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Numerical Simulation on Superheated Steam Fluidized Bed Drying at Different Operating Pressures

  • Xiao Zhifeng EMAIL logo , Zhang Fan , Xu Lei , Wang Jianhong and Wu Nanxing
Published/Copyright: September 22, 2017

Abstract

During superheated steam fluidized bed drying process, the operating pressure has an important influence on heat and mass transfer characteristics and the vapor-solid two-phase flow characteristics. Based on the two-dimensional unsteady model of rapeseeds drying process, the influence of operating pressure on the superheated steam fluidized bed drying kinetics was revealed by computer numerical simulation. The quantitative analysis of relationship between operating pressure and maximum drying rate was conducted under negative pressure, near atmospheric pressure and high pressure environment, respectively. The optimum operating pressure values for superheated steam fluidized bed drying were obtained with the imported superheated steam temperature and superficial velocity. The simulation results provide a theoretical reference for superheated steam fluidized bed drying technology applying to agro-processing projects.

Nomenclature

a

The volume fraction of per phase

c

The steam condensation period

Deff

Effective diffusion coefficient of moisture in particle, m2/s

h

The convective heat-transfer coefficient, W/(m3∙K)

H

The specific enthalpy of per phase, kJ/kg3

Hevp

Latent heat of evaporation of water, kJ/kg3

m˙sv

The mass transfer rate between steam and particles, mg/kg3

P

Operating pressure in drying chamber, Pa

Qsv

The heat transfer rate between steam and particles, kW

s

The solid phase

u

The velocity vector of per phase, m/s

uvs

The relative velocity of two phases, m/s

uvr

Axial component of the velocity vector uv of vapor phase in the cylindrical coordinate system, m/s

uvz

Radial component of the velocity vector uv of vapor phase in the cylindrical coordinate system, m/s

usr

Axial component of the velocity vector us of solid phase in the cylindrical coordinate system, m/s

usz

Radial component of the velocit vector us of solid phase in the cylindrical coordinate system, m/s

v

The vapor phase

ρ

The density of the per phase, kg/m3

Acknowledgments

This study was financially supported by National Natural Science Foundation of China (Grant No.51306083 and 51365018).

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Published Online: 2017-9-22

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