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International Journal of Automotive Technology > Volume 22(5); 2021 > Article
International Journal of Automotive Technology 2021;22(5): 1189-1200.
EFFECT OF AGED LUBRICATING OIL ON THE REGENERATION OF DIESEL PARTICULATE FILTERS AND ASH PHYSICAL CHARACTERISTICS WITH NON-THERMAL PLASMA TECHNOLOGY
Nan Zhao, Yixi Cai, Yunxi Shi, Weikai Wang, Sijia Ni
Jiangsu University
PDF Links Corresponding Author.  Yunxi Shi , Email. syxqc@ujs.edu.cn
ABSTRACT
The objective of this study was to evaluate the effects of lubricating oil age on the generation of diesel particulate filters (DPF) by non-thermal plasma (NTP) technology and to characterize the physical properties of ash. The regeneration status was evaluated by the concentration of regeneration products and regeneration temperature. The compositional and morphological characteristics of ash were analyzed by energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Compared with DPF@L-fresh, the internal regeneration temperature was reduced in DPF@L-age. The unit removal time of carbon was 39.23 min/g for DPF@L-fresh but was reduced to 34.87 min/g for DPF@L-age, which indicated that the efficiency of NTP regeneration increased. Shorter regeneration time and lower airflow resistance caused by NTP technology aided the formation of a unique chain-type ash with the structure of a hollow column. Several fine particles that had formed by the condensation of volatiles were distributed on the ash surface of the aged lubricant, and the ash clusters were loosely combined. TEM images revealed that ash was mostly composed of a crystal structure, that the ash dimension of aged lubricant decreased, and that the adhesion between ash particulates was weak.
Key Words: Diesel engine, Diesel particulate filter, Regeneration, Lubricating oil, Non-thermal plasma, Ash
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