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Reduction of SOF Emission Due to Exhaust Catalyst in a Diesel Engine

通过柴油发动机中的排气催化剂减少 SOF 排放

基本信息

批准号：
04650169
负责人：
TSUNEMOTO Hideyuki
金额：
$ 0.38万
依托单位：
Kitami Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650169/
关键词：
Diesel Engine Exhaust Emission Combustion Chamber Shape 排気成分

项目摘要

To reduce tohe unburned HC and SOF emission, the effects of specifications of injection system were investigated at first year. At second year the influences of combustion chamber shapes and thermal insulation, and the exhaust catalyst system were experienced. The main results at second year are following :(1) The combustion chamber was modified to improve the mixture formation. The fuel spray impinges on a projection attached on the combustion chamber wall and mixes with air. Many kinds of projection shapes were tested. It was found that the unburned HC reduces with the combination of the round projection and the air turbulence.(2) To increase the wall temperature of combustion chamber, the various combustion chamber material, the insulation spacer between the combustion chamber and the piston base, and the combustion chamber with air gap in the chamber bottom were attempted. The HC emission in a light load condition decreases with increasing of combustion chamber insulation, however, the NO and smoke emission in a high load condition increase with the increasing of thermal insulation. To improve this demerit, the thermal insulation where the fuel spray does not impinge directly is effective.(3) The unburned HC and SOF emission due to the engine modification exceed our target level, yet. The exhaust catalyst needs to reduce these emissions. In this study it indicates that the pre-catalyst system which is attached the small catalyst in the front of main catalyst is effective to early catalyst reaction.

为了降低未燃HC和SOF的排放，在第一年研究了喷射系统参数的影响。在第二年的影响，燃烧室的形状和隔热，和排气催化剂系统的经验。第二年的主要研究成果如下：（1）对燃烧室进行了改进，改善了混合气的形成。燃油喷雾撞击在燃烧室壁上的一个突起上，并与空气混合。对多种投影形状进行了试验。结果表明，圆形投影和空气湍流的共同作用使未燃HC减少。(2)为了提高燃烧室壁温，尝试了不同的燃烧室材料、在燃烧室与活塞底座之间设置隔热垫以及在燃烧室底部设置气隙的燃烧室。低负荷时HC排放随燃烧室绝热程度的增加而降低，高负荷时NO和烟度排放随绝热程度的增加而增加。为了改善这一缺点，燃料喷雾不直接撞击的热绝缘是有效的。(3)未燃HC和SOF排放由于发动机的修改超过了我们的目标水平，但。排气催化剂需要减少这些排放。研究表明，在主催化剂前附加小催化剂的预催化剂体系对催化剂的早期反应是有效的。