某重型燃气轮机NO_x排放性能反应动力学数值计算  

Reaction Kinetic Simulation of NO_x Emission Performance for a Heavy Duty Gas Turbine

作　　者：刘爱虢[1] 朱悦[1] 陈保东[1] 曾文[1] 翁一武[2] 刘凯[1] 王成军[1] 

机构地区：[1]沈阳航空航天大学航空航天工程学院,沈阳110136 [2]上海交通大学机械与动力工程教育部重点实验室,上海200240

出　　处：《上海交通大学学报》2017年第11期1383-1390,共8页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(51476106);航空科学基金项目(2015ZB54003)资助

摘　　要：借助耦合CH4反应动力学模型与计算流体力学(Computational Fluid Dynamics,CFD)计算软件,对某重型燃气轮机燃烧室单个火焰筒的燃烧过程进行了研究,分析了导致NO_x排放超标的原因,调整了不同燃烧区的燃料分配,分析了燃料分配对NO_x排放的影响.结果表明,导致NO_x排放超标的原因为环形区、均匀区燃料/空气混合的不均匀性和值班区、均匀区燃料流量过大导致的局部温度过高;将值班区燃料和均匀区燃料的体积流量比例分别调整为4%和30%,会导致主燃烧区温度升高,NO_x排放由标准状态141.7mg/m^3升高至175.5mg/m^3;将值班区燃料和均匀区燃料比例分别调整为2%和26%,会降低主燃烧区温度,使NO_x排放降低至119.5mg/m^3,其中66.3mg/m^3来自于环形区.单纯地进行燃料调节,不能满足NO_x排放要求,还需要对环形区和均匀区结构进行调整,以增加混合的均匀性.The combustion process of single chamber flame tube of a heavy duty gas turbine combustor is studied by coupling of CH4 reaction kinetics model and computational fluid dynamics （CFD） software. Analysis of the causes of excessive NOw emissions is completed. The fuel distribution in different combus- tion zones is adjusted to study the effect of fuel distribution on NOx formation. Results show that high NO, emissions are due to high temperature caused by the fuel/air mixing ununiformity in annular and uni- form zones and the fuel flow is too high in the main combustion zone. Adjusting the fuel flow of pilot zone and uniform zone respectively to 4% and 30% can increase the NOv emission from 141.7 mg/m^3 to 175.5 mg/m^3. Adjusting the fuel flow of pilot zone and annular zone respectively to 2% and 26% can decrease the NOx emission to 119.5 mg/ma , in which 66.3 mg/^3a is from the annular region. The requirement of NOx emissions cannot be met only by adjusting the fuel distribution, but also by adjusting the structure of the annular and uniform zones to increase mixing uniformity.

关 键 词：重型燃气轮机 燃料分配 反应动力学特性 燃烧特性 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]