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| Titel: |
A STRUCTURAL PORE DEVELOPMENT MODEL FOR CALCINATION |
| Auteur: |
Keener, Sumana Khang, Soon-Jai |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 117 (1992) nr. 1 pagina's 279-291 |
| Jaar: |
1992-09-01 |
| Inhoud: |
A structural pore development model has been developed to describe microscopic pore evolution from the thermal decomposition reaction of a single calcium carbonate sphere, this model depicts a uniform distribution of equal sized pores growing from the surface of the sphere toward its center while CO2 is evolved from the pore bottom. The chemical reaction at the interface, as well as heat transfer from the surroundings to the decomposing sphere and transport of CO2 from the pore bottom to the bulk gas, are included in the model. The model shows good agreement with experimental data for CaCO3, and limestone particles of size ranging from 10 μm to 1.1 cm in diameter at various background CO2, pressures and temperatures The simulation of the calcination reaction confirms the experimental observations indicating slower calcination rates at higher background CO2 pressures, mainly due to internal unsteady-state buildup of CO2 in the pore. The effect of the background2 pressure is significantly more prominent in the smaller particles. The activation energy derived from the model is equal to 38.0 kcal/g-mol which is in the range of those reported by other investigators and is noticeably close to the heat of the calcination reaction. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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