When the fuel with a high N content is used, it is often used together with the two-stage combustion method. According to the information, when the flue gas recirculation rate is 20%, the NOx suppression effect is good, and the NOx emission concentration can be lower than 80mg/kg.
Finally, let’s talk about the split flame type low-nitrogen burner. The principle is to divide a large flame into several small flames. Due to the large heat dissipation surface of the small flame, the flame temperature decreases, which reduces the temperature type NOx; in addition, the flame becomes smaller, It shortens the residence time of nitrogen, oxygen and other gases in the flame, and has a significant inhibitory effect on temperature-type NOx or fuel-type NOx. Split (divided) burners and mechanical atomized fuel injectors. Near the nozzle, the flame collides with several rod-like objects and divides into several strands; internal mixing steam atomized fuel injectors use several nozzles to generate several strands Burning flames. Experiments have proved that these two types of burners not only produce lower NOx, but also lower soot concentration. The NOx emission concentration is also extremely low, 35mg/kg for mechanical atomization split combustion and 42mg/kg for steam atomization split combustion.
