The fluidization in the furnace of circulating fluidized bed (CFB) boilers is described. Data have been obtained from a 12 MWth CFB boiler and literature. bottom bubbling rather than fast or turbulently as often assumed. There an extended splash zone above this bed, which particles are thrown up by bubbles fall back onto bed. Other carried further into transport zone, initially saturated gas fl...

Abstract Removal of C 2 H 4 in the air was carried out continuous flow reactor with photocatalytic bed (expanded polystyrene spheres coated by TiO or SiO /TiO ) under irradiation UV light. Continuous a gas stream through realised at static and fluidization. The required for fluidisation 500–700 ml/min, whereas rate 20 ml/min used. Fluidized appeared to be much more efficient ethylene removal th...

Comparative analysis of the steady-state and transient properties a bubbling fluidized-bed catalytic reactor obtained according to different mathematical models emulsion zone was performed verify commonly used assumption regarding pseudohomogeneous nature this zone. Four dynamics were formulated, based on thermal diffusional conditions at gas-solid interface within catalyst pellet, namely model...

Liquid fluidization of mixtures solid particles spherical and cylindrical shape has been numerically simulated. The simulations explicitly resolve the solid–liquid interfaces by means an immersed boundary method implemented in a lattice-Boltzmann flow solver. A soft collision algorithm deals with particle–particle contacts close-range hydrodynamic interaction. systems studied have overall solid...

The physical parameters of two products widely used in the confectionery industry – peanuts and cocoa beans have been studied. hydrodynamic characteristics these products, influencing fluidized bed roasting regime, determined. hydrodynamics a rotating-pulsed fluidization cited materials has examined. Dependences are derived for calculating pressure drops initial velocity particles during creati...

In the computational fluid dynamics (CFD) modeling of gas-solids two phase flow, the effect of boundary conditions play an important role in predicting the hydrodynamic characteristics of fluidized beds. In this work, the hydrodynamics of conical fluidized bed containing dried TiO2 nano-agglomerates were studied both experimentally and computationally. The pressure drop ...

Soft-sphere discrete element method (DEM) and Navier-Stokes equations were coupled with equations of energy for gas and solids to investigate the process of agglomeration in fluidized bed of polyethylene particles at high temperature. The Newton’s second law of motion was adapted for translational and rotational motion of particles and agglomerates. The cohesive force for polyethylene particles...

In this paper, a unified gas-kinetic wave-particle scheme (UGKWP) for the disperse dilute gas-particle multiphase flow is proposed. The gas phase always in hydrodynamic regime. However, particle covers different regimes from trajectory crossing to wave interaction with variation of local Knudsen number. UGKWP an appropriate method capturing multiscale transport mechanism through its coupled for...