Numerical simulation of bituminous coal combustion in a fullscale tiny-oil ignition burner： Influence of excess air ratio

• Published in: Frontiers in Energy Vol. 6; no. 3; pp. 296 - 303
• Main Authors: Li, Zhengqi, Liu, Chunlong, Zhang, Xiang, Zeng, Lingyan, Chen, Zhichao
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Higher Education Press 01.09.2012; Springer Nature B.V
• Subjects: Air flow; Coal; Combustion; Energy; Energy Systems; Experiments; Fuels; High temperature; Oil; Radiation; Ratios; Research Article; Simulation; Statistical analysis; Temperature; 数值模拟; 点火燃烧器; 煤燃烧; 电站锅炉; 空气过剩率; 空气速度; 过量空气系数; 量程; tiny-oil ignition burner; pulverized coal; numerical simulation; temperature field
• ISSN: 2095-1701; 2095-1698
• DOI: 10.1007/s11708-012-0191-0

The progression of ignition was numerically simulated with the aim of realizing a full-scale tiny-oil ignition burner that is identical to the burner used in an 800 MWe utility boiler. The numerical simulations were conducted for four excess air ratios, 0.56, 0.75, 0.98 and 1.14 （corresponding to primary air velocities of 17, 23, 30 and 35 m/s, respectively）, which were chosen because they had been used previously in practical experiments. The numerical simulations agreed well with the experimental results, which demonstrate the suitability of the model used in the calculations. The gas temperatures were high along the center line of the burner for the four excess air ratios. The flame spread to the bumer wall and the high- temperature region was enlarged in the radial direction along the primary air flow direction. The O2 concentrations for the four excess air ratios were 0.5%, 1.1%, 0.9% and 3.0% at the exit of the second combustion chamber. The CO peak concentration was very high with values of 7.9%, 9.9%, 11.3% and 10.6% for the four excess air ratios at the exit of the second combustion chamber.