摘要
安徽芜湖电厂2~#炉喷氨格栅采用分区控制式喷射技术。由于格栅阀门开度、浓度场、速度场三者之间耦合较差,导致反应器出口烟道NH_3/NO_x分布极不均匀,实测NO_x最大偏差达74.7 mg·m^(-3),NH_3逃逸率最高达11.4μL·L^(-1),下游空气预热器安全运行受到严重影响。基于全区域NH_3/NO_x等摩尔比理念,并综合考虑该反应器入口的浓度场和速度场状况进行喷氨格栅优化。调整后,在660、500、330 MW3种典型工况下,NO_x浓度最大偏差分别降至5.8、10.3、11.8 mg·m^(-3),NH_3逃逸率由调前的4.64μL·L^(-1)分别降至调后的2.67、3.03、2.14μL·L^(-1)。系统总效率基本不变,但效率峰谷差异下降明显。
The ammonia-injection grid （AIG） of the No. 2 boiler in Anhui Wuhu Power Plant uses partition controlled injection technology. Due to the poor coupling of the valve opening of the AIG in relation to the con- centration and velocity conditions, the NH3/NOx concentration distribution of the reactor outlet was extremely un- even. The maximum deviation of measured NOx reached 74.7 mg · m^-3, and the highest escape rate of NH3 soared to 11.4 μL · L^-1. Therefore, the safe operation of the air pre-heater was severely affected. This study presents the optimization of the AIG system based on the concept of full area equal NH3/NOx molar, and compre- hensively considers both the concentration field and velocity field conditions in the reactor. After adjustments, the maximum deviations of NOx concentration were reduced to 5.8,10.3 ,and 11.8 mg· m ^-3 under the three typical conditions of 660,500,and 330 MW,respectively. The escape rate of NH3 dropped to 2.67,3.03, and 2.14 μL · L^-1 from the previous 4. 64 μL · L^-1. The total in efficient peaks decreased significantly. efficiency of the system remains unchanged, but the difference
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第5期2915-2919,共5页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51302135)
江苏省高校科研成果产业化推进项目(JHZD2012-7)
