Pyrolysis, combustion, and gasification properties of pulverized coal and char in CO2-rich gas flow were investigated by using\r\ngravimetric-differential thermal analysis (TG-DTA) with changing O2%, heating temperature gradient, and flow rate of CO2-rich\r\ngases provided. Together with TG-DTA, flue gas generated from the heated coal, such as CO, CO2, and hydrocarbons (HCs), was\r\nanalyzed simultaneously on the heating process.The optimum O2% inCO2-rich gas for combustion and gasification of coal or char\r\nwas discussed by analyzing flue gas with changing O2 from 0 to 5%. The experimental results indicate that O2% has an especially\r\nlarge effect on carbon oxidation at temperature less than 1100�°C, and lower O2 concentration promotes gasification reaction by\r\nproducing CO gas over 1100�°C in temperature.The TG-DTA results with gas analyses have presented basic reference data that show\r\nthe effects of O2 concentration and heating rate on coal physical and chemical behaviors for the expected technologies on coal\r\ngasification in CO2-rich gas and oxygen combustion and underground coal gasification.
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