Research Article
Numerical Study of the Effect of Air-Fuel Ratio (AFR) on Flow and Combustion Characteristics in Burners Tangentially Fired Pulverized Coal Boiler
@INPROCEEDINGS{10.4108/eai.3-10-2024.2356255, author={Dwi Novianti and Arrad Ghani Safitra and Lohdy Diana}, title={Numerical Study of the Effect of Air-Fuel Ratio (AFR) on Flow and Combustion Characteristics in Burners Tangentially Fired Pulverized Coal Boiler}, proceedings={Proceedings of the 3rd International Conference on Contemporary Risk Studies, ICONIC-RS 2024, 3 October 2024, Surakarta, Indonesia}, publisher={EAI}, proceedings_a={ICONIC-RS}, year={2025}, month={9}, keywords={combustion efficiency; tangentially fired pulverized coal boiler; computational fluid dynamics; air-fuel ratio; fire-ball}, doi={10.4108/eai.3-10-2024.2356255} }- Dwi Novianti
Arrad Ghani Safitra
Lohdy Diana
Year: 2025
Numerical Study of the Effect of Air-Fuel Ratio (AFR) on Flow and Combustion Characteristics in Burners Tangentially Fired Pulverized Coal Boiler
ICONIC-RS
EAI
DOI: 10.4108/eai.3-10-2024.2356255
Abstract
A 3D numerical simulation analyzed combustion in a pulverized coal boiler with tangential firing, optimizing mixing for more complete combustion. Adjusting the air-fuel ratio (AFR) was vital, with AFR values of 5.84, 6.15, 6.47, 6.79, 7.44, and 8.09. Computational Fluid Dynamics (CFD) investigated velocity, temperature, and O2, CO2, and CO species distributions. Standard k-ε turbulence modeling, a discrete phase model for coal particles, a species transport model for combustion, and a Discrete Ordinates model for radiation were employed. Results showed turbulent flow and ideal particle trajectories in the burner. Higher AFR increased flue gas velocity but decreased temperature. At AFR 5.84, O2 was lowest and CO2 highest, indicating optimal stoichiometric oxidation. Extremes in AFR caused unburned carbon due to poor air-coal mixing. AFR 5.84 was identified as optimal for efficient combustion.
