CIESC Journal ›› 2013, Vol. ›› Issue (5): 1789-1796.doi: 10.3969/j.issn.0438-1157.2013.05.039

Previous Articles     Next Articles

Simulation and optimization of SNCR process

LI Qiong, WU Yuxin, YANG Hairui, LÜ Junfu   

  1. Key laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
  • Received:2012-08-04 Revised:2012-11-24 Online:2013-05-05
  • Supported by:

    supported by the Key Project in the National Science & Technology Pillar Program(2012BAA02B01)and the National Natural Science Foundation of China(51076081).

PDF (PC)

469

Abstract: Using computational fluid dynamics(CFD)method,the urea-based selective non-catalytic reduction(SNCR)process in a 100 t·h-1 circulating fluidized bed(CFB)boiler was numerically simulated to study effect of temperature and normalized stoichiometric ratio(NSR)on SNCR denitration efficiency, NH3 slip and N2O formation.The results show that the window of optimized temperature for SNCR process is in a range of 850-1050℃ and becomes wider with increasing NSR; when temperature rises, NH3 slip decreases obviously and can be ignored if temperature is higher than 940℃.With increase of temperature, amount of N2O formation increases first and then decreases.With increasing NSR, the denitration efficiency and NH3 slip increase.The denitration efficiency is the maximum at 980℃.Formation of N2O is in proportion to denitration efficiency and the maximum about 30 μl·L-1.

Key words: SNCR, temperature window, NSR, NH3 slip, CFD

CLC Number: 

