A laminar flame study on di-n-butyl ether as a potential biofuel candidate
A laminar flame study on di-n-butyl ether as a potential biofuel candidate
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DOI：
10.1016/j.combustflame.2017.11.006
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发表时间：
2018-04-01
影响因子：
4.4
通讯作者：
Kohse-Hoeinghaus, Katharina
中科院分区：
文献类型：
--
作者：
Wullenkord, Julia;Tran, Luc-Sy;Kohse-Hoeinghaus, Katharina
二正丁基醚（DBE，C8 H18 O）的燃烧化学，可以想象作为一个潜在的生物燃料的候选人，在这里进行了研究，第一次在火焰条件下检查详细的物种数据集。两种火焰，即，在相同的压力（4 kPa）、氩气稀释（50%）和冷气速度（60 cm s（-1））下，通过使用电子电离（EI）的分子束质谱（MBMS）分析富燃料（phi = 1.5）和贫燃料（phi = 0.8）的样品。约50种物质，包括反应物，稀释剂，燃烧相关的中间体，和产品，被检测到的燃料特定的中间体，有害物种以及重要的烟尘前体的特殊利益。检测到高浓度的正丁醛并将其鉴定为DBE火焰中重要的燃料特异性中间体，而环状烟灰前体（例如，1，3-环戊二烯、苯、甲苯）以低摩尔分数（类似于10 ppm）检测到。本实验数据与Cai等人[Combust. Flame 161（2014）]和Thion等人[Combust. Flame 185（2017）]，具有双重目的，以支持数据解释并检查这些模型的性能，同时相互比较。为了进一步了解DBE的燃烧化学，还将其富燃火焰与较小的醚类（即二甲醚（DME）和二乙醚（DEE））的富燃火焰进行了比较。这种比较显示了醚的脂肪族侧链对中间物质形成的强烈影响。不出意料的是，增加侧链的长度增强了较大不饱和烃的形成趋势。然而，高毒性的羰基化合物，即甲醛和乙醛的贡献，被发现是低得多，使用DBE作为燃料比二甲醚和DEE，分别。同样，DBE也与其半结构相似的燃料进行了比较，即，正丁烷和正丁醇。这种比较一般表明，DBE火焰中的烃类（C4 H8除外）的分布是非常相似的那些在正丁烷和正丁醇火焰，而含氧物种的形成是非常不同的三种燃料。(C)2017燃烧研究所爱思唯尔公司出版All rights reserved.
The combustion chemistry of di-n-butyl ether (DBE, C8H18O), conceivable as a potential biofuel candidate, was studied here for the first time under flame conditions with examining a detailed species dataset. Two flames, i.e., a fuel-rich (phi = 1.5) and a fuel-lean (phi = 0.8) one, were analyzed at the same pressure (4 kPa), argon dilution (50%), and cold-gas velocity (60 cm s(-1)) by molecular-beam mass spectrometry (MBMS) using electron ionization (El). About 50 species including reactants, diluent, combustion-related intermediates, and products, were detected with a special interest in fuel-specific intermediates, harmful species as well as important soot precursors. n-Butanal was detected in high concentration and identified as an important fuel-specific intermediate in the DBE flames, while cyclic soot precursors (e.g., 1,3-cyclopentadiene, benzene, toluene) were detected with low mole fractions (similar to 10 ppm). The present experimental data were compared to simulations by the kinetic model of Cai et al. [Combust. Flame 161 (2014)] and the very recent model of Thion et al. [Combust. Flame 185 (2017)], with the dual purpose to support the data interpretation and to examine the performance of these models also in comparison to each other. Note that species in the range of C-5 to C-7 (known as important soot precursors) that are not yet addressed in either of the models have been well detected and are presented in the present work.For further insight into the combustion chemistry of DBE, its fuel-rich flame was also compared to those of successively smaller ethers, namely dimethyl ether (DME) and diethyl ether (DEE). This comparison showed a strong effect of the aliphatic side chains of ethers on the formation of intermediate species. Not unexpectedly, increasing the length of side chains enhances the formation tendency of larger unsaturated hydrocarbons. However, the contribution of highly toxic carbonyl compounds, namely formaldehyde and acetaldehyde, was found to be much lower upon the use of DBE as a fuel than for DME and DEE, respectively. Similarly, DBE was also compared to its half-structurally similar fuels, i.e., n-butane and n-butanol. This comparison generally indicates that the distribution of hydrocarbon species (except for C4H8) in DBE flames is quite similar to those in n-butane and n-butanol flames, whereas the formation of oxygenated species is very different for the three fuels. (C) 2017 The Combustion Institute. Published by Elsevier Inc. All rights reserved.