Dynamic Ammonia Spray Aperture for SCR Denitrification

The patent applies the dynamics principle by replacing the fixed steel-made spray grille and nozzle with a movable sliding block structure that can dynamically adjust the aperture opening degree. The sliding block moves along the aperture under the action of flue gas flow force, automatically changing the ammonia spray amount to match the fluctuating flue gas flow rate, thus resolving the contradiction between adaptability and structural simplicity.

The patent applies the preliminary action principle by using the flue gas flow rate as a leading indicator to adjust the ammonia spray amount before the nitrogen oxide concentration actually changes. Since the flue gas flow rate directly affects the required ammonia amount, adjusting based on this real-time parameter eliminates the time delay inherent in measuring nitrogen oxide concentration and then adjusting, achieving proactive rather than reactive control.

The patent applies the feedback principle by creating a closed-loop control system where the flue gas flow rate serves as the feedback parameter. The sliding block's position is automatically adjusted based on the real-time flue gas flow rate, which in turn controls the ammonia spray amount. This continuous feedback mechanism ensures the ammonia spray amount precisely matches the actual demand, preventing both excessive spray (which causes ammonium bisulfate deposition) and insufficient spray (which reduces nitrogen oxide reduction efficiency).