• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2014, Vol. 35 ›› Issue (1): 109-113.doi: 10.3969/j.issn.1000-7229.2014.01.021

• 发电技术 • 上一篇    下一篇

660 MW超超临界旋流对冲燃煤锅炉二次风配风方式对NOx分布影响的数值模拟

倪煜1,李德波2   

  1. 1.中国电力工程顾问集团公司,北京市 100120;2.广东电网公司电力科学研究院,广州市 510060
  • 出版日期:2014-01-01
  • 作者简介:倪煜(1983),男,博士,主要从事能源清洁利用技术、新能源技术及节能环保技术研究,E-mail:yni@cpecc.net; 李德波(1984),男,博士,主要从事煤粉燃烧污染物控制、大规模并行计算方法和程序开发等方面的研究,E-mail:ldbyx@126.com。

Numerical Simulation of Second Air Distribution Influence on Concentration of NOx Distribution for Swirl Opposed Wall Firing Pulverized Coal Boiler in 660 MW Ultra Supercritical Unit

NI Yu1, LI Debo 2   

  1. 1. China Power Engineering Consulting Group Corporation, Beijing 100120, China;2. Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou 510060, China
  • Online:2014-01-01

摘要:

为了研究二次风配风方式对NOx生成的影响,针对某电厂660 MW超超临界旋流燃煤锅炉,利用Ansys软件数值模拟研究了二次风配风方式对NOx生成规律。数值模拟的结果与现场实际情况较吻合,验证了数值模拟结果的有效性,主要结论有:炉膛燃烧器区域是NOx的主要生成区;在第1层和第2层燃烧器之间区域NOx浓度较高,然后沿炉高方向NOx浓度逐渐降低;随着燃尽风量的增加,炉内高度方向各个截面的NOx平均浓度降低;随着燃尽风量增加,炉膛出口截面NOx浓度逐渐降低,但下降量逐渐减少。

关键词: 超超临界机组, 前后墙对冲, 二次风配风, NOx分布, 数值模拟

Abstract:

 

In order to investigate the influence of second air distribution on NOx formation, this paper numerically simulated the NOx formation rule by using Ansys for the swirl pulverized coal boiler in a 660 MW ultra-supercritical power plant. The numerical results agree well with actual conditions, which verify the effectiveness of the numerical simulation results. The main results are summarized as follows: the burner in furnace is the mainly region of NOx formation; the concentration of NOx between the first layer and second layer of combustion zone is higher; the concentration of NOx decreases along the furnace height; with the increasing of burnout-air, the mean concentration of NOx at each cross-section zone decreases along the height of boiler, and the mean concentration of NOx at the burner outlet decreases, but the decreasing rate is more and more slow.

Key words: ultra supercritical unit, opposed wall firing, secondary air distribution, NOx distribution, numerical simulation