Improvement of combustion performance and emissions in diesel engines by fueling n-butanol/diesel/PODE3-4 mixtures
Improvement of combustion performance and emissions in diesel engines by fueling n-butanol/diesel/PODE3-4 mixtures
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DOI：
10.1016/j.apenergy.2017.09.088
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发表时间：
2018-10-01
期刊：
影响因子：
11.2
通讯作者：
Wang, Qingxin
中科院分区：
文献类型：
--
作者：
Huang, Haozhong;Liu, Qingsheng;Wang, Qingxin
聚甲醛二甲醚(PODEn)是一种性能优良的生物燃料，不含碳-碳键，具有很强的碳烟减排潜力。研究了正丁醇/柴油/PODE3-4混合燃料对四缸直喷柴油机燃烧性能和排放特性的影响。探讨了PODE共混物降低碳烟的机理。试验结果表明，在正丁醇/柴油混合燃料中加入PODE3-4，可以提高燃料的热效率和燃烧效率，提高制动比油耗。随着BMEP的增加，碳烟、CO和THC的排放量呈下降趋势，而NOx的生成量则增加。在BMEP为1.2 Mpa时，BD20、BDP10和BDP20的碳烟排放量分别比纯柴油降低了61.5%、80.7%和91.1%。在相同的BMEP值下，在正丁醇/柴油混合燃料中添加PODE(3-4)可以降低碳烟、CO和THC的排放，其中BDP20的碳烟和THC排放最低，其次是BDP10、BD20和D100。投加PODE3-4可以降低颗粒物的数浓度和总颗粒物的质量浓度。化学动力学模拟结果表明，PODEn在热解过程中首先发生C-O键断裂，生成CH2O；随着n值的增加，生成更多的CH2O，并进一步氧化生成HCO，最终转化为CO和CO2，避免了碳烟前体的产生。
Polyoxymethylene dimethyl ethers (PODEn) are an excellent biofuel with no C-C bond and substantial soot-reduction potential. The effects of BMEPs on the characteristics of combustion performance and emissions in a four-cylinder direct injection diesel engine with n-butanol/diesel/PODE3-4 blends were investigated. Mechanism of the PODE blends on soot reduction is discussed. The experimental results indicate that upon adding PODE3-4 to the blend of n-butanol with diesel can improve the thermal efficiency and combustion efficiency with an increment in the brake specific fuel consumption (BSFC). As the BMEP increased, a decreasing trend was observed in the emissions of soot, CO, and THC, while increasing NOx formation. Under a BMEP of 1.2 MPa, the soot emissions from the combustion of BD20, BDP10, and BDP20 reduced by 61.5%, 80.7, and 91.1%, respectively, compared to that from pure diesel. Under equal BMEP value, adding PODE(3-4 )to n-butanol/diesel blend reduced the soot, CO and THC emissions, and the lowest soot and THC emissions were found for BDP20, followed by BDP10, BD20, and D100. The number concentration of the accumulated particulate matter as well as the mass concentration of total particulate matters can be decreased by adding PODE3-4. The chemical kinetics simulation results reveal that C-O bonds break and CH2O is first produced in the pyrolysis of PODEn; as the value of n increases, more CH2O is produced and further oxidized to form HCO, which is finally transformed into CO and CO2, avoiding the production of soot precursors.