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Kinetic study of the effect of in-situ mineral solids on pyrolysis process of oil sludge
被引:108
作者:
Qu, Yi
[1
]
Li, Aimin
[1
]
Wang, Dong
[1
]
Zhang, Lei
[1
]
Ji, Guozhao
[1
]
机构:
[1] Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn, Minist Educ, Linggong Rd 2, Dalian 116023, Peoples R China
关键词:
Oil sludge;
Solids;
Solid-free;
Pyrolysis;
Mechanism;
Kinetic;
THERMAL-ANALYSIS;
THERMOGRAVIMETRIC ANALYSIS;
WASTE-WATER;
TG-FTIR;
COMBUSTION;
TEMPERATURE;
MICROALGAE;
DEMULSIFICATION;
BEHAVIOR;
LIGNITE;
D O I:
10.1016/j.cej.2019.05.183
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
Oil sludge (OS) is composed of water, oil and inert solids (silica, clay minerals, etc.). Although solids were ubiquitous in oil sludge, its potential effects on altering pyrolysis characteristics had rarely been studied. Therefore, the role that solids played during the pyrolysis process of oil sludge was investigated by thermogravimetric analysis (TGA) in this study. The kinetic triplets of both OS (contained solids) and extracted oil (EO, solid-free) from OS during the pyrolysis processes were determined by a combined method, including the integral master-plots method and iso-conversional method. The activation energy values for OS pyrolysis varied between 28 and 10(7) kJ mol(-1), and pre-exponential factor ranged from 10 to 10(4) s(-1). Whereas, the activation energy values for EO pyrolysis ranged from 67 to 193 kJ mol(-1), and its pre-exponential factor varied from 10(6) to 10(10) s(-1). These results suggested that inert solids had positive influences on the pyrolysis of OS because the activation energy for OS pyrolysis was obviously lower than that for EO pyrolysis. The comparison of kinetic models between OS and EO illustrated that solids not only provided sufficient surface for the devolatilization of hydrocarbon but also acted as nucleating agent in char formation.
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页码:338 / 346
页数:9
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