NH3 distribution and uniformity adjustment of ammonia spray in SCR area
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摘要: 针对SCR系统区域喷氨优化调整原理的具体实施,用仿真技术建立典型SCR系统数值模型,研究喷氨格栅支管所喷NH3在出口监测截面上的区域分布与迹线运动;对比分析不同处理烟气量下喷氨格栅区域烟气速度、NH3浓度以及调整前后出口监测截面上NH3浓度分布。结果表明:均匀划分后的出口截面与喷氨支管间区域的正对应关系受支管的位置与烟道结构的影响而发生不规律的改变,增加了依据出口区域NOx浓度进行支管喷氨量调整的复杂性;横向分区支管的喷氨迹线被导流板结构限定在对应区域内,纵向分区支管的喷氨迹线随烟气产生向一侧偏移的趋势。调整前,50%、75%、100%烟气处理量下出口截面S-2上NH3浓度相对标准偏差分别为19.79%、19.23%、17.17%,不因处理烟气量不同而显著改变;调整后,其相对标准偏差为3.8%。Abstract: Aiming at the specific implementation of the principle of the ammonia injection optimization and adjustment for Selective Catalytic Reduction (SCR) system, a numerical model of a typical SCR system was established by the simulation method to study the regional distribution of NH3 on the export monitoring section and the pathlines of NH3 in the device, which was injected by the ammonia sprayed branch pipe. The flue gas velocity and NH3 concentration at the ammonia sprayed grid area were analyzed under different flue gas volumes. Furthermore, the distributions of NH3 concentration on the export monitoring section before and after adjustment was compared and analyzed. The results showed that there occurred irregular changes for the positive correspondence between the outlet sections which was evenly divided and the ammonia injection branch pipes, due to the influence of the position of the branch pipe and the structure of the flue. The irregular correspondence increased the complexity of adjusting the amount of ammonia injection of the corresponding branch pipe according to NOx concentration in a separate area on the outlet section. The pathlines of ammonia sprayed by the lateral partitioned branch pipes were limited in the corresponding region by the deflector structures, while the pathlines of ammonia sprayed by the vertical partitioned branch pipes had a tendency to shift to the one side with the flue gas. Under the condition of the uniform ammonia injection, the relative standard deviations of NH3 concentration on the section S-2 under the 50%, 75%, and 100% flue gas treatment volume was 19.79%, 19.23%, and 17.17%, respectively, which did not changed significantly due to the changes of the flue gas treatment volume. After optimization adjustment, the relative standard deviations of NH3 concentration on the section S-2 was 3.8%.
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