降低燃煤机组SCR脱硝系统催化剂磨损的流场优化
|
摘要
针对国内某300 MW燃煤机组SCR脱硝系统催化剂严重磨损失效问题,提出了利用圆盘静态混合器代替常规导流板的改造方案。采用工业性试验测试气固两相流场分布情况并依此确定边界条件,利用计算流体力学方法对SCR脱硝系统中烟气速度、烟尘速度、烟尘质量浓度分布等规律进行研究,最终将优化方案应用到脱硝改造工程中。研究结果表明:催化剂的磨损主要是由烟道中烟尘掺混不均及最接近催化剂的导流板安装不合理所致。竖直烟道中安装圆盘静态混合器可使气固两相均匀分布,在较低的压阻下解决SCR脱硝系统催化剂入口截面气固两相混合不均的问题,有效延长催化剂的使用寿命。
To resolve the problem of serious attrition occurred in the catalyst layer of a domestic 300 MW unit, a static disc mixer is adopted to replace the conventional diversion plate. The distribution of the gas-solid two-phase flow field is measured by the industrial test and the boundary conditions are determined accordingly. The velocity of flue gas and soot, and the distribution of mass concentration of soot in the SCR denitrification system are studied using the computational fluid dynamics method. The optimized scheme is eventually applied to the SCR denitrification retrofit project. The results show that the wear of the catalyst is mainly caused by the uneven mixing of smoke and dust in the flue,and the improper installation of the diversion plate closest to the catalyst.The problem of uneven gas-solid two-phase mixing in the inlet section of the catalyst for SCR denitrification system is resolved under lower pressure resistance,which effectively prolongs the service life of the catalyst.
To resolve the problem of serious attrition occurred in the catalyst layer of a domestic 300 MW unit, a static disc mixer is adopted to replace the conventional diversion plate. The distribution of the gas-solid two-phase flow field is measured by the industrial test and the boundary conditions are determined accordingly. The velocity of flue gas and soot, and the distribution of mass concentration of soot in the SCR denitrification system are studied using the computational fluid dynamics method. The optimized scheme is eventually applied to the SCR denitrification retrofit project. The results show that the wear of the catalyst is mainly caused by the uneven mixing of smoke and dust in the flue,and the improper installation of the diversion plate closest to the catalyst.The problem of uneven gas-solid two-phase mixing in the inlet section of the catalyst for SCR denitrification system is resolved under lower pressure resistance,which effectively prolongs the service life of the catalyst.
引文
[1]金理鹏,谢新华,黄飞,等.SCR脱硝装置大颗粒灰拦截技术试验研究[J].中国电力,2018,51(2):156-161.JIN Lipeng,XIE Xinhua,HUANG Fei,et al.Experimental study on the technology of large particle ash interception for SCR De-NOx equipment[J].Electric Power,2018,51(2):156-161.
[2]段传和,夏怀祥,葛亮.燃煤电站SCR烟气脱硝工程技术[M].北京:中国电力出版社,2009.
[3]RISIO B,HAN X,HILBER M,et al.Industrial scale assessment of the predictive quality of a 3D-CFD model for SCR de-NOx catalysts[J].VGB Powertech,2012,92(10):74-79.
[4]肖雨亭,徐莉,贾曼,等.蜂窝式脱硝催化剂在烟气中磨损行为的模拟研究[J].中国电力,2012,45(12):96-98,102.XIAO Yuting,XU Li,JIA Man,et al.Research on abrasion simulation of de-NOx honeycomb catalysts in flue gas[J].Electric Power,2012,45(12):96-98,102.
[5]姜烨,高翔,吴卫红,等.选择性催化还原脱硝催化剂失活研究综述[J].中国电机工程学报,2013,33(14):18-31.JIANG Ye,GAO Xiang,WU Weihong,et al.Review of the deactivation of selective catalytic reduction De-NOx catalysts[J].Proceedings of the CSEE,2013,33(14):18-31.
[6]DRITSELIS C D,VLACHOS N S.Large eddy simulation of gasparticle turbulent channel flow with momentum exchange between the phases[J].International Journal of Multiphase Flow,2011,37(7):706-721.
