摘要
逃逸氨与烟气中的SO3反应生成NH4HSO4后容易对下游设备运行造成影响,这与氨的利用率不均匀直接相关。以某300MW火电机组SCR脱硝改造工程为研究对象,采用CFD数值模拟方法对其流场进行了诊断,提出了流场优化设计方案,对比了优化前后的流场和氨逃逸变化情况。结果表明:通过设计合理的导流措施和喷氨混合措施,SCR脱硝装置内速度场、浓度场等流场分布得到了明显的改善,脱硝效率得到了较大的提高,氨逃逸也得到了明显的抑制,从定性和定量上解释了流场设计对脱硝系统性能的影响作用。可为SCR脱硝系统氨逃逸的诊断和改造措施提供借鉴意义。
Escape ammonia reacts with the SO3 in flue gas to produce NH4HSO4,that easy to affect downstream equipment operation,which is directly related to the uneven utilization rate of ammonia.Taking a 300MW SCR denitration transformation project for thermal power unit as the research object,diagnosing its flow field by CFD numerical simulation method,proposing its flow field optimization design scheme,and comparing its flow field and ammonia escape changes before and after optimization.The results show that with the reasonable design of diversion and ammonia injection measures,the distribution of velocity field,concentration field and other flow fields in SCR reactor get obvious improvement,denitration efficiency improves greatly,ammonia escape have obvious inhibition.The influence of flow field design on the performance of SCR reactor is explained qualitatively and quantitatively.It can provide reference for the diagnosis and reconstruction of ammonia escape in SCR denitration system.
作者
张楚城
叶兴联
苏寅彪
杨丁
ZHANG Chucheng;YE Xinglian;SU Yinbiao
出处
《电力科技与环保》
2019年第3期13-17,共5页
Electric Power Technology and Environmental Protection
基金
国家重点研发计划(2016YFC0203703)
龙岩市基础研究与青年人才项目(2017LY82)
关键词
SCR脱硝
流场优化
数值模拟
氨逃逸
SCR reactor
flow field optimization
numerical simulation
ammonia escape
