Thermochemical and trace element behavior of coal gangue, agricultural biomass and their blends during co-combustion

•The thermal characterization of coal gangue and biomass were studied.•The kinetic profiles and optimum conditions of the blends were evaluated.•The partition behavior of trace element was analyzed. The thermal decomposition behavior of coal gangue, peanut shell, wheat straw and their blends during...

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Bibliographic Details
Published in:Bioresource technology 2014-08, Vol.166, p.243-251
Main Authors: Zhou, Chuncai, Liu, Guijian, Cheng, Siwei, Fang, Ting, Lam, Paul Kwan Sing
Format: Article
Language:English
Subjects:
Agricultural biomass
Arachis - chemistry
Biological and medical sciences
Biomass
Biomass burning
Blends
Co-combustion
Coal
Coal - analysis
Coal gangue
Combustion
Fundamental and applied biological sciences. Psychology
Gangue
Hot Temperature
Kinetics
Metals, Heavy - chemistry
Oxidation-Reduction
Polymer blends
Reactivity
Renewable Energy
Shells
Thermogravimetry
Trace element
Triticum - chemistry
Waste Products - analysis
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Summary:•The thermal characterization of coal gangue and biomass were studied.•The kinetic profiles and optimum conditions of the blends were evaluated.•The partition behavior of trace element was analyzed. The thermal decomposition behavior of coal gangue, peanut shell, wheat straw and their blends during combustion were determined via thermogravimetric analysis. The coal gangue/agricultural biomass blends were prepared in four weight ratios and oxidized under dynamic conditions from room temperature to 1000°C by various heating rates. Kinetic models were carried out to evaluate the thermal reactivity. The overall mass balance was performed to assess the partition behavior of coal gangue, peanut shell and their blends during combustion in a fixed bed reactor. The decomposition processes of agricultural biomass included evaporation, release of volatile matter and combustion as well as char oxidation. The thermal reactivity of coal gangue could be improved through the addition of agricultural biomass in suitable proportion and subsequent appropriate heating rate during combustion. In combination with the heating value and base/acid ratio limitations, a blending ratio of 30% agricultural biomass is conservatively selected as optimum blending.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2014.05.076