Numerical Simulation of Pulverized Coal Combustion in Raceway
ZHANG Shi-yang XUE Qing-guo LIU Jin-zhou SHE Xue-feng WANG Jing-song
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijin State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijin School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
Abstract：A mathematical model of gas-solid flow, heat transfer and pulverized coal combustion in the region of blowpipe-tuyere-raceway bottom was developed. Based on the technological parameters of practical blast furnace, the effects of coal particle size, oxygen enrichment and blast gas temperature on the burnout rate of pulverized coal were studied by numerical simulation. The results indicate that when the coal particle diameter changes from 120 to 70 μm, the burnout rate is increased by 35.928%, when the oxygen content in the blast gas is reduced from 30% to 21%, the burnout rate is decreased by 16.542%, and when the blast gas temperature is increased from 1423 to 1498 K, the burnout rate is raised by only 8.897%. Devolatilization process and oxygen availability are dominant factors for coal burnout. In addition, in examination of the influences of variables on pulverized coal burnout, the simulation region should include blowpipe, tuyere and raceway.
2014, Vol. 14 
