Thermogravimetry analysis and kinetic characteristics of pulverized coal in O2/CO2 atmosphere
Article
Figures
Metrics
Preview PDF
Reference
Related
Cited by
Materials
Abstract:
This study conducts nonisothermal combustion experiments of three types of pulverized coal by Synthesized Thermogravimetry Analyzer in O2/N2 and O2/CO2 atmospheres. It analyzes the changes of combustion characteristic parameters of pulverized coals in different atmospheres and calculated the kinetic parameters at each condition. The results show that combustion characteristics under O2/CO2 atmosphere are different from those under O2/N2 atmosphere at the same O2 concentration. When N2 is replaced by CO2, both ignition time and burnout time of pulverized coals increase, burnout temperature is higher, and combustion characteristic index declines. DTG curves of coal combustion move to low temperature zones when O2 concentration in O2/CO2 mixture increases. It indicates that both ignition and burnout temperature are lower, burnout time decreases, combustion characteristic index obviously increases, and combustion performance of pulverized coals are improved. Activation energy, frequency factor and reaction order at lowtemperature stage are lower than those at hightemperature stage. Kinetic compensation relationship exists between combustion activation energy and frequency factor in different atmospheres.
