Development of a model for the prediction of hydrodynamics of a liquid–solid circulating fluidized beds: A full factorial design approach

Palkar, Ritesh Ramesh; Shilapuram, Vidyasagar

doi:10.1016/j.powtec.2015.04.045

Cited by 18 publications

(12 citation statements)

References 31 publications

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“…Solid holdup remarkably reduced with the rise in paddle wheel speed (Figure 8b). Increasing the paddle wheel speed ensured the uniform distribution of nutrients in the raceway pond by moving them to the other pond regions, as shown by the low solid holdup in the downstream bend [18,22]. These findings implied that high paddle wheel speeds can increase the interaction of nutrients with algae cells [39].…”

Section: Effect Of Paddle Wheel Rotational Speedsmentioning

confidence: 82%

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Two-Phase Flow Modeling of Solid Dissolution in Liquid for Nutrient Mixing Improvement in Algal Raceway Ponds

et al. 2018

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Achieving optimal nutrient concentrations is essential to increasing the biomass productivity of algal raceway ponds. Nutrient mixing or distribution in raceway ponds is significantly affected by hydrodynamic and geometric properties. The nutrient mixing in algal raceway ponds under the influence of hydrodynamic and geometric properties of ponds is yet to be explored. Such a study is required to ensure optimal nutrient concentrations in algal raceway ponds. A novel computational fluid dynamics (CFD) model based on the Euler-Euler numerical scheme was developed to investigate nutrient mixing in raceway ponds under the effects of hydrodynamic and geometric properties. Nutrient mixing was investigated by estimating the dissolution of nutrients in raceway pond water. Experimental and CFD results were compared and verified using solid-liquid mass transfer coefficient and nutrient concentrations. Solid-liquid mass transfer coefficient, solid holdup, and nutrient concentrations in algal pond were estimated with the effects of pond aspect ratios, water depths, paddle wheel speeds, and particle sizes of nutrients. From the results, it was found that the proposed CFD model effectively simulated nutrient mixing in raceway ponds. Nutrient mixing increased in narrow and shallow raceway ponds due to effective solid-liquid mass transfer. High paddle wheel speeds increased the dissolution rate of nutrients in raceway ponds.

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Section: Effect Of Paddle Wheel Rotational Speedsmentioning

confidence: 82%

“…The mass transfer coefficient significantly depends on liquid velocity, particle size, and reactor geometry [16,17]. Increasing liquid velocity helps dissolve considerable amounts of solids, thereby decreasing the amount of solid holdup in liquid [18]. A mixer is also used to promote mixing in the reactor.…”

Section: Introductionmentioning

confidence: 99%

Two-Phase Flow Modeling of Solid Dissolution in Liquid for Nutrient Mixing Improvement in Algal Raceway Ponds

et al. 2018

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“…It is affected by many parameters such as superficial gas velocity, solid circulation rate, solidity, etc. Previous study [33] gives expression for gas contact efficiency (Egs) as shown in Equation 4. It is concluded that with increasing solid holdup the contact efficiency becomes less [34].…”

Section: Figure 2 Effect Of Different Grid Resolutionmentioning

confidence: 99%

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

Dwivedi¹,

Karmakar²,

Pramanick³

et al. 2019

IJHT

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In this paper a brief review on hydrodynamic characteristic of coal gasification is presented. Firstly an introduction of hydrodynamics then parameters related to hydrodynamics is discussed. In the last several decades Coal gasification is an important method to use of coal resources. The hydrodynamic characteristics have an important role to design of Circulating fluidized bed gasifiers. Circulating fluidized bed (CFB) gasifiers widely use due to their high reaction rates and high thermal efficiency. The present study includes some hydrodynamics properties of coal gasification such as effect of pressure and temperature, solid hold up, solid circulation rate, gas-solid contact, particle residency time, coal feeding rate and coal feeding position. During the brief review on hydrodynamics characteristics of coal each section of CFBs such as riser, cyclone, stand-pipe and loop seal have been considered.

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“…Roy et al (2014) proposed a modeling framework for the simulation of the hydrodynamic characteristics of LSCFBs by using CFD modeling and a cluster structure-dependent drag model was examined by Liu et al (2015). In addition, the hydrodynamic similarity was examined to obtain the new similarity parameter for scale-up (Natarajan et al, 2014) and a full factorial design approach was discussed to develop a model for the prediction of hydrodynamics (Palkar and Shilapauram, 2015). Those works could contribute to the feasible design, operation and scale-up of LSCFBs.…”

Section: Liquid-solid Circulating Uidized Beds (Lscfbs)mentioning

confidence: 99%

Characteristics of Three-Phase (Gas–Liquid–Solid) Circulating Fluidized Beds

Kang

Kim²,

Yang

et al. 2018

Journal of Chemical Engineering of Japan

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The characteristics of three-phase (gas-liquid-solid) circulating uidized beds (TPCFBs) are discussed in order to visualize the unique features and advantages thereof due to the intrinsic ow and contacting behaviors of multi-phases, providing a better understanding of the state of art of TPCFBs and their feasible applications as multi-phase reactors and contactors. The hydrodynamics such as individual phase holdups, bubbling ow behaviors, bubble properties and liquid phase dispersions, and heat and mass transfer characteristics in the riser were examined based on the previous investigations. (k L a), gas-liquid interfacial area (a) and liquid side mass transfer coe cient (k L ) were determined. The information on the heat and mass transfer, however, were extremely limited comparing with those of hydrodynamics. Some correlations were suggested to predict the hydrodynamic parameters, and the values of h, k L a, a, and k L in the riser of the TPCFBs to provide insights for the present and future studies. The mechanism of heat and mass transfer and their modeling should be conducted for the better prediction of the performance of the TPCFB-reactors and contactors in the future. Although the information in the riser of various kinds of TPCFBs deviated from each other depending on the solid circulation modes and experimental conditions, they were summarized and consociated for the elucidation of the present states and views of the investigations. Rational guides to predict the hydrodynamics and heat and mass transfer phenomena in the riser of the TPCFB were possible by analyzing and synthesizing the results reported in the literatures presently available. Especially, the e ects of operating variables including gas (U G ) and liquid (U L ) velocities, properties of uidized solid particles and continuous liquid media, and solid circulation rate (Gs) on the hydrodynamic parameters and the heat and mass transfer characteristics such as heat transfer coe cient (h) and resistance, volumetric mass transfer coe cient

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Development of a model for the prediction of hydrodynamics of a liquid–solid circulating fluidized beds: A full factorial design approach

Cited by 18 publications

References 31 publications

Two-Phase Flow Modeling of Solid Dissolution in Liquid for Nutrient Mixing Improvement in Algal Raceway Ponds

Two-Phase Flow Modeling of Solid Dissolution in Liquid for Nutrient Mixing Improvement in Algal Raceway Ponds

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

Characteristics of Three-Phase (Gas–Liquid–Solid) Circulating Fluidized Beds

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