Department of Mechanical Engineering, Annamalai University, Tamilnadu, India.
Research and Development Center, Saudi Aramco, Saudi Arabia.
Chemosphere. 2022 Dec;308(Pt 1):136049. doi: 10.1016/j.chemosphere.2022.136049. Epub 2022 Aug 14.
This study focuses on effectively utilizing the biodiesel extracted from Azolla (third-generation biofuel), which is regarded as a renewable energy source, for fueling diesel engines. Biodiesel is unique due to its increased viscosity and different fatty acid composition, which proved difficult to attain better engine performance with a mechanical type injection system. This study expands on the previous investigation in modifying the fuel system when using Azolla biodiesel by using a common rail fuel injection system with wider injection flexibility. Considering the lack of more engine optimization studies for Azolla biodiesel, a parametric study is conducted by changing the fuel injection pressure in the range between 300 bar and 900 bar for diesel engine fueled by B20 (20% Azolla +80% diesel) blend. The experimental engine study revealed that the physical properties of the fuel adversely affect the in-cylinder combustion, which leads to poor engine performance and higher emissions at lower injection pressure (300 bar) for B20 when compared to diesel. As the injection pressure increases, the fuel atomization and other spray characteristics are enhanced and thereby improve the combustion. The Brake Thermal Efficiency (BTE) for B20 at 900 bar injection pressure is 3% higher than the diesel fuel at 300 bar injection pressure under full load conditions. The HC, CO, and smoke emission in the engine exhaust for B20 at 900 bar injection pressure was reduced by 13.3%, 28.5%, and 12.3%, respectively, when compared to diesel. Overall, this study recommends the operation of Azolla biodiesel blend in diesel at 900 bar fuel injection pressure to attain improved engine characteristics.
本研究专注于有效利用从满江红（第三代生物燃料）中提取的生物柴油作为燃料来驱动柴油机。生物柴油具有独特的特性，由于其较高的粘度和不同的脂肪酸组成，使用机械喷射系统很难获得更好的发动机性能。本研究扩展了之前关于在使用满江红生物柴油时修改燃料系统的研究，使用具有更宽喷射灵活性的共轨燃料喷射系统。考虑到满江红生物柴油缺乏更多的发动机优化研究，通过改变燃料喷射压力在 300 巴和 900 巴之间的范围，对 B20（20%满江红+80%柴油）混合燃料的柴油机进行了参数研究。实验发动机研究表明，燃料的物理性质会对缸内燃烧产生不利影响，从而导致在较低的喷射压力（300 巴）下，B20 的发动机性能较差，排放较高，与柴油相比。随着喷射压力的增加，燃油的雾化和其他喷雾特性得到改善，从而改善了燃烧。在全负荷条件下，B20 在 900 巴喷射压力下的制动热效率（BTE）比 300 巴喷射压力下的柴油高 3%。与柴油相比，B20 在 900 巴喷射压力下，发动机尾气中的 HC、CO 和烟度排放分别降低了 13.3%、28.5%和 12.3%。总的来说，本研究建议在 900 巴喷射压力下使用满江红生物柴油混合物在柴油机中运行，以获得更好的发动机特性。
