SPBEDRTD - Spouted Bed Reactor Mixing Model

A stirred-tank model has been proposed, (Daly, 1980), to model the mixing behavior of an air-solid, spouted, fluidised-bed reactor. The central spout is modelled as two tanks in series, the top fountain as a further tank and the down flowing annular region of the bed as 6 equal tanks in series. It is assumed that a constant fraction of the total solids returns from each stage of the annular region into the central two tank region, as depicted below. 

Experimental residence time studies are to be carried out in which the solid in the bottom half of the bed is initially mixed with tracer, the bed started and timed samples taken from various locations in the bed annular region. It is desired to model the resulting tracer distribution in the bed in order to find the fraetional slippage rate between the annular tanks and the central bed regions. 

The initial expansion of the bed consequent to the start of the air flow is neglected from the analysis. 

Component balance equations for each region of the reactor are given. 

CONSTANT V3=0.05 CONSTANT F0=1,P=0.05 CONSTANT Vt ot = 1.8 CONSTANT CSTART=1 CONSTANT TFIN=5,CINT=0.1 1 SIM INTERACT RESET GOTO 1 INITIAL 

5 Simulation Tools and Examples of Chemical Engineering Processes 

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SPBEDRTD - Spouted Bed Reactor Mixing Model System... 

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