CAJ | 학술논문

无焰燃烧具有降低氮氧化物(NO_x)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NO_x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);NO_x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1 700 K,热力型NO相对于有焰燃烧锐减;快速型NO极低;N_2O转化型NO成为主要的NO_x生成途径.
무염연소구유강저담양화물(NO_x)배방적우점.채용우합골가화학반응궤리적와모산개념(EDC)모형,대모상온진기무염연소과로적NO_x생성과정진행료삼유수치모의,병진행료실험험증.분석표명,해모형모의결과여실험측시결과부합교호;무염연소가이실현초저NOx배방,기마이분수저우20×10~(-6);NO_x주요재사류하유주위일개교관엄적공간생성;유우반응구가관,연소실최고온도저우1 700 K,열력형NO상대우유염연소예감;쾌속형NO겁저;N_2O전화형NO성위주요적NO_x생성도경.
Flameless combustion enjoys the merit of reducing NO_x 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 NO_x 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 NO_x emissions with the emission concentration being below 20×10~(-6).NO_x 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 N_2O-transformed type NO becomes the main route for the generation of NO_x.