Henrik Thunman

TL;DR: In this paper, an empirical model for the stoichiometry of biomass pyrolysis is presented, where empirical parameters are introduced to close the conservation equations describing the process, and the prediction capability of the model is briefly addressed, with the results showing that the yields of volatiles released from a specific biomass are predicted with a reasonable accuracy.

TL;DR: In this article, a simplified model is presented whose structure is valid for any solid fuel, consisting of a heat and mass balance complemented by empirical data, and the empirical coefficients have to be specified for certain classes of fuel, having particle sizes in the range used in utility boilers.

TL;DR: In this paper, a simplified model for the combustion of solid fuel particles is derived, relevant for particle sizes and shapes used in fluidized and fixed-bed combustors and gasifiers, where the conversion is related to surface area per unit volume, instead of the surface area of a single particle, and the model divides the particle into four layers: moist (virgin) wood, dry wood, char residue, and ash.

TL;DR: In this article, the main findings are related to the use of biomass ash constituents as a catalyst for the process and the application of coated heat exchangers, such that regular fluidized bed boilers can be retrofitted to become biomass gasifiers.

TL;DR: The initial experiences of using an oxygen-carrying metal oxide, ilmenite, in the 12MWth circulating fluidized bed (CFB) boiler/gasifier system at Chalmers University of Technology are presented in this paper.