Simple Granulation Example

Simple Granulation Example

© 2013 2010 Aspen Technology, Inc. All rights reserved

Building a Granulator  The goal of this exercise is to build a simple granulator model, run it, and review the results.  The completed model we show here is SimpleGranulationExample

© 2013 Aspen Technology, Inc. All rights reserved

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New Simulation  Open Aspen Plus and click New…

 Choose Blank Simulation


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Components  You will start out in the Properties Environment  Open the Components form on the Navigation Pane and enter Urea

 Change the Component ID to UREA-S and the Type to Solid  Click the next button

in the Run group on the Home tab


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Base Method  Select an appropriate base method. The simple example uses Ideal


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Flow Sheet  Enter the Simulation Environment and build the flow sheet below  You can find all of the necessary unit operations on the Solids tab on the model palette


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Stream Class  In Setup>Solids set the stream class to MIXCIPSD


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PSD Mesh  In Setup>Solids>PSD, define the PSD mesh as Equidistant, 200 intervals, 0-2 mm


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Streams MELT

 Define the MELT stream on the Mixed tab (because it is a fluid stream) ‒ Flash Type: Temperature, Pressure ‒ Temperature: 130 C ‒ Pressure: 3 bar

‒ Total flow basis: Mass ‒ Total flow rate: 5 kg/sec ‒ Composition: Mass-frac, Urea-S = 1


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Streams RECYCLE

 Define RECYCLE on the CI Solid tab (because it is a solid stream) – – – – – –

Substream name: CIPSD Temperature: 90 C Pressure: 1 bar Total flow basis: Mass Total flow rate: 1.2 kg/sec Composition: Mass-frac, Urea-S = 1 – Particle Size Distribution:    

Populate using: A distribution function Type of distribution function: RSSB Dispersion parameter: 4 D63: 0.9 mm


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Model Parameters Granulator

 Define GRANULAT - Specifications – Method: Particle growth by granulation – Cumulative bed mass: 600 kg – Calculation model: Mixed – Growth model: Surface proportional – Growth rate adjustment factor: 1


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Model Parameters Granulator

 Define GRANULAT – Outlet Flash – Temperature: 90 C – Valid phases: Vapor-Liquid


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Model Parameters Screen

 Define SCREEN  Deck 1

 Deck 2

– – – – – – –

– – – – – – –

Over size stream ID: COARSE Selection function: Plitt Cut size: 1 mm Separation sharpness: 8 Offset of Fines: 0 Entrainment specification: Coarse-split Entrainment fraction: 0

Over size stream ID: PRODUCT Selection function: Plitt Cut size: 0.25 mm Separation sharpness: 8 Offset of Fines: 0 Entrainment specification: Coarse-split Entrainment fraction: 0


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Define Model Parameters Crusher

 Define CRUSHER – Specifications – Outlet PSD calculation method: Determine outlet PSD from comminution power and a distribution function – Distribution function: Rosin Rammlet Sperling Bennet – Power specification: 2 kW – Select parameter(s): RRSB dispersion parameter – RRSB dispersion parameter: 3


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Define Model Parameters Crusher

 Define CRUSHER – Specifications – Comminution law: Bond’s Law – Bond work index: 8 kWhr/ton


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Run Simulation  Run the simulation


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Results

GRANULATOR  To review the results for GRANULAT, open Blocks>GRANULAT>Results  While the results form is active, click on the PSD button in the Plot group on the Home tab to generate a PSD plot


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Results SCREEN

 Blocks>SCREEN>Results


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Results SCREEN


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Results SCREEN

 Plot the Separation Efficiency (on the Separation Efficiency tab of the SCREEN – Results form)


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Results CRUSHER

 Blocks>CRUSHER>Results


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Simple Granulation Example

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