Combustion characteristics of coal gangue and biomass under an O2/CO2 atmosphere
2020
Oxygen concentration and biomass content are key factors of the combustion of
a mixed sample of biomass and coal gangue. Herein, we studied the effect of
oxygen concentration and biomass content and their corresponding combustion
and kinetic characteristics. Experiments were conducted in a
thermogravimetric analyzer under an O2/CO2 atmosphere. Results showed that
the fixed carbon combustion temperature, ignition temperature, and
exothermic peak temperature decreased with oxygen concentration increased.
By contrast, the burning rate of volatilization increased with oxygen
concentration increased. The total and maximum loss rates of the sample, the
burnout temperature, the exothermic peak temperature, and the comprehensive
combustion index S gradually increased. As oxygen concentration increased,
the activation energy at the initial stage of combustion gradually
decreased, whereas the activation energy at the end of the reaction
gradually increased when the oxygen concentration increased. Activation
energy could be rapidly reduced after a small amount of biomass was added,
whereas the biomass content had no significant influence on the activation
energy of the samples at the end of combustion.
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