通过PCCI和可持续的燃烧解决方案与废油生物柴油提高CI发动机性能和排放量,结合了一项比较研究
Medhat Elkelawy1,2, Hagar Alm-Eldin Bastawissi3, E A El Shenawy3
1Mechanical Engineering Department, Faculty of Engineering, Pharos University in Alexandria, Alexandria, Egypt. medhatelkelawy@f-eng.tanta.edu.eg.
Scientific reports
|July 9, 2025
概括
这项研究探讨了柴油发动机中的废油生物柴油混合物. 预混合充电压缩点火 (PCCI) 模式显著减少NOx和烟雾排放,同时提高制动热效率 (BTE).
科学领域:
- 其他替代燃料 替代燃料
- 燃烧工程 燃烧工程
- 环境科学 环境科学
背景情况:
- 石油燃料的限制和污染推动了寻找可持续能源替代品的研究.
- 生物柴油可减少碳化合物 (HC) 和一氧化碳 (CO) 排放,但面临氧化物 (NOx) 和烟雾不透明性的挑战.
- 预混合充电压缩点火 (PCCI) 是一种在燃烧过程中减轻氧化物和烟雾排放的战略.
研究的目的:
- 研究各种废食用油 (WCO) 生物柴油混合物 (B15D85至B60D40) 对发动机燃烧,效率和排放的影响.
- 为了比较传统柴油燃烧 (CDC) 与PCCI模式的性能.
- 确定最佳的WCO生物柴油混合物和燃烧模式,以减少排放和提高效率.
主要方法:
- 在CDC和PCCI条件下在柴油发动机中测试WCO生物柴油混合物 (B15D85,B30D70,B45D55,B60D40).
- 在PCCI模式下,蒸发柴油在分流器中的预混合比率 (PR) 为20%.
- 评价燃烧特性,制动热效率 (BTE),废气温度 (EGT),HC,CO,NOx和烟雾不透明度.
主要成果:
- 在CDC模式下,较高的生物柴油混合物减少了BTE,EGT,HC和CO,但增加了制动特定能耗 (BSEC),NOx和烟雾.
- PCCI模式增强了BTE,并且由于改善混合物均性和较低的燃烧温度,减少了NOx和烟雾不透明度.
- 在PCCI模式下的B60D40混合物在满载时产生了最低的NOx (325 ppm) 和EGT (192 °C).
- 在PCCI模式下B15D85混合物获得了最高的BTE (34.6%),低NOx (288ppm) 和烟雾不透明度.
结论:
- 与CDC相比,PCCI模式显著提高了燃烧效率,并在使用WCO生物柴油混合物时减少了有害排放 (NOx,烟雾).
- 最佳的混合物选择 (例如,B15D85为最高的BTE,B60D40为最低的NOx/EGT) 取决于具体的性能目标.
- 在PCCI模式下,WCO生物柴油提供了一个有前途的可持续替代品,实现与传统柴油相比的BTE,排放量明显降低.
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