降低燃煤机组SCR脱硝系统催化剂磨损的流场优化

doi:10.11930/j.issn.1004-9649.201708274

中国电力 ›› 2018, Vol. 51 ›› Issue (7): 152-156,169.DOI: 10.11930/j.issn.1004-9649.201708274

降低燃煤机组SCR脱硝系统催化剂磨损的流场优化

雷鉴琦

大唐东北电力试验研究院有限公司, 吉林长春 130012

收稿日期:2017-09-25 修回日期:2018-02-26 出版日期:2018-07-05 发布日期:2018-07-31
作者简介:雷鉴琦(1990-),男,工学硕士,工程师,从事电站环保设备节能与结构优化等方面的研究,E-mail:80520010@qq.com
基金资助:
吉林省科技发展计划资助项目（20180201001SF）。

Flow Field Optimization on the Catalyst Layer Breakage Failure of the SCR-DeNO_x System for a Coal-fired Power Plant

LEI Jianqi

Datang Northeast Electric Power Test and Research Institute Co., Ltd., Changchun 130012, China

Received:2017-09-25 Revised:2018-02-26 Online:2018-07-05 Published:2018-07-31
Supported by:
This work is supported by Jilin Province Scientific and Technological Development Program (No.20180201001SF).

摘要/Abstract

摘要： 针对国内某300MW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。

关键词: 燃煤机组, 催化剂磨损, SCR脱硝, 数值模拟, 导流板, 圆盘静态混合器

Abstract: 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.

Key words: coal-fired power unit, catalyst breakage, SCR-based denitration, numerical simulation, deflector, disk static mixer

中图分类号:

X511
TM621.9

雷鉴琦. 降低燃煤机组SCR脱硝系统催化剂磨损的流场优化[J]. 中国电力, 2018, 51(7): 152-156,169.

LEI Jianqi. Flow Field Optimization on the Catalyst Layer Breakage Failure of the SCR-DeNO_x System for a Coal-fired Power Plant[J]. Electric Power, 2018, 51(7): 152-156,169.

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https://www.electricpower.com.cn/CN/Y2018/V51/I7/152

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降低燃煤机组SCR脱硝系统催化剂磨损的流场优化

Flow Field Optimization on the Catalyst Layer Breakage Failure of the SCR-DeNO_x System for a Coal-fired Power Plant

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降低燃煤机组SCR脱硝系统催化剂磨损的流场优化

Flow Field Optimization on the Catalyst Layer Breakage Failure of the SCR-DeNOx System for a Coal-fired Power Plant

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Flow Field Optimization on the Catalyst Layer Breakage Failure of the SCR-DeNO_x System for a Coal-fired Power Plant