Department of Mechanical Engineering, Jeppiaar Engineering College, Chennai, TN, India.
Department of Automobile Engineering, MIT campus, Anna University, Chennai, TN, India.
Environ Sci Pollut Res Int. 2018 Nov;25(32):32684-32693. doi: 10.1007/s11356-018-3166-9. Epub 2018 Sep 22.
This work is all about utilization of more than two low carbon fuels in a diesel engine with a main objective of reducing harmful emissions. Initially, test engine was tested with a non-petroleum-based fuel namely mahua oil, under different load conditions. In the second phase of the work, test engine was modified into dual fuel mode with slight modification in the intake manifold for the admission of a low carbon high octane primary fuel namely ethanol. The engine was tested by varying the ethanol energy share (EES) from 5% to the point at which engine tends to knock at 100% and 40% of the maximum engine power output. Finally, an attempt was made to induct a zero carbon high octane fuel (i.e., hydrogen) in the intake manifold of the dual fuel engine operated with mahua and ethanol and tested for the behavior. Experimental results claimed that inclusion of ethanol improved the brake thermal efficiency (BTE) only at the higher loads. Optimized EES at 100% load conditions was identified as 15%. It is found that injection of ethanol significantly reduced the harmful emissions like smoke and oxides of nitrogen at the price of increased hydrocarbon and carbon monoxide emissions. It is also inferenced that BTE was improved further with the increases of hydrogen flow rate at peak load. Interestingly all the carbon-based emissions were drastically reduced with the inclusion of hydrogen. However, the oxides of nitrogen emission were found to be increased with increase of hydrogen flow rate.
这项工作主要是研究在柴油机中使用两种以上的低碳燃料，以减少有害排放。最初，试验发动机在不同负荷条件下使用一种非石油基燃料，即麻疯树油进行了测试。在工作的第二阶段，试验发动机通过在进气管中进行轻微修改，改装成双燃料模式，以引入一种低碳高辛烷值的主要燃料，即乙醇。发动机通过改变乙醇能量份额（EES）进行测试，从 5%到发动机趋于爆震的点为 100%，以及发动机最大功率输出的 40%。最后，尝试在以麻疯树油和乙醇运行的双燃料发动机的进气管中引入零碳高辛烷值燃料（即氢气），并对其行为进行测试。实验结果表明，仅在较高负荷下，乙醇的加入才会提高制动热效率（BTE）。在 100%负荷条件下，优化的 EES 被确定为 15%。结果表明，乙醇的喷射显著降低了烟雾和氮氧化物等有害排放物，但以增加碳氢化合物和一氧化碳排放为代价。还推断出，随着峰值负荷氢气流量的增加，BTE 进一步提高。有趣的是，随着氢气的加入，所有的碳基排放都大大减少。然而，随着氢气流量的增加，发现氮氧化物的排放增加。
