Comparative study of tuyere designs for fluidized beds

Saberi, Sh.; Saberi, Babak; Shakourzadeh, K.; Guigon, Pierre

doi:10.1016/0923-0467(95)02992-3

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…Besides, it has been found in the experiments that the spout deflection tends to occur when operating with large static bed height and high fluidization velocity in spouted and spout-fluidized beds. , The experimental observations are also used to explain the spout deflection preliminarily. Saberi et al investigated the effect of tuyere designs on gas deflection in fluidized beds. Zhong et al proposed that the merging between bubbles and the spout channel was the initial reason for spout deflection in spout-fluidized beds.…”

Section: Introductionmentioning

confidence: 99%

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Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Yue

Shen

2019

Ind. Eng. Chem. Res.

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Spout deflection is a common instability phenomenon in spout-fluidized beds. The hydrodynamics of spout deflection under several key operating variables, including static bed height (H 0), background velocity (U bg), and reactor column width (W), is investigated by means of the computational fluid dynamic-discrete element method (CFD-DEM) coupling approach. The results show that non-alternating spout deflection can be easily observed when the H 0 is larger than 236 mm or the W is less than 0.14 m in this study. For alternating spout deflection, first, there is an upper limit for its amplitude because of the self-locking phenomenon in the bottom corner. Large W promotes the regularity, while the effects of H 0 on regularity is neglectable. Thirdly, the main frequency of the alternating spout deflection reduces with increasing H 0 and increasing U bg and finally stabilizes at 1.7 Hz. This study sheds light on the design, optimization, and operation of spout-fluidized beds.

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Section: Introductionmentioning

confidence: 99%

“…16,17 The experimental observations are also used to explain the spout deflection preliminarily. Saberi et al 18 investigated the effect of tuyere designs on gas deflection in fluidized beds. Zhong et al 17 proposed that the merging between bubbles and the spout channel was the initial reason for spout deflection in spout-fluidized beds.…”

Section: Introductionmentioning

confidence: 99%

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Yue

Shen

2019

Ind. Eng. Chem. Res.

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“…The most important is to ensure an even gas distribution in the cross section of the combustion chamber , and supporting the bed , . In addition, a properly designed air distributor should: initiate smooth fluidization of particulate material , protect against backflow of solids , , , , maintain an unchanged pressure drop and ensure stable fluidization conditions at variable boiler loads , , ensure optimal pressure drop – as low as possible due to the need to limit the pumping power requirements and high enough to achieve high process parameters and effective separation of air plenum chambers from pressure fluctuations generated in the combustion chamber , produce effective gas‐solid contact and maximizing movement of solids , minimize dead zones on the distributor plate , , keep the nozzles intact during the entire service life of the grid , minimize blocking tendencies of the distributor plate , minimize channeling and gas bypassing , , minimize attrition of the fluidized particles and internal heat exchange surfaces , produce effective gas‐solid contact and maximize particle movement by influencing the hydrodynamics of the bed , , ensure the appropriate value of the gas dispersion coefficient and the jet penetration length . …”

Section: Introductionmentioning

confidence: 99%

Air Distributor Pressure Drop Analysis in a Circulating Fluidized‐Bed Boiler for Non‐reference Operating Conditions

Mirek

2020

Chem Eng & Technol

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The air distributor plays a key role in circulating fluidized-bed (CFB) boilers providing an even gas distribution in the cross section of the furnace. In most cases, this task under real conditions is very difficult to implement due to the destruction of the tuyeres. For this reason, the air distributors of many CFB boilers operate under conditions deviating from the design recommendations, which has a direct impact on the hydrodynamics of the fluidized bed and heat transfer conditions. This work reports studies on the performance of a tuyere-type air distributor utilized in a CFB boiler and working under non-reference operating conditions. Based on the results of simulation calculations, practical equations for a distributor pressure drop calculation have been derived taking into account a different degree of tuyere destruction.

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“…Experimental and numerical studies were performed for a nozzle-type distributor (tuyere with horizontal holes) to identify the main source of pressure drop across the distributor [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of fluidization velocity on solid stack volume in a bubbling fluidized-bed with nozzle-type distributor

et al. 2015

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Comparative study of tuyere designs for fluidized beds

Cited by 6 publications

References 4 publications

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Air Distributor Pressure Drop Analysis in a Circulating Fluidized‐Bed Boiler for Non‐reference Operating Conditions

Effects of fluidization velocity on solid stack volume in a bubbling fluidized-bed with nozzle-type distributor

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