Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Sci Total Environ. 2019 Mar 25;658:1117-1130. doi: 10.1016/j.scitotenv.2018.12.270. Epub 2018 Dec 19.
This experimental study was conducted to explore the favorable and unfavorable conditions which promote or reduce the performance and emissions in a diesel engine, based on six engine loads (5% to 95% load) and five biodiesel contents including B0 (0% waste cooking oil biodiesel and 100% diesel, by volume %), B20, B50, B75 and B100 (pure biodiesel), at a constant engine speed of 1920 rpm. According to the results, the maximum brake specific fuel consumption was recorded at the lowest engine load (5% load) using B100; while the highest brake thermal efficiency was obtained at 80% load for B100. In regard to regulated emissions, the highest engine load (95% load) with diesel fuel was the condition for the formation of maximum CO, smoke opacity, PM mass, total particle number concentration and geometric mean diameter. The 95% load with B100 was the condition for maximum CO and NO. The 60% load with diesel fuel was the condition for maximum THC. For unregulated emissions, low engine load with B100 was the condition for maximum formaldehyde, acetaldehyde, ethene and propene. The maximum 1,3-butadiene was observed for B100 at 80% load. The highest benzene emission was recorded at 40% load for B100. The maximum toluene and xylene emissions were found at 5% load for diesel fuel. In addition, the conditions which lead to produce the minimum emissions are also extensively discussed in the present study.
本实验研究旨在探索在六种发动机负荷（5%至 95%负荷）和五种生物柴油含量（B0[0%废食用油生物柴油和 100%柴油，体积比]、B20、B50、B75 和 B100[纯生物柴油]）下，基于一个恒定的发动机转速（1920rpm），提高或降低柴油机性能和排放的有利和不利条件。结果表明，使用 B100 时，在最低发动机负荷（5%负荷）下记录到最大制动比油耗；而在 80%负荷下，B100 获得了最高的制动热效率。关于规定排放物，在最大发动机负荷（95%负荷）下使用柴油燃料是 CO、烟度、PM 质量、总颗粒数浓度和几何平均直径最大形成的条件。在 95%负荷下使用 B100 是 CO 和 NO 最大的条件。在 60%负荷下使用柴油燃料是 THC 最大的条件。对于非规定排放物，在低发动机负荷下使用 B100 是甲醛、乙醛、乙烯和丙烯最大的条件。在 80%负荷下，B100 观察到最大的 1,3-丁二烯。在 40%负荷下，B100 记录到最大的苯排放。在 5%负荷下，柴油燃料的甲苯和二甲苯排放量最高。此外，本研究还广泛讨论了产生最低排放的条件。
