By using Freeman-Carroll method (differential method)and Coats-Redfern method(integral method)in the individually scanning rate method

the activation energy in combustion reaction of blind coal in two kinds has been studied.Results show that the heating rate has greater effect on the E value of activation energy

the E value decreases along with the heating rate's increasing.In the event of lower heating rate

the Freeman-Carroll method uses data on DTG curve

while Coats-Redfern method only uses data on TG curve.From view point of relative coefficient R in data fitting

the error factor in test(i.e.the non-smooth part on DTG curve)has more greater effect on the activation energy calculated by Freeman-Carroll method;in case of higher heating rate

the measured DTG curve tends to be smooth

the influence of error factor R in test upon the calculated result by using Freeman-Carroll method decreases.In addition

along with increasing the heating rate

(2RT)/E tends to be increased

so the hypothesis of (2RT)/E1 in Coats-Redfern method isn't fully rational.