Optimization of ammonia injection grid in SCR denitrification reaction system based on response surface method
YE Meng-meng1, QIAN Fu-ping1, WANG Lai-yong1, XU Bing2, HUANG Nai-jin2, WU Hao2
1. School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan 243032, China; 2. Anhui Weida Environment Protection Science & Technology Co., Ltd., Hefei 230041, China
Abstract：Based on the computational fluid dynamics (CFD) method, the k-e turbulence model and component transport model were used to simulate the ammonia concentration field in SCR denitrification reactor. The accuracy of the numerical simulation of ammonia concentration field in the reactor was verified by experiments. The influence of ammonia injection grid structural parameters and system operation parameters on ammonia concentration field in SCR denitrification reactor was studied. The results indicated that the nozzle density N, the opening ratio ψ, the nozzle angle α and the inlet wind velocity v all had some influence on the ammonia concentration distribution uniformity, and the significance of the influence was n > α > V > ψ. The optimum structure parameters and system operation parameters were obtained, and the corresponding nonuniform coefficient of ammonia concentration distribution was 0.0151. The optimum structure parameters were:r=8, d=57mm, α=90°, and the optimum operation parameters of the system were v=8.17m/s.
吕鲲,张庆竹.纳米二氧化钛光催化技术与大气污染治理[J]. 中国环境科学, 2018,38(3):852-861. Lv K, Zhang Z Q. Nano-TiO2 photocatalytic technology and atmospheric pollution control[J]. China Environmental Science, 2018, 38(3):852-861.
[2]
杜振.湿式氨法烟气脱硫脱硝过程中的NOx吸收的试验研究[D]. 杭州:浙江大学, 2011. Du Z. Study of NO absorption in ammonia-based wet flue gas desulfurization and denitrification process[D]. Hang Zhou:Zhe Jiang University, 2011.
Feng Y SH, Zhang X H, Lv Y F, et al. Performance evaluation of two flue gas denitration systems in China using an emergy-based combined approach[J]. Journal of Cleaner Production, 204:803-818.
[5]
付金艳,王振峰,白心蕊,等. γ-Al2O3酸性修饰稀土尾矿NH3-SCR脱硝性能[J]. 中国环境科学, 2020,40(9):3741-3747. Fu J Y, Wang Z F, Bai X R, et al. Denitration performance of NH3-SCR from γ-Al2O3 acid modified rare earth tailings[J]. China Environmental Science, 2020,40(9):3741-3747.
[6]
杨忠凯,武宁,何如意,等.燃煤烟气同时脱硫脱硝技术研究进展[J]. 应用化工, 2020,49(5):1219-1225. Yang Z K, Wu N, He R Y, et al. Research progress on simultaneous desulfurization and denitrification technology for coal fired flue gas[J]. Applied Chemical Industry, 2020,49(5):1219-1225.
[7]
陆续,吴庆龙,张向宇,等.高温还原区喷氨脱硝试验研究[J]. 动力工程学报, 2020,40(6):481-485,501. Lu X, Wu Q L, Zhang X Y, et al. Experimental research on denitrification process by reagent Injection in the high temperature reduction zone[J]. Journal of Chinese Society of Power Engineering, 2020,40(6):481-485,501.
[8]
Sayre A N, Milobowski M G. Validation of numerical model of flow through SCR units[C]//Washington D.C.:EPRI-DOE-EPA Combined Units, 1999.
[9]
Rogers K, Nolan P S. SCR reactor performance profiling and results analysis[C]//Chicago:The EPA-DOE-EPRI Combined Power Plant Air Pollutant Control Symposium "The Mega Symposium", 2001.
[10]
王为术,上官闪闪,张斌,等.300MW亚临界机组SCR脱硝系统数值模拟[J]. 洁净煤技术, 2015,21(6):79-82. Wang W S, ShangGuan S S, Zhang B, et al. Numerical simulation of SCR denitrification system for a 300MW subcritical unit[J]. Clean Coal Technology, 2015,21(6):79-82.
[11]
Jin M C, Sung H H. Application of computational fluid dynamics analysis for improving performance of commercial scale selective catalytic reduction[J]. Korean Journal of Chemical Engineering, 2006,23(1):43-56.
