Manipulating modern diesel engine particulate emission characteristics through butanol fuel blending and fuel injection strategies for efficient diesel oxidation catalysts
Manipulating modern diesel engine particulate emission characteristics through butanol fuel blending and fuel injection strategies for efficient diesel oxidation catalysts
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DOI：
10.1016/j.apenergy.2016.12.102
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发表时间：
2017-03-15
期刊：
影响因子：
11.2
通讯作者：
Lapuerta, M.
中科院分区：
文献类型：
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作者：
Fayad, M. A.;Tsolakis, A.;Lapuerta, M.
事实证明，将减排技术和发动机燃油经济性之间的依赖关系脱钩，以同时提高两者之间的关系，已被证明是汽车研究界面临的一项重大挑战。此外，现代和下一代内燃机排气温度较低，对道路运输环境催化剂的性能提出了挑战。研究燃油性质和燃油喷射策略对燃烧特性、排放形成以及催化剂性能的影响，可以揭示协同效应，从而有利于车辆排放和燃油经济性，并指导下一代可持续燃料的设计。本文介绍的试验工作是在一台装有柴油氧化催化剂(DOC)的现代单缸共轨燃油喷射系统柴油机上进行的。研究了作为后处理系统功能(即柴油机微粒过滤器再生或烃类选择性还原NOx活性)的燃油后喷射策略与丁醇-柴油混合燃料(B20)燃烧相结合对发动机排放、颗粒物特性(粒度分布、形态和结构)和氧化催化剂活性的影响。结果表明，喷油后可降低颗粒物的浓度，并通过减小一次粒子数(n(Po))、旋转半径(R-g)和分维(D-f)来改变碳烟的形态参数。并与柴油机燃用柴油的结果进行了比较。在所研究的排气条件下(即T=300℃)，由于柴油后喷射导致排气中HC和CO浓度的增加，导致DOC活性降低，这是因为物种对活性中心的竞争加剧。与柴油相比，B20的燃烧效果得到了改善。(C)2016爱思唯尔有限公司。保留所有权利。
Decoupling the dependences between emission-reduction technologies and engine fuel economy in order to improve them both simultaneously has been proven a major challenge for the vehicle research communities. Additionally, the lower exhaust gas temperatures associated with the modern and future generation internal combustion engines are challenging the performance of road transport environmental catalysts. Studying how fuel properties and fuel injection strategies affect the combustion characteristics, emissions formation and hence catalysts performance can unveil synergies that can benefit vehicle emissions and fuel economy and as well as guide the design of next generation sustainable fuels. The experimental work presented here was conducted using a modern single-cylinder, common rail fuel injection system diesel engine equipped with a diesel oxidation catalyst (DOC). The impact of the fuel post injection strategy that is commonly used as part of the aftertreatment system function (i.e. regeneration of diesel particulate filters or activity in hydrocarbon selective reduction of NOx), combined with butanol-diesel fuel blend (B20) combustion on engine emissions formation, particulate matter characteristics (size distribution, morphology and structure) and oxidation catalyst activity were studied. It was found that post-injection produced lower PM concentration and modified the soot Morphological parameters by reducing the number of primary particles (n(po)), the radius of gyration (R-g), and the fractal dimension (D-f). The results were compared with the engine operation on diesel fuel. The increased concentration of HC and CO in the exhaust as a result of the diesel fuel post-injection at the studied exhaust conditions (i.e. T = 300 degrees C) led in the reduction of the DOC activity due to the increased competition of species for active sites. This effect was improved the combustion of B20 when compared to diesel. (C) 2016 Elsevier Ltd. All rights reserved.