分会场

高效清洁燃烧

摘要

Compared with other internal combustion engines (ICEs) such as gasoline engines, diesel engines have many advantages such as high thermal efficiency, good durability, low fuel consumption, high reliability, large torque, and long service life. Therefore, diesel engines are widely used in in various large industries, including trucks, buses, ships, military industries, etc. However, the high nitrogen oxides (NOx) and smoke emissions of diesel engines have always been obstacles to their further development. Especially under idle conditions, the low temperature, low pressure, and weak flow intensity in the cylinder result in incomplete combustion of the mixture and the generation of a large amount of harmful emissions. Moreover, with the restriction of the more strict emission regulation of ICEs, there is an urgent need to develop clean combustion technologies for diesel engines. In this study, bioethanol as a fuel additive has been investigated for its impact on diesel engine combustion, emissions, and particle size distribution under idle conditions. The experimental results show that an increase in the volume mixing ratio of bioethanol from 5% to 15% has no significant effect on the maximum pressure in the cylinder, but it increases the maximum heat release rate (HRR), delays ignition delay (ID), increases brake specific fuel consumption (BSFC), and increases carbon monoxide (CO) and hydrocarbon (HC). It is worth noting that the addition of bioethanol reduces both NOx and smoke emissions simultaneously, and improves the trade-off relationship between them. In addition, according to the measurement results of ImagJ software, the diameter of smoke particles emitted by diesel engine fueled with diesel-biodiesel-bioethanol blends is distributed within a narrow range of 18-25 nm. And the addition of bioethanol further reduces the diameter of smoke particles. The smaller the particle diameter, the larger its specific surface area, resulting in more contact sites between it and the adsorbent, which is beneficial for later capture. The high oxygen content and high evaporation latent heat of bioethanol play an important role in the combustion and emission characteristics of diesel engines under idle conditions. In summary, bioethanol, as a clean, renewable, and low-carbon fuel, has great potential in promoting clean combustion in diesel engines.

关键词

生物乙醇;柴油机;空转;燃烧和排放;颗粒直径分布

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