王建东1,2, 谭治学1,2, 李云刚1,2，王佳兴1,2, 杨新达1,2

1.内燃机可靠性国家重点实验室，山东潍坊261061；2.潍柴动力股份有限公司发动机研究院，山东潍坊261061

摘要：根据尿素的结晶过程和生成机理，搭建基于反应动力学方程的结晶风险预测模型。分析影响结晶的关键因素，测试模型计算过程中的关键参数，提出以软硬结晶加权来表征尿素结晶风险程度。通过某重型柴油机尿素结晶过程的稳态工况试验和整车道路试验验证结晶风险预测模型。结果表明，结晶风险预测模型的预测一致性较好，能够及时预测结晶风险，为结晶清理时机提供最佳的判断指导。

关键词：选择性催化还原；结晶；风险；预测模型

Abstract:Combined with urea crystallization process and the formation mechanism, a method based on a set of reaction kinetics equations for crystallization prediction is set up. Based on the analysis of the key factors of crystallization, several key parameters are decided. The crystallization risk are designed as weighted sum of hard and soft urea crystallization. Experimental analysis of the urea crystallization process for a heavy diesel engine under different steady conditions is conducted, and the vehicle road test is performed additionally. The prediction model performed quite well, which represented as predicting the crystallization risk timely and providing the best judgment guidance for crystallization elimination.

Keywords:selective catalytic reduction; deposit; risk; prediction model