SCR烟气脱硝工艺喷氨混合装置研究进展

doi:10.16085/j.issn.1000-6613.2015.12.004

摘要/Abstract

摘要： 氨法选择性催化还原技术(SCR)因其优良的综合性能而成为工程应用最为广泛的烟气脱硝工艺,而反应器横截面上混合气体流场均匀性优劣是高效烟气脱硝的重要影响因素。本文简述了SCR烟气脱硝系统基本原理和NH₃/NO_x混合效率指标;综述了线性控制式、分区控制式和混合型喷氨格栅等几种工程应用上主流技术及其最新研究成果,并分析了各气体流场均匀性调节技术的优缺点;最后指出氨喷射混合装置未来的发展趋势:①优先选用混合型喷氨格栅,分区控制式喷氨格栅和线性控制式喷氨格栅分别次之;②喷氨混合装置设计时重点寻求降低浓度不均匀系数的可行性;③研发简易、高能和稳定的静态混合结构,降低建设和运行成本,提高操作弹性;④完善还原剂氨喷射效应和喷氨量现代控制理论。

关键词: 氮氧化物, 烟气脱硝, 选择性催化还原, 喷射混合, 均匀分布

Abstract: Selective catalytic reduction (SCR) by ammonia process has been the most extensive engineering application of denitrification technology due to its excellent comprehensive performance. The uniformity of the mixed gas flow field ratio on the lateral section of the SCR reactor is a key factor affecting denitrification efficiency. This review represents the basic principle of SCR as well as the mixing efficiency index of NH₃/NO_x. The methods and recent work on mainstream technology of the engineering application were reviewed,such as linear controlled injection grid,divisional controlled injection grid,and mixed element type of injection grid. The advantages and disadvantages of different methods were analyzed. Further studies on the ammonia injection and mixing involve:①The mixed element type of injection grid is preferred,the divisional controlled and linear controlled type of injection grid take second place. ②Focus on the feasibility of the lower concentration of non-uniform coefficient in the design of the mixing device. ③Development of high efficiency,simple and stable hybrid element structure,reducing construction and operating costs,improving operational flexibility. ④Perfection of the ammonia injection effect and modern control theory of amount.

Key words: nitrogen oxides, flue gas denitrification(DeNO_x), selective catalytic reduction (SCR), injection and mixing, uniform distribution

中图分类号:

TQ534.9

韩发年, 闫志勇. SCR烟气脱硝工艺喷氨混合装置研究进展[J]. 化工进展, 2015, 34(12): 4151-4157.

HAN Fanian, YAN Zhiyong. Advances in ammonia injection and mixing device of SCR-DeNO_x system[J]. Chemical Industry and Engineering Progree, 2015, 34(12): 4151-4157.

