Combustion kinetics of mixed coal blending bituminous coal with anthracite

The influence of additive amount of bituminous coal on anthracite combustion is systematically analyzed with thermogravimetric analysis(TGA).The results show that,the combustion process is composed of three stages,which are strongly influenced by the additive amount of bituminous coal and heating rate.The increase of bituminous coal makes DTG curves towards low temperature area.The Si,Ca,Al,Fe,S,P are the essential mineral of experimental coal,while the content of Mg,Zn,K,Na,Cl are lower.All thses mineral exist as oxide,silicate,carbonate,sulfate,chlorid and phosphate and so on.During low temperature combustion,the volatilization of mineral has little influence on combustion ratio of mixed coal.The iso-conversional method involving Flynn-Wall-Ozawa(FWO) methods is used for the kinetic analysis of the main combustion process.The results show that,when the additive amount of bituminous varies from 0 to 100 percent,the value of activation energy,which would sharply reduce if the additive amount of bituminous is under 60 percent,increases from 133.94 kJ/mol to 78.03 kJ/mol.