Drying of natural zeolite powders in vibrated fuidized beds

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2013

Author

Öcal, Cihan

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The objectives of this study were to characterize the fluidization behavior and the drying performance of a vibrated fluidized bed dryer operating with animal feed additive ‘Clinoptilolite’ bed material with a mean particle size of 3 microns, and determine the efficient operating conditions for the drying process. For this purpose, two fully equipped vibrated fluidized bed systems were designed and constructed for the analyses related to hydrodynamic and drying tests, respectively. The hydrodynamic test results showed that the fluidization quality increased with both vibration strength and vibration frequency. Moisture content of the bed material was found to be very important on hydrodynamic parameters. Among the experimental conditions used in the hydrodynamic tests, the vibration strength of 1.8 and the vibration frequency of 40 Hz were chosen as the most effective vibration conditions for a high quality fluidization of the clinoptilolite powders. On the basis of the results of batch drying tests, drying curves indicated that the drying rate increased with the inlet gas temperature and superficial gas velocity. Based on a rough estimate of operating cost considering the electrical energy need for heating the drying gas, the conditions of 90 °C temperature and 10.5 mm/s gas velocity were recommended for a cost-effective continuous drying operation of clinoptilolite powders.

Subject Keywords

Zeolites., Powders., Fluidized-bed combustion., Fluidized-bed furnaces., Clinoptilolite., Drying.

URI

http://etd.lib.metu.edu.tr/upload/12616219/index.pdf
https://hdl.handle.net/11511/22783

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

C. Öcal, “Drying of natural zeolite powders in vibrated fuidized beds,” M.S. - Master of Science, Middle East Technical University, 2013.