Combustion Improvements by C4/C5 Bio-Alcohol Isomer Blended Fuels Combined with Supercharging and EGR in a Diesel Engine
Combustion Improvements by C4/C5 Bio-Alcohol Isomer Blended Fuels Combined with Supercharging and EGR in a Diesel Engine
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发表时间：
2018-09
影响因子：
9
通讯作者：
Yasufumi Yoshimoto;Enkhjargal Tserenochir;E. Kinoshita;T. Otaka
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文献类型：
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作者：
Yasufumi Yoshimoto;Enkhjargal Tserenochir;E. Kinoshita;T. Otaka
由纤维素生物质等非食品性资源生产的下一代生物醇是很有前途的可再生能源。研究了一台小型单缸直喷式柴油机燃用4种下一代生物酒精异构体和3：7(质量比)的柴油混合燃料的性能、燃烧特性和排放特性。这里测试的生物酒精异构体是正丁醇和异丁醇(C4醇)，以及正戊醇和异戊醇(C5醇)。为了同时减少NOx和烟雾排放，实验采用了增压和废气再循环相结合的方法。升压压力固定在两种情况下，100kPa(自然吸气操作)和120kpa(增压操作)，并配备罗茨鼓风机增压装置。使用冷却的EGR技术，EGR率从0到25%变化。结果表明，无论有无增压，与柴油相比，所有生物醇混合柴油在保持良好发动机性能的同时，改善了所有EGR率下NOx和碳烟排放之间的权衡关系。研究还发现，无论增压压力和废气再循环率如何，所测试的生物酒精异构体混合物的着火延迟期大小顺序为异丁醇>；正丁醇>；异戊醇>；正戊醇。总体而言，除了着火延迟期的变化外，生物乙醇同分异构体混合燃料对发动机性能、燃烧特性和排放的影响都相对较小。关键词-替代燃料，丁醇，柴油机，废气再循环，新一代生物酒精异构体混合燃料，戊醇，增压
Next generation bio-alcohols produced from non-food based sources like cellulosic biomass are promising renewable energy sources. The present study investigates engine performance, combustion characteristics, and emissions of a small single cylinder direct injection diesel engine fueled by four kinds of next generation bio-alcohol isomer and diesel fuel blends with a constant blending ratio of 3:7 (mass). The tested bio-alcohol isomers here are n-butanol and iso-butanol (C4 alcohol), and n-pentanol and iso-pentanol (C5 alcohol). To obtain simultaneous reductions in NOx and smoke emissions, the experiments employed supercharging combined with EGR (Exhaust Gas Recirculation). The boost pressures were fixed at two conditions, 100 kPa (naturally aspirated operation) and 120 kPa (supercharged operation) provided with a roots blower type supercharger. The EGR rates were varied from 0 to 25% using a cooled EGR technique. The results showed that both with and without supercharging, all the bio-alcohol blended diesel fuels improved the trade-off relation between NOx and smoke emissions at all EGR rates while maintaining good engine performance, when compared with diesel fuel operation. It was also found that regardless of boost pressure and EGR rate, the ignition delays of the tested bio-alcohol isomer blends are in the order of iso-butanol > n-butanol > iso-pentanol > n-pentanol. Overall, it was concluded that, except for the changes in the ignition delays the influence of bio-alcohol isomer blends on the engine performance, combustion characteristics, and emissions are relatively small. Keywords—Alternative fuel, Butanol, Diesel engine, EGR, Next generation bio-alcohol isomer blended fuel, Pentanol, Supercharging