摘要
本文研究了废气再循环 (EGR)对涡轮增压柴油机NOX 排放的影响。通过将涡轮后的低压废气冷却后直接引入压气机前的低压进气中 ,实现自然EGR ,该方式产生的EGR率无法满足柴油机整个工况范围减低NOX 的要求。将涡轮后的低压废气冷却后通过压气机压入中冷器后的高压进气中 ,实现压力EGR ,采用足够大容量和压力的气泵 ,该方式可满足柴油机整个工况范围内减低NOX 的要求。实验表明 ,在本文所试验的工况范围内 ,自然EGR能降低NOX 排放 6 %～ 18% ,而压力EGR可降低NOX 排放 2 2 %～ 5 3% .
The effect of exhaust gas recirculation(EGR) on NO X emissions from turbocharged diesels was studied. Natural EGR was carried out by inducing the cooled low pressure exhaust gas after the turbocharger to the low pressure intake air directly before the compressor. Natural EGR is unable to reduce NO X sufficiently under all specified operating conditions. Pressurized EGR was accomplished through compressing the cooled low pressure exhaust gas after the turbocharger into the high pressure intake air after the intercooler. Pressurized EGR can decrease NO X to the specified degree under specified operating conditions. Engine tests show that NO X are decreased by approximately 6%～18% by natural EGR and 22%～53% by pressurized EGR.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2004年第3期372-375,共4页
Acta Armamentarii
基金
国家重点基础研究发展规划资助项目 ( 2 0 0 1CB2 0 92 0 1)
北京市教委基金资助项目 ( 0 1KJ 0 0 8)
关键词
柴油机
废气再循环
涡轮
NOx
power mechanical engineering, exhaust gas recirculation(EGR), turbocharged Diesel, natural EGR, pressurized EGR, NO X control
