摘要
非道路国四排放标准将于2022年12月发布实施。相较于国三,国四标准对NO_(x)和PM有更严格限制。为应对国四排放法规,业内主要技术路线是在排气系统中增加氧化装置(DOC)、过滤装置(DPF)及还原转化装置(SCR),分别实现对尾气中HC、CO、PM及NO_(x)的控制。建立了一种后处理方案设计评价方法,以降低排气背压、减少尿素结晶风险、提高载体前混合均匀性等为优化指标,在约束空间下,指导后处理系统管路、混合器结构及布置等方面优化,提高后处理系统性能。
In this paper, the main bearing housing bore and main bearing of a diesel engine were studied, and the abstract:The non-road NationalⅣemission standard will be released and implemented in December 2022.Compared with the National Three,the NationalⅣstandard has stricter restrictions on NO_(x) and PM.In response to the NationalⅣemission regulations,the main technical route in the industry is to add an oxidation device(DOC),a filter device(DPF)and a reduction conversion device(SCR)in the exhaust system,respectively,to realize the reduction of HC,CO,PM and NO_(x) in the exhaust gas control.In this paper,an evaluation method for the design and evaluation of a post-treatment scheme is established.Taking reducing exhaust back pressure,reducing the risk of urea crystallization,and improving the mixing uniformity before the carrier as the optimization indicators,under the constrained space,it guides the structure of the pipeline and mixer of the post-treatment system.And the layout and other aspects are optimized to improve the performance of the post-processing system.
作者
张晓超
刘伊滨
邢首辰
孙黎明
ZHANG Xiaochao;LIU Yibin;XING Shouchen;SUN Liming(Luoyang Tractor Research Institute Co.,Ltd.,Luoyang 471039,China;State Key Laboratory of Power System of Tractor,Luoyang 471039,China)
出处
《拖拉机与农用运输车》
2022年第5期35-38,共4页
Tractor & Farm Transporter
关键词
非道路柴油机
后处理系统
匹配分析
Off-road diesel engine
Post-processing system
Match analysis