330 MW燃煤发电机组SCR脱硝系统催化剂磨损原因分析
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摘要
某330 MW火电厂的SCR脱硝系统催化剂局部区域磨损严重。经实际调研,发现催化剂磨损较为严重区域位于距离前墙约1m左右处和紧靠后墙处。为探讨其原因,对烟道内烟气流动和飞灰颗粒的分布特征进行数值模拟研究,并以第一层催化剂前烟气速度大小、烟气中灰颗粒的浓度来定量表征含尘烟气对催化剂层磨损的作用情况,模拟结果与实际考察结果有较好的一致性。在进一步对原因分析的基础上提出了初步改进方案建议,为企业SCR脱硝系统的流场优化改造提供了技术支撑。
In the 330 MW thermal power plant,the SCR denitrification system have partially seriously worn problem.By investigating the catalyst wear condition,found that the catalyst located 1 mfrom the front wall and near the rear wall wore more seriously.To explore the causes,the flow characteristics of flue gas and fly ash particles are numerically simulated.The catalyst wear situation was quantitatively characterized by the flue gas velocity and the concentration of the ash particles above the first catalyst layer.The simulation results show good agreement with the actual results.Based on the simulation results,this paper puts forward some proposals for the preliminary improvement scheme,which provides technical support for the further optimization of the SCR system.
In the 330 MW thermal power plant,the SCR denitrification system have partially seriously worn problem.By investigating the catalyst wear condition,found that the catalyst located 1 mfrom the front wall and near the rear wall wore more seriously.To explore the causes,the flow characteristics of flue gas and fly ash particles are numerically simulated.The catalyst wear situation was quantitatively characterized by the flue gas velocity and the concentration of the ash particles above the first catalyst layer.The simulation results show good agreement with the actual results.Based on the simulation results,this paper puts forward some proposals for the preliminary improvement scheme,which provides technical support for the further optimization of the SCR system.
引文
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[6]王乐乐,孔凡海,何金亮,等.超低排放形势下SCR脱硝系统运行存在问题与对策[J].热力发电,2016,45(12):19-24.
[7]王放放,李敏,许佩瑶.某660 MW超超临界机组脱硝催化剂不均匀磨损治理[J].中国电力,2016,49(7):162-167.
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[14]朱天宇,李德波,方庆艳,等.燃煤锅炉SCR烟气脱硝系统流场优化的数值模拟[J].动力工程学报,2015,35(6):481-488.
[15]肖育军,陶莉,符思聪,等.脱硝系统烟气流场的性能与优化[J].环境工程学报,2016(8):4407-4413.
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[18]王福军.计算流体动力学分析-CFD软件原理与应用[M].北京:清华大学出版社,2004:7-11.
[19]邹欢.锅炉尾部烟道烟气三维流场的数值模拟及均流装置的研究[D].济南:山东大学,2013.
[20]邓静杰.燃煤电站SCR烟气脱硝催化剂的磨损研究[D].南京:东南大学,2015.
[21]秦福初.SCR脱硝催化剂抗磨损性能研究[C]//2015年中国环境科学学会学术年会论文集(第二卷).深圳:中国环境科学学会学术年会,2015.
[22]夏力伟,张学锁,韦红旗,等.SCR烟气脱硝系统上层催化剂磨损原因分析[J].热力发电,2015,44(2):110-114.
[23]李锋,於承志,张朋,等.高尘烟气脱硝催化剂耐磨性能研究[J].热力发电,2010,39(12):73-75.
[2]王文选,肖志均,夏怀祥.火电厂脱硝技术综述[J].电力设备,2006,7(8):1-5.
[3]高艳宏,刘清才,边凌涛.CFD在燃煤电厂SCR脱硝系统设计中的应用[J].热力发电,2011,40(4):85-85.
[4]谭青,冯雅晨.我国烟气脱硝行业现状与前景及SCR脱硝催化剂的研究进展[J].化工进展,2011,30(A1):709-713.
[5]胡永锋,白永锋.SCR法烟气脱硝技术在火电厂的应用[J].节能技术,2007,25(2):152-156.
[6]王乐乐,孔凡海,何金亮,等.超低排放形势下SCR脱硝系统运行存在问题与对策[J].热力发电,2016,45(12):19-24.
[7]王放放,李敏,许佩瑶.某660 MW超超临界机组脱硝催化剂不均匀磨损治理[J].中国电力,2016,49(7):162-167.
[8]蒋新伟.变截面烟道SCR烟气脱硝反应器整流装置的优化研究[D].杭州:浙江大学,2010.
[9]何文深,陈建军,郑佐东.SCR蜂窝式脱硝催化剂抗磨损性能研究[J].电力科技与环保,2011,27(5):10-12.
[10]XU Y Y,ZHANG Y,WANG J,et al.Application of CFD in the optimal design of a SCR-DeNOxsystem for a 300MW coal-fired power plant[J].Computers&Chemical Engineering,2013,49:50-60.
[11]XU Y,ZHANG Y,LIU F,et al.CFD analysis on the catalyst layer breakage failure of an SCR-DeNOxsystem for a350MW coal-fired power plant[J].Computers&Chemical Engineering,2014,69:119-127.
[12]OM J,WU W,JI P.3DNumerical Simulation of Gas Flow and Selective Catalytic Reduction(SCR)of NO in the Honeycomb Reactor[C]//2015 Asia-Pacific Energy Equipment Engineering Research Conference.Atlantis Press,2015.
[13]沈丹,仲兆平,过小玲.600MW电厂SCR烟气脱硝反应器内不同导流板的流场数值模拟[J].电力环境保护,2007,23(1):42-45.
[14]朱天宇,李德波,方庆艳,等.燃煤锅炉SCR烟气脱硝系统流场优化的数值模拟[J].动力工程学报,2015,35(6):481-488.
[15]肖育军,陶莉,符思聪,等.脱硝系统烟气流场的性能与优化[J].环境工程学报,2016(8):4407-4413.
[16]朱红钧,林元华,谢龙汉.FLUENT流体分析及仿真实用教程[M].北京:人民邮电出版社,2010:13-17.
[17]唐家鹏.FLUENT 14.0超级学习手册[M].北京:人民邮电出版社,2013:15-30.
[18]王福军.计算流体动力学分析-CFD软件原理与应用[M].北京:清华大学出版社,2004:7-11.
[19]邹欢.锅炉尾部烟道烟气三维流场的数值模拟及均流装置的研究[D].济南:山东大学,2013.
[20]邓静杰.燃煤电站SCR烟气脱硝催化剂的磨损研究[D].南京:东南大学,2015.
[21]秦福初.SCR脱硝催化剂抗磨损性能研究[C]//2015年中国环境科学学会学术年会论文集(第二卷).深圳:中国环境科学学会学术年会,2015.
[22]夏力伟,张学锁,韦红旗,等.SCR烟气脱硝系统上层催化剂磨损原因分析[J].热力发电,2015,44(2):110-114.
[23]李锋,於承志,张朋,等.高尘烟气脱硝催化剂耐磨性能研究[J].热力发电,2010,39(12):73-75.