SCR脱硝塔流场均匀性分析及结构优化

发布时间：2018-04-27 16:00

本文选题：SCR脱硝塔 + 均匀性　；参考：《济南大学》2017年硕士论文

【摘要】：随着对于绿色经济的不断倡导和空气质量的越加重视,对于企业废气排放的标准在不断的提高,SCR脱硝塔在工业废气处理方面起到越来越重要的作用。由于塔身结构设计的局限,造成SCR脱硝塔内部流场不均匀,导致脱硝效率的低下和反应器设备使用寿命的缩减。因此,塔身流场结构的优化改进意义重大。本课题将39万m3/h SCR脱硝塔做为研究对象,以优化SCR脱硝塔设备的内部流场均匀性为目的,利用CFD流体仿真软件对SCR脱硝塔进行数值模拟,通过对原始模型的仿真分析,研究烟道内部流场分布情况,找出造成反应器内部流场偏差系数较大的原因,并分析其影响规律;针对SCR脱硝反应器出口结构对烟气均匀性的影响进行分析,设计了楔形导流板,通过调整楔形导流板的尺寸形状等参数,使得烟气在通过设备内部支撑立柱时扰流现象减轻,避免了对省煤器的冲击损坏,使得出口处的烟气偏差系数达到要求;根据原始模型的烟道速度场计算结果,在设计工况下,研究烟道导流板的数量和布置方式,整流格栅导流孔尺寸和高度对速度偏差系数的影响,综合考虑烟气在烟道运动、压力损失变化等情况,得到最佳的组合方式。通过对多种工况的研究分析,得到了SCR脱硝塔出入口、烟道弯头处以及整流格栅的整体优化方案。优化后的SCR脱硝塔内部流场均匀性得到了良好的改善,首层催化剂上方200mm处的烟气偏差系数低于15%,满足企业的生产要求。
[Abstract]:With the continuous promotion of the green economy and the increasing attention of the air quality, the SCR denitrification tower plays a more and more important role in the industrial waste gas treatment. Due to the limitation of the structural design of the tower, the flow field in the SCR denitrification tower is not uniform, which leads to the low and reverse efficiency of denitrification. Therefore, the optimization and improvement of the structure of the flow field of the tower body is of great significance. This subject takes 390 thousand m3/h SCR denitrification tower as the research object, in order to optimize the uniformity of the internal flow field of the SCR denitrification tower, and use the CFD fluid simulation software to simulate the SCR denitrification tower, and through the simulation analysis of the original model, This paper studies the distribution of flow field inside the flue, finds out the cause of the large deviation coefficient of the flow field inside the reactor and analyzes its influence law, analyzes the influence of the outlet structure of the SCR denitrification reactor on the uniformity of the flue gas, and designs the wedge-shaped diversion plate, by adjusting the parameters of the size and shape of the wedge guide plate, so as to make the flue gas pass through. When the equipment supports the column, the disturbing flow is reduced, the impact damage to the economizer is avoided and the gas deviation coefficient of the outlet is reached. According to the calculation results of the velocity field of the original model, the number and layout of the diversion plate are studied under the design condition, the size and height of the diversion hole of the rectifier grid are deviated from the velocity. The optimum combination method is obtained by considering the influence of the coefficient of the flue gas in the flue gas movement and the change of the pressure loss. Through the study and analysis of various working conditions, the overall optimization scheme of the SCR denitrification tower outlet, the pipe elbow and the rectifier grid is obtained. The optimization of the internal flow field uniformity of the SCR denitrification tower has been improved well, The flue gas deviation coefficient at 200mm above the first catalyst is less than 15%, which meets the production requirements of the enterprise.

【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X701

【参考文献】