Abstract
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.
Highlights
The electrical power generation in thermal power plants utilizes the combustion of coal which results in huge amount of fly and bottom ash
The results predicted by Eulerian-Eulerian two-phase model at different velocities and solid concentrations have been plotted in the Figs 2-8
The numerical simulation process has been accomplished for fly ash concentrations ranging 50% to 70% in flow velocities varying between 1 m/sec and 3 m/sec
Summary
The electrical power generation in thermal power plants utilizes the combustion of coal which results in huge amount of fly and bottom ash. The optimum concentrations of fly-ash slurries on the basis of specific energy consumptions is found to be 65 % (by weight) [14] The numerical investigation on the sand-water slurry flow through pipeline has been carried out by Nabil et al [15] They considered three different particle sizes of 0.2, 0.7 and 1.4 mm for 0.5 to 5 m/sec velocity range and found that the irregularities goes up with particle’s size due to gravitational effect. The experimental and numerical simulation of sand water slurry flow in 263 mm diameter pipe at different velocities is done using Eulerian multiphase renormalization group k-ε turbulence model They noticed that the pressure gradient is more dominant on the efflux concentrations.
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