Simulation and scale-up of pneumatic conveying and cascading rotary dryers

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Drying Technology

DOI:https://doi.org/10.1080/07373939708917319· OSTI ID:533023

Kemp, I C; Oakley, D E ^[1]

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1. AEA Technology, Didcot (United Kingdom). Harwell Lab.

This paper presents a unified model for simulation of cocurrent and countercurrent dispersion-type dryers. The main industrial applications are to pneumatic conveying (flash) dryers and cascading (direct) rotary dryers. The basic model is a one-dimensional incremental (stepwise) simulation, which has been developed over a number of years. Equations for particle motion, heat and mass transfer, heat and mass balances and local gas conditions are solved simultaneously over a small increment along the dryer. All workers have previously had considerable difficulty in obtaining a good fit between simulations and actual results from pilot plants or large-scale industrial dryers. A new fitting model calculation overcomes this by identifying the parameters which need to be adjusted, concentrating on those which cannot be measured accurately. Excellent agreement has been obtained between the model and experimental data by this method. The paper also presents revised formulations for particle motion and heat transfer in rotary dryers. The model has been incorporated into two computer programs for flash and rotary dryers respectively, and results from the former are shown for a case study.

• Sponsoring Organization: USDOE
• OSTI ID: 533023
• Report Number(s): CONF-9607189--
• Journal Information: Drying Technology, Journal Name: Drying Technology Journal Issue: 6-8 Vol. 15; ISSN DRTEDQ; ISSN 0737-3937
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
COMPUTERIZED SIMULATION
CONVEYORS
DRYERS
HEAT TRANSFER
MATERIAL BALANCE
MATHEMATICAL MODELS
ONE-DIMENSIONAL CALCULATIONS
PNEUMATIC TRANSPORT
SOLIDS FLOW