Impacts of acetone on the spray combustion of Acetone–Butanol–Ethanol (ABE)-Diesel blends under low ambient temperature
Impacts of acetone on the spray combustion of Acetone–Butanol–Ethanol (ABE)-Diesel blends under low ambient temperature
复制标题
DOI：
10.1016/j.fuel.2014.10.009
复制
发表时间：
2015-02
期刊：
影响因子：
7.4
通讯作者：
Han Wu;Karthik Nithyanandan;N. Zhou;Timothy H. Lee;C. Lee;Chunhua Zhang
中科院分区：
文献类型：
--
作者：
Han Wu;Karthik Nithyanandan;N. Zhou;Timothy H. Lee;C. Lee;Chunhua Zhang
丙酮-丁醇-乙醇（ABE）是生产生物丁醇的 ABE 发酵过程中的中间产物，被认为是一种有前途的替代燃料，因为它不仅保留了含氧燃料的优点，与柴油相比烟尘排放量较低，而且还降低了发酵过程中单个组分的燃料回收成本。 ABE-柴油的优点包括较高的氧含量，促进烟灰氧化；更长的点火延迟和火焰升空长度允许喷射流上游有更多的空气夹带，从而提供更好的空气-燃料混合。随着先进ABE发酵技术的发展，可以精确控制生物溶剂中丙酮、丁醇和乙醇的体积百分比。在这方面，需要估计不同 ABE 混合物的性能，以确定最佳混合物并相应地优化生产过程。本文将不同组分体积比（A:B:E 为 6:3:1；3:6:1；0:10:0）的 ABE 燃料与 80% vol 进行混合。柴油并注入定容室。这些混合物的燃烧特性在 LTC 条件（环境温度为 800 K，环境氧含量不同）下进行了实验研究。高速摄像机捕获燃烧过程中的时间分辨宽带光度，并获取火焰升空长度。详细讨论了丙酮和丁醇含量对混合物燃烧特性的影响。 ABE20(6:3:1) 的燃烧特性与纯柴油非常相似，由于丙酮含量较高，因此比其他 ABE-柴油混合物显示出更短的点火延迟。同时，与柴油相比，ABE20(6:3:1) 的自然火焰光度要低得多（碳烟形成更少），因为它的燃烧持续时间更短，预混燃烧更强。
Acetone–Butanol–Ethanol (ABE), an intermediate product in the ABE fermentation process for producing bio-butanol, is considered a promising alternative fuel because it not only preserves the advantages of oxygenated fuels which present lower soot emissions compared to diesel, but also lowers the cost of fuel recovery for individual component during fermentation. The advantageous characteristics of ABE–Diesel include higher oxygen content which promotes soot oxidation; longer ignition delay and flame lift-off length allowing more air entrainment upstream of the spray jet thus providing better air–fuel mixing. With the development of advanced ABE fermentation technology, the volumetric percentage of acetone, butanol and ethanol in the bio-solvents can be precisely controlled. In this respect, it is desirable to estimate the performance of different ABE blends to determine the best blend and optimize the production process accordingly. In this paper, ABE fuels with different component volumetric ratio (A:B:E of 6:3:1; 3:6:1; 0:10:0), were blended with 80% vol. diesel and injected into a constant volume chamber. The combustion characteristics of these blends were experimentally investigated under LTC conditions (ambient temperature of 800 K with varying ambient oxygen content). Time-resolved broadband luminosities from the combustion process were captured by a high speed camera and flame lift-off lengths were also acquired. The impacts of acetone and butanol content on the combustion characteristics of the blends were addressed in detail. ABE20(6:3:1) displayed combustion characteristics very similar to those of pure diesel, displaying a much shorter ignition delay than that of the other ABE–Diesel blends due to a high fraction of acetone. At the same time, ABE20(6:3:1) presented a much lower natural flame luminosity (lower soot formation) compared to diesel, owing to its shorter combustion duration and stronger premixed combustion.