Integrated modeling methodology for ash agglomeration in poly-disperse fluidized beds using particle population framework
| Autor: | James R. Kennedy, Sarma V. Pisupati, Aditi B. Khadilkar, Peter L. Rozelle |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
education.field_of_study
Thermodynamic equilibrium Economies of agglomeration General Chemical Engineering Population 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Collision 020401 chemical engineering Collision frequency Fluidized bed Particle-size distribution Particle 0204 chemical engineering 0210 nano-technology education |
| Zdroj: | Powder Technology. 384:368-378 |
| ISSN: | 0032-5910 |
| DOI: | 10.1016/j.powtec.2021.01.073 |
| Popis: | This paper discusses a unique agglomeration modeling methodology developed based on binary collisions to combine the effects of heterogeneity in ash chemistry and granular physics. A simple population balance is defined to find changes in the particle size distribution (PSD) of a fluidized bed. Thermodynamic equilibrium calculations and a computational fluid dynamics (CFD) code, are used to obtain hydrodynamic parameters. A method to calculate and use a distribution of collision frequencies in fluidized beds, corresponding to a poly-disperse particle size distribution, was developed in order to incorporate the particle level heterogeneities. A distribution of collision frequencies obtained for poly-dispersed particles showed a three orders of magnitude higher collision frequency amongst the smaller particles than the coarser ones, at the initiation of agglomeration. Ash agglomeration occurred when the slag amount (binder) was less than 10 wt% at temperatures |
| Databáze: | OpenAIRE |
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