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Diesel engine performance and emission characteristics of biodiesel produced by the peroxidation process

机译：过氧化过程产生的生物柴油的柴油机性能和排放特性

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Biodiesel is an alternative fuel that is cleaner than petrodiesel. Biodiesel can be used directly as fuel for a diesel engine without having to modify the engine system. It has the major advantages of having high biodegradability, excellent lubricity and no sulfur content. In this study, the biodiesel produced by a transesterification technique was further reacted by using a peroxidation process. Four types of diesel fuel, biodiesel with and without an additional peroxidation process, a commercial biodiesel and ASTM No. 2D diesel were compared for their fuel properties, engine performance and emission characteristics. The experimental results show that the fuel consumption rate, brake thermal efficiency, equivalence ratio, and exhaust gas temperature increased while the bsfc, emission indices of CO_2, CO and NOV decreased with an increase of engine speed. The three biodiesels showed a higher fuel consumption rate, bsfc, and brake thermal efficiency, while at the same time exhibited lower emission indices of CO and CO_2 as well as a lower exhaust gas temperature when compared to ASTM No. 2D diesel. Moreover, the biodiesel produced with the additional peroxidation process was found to have an oxygen content, weight proportion of saturated carbon bonds, fuel consumption rate, and bsfc that were higher than the biodiesel produced without the additional process; while at the same time the brake thermal efficiency, equivalence ratio, and emission indices of CO_2, CO and NO_X were found to be lower. In particular, biodiesel produced with the addition of the peroxidation process had the lowest equivalence ratio and emission indices of CO_2, CO and NO_x. among all of the four test fuels. Therefore, the peroxidation process can be used to effectively improve the fuel properties and reduce emissions when biodiesel is used.
机译：生物柴油是比石油柴油更清洁的替代燃料。生物柴油可以直接用作柴油发动机的燃料，而无需修改发动机系统。它的主要优点是具有高生物降解性，优异的润滑性和无硫含量。在这项研究中，通过酯交换技术生产的生物柴油通过使用过氧化过程进一步反应。比较了四种类型的柴油，具有和不具有附加过氧化过程的生物柴油，商用生物柴油和ASTM No. 2D柴油的燃料特性，发动机性能和排放特性。实验结果表明，随着发动机转速的提高，燃油消耗率，制动热效率，当量比和废气温度升高，而bsfc，CO_2，CO和NOV的排放指数降低。与ASTM No. 2D柴油相比，这三种生物柴油显示出更高的燃料消耗率，bsfc和制动热效率，同时显示出较低的CO和CO_2排放指数以及较低的废气温度。此外，发现通过额外的过氧化工艺生产的生物柴油的氧含量，饱和碳键的重量比，燃料消耗率和bsfc高于未经额外工艺生产的生物柴油。同时发现制动器的热效率，当量比以及CO_2，CO和NO_X的排放指数较低。特别地，通过添加过氧化过程生产的生物柴油具有最低的当量比和CO_2，CO和NO_x的排放指数。在所有四种测试燃料中。因此，当使用生物柴油时，过氧化过程可用于有效改善燃料性能并减少排放。

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