The effect of carbon conversion on attrition of lignite char particles during fluidized bed gasification by CO2 was studied in a lab-scale apparatus. Mechanical resistance of the char particles was characterized at different stages of char conversion by specific attrition experiments. Char porosimetric features were also investigated and related to the attrition propensity. Attrition of char particles was significant and increased with conversion, suggesting a gasification-assisted attrition enhancement effect. This mechanism, associated to the low reactivity of the generated fines, made the loss of carbon by fines elutriation during char gasification more extensive than that typically found under combustion conditions.
Fluidized bed gasification of lignite char: the influence of carbon conversion on attrition.
P Ammendola;F Scala
2012
Abstract
The effect of carbon conversion on attrition of lignite char particles during fluidized bed gasification by CO2 was studied in a lab-scale apparatus. Mechanical resistance of the char particles was characterized at different stages of char conversion by specific attrition experiments. Char porosimetric features were also investigated and related to the attrition propensity. Attrition of char particles was significant and increased with conversion, suggesting a gasification-assisted attrition enhancement effect. This mechanism, associated to the low reactivity of the generated fines, made the loss of carbon by fines elutriation during char gasification more extensive than that typically found under combustion conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
