Publication | Peer reviewed papers | Potentiale, Bioenergiesysteme, Logistik

Bed material performance of quartz, natural K-feldspar, and olivine in bubbling fluidized bed combustion of barley straw

Published 15 May 2024

Citation: Bozaghian Bäckman M, Rebbling A, Kuba M, Larsson SH, Skoglund N. Bed material performance of quartz, natural K-feldspar, and olivine in bubbling fluidized bed combustion of barley straw. Fuel. 15 May 2024.364:130788.

Abstract


The present study investigates how three different silicate-based bed materials behave in bubbling fluidized bed combustion of a model agricultural residue with respect to ash composition, namely barley straw. Quartz, natural K-feldspar, and olivine were all used in combustion at 700 °C, and the resulting layer formation and bed agglomeration characteristics were determined. Based on this, a general reaction model for bed ash from agricultural residues was proposed, taking into account the reactivity of the different silicates investigated towards the main ash-forming elements K, Ca, and Si. The proposed reaction model links bed material interaction with K-rich bed ash to the degree of polymerization of the silicate bed material, where addition reactions occur in systems with high polymerization, predominately in quartz, and substitution reactions dominate for depolymerized silicates such as K-feldspar and olivine.

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