Drying of calcium carbonate in a batch spouted bed dryer: optimization and kinetics modeling

Document Type: Research Paper

Authors

1 School of Chemical Engineering, Iran University of Science and Technology (IUST), Tehran, Iran

2 Material and Nuclear Fuel research school, Nuclear Science and Technology Research Institute, Tehran, Iran

Abstract

In the present work, the drying of calcium carbonate in a batch spouted bed dryer with inert particles has been investigated experimentally. The effect of several operating parameters including air temperature (90, 100, and 110 ˚C), air velocity (Ums, 1.2 Ums, and 1.5 Ums), and dry solid mass (5, 10, 20 g) has been studied. The Taguchi method has been applied to determine the optimal parameters and also to reduce the number of required experimental runs. It has been found that the dryer performance was affected by all parameters. It has also been found that drying with 5 g dry solid at a temperature of 100 ˚C and a velocity of 1.2 Ums leads to maximum drying efficiency. Additionally, the effect of air inlet velocity and temperature on the drying kinetics of calcium carbonate has been investigated. Several semi-theoretical models with temperature and velocity dependent parameters have been selected to estimate the drying kinetics. The performance of all fitted models was acceptable but the logarithmic model was the best model in terms of the statistical analysis.

Highlights

  • A new batch spouted bed dryer was investigated for drying calcium carbonate.
  • A new criterion has been introduced to measure the effective efficiency of the drying process.
  • The drying kinetics have been modelled using semi-theoretical approaches.

Keywords


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