Method and detailed analysis of individual hydrocarbon species from diesel combustion modes and diesel oxidation catalyst
Method and detailed analysis of individual hydrocarbon species from diesel combustion modes and diesel oxidation catalyst
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DOI：
10.1115/1.2900728
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发表时间：
2008-07-01
影响因子：
1.5
通讯作者：
Bohac, Stanislav V.
中科院分区：
文献类型：
--
作者：
Han, Manbae;Assanis, Dennis N.;Bohac, Stanislav V.
采用火焰离子化检测器气相色谱法，研究了柴油机氧化催化剂（DOC）作用前后常规燃烧和低温预混压燃（PCI）燃烧中碳氢化合物（HC）的形态分布。本文扩展了以前报道的工作，详细描述的方法和有效性的未稀释的柴油机排气形态，并提供了一个更详细的分析单个HC物种的常规和PCI柴油燃烧过程。提供的有关未稀释柴油尾气形态分析方法有效性的详细信息包括使用燃料响应因子进行HC物质量化并证明其线性度、检测限、准确度和精密度。单个HC物质的列表不仅提供了设计用于反应堆试验和建模研究的替代排气混合物所需的信息，而且还揭示了PCI燃烧和DOC特性。显著增加的乙炔、苯和甲苯的发动机排出浓度支持了这样的理论，即与PCI燃烧相关的净烟灰减少是由于烟灰形成的减少（与增加的烟灰氧化相反）而发生的。DOC氧化行为根据燃烧特性而不同，这改变了排气种类和温度。
An undiluted exhaust hydrocarbon (HC) speciation method, using flame ionization detector gas chromatographs, is developed to investigate HC species from conventional and low-temperature premixed charge compression ignition (PCI) combustion pre- and postdiesel oxidation catalyst (DOC) exhaust. This paper expands on previously reported work by describing in detail the method and effectiveness of undiluted diesel exhaust speciation and providing a more detailed analysis of individual HC species for conventional and PCI diesel combustion processes. The details provided regarding the effectiveness of the undiluted diesel exhaust speciation method include the use of a fuel response factor for HC species quantification and demonstration of its linearity, detection limit, accuracy, and precision. The listing of individual HC species provides not only the information needed to design surrogate exhaust mixtures used in reactor tests and modeling studies but also sheds light on PCI combustion and DOC characteristics. Significantly increased engine-out concentrations of acetylene, benzene, and toluene support the theory that net soot reduction associated with PCI combustion occurs due to the reduction of soot formation (as opposed to increased soot oxidation). DOC oxidation behavior differs depending on the combustion characteristics, which change exhaust species and temperature.