Simple Granulation Example
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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
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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
– – – – – – –
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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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