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《Journal of Xi'an Jiaotong University》 2018-09
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Study of Diffusional Effect in Oxy-Fuel Combustion of Semi-Coke

TAO Zichen;WANG Chang'an;WANG Pengqian;YUAN Maobo;CHE Defu;State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University;  
To study the oxy-fuel(O2/CO2)combustion characteristics of semi-coke and analyze the diffusional effect,thermogravimetric analysis was used to explore the diffusional effect on the oxy-fuel combustion characteristics of semi-coke,and relevant kinetic analysis was performed.In addition,a mathematical model of oxygen diffusion rate in the reaction was established for analysis.The experiment investigated the combustion characteristics of semi-coke under changed conditions referring to the atmosphere,the height and diameter of crucible,and the mass of semicoke at different internal and external diffusion rates. The results of thermogravimetric experiments show that with the reduction of external diffusion distance in the combustion reaction and the thickness of the semi-coke bed as well as the increase of contact area with oxygen on the surface of semi-coke and the oxygen concentration in the reaction atmosphere,the diffusion resistance and burnout temperature are decreased,while the oxygen diffusion rate,average reaction rate,combustion characteristic index and activation energy are all increased,and the combustion characteristics are improved.The experimental results may provide a theoretical reference for the application of oxy-fuel combustion of semi-coke and the study of diffusional effect.
【Fund】: 国家重点研发计划资助项目(2017YFB0602003)
【CateGory Index】: TK16
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