Pyrolysis Kinetics of Turkish Bituminous Coals by Thermal Analysis

Authors : İffet YAKAR ELBEYLİ, Sabriye PİŞKİN

Pages : 233-240

View : 10 | Download : 10

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Simultaneous thermogravimetry-differential thermal analysis insert ignore into journalissuearticles values(TG-DTA); was used to study the pyrolysis kinetics of Turkish bituminous coals. Thermogravimetry insert ignore into journalissuearticles values(TG); and derivative thermogravimetry insert ignore into journalissuearticles values(DTG); were employed to measure the weight changes and rates of weight loss, which were used for comparison of the thermal behaviour of several coals and calculation of their kinetic parameters. Coal samples were heated in TG-DTA apparatus in an inert atmosphere insert ignore into journalissuearticles values(100 ml min-1 nitrogen); at a temperature range of 25-1000 °C. The activation energy insert ignore into journalissuearticles values(Ea); and pre-exponential factor insert ignore into journalissuearticles values(A); were calculated from the experimental results by using an Arrhenius-type kinetic model. The data indicate that the pyrolysis of coals is a 1-stage process. The decomposition stage insert ignore into journalissuearticles values(350-700 °C); has a best fit with first-order kinetics with Ea = 65-97 kJ mol-1.
Keywords : Pyrolysis, coal, DTA, TG, kinetic