|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Development of a Fluidized-Bed Ash Agglomeration Modeling Methodology to Include Particle-Level Heterogeneities in Ash Chemistry and Granular Physics
||Aditi B Khadilkar, Peter L Rozelle, Sarma V Pisupati
|On-Site Speaker (Planned)
||Sarma V Pisupati
In fluidized bed gasification and combustion systems, agglomeration occurs by sticking of fuel ash particles that are wetted by slag-liquid. The non-uniform temperature, gaseous atmosphere and heterogeneity in ash chemical composition need to be accounted for in the prediction of the slag-liquid formation and composition. Penn State developed a modelling methodology in which thermodynamic equilibrium calculations are used to estimate the amount of slag-liquid in the system and computational fluid dynamics modeling is used in conjunction to obtain the initial granular physics inputs. The results of this study indicated that agglomerate growth in fluidized bed combustors (FBC) is initiated at the particle-level by low-melting components rich in iron- and calcium-based minerals. Study of particle-level heterogeneities in ash composition revealed that agglomeration can begin at lower temperatures than the FBC operating temperatures of 850 °C, which would be remain undetected by bulk analysis alone.
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