Compared with air-fuel combustion, the discharging slab temperature reached a growth of 2.9% in oxygen-enriched combustion. The maximum flame temperature and the average temperature of the furnace atmosphere increased from 2046 to 2175 K and from 1241 to 1279 K for increased oxygen concentration, respectively. Additionally, with this model, the effects of oxygen-enriched combustion with 74 vol % N 2 and 26 vol % O 2 in the oxidizer and inlet-change case with a fuel inlet and a primary air inlet on the performance of an indirect reheating furnace with pulse combustion were specially studied. Through experimental validation, the simulation results of the developed model using the EDC model with the four-step mechanism showed a good agreement with the experimental results. Thus, the EDC model with the four-step mechanism was selected as the ideal combustion model used for further simulation research. However, the calculation time of the EDC model with the four-step mechanism was reduced significantly. In a simulation with the eddy dissipation concept (EDC) model, results from the four-step mechanism were in close accordance with those of the GRI 3.0 mechanism, and both mechanisms could describe the combustion process in detail. Indirect heat transfer in the furnace was realized by coupling the radiant tubes and the furnace as a whole. To realize the pulse combustion process, a pulse control approach based on a user-defined function (UDF) was proposed to control the radiant tube burner state. In this paper, a comprehensive numerical model is developed to characterize the combustion, heat transfer, and slab heating in an indirect reheating furnace with pulse combustion. For this purpose, it is necessary to establish a model suitable for industrial production and adjust it according to industrial demand.
The requirement of improving efficiency and performance leads to the continuous development of furnaces and burners.
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