参考文献

[1] Skalska Kinga,Miller Jacek S,Ledakowicz Stanislaw. Trends in NO_x abatement:A review[J]. Science of The Total Environment,2010,408(19):3976-3989.
[2] Mustafic H,Jabre P,Caussin C,et al. Main air pollutants and myocardial infarction:A systematic review and meta-analysis[J]. Jama the Journal of the American Medical Association,2012,307(7):713-721.
[3] 陈斌. 中国环境统计年报(2013年度)[M]. 北京:中国环境科学出版社,2014.
[4] 姚立英,张东国,王伟,等. 燃煤工业锅炉氮氧化物污染防治技术路线[J]. 北方环境,2012,24(2):79-82.
[5] Liu Zhiming,Li Junhua,Woo Seong Ihl. Recent advances in the selective catalytic reduction of NO_x by hydrogen in the presence of oxygen[J]. Energy & Environmental Science,2012,5(10):8799-8814.
[6] Coghe Aido,Solero Giulio,Scribano Gianfranco. Recirculation phenomena in a natural gas swirl combustor[J]. Experimental Thermal and Fluid Science,2004,28(7):709-714.
[7] Cheng Xingxing,Bi Xiaotao. A review of recent advances in selective catalytic NO_x reduction reactor technologies[J]. Particuology,2014,16:1-18.
[8] Ruggeri Maria Pia,Grossale Antonio,Nova Isabella,et al. FTIR in situ mechanistic study of the NH₃-NO/NO₂ “Fast SCR” reaction over a commercial Fe-ZSM-5 catalyst[J]. Catalysis Today,2012,184(1):107-114.
[9] Sultana Asima,Sasaki Motoi,Suzuki Kunio,et al. Tuning the NO_x conversion of Cu-Fe/ZSM-5 catalyst in NH₃-SCR[J]. Catalysis Communications,2013,41:21-25.
[10] Cho Jin Man,Choi Jeong-Woo,Hong Sung Ho,et al. The methodology to improve the performance of a selective catalytic reduction system installed in HRSG using computational fluid dynamics analysis[J]. Environmental Engineering Science,2006,23(5):863-873.
[11] Schreifels Jeremy J,Wang Shuxiao,Hao Jiming. Design and operational considerations for selective catalytic reduction technologies at coal-fired boilers[J]. Frontiers in Energy,2012,6(1):98-105.
[12] Chen Juhn-Jie,Lan Chao-Ho,Jeng Ming-Shan,et al. The development of fan filter unit with flow rate feedback control in a cleanroom[J]. Building and Environment,2007,10(42):3556-3561.
[13] Nalbandian H. NO_x Control for Coal-fired Plant,CCC/157[R]. London:IEA Clean Coal Centre,2009.
[14] Faghihi Ehsan Majd,Shamekhi Amir H. Development of a neural network model for selective catalytic reduction(SCR) catalytic converter and ammonia dosing optimization using multi objective genetic algorithm[J]. Chemical Engineering Journal,2010,165:508-516.
[15] 毛剑宏. 大型电站锅炉SCR烟气脱硝系统关键技术研究[D]. 杭州:浙江大学,2011.
[16] Muncy J,Shore D,Martz T,et al. Interlayer mixing for improved SCR performance[C]//Pittsburgh:2006 Environmental Controls Conference,2006.
[17] Xu Yuanyuan,Zhang Yan,Liu Fengna,et al. CFD analysis on the catalyst layer breakage failure of an SCR-DeNO_x system for a 350MW coal-fired power plant[J]. Computers and Chemical Engineering,2014,69:119-127.
[18] 林钢,金强,袁景淇,等. 基于CFD的SCR脱硝装置整流格栅优化设计[J]. 控制工程,2011,18:97-99.
[19] Institute of Clean Air Companies (ICAC). Selective Catalytic Reduction (SCR) for Controlling NO_x Emissions from Fossil Fuel Fired Electric Power Plants[R]. Washington: U. S. ICAC,2009.
[20] 张云. 燃煤机组SCR脱硝系统AIG喷氨优化调整[J]. 中国高新技术企业,2014(21):49-50.
[21] Lei Zhigang,Wen Cuiping,Chen Biaohua. Optimization of internals for selective catalytic reduction(SCR)for NO removal[J]. Environmental Science & Technology,2011,45(8):3437-3444. [22] Tonn D P,Uysal T A. 2200MW SCR Installation on New Coal-Fired Project[R]. Durham:Babcock & Wilcox,1998.
[23] 林宗虎,徐通模. 实用锅炉手册[M]. 北京:化学工业出版社,2009:994-997.
[24] Opitz B, Bendrich M,Drochner A,et al. Simulation study of SCR catalysts with individually adjusted ammonia dosing strategies[J]. Chemical Engineering Journal,2015,264:936-944.
[25] 吕同波,李林,王淑荣,等. 选择性催化还原法脱硝装置流动及阻力特性的研究[J]. 华电技术,2009,31(12):8-14.
[26] Rogers K,Thompson C. Development and performance data for ammonia injection and gas mixing process on SCR applications[J]. Combined Power Air Pollutant Control Mega Symposium,2004,2:645-667.
