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Numerical study on characteristics of combustion and pollutant formation in a reheating furnace

Qi Fengsheng (Northeastern University, School of Metallurgy, Shenyang, China)
Wang Zisong (Northeastern University, School of Metallurgy, Shenyang, China)
Li Baokuan (Northeastern University, School of Metallurgy, Shenyang, China)
He Zhu (Wuhan University of Science and Technology, Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan, China)
Baleta Jakov (University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Department of Energy, Power Engineering and Environment, Zagreb, Croatia)
Vujanović Milan (University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Department of Energy, Power Engineering and Environment, Zagreb, Croatia)

Energy consumption of fuel-fired industrial furnace accounts for about 23% of the national total energy consumption every year in China. Meanwhile, the reduction of combustion-generated pollutants in furnace has become very important due to the stringent environment laws and policy introduced in the recent years. It is therefore a great challenge for the researchers to simultaneously enhance the fuel efficiency of the furnace while controlling the pollution emission. In this study, a transient 3-D mathematical combustion model coupled with heat transfer and pollution formation model of a walking-beam-type reheating furnace has been developed to simulate the essential combustion, and pollution distribution in the furnace. Based on this model, considering nitrogen oxides formation mechanism, sensitivity study has been carried out to investigate the influence of fuel flow rate, air-fuel ratio on the resultant concentration of nitrogen oxides in the flue gas. The results of present study provide valuable information for improving the thermal efficiency and pollutant control of reheating furnace.

Keywords: energy consumption, reheating furnace, combustion, pollutant formation, nitrogen oxides emissions