CFD Research And Hot Performance Test Of A New Reburning Burner With Low NOx Emission

Nitrogen oxide is a huge threat towards environmental safety and the combustion process of tube heating furnace. In order to design a new furnace burner with lower NO emission, CFD software Fluent was used to study the effect of structural factors including the relative height between primary gas gun and staged gas gun(H), the primary gun spraying angle (a),the staged gun spraying angle (β.γ) on the burner NO emission based on response surface methodology (RSM) and central composite design(CCD). A mathematical model was derived by RSM for the prediction of NO emission and ridge analysis was employed for the optimal parameters. The results showed that H and ft played main roles on the NO generation while effects of a and γ were negligible. Finally, the optimization structure of H 140 mm, a89°,β29° and y 92° was simulated and NO emission at the burner exit turned out to be 31.7μL·L-1,which agreed well with the prediction value and indicated that the application of RSM for burner structural optimization is practical. Hot test of the optimal burner was also carried on to analyze the burning performance, while the comparison between CFD result and the hot test result verified the accuracy of CFD simulation.