高性能SCR喷氨混合技术研究与应用  

Research and application of high performance SCR ammonia injection and mixing technology

作　　者：严晓勇 谢新华 周健 李明磊 YAN Xiaoyong;XIE Xinhua;ZHOU Jian;LI Minglei(CHN Energy(Fuzhou)Thermal Power Ltd.,Fuqing 350309,China;Suzhou TPRI Energy&Environment Technology Co.,Ltd.,Suzhou 215153,China)

机构地区：[1]国能(福州)热电有限公司,福建福清350309 [2]苏州西热节能环保技术有限公司,江苏苏州215153

出　　处：《热力发电》2024年第7期129-134,共6页Thermal Power Generation

摘　　要：随着火电机组利用小时数不断下降,调峰日益频繁,现有喷氨混合技术已不能满足燃煤电厂新常态的需求,超低排放对SCR反应器入口NH3/NOx摩尔比分布均匀性提出了更高的要求。通过CFD数值模拟和物理模型试验,对格栅型AIG和静态混合器进行了优化研究,提出了保证喷氨格栅布氨均匀、调节灵活、抗堵灰的设计方法和防堵型AIG喷嘴,并研发出了一种三角形大范围烟气自混合装置,提高了SCR反应器入口NOx质量浓度场的均匀性,从根源上提升了SCR脱硝装置的负荷适应性。某2×600 MW机组的SCR脱硝装置采用本技术改造后,高中低负荷下SCR反应器出口NOx分布相对标准偏差达到了8%~19%,高负荷下氨逃逸下降了51%。The utilization hours of thermal power units continue to decline,and peak shavings become more frequent.Under this background,the existing ammonia injection mixing technology can no longer meet the new normal needs of coal-fired power plants,and ultra-low emissions put forward higher requirements for uniformity of the NH3/NOx molar ratio distribution at the SCR reactor inlet.The grid-type ammonia injection grid(AIG)and static mixer are optimized through CFD numerical simulation and physical model test.The design method and an anti-blocking nozzle are proposed to ensure the uniformity of ammonia distribution,adjustment flexibility,and antiblocking performance of the ammonia injection grid.Moreover,a triangular large-scale flue gas self-mixing device is developed to improve the uniformity of the NOx concentration field at inlet of the SCR reactor and enhance the load adaptability of the SCR denitrification device from the root.The relative standard deviation of NOx distribution at the SCR outlet of a 600 MW unit under high,medium and low loads reached 8%~19%by using this technology,and the ammonia escape at full load decreased by 51%.

关 键 词：燃煤电厂 脱硝 喷氨格栅 静态混合器 负荷适应性 

分 类 号：X773[环境科学与工程—环境工程]