Abstract
Double-cyclone in fluidized bed drying is an important equipment which reflects the conditions of drying in HDPE slurry process. Cyclone is an important unite of fluidized bed drying in order to move the solid particles outward to its wall. Therefore, flow pattern created in fluidized bed will affect industrial cyclones installed in dryer for dust removing. Pressure drop of the cyclones is an effective parameter represents the drying behavior. Substantially, geometry of cyclone, inlet flow rate of gas, density and particle size distribution (PSD) can affect the pressure drop value. Fluidized bed hydrodynamic regime is very complex and must be understood to improve fluidized bed operations through theoretical, industrial and CFD study of double-cyclone. Pressure drop is introduced as parameter related to the cyclone efficiency can be calculated with ANSYS Fluent software in the Eulerian-Lagrangian framework with RNG k-ɛ turbulence model used as a mathematical method. Proper pressure drop concluded from industrial experiments and CFD calculation shows good fluidization of HDPE particles in the bed of nitrogen and powder to reach the best fluidized bed situation and suitable quality of HDPE powdery product.
Highlights
HDPE Particles of fluid bed drying in the gas entering double-cyclone are subjected to centrifugal forces which move them radially outwards, against the inward flow of gas and towards the inside surface of the cyclone on which the solids separate [1]
According to the theoretical-experimental analysis of double-cyclone in HDPE fluid bed drying, it is obvious that pressure drop in cyclone is in association with gas velocity, particle density, particle size distribution and all results achieved from industrial experiments are in good agreement with theoretical concept of pressure losses happened in cyclone
Double-cyclone as a separation device is an essential equipment of HDPE fluidized bed drying
Summary
HDPE Particles of fluid bed drying in the gas entering double-cyclone are subjected to centrifugal forces which move them radially outwards, against the inward flow of gas and towards the inside surface of the cyclone on which the solids separate [1]. The static pressure measurement becomes complicated and difficult because of strong swirling flow at the outlet pipe leading to use CFD simulation of cyclone to validate the calculated data with industrial-experimental pressure drop in double- cyclone. We determined the pressure drop deference versus the volumetric gas flow rate at the operating temperature, pressure, wet polymeric feed rate, particle size distribution and density. The finite volume method has been used to discretize the partial differential equations of the model using the PISO algorithm performs two additional corrections: neighbour correction and skewness correction for improving the efficiency of numerical simulation by repeating calculation until the balance is satisfied [20, 21] This method is used for pressure-velocity coupling and the scheme to interpolate the variables on the surface of the control volume in cyclone section. The values for turbulence intensity and length scale are critical and carefully assigned for inlet boundary conditions
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