  • X5
[1] Richard K Lyon.Method for the reduction of the concentration of NO in combustion effluents using ammonia:US, 3900554.1975
[2] Hou Xiangsong(侯祥松).Experimental study on NO and N2O removal in CFB boiler.Beijing:Tsinghua University, 2007
[3] Oliva M, Alzueta M U, Millera A, Bilbao R.Theoretical study of the influence of mixing in the SNCR process. Comparison with pilot scale data[J].Chemical Engineering Science, 2000, 55(22):5321-5332
[4] Lee Gang-Woo, Shon Byung-Hyun, Jung Jong-Hyeon, Choi Won-Joon, Oh Kwang-Joon.Effect of mixing on NO removal in the selective noncatalytic reduction reaction process[J].Journal of Material Cycles and Waste Management, 2010, 12(3):204-211
[5] Brouwer J, Heap M P.A model for prediction of selective noncatalytic reduction of nitrogen oxides by ammonia, urea, and cyanuric acid with mixing limitations in the presence of CO[J].Symposium(International)on Combustion, 1996, 26(2):2117-2124
[6] Thanh D B Nguyen, Young-II Lim, Seong-Joon Kim, Won-Hyeon Eom, Kyung-Seun Yoon.Experiment and computational fluid dynamics(CFD)simulation of urea-based selective noncatalytic reduction(SNCR)in a pilot-scale flow reactor[J].Energy & Fuels, 2008, 22(6):3864-3876
[7] Newhall Pont J, Evans A B, England G C, Lyon R K, Seeker W R.Evaluation of the CombiNOx process at pilot scale[J].Environmental Progress, 1993, 12(2):140-145
[8] Morten Jødal, Tove Linding Lauridsen, Kim Dam-Johansen. NOx removal on a coal-fired utility boiler by SNCR[J].Environmental Progress, 1992, 11(4):296-301
[9] Liu Limei(刘丽梅), Han Binqiao(韩斌桥), Han Zhenghua(韩正华).Common problems appeared in SNCR denitrification system of coal-fired boilers and countermeasures thereof[J].Thermal Power Generation(热力发电), 2010, 39(6):65-70
[10] Liang Xiujin(梁秀进), Zhong Zhaoping(仲兆平), Jin Baosheng(金保升), Wang Shuangqun(王双群).Experimental study and simulation of SNCR denitrification process with gas-state ammonia serving as a reducing agent[J].Journal of Engineering for Thermal Energy and Power(热能动力工程), 2009, 24(6):798-802
[11] Marek A Wójtowicz, Jan R Pels, Jacob A Moulijn.N2O emission control in coal combustion[J].Fuel, 1994, 73(9):1416-1422
[12] Valentim B, Lemos de Sousa M J, Abelha P, Boavida D,Gulyurtlu I.Combustion studies in a fluidised bed-The link between temperature, NOx and N2O formation, char morphology and coal type[J].International Journal of Coal Geology, 2006, 67(3):191-201
[13] Liang Xiujin(梁秀进), Zhong Zhaoping(仲兆平).Simulation of selective non-catalytic reduction process by the model of laminar finite rate with FLUENT[J].Proceedings of the CSEE(中国电机工程学报), 2009, 29(35):96-101
[14] Jan E Johnsson, Lars-Erik Amand, Kim Dam-Johansen, Bo Lechner.Modeling N2O reduction and decomposition in a circulating fluidized bed boiler[J].Energy & Fuels, 1996, 10(4):970-979
[15] Chung J N, Troutt T R.Simulation of particle dispersion in an axisymmetric jet[J].Journal of Fluid Mechanics, 1988,186:199-222
[16] Kim Hey-Suk, Shin Mi-Soo, Jang Dong-Soon, Ohm Tae-In.Numerical study of SNCR application to a full-scale stoker incinerator at Daejon 4th industrial complex[J].Applied Thermal Engineering, 2004, 24(14-15):2117-2129
[17] Li Fangfang(李芳芳).Numerical simulation of SNCR process of a 600MW utility boiler.Harbin:Harbin Institute of Technology, 2008
[18] Wei Zhou, David Moyeda, Vitali Lissianskin, Chen J Y. Development and implementation of numerical simulation for a selective noncatalytic reduction system design[J].Ind. Eng. Chem. Res., 2009, 48(24):10994-11001
[19] Jung Bin Lee, Sang Done Kim.Kinetics of NOx reduction by urea solution in a pilot scale reactor[J].Journal of Chemical Engineering of Japan, 1996,29(4):620-626
[20] Vladimir M Zamansky, Vitali V Lissianski, Peter M Maly, Loc Ho, Darwin Rusli, William C Gardiner Jr.Reactions of sodium species in the promoted SNCR process[J].Combustion and Flame, 1999, 117(4):821-831
[21] Gao Liang(高亮), Wang Zhihua(王智化), Ling Zhongqian(凌忠钱), Zhou Zhanghua(周樟华), Li Guoneng(李国能), Zhou Hao(周昊), Cen Kefa(岑可法).Mechanism and parameters study on NOx abatement use urea as agent in boiler[J].Boiler Technology(锅炉技术), 2008, 25(1):109-117
[22] Tayyeb Javed M, Naseem Irfan, Gibbs B M.Control of combustion-generated nitrogen oxides by selective non-catalytic reduction[J].Journal of Environmental Management, 2007, 83(3):251-289
[23] Lu Zhimin(卢志民), Zhou Junhu(周俊虎), Ce Kefa(岑可法), Lu Jidong(陆继东).Flow reactor experiments and kinetics modeling on selective non-catalytic removal of NOx under different O2 atmospheres[J].Proceedings of the CSEE(中国电机工程学报), 2008, 28(29):78-82
[24] Lü Hongkun(吕洪坤), Yang Weijuan(杨卫娟), Zhou Junhu(周俊虎), Zhou Zhijun(周志军), Huang Zhenyu(黄镇宇), Cen Kefa(岑可法).Experimental research on SNCR applied in power plant boiler:impact of temperature and urea solution injection volume flow rate[J].Journal of Zhejiang University(浙江大学学报), 2009, 43(9):1655-1660
