煤直接、间接液化柴油及其混合燃料液滴的蒸发特性
Droplets Evaporation Characteristics of Diesel from Direct and Indirect Coal Liquefaction and Their Blends
沈钰焜 1王继刚 1乔信起2
作者信息
- 1. 扬州大学机械工程学院,江苏扬州 225127
- 2. 上海交通大学动力机械与工程教育部重点实验室,上海 200240
- 折叠
摘要
为研究煤直接和间接液化柴油(DDCL、DICL)及其混合燃料液滴在不同环境温度下(500、600和700 ℃)的蒸发特性,利用基于悬挂法的液滴蒸发试验装置,采用交叉石英丝悬挂液滴,通过燃料设计方法,将DDCL和DICL按29∶21的质量比混合后可获得与柴油理化特性非常相近的燃料.研究显示,DDCL、DICL及其混合燃料液滴蒸发规律与柴油相似,均呈现两阶段蒸发.在600 ℃以下与经典d2定律(d为液滴直径)存在较大偏差,随环境温度的升高,与d2定律的偏差逐渐缩小.在以上3种环境温度下,混合燃料液滴均表现出的蒸发性能优于柴油,分别比柴油的平均蒸发速率高27.2％、46.3％和19.6％.研究结果为煤液化柴油在柴油机上的应用提供支撑数据.
Abstract
To study the evaporation characteristics of diesel from direct coal liquefaction(DDCL),diesel from indirect coal liquefaction(DICL),and their blended fuel droplets at different ambient temperatures(500,600 and 700 ℃),a droplet evaporation test apparatus based on the suspension method was used to suspend droplets using crossed quartz wires,and a fuel with very similar physicochemical properties to diesel was obtained by blending of DDCL and DICL at a mass ratio of 29∶21 by using the fuel design method.It is shown that the evaporation pattern of DDCL,DICL,and their blended fuel droplets is similar to that of diesel fuel,and they all show a two-stage evaporation.The deviation from the classical d2 law is large below 600 ℃,and the deviation from the d2 law gradually decreases with the increase of ambient temperature.At all three ambient temperatures,the blended fuel droplets exhibit a better evaporation performance than diesel,with 27.2％,46.3％,and 19.6％higher average evaporation rates than diesel,respectively,providing supporting data for the application of coal liquefied diesel in diesel engines.
关键词
蒸发速率/液滴寿命/煤直接液化柴油/煤间接液化柴油Key words
evaporation rate/droplet lifetime/diesel from direct coal liquefaction/diesel from indirect coal liquefaction引用本文复制引用
基金项目
国家自然科学基金(52006136)
江苏省自然科学基金(BK20220588)
出版年
2024
NETL
NSTL
万方数据