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Study of Mixing Binary Solids in Tapered Beds with Inlet Jets Using DPM Technique

Roosta, Mohsen | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52625 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaei Dehkordi, Asghar
  7. Abstract:
  8. In this study, mixing of binary solids in Tapered beds with inlet jet using solid particle particle techniques was investigated. A two-dimensional model in which the motion of solid particles and gas in two dimensions is studied is used to simulate the conical beds. For the particle phase by solving the equations obtained with the gas phase equations simultaneously considering the equations and collisions between particles and the gas with the particle is simulated using DEM model. In this study, mixing of binary solids with two different sizes and the influence of simulation parameters such as inlet jet velocity, jet position, using multiple jets instead of single jet with same inlet flow, initial solid particle height, bed apex angle, diameter ratio Solid particles, solid particle density ratios and initial curvature layout have been studied. In this study, these parameters were investigated by using Lacy mixing coefficient equal to zero in case of complete mixing and equal to one in case of particle separation. It is concluded that by increasing the inlet jet velocity and decreasing the initial height of the solid particles in the bed, the mixing coefficient and consequently the bed mixing is increased. As the angle of the bed increases, the mixture increases, but if the angle exceeds one, it decreases because of the large drop in axial velocity of the particles. As the jet shifts from the center to the wall, the bed mixing decreases. The use of multiple jets instead of single jets has a positive effect on the final mixing of the bed and the vertical layout of the particles affects the solid state of the solid particles in the bed mixing but this effect is not so noticeable. At the end of this simulation of the conical beds, the lower the ratio of particle diameter and density ratio of our binary particles to the substrate, the better the final mixing of the substrate over the average time
  9. Keywords:
  10. Mixing Index ; Tapered Fluidized Bed ; Discrete Particle Model (DPM) ; Inlet Jet ; Jet Nozzle ; Binary Particles

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