Comprehensive thermochemical
treatment (pyrolysis and combustion)
is considered to be an efficient method for treatment of oil sludge
(OS) or utilization as a heat source. However, combustion of oil sludge
char (OSC), the byproduct from OS pyrolysis, is difficult and energy-consuming
due to the high ash content and low heating value. In this study,
co-combustion of OSC with biomass is proposed, aiming at the efficient
thermal treatment with heat recovery. The thermal characteristics,
kinetics, and interactive mechanisms of co-combustion of OSC with
raw wood (RW) or hydrothermally treated wood (HW) employing thermogravimetric
analysis were investigated. The obtained results indicated that RW
blending with OSC resulted in negative interactions with decreasing
the apparent activation energies (E) of RW, attributed
to the inhibited diffusion of volatiles. The developed porous structure
in HW effectively promoted volatile matter diffusion. Coupled with
the catalytic support by metal oxides in OSC, HW blending yielded
positive interactions during co-combustion despite the increased E. The results showed that diffusion models were the most
efficient mechanism for OSC/RW combustion. However, chemical reactions
were found to be the rate-determining steps for OSC/HW combustion.
The catalytic effect of inorganic elements and their physical influence
on heat and mass transfer can control the co-combustion performance
of OSC and biomass. The findings could offer reference information
for understanding OSC co-combustion and provide a basis for implementing
and optimizing the co-combustion between biomass and ash-rich waste.
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