Combustion characterization of waste cooking oil and canola oil based biodiesels under simulated engine conditions
Combustion characterization of waste cooking oil and canola oil based biodiesels under simulated engine conditions
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DOI：
10.1016/j.fuel.2018.03.053
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发表时间：
2018-07
期刊：
影响因子：
7.4
通讯作者：
C. Ming;I. M. Rizwanul Fattah;Q. Chan;P. Pham;P. Medwell;S. Kook;G. Yeoh;E. Hawkes;A. Masri
中科院分区：
文献类型：
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作者：
C. Ming;I. M. Rizwanul Fattah;Q. Chan;P. Pham;P. Medwell;S. Kook;G. Yeoh;E. Hawkes;A. Masri
替代燃料将来自各种原料和精炼过程。了解这些燃料的燃烧和污染物形成过程的基本原理将有助于它们在不同燃烧系统中的实施。在这项工作中，光学诊断进行废食用油（WCO）和菜籽油（CAO）为基础的生物柴油喷雾，以评估其燃烧和碳烟形成过程。常规柴油被用作与生物柴油进行比较的参考燃料。实验是在一个光学可访问的恒定容积燃烧室（CVCC）与模拟压燃发动机的条件下，不同程度的废气再循环。液体长度和提离长度的结果表明，燃料的液相和它们的燃烧区域之间没有明显的相互作用。火焰离地长度被发现是由燃料的化学和物理性质的影响。据观察，一个较大的差异之间的剥离长度和第一光度的距离与下游烟尘形成较少，虽然燃料的分子结构被发现影响的过程。通过评估不同环境O2气氛下生物柴油和柴油火焰的烟灰和燃烧特性，发现生物柴油和柴油火焰的估计烟灰含量在15和21 vol. %时达到峰值O2浓度。WCO和CAO生物柴油火焰的峰值烟尘含量被发现是可比的，但低于柴油，在各种O2环境。结果还表明，生物柴油具有更高的归一化峰值压力值比柴油在所有O2条件。双色高温测量数据表明，在15和21体积%时，测量的火焰烟粒温度和烟粒KL因子相似O2，但随着环境O2浓度的进一步降低而变化。燃烧持续时间和火焰面积的变化被发现是燃料依赖。
Alternative fuels will come from a variety of feed stocks and refinement processes. Understanding the fundamentals of combustion and pollutants formation processes of these fuels will be useful for their implementation in different combustion systems. In this work, optical diagnostics were performed to waste cooking oil (WCO) and canola oil (CAO) based biodiesel sprays to assess their combustion and soot formation processes. Conventional diesel was used as a reference fuel for comparison with the biodiesels. The experiments were conducted in an optically-accessible constant-volume combustion chamber (CVCC) with simulated compression-ignition engine conditions, with different degree of exhaust gas recirculation. The liquid length and lift-off length results indicate that there was no significant interaction between the liquid phases of the fuels and their combustion regions. The flame lift-off lengths were found to be affected by both the chemical and physical properties of the fuels. It was observed that a larger difference between the lift-off length and the first-luminosity distance was correlated with lesser downstream soot formation, although the molecular structure of the fuel was found to affect the process too. Assessing the sooting and combustion characteristics of the biodiesel and diesel flames across the varied ambient O2atmospheres revealed that the estimated soot contents of the biodiesel and diesel flames peaked at 15 and 21 vol.% O2concentration, respectively. The peak soot contents of the WCO and CAO biodiesel flames were found be comparable, but lower than that of diesel, across the various O2environment. The results also demonstrated that the biodiesels have higher normalized peak pressure values than diesel at all O2conditions. Two-color pyrometry data demonstrated that the measured soot temperature and soot KL factors of the flames were similar at 15 and 21 vol.% O2, but varied with further reduction of ambient O2concentration. Variations in the combustion duration and flame area were found to be fuel dependent.