无焰燃烧NO_x生成的数值分析和实验研究  

Numerical Analysis and Experimental Study of NO_x Generation in Flameless Combustion

作　　者：王宝源[1] 俞瑜[1] 林其钊[1] 邢献军[2] 

机构地区：[1]中国科学技术大学热科学和能源工程系,安徽合肥230027 [2]安徽省产品质量监督检验研究院,安徽合肥230051

出　　处：《热能动力工程》2009年第6期787-791,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家863计划基金资助项目(2006AA05Z210)

摘　　要：无焰燃烧具有降低氮氧化物(NOx)排放的优点。采用耦合骨架化学反应机理的涡耗散概念(EDC)模型,对某常温进气无焰燃烧锅炉的NOx生成过程进行了三维数值模拟,并进行了实验验证。分析表明,该模型模拟结果与实验测试结果符合较好;无焰燃烧可以实现超低NOx排放,其摩尔分数低于20×10-6;NOx主要在射流下游周围一个较宽广的空间生成;由于反应区加宽,燃烧室最高温度低于1 700K,热力型NO相对于有焰燃烧锐减;快速型NO极低;N2O转化型NO成为主要的NOx生成途径。Flameless combustion enjoys the merit of reducing NOx emissions.By adopting an eddy dissipation concept(EDC) model based on a coupled skeleton chemical reaction mechanism,a three-dimensional numerical simulation and an experimental verification have been performed of the NOx generation process of a flameless combustion boiler featuring a normal-temperature air admission.It has been found from an analysis that the simulation results obtained by using the model in question are in relatively good agreement with the test actual measuring ones.The flameless combustion can result in excessively low NOx emissions with the emission concentration being below 20×10-6.NOx is generated mainly around a relatively wide space downstream of the jet flow.As the reaction zone is widened,the highest temperature in the combustion chamber is lower than 1 700 K and NO of the thermal type is sharply reduced relative to that of the flame combustion.The fast speed type NO amount is extremely low and the N2O-transformed type NO becomes the main route for the generation of NOx.

关 键 词：无焰燃烧 涡耗散概念(EDC) 氮氧化物(NOx) 减排 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]