Combustion and emissions characteristics of high n-butanol/diesel ratio blend in a heavy-duty diesel engine and EGR impact
Combustion and emissions characteristics of high n-butanol/diesel ratio blend in a heavy-duty diesel engine and EGR impact
复制标题
重型柴油机中高正丁醇/柴油比例混合物的燃烧和排放特性以及 EGR 影响
DOI：
10.1016/j.enconman.2013.11.037
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发表时间：
2014-02-01
影响因子：
10.4
通讯作者：
Lee, Chiafon
中科院分区：
文献类型：
--
作者：
Chen, Zheng;Wu, Zhenkuo;Lee, Chiafon
在这项工作中，通过实验和模拟研究了重型柴油机中含有 40% 丁醇的高正丁醇/柴油比混合物（即 Bu40）在 1400 rpm 的恒定发动机转速和 1.0 MPa 的 IMEP 下的燃烧和排放基础。此外，还通过实验评估了 EGR 的影响，并与纯柴油（即 Bu00）进行了比较。结果表明，Bu40比Bu00具有更高的缸压、更长的点火延迟和更快的燃烧速度。此外，与Bu00相比，Bu40由于更宽的燃烧高温区域而具有较高的NOx，由于局部较低的当量比分布而具有较低的烟尘，并且由于膨胀后期气体温度较低而具有较高的CO。对于 Bu40，EGR 可显着降低 NOx 排放，而对烟尘没有明显影响。同时，在达到 EGR 阈值之前，EGR 的 HC 和 CO 排放以及指示热效率 (ITE) 没有显着变化。当EGR率超过阈值水平时，HC和CO排放急剧增加，ITE显着下降。与Bu00相比，Bu40的阈值出现在较低的EGR率下。因此，将高丁醇/柴油比例的混合物与中等 EGR 相结合，有可能同时实现超低氮氧化物和烟灰排放，同时保持高热效率水平。 (C) 2013 Elsevier Ltd. 保留所有权利。
In this work, the combustion and emission fundamentals of high n-butanol/diesel ratio blend with 40% butanol (i.e., Bu40) in a heavy-duty diesel engine were investigated by experiment and simulation at constant engine speed of 1400 rpm and an IMEP of 1.0 MPa. Additionally, the impact of EGR was evaluated experimentally and compared with neat diesel fuel (i.e., Bu00). The results show that Bu40 has higher cylinder pressure, longer ignition delay, and faster burning rate than Bu00. Compared with Bu00, moreover, Bu40 has higher NOx due to wider combustion high-temperature region, lower soot due to local lower equivalence ratio distribution, and higher CO due to lower gas temperature in the late expansion process. For Bu40, EGR reduces NOx emissions dramatically with no obvious influence on soot. Meanwhile, there is no significant change in HC and CO emissions and indicated thermal efficiency (ITE) with EGR until EGR threshold is reached. When EGR rate exceeds the threshold level, HC and CO emissions increase dramatically, and ITE decreases markedly. Compared with Bu00, the threshold of Bu40 appears at lower EGR rate. Consequently, combining high butanol/diesel ratio blend with medium EGR has the potential to achieve ultra-low NOx and soot emissions simultaneously while maintaining high thermal efficiency level. (C) 2013 Elsevier Ltd. All rights reserved.