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

作　　者：沈钰焜 王继刚 乔信起[2] SHEN Yukun;WANG Jigang;QIAO Xinqi(School of Mechanical Engineering,Yangzhou University,Yangzhou 225127,Jiangsu,China;Key Laboratory of Power Machinery and Engineering of the Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[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

出　　处：《上海交通大学学报》2024年第8期1148-1155,共8页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(52006136);江苏省自然科学基金(BK20220588)资助项目。

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d^(2)定律(d为液滴直径)存在较大偏差,随环境温度的升高,与d^(2)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.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 d^(2)law is large below 600℃,and the deviation from the d^(2)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 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]