Journal
FUEL
Volume 309, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.122226
Keywords
Marine diesel engine; Two-stage turbocharger; High-pressure EGR; Donor-cylinder EGR; Adaptive particle swarm optimization
Categories
Funding
- Marine Low-speed Engine Project-Phase I [K16011]
- WeiChai Power Co., Ltd.
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The research suggests that different EGR patterns have a significant impact on balancing NOx and BSFC. HP-EGR is more sensitive to engine loads, while DC-EGR can achieve higher EGR rates and lower NOx at low and medium loads.
With the increasingly stringent emission legislation for marine diesel engines, a higher exhaust gas recirculation (EGR) rate is used to reduce NOx. However, a high EGR rate deteriorates brake specific fuel consumption (BSFC). Therefore, a suitable EGR pattern is critical to balancing NOx and BSFC. In this study, high-pressure EGR (HP-EGR) and donor-cylinder EGR (DC-EGR) were separately established by GT-Power, and NOx and BSFC comprehensive optimization was conducted by adaptive particle swarm optimization. The effect of the EGR-coupled high-pressure turbine on NOx and BSFC for HP-EGR and the effect of the EGR-coupled throttle valve on the inhomogeneity of different cylinders for DC-EGR were studied. Comparisons of two EGR patterns show that the achievable maximum EGR rate for HP-EGR is more sensitive to engine loads than DC-EGR. DC-EGR can achieve a higher EGR rate and lower NOx at low and medium loads. Under the same NOx, the required EGR rate, lambda, boost pressure and exhaust pressure of DC-EGR are lower. However, the BSFC of DC-EGR is slightly higher at a 25% load. As the turbine flow characteristic of HP-EGR is insufficiently adjusted with loads, DC-EGR is more inclined to achieve comprehensive optimization of NOx and BSFC under full loads.
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