• CN:11-2187/TH
  • ISSN:0577-6686

›› 2013, Vol. 49 ›› Issue (18): 159-166.

• 论文 • 上一篇    下一篇

消除大容量低NOx切向燃煤锅炉烟温偏差现场试验

刘福国;徐伟;胡代军;咸兰辉   

  1. 山东电力集团公司电力科学研究院;大唐黄岛发电有限责任公司
  • 发布日期:2013-09-20

Field Tests Elimination of the Gas Temperature Deviation in Large Scale, Advanced Low NOx, Tangentially Fired Pulverized Coal Boiler

LIU Fuguo;XU Wei;HU Daijun;XIAN Lanhui   

  1. Shandong Electric Power Research Institute Datang Huangdao Power Generation Co., Ltd.
  • Published:2013-09-20

摘要: 回顾切向燃烧的技术发展,分析最新设计的大容量切向燃烧系统在降低NOx排放和控制烟温偏差方面的技术特点。在一台660 MW锅炉上,进行气温偏差的调整试验,调整的主要思路是在保证恰当的空气分级、满足环保要求的NOx排放的情况下,采用分离燃尽风的水平角度来协调消旋所需要的旋转动量矩;定量研究燃烧器调温摆角、炉膛风箱压差、分离燃尽风水平角度和风量以及紧凑燃尽风风量对炉膛上部的分隔屏出口气温偏差的影响,结果表明,该锅炉经过优化调整后,消除近年来一直困扰电力生产的炉膛烟温偏差问题,并保证较低的NOx排放量449.0 mg /m3和较高的燃烧效率;提出在实际生产中将该类大容量低NOx切向燃煤锅炉的气温偏差投入自动控制的设想。

关键词: NOx排放, 残余旋转, 煤燃烧, 切向燃烧锅炉, 烟温偏差

Abstract: The developments of coal tangentially fired technology are concisely reviewed and technical details of reducing NOx emissions combined with alleviating the gas temperature deviation are discussed for a newly designed combustion system in pulverized coal boiler. Field tests are carried out to alleviate the steam temperature deviation in the crossover pass of a 660 MW boilers, major attention was paid to the coordination of the rotational momentum required for the residual swirl elimination with the air staged flow necessary for reducing NOx emissions by the changes in yaw angles of separated over-fire air. The effects of nozzle tilt angle for reheater steam temperature regulation, pressure difference of furnace with wind box, flow-rates and yaw angles of over-fire air, are quantitatively investigated on steam temperature deviation in division platen superheaters in the upper furnace, it shows that the gas temperature deviation are eliminated in tangentially fired pulverized coal boiler by field combustion optimization, and keeping low NOx emissions of 449.0 mg / m3 and higher combustion efficiency in the meantime. Suggestions of putting steam temperature deviation into automatic control are proposed in large scale, advanced low NOx, tangentially fired pulverized coal boiler.

Key words: Coal combustion, Gas temperature deviation, NOx emissions, Residual swirl, Tangentially fired boiler

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