内燃机工程2024，Vol.45Issue(6)：31-38,8.DOI:10.13949/j.cnki.nrjgc.2024.06.004
基于非道路用柴油机选择性催化还原混合器优化及验证研究
Research on Optimization and Verification of Selective Catalytic Reduction Mixer for Off-Road Diesel Engines
摘要
Abstract
In order to solve the problem that the loader space is small and the cylindrical post-processing cannot be arranged,a hybrid optimization and crystallization performance verification scheme of non-road diesel selective catalytic reduction(SCR)system with U-type structure was proposed.Through computational fluid dynamics(CFD),the turbulent motion,velocity field and ammonia(NH3)distribution uniformity of the typical mixer structure model of 3 U-type SCR systems for diesel engines under 3 typical working conditions were simulated and analyzed.The influences of different mixing structures on NH3 distribution and NOx conversion efficiency were studied.Based on the analysis of simulation results,some structural design schemes can accelerate the process of droplet breaking,hydrolysis and atomization,improve the distribution uniformity of NH3 and the NOx conversion efficiency of SCR system in the fresh state.But these schemes are more likely to generate and accumulate crystals,resulting in a decline in the NOx conversion performance of SCR system.Therefore,a new method was proposed to optimize the mixer scheme of U-type SCR system of diesel engine,which was designed with a combination of guide device,spoiler and vent plate,etc.A concentric internal and external cylinder static mixer structure was obtained.The duration of crystallization test failure of engine carrying loader was more than 28.0 h.关键词
选择性催化还原/混合器/均匀性/结晶Key words
selective catalytic reduction(SCR)/mixer/homogeneity/crystallization分类
能源科技引用本文复制引用
莫瑞,刘学渊,吴瑞婷,杨通云,乔梦雪,蔡文杰..基于非道路用柴油机选择性催化还原混合器优化及验证研究[J].内燃机工程,2024,45(6):31-38,8.基金项目
云南省教育厅科研基金项目(2022J0500) （2022J0500）
云南省农业联合面上基金项目(202101BD070001-110)Research Fund Project of Education Department of Yunnan Province(2022J0500) （202101BD070001-110）
Yunnan Agricultural Union General Fund Project(202101BD070001-110) （202101BD070001-110）
