Experimental investigation on effects of solid concentration, chemical additives, and shear rate on the rheological properties of bottom ash (BA) slurry
TL;DR: In this paper, an experimental analysis is done for understanding the effect of various parameters like shear rate, solid concentration, and particle size on rheological behavior of bottom ash slurry.
Abstract: An experimental analysis is done for understanding the effect of various parameters like shear rate, solid concentration, and particle size on rheological behavior of bottom ash slurry. The coarser...
Citations
More filters
TL;DR: The bagging technique is introduced which is an Ensemble based data-driven model using the PCE and allows to reduce the validation error of the model by up to two orders of magnitude, which reduces considerably the variability on the estimation of hyperparameters in the model.
11 citations
TL;DR: In this article, the stability and rheological behavior of OWS has been analyzed for economic pipeline transportation of iron ore slurries and it has been shown that the stability of the OWS provides an indication of the process of transportation.
10 citations
TL;DR: In this paper, the erosive wear rate caused by slurry flow is investigated using four computational-based erosion models viz. Generic, Oka, Finnie and Mclaury through horizontal mitre pipe bend instigated by bottom ash particulates slurry.
Abstract: The erosive wear rate caused by slurry flow is the worst phenomenon associated with complex geometry like bend, curved cross section and rotating machinery. The numerous quantitative research is available in the past for findings of erosive wear rate through pipe bend, but findings of erosive wear rate through pipe bend using Fluent based various erosion models are not yet established. In the present work, erosion wear rate using four computational-based erosion models viz. Generic, Oka, Finnie and Mclaury through horizontal mitre pipe bend instigated by bottom ash particulates slurry has been investigated using Fluent code. The solid particulates of spherical shapes 162 µm, 300 µm and 445 µm having density 2219 kg/m3 were tracked to compute the erosion wear rate using Discrete Phase Model (DPM). The particulates were tracked using Eulerian–Lagrangian approach coupled with k−ɛ turbulent model at volume fraction ranging from 2.5 to 10% for wide range of velocities viz. 1–10 ms−1. Additionally, the results of DPM concentration, turbulence intensity, velocity and particle tracking using particulate residence time were predicted to analyze the erosive rate through pipe bend. The simulated outcomes show that the maximum erosion wear rate exists at the extrados of pipeline near the bend exit. Finally, the effects of particulate size, concentration and velocity were discussed on erosion wear rate. Furthermore, the simulated outcomes obtained through computational erosion models were verified with the available experimental data and findings show that the outcomes obtained with Generic model could be the benchmark for designing the slurry pipeline bend.
9 citations
TL;DR: The various properties of carrier flow (e.g., coal, fly, and bottom-ash slurries) having a major impact in determining the equipment life of various slurry transportation components such as pipeline.
Abstract: The various properties of carrier flow (e.g. coal, fly, and bottom-ash slurries) having a major impact in determining the equipment life of various slurry transportation components such as pipeline...
4 citations
1 citations
References
More filters
TL;DR: In this article, the rheological behavior of fly ash samples collected from a thermal power plant has been investigated over a range of volumetric solids concentration in shear rate range of 10−200 s−1.
99 citations
TL;DR: In this article, a coal-water mixture with up to 60% solid Bickershaw coal with low ash content (4.0% and 6.86%) was produced at acceptable viscosities in the presence of a non-ionic surfactant, Triton X-405.
89 citations
TL;DR: In this article, the effects of coal characteristics on the properties of coal water slurry (CWS) were systemically studied using sixteen Chinese coals of different ranks from lignite to anthracite.
Abstract: The effects of coal characteristics on the properties of coal water slurry (CWS) were systemically studied using sixteen Chinese coals of different ranks from lignite to anthracite. The correlation between coal properties and CWS characteristics were investigated by multivariate progressive regression analysis. CWS properties examined in this study included slurryability (concentration of slurry that gives an apparent viscosity at 1200 mPa · s at a shear rate of 28.38 s−1), rheological behavior (represented by a flow index), and static stability (days for formation of soft sediment). Coal properties examined in the study included coal rank, air equilibrium moisture (Mad), maximum moisture holding capacity (MHC), ash content, surface properties, petrographic macerals, pore structure, and adsorption characteristics of dispersants.
62 citations
"Experimental investigation on effec..." refers background in this paper
...In last decade, the transportation of coal ash slurry at high concentration is also suggested by some researchers (Senapati, Mishra, and Parida 2013; Seshadri et al. 2005; Yuchi et al. 2005)....
[...]
TL;DR: In this paper, the effect of additive on pressure drop and rheological characteristics of fly ash slurry at high concentration (above C w ǫ ≥ 60% by weight) was reported.
Abstract: The present study reports the effect of additive on pressure drop and rheological characteristics of fly ash slurry at high concentration (above C w ≈ 60% by weight). Pressure drop has been measured using a pilot plant test loop for fly ash slurry at various concentrations with and without additive. Mixture of sodium carbonate and Henko detergent has been used as a additive. Rheological studies are also carried out for fly ash slurry at the same concentrations. By using the rheological data, pressure drop has been predicted in a straight pipeline of 40 mm diameter at higher concentrations. Experimental results obtained from a pilot plant test loop were compared to the analytical results based on the Darby and Melson (1981) algorithm. The comparison showed very good agreement between these sets of data, and it is found that there is reduction in pressure drop when additive like soap solution is added to the fly ash slurry at higher concentrations.
61 citations
TL;DR: In this paper, the effects of particle size on various slurry flow parameters such as pressure drop, solid phase velocity distribution, friction factor, granular pressure, turbulent viscosity, turbulent kinetic energy and its dissipation have been analyzed.
Abstract: The paper presents three-dimensional CFD analysis of two-phase (sand-water) slurry flows through 263 mm diameter pipe in horizontal orientation for mixture velocity range of 3.5–4.7 m/s and efflux concentration range of 9.95– 34% with three particle sizes viz. 0.165 mm, 0.29 mm and 0.55 mm with density 2650 kg/m3. RNG k-e turbulence closure equations with Eulerian multi-phase model is used to simulate various slurry flows. The simulated values of local solid concentration are compared with the experimental data and are found to be in good agreement for all particle sizes. Effects of particle size on various slurry flow parameters such as pressure drop, solid phase velocity distribution, friction factor, granular pressure, turbulent viscosity, turbulent kinetic energy and its dissipation have been analyzed.
60 citations