摘要
为了提高废气处理燃烧器喷嘴的使用寿命、降低排放物中NOx的浓度,采用Realizablek-ε模型对废气处理燃烧器三维流动和燃烧进行了数值模拟。结果显示:燃烧室内的流动、燃烧、化学反应以及排放物中NOx的浓度与燃烧器的导流片角度和燃烧器结构密切相关,包括内部流道的形状和面积。据此提出了燃烧器的两种结构修改方案。数值模拟结果表明:当去掉导流片从而增大空气流通截面积并减小流动阻力后,燃烧器内的速度和压力分布合理,高温区位置后移,燃烧和化学反应效率提高,排放物NOx的浓度明显降低。其中一种结构改进的燃烧器投入使用后,经检测NOx的浓度减少9.5%。
Three-dimensional turbulent flow and combustion in a waste gas burner was numerically simulated using the Realizable k-ε model to improve the combustor nozzle service life and reduce the exhaust NO_x concentration. The results show that the burner design, including the flow channel geometry, the surface area, and the guide vane angles, strongly affects the flow, the combustion in the firebox and the exhaust. Numerical simulations were used to develop two modified geometries with more reasonable velocity and pressure distributions in the firebox with the high-temperature zone moved to the back of the on-port flame. The combustion and chemical reaction efficiencies are improved with the NO_x concentration significantly reduced when the guide vanes are removed to increase the air flow sectional area and reduce the flow drag. The NO_x concentration for one of the improved devices in operation is reduced by 9.5%.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第5期666-669,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家"八六三"高技术项目(2002AA335050)
关键词
燃烧器
结构改进
排放气体
数值模拟
burner
frame improvement
exhausted gas
numerical simulation
