旋流燃烧氮氧化物生成的研究进展  

Advances in Studies on Nitric-Oxide Formation in Swirling Combustion

作　　者：周力行[1] ZHOU Li-xing(Department of Engineering Mechanics,Tsinghua University,Beijing,China,Post Code :100084)

机构地区：[1]清华大学工程力学系,北京100084

出　　处：《热能动力工程》2019年第1期1-10,共10页Journal of Engineering for Thermal Energy and Power

基　　金：973国家重点基础研究专项经费资助子课题(G1999-0222-7);国家自然科学基金(51390493)~~

摘　　要：通过实验研究和所提出的双流体两相湍流模型以及湍流反应的二阶矩模型的数值模拟,对不同旋流数下的轴对称甲烷-空气湍流扩散燃烧和旋流煤粉燃烧的氮氧化物生成进行了研究。实验中为了研究旋流数对燃料型NO的影响,在燃料中加入少量氨模拟燃料氮。实验和数值模拟结果表明,随着旋流数的增大,热力型NO的排放先上升后下降,而总NO和燃料型NO的排放则先下降后上升,有一个使NO排放最低的旋流数;旋流数的增大先使湍流强度下降然后又使其稍有上升;而使进口附近的温度先上升然后稍有下降;热力型NO的生成受温度的影响更大,而燃料型NO的生成受湍流混合的影响更大。研究结果对旋流燃烧室或燃烧器的设计中如何通过控制湍流来降低NO排放有应用意义。The nitric-oxide formation in axi-symmetrical methane-air swirling turbulent diffusion combustion and pulverized-coal combustion was studied by both experiments and numerical simulation using the proposed two-fluid two-phase turbulence model and second-order moment turbulence-chemistry model.In order to study the effect of swirl number on fuel NO,a small amount of ammonia was added to the gas fuel in experiments.The experimental and simulation results indicate that as the swirl number increases,the thermal NO at first increases and then decreases,whereas the total NO and fuel NO at first decreases and then increases.There is a swirl number at which the NO emission is minimal.The increase of swirl number causes at first the reduction of turbulence and then the slight increase of turbulence.It leads to at first the temperature rise and then the temperature fall in the near-inlet region.The thermal NO is more affected by the temperature and the fuel NO is more affected by the turbulent mixing.These research results are meaningful for application in designing swirl combustors and burners to reduce NO emission by controlling the turbulence.

关 键 词：氮氧化物生成 湍流旋流燃烧 旋流煤粉燃烧 

分 类 号：TK16[动力工程及工程热物理—热能工程]