基于流场诊断的燃煤电站SCR系统喷氨优化及试验验证
发布时间：2018-12-13 22:35
【摘要】：为实现SCR系统的安全高效运行,采用CFD数值模拟技术开展660 MW燃煤电站SCR系统流场优化.根据喷氨格栅前烟气流动特性解析喷氨支管阀门权重,基于权重阀开展喷氨优化研究.分析了优化前后首层催化剂入口截面烟气速度/浓度分布特性,搭建冷态模化试验装置对数值模拟研究结果进行验证.研究结果表明:导流板合理优化布置可有效改善流场分布的均匀性,速度标准偏差可相对减少约71.30%;基于权重阀优化喷氨使喷氨特性与烟气流动特性匹配良好,改善了浓度分布的均匀性,浓度标准偏差相对减少约24.95%;冷态模化试验值与数值模拟值吻合良好,两者偏差仅为3.08%;流场/权重阀喷氨优化协同作用能够最大限度提升燃煤电站SCR系统的工作性能.
[Abstract]:In order to realize the safe and efficient operation of SCR system, CFD numerical simulation technology is used to optimize the flow field of SCR system in 660 MW coal-fired power station. According to the characteristics of flue gas flow in front of ammonia spray grille, the weight of ammonia injection branch valve was analyzed, and the optimization of ammonia injection was carried out based on weight valve. The characteristics of flue gas velocity / concentration distribution in the inlet section of the first layer catalyst before and after optimization were analyzed and the numerical simulation results were verified by building a cold model test device. The results show that the optimum layout of the diversion plate can effectively improve the uniformity of the flow field distribution, and the velocity standard deviation can be reduced by about 71.3030. Based on the weight valve optimization of ammonia injection, the characteristics of ammonia injection and flue gas flow are matched well, the uniformity of concentration distribution is improved, and the standard deviation of concentration is reduced by 24.95%. The cold model test results agree well with the numerical simulation values, and the deviation between them is only 3.08. The optimized synergy of flow field / weight valve ammonia injection can improve the working performance of SCR system in coal-fired power plant to the maximum extent.
【作者单位】： 东南大学能源热转换及其过程测控教育部重点实验室;
【基金】：江苏省科技厅社会发展类资助项目(BE2015677)
【分类号】：X773
，
本文编号：2377372
[Abstract]:In order to realize the safe and efficient operation of SCR system, CFD numerical simulation technology is used to optimize the flow field of SCR system in 660 MW coal-fired power station. According to the characteristics of flue gas flow in front of ammonia spray grille, the weight of ammonia injection branch valve was analyzed, and the optimization of ammonia injection was carried out based on weight valve. The characteristics of flue gas velocity / concentration distribution in the inlet section of the first layer catalyst before and after optimization were analyzed and the numerical simulation results were verified by building a cold model test device. The results show that the optimum layout of the diversion plate can effectively improve the uniformity of the flow field distribution, and the velocity standard deviation can be reduced by about 71.3030. Based on the weight valve optimization of ammonia injection, the characteristics of ammonia injection and flue gas flow are matched well, the uniformity of concentration distribution is improved, and the standard deviation of concentration is reduced by 24.95%. The cold model test results agree well with the numerical simulation values, and the deviation between them is only 3.08. The optimized synergy of flow field / weight valve ammonia injection can improve the working performance of SCR system in coal-fired power plant to the maximum extent.
【作者单位】： 东南大学能源热转换及其过程测控教育部重点实验室;
【基金】：江苏省科技厅社会发展类资助项目(BE2015677)
【分类号】：X773
，
本文编号：2377372
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