[7]安敬学,王磊,秦淇,等.SCR脱硝系统催化剂磨损机理分析与治理[J].热力发电,2015,44(12):119-125.AN Jingxue,WANG Lei,QIN Qi,et al.Mechanism research on catalyst attrition in SCR denitration system and the treatment[J].Thermal Power Generation,2015,44(12):119-125.
[8]安敬学,王磊,秦淇,等.电站锅炉脱硝系统催化剂磨损数值模拟[J].锅炉技术,2016,47(2):32-38,42.AN Jingxue,WANG Lei,QIN Qi,et al.Study and governance of SCR catalyst attrition based on the numerical simulation and testing[J].Boiler Technology,2016,47(2):32-38,42.
[9]潘晓慧,马春元,崔琳.两相均流板对弯管中气固两相运动分布特征的影响[J].化工学报,2016,67(6):2308-2317.PAN Xiaohui,MA Chunyuan,CUI Lin.Motion and distribution of gas-solid two-phase flow in elbow with two-phase deflector[J].CIESC Journal,2016,67(6):2308-2317.
[10]潘晓慧.静电除尘器内微细颗粒的多场协同作用研究[D].济南:山东大学,2017.
[11]XU Yuanyuan,ZHANG Yan,LIU Fengna,et al.CFD analysis on the catalyst layer breakage failure of an SCR-De NOx system for a350 MW coal-fired powerplant[J].Computers&Chemical Engineering,2014,69:119-127.
[12]XU Yuanyuan,ZHANG Yan,WANG Jingcheng,et al.Application of CFD in the optimal design of a SCR de-NOx system for a 300 MW coal-fired power plant[J].Computers&Chemical Engineering,2013,49(2):50-60.
[13]国家能源局.燃煤电厂SCR烟气脱硝流场模拟技术规范:DL/T1418-2015[S].2016.
[14]庄柯,姚杰,吴碧君,等.脱硝反应器内烟气与飞灰分布差异的数值模拟[J].中国电力,2018,51(2):137-142.ZHUANG Ke,YAO Jie,WU Bijun,et al.Numerical simulation of the distribution discrepancies between flue gas flow field and fly ash concentration field in SCR De-NOx reactor[J].Electric Power,2018,51(2):137-142.
[15]周英贵,金保昇.基于非均匀入口条件SCR系统气固相组分的分布特性优化[J].环境工程学报,2017,11(1):421-426.ZHOU Yinggui,JIN Baosheng.Distribution characteristics optimization of gas-solid fluid for SCR system based on non-uniform inlet condition[J].Chinese Journal of Environmental Engineering,2017,11(1):421-426.
[16]周英贵,金保昇.基于非均匀入口条件的SCR氨喷射方法[J].华中科技大学学报(自然科学版),2016,44(4):121-126.ZHOU Yinggui,JIN Baosheng.Ammonia injection method for SCRbased on non-uniform inlet condition[J].Journal of Huazhong University of Science and Technology(natural science),2016,44(4):121-126.
[17]AKILLI H,LEVY E K,SAHIN B.Gas-solid flow behavior in a horizontal pipe after a 90°vertical-to-horizontal elbow[J].Powder Technology,2001,116(1):43-52.
[18]洪文鹏,雷鉴琦.应用响应曲面法的波纹板除雾器钩片尺寸优化[J].中国电力,2016,49(11):170-174.HONG Wenpeng,LEI Jianqi.Optimization of corrugated plate mist eliminator hook dimensions with response surface method[J].Electric Power,2016,49(11):170-174.
[19]袁竹林,朱立平,耿凡等.气固两相流动与数值模拟[M].南京:东南大学出版社,2013.
[2]段传和,夏怀祥,葛亮.燃煤电站SCR烟气脱硝工程技术[M].北京:中国电力出版社,2009.
[3]RISIO B,HAN X,HILBER M,et al.Industrial scale assessment of the predictive quality of a 3D-CFD model for SCR de-NOx catalysts[J].VGB Powertech,2012,92(10):74-79.
[4]肖雨亭,徐莉,贾曼,等.蜂窝式脱硝催化剂在烟气中磨损行为的模拟研究[J].中国电力,2012,45(12):96-98,102.XIAO Yuting,XU Li,JIA Man,et al.Research on abrasion simulation of de-NOx honeycomb catalysts in flue gas[J].Electric Power,2012,45(12):96-98,102.
