Combustion characteristics and kinetics of DPR Korea's anthracite in O2/N2 and O2/CO2 atmosphere

In O-2/N-2 and O-2/CO2 atmospheres with oxygen concentrations of 21%, 30%, and 50%, combustion characteristics index, apparent activation energy, and kinetics models of D.P.R Korea's anthracite (KA) were estimated and compared. At the same oxygen concentration condition, combustion characteristics of KA in O-2/CO2 atmosphere were more clearly reduced than those in O-2/N-2 atmosphere. And the ignition, burnout and comprehensive combustion indexes in 21% O-2/79% N-2 (general air) and 30% O-2/70% CO2 atmosphere were almost identical. As a result of estimating the apparent activation energy, the lowest average of it was recorded in both O-2/N-2 and O-2/CO2 atmosphere at 30% oxygen concentration among three oxygen concentration. Besides, it was found that when KA was burned in an O-2/CO2 atmosphere condition with an oxygen concentration of 30%, the average apparent activation energy was the smallest. Kinetics models under various heating rates were estimated using the Kissinger-Akahira-Sunose (KAS) method. As a result of comparison, the consistency between 21% O-2/79% N-2 (general air) and 30% O-2/70% CO2 was further confirmed in kinetics model.