Journal
THERMOCHIMICA ACTA
Volume 682, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.tca.2019.178417
Keywords
Diffusion; Effects; Kinetics; Oxy-combustion; Char; Combustion
Funding
- National Centre for Research and Development [PS/E/2/66420/10]
- People Programme (Marie Curie Actions) of the European Union [PIRSES-GA-2013-612699, CO2TRIP]
- Polish Ministry of Higher Education and Science [3111/7]
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A kinetic study of oxy-combustion of chars received from two Polish coals, namely lignite and hard sub-bituminous was conducted. The kinetics of char oxy-combustion was examined in the TA Instruments TG-HP150 s pressurized thermogravimetric analyzer at 0.1, 0.5 and 1 MPa of absolute pressure. The experiments were carried out at isothermal conditions and at wide range of temperature (773-1273 K). Mixture of gas containing 20% and 30% of O-2 in CO2 was used as an oxidant. Additionally at temperature 873 K the experiments were performed using 5%, 10% and 40% of O-2 in CO2. A kinetic model of pressurized oxy-combustion of coal char was presented. Kinetic parameters such as activation energy, pre-exponential factor and reaction order in respect of oxygen concentration were computed. Influence of temperature, pressure and O-2 concentration were discussed. The results show a significant shift of the oxycombustion reaction from kinetically controlled regime to diffusion - controlled regime with increasing temperature and pressure. The method of selecting the proper reaction model was presented based on the integral and differential approach of experimental data analysis.
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