Drying of natural zeolite powders in vibrated fuidized beds

Öcal, Cihan
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.


Usage of solar-assisted spouted bed drier in drying of pea
Şahin, Serpil; Şümnü, Servet Gülüm (2013-07-01)
The main objective of this study is to evaluate the effects of solar-assisted spouted bed and open sun drying on the drying rate and quality parameters of pea. Color, shrinkage, bulk and apparent densities, internal and bulk porosities, rehydration capacity and microstructure were the quality parameters investigated in dried product.
Characterization of gas-solid flow in conical spouted beds operating with heavy particles
Sari, Salih; Külah, Görkem; KÖKSAL, MURAT (2012-07-01)
This study presents the results of an experimental investigation of the hydrodynamics of conical spouted beds operating with high density particles. This type of spouted beds is frequently encountered in chemical vapor deposition coating of nuclear fuel elements. Measurements were performed in three 15 cm ID full circular (gamma = 30 degrees, 45 degrees, 60 degrees) and one half circular conical spouted (gamma = 30 degrees) bed with yttria-stabilized zirconia particles (d(p) = 0.5, 1 mm; rho(p) = 6050 kg/m(...
Simulation of a batch dryer by the finite difference method
Turan, Umut; Esin, Ali; Department of Food Engineering (2005)
The objectives of this study are to investigate the dynamic behavior of an apple slab subjected to drying at constant external conditions and under changing in the drying temperatures and to determine the effects of temperature and time combinations at different steps during drying on the process dynamics parameters, time constant and process gain of the system. For this purpose, a semi-batch dryer system was simulated by using integral method of analysis. Initially, the dynamic behavior of the drying tempe...
Analysis of material collected on particles exposed to volatile matter of bituminous coal in a fluidized bed
Vural, H (1997-05-01)
The activity of fluidized bed particles towards the volatile matter of a bituminous coal was analysed by measurement of tar yield and the direct measurement of CO2 concentration in the exhaust gas from the devolatilization of bituminous coal particles in a laboratory-scale fluidized bed reactor. In a third approach, thermogravimetric analysis (t.g.a.) of the fluidizing particles was performed, indicating that calcium-containing particles exhibited the largest weight loss. In a fourth approach, a mass spectr...
Physical properties of parboiled wheat and bulgur produced using spouted bed and microwave assisted spouted bed drying
Kahyaoğlu, Leyla Nesrin; Şahin, Serpil; Şümnü, Servet Gülüm (2010-05-01)
The main objective Of this Study was to compare (lie Spouted bed and microwave assisted Spouted bed drying on affecting physical properties of parboiled wheat and bulgur. Drying was performed at different temperatures (50 degrees C, 70 degrees C, 90 degrees C) and microwave powers (288 W, 624 W). Bulk and apparent density, bull( and apparent porosity, sphericity, color, microstructure and pore size distribution of parboiled wheat were investigated after drying. Yield and water absorption capacity were deter...
Citation Formats
C. Öcal, “Drying of natural zeolite powders in vibrated fuidized beds,” M.S. - Master of Science, Middle East Technical University, 2013.