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Numerical simulation of the heat transfer and NO X emissions in a 660 MW tangentially fired pulverised-coal supercritical boiler
Heat and Mass Transfer ( IF 2.2 ) Pub Date : 2020-06-17 , DOI: 10.1007/s00231-020-02884-z
Sankar G , Chandra Sekhar Dhannina , Santhosh Kumar D , Balasubramanian K R

Numerical simulation of the influence of operating conditions of the furnace on its performance characteristics like heat flux distribution, Furnace Exit Gas Temperature (FEGT) and NOx emission levels was performed for a tangentially fired pulverised coal boiler. The results revealed that the FEGT and NOx emission are slightly higher when the top seven coal nozzles are in operation compared to the bottom seven coal nozzles. While the increase in burner tilt led to an increased FEGT, the least NOx emission was obtained for the burner tilt with 0°. The NOx emission started to increase with both increase and decrease in tilt from 0°. In addition, the FEGT and NOx emission were directly and inversely proportional to the percentage of SOFA (Separated OverFire Air) opening respectively. NOx emission was lower by around 7.5% when the air staging was done with the top-most SOFA nozzle instead of the bottom-most SOFA nozzle. However, the FEGT was higher in the former case.



中文翻译:

660兆瓦切向燃烧煤粉超临界锅炉传热和NO X排放的数值模拟

对像热通量分布其性能特点炉的操作条件的影响的数值模拟,炉膛出口气体温度(FEGT)和NO X为切向,进行排放水平煤粉锅炉。结果表明,顶部七个煤喷嘴运行时的FEGT和NO x排放量比底部七个煤喷嘴运行时的高。而在导致了燃烧器摆角的增加而增加FEGT中,至少NO X得到了该燃烧器摆角0°发射。从0°开始,随着倾斜的增加和减少,NO x排放开始增加。此外,FEGT和NO x排放分别与SOFA(分离式过火空气)打开的百分比成正比和成反比。NO X时,空气分级,用最上面的喷嘴SOFA代替最底部SOFA喷嘴进行发射是通过在7.5%左右以下。但是,前者的FEGT较高。

更新日期:2020-06-17
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