Emissions Characteristics and Engine Performance from the Interaction Effect of EGR and Diesel-Ethanol Blends in Diesel Engine

IF 2.4 Q3 ENERGY & FUELS
M. Fayad, A. Abed, S. Omran, Alaa Abdulhady Jaber, Amerah A Radhi, H. Dhahad, M. Chaichan, T. Yusaf
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引用次数: 5

Abstract

Recently, most of the researchers focused on provide lower greenhouse gas emissions that emitted from diesel engines by using renewable fuels to be good alternative to the conventional diesel fuel. Ethanol can be derived from renewable sources such as sugar cane, corn, timber and dates. In the current study, the ethanol fuel used in the tests was derived from the dates. The effects of using exhaust gas recirculation (EGR) diesel-ethanol blend (E10) with on engine performance and emissions characteristics have been studied in diesel engine under various engine loads. This study focused the use of oxygen in the bio-ethanol composition to compensate for the decrease occurred by the addition of EGR, which improves the engine performance and reduces its emissions. In this experiment, the ratios of EGR were 10%, 20% and 30% as well as 10% ratio of ethanol was blended into the diesel fuel blend under fixed engine speed. A traditional (without additional systems to reduce emissions) four cylinders direct injection (DI) diesel engine was used for all tests. The brake specific fuel consumption (BSFC) increased with increasing the EGR ratio by 10%, 20% and 30% by 18.7%, 22.4% and 37.4%, respectively. The thermal efficiency decreased under variable conditions of engine load for different ethanol blends. Furthermore, the emissions of NOX decreased when fuelled B10 into the engine in comparison with diesel under low engine load. Significant reduction in the NOx emissions were found when applied EGR in the tests than to the absence EGR for E10 blend and diesel. The NOx reduction rate was 12.3%, 30.6% and 43.4% when EGR rate was 10%, 20% and 30%, respectively. In addition, the concentrations of HC and CO emissions decreased more by 8.23% and 6.4%, respectively, when using E10 in comparison with the diesel for various engine loads. It is indicated that the oxygen reduction by EGR effect was compensated from ethanol blend combustion. The results showed that the combination use of E10 and EGR leads to significant reduction in engine emissions accompanied with partial reduction in the engine performance. 
柴油机EGR与柴油-乙醇混合物相互作用的排放特性与发动机性能
近年来,研究人员主要致力于利用可再生燃料替代传统柴油,降低柴油发动机的温室气体排放。乙醇可以从甘蔗、玉米、木材和枣等可再生资源中提取。在目前的研究中,试验中使用的乙醇燃料是从枣中提取的。在柴油机上研究了不同负荷下使用废气再循环(EGR)柴油-乙醇混合物(E10)对发动机性能和排放特性的影响。这项研究的重点是在生物乙醇成分中使用氧气来弥补添加EGR所带来的减少,从而提高发动机的性能并减少排放。本实验中,EGR的比例分别为10%、20%和30%,在发动机转速固定的情况下,柴油混合燃料中加入10%比例的乙醇。所有测试都使用了传统的四缸直喷(DI)柴油发动机(没有额外的系统来减少排放)。当EGR比增加10%、20%和30%时,制动比油耗(BSFC)分别增加18.7%、22.4%和37.4%。对于不同的乙醇混合物,在不同的发动机负荷条件下,热效率有所下降。此外,在发动机低负荷下,与柴油相比,将B10燃料注入发动机时,氮氧化物排放量减少。与E10混合燃料和柴油不使用EGR相比,在测试中使用EGR时,氮氧化物排放量显著减少。当EGR率为10%、20%和30%时,NOx减排率分别为12.3%、30.6%和43.4%。此外,在不同的发动机负荷下,与柴油相比,使用E10时HC和CO的排放浓度分别下降了8.23%和6.4%。结果表明,乙醇混合燃烧补偿了EGR效应对氧的还原作用。结果表明,E10与EGR混合使用可显著降低发动机排放,但发动机性能有部分下降。
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来源期刊
CiteScore
4.50
自引率
16.00%
发文量
83
审稿时长
8 weeks
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