摘要
运用计算流体力学手段对柴油机SCR催化器内排气流动、尿素水溶液喷射雾化、液滴蒸发、尿素热解和催化剂表面化学反应等整个NOx后处理过程进行了模拟,通过考察不同方案下载体前端面的尿素浓度分布及NOx转化率,研究了还原剂添加位置、喷嘴型式以及催化器入口扩张管形状等因素对催化器系统NOx转化性能的影响,研究结果为催化器的优化设计提供了指导依据。
With aid of Computational Fluid Dynamics （CFD） method, the flow process inside the diesel Urea-SCR DeNOx catalytic converter was simulated, including the injection and atomization of urea solution, droplet evaporation, urea thermolysis and catalytic reactions in the monolith. The influence of injection position, injector shape and converter shape on DeNOx performance was investigated by the NH3 concentration uniformity and NOx conversion. The results can provide some guidelines for the design and optimization of SCR systems.
出处
《车用发动机》
北大核心
2007年第1期44-47,共4页
Vehicle Engine
基金
国家863计划子课题(2001AA64304003)
中国科学院知识创新工程项目(KZCX3-SW-430)
