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Energy, exergy, and emission analysis of a hydroxyl fueled compression ignition engine under dual fuel mode

机译：双燃料模式下使用羟基燃料的压燃式发动机的能量，火用和排放分析

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摘要

In this study, energy, exergy, and emission analysis were investigated for the hydroxyl fueled compression ignition (CI) engine under dual fuel mode. Hydroxyl gas (HHO) generator was used to supply three different mass flow rates of HHO (0.25, 0.5, and 0.75 lpm) along with diesel for the experimental work on a modified constant speed CI engine. Significant improvement of 6.5% in brake thermal efficiency was obtained with 0.75 lpm HHO flow rate at 80% load. However, a slight increment in heat transfer losses and energy in exhaust gas were observed by 6.29% and 8.55%, respectively, at the optimized condition. The work availability, exhaust gas, and heat transfer exergy were increased by 6.54%, 5.69%, and 6.36% (0.75 lpm and 80% load), respectively due to the higher diffusivity of hydrogen and faster oxidation of fuel species within the cylinder. A significant reduction in emission parameters was obtained in carbon monoxide, unburnt hydrocarbon, and smoke emission as 53%, 62%, and 49%, respectively. High pressure and temperature within the cylinder improve the rate of oxidation of fuel species, which results in decreased HC, CO, and smoke emission. Furthermore, high temperature increases the NOX emission by 35%. Overall it can be concluded the HHO can be used as a prominent alternative fuel with increased exergy and lower emissions.
机译：在这项研究中，对双燃料模式下的羟基燃料压缩点火（CI）发动机进行了能量，火用和排放分析。羟基气体（HHO）发生器用于提供三种不同质量流量的HHO（0.25、0.5和0.75 lpm）以及柴油，以用于改进型恒速CI发动机的实验工作。在80％的负载下使用0.75 lpm HHO流量可获得6.5％的制动热效率显着提高。但是，在最佳条件下，观察到的传热损失和废气中的能量分别略有增加6.29％和8.55％。由于氢气的较高扩散性和气缸内燃料种类的更快氧化，可提供的工作量，废气和传热的能值分别增加了6.54％，5.69％和6.36％（0.75 lpm和80％的负荷）。一氧化碳，未燃烧的碳氢化合物和烟雾排放的排放参数分别显着降低，分别为53％，62％和49％。气缸内的高压和高温提高了燃料物质的氧化速率，从而降低了HC，CO和烟气的排放。此外，高温会使NOX排放增加35％。总的来说，可以得出结论，HHO可以用作主要的代用燃料，具有更高的火用度和更低的排放。

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