A new lowcost apparatus used to study the character of coal combustion in place of thermograimetric analyzer was developed based on the CO2 release In order to prove the new idea, CO2 concentration of four coal samples during ignition, combustion and burnout was measured by means of the apparatus developed by the authors The characters of special machanism based on the relation between the temperature and CO2 concentration (tCO2), also the derivative curve DtCO2 were obtained The change of CO2 can indirectly estimate the coal combustion characters
