the temperature for the CH_4 conversion of 90%.There are catalytic combustion mechanisms and chemical-looping combustion mechanisms for CH_4 combustion over both CuO60/γ-Al_2O_3,for which dispersion of the active component is low but loading is high,and CuO5.5/γ-Al_2O_3,for which dispersion of the active component is high but loading is low.There exists a maximum for CH_4 conversion based on the catalytic combustion mechanism at some temperatures,and when the bed temperature is higher than this temperature,the contribution of chemical-looping combustion is greater than that of catalytic combustion.The initial activity of CuO5.5/γ-Al_2O_3 is higher than that of CuO60/γ-Al_2O_3,while the stability of CuO60/γ-Al_2O_3 activity is better than that of CuO5.5/γ-Al_2O_3 activity under the same conditions.
【Fund】: 北京市科技基金资助项目(Z131100005613045)
【CateGory Index】: TD72
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