Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6684656 | Applied Energy | 2016 | 12 Pages |
Abstract
This work combines experimental and computational fluid dynamics (CFD) results to derive global kinetics for biomass (pine wood) devolatilization during heating rates on the order of 105Ks-1, bulk flow peak temperatures between 1405 and 1667K, and particle residence times below 0.1s. Experiments were conducted on a laboratory laminar entrained flow reactor (LFR) using solid fuel feed rates on the order of 10-20Â mgh-1. Employing a simple single step first order (SFOR) mechanism with an Arrhenius type rate expression, the best fit of the pyrolysis kinetics was found to be: A=18.9Ã103s-1,Ea=21305Jmol-1. The accuracy of the derived global kinetics was supported by comparing predictions to experimental results from a 15kW furnace. The work emphasizes the importance of characterizing the temperature history of the biomass particles when deriving pyrolysis kinetics. The present results indicate faster kinetics than found in the literature, leading to predicted residence times required for full conversion one order of magnitude lower than when compared to thermogravimetric analysis (TGA) derived kinetics.
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Authors
Joakim M. Johansen, Rasmus Gadsbøll, Jesper Thomsen, Peter A. Jensen, Peter Glarborg, Paul Ek, Nikolai De Martini, Marco Mancini, Roman Weber, Reginald E. Mitchell,