杨丁1,2,
郭俊1,
刘栋栋1,
苏寅彪1,
安希忠2
1.福建龙净环保股份有限公司,龙岩 364000
2.东北大学冶金学院,沈阳 110819
基金项目: 国家重点研究计划(2016YFC0203703)
龙岩市基础研究与青年人才项目(2017LY82)
Flow field optimization of SCR DeNOx project for ultra-low emission retrofit
YE Xinglian1,2,,YANG Ding1,2,
GUO Jun1,
LIU Dongdong1,
SU Yinbiao1,
AN Xizhong2
1.Fujian Longking Co.Ltd., Longyan 364000,China
2.School of Metallurgy, Northeastern University, Shenyang 110819, China
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摘要:采用CFD数值模拟方法对某电厂400 MW机组烟气脱硝装置流场进行了诊断,分析了导致效率低、烟道积灰以及空预器磨损等问题的具体原因,之后对此脱硝装置流场进行优化。优化结果表明:在省煤器出口水平扩张段烟道增设导流板,消除了该区域的大范围涡流,有利于减轻烟道积灰,并使喷氨区域烟气速度分布均匀;将喷氨混合装置改成喷氨格栅+圆盘混合器型式,强化了氨氮混合,使首层催化剂入口氨浓度分布均匀性得到显著改善,有利于提高脱硝效率、降低氨逃逸率;在空预器上游烟道增设导流装置,提高了空预器烟气速度分布均匀性,有利于解决空预器磨损问题。通过流场优化后,提高了此脱硝装置脱硝效率,减轻和消除了烟道积灰及空预器磨损。
关键词: SCR脱硝/
提效改造/
数值模拟/
速度分布/
氨浓度分布/
流场优化
Abstract:Flow field in the flue gas denitrification reactor of a 400 MW unit in a coal-fired power plant was diagnosed by numerical simulation. Possible reasons were detailed for the current issues such as low denitrification efficiency, dust deposition in ducts as well as abrasion of air preheaters. Then the flow filed of denitrification reactor could be optimized and the results demonstrated that installing guide plates in the horizontal expansion section at the economizer outlet could eliminate the large-scale eddies in the duct, which was beneficial to reduce the dust deposition in the duct and uniformly distribute the flue gas velocity profile in the AIG area. After changing the original ammonia-nitrogen mixer into AIG + disk mixer type, the ammonia-nitrogen mixing effect was enhanced, and the distribution uniformity of the ammonia concentration in the first catalyst layer inlet can be improved remarkably, which can improve the denitrification efficiency and reduce the ammonia escape rate. Installing guide plates upstream the air preheater could improve the uniformity of flue gas velocity distribution, which was helpful to solve the problem of air preheater abrasion. By optimizing the flow field, the efficiency of the denitrification reactor can be improved, and the dust deposition in the duct and the abrasion of the air preheater can be reduced and eliminated.
Key words:SCR DeNOx/
efficiency improving retrofit/
numerical simulation/
velocity distribution/
ammonia concentration distribution/
flow field optimization.
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[1] | 杨颺. 烟气脱硫脱硝净化工程技术与设备[M]. 北京:化学工业出版社,2013 |
[2] | 杨超,张杰群,郭婷婷.SCR烟气脱硝装置烟气流场数值模拟[J]. 东北电力大学学报,2012,32(1): 66-70 |
[3] | 陈鸿伟,徐劲,李丽,等.SCR脱硝催化剂磨损及堆灰治理[J]. 电力科学与工程,2016,32(11):60-65 10.3969/j.issn.1672-0792.2016.11.011 |
[4] | 张翠珍,赵学葵. 大型燃煤机组SCR脱硝系统优化[J]. 环境工程学报,2015,9(12):5997-6004 |
[5] | 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 10.12030/j.cjee.201508193 |
[6] | 罗闽,赵伶玲,李偲宇.空气预热器硫酸氢铵积灰的数值研究[J].动力工程学报,2016,36(11):883-888 10.3969/j.issn.1674-7607.2016.11.005 |
[7] | 胡永锋,梁新磊. 燃煤电厂SCR法烟气脱硝装置常见问题及原因分析[J]. 华电技术,2015,37(11):62-79 |
[8] | 魏学静,安世辉,刘巍. 燃煤电厂SCR烟气脱硝技术改造后空气预热器堵塞问题处理[J]. 河北电力技术,2016,35(6):39-41 |
[9] | GAO Y H, LIU Q C,BIAN L T.Numerical simulation and optimization of flow field in the SCR denitrification system on a 600 MW capacity units[J].Energy Procedia,2012,14:370-375 10.1016/j.egypro.2011.12.944 |
