Droplets Evaporation Characteristics of Diesel from Direct and Indirect Coal Liquefaction and Their Blends

doi:10.16183/j.cnki.jsjtu.2023.195

Abstract

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.

Key words: evaporation rate, droplet lifetime, diesel from direct coal liquefaction, diesel from indirect coal liquefaction

CLC Number:

TK46+4

SHEN Yukun, WANG Jigang, QIAO Xinqi. Droplets Evaporation Characteristics of Diesel from Direct and Indirect Coal Liquefaction and Their Blends[J]. Journal of Shanghai Jiao Tong University, 2024, 58(8): 1148-1155.

Figures/Tables 11

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参数	取值
参数	柴油	DDCL	DICL	混合燃料
密度(20 ℃)/(kg·m^-3)	834	849	767	816
运动黏度(20 ℃)/(mm²·s^-1)	4.4	2.5	3.2	2.8
表面张力(20 ℃)/(mN·m^-1)	27.9	26.7	25.9	26
闪点/℃	68	66	63	66
终馏点(0.1 MPa)/℃	346	268	353	334
热值/(MJ·kg^-1)	42.8	42.8	43.9	43.2
十六烷值	52.4	40.5	75	52.6