YOYO Environmental Protection's superior flow field design eliminates the need for additional induced draft fans and increases boiler pressure, saving the owner significant energy. This fully automatic intelligent system precisely measures the amount of reducing agent injected by measuring flue gas flow, temperature, NOx concentration, pressure, and target denitrification rate. Injection automatically stops if the urea level or compressed air pressure is low. In the event of a power outage, compressed air outage, or compressed air shutoff, the spray gun automatically purges to prevent clogging and resumes operation once normal operation is restored. The system also features self-diagnostic fault monitoring, allowing real-time monitoring of operating status.