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Evaluation of char reaction rate in a fluidised bed gasifier: from reactivity determination to reactor simulation

Alberto Gómez Barea ; Bo Leckner (Institutionen för energi och miljö, Energiteknik)
Proceedings of 17th European Biomass Conference, 2009 p. 683–689. (2009)
[Konferensbidrag, refereegranskat]

This work analyses how to use char reactivities determined in the laboratory to predict carbon conversion in large-scale fluidised-bed gasifiers (FBG). It is shown how the char reactivity is determined in the laboratory to obtain kinetic expressions for FBG simulation, i.e. at high temperature and heating rates. A simple model is used to predict the char gasification rate in an FBG. It is shown that in most practical situations the average reactivity of char in the bed differs substantially from the reactivity calculated with the average conversion, leading to inaccuracies in predicting the carbon conversion in an FBG. Therefore, the distribution of conversion has to be addressed for proper prediction. The importance of accounting for the distribution of conversion is demonstrated in an example, where the char conversion in an industrial FBG is predicted.

Nyckelord: gasification; fluidized bed; biomass.


Hamburg



Denna post skapades 2009-11-11. Senast ändrad 2016-08-15.
CPL Pubid: 101547

 

Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik

Ämnesområden

Miljöteknik

Chalmers infrastruktur