Gasification kinetics of char from olive tree pruning with CO2 and stema in fluidized bed

Abstract

Kinetics of gasification of char from olive tree pruning was measured in a fluidized bed at temperatures between 760 and 900 ºC. Experiments were carried out using H2O­N2 and CO2­N2 mixtures to measure the rates of the gasification reactions with H2O and CO2 and to assess the inhibition effects of H2 and CO. The reaction rates with H2O were 3­4 times faster than those obtained with CO2 and inhibition by CO and H2 was observed to be significant, especially at low temperature. Langmuir­Hinshelwood kinetics was obtained for the two gasification reactions. Additional experiments were carried out with CO2­H2O­N2 mixture to study the simultaneous gasification with CO2 and H2O. It was found that the char was converted slightly faster in a gas mixture containing both CO2 and H2O than in a gas with the same H2O concentration but substituting CO2 by N2.