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本文研究在一台EMD公司的1715kW、二冲程、12-645E3型柴油机上采用废气再循环(EGR)、独立回路后冷却器和延迟喷油定时在减少排放和降低燃油消耗方面的优点,该型柴油机在北美广泛应用于船舶和机车。试验结果表明,采用EGR、4°静态喷油定时延迟和最低进气歧管温度,使得在US-EPA(美国环保局)干线牵引工作循环下氮氧化物(NOx)排放率比基准试验时减少了40%,而燃油消耗率并没有增加。颗粒物(PM)的排放率仅比基准水平增加7.5%。试验结果还表明,在US-EPA调车工作循环下NOx排放率比基准水平减少50.6%,与此同时燃油消耗改善2.8%。调车工作循环的加权PM排放率仅比基准水平增加12.7%。
This paper investigates the advantages of using exhaust gas recirculation (EGR) on an EMD 1715kW, two-stroke, 12-645E3 diesel engine with independent circuit aftercooler and delayed injection timing to reduce emissions and reduce fuel consumption. This model Diesel engines are widely used in North America for ships and locomotives. The results of the tests show that the use of EGR, a 4 ° static injection timing delay and a minimum intake manifold temperature result in a reduction in nitrogen oxide (NOx) emissions under the US-EPA (U.S. EPA) mains traction duty cycle compared to the baseline test 40%, while the fuel consumption rate did not increase. The emission rate of particulate matter (PM) is only 7.5% higher than the baseline level. The test results also show that the NOx emission rate is reduced by 50.6% from the baseline level under the US-EPA shunting duty cycle, while fuel consumption is improved by 2.8%. The weighted PM emission rate for the shunting duty cycle only increased by 12.7% over the baseline level.