[12]
方朝君,金理鹏,宋玉宝,等.SCR脱硝系统喷氨优化及最大脱硝效率试验研究[J]. 热力发电, 2014,43(7):157-160. Fang Z J, Jin L P, Song Y B, et al. Performance optimization and maximum denitration efficiency analysis for SCR-DeNOx power plants[J]. Thermal Power Generation, 2014,43(7):157-160.
[13]
宋玉宝,赵鹏,姚燕,等.SCR脱硝不均匀反应宏观模型研究[J]. 中国电力, 2019,52(5):176-184. Song Y B, Zhao P, Yao Y, et al. Study on the macro non-uniform catalytic De-NOx reaction model for SCR System[J]. Electric Power, 2019,52(5):176-184.
[14]
Adams B, Senior C. Improving design of SCR system with CFD modeling[C]//sburgh:DCE Environment Controls Conference, 2006.
[15]
王乐乐,孔凡海,何金亮,等.超低排放形势下SCR脱硝系统运行难点与对策[J]. 热力发电, 2016,45(12):19-24. Difficulties and countermeasures of SCR denitration system operation in ultra low emission situation[J]. Thermal Power Generation, 2016, 45(12):19-24.
[16]
Xiao Y J, Zhou Y H, Zhou X B, et al. Effect of performance and installation of ammonia branch on distribution of NOx concentration uniformity[J]. Journal of Environmental Engineering Technology, 2018,8(3):327-334.
[17]
叶玉奇,钱付平.基于响应曲面法袋式除尘器清灰性能的数值研究[J]. 环境科学学报, 2012,32(12):3087-3094. Ye Y Q, Qian F P. Numerical study of the bag filter dust cleaning performance using response surface methodology[J]. Acta Scientiae Circumstantiae, 2012,32(12):3087-3094.
[18]
Zhu X J, Qian F P, Lu J L. Numerical study the solid volume fraction and pressure drop of the fibrous media based on SEM using response surface methodology[J]. Chemical Engineering & Technology, 2013,36(4):1-8.
[19]
汪鑫.低温SCR反应器的优化设计与仿真模拟研究[D]. 北京:华北电力大学, 2017. Wang X. Optimal design and Simulation of low temperature SCR reactor[D]. Beijing:North China Electric Power University, 2017.
[20]
陈鸿伟,徐继法,王广涛,等.烟气飞灰对SCR脱硝催化剂磨损数值模拟[J]. 动力工程学报, 2019,39(2):148-154. Chen H W, Xu J F, Wang G T, et al. Numerical simulation on the erosion of SCR denitration catalysts by flue gas fly ash[J]. Journal of Chinese Society of Power Engineering, 2019,39(2):148-154.
[21]
肖育军,邹毅辉,李彩亭,等.SCR系统结构模型与数值模型的适用性分析[J]. 中国电力, 2019,52(3):146-152,160. Xiao Y J, Zou Y H, Li C T, et al. Comprehensive diagnosis and closed loop optimization of NOx ultra-low emission of SCR[J]. Electric Power, 2019,52(3):146-152,160.
[22]
Blazek J. Computational fluid dynamics:Principles and applications (Second Edition)[M]. Elsevier, 2005.
[23]
ANSYS, Inc. ANSYS Fluent User' Guide[M]. Southpointe 275 Technology Drive Canonsburge PA 15317; USA, 2010.
[24]
张鹏,周俊杰.火电厂SCR反应器脱硝性能数值模拟研究[J]. 工业技术创新, 2016,12(1):13-18. Zhang P, Zhou J J. Numerical simulation on the performance of SCR denitration reactors in thermal power plant[J]. Industrial Technology Innovation, 2016,12(1):13-18.
[25]
Kempton L, Pinson D, Chew S, et al. Simulation of macroscopic deformation using a sub-particle DEM approach[J]. Powder Technology, 2012,223(6):19-26.
[26]
吕太,赵学葵,王潜.燃煤机组SCR脱硝系统氨氮混合优化[J]. 热力发电, 2016,45(7):13-20,26. Lv T, Zhao X K, Wang Q. NH3-NOx mixture optimization for SCR denitrification system in a coa-fired unit[J]. Thermal Power Generation, 2016,45(7):13-20,26.
[27]
高畅,金保昇,张勇,等.非均匀入口条件下SCR脱硝系统精准喷氨策略[J]. 东南大学学报(自然科学版), 2017,47(2):271-276. Gao C, Jin B S, Zhang Y, et al. Precise ammonia injection strategy in SCR denitrification system based on non-uniform inlet parameters.
