Combustion kinetics and reactivity of char from coconut shells pyrolysis
2008 (English)In: 7th International Symposium of High Temperature Air Combustion and Gasification (HTACG 2008), 2008, , 7 p.Conference paper (Refereed)
Combustion process has been the main thermochemical energy conversion technology known since ages. However, as the research on combustion increases, it becomes undeniable that combustion is a very complex process with a number of different parameters and features that cannot be studied at the same time and therefore, they are still not well known as such. In this study, coconut char, produced through pyrolysis at three different heating rates in a thermogravimetric analyzer, is submitted to a combustion using a binary mixture of O2 and He to study its reactivity and determine the respective combustion kinetics. The reactivity is studied by using the critical temperature approach while kinetic parameters are determined through software that allows the determination of the frequency factor, the activation energy and the reaction mechanism, through both model free and predefined model approaches. The results obtained are compared to the similar data available from the literature for other biomasses. The critical temperature was found to vary from 377 to 388oC. The kinetic triplet was found to be comparable with the same data from other biomasses, presenting values as E1,act=101 to 132 kJ/mol and E2,act=166 to 215 kJ/mol (activation energy); A1=2,57E6 to 2.95E10s-1 and A2=6.8E10 to 2.44E14 s- 1(frequency factor); n1=0.38 to 0.80 and n2=0.95 to 1.55 (reaction order).
Place, publisher, year, edition, pages
2008. , 7 p.
char, combusion, reactivity, kinetics
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-9141OAI: oai:DiVA.org:kth-9141DiVA: diva2:25245
QC 201009142008-09-242008-09-242010-09-14Bibliographically approved