The Effect of Selective Additives on the Rheological Behavior of Power Plant Ash Slurry

Pani, G. K.; Rath, Prasenjit; Barik, Rasmita; Senapati, Pradipta Kumar

doi:10.1080/02726351.2014.990657

Cited by 16 publications

(10 citation statements)

References 12 publications

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“…Gopaliya and Kaushal [17] analysed the effects of grain sizes on the slurry flow characteristics in horizontal pipelines implementing RNG k-ɛ turbulence model. Pani et al [18] studied the rheological behaviour of coal ash slurry and investigated the effects of chosen additives on it. Assefa and Kaushal [19] carried the experimental investigations on bottom/fly-ash slurry with/without additions of fly/bottom ash in order to evaluate its rheological behaviour.…”

Section: Introductionmentioning

confidence: 99%

Flow Characterization of Multi-Phase Particulate Slurry in Thermal Power Plants Using Computational Fluid Dynamics

Parkash¹

2020

Journal of Thermal Engineering

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The key issue associated with the thermal power plant is the disposal of ash-water slurry and the process of its transportation is accomplished using long length pipelines. The designing of such pipelines is a vital endeavor of researchers and designers globally. In this perspective, numerical simulation of 42 mm diameter three-dimensional slurry flow pipeline carrying high concentration of mono-dispersed fine ash particles has been carried out. The study is enunciated by employing Eulerian-Eulerian two-phase model with RNG k-ɛ turbulence model with the aim of visualizing and understanding the characteristics of the slurry flow behavior. The coal ash slurry concentration varies between 50% to 70% (by weight) for velocity ranges, 1-3 ms -1 . The modeling is done using Fluent commercial software with the intention of predicting the characteristics of flow for 300 µm particle size. It is observed that pressure drop upsurges non-linearly with solid concentrations and slurry velocity across pipeline. The obtained results of predetermined pressure drop are analytically compared with the experimental results. Moreover, the results are also compared with that of Eulerian-Langrange model using SST K-ω turbulence model and it is found that RNG k-ɛ turbulence model yields more accurate and desirable results.

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Section: Introductionmentioning

confidence: 99%

Flow Characterization of Multi-Phase Particulate Slurry in Thermal Power Plants Using Computational Fluid Dynamics

Parkash¹

2020

Journal of Thermal Engineering

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“…Pani et al [18] studied the additives effect on the rheological behaviour of coal ash slurry. Assefa and Kaushal [19] carried out the experiment by adding the fly ash slurry in the bottom ash slurry and evaluated the rheological characteristics that results the decrease in yield stress and viscosity of the slurry. Later, the CFD simulation of sand water flow in a horizontal pipeline was by Swamy et al [20].…”

Section: Introductionmentioning

confidence: 99%

Analytical and Comparative Investigation of Particulate Size Effect on Slurry Flow Characteristics Using Computational Fluid Dynamics

Parkash¹,

Kumar

Sikarwar³

2021

Journal of Thermal Engineering

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The key issue associated with the industries is the transportation and dumping of solids particulates in the form of slurry at the desired place using long length pipelines. In this perspective, numerical simulation of three-dimensional horizontal slurry pipeline of 0.0549 m diameter using Eulerian two-phase model with RNG kɛ turbulence closure is carried out. The glass -beads solid particulates having density (  = 2470 kg/m 3 ) and slurry concentration varies as 10% to 50% (by volume) for velocity ranges of 3-5 ms -1 . The computational modeling is done using available commercial software ANSYS Fluent for 125µm and 440 µm particulate size at different velocity and concentration range to know their effect on slurry flow characteristics. It is observed that for chosen particulate size pressure drop increases with increase in velocity at all solid concentration range. The pressure drop in slurry for 440 µm solid particulates is found higher as compared to the pressure drop of 125 µm solid particulates slurry. The percentage change in pressure drop is also reported in the paper due to particulate size effect at all velocity and solid concentration. The obtained results of predicted pressure drop are analytically compared with the available experimental results of literature and are in synchronism with that. A parametric study is carried out with the aim of visualizing and understanding the solid particulate size effect on slurry flow characteristics. Finally, the results of settling solid concentration contour, velocity contour, concentration profiles, velocity profiles and vector representation of concentration/velocity were also predicted for chosen particulates sized slurry.

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“…In previous years, several investigations 4–7 have been carried out to determine the rheological characteristics of multiparticulate slurry at different solid concentrations with and without additives. Zhu et al.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, pipelines can be laid in difficult geographic areas, reduce traffic, require little maintenance, and are reliable and operational throughout the year. 2,3 In previous years, several investigations [4][5][6][7] have been carried out to determine the rheological characteristics of multiparticulate slurry at different solid concentrations with and without additives. Zhu et al 4 investigated the effect of starch-based dispersants on the physical and chemical properties of a coal-water slurry.…”

Section: Introductionmentioning

confidence: 99%

“…The result shows the exponential increase in slurry viscosity above 50 wt% solid concentrations. Pani et al 7 investigated the effect of Ghari detergent powder and sodium silicate on the rheological characteristics of coal ash slurry for a solid concentration range of 50-60 wt%. Results show that slurry exhibits Bingham plastic behavior and a gradual decrease in apparent viscosity was observed with the addition of an additive (i.e.…”

Section: Introductionmentioning

confidence: 99%

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An experimental study on head loss characteristics of pipe bends for flow of coal–water slurry at high solid concentration

Singh

Kumar

Mohapatra

2019

Proceedings of the Institution of Mechanical Engineers, Part E:

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Bending of pipes is a major problem facing the engineers during the construction of a long pipeline for transporting coal–water slurry. However, the use of 90° bends in slurry transportation is restricted because it causes high head loss, and so very high pumping power is required to overcome this resistance. In this context, the present study is carried out to reduce the head loss for the flow of coal–water suspension across 90° pipe bends by varying bend geometry. Rheological experiments were performed to study flow characteristics of coal–water suspension with/without the additive. Coal–water slurry exhibits Newtonian behavior at a solid concentration of 30 wt% and pseudoplastic flow nature at concentration above 30%. Head loss experiments were carried out on a pilot plant test loop for a solid concentration of 30.27–61.56% with flow velocity ranging from 2 to 5 m/s. The r/ D ratio for the pipe bend varied within the range of 1.5–2.5. The present study reveals that the head loss across pipe bends increased as solid concentration and flow velocity was increased. The optimum r/ D ratio value for a minimum head loss was found to be 2.0. Also, significant decreases in apparent viscosity and head loss were perceived with the addition of a small amount of sulfonic acid. Power required to pump coal–water slurry was decreased by 15.93% with the use of an additive. A correlation for the head loss in terms of solid concentration, flow velocity, and r/ D ratio was also developed.

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The Effect of Selective Additives on the Rheological Behavior of Power Plant Ash Slurry

Cited by 16 publications

References 12 publications

Flow Characterization of Multi-Phase Particulate Slurry in Thermal Power Plants Using Computational Fluid Dynamics

Flow Characterization of Multi-Phase Particulate Slurry in Thermal Power Plants Using Computational Fluid Dynamics

Analytical and Comparative Investigation of Particulate Size Effect on Slurry Flow Characteristics Using Computational Fluid Dynamics

An experimental study on head loss characteristics of pipe bends for flow of coal–water slurry at high solid concentration

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