Chauhan, Vishal and Chavan, Prakash D. and Gupta, Navneet K and Datta, Sudipta and Saha, Sujan and Sahu, Gajanan (2021) Establishing fluidization parameters of different size of coal ash particles in bubbling fluidized bed. Chemical Engineering Communications , 208 (2).
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The Fluidization behavior of coal ash particles was studied to establish fluidization parameters in a cylindrical bubbling fluidized bed. A series of experiments were carried out with different sizes of irregular coal ash particles ranging from 1 mm to 3 mm at different bed heights at atmospheric pressure and room temperature (ca. 28 °C). Fluidization regimes of all selected coal ash particles were studied by varying flow rates of fluidization medium i.e., air. The change in bed height and pressure drop across the bed was carefully analyzed to see the effects of particle size and superficial gas velocity during fluidization. The minimum fluidization velocity (Umf), minimum bubbling velocity (Umb) and fluidization index for different sizes of ash particles in cold conditions were calculated. The validation of experimental values was supported by theoretical calculations. It was observed that the Umb is 1.5–1.8 times higher than the Umf at different bed heights (Hbed). No substantial deviation was found in Umf with the variations of Hbed at a particular mean particle diameter (dp). Finally, the fluidization index between 1.58 and 1.78 for coal ash particles of Geldart-D type (dp> 1000 µm) shows an ideal condition for fluidization.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Gasification coal ash particles fluidization regimes gas-solid fluidization bubbling fluidized bed |
| Subjects: | Coal Gesification |
| Divisions: | UNSPECIFIED |
| Depositing User: | Mr. B. R. Panduranga |
| Date Deposited: | 28 Dec 2021 05:01 |
| Last Modified: | 28 Dec 2021 05:01 |
| URI: | http://cimfr.csircentral.net/id/eprint/2475 |
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