[27] Rogers Kevin,Albrecht Mel,Varner Michael. Numerical Modeling for Design Optimization of SCR Applications[R]. Washington:Babcock & Wilcox,2000.
[28] Buzanowski Mark A. Optimized ammonia injection for power plant SCR systems[C]//San Antonio:Proceedings of ASME Power Conference,2007.
[29] Buzanowski Mark A,Burlage Peter J,Fadda Dani Z. Reagent injection grid:US,7383850[P]. 2008-06-10.
[30] Choi Hang Seok,Kim Seoek Joon,Kim Kwan Tae. Enhancement of turbulent scalar mixing and its application by a multihole nozzle in selective catalytic reduction of NO_x[J]. Journal of Material Cycles and Waste Management,2008,10(1):1-6.
[31] Eiteneer Boris Nickolaevich. Apparatus for a nitrogen purge system:US,8728412[P]. 2014-05-20.
[32] 金保昇,张勇,潘志越. 一种风帽式选择性催化还原脱硝喷氨混合装置:中国,201220041023. 3[P]. 2012-12-19.
[33] Nischt W,Bigalbal J,Wooldridge B. Recent SCR retrofit experience on coal-fired boilers[R]. New Orleans:U. S. Babcock & Wilcox,2009.
[34] 汤元强. 燃煤电厂SCR烟气脱硝系统优化与飞灰颗粒运动的研究[D]. 上海:上海交通大学,2012.
[35] Nguyen Khanh,Fadda Dani,Buzanowski Mark A. Flow modeling for a sample cycle turbine equipped with selective catalytic reduction system for NO_x control[R]. Houston:ASME Fluids Engineering Division Summer Meeting and Exhibition,2005.
[36] 夏怀祥,段传和. 选择性催化还原法(SCR)烟气脱硝[M]. 北京:中国电力出版社,2012:229-231.
[37] Peng Hui,Ozaki T,Toyoda Y,et al. RBF-ARX model-based nonlinear system modeling and predictive control with application to a NO_x decomposition process[J]. Control Engineering Practice,2004,12(2):191-203.
[38] Bortman M,Aladjem M. A growing and pruning method for radial basis function networks[J]. Transaction on Neural Network,2009,20(6): 1039-1045.
[39] Zhou Hongyu,Zhao Qian,Zhang Zhenhua,et al. Multi-ANN predictive control of citrus peel supercritical extraction temperature[J]. Advanced Materials Research,2011,236-238:1472-1479.
[40] Munter R. Comparison of mass transfer efficiency and energy consumption in static mixers[J]. Science and Engineering,2010,32(6):399-407.
[41] Rogers K J. SCR inlet maldistributions-Their effects & strategies for their control[C]//Pittsburgh:DOE 2002 Conference on SCR & SNCR reduction for NO_x control,2002.
[42] Rogers K J. Mixing performance characterization for optimization and development on SCR application[C]//Pittsburgh:DOE 2003 Conference on SCR/SNCR for NO_x control,Pittsburgh,2003. [43] Xu Yuanyuan,Zhang Yan,Wang Jingcheng,et al. Application of CFD in the optimal design of a SCR-DeNO_x system for a 300MW coal-fired power plant[J]. Computers and Chemical Engineering,2013,49:50-60.
[44] Canpolat C,Yayla S,Sahin B,et al. Observation of the vortical flow over a yawed delta wing[J]. Journal of Aerospace Engineering,2012,25(4): 613-626.
[45] Fink J,Andoh R. CFD as applied to the development of a hydrodynamic vortex mixer[C]//California:World Environmental and Water Resources Congress,2011.
[46] Gao Yanhong,Liu Qingcai,Bian Lingtao. Numerical simulation and optimization of flow field in the SCR denitrification system on a 600MW capacity units[J]. Energy Procedia,2012,14:370-375.
[47] Rogers K J. Development and performance data for ammonia injection and gas mixing process on SCR applications[C]//Washington:EPRI Power Plant Air Pollutant Control Mega Symposium,2004.
[48] Streiff Felix,Fleischli Markus. Static mixing element having deflectors and a mixing device:US,Re. 36969[P]. 2000-11-28.
[49] Wirt Jeffrey Philip,Martin Richard. Ammonia injection grid for a selective catalytic reduction system:US,8017084[P]. 2011-09-13.
[50] 曾庆,吴其荣,魏丽斯,等. 烟气混合元件及使用该烟气混合元件的烟气脱硝系统:中国,201120039806.3[P]. 2011-09-14.
[51] 孙克勤,钟秦,华玉龙,等. SCR反应器短直进口段混氨技术研究[J]. 中国环保产业,2007(3):10-13.
[52] 洪燕,杜云贵,蒋建华,等. 用于SCR脱硝系统的动态混合装置:中国,200920128994. X[P]. 2010-08-11.
[53] 牛国平,董栋,王晓冰,等. 一种局部涡流和整体旋流相结合的花瓣型喷氨格栅:中国,201210394099. 9[P]. 2013-04-03.