Abstract
Low nitrogen combustion has always been an essential topic in energy conservation and environmental protection. This paper proposes a new type of low-nitrogen burner, which aims to optimize the burner structure and reduce NOx emission. Fuel and air staged combustion and central swirl technology are adopted in the burner to reduce local high-temperature areas and NOx generation. The effects of the new low-nitrogen burner's structural parameters and operating parameters on the temperature distribution, velocity distribution and NOx concentration distribution in the furnace are analyzed by cold state experiment and numerical simulation. The results show that: the cyclone blade deflection angle of 30 and the main combustion stage gas nozzle of 3 are the optimal structural parameters. The secondary combustion stage gas ratio of 0.1, the excess air coefficient of 1.05, and the air preheating temperature of 298 K are the optimal working condition parameters. At this moment, the furnace has the highest average temperature, the best combustion efficiency and the lowest NOx emission. These indicates that the novel low-nitrogen burner can be a suitable device for reducing NOx emission.
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