Limits of stable fluidization regimes in vessel with inclined gas distributor grid

Gel'perin, N. I.; Ainshtein, V. G.; Pogorelaya, L. D.; Lyamkin, V. A.; Terekhov, N. I.; Novpbratskii, V. L.

doi:10.1007/bf00727482

Cited by 2 publications

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“…Gelperin et al [32] studied the variation in fluidization along an angled distributor plate and found the minimum fluidization velocity to vary from a minimum value at the site of the lowest bed height (highest point of distributor plate) to a maximum at the site of the greatest bed height (lowest point of the distributor plate). This variation created a gradient in the effective fluidization velocity and pressure experienced in different regions of the bed.…”

Section: Effect Of Bed Heightmentioning

confidence: 99%

Effect of Distributor Plate Configuration on Pressure Drop in a Bubbling Fluidized Bed Reactor

Ghaly

Ergüdenler

Ramakrishnan

2015

AIR

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Aim: To study the effects of distributor plate shape and conical angle on the pressure drop were studied in a pilot scale fluidized bed system. Methodology: Five distributor plates (flat, concave with 5°, concave with 10°, convex with 5° and convex with 10°) were used in the study. The system was tested at two levels of sand particle size (a fine sand of 198 µm and coarse sand of 536 µm), various bed heights (0.5 D, 1.0 D, 1.5 D and 2.0 Dcm) and various fluidization velocities (1.25, 1.50, 1.75 and 2.00 U mf ). Results: The pressure drop was affected by the shape and the conical angle of distributor plate, sand particle size and bed height. Less than theoretical values of the pressure drop were observed with the 10° concave distributor plate at lower fluidizing gas velocities for all bed heights. A decrease in the angle of convex and an increase in the angle of concave resulted in a decreased pressure drop. Greater values of pressure drop were obtained with larger sand particles than those obtained with small sand particles at all fluidizing velocities and bed heights. For all distributor

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Section: Effect Of Bed Heightmentioning

confidence: 99%

Effect of Distributor Plate Configuration on Pressure Drop in a Bubbling Fluidized Bed Reactor

Ghaly

Ergüdenler

Ramakrishnan

2015

AIR

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“…Increasing the pressure drop across the distributor lead to increases in bubble size and rise time resulting in reduced residence time. Gelperin et al (1982) studied the variation in fluidization along an angled distributor plate and found the minimum fluidization velocity to vary from a minimum value at the site of the lowest bed height (highest point of distributor plate) to a maximum at the site of the greatest bed height (lowest point of the distributor plate). This variation created a gradient in the effective fluidization velocity experienced in different regions of the bed.…”

Section: Effect Of Distributor Platementioning

confidence: 99%

Mixing Patterns and Residence Time Determination in a Bubbling Fluidized Bed System

Yas¹

2012

American Journal of Engineering and Applied Sciences

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Fluidized bed gasification can be used to convert the solar energy stored as carboneous compounds in bio-mass into a carbon neutral fuel with reduced emissions. Canada produces 20.57 million tonnes of wheat straw annually which could be used for green energy production. Wheat straw residue gasification has the capability of replacing 7.5 % (0.62 EJ) of Canadaâs annual fossil fuel consumption. To achieve efficient gasification in a fluidized bed proper fuel mixing and residence time must be achieved. The aim of this study was to investigate the effects of sand particle size, distributor plate shape and angle, bed height and fluidizing velocity on particle mixing and residence time in the fluidized bed reactor. Greater values of the residence time were obtained with course sand whereas lower values were obtained with fine sand. An in-crease in the angle of convex or a decrease in the angle of a concave of the distributor plate resulted in an increase in the residence time. Both the concave and convex distributor plates achieved vertical upward and downward movements of the bed material resulting in continuous bed material turnover and, thus, good mixing. However, the concave plate achieved longer residence time which will result in better conversion efficiency. To improve the mixing properties of the binary mixture, which has great tendency for segregation due to density differences, an angled distributor plate (concave or convex) should be used. Considerable increases in the residence time were recorded with increases in the bed height. Increasing the fluidizing velocity decreased the residence time due to the increase in the bubble velocity. However, since the conversion efficiency is affected by the degree of mixing, it will also be improved by increasing the fluidization velocity. A velocity above 1.50 U_mf is recommended for better fluidization and improved mixing

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Limits of stable fluidization regimes in vessel with inclined gas distributor grid

Cited by 2 publications

References 0 publications

Effect of Distributor Plate Configuration on Pressure Drop in a Bubbling Fluidized Bed Reactor

Effect of Distributor Plate Configuration on Pressure Drop in a Bubbling Fluidized Bed Reactor

Mixing Patterns and Residence Time Determination in a Bubbling Fluidized Bed System

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