Dynamic Centrifuge Example Project

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Dynamic Sugar Centrifuge Example Project

Note: This example requires the Sugar Add-on Species Properties Model

Project Location

..\SysCADXXX\ExamplesDynamic\Sugar Centrifuge Example.spf

available from Build 139.35250

Features Demonstrated

1. How to set up batch operation using cycle times and use of a state machine using a General Controller.
2. Scheduling multiple units to run at staggered times.
3. Use of Sugar Species Properties Model
4. Use of Noise Controller to implement feed flow rate fluctuation over time
5. Use of PID Controller to control blender compositions and tank levels
6. Use of Dynamic Fill, Dynamic Bars and Annotation Table to visibly display some parameters on the flowsheet, for example, tank level.

Brief Project Description

This is a straightforward example illustrating how to set up and run multiple batch centrifuges with predefined cycle times.

This simulation can assist in surge, availability, and capacity studies. The user may adjust the nominal feed rate to the massecuite feed tank, may turn off or on individual centrifuges, and may make other equipment and operation parameter changes to see their impact on area performance. The GC_Project General Controller reports the average time centrifuges are spent waiting to be filled.

Project Configuration

• The flow of Massecuite to the Massecuite Feed Tank is varied by the Noise Controller using a user specified mean and standard deviation.
• During the filling stage, the batch feed of Massecuite to each train of fugals is set using the Batch Method on the Connect tab page of the Massecuite Feed Tank. The Massecuite feed is sent to the next available fugal in the train by setting the splits in the upstream Tie models using the Mass Frac split flows model.
• During the spin stage, the total flow of wash water required is set on the Connect tab page of the Wash Water Tank. The wash water flows to each fugal is set using the Mass Flow split flows model. The solids are prevented from leaving the fugal using the Block Solids Filter Method, set on the Connect tab page.
• During the Empty stage, the contents of the fugal are emptied as wet cake. Syrup water is added to the cake to control the mixture to a target Brix value.
• The Water Wash tank, Syrup Water tank and Mixer levels are controlled by PID controllers.