柴油-甲醇微乳化燃料的制备及燃烧特性研究

The Study on Preparation and Combustion of Diesel-Methanol Micro-Emulsified Fuel

本文根据乳化和微乳化理论选择油酸作为表面活性剂配制了多种配比的柴油 甲醇微乳化燃料。微乳化燃料获得了与柴油相近的发动机动力性和热效率,NOX排放比燃用柴油时高,碳烟排放比燃用柴油时低。随供油提前角的推迟,NOX排放快速下降,碳烟排放变化不大,推迟供油可使甲醇混合油获得更好的排放水平。由于甲醇汽化潜热大、乳化燃料具有微爆效应,故在小负荷时混合燃料滞燃期比柴油时大,而在大负荷时两者较接近。随混合油含醇率的增加,预混燃烧峰值也随之增加。

According to emulsification and micro-emulsification theories, oleic acid is chosen as the surfactant to prepare micro-emulsified fuels. Engine fueled with micro-emulsified fuels gets higher power output and thermal efficiency, higher NO_X emission, lower soot emission than diesel. By delaying fuel injection time lower emissions are obtained. NO_X emission largely decreases and soot keeps the same. Due to the high latent heat of methanol and the micro-explosion effect of emulsified fuel, the ignition delay of the fuels are longer than that of diesel at small load but almost the same at heavy load. When the proportion of methanol in the fuels increases, the peak heat release rate of premixed combustion increases.