Synergistic effects of different burner arrangements on combustion characteristics of 100MW boiler

Low nitrogen combustion constitutes a key technology for industrial pollution control and an important direction for clean energy utilization. This paper investigates different arrangements of burners, aiming to enhance combustion efficiency, and reduce NOx emissions. Through experimental verification and numerical simulation, the synergistic influences of the number of jet rows (N) and swirl deflection angle (θ) on the combustion and emission characteristics of a 100 MW opposed gas-fired boiler were analyzed. The results indicate that: N and θ jointly regulate the temperature distribution. An increase in N can lower the average temperature and shrink the high-temperature region, while a reduction in N will enhance the vortex intensity and the disorder of the flow field. When N = 3/4, increasing θ can reduce NOx emissions, while the opposite trend is observed when N = 2. Additionally, the swirl number (SN) along the furnace height exhibits a distribution pattern that transitions from negative to positive and then stabilizes near zero. Negative SN promote recirculation and flame stability, positive SN enhance turbulent mixing, and values approaching zero facilitate flame extension and temperature uniformity. The study provides a significant theoretical basis and engineering guidance for the combustion and NOx reduction optimization of opposed gas-fired boilers.