[5]姜烨,高翔,吴卫红,等.选择性催化还原脱硝催化剂失活研究综述[J].中国电机工程学报,2013,33(14):18-31.JIANG Ye,GAO Xiang,WU Weihong,et al.Review of the deactivation of selective catalytic reduction De-NOx catalysts[J].Proceedings of the CSEE,2013,33(14):18-31.
[6]DRITSELIS C D,VLACHOS N S.Large eddy simulation of gasparticle turbulent channel flow with momentum exchange between the phases[J].International Journal of Multiphase Flow,2011,37(7):706-721.
[7]安敬学,王磊,秦淇,等.SCR脱硝系统催化剂磨损机理分析与治理[J].热力发电,2015,44(12):119-125.AN Jingxue,WANG Lei,QIN Qi,et al.Mechanism research on catalyst attrition in SCR denitration system and the treatment[J].Thermal Power Generation,2015,44(12):119-125.
[8]安敬学,王磊,秦淇,等.电站锅炉脱硝系统催化剂磨损数值模拟[J].锅炉技术,2016,47(2):32-38,42.AN Jingxue,WANG Lei,QIN Qi,et al.Study and governance of SCR catalyst attrition based on the numerical simulation and testing[J].Boiler Technology,2016,47(2):32-38,42.
[9]潘晓慧,马春元,崔琳.两相均流板对弯管中气固两相运动分布特征的影响[J].化工学报,2016,67(6):2308-2317.PAN Xiaohui,MA Chunyuan,CUI Lin.Motion and distribution of gas-solid two-phase flow in elbow with two-phase deflector[J].CIESC Journal,2016,67(6):2308-2317.
[10]潘晓慧.静电除尘器内微细颗粒的多场协同作用研究[D].济南:山东大学,2017.
[11]XU Yuanyuan,ZHANG Yan,LIU Fengna,et al.CFD analysis on the catalyst layer breakage failure of an SCR-De NOx system for a350 MW coal-fired powerplant[J].Computers&Chemical Engineering,2014,69:119-127.
[12]XU Yuanyuan,ZHANG Yan,WANG Jingcheng,et al.Application of CFD in the optimal design of a SCR de-NOx system for a 300 MW coal-fired power plant[J].Computers&Chemical Engineering,2013,49(2):50-60.
[13]国家能源局.燃煤电厂SCR烟气脱硝流场模拟技术规范:DL/T1418-2015[S].2016.
[14]庄柯,姚杰,吴碧君,等.脱硝反应器内烟气与飞灰分布差异的数值模拟[J].中国电力,2018,51(2):137-142.ZHUANG Ke,YAO Jie,WU Bijun,et al.Numerical simulation of the distribution discrepancies between flue gas flow field and fly ash concentration field in SCR De-NOx reactor[J].Electric Power,2018,51(2):137-142.
[15]周英贵,金保昇.基于非均匀入口条件SCR系统气固相组分的分布特性优化[J].环境工程学报,2017,11(1):421-426.ZHOU Yinggui,JIN Baosheng.Distribution characteristics optimization of gas-solid fluid for SCR system based on non-uniform inlet condition[J].Chinese Journal of Environmental Engineering,2017,11(1):421-426.
[16]周英贵,金保昇.基于非均匀入口条件的SCR氨喷射方法[J].华中科技大学学报(自然科学版),2016,44(4):121-126.ZHOU Yinggui,JIN Baosheng.Ammonia injection method for SCRbased on non-uniform inlet condition[J].Journal of Huazhong University of Science and Technology(natural science),2016,44(4):121-126.
[17]AKILLI H,LEVY E K,SAHIN B.Gas-solid flow behavior in a horizontal pipe after a 90°vertical-to-horizontal elbow[J].Powder Technology,2001,116(1):43-52.
[18]洪文鹏,雷鉴琦.应用响应曲面法的波纹板除雾器钩片尺寸优化[J].中国电力,2016,49(11):170-174.HONG Wenpeng,LEI Jianqi.Optimization of corrugated plate mist eliminator hook dimensions with response surface method[J].Electric Power,2016,49(11):170-174.
[19]袁竹林,朱立平,耿凡等.气固两相流动与数值模拟[M].南京:东南大学出版社,2013.