SCR系统急转烟道均流装置的数值模拟  

Numerical simulation on a new type sharp bend flue equalizing device in SCR system of a 350 MW unit boiler

作　　者：张波[1] 牛国平[1] 王月明[1] 马建兰[1] 王晓冰[1] 董陈[1] 罗志[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032

出　　处：《热力发电》2014年第4期87-94,共8页Thermal Power Generation

摘　　要：通过数值模拟的方法,对某电厂锅炉烟气脱硝改造工程SCR系统流场进行优化时发现,由于该机组空气预热器(空预器)的烟气侧和空气侧为左右布置,且锅炉后部受热面前后竖井烟温偏差达60℃,导致催化剂来流烟气在宽度方向上存在40℃温差。对此,通过采用急转烟道均流装置,将SCR反应器入口扁平烟道宽度方向的温度偏差,转变为烟道高度方向的温度偏差,增加了冷、热烟气的接触面积,强化了冷、热烟气的混合效果。数值模拟和模型试验研究表明:应用急转烟道均流装置的SCR系统,催化剂来流温度偏差仅为7℃,其他各项技术指标也均满足要求。By numerical simulation, the flow field in SCR denitrifcation reactor of a power plant boiler was investigated. Because the flue gas side and air side of the air preheater is leftright ar ranged,and the temperature difference of flue gas in vertical shaft around the heating surface at post part of the boiler is 60 ℃, the temperature difference of flue gas mixed with catalyst in width direction reaches 40 ℃. The patented technology.uniform flow device for sharp bend flue,can en large the contact area and improve the mixing effect of cold and hot flue gas. The numerical simu lation and model test results show that,in SCR system equipped with the uniform flow device for sharp bend flue,the temperature deviation of the catalyst flow decreases to 7 ℃. Moreover, the other technical indexes also meet the requirements.

关 键 词：350 MW机组 SCR反应器 急转烟道均流装置 数值模拟 模型试验 

分 类 号：X51[环境科学与工程—环境工程]