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以1台670 t/h煤粉锅炉为对象进行了热态试验,研究了煤粉锅炉在不同燃烧条件下NOx的排放特性.采用在线烟气分析仪对烟气成分进行分析,并通过化学分析获得了飞灰中的可燃物含量.改变二次风配风方式、炉膛出口氧量、周界风风门开度以及磨煤机组合方式等影响因素,对锅炉热效率、飞灰可燃物以及NOx排放浓度进行测量和分析,获得了可减少NOx排放并保持较高燃烧效率的合理燃烧方式:采用均等配风,炉膛出口氧量为2.25%左右,周界风风门开度为15%,采用ABC层的磨煤机组合方式.
A 670 t / h pulverized coal fired boiler was used as a test object to study the thermal characteristics of NOx emission under different combustion conditions of pulverized coal fired boilers. The flue gas composition was analyzed by on-line flue gas analyzer and analyzed by chemical analysis Obtained the content of combustibles in fly ash.Change factors such as secondary air distribution, furnace outlet oxygen, ambient air damper opening and coal mill combination and other factors, the boiler thermal efficiency, fly ash combustibles and NOx emission concentration Measurement and analysis, obtained a reasonable combustion mode that can reduce NOx emissions and maintain high combustion efficiency: Equal air distribution, the furnace outlet oxygen is about 2.25%, the perimeter air damper opening is 15%, using ABC layer mill Combination way.