ÅBO AKADEMI KEMISK-TEKNISKA FACULTY OF FAKULTETEN CHEMICAL ENGINEERING Processkemiska Process Chemistry forskargruppen Group REPORT 02-4 Oxidation of a Single Char Particle - Extention of the Model and Re- Estimation of Kinetic Rate Constants J. Konttinen, S. Kallio, P. Kilpinen Combustion and Materials Chemistry Biskopsgatan 8 FIN-20500 Åbo, Finland Internet: http://www.abo.fi/instut/pcg/