I. Project Introduction 1. Introduction to the Low-Nitrogen Burner Retrofit Project Current low-nitrogen combustion technology solutions: ① Air staging + rich and lean; ② Operation: Reduce outlet O2 concentration; ③ Problems caused: Slagging, high-temperature corrosion; Increase in carbon content in fly ash. Xi'an Jiaotong University's core low-nitrogen technologies: ① Coal powder rapid ignition technology under low oxygen conditions; ② Low momentum cutting circle design technology. 2. Market Prospect and Application 2. Coal Powder Intelligent Combustion System Measures: Primary air powder quantity/air volume measurement, secondary air volume measurement, online measurement of wind-coal ratio; Online monitoring indicators for the water wall surface reducing atmosphere: ① Relative reduction in NOx emissions at the furnace outlet by more than 10%. ② Boiler efficiency increased by more than 0.5-1%. ③ System availability rate above 95%. 3. Air Preheater Anti-Blockage Device In order to meet environmental protection standards, excessive ammonia spraying leads to high SCR ammonia slip. NH4HSO4 deposits are formed on the cold end of the air preheater. Blockage of the air preheater. Solution - Hot air self-circulation: Utilize the pressure difference (around 6-8 kPa) between the hot primary air outlet duct and the cold secondary air inlet duct of the air preheater to achieve the self-recirculation of hot primary air. By arranging a hot air lance at the cold end of the heat exchange elements, it heats and blows to clean the cold end of the heat exchange elements, achieving the purpose of removing NH4HSO4. 4. Optimization of denitrification system and flue gas resistance reduction (1) SCR optimization and transformation content: ① SCR inlet duct flow field optimization - Add guide vanes ② Bidirectional adjustable ammonia spray grid - Transform nozzles ③ Ammonia-flue gas turbulent mixer ④ SCR outlet full cross-section multi-point sampling device ⑤ Multi-objective coordinated control of ammonia spraying - Intelligentization (2) Market prospects and applications 5. Fan energy saving transformation technology (1) Best solution for fan transformation: ① First conduct experiments to obtain the system resistance characteristic curve. ② Transform the impeller and blade shape, while retaining the motor, foundation, The casing and transmission group remain unchanged. The rational matching of fans and water pumps is resolved to ensure that the operating points of fans and water pumps are in the high-efficiency zone. (3) Finally, a high-quality frequency converter is installed to replace the baffle flow control. (2) Fan Retrofit and Optimization Project Performance Table (over 40 achievements) 6. The fan operation online monitoring and fault early warning system changes the current regulation method of both sides' fan airflows to a volume regulation method; automatically balances the flue gas volumes on both sides of the furnace outlet, reducing deviations in furnace outlet smoke temperature and ambient temperature; automatically balances the flue gas volumes on both sides of the SCR and dust collectors. The monitoring system dynamically displays online the fan operation curve, operating point position, stall safety margin, and resistance of the flue gas system. Intelligent diagnostic and early warning prevent wind grabbing, effectively improving the operational safety of the fan system.