PFI氢燃料内燃机NO_x排放特性的试验研究  

An Experimental Study on the NO_x Emission Characteristics of PFI Hydrogen Internal Combustion Engine

作　　者：段俊法[1] 刘福水[1] 孙柏刚[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《汽车工程》2014年第10期1175-1179,共5页Automotive Engineering

基　　金：国家自然科学基金(51276019);河南省教育厅科学技术攻关重点项目基础研究计划(14B470016)资助

摘　　要：对一台4缸进气道燃料喷射（PFI）氢内燃机进行试验,研究当量燃空比、点火提前角和热废气再循环对其NOx排放的影响和这些规律与转速的相关性。结果表明,当量燃空比是决定NOx的关键因素,在当量燃空比大于0.5时NOx排放随当量燃空比的增加急剧上升,在当量燃空比约为0.9时,出现接近10 000×10^-6的峰值;且转速越低,NOx排放的峰值越低,峰值对应的当量燃空比越小。当量燃空比在0.5-0.7范围内时,减小点火提前角可大大降低NOx排放,且转速越低,降低的程度越显著;采用热EGR也可显著减少NOx排放,且转速越低,效果越明显。A test is conducted to study the effects of the equivalent fuel air ratio（ FAR）,ignition advance angle,exhaust gas recirculation（ EGR） and engine speed on the NOxemission from a 4 cylinder port fuel injection（ PFI） hydrogen internal combustion engine. The results show that the equivalent FAR is the key factor to the formation of NOx. When the equivalent FAR is larger than 0. 5,the NOxemission increases quickly with equivalent FAR and reaches its peak（ 10,000 × 10^-6） at an equivalent FAR of around 0.9,and with the fall in engine speed the peak NOxemission lowers and corresponding equivalent FAR reduces; When the equivalent FAR is in the range of 0. 5 - 0. 7,the retard in ignition angle leads to the great reduction in NOxemission,and the lower the engine speed,the more the reduction in NOxemission; The adoption of hot EGR also results in obvious fall in NOxemission and the lower the engine speed,the more decrease the NOxemission.

关 键 词：进气道燃料喷射 NOX排放 当量燃空比 点火提前角 废气再循环 

分 类 号：U467.48[机械工程—车辆工程]