电除尘器进口烟箱结构设计对气流分布的影响及数值模拟优化

华电技术 ›› 2019, Vol. 41 ›› Issue (9): 6-11.

电除尘器进口烟箱结构设计对气流分布的影响及数值模拟优化

1.中国大唐集团科学技术研究院有限公司华中电力试验研究院，郑州〓450000；2.信阳市发改委节能监察局，河南信阳〓464000

出版日期:2019-09-25 发布日期:2019-10-18

Effect of smoke box structure at ESP inlet on gas flow distribution and optimization based on numerical simulation

1.CentralChina Electric Power Test Research Institute，China Datang Corporation Science and Technological Research Institute Company Limited，Zhengzhou 450000, China; 2.Energy Conservation Supervision Bureau，Xinyang Development and Reform Commission，Xinyang 464000, China

Online:2019-09-25 Published:2019-10-18

摘要/Abstract

摘要：

某电厂2×300MW机组配套的电除尘器原进口烟箱结构不对称且导流板和多孔均布板设置不合理，导致气流分布不均匀。对进口烟箱进行数值模拟研究，重点考察了进口烟箱结构对气流分布状况的影响：发现导流板主要起到均匀分配两室烟气流量，调整烟气流向的作用，但对气流均匀性的改善具有一定局限性；而多孔均布板能有效解决气流速度分布不均的问题，其优化布置形式也存在一定规律，即当安装间距由大变小、开孔率由小变大时，更容易获得良好的气流分布均匀性，有利于提高除尘效率。通过对比进口烟箱内流场现场测试和数值模拟结果，证实了数值模拟的准确性和可靠性。

关键词:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">电除尘器, 进口烟箱, 气流分布, 流量偏差, 数值模拟, 优化

Abstract:

Asymmetric structure of original inlet smoke boxes and irrational arrangement of deflectors and orifice plates of an electrostatic precipitator (ESP) for 2×300MW units in a power plant were conducive to the flow field nonuniformity.Numerical simulation was made on inlet smoke box, which focused on the influence of its structure on airflow distribution. It is found that deflectors play a major role in balancing gas distribution between two smoker boxes and adjusting smoke flow direction, however, they have limited improvement on airflow distribution uniformity.The orifice plates can effectively improve the uniformity of gas velocity distribution.There is regularity in the optimized layout of orifice plates which is the uniformity of airflow distribution can be improved with the decrease of orifice plate installation spaces and the increase of the percentage of open areas.With a better airflow distribution uniformity, the dustremoval efficiency can be raised. By analyzing field test results and the numerical simulation results, the accuracy and reliability of numerical simulation were confirmed.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">ESP, inlet smoke box, airflow distribution, flow rate deviation, numerical simulation, optimization

熊远南1，汪永威1，陈英武2. 电除尘器进口烟箱结构设计对气流分布的影响及数值模拟优化[J]. 华电技术, 2019, 41(9): 6-11.

XIONG Yuannan1，WANG Yongwei1，CHEN Yingwu2. Effect of smoke box structure at ESP inlet on gas flow distribution and optimization based on numerical simulation[J]. Huadian Technology, 2019, 41(9): 6-11.

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