300MW四角切圆煤粉锅炉燃烧和NO_x排放的数值模拟

Numerical Simulation of Combustion and Nitrogen Oxides Generation Process in a 300MW Tangentially Pulverized Coal Fired Boiler

运用国际上最先进的TASCFLOW软件平台与大型燃煤锅炉炉膛的数值模拟计算软件COALFIRE,对1台300MW四角切圆煤粉锅炉炉内流动、传热、燃烧及污染物的排放规律进行了数值模拟。结果表明:整个炉膛温度最高的地方出现在燃烧器区域;炉内各组分浓度分布与温度分布有密切的关系;炉膛出口氧量为6.4%左右;NOx的生成主要在炉膛的燃烧器区域,沿炉膛高度浓度逐渐减小。同时也得出了炉内壁面热负荷的分布规律。

Numerical simulation of flow, heat transfer, combustion and pollution release law in a 300 MW tangentially coal fired boiler is performed on international advanced TASCFLOW software platform and numerical simulation software COALFIRE of coal fired furnace. The results show the highest temperature area is near burners. Each species concentration has close relation with the temperature distribution. Furnace outlet O2 concentration is about 6.4%. A deal of nitrogen oxides is generated in the burners zone. With increase of furnace height, nitrogen oxides concentration deck. It concludes surface heat flux distribution laws on furnace wall.