锅炉脱硝稀释风源优化技术研究与应用

Research and application of boiler denitrification dilution air source optimization technology

针对锅炉脱硝稀释风系统中灰与氨气结晶物易堵塞喷氨支路阀门和喷嘴的问题,采用经热一次风加热后的冷一次风作为稀释风源替代原空预器出口热一次风,并分析其经济性与可行性。结果显示:稀释风系统改造后,气气换热器(GGH)出口稀释风温远超过200℃并且不超过320℃,满足尿素水解产品对稀释风温度的要求;解决了喷氨格栅堵塞问题,喷氨管路喷氨均匀性得到改善,系统总氨耗量下降,经济性得到提高。

Aiming at the problem that the ash and ammonia crystals in the boiler denitrification dilution air system of the boiler are easy to block the valves and nozzles of the ammonia injection branch,the cold primary air heated by the hot primary air is used as the dilution air source to replace the hot primary air at the outlet of the original air preheater,and its economy and feasibility were analyzed.The results show that after the dilution air system is reformed,the temperature of the dilution air at the outlet of the gas-gas heat exchanger(GGH)far exceeds 200℃and does not exceed 320℃,which meets the requirements of the urea hydrolyzed product for the dilution air temperature.The blockage of the ammonia injection grille is solved.The uniformity of ammonia injection in the ammonia injection pipeline is improved,the overall ammonia consumption of the system is reduced,and the economy is improved.