Experimental of effect of oxygen concentration to coal low-temperature oxidation kinetics parameters

To study the influence of oxygen concentration to coal low-temperature oxidation,the temperatureprogrammed experiment was designed for mixed coal samples with particle size of 1.25 mm to 7 mm under the oxygen concentration between 5% and 21%,the oxygen concentration of outlet gas was measured by Gas Chromatograph,oxygen consumption rates under different oxygen concentration and temperature were drawn,the apparent activation energy(Ea)and pre-exponential factor(A) were calculated,and the relationship between oxygen concentration and Ea、A、RO2 was analyzed.The results show that RO2 is affected by oxygen concentration,but RO2 tendency following temperature is not changed; Ea is not obviously affected by oxygen concentration,which is with little effect to the difficulty of coal oxidation reaction,however,it is of obviously effect to the reaction rate,and the effect is gradual with the increasing of oxygen concentration.