Effects of dilute gas on combustion and emission characteristics of a common-rail diesel engine fueled with isopropanol-butanol-ethanol and diesel blends
Effects of dilute gas on combustion and emission characteristics of a common-rail diesel engine fueled with isopropanol-butanol-ethanol and diesel blends
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DOI：
10.1016/j.enconman.2018.03.073
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发表时间：
2018-06
影响因子：
10.4
通讯作者：
Gang Li;Zhien Liu;Timothy H. Lee;C. Lee;Chunhua Zhang
中科院分区：
文献类型：
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作者：
Gang Li;Zhien Liu;Timothy H. Lee;C. Lee;Chunhua Zhang
异丙醇-丁醇-乙醇(IBE)可以作为发动机的替代燃料，以消除丁醇生产中回收和分离成本高的问题，也可以避免丙酮在丙酮-丁醇-乙醇(ABE)中的腐蚀性和低闪点。在这方面，这项研究的目的是研究单缸共轨柴油机燃用IBE和柴油混合燃料的性能、燃烧和排放。对丁醇和柴油的两种混合燃料IBE15(体积分数为15%的IBE和85%的柴油)和IBE30(体积分数为30%的IBE和70%的柴油)进行了试验。此外，为了实现低NOx排放，本研究还在不同稀释气体比例下进行了实验。试验结果表明，当进气增压逐渐稀释时，所有受试燃料的着火时间和燃烧中心都明显延迟。与纯柴油相比，IBE15的制动热效率(BTE)始终较高。对于IBE30，当稀气流量小于30 L/m in时，BTE低于纯柴油。对于所有受试燃料，NOx排放随稀气的增加而降低，而CO和HC的排放则随稀气的增加而增加。纯柴油和IBE15的碳烟排放随着稀气的增加而急剧增加。然而，稀薄气体的增加并不会导致IBE30的碳烟排放显著增加。也就是说，IBE30与适当的EGR比率相结合，具有同时减少NOx和碳烟排放的潜力。
Isopropanol-butanol-ethanol (IBE) can be used in engines as an alternative fuel to eliminate the high recovery and separation costs in the production of butanol and also to avoid the corrosivity and low flash point of acetone in acetone-butanol-ethanol (ABE). In this respect, this study is aimed to investigate the performance, combustion and emissions of a single-cylinder, common-rail diesel engine fueled with IBE and diesel blends. Two blends of butanol and diesel fuel, denoted as IBE15 (15% IBE and 85% diesel in volume) and IBE30 (30% IBE and 70% diesel in volume) were tested. Additionally, the experiments in this study were conducted at different diluted gas ratios to achieve low NOx emission. The experimental results show that when the intake charger is gradually diluted, the start of combustion and combustion center for all the tested fuels are remarkably delayed. Compared with pure diesel, the brake thermal efficiency (BTE) for IBE15 is always higher. Butt for IBE30, the BTE is lower than that of pure diesel when the flow rate of the dilute gas is less than 30 L/min. For all the tested fuels, NOx emission reduces while CO and HC emissions increase with the increase of dilute gas. Soot emission for pure diesel and IBE15 drastically increases as the dilute gas increases. However, the increase of dilute gas does not cause the soot emission of IBE30 to significant increase. That is to say, IBE30 coupled with a proper EGR ratio has the potential to reduce NOx and soot emissions simultaneously.