Experimental investigation on combustion characteristics of coals in low oxygen concentration with thermogravimetry

Coal burning in low oxygen concentration is an important process of coal combustion. The combustion characteristics of coals in low oxygen concentration including ignition characteristics, burn-out characteristics and burning rate, are investigated using thermogravimetry. Experimental results show that TG and DTG curves tend towards higher temperature zone while the ignition points are almost constant for all coals burning in lower oxygen concentration. The burn-out temperature increases while the burning rates decrease with decreased oxygen concentration. The kinetic parameters are provided for coal combustion in low oxygen concentration and compensation effect exists between apparent kinetic parameters. The activation energy E and frequency factor k₀ of combustion reaction are well correlated.