Abstract
The objective of this work was to generate comprehensive data on the formation of residual fly ash during the initial stages of suspension firing of biomass. Combustion experiments were carried out with pulverized biomass fuels (two straw fuels and two wood fuels), in an entrained flow reactor at 1200–1400 °C, simulating full-scale suspension firing of biomass. By the use of a movable, cooled, and quenched gas/particle sampling probe, samples were collected at different positions along the vertical axis in the reactor, corresponding to gas residence times ranging from 0.25 to 2.0 s. The collected particles were subjected to various analyses, including char burnout level, particle size distribution, elemental composition, and particle morphology and composition. Furthermore, the transient release, i.e., the vaporization of the flame-volatilized inorganic elements K, Cl, and S, from the burning fuel particles to the gas phase, has been quantified using two different calculation methods. The ash formation me...
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