| 李长锟，王天友，孙凯，王怀印.进气加湿结合废气再循环技术对高压直喷双燃料低速机燃烧及排放的影响[J].内燃机工程,2021,42(1):1-6. |
| Effects of Intake Humidification Combined with Exhaust Gas Recirculation on Combustion and Emissions of a High Pressure Direct Injection Dual Fuel Low Speed Marine Engine |
| DOI：10.13949/j.cnki.nrjgc.2021.01.001 |
| Key Words:dual fuel marine engine intake humidification exhaust gas recirculation high pressure direct injection（HPDI） combustion emission |
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| Abstract:Based on CONVERGE, a three dimensional simulation model of high pressure direct injection (HPDI) dual fuel marine engine was established. The effects of humid air motor (HAM) and exhaust gas recirculation (EGR) on engine combustion process and emissions were studied. With key technologies of intake humidification, EGR and natural gas injection strategy, a viable technical route was finally achieved to meet the Tier Ⅲ emission regulations. The results show that the intake humidification has great potential in reducing NOx (by about 55%) and it has a little impact on fuel economy (by about 1.6%). It is difficult to meet the Tier Ⅲ emission regulations by using the intake humidification technology alone. The combination of 60% intake humidification and a lower EGR rate (20%) can further reduce NOx emissions (by 78%). In order to reduce the power loss caused by the intake humidification and EGR when taking the measure of 20% EGR rate coupled with 60% intake humidification, the natural gas injection timing is advanced by 2° in crank angle, which can reduce the natural gas consumption by nearly 1g/(kW·h) while NOx emissions meet the Tier Ⅲ emission regulations. |
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