Radial concentration profiles in a fast fluidised bed

Dry, R.J.

doi:10.1016/0032-5910(86)85002-1

Cited by 33 publications

(11 citation statements)

References 4 publications

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“…(5), a zero solids concentration in the tube centre is predicted which is contradictory to experimental observations (Dry, 1986;Miller and Gidaspow, 1992). In this work, therefore, eq.…”

Section: Constitutive Relations Lcontrasting

confidence: 85%

Hydrodynamic modelling of circulating fluidised beds

Nieuwland

Huizenga

Kuipers

et al. 1994

Chemical Engineering Science

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Abstract-A one-dimensional model for the riser section of a circulating fluidised bed has been developed which describes the steady-state hydrodynamic key variables in the radial direction for fully developed axisymmetric flow. Both the gas and the solid phase are considered as two continuous media, fully penetrating each other. As a first approximation gas phase turbulence has been incorporated in our hydrodynamic model by applying a slightly modified version of the well-known Prandtl mixing length model. To solve the resulting set of transport equations, the solids distribution along the tube radius is required. Several strategies are given to obtain this information. In addition the effect of clusters on the momentum transfer between both phases has been modelled using an empirical correlation. Theoretically calculated results agree welt with reported experimental data of different authors.

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“…(5), a zero solids concentration in the tube centre is predicted which is contradictory to experimental observations (Dry, 1986;Miller and Gidaspow, 1992). In this work, therefore, eq.…”

Section: Constitutive Relations Lcontrasting

confidence: 85%

Hydrodynamic modelling of circulating fluidised beds

Nieuwland

Huizenga

Kuipers

et al. 1994

Chemical Engineering Science

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“…Many scholars developed experimental equations for estimating minimum fluidization velocity. [4,6,19,29,34,36,37] Nevertheless, the experimental equation developed by Wen and Yu is the most popular for calculating minimum fluidization velocity; [2,37] this experimental equation was given as Equation 8:…”

Section: Measurement Of Minimum Fluidization Velocity and Bed Pressurmentioning

confidence: 99%

“…The main difference between these 2 incinerators is that the latter requires higher superficial velocity than the BFBI and a cyclone to recycle disengaged particles. [1,4,5] Fluidized bed incinerators are widely utilized for mixing or drying materials, chemical reactions, bio-fuel manufacturing, and waste treatment, and are accepted as a safe, effective, viable and foolproof in industry. [6] Most incinerators in industry have a three-dimensional geometry, such as a cylinder.…”

Section: Introductionmentioning

confidence: 99%

Effects of pressure drop and superficial velocity on the bubbling fluidized bed incinerator

Wang

Chen

Lei

et al. 2007

Journal of Environmental Science and Health, Part A

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Since performance and operational conditions, such as superficial velocity, pressure drop, particles viodage, and terminal velocity, are difficult to measure on an incinerator, this study used computational fluid dynamics (CFD) to determine numerical solutions. The effects of pressure drop and superficial velocity on a bubbling fluidized bed incinerator (BFBI) were evaluated. Analytical results indicated that simulation models were able to effectively predict the relationship between superficial velocity and pressure drop over bed height in the BFBI. Second, the models in BFBI were simplified to simulate scale-up beds without excessive computation time. Moreover, simulation and experimental results showed that minimum fluidization velocity of the BFBI must be controlled in at 0.188-3.684 m/s and pressure drop was mainly caused by bed particles.

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“…This non-uniformity is the key flow characteristic of a CFB which has been confirmed by many experimental research works (e.g. [8,33]). The proposed DCM model is successful in this simulation.…”

Section: Apply the Dcm Methods To A Bench-scale Cfb With Square-cross-mentioning

confidence: 52%