[10] | DAKSHINAMOORTHY D,GUPTA A.Consider advanced modeling to control air emissions[J].Hydrocarbon Processing,2009,88(9):81-86 |
[11] | CHO J M, CHOI J W, HONG S H, et al.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] | HEIREDAL M L,JENSEN A D,THOGERSEN J R,et al.Pilot-scale investigation and CFD modeling of particle deposition in low-dust monolithic SCR DeNOx catalysts[J].AIChE Journal,2013,59(6):1919-1933 |
[13] | 张文志,曾毅夫.CFD技术在SCR脱硝系统中的应用[J]. 中国环保产业,2015(12):57-60 |
[14] | 温正,石良辰,任毅如. 流体计算应用教程[M]. 北京:清华大学出版社,2009 |
[15] | 周强强.SCR脱硝系统烟道气动流场数值模拟研究[D]. 大连:大连海事大学,2015 |
[16] | 周健,阎维平,石丽国,等.SCR反应器入口段流场均匀性的数值模拟研究[J]. 热力发电,2009,38(4):22-25 |
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SCR脱硝超低排放工程改造流场优化
叶兴联1,2,,杨丁1,2,
郭俊1,
刘栋栋1,
苏寅彪1,
安希忠2
1.福建龙净环保股份有限公司,龙岩 364000
2.东北大学冶金学院,沈阳 110819
基金项目: 国家重点研究计划(2016YFC0203703) 龙岩市基础研究与青年人才项目(2017LY82)
关键词: SCR脱硝/
提效改造/
数值模拟/
速度分布/
氨浓度分布/
流场优化
摘要:采用CFD数值模拟方法对某电厂400 MW机组烟气脱硝装置流场进行了诊断,分析了导致效率低、烟道积灰以及空预器磨损等问题的具体原因,之后对此脱硝装置流场进行优化。优化结果表明:在省煤器出口水平扩张段烟道增设导流板,消除了该区域的大范围涡流,有利于减轻烟道积灰,并使喷氨区域烟气速度分布均匀;将喷氨混合装置改成喷氨格栅+圆盘混合器型式,强化了氨氮混合,使首层催化剂入口氨浓度分布均匀性得到显著改善,有利于提高脱硝效率、降低氨逃逸率;在空预器上游烟道增设导流装置,提高了空预器烟气速度分布均匀性,有利于解决空预器磨损问题。通过流场优化后,提高了此脱硝装置脱硝效率,减轻和消除了烟道积灰及空预器磨损。
English Abstract
Flow field optimization of SCR DeNOx project for ultra-low emission retrofit
YE Xinglian1,2,,YANG Ding1,2,
GUO Jun1,
LIU Dongdong1,
SU Yinbiao1,
AN Xizhong2
1.Fujian Longking Co.Ltd., Longyan 364000,China
2.School of Metallurgy, Northeastern University, Shenyang 110819, China
Keywords: SCR DeNOx/
efficiency improving retrofit/
numerical simulation/
velocity distribution/
ammonia concentration distribution/
flow field optimization
Abstract:Flow field in the flue gas denitrification reactor of a 400 MW unit in a coal-fired power plant was diagnosed by numerical simulation. Possible reasons were detailed for the current issues such as low denitrification efficiency, dust deposition in ducts as well as abrasion of air preheaters. Then the flow filed of denitrification reactor could be optimized and the results demonstrated that installing guide plates in the horizontal expansion section at the economizer outlet could eliminate the large-scale eddies in the duct, which was beneficial to reduce the dust deposition in the duct and uniformly distribute the flue gas velocity profile in the AIG area. After changing the original ammonia-nitrogen mixer into AIG + disk mixer type, the ammonia-nitrogen mixing effect was enhanced, and the distribution uniformity of the ammonia concentration in the first catalyst layer inlet can be improved remarkably, which can improve the denitrification efficiency and reduce the ammonia escape rate. Installing guide plates upstream the air preheater could improve the uniformity of flue gas velocity distribution, which was helpful to solve the problem of air preheater abrasion. By optimizing the flow field, the efficiency of the denitrification reactor can be improved, and the dust deposition in the duct and the abrasion of the air preheater can be reduced and eliminated.