Comparison of chemical reaction kinetic models for corn cob pyrolysis. (November 2020)

• Record Type: Journal Article
• Authors: Phuakpunk, Kiattikhoon; Chalermsinsuwan, Benjapon; Assabumrungrat, Suttichai
• Is Part Of: Energy reports. Volume 6(2020)Supplement 6
• Page Start: 168
• Page End: 178
• Publication Date: 2020-11
• Subjects: Corn cob -- Pyrolysis -- Kinetic analysis -- Friedman method -- Ozawa–Flynn–Wall​ method; Power resources -- Periodicals; Energy industries -- Periodicals; Power resources; Periodicals; Electronic journals; 621.04205
• DOI: 10.1016/j.egyr.2020.08.041
• Languages: English
• ISSNs: 2352-4847

Abstract

Abstract: This study used thermogravimetric analysis to investigate activation energy and pre-exponential factor of corn cob pyrolysis via various model-free methods. For applying kinetics of pyrolysis reaction in commercial simulation tools, a representative single reaction of overall pyrolysis reaction would be preferable in provided toolboxes. However, the kinetic parameters for this single reaction should be suitable to cover all the conversion range. Thus, the kinetic parameters were developed as polynomial regression models. The results showed that verification of using the quadratic regression models derived via Friedman method ( E a = − 488 . 68 X 2 + 587 . 78 X + 64 . 104 and ln ( A ) = − 106 . 58 X 2 + 116 . 71 X + 17 . 232 ) had very close agreement with the experiments in entire range of conversion. These regression models could be widely applied in slow pyrolysis and gasification. However, the constants derived via Ozawa–Flynn–Wall​ method ( E a = 248 . 05 kJ mol − 1 and A = 3 .05x10 22 min − 1 ) were simpler for use in some applications which had no effect of pyrolysis at temperature​ below 300 °C or conversion below 50%, like fluidized bed pyrolysis/gasification.