SCR区域喷氨的NH<sub>3</sub>分布与均匀性调整

陶莉; 肖育军

doi:10.12153/j.issn.1674-991X.20200196

SCR区域喷氨的NH₃分布与均匀性调整

doi: 10.12153/j.issn.1674-991X.20200196

陶莉^1,2,,
肖育军³

1.
高效清洁火力发电技术湖南省重点实验室
2.
国网湖南省电力有限公司电力科学研究院
3.
中国能源建设集团华中电力试验研究院有限公司

详细信息

作者简介:
陶莉(1971—),女,教授级高级工程师,博士,研究方向为燃煤烟气污染治理与控制技术、新材料研发和应用, 1135645231@qq.com

中图分类号: X701
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出版历程
- 收稿日期: 2020-08-05
- 刊出日期: 2021-07-20

NH₃ distribution and uniformity adjustment of ammonia spray in SCR area

TAO Li^{1,2
,},
XIAO Yujun³

1.
Hunan Province Key Laboratory of Efficient & Clean Thermal Power Generation Technology
2.
State Grid Hunan Electric Power Company Limited Research Institute
3.
China Energy Engineering Group Central China Electric Power Test and Research Institute Co., Ltd.

摘要

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NO_x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%。
- 数值模拟 /
- SCR脱硝 /
- 喷氨格栅 /
- 浓度分布
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 NO_x 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%.
- numerical simulation /
- SCR denitrification /
- ammonia injection grid /
- concentration distribution

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参考文献(19)

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