The influence of vessel geometry on fluidized bed dryer hydrodynamics

Wormsbecker, Michael; Ommen, J. Ruud van; Nijenhuis, John; Tanfara, Helen; Pugsley, Todd

doi:10.1016/j.powtec.2009.03.036

Cited by 37 publications

(31 citation statements)

References 27 publications

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“…The goal of fluidisation is that the bed weight is equal to the fluid drag force so that the particles don"t rest on each other anymore. References [7] and [9] concluded that a fluidised bed works at optimum heat and mass transfer rates as well as particle and gas residence time distribution when the gas and particle flow are counter-current, creating adequate contact between the gas and particles [7]. The distributor plate has a dual function namely distributing the fluidising gas into the bed as well as supporting the solid particle bed.…”

Section: A Fluidised Bed Granulationmentioning

confidence: 99%

Determining Granule Movement and Attrition Breakage in a Fluidised Bed with Different Perforated Plate Designs

2016

International Conference on Advances in Science, Engineering, Technology and Natural Resources (ICASETNR-16) Nov. 24-25, 2016 P

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Abstract-In this study the movement of ammonium nitrate granules in a fluidised bed pilot plant is investigated for three different perforated plate designs at two different fluidisation velocities each. A qualitative and quantitative study is done to evaluate the degree of mixing that takes place. The attrition breakage for each plate is determined as a secondary objective. The granulation of ammonium nitrate through fluidisation is commonly used in the manufacturing of porous ammonium nitrate.The aim of this project is to make use of particle size analysis to determine the extent of particle movement in a fluidised bed. The bed is initially loaded with layers containing different particle sizes, making it possible to analyse how much mixing occurs while the bed is operated. In subsequent experimentation, a colourant is injected into the fluidised bed while the fluidised bed is in operation. The samples taken from the fluidised bed, representing both distance from the colourant injection point as well as depth in the bed, are being rated on the amount of colourant present in each, indicating how the colourant was distributed within the bed.The attrition breakage in each case is investigated using a mass balance on each of the three sizes of particles present in the bed. An increase in the mass of very fine particles indicates whether breakage through attrition is present and to what extent.

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Section: A Fluidised Bed Granulationmentioning

confidence: 99%

Determining Granule Movement and Attrition Breakage in a Fluidised Bed with Different Perforated Plate Designs

2016

International Conference on Advances in Science, Engineering, Technology and Natural Resources (ICASETNR-16) Nov. 24-25, 2016 P

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“…Transport of the salt crystals through the rotary dryer is affected by the slowly rotating shell. The slope of the rotary dryer helps the axial movement [10,11]. Within the rotary dryer, the salt grains are lifted and showered through the hot air bulk by flights.…”

Section: Introductionmentioning

confidence: 99%

The Experimental Survey on the Rotary Dryer Performance: Drying of Wetted Salt from Effluent Bio Wastewater

Jafari

Farahbod

2017

JABB

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This work presents the effective optimum parameters of one rotary dryer such as energy consumption, optimum drying time, color and size distribution of outlet sodium chloride crystals from dryer and the amount of distilled water. The experimental results show, the maximum deviation between salt production in 12 minutes as drying time and production of dried saline crystals in 15.2 minutes is only 8% but since of the quality of outlet dried saline crystals is optimized in 15.2 minutes so this drying time is introduced as optimized time for drying. Also, the moisture content (kg) per dried salt (kg) in this condition is 0.005. According to the literature, this amount of moisture content in outlet dried saline crystals is very suitable.

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“…In addition to the interphase mass transfer, gas-backmixing in the emulsion phase can influence the reaction performance. Historically the main focus in rectifying this problem was therefore to reduce the bubble sizes in the fluidised bed reactor (FBR) [1,3,4,[6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Ouyang & Levenspiel [27], Chyang et al [7,9,28], Sreenivasan & Raghavan [8] and Wormsdecker et al [10] compared the influence of horizontal injection of gas to induce a swirling bed FBR to the normal axial injection distributor. They found that the deficiency of the bubbling regime can be addressed by increasing the horizontal momentum in the bed.…”

Section: Introductionmentioning

confidence: 99%

Two dimensional fluidised bed reactor: Performance of a novel multi-vortex distributor

Brink¹,

Saayman²,

Nicol³

2011

Chemical Engineering Journal

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The influence of the distributor configuration on interphase mass transfer, gas axial dispersion and bubble size was studied in a 2-D fluidised bed reactor for two types of distributor configurations; a novel multi-vortex (MV) distributor with tuyéres directed vertically and horizontally at different heights and a standard perforated plate distributor (baseline). The linear inlet velocity (U 0 ) ranged between 0.1 m/s and 0.35 m/s, with air as fluidising medium at ambient conditions. The ozone decomposition reaction over Fe 2 O 3 impregnated FCC catalyst was used as an indirect measure of the performance of the FBR and it was found that the MV distributor causes a significant improvement (15% average) in the conversion efficiencies at all velocities tested. Bubble size measurements (using two separate techniques) indicated larger bubbles for the MV distributor, while the visual bubbling to turbulent transition boundary (U c ) for the MV distributor was found to be lower than the baseline distributor. The interphase bubble-emulsion mass transfer was quantified using the model derived by Thompson et al. (1999) and was found to be 52% higher for the MV distributor than the baseline distributor. In addition the MV distributor exhibited near plug flow characteristics at velocities exceeding U c , while this was not the case for the baseline distributor.

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The influence of vessel geometry on fluidized bed dryer hydrodynamics

Cited by 37 publications

References 27 publications

Determining Granule Movement and Attrition Breakage in a Fluidised Bed with Different Perforated Plate Designs

Determining Granule Movement and Attrition Breakage in a Fluidised Bed with Different Perforated Plate Designs

The Experimental Survey on the Rotary Dryer Performance: Drying of Wetted Salt from Effluent Bio Wastewater

Two dimensional fluidised bed reactor: Performance of a novel multi-vortex distributor

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