1988
DOI: 10.1002/cjce.5450660604
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Solids circulation in a spout‐fluid bed with draft tibe

Abstract: A 20 cm diameter semi-cylindrical spout-fluid bed with a draft tube has been used to study the effects of operating and geometric parameters on the solids circulation rates at ambient temperature. A new technique has been developed for measuring the solids fluxes with great accuracy. Solids circulation rate data have been found to be strongly influenced by both geometry and relative magnitude of spouting and auxiliary gas flowrates, as they in turn affect the flow of the gas-solid mixture inside the draft tube… Show more

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Cited by 53 publications
(33 citation statements)
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“…Also, in this study particle velocity in annulus ( V PA ) was measured, and the solids circulation rate ( W S ) was calculated from the mass balance of particles in the annulus as shown in the following equation: V PA was determined by measurement of the average time for coloured tracer particles to descend the 50 mm section in the upper part of annulus region. Although the descending particle velocity in the annulus region has a radial distribution in the case of a conventional spouted bed without a draft tube (He et al, 1994; Tsuji et al, 1997; Olazar et al, 2001), this method is applicable roughly and taken for a spouted bed with a draft tube or a spout‐fluid bed with a draft tube unless the annulus region becomes fluidized (Berruti et al, 1988; Muir et al, 1990; Hadzismajlovic et al, 1992; Ji et al, 1998). According to Hadzismajlovic et al (1992), the particle velocity in the annulus is uniform except in the cone section.…”
Section: Methodsmentioning
confidence: 99%
“…Also, in this study particle velocity in annulus ( V PA ) was measured, and the solids circulation rate ( W S ) was calculated from the mass balance of particles in the annulus as shown in the following equation: V PA was determined by measurement of the average time for coloured tracer particles to descend the 50 mm section in the upper part of annulus region. Although the descending particle velocity in the annulus region has a radial distribution in the case of a conventional spouted bed without a draft tube (He et al, 1994; Tsuji et al, 1997; Olazar et al, 2001), this method is applicable roughly and taken for a spouted bed with a draft tube or a spout‐fluid bed with a draft tube unless the annulus region becomes fluidized (Berruti et al, 1988; Muir et al, 1990; Hadzismajlovic et al, 1992; Ji et al, 1998). According to Hadzismajlovic et al (1992), the particle velocity in the annulus is uniform except in the cone section.…”
Section: Methodsmentioning
confidence: 99%
“…Its H m becomes limited only by the energy of the gas stream entering the bottom of the draft tube [5,6]. Besides overcoming the bed height limitation, a draft tube spouted bed (DTSB) has several other advantages.…”
Section: Introductionmentioning
confidence: 99%
“…Comparing with conventional spouted bed with or without a draft tube, and spout‐fluid bed without a draft tube, there is relatively very limited information available on the hydrodynamic behaviour of DTSFB (Yang and Keairns, 1983; Berruti et al, 1988; Muir et al, 1990; Grbavcic et al, 1992; Xiao et al, 2002; Osorio‐Revilla et al, 2004). Minimum spouting velocity is one of the most important flow characteristics for proper design and operation of the spouted bed reactors.…”
Section: Introductionmentioning
confidence: 99%