Agglomeration characteristics using alternative bed materials for combustion of biomass

Upprättat; 2005; Bibliografisk uppgift: CD-ROM; 20080101 (ohmmar)
The objective of the work was to evaluate differences in agglomeration characteristics between commercially available alternative bed materials and quartz-based bed materials, commonly used in fluidised bed combustion. Pure quartz bed materials. Magnesium oxide and foundry sand (natural sand with a clay coating) were used as alternative bed aterials. Carefully controlled bench-scale fluidised bed agglomeration experiments were performed, using calcium-rich bark and potassium-rich olive residue as model fuels with significantly different ash compositions, typical for forestry and griculture residues respectively. The resulting bed material particles and agglomerates were analysed with SEM/EDS. Analysis of bed material and agglomerates suggested that Mg and Al in the bed materials affect the agglomeration temperature positively for calcium-rich fuels. Al-rich foundry sand was found to decrease the agglomeration temperature in (Si, K)-rich systems. For combustion of olive residue in MgO bed, no attack layer was formed and agglomeration probably occurred via direct adhesion by partly melted alkali-silicates. The results suggest that the choice of bed material should take the intended fuel use into consideration.

Ingår i:Biomass for energy, industry and climate protectionFlorence : ETA - Renewable Energies, s. 1343-13468889407077

Av författaren/redakt...: DeGeyter, S; Öhman, Marcus; Eriksson, M; Nordin, A; Boström, D; Berg, M

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