柴油机颗粒后处理装置中沉积灰分的理化特性和形成机理研究

项目名称： 柴油机颗粒后处理装置中沉积灰分的理化特性和形成机理研究

项目编号： No.51476012

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 能源与动力工程

项目作者： 葛蕴珊

作者单位： 北京理工大学

项目金额： 80万元

中文摘要： 灰分是残留在柴油机颗粒物后处理装置上的，在再生过程中不能完全燃烧的残留部分，需要定期进行人工处理。后处理装置中残留灰分的不断累积导致柴油机排气背压逐渐增加，影响柴油车的燃油经济性和颗粒物再生控制策略。后处理装置中的灰分主要来源于润滑油灰分，与润滑油消耗量、润滑油中的灰分、硫含量、磷含量等关系密切，与后处理装置结构、基体材料以及发动机的运行工况、再生方式等密切相关。本项目重点研究柴油机各种颗粒物后处理装置（DPF、POC和DOC）中残留灰分的累积特性、灰分在DPF通道中的分布特性、灰分的物理化学特性，润滑油消耗量、润滑油灰分、润滑油中的磷化物和硫化物对后处理装置残留灰分的影响，以及柴油灰分对后处理装置中残留灰分的影响，研究柴油机运行工况对后处理装置中残留灰分的影响，研究灰分残留对柴油机排气背压的影响。在上述研究的基础上，提出考虑灰分残留量的后处理装置再生控制策略低灰分润滑油设计要点。

中文关键词： 柴油机；颗粒物；排放控制

英文摘要： Inorganic components can not be burnt or oxidized and thereby remain in after-treatment systems of diesel engines are called ash. Ash temporally amasses in after-treatment systems along with engine operations. Excessive accumulation of ash gives rise to an increase in exhaust back pressure, which obscures fuel economy and regeneration strategy of diesel vehicle. Ash contained in lubricants primarily contributes to ash deposit in after-treatment systems. In addition to lubricant ash, the formation of ash deposit highly depends on lubricant consumption, sulfur and phosphorus contents in lubricant, structure of after-treatment system, base material, engine operating condition and mode of regeneration. In this case, ash accumulation mechanisms in DPF, POC and DOC, ash distribution features in DPF as well as physical and chemical properties of ash are of scopes. Besides, effects of ash, metallic additives, sulfides and phosphides in lubricants and ash contained in diesel on ash accumulation in DPF will be investigated. This study will also look into the influences of engine operating conditions upon ash accumulation in DPF. The correlation between ash deposit and exhaust back pressure will be established as well. Based on aforementioned studies, a regeneration strategy for diesel engine after-treatment systems considering ash accumulation will be proposed. Meanwhile, key features of low-ash lubricant will be suggested.

英文关键词： Diesel Engine;Particulate Matter;Emission Control