CAJ | 학술논문

为提高SCR系统的转化效率 ,提出紧凑型DOC-混合器-SCR后处理系统 ,建立了3种不同结构的后处理模型.采用计算流体力学(CFD)结合化学反应动力学的方法 ,建立了柴油机SCR-NOx 催化器三维数值模型 ,该模型包含尿素水溶液喷射、液滴蒸发和热解、NOx 催化还原化学反应整个尾气后处理过程 ,得到了紧凑型后处理系统的湍流动能场、速度流场、浓度场的分布规律 ,并与传统型后处理系统模拟仿真结果进行对比.研究结果对柴油机后处理系统设计具有参考价值.
위제고SCR계통적전화효솔 ,제출긴주형DOC-혼합기-SCR후처리계통 ,건립료3충불동결구적후처리모형.채용계산류체역학(CFD)결합화학반응동역학적방법 ,건립료시유궤SCR-NOx 최화기삼유수치모형 ,해모형포함뇨소수용액분사、액적증발화열해、NOx 최화환원화학반응정개미기후처리과정 ,득도료긴주형후처리계통적단류동능장、속도류장、농도장적분포규률 ,병여전통형후처리계통모의방진결과진행대비.연구결과대시유궤후처리계통설계구유삼고개치.
In order to improve the conversion efficiency of SCR system ,a compact DOC-mixer-SCR aftertreatment system was put forward and three kinds of aftertreatment models were built .With the aid of computational fluid dynamic (CFD) coupled with chemical reaction dynamics ,a 3D model of SCR-NOx catalytic converter was established .With the model ,the whole after-treatment process including the injection of urea aqueous solution ,the evaporation and thermal decomposition of droplet and NOx catalytic reaction was simulated and the distribution law of turbulent kinetic energy field ,velocity field and concentration field was acquired .In addition ,the simulated results were compared with those of traditional aftertreatment system .The re-search results provide the reference for the design of aftertreatment system .