Diesel Exhaust Clarification by a High-Pressure Injection in Combination with Selective Exhaust Gas Recirculation

通过高压喷射结合选择性废气再循环来净化柴油机废气

基本信息

批准号：
04555048
负责人：
IKEGAMI Makoto
金额：
$ 10.24万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
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

项目摘要

This study dealt with a novel diesel engine system that uses high-pressure injection and selective exhaust gas recirculation, with an objective of finding out the possibility of a significant reduction of particulate matter and oxides of nitrogen from diesel engines. A High-pressure injection offers an effective means to reduce particulates. For this reason, a fully electronic controlled high-pressure injection system was first developed. The system uses hydraulic spool acceleration and oil-hammering in a convergent pipeline. The characteristics of this injection system were investigated in detail. Tests were made using the injection system at a direct-injection diesel engine with optimal nozzle-orifice determined by theoretical study. The result shows that particulate matter at a higher load and oxides of nitrogen at middle load are reduced successfully on account of the fact that the injection pressure increases with the engine load. According to observations of diesel flame by high- … More speed photography, fluctuations of flame luminosity is reduced at high-pressure injection.A further reduction of oxides of nitrogen is intended to use selective exhaust gas recirculation using triatomic gases of carbon dioxide and water both being extracted from the exhaust. These triatomic gases have higher heat capacity and as a result combustion temperature is well reduced enough to suppress nitric oxides. To establish the selective water recirculation, system, effects of the introduction of water or moisture in intake air on reduction of oxides of nitrogen were first investigated experimentally. Based on the results, prediction were made for the effect of recirculation of water that is condensed from exhaust gas for various engine loads. It was found that a remarkable reduction of nitric oxide is obtainable at higher loads, because of greater extraction of water from exhaust. Furthermore, the recirculation system of carbon dioxide in exhaust gas was designed. The system employed monoethanohl-amine solvent as chemical absorbance. A prototype system of selective recirculation combined with high-pressure injection system is established successfully. Less

这项研究处理了一种新型的柴油发动机系统，该系统使用高压注入和选择性的排气再循环，目的是发现从柴油发动机中显着减少了特定物质和氮的氧化物的可能性。高压注射提供了减少颗粒物的有效手段。因此，首先开发了完全电子控制的高压注射系统。该系统在收敛管道中使用氢化线轴加速度和燃油。该注射系统的特征进行了详细研究。使用注射系统在直接注射柴油发动机上进行测试，并通过理论研究确定最佳喷嘴孔。结果表明，由于注入压力随发动机负荷增加而成功减少了较高的载荷下的特定物质和氮气在中载下的氧化物。根据高压摄影的高速摄影观察到柴油火焰的观察，在高压注射时降低了火焰光度的波动。氮的氧化物进一步降低，旨在使用选择性的废气再循环，使用二氧化碳和水的三局部气体循环。这些三局的气体具有较高的热容量，因此压缩温度足以抑制一生氧化物。为了建立选择性水的再循环，系统，在进气中引入水或水分对氮氧化物还原的影响，首先是通过实验研究的。根据结果，对各种发动机负荷的排气凝结水的再循环作用进行了预测。已经发现，由于水从排气中提取更多的水，在较高的载荷下可显着减少一氧化氮。此外，设计了废气中二氧化碳的再循环系统。该系统采用单乙烷 - 胺溶剂作为化学吸光度。成功建立了与高压注入系统结合使用的选择性再循环的原型系统。较少的