Gasification of wood-char particles with CO2 and H2O : study on the mutual influences of the gases and their effects on the char reactive properties

Abstract : The effect of CO 2 on the char gasification rate was investigated in the case of char particles. The conclusions on its effects on the char reactivity differ from a study to another [1] [2]. The aim of the study was to find more about the effects of CO 2 as a gasifying media when introduced together with steam into a gasifier. The results show that the char reactivity at 900°C in mixed atmospheres of 20% H 2 O + 20% CO 2 in nitrogen can be expressed as the sum of the single reactivities. Gas alternation gasification experiments (in which reactive atmosphere is switched at a certain conversion level from a gas to a second one) done with CO 2 \ H 2 O showed no influence of a first gasification atmosphere on the char reactivity under the second one. Char reactivity always fits to the value under pure atmosphere at the same conversion level and it seems to be only " conversion dependent ". This observation was valid in both directions, so that alternating the gasification medium during the gasification from CO 2 to H 2 O and vice-versa, once or several times along the conversion, showed that the char reactivity to a specific gas at a certain conversion level was the same as if the gasification reaction was operated from the beginning with the same atmosphere composition. We analyzed this lack of influence of previous gasification conditions on the char reactivity through characterisation of the chars throughout the conversion as well as by means of transport limitation analysis based on the Thiele modulus.
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Chamseddine Guizani, Francisco Javier Escudero Sanz, Sylvain Salvador. Gasification of wood-char particles with CO2 and H2O : study on the mutual influences of the gases and their effects on the char reactive properties. 5th International Conference on Engineering for Waste and Biomass Valorisation (WasteEng 2014), Aug 2014, Rio de Janeiro, Brazil. pp.587-599. ⟨hal-01737093⟩

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