[25] Liu Hui(刘辉), Zhu Shuyang(朱舒扬), Cao Qingxi(曹庆喜), Wu Shaohua(吴少华), Sun Dezhi(孙德智).Influence of mixing process on the selective non-catalytic reduction[J].Proceedings of the CSEE(中国电机工程学报),2009, 29(26):43-47
[26] Lü Hongkun(吕洪坤), Yang Weijuan(杨卫娟), Zhou Junhu(周俊虎), Zhou Zhijun(周志军), Liu Jianzhong(刘建忠), Cen Kefa(岑可法).Effects of CO content on selective non-catalytic reduction of NOx[J].CIESC Journal(化工学报), 2009, 60(7):1773-1780
[27] Zhu Shuyang(朱舒扬).Foundation research on selective non-catalytic reduction process.Harbin:Harbin Institute of Technology, 2010
[28] Lü Hongkun(吕洪坤), Yang Weijuan(杨卫娟), Zhou Junhu(周俊虎), Cen Kefa(岑可法), Zhang Ming(张明), Li Fengrui(李凤瑞).Experimental study and mechanism analysis on selective non-catalytic reduction reactions[J].Power System Engineering(电站系统工程), 2011, 27(2):4-7
[29] Verloop C M, Andries J, Hein K R G.Nitrogenous emissions from the delft pressurized fluidized bed combustor[J].Fuel Processing Technology, 1993, 36(1/2/3):109-115
[30] Lu Zhimin(卢志民).Study on reaction mechanism and mixing characteristics of SNCR technique[D].Hangzhou:Zhejiang University, 2006
[31] Zhu Baidong(祝百东).Experimental study on SNCR flue gas denitrification technology[D].Harbin:Harbin Institute of Technology, 2006
[32] Li Kefu(李可夫), Wu Shaohua(吴少华), Li Zhenzhong(李振中), Wang Yang(王阳), Dong Jianxun(董建勋), Qin Yukun(秦裕琨).Pilot-scale experimental study of NOxOUT process[J].Proceedings of the CSEE(中国电机工程学报), 2006, 26(25):97-101
[33] Li Kefu(李可夫), Tao Ling(陶玲), Wu Shaohua(吴少华), Li Zhenzhong(李振中), Wang Yang(王阳), Qin Yukun(秦裕琨).Experimental study on effect factors of NH3 slip in SNCR process[J].Proceedings of the CSEE(中国电机工程学报), 2008, 28(5):51-56
[34] Lü Hongkun(吕洪坤).Experimental and mechanism study on selective non-catalytic reduction and advanced reburning[D].Hangzhou:Zhejiang University, 2009
[1] XIONG Pan, YAN Shuguang, LIU Weiyin. Structure optimization of cyclone based on response surface method [J]. CIESC Journal, 2019, 70(1): 154-160.
[2] CHEN Guoqi, SUN Jianjun, SUN Dianfeng, MA Chenbo. Performance analysis of double-end self-pumping mechanical seal for main coolant pump of sodium-cooled fast reactor [J]. CIESC Journal, 2018, 69(8): 3565-3576.
[3] HU Rentao, REN Libo, WANG Dewu, LIU Yan, ZHANG Shaofeng. Numerical simulation of fully developed liquid-solid flow in vertical narrow channel [J]. CIESC Journal, 2018, 69(8): 3408-3417.
[4] GU Xin, LUO Yuankun, XIONG Xiaochao, WANG Ke, TAO Zhilin. Influence of twisty flow heat exchanger's structural parameters on flow field and temperature field [J]. CIESC Journal, 2018, 69(8): 3390-3397.
[5] PU Ge, DU Jiantai, ZHANG Zhang, ZHANG Dinghai, WU Bang, HUANG Beibei, ZHU Tuanhui. Experimental study of selective non-catalytic reduction process with methylamine as reducing agent [J]. CIESC Journal, 2018, 69(7): 3234-3241.
[6] ZHEN Wenyuan, LI Qing. Preparation of TiO2/attapulgite composite photocatalyst by supercritical fluid drying method [J]. CIESC Journal, 2018, 69(5): 2290-2298.
[7] QI Hang, ZHANG Wei, GONG Liang. Liquid film flow and heat transfer model under spray impact [J]. CIESC Journal, 2018, 69(5): 2014-2022.
[8] WANG Yang, ZHUANG Liwei, MA Xiaohua, XU Zhenliang, WANG Zhi. CFD simulation of Dean vortex enhanced mass transfer in hollow fiber membrane pervaporation [J]. CIESC Journal, 2018, 69(11): 4655-4662.
[9] ZHANG Jiabao, CUI Lijie, YANG Ning. Effects of drag model and turbulence model on simulation of air-lift internal-loop reactor [J]. CIESC Journal, 2018, 69(1): 389-395.
[10] CHEN Hongxia, HUANG Linbin, GONG Yifei. Pressure evolution and interface movement of slug flow during micro-channel modulation process [J]. CIESC Journal, 2017, 68(8): 3030-3038.
[11] WANG Jue, YANG Ning. CFD-PBM simulation with EMMS correctors for bubble column reactors [J]. CIESC Journal, 2017, 68(7): 2667-2677.
[12] YANG Fengling, ZHOU Shenjie. Progress of solid-liquid suspension in stirred vessel [J]. CIESC Journal, 2017, 68(6): 2233-2248.
[13] SUN Tong, LU Ping, CAI Jie, WU Jiang. Effects of Na/K additives on NO reduction and its promotion mechanism in SNCR process [J]. CIESC Journal, 2017, 68(3): 1178-1184.
[14] RAN Tangchun, YANG Tao, CHEN Pan, LI Jiao, YIN Yongxiang. Simulation for a novel method to quench super-high temperature fluid [J]. CIESC Journal, 2017, 68(11): 4079-4087.
[15] ZHOU Fei, ZHANG Hui, XIAO Jie. Simulation and analysis of surface morphology evolution during coating formation [J]. CIESC Journal, 2017, 68(11): 4208-4220.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
Copyright © 2019 CIESC Journal, All Rights Reserved.
Powered by Beijing Magtech Co. Ltd