Disk Centrifuge

From SysCAD Documentation

Navigation: Main Page -> Models -> Mass Separation Models

---

Contents 1 General Description 1.1 Diagram 2 Inputs and Outputs 3 Model Theory 4 Flowchart 5 Data Sections 5.1 Requirements 5.2 Results 6 Adding this Model to a Project

General Description

The Disk Centrifuge mixes perfectly all the incoming feed streams and then, based on the user configuration, calculates the amount, temperature and composition of material reporting to the products.

Diagram

The diagram shows the default drawing of the Disk Centrifuge, with all of the streams that are required for operation of the unit. The physical location of the streams connecting to the unit is unimportant. The user may connect the streams to any position on the unit.

Inputs and Outputs

Label	Input / Output	No. of Connections		Description
		Min	Max
Feed	In	1	20	The slurry feed to the Disk Centrifuge
Centrate	Out	1	1	Centrate outlet from the unit
Cake	Out	1	1	Solids outlet from the unit

Model Theory

The Disk Centrifuge is based on user defined variables that define the solids / liquids split. There are four methods available in this model:

1. SolidsRec/SolidAnalysis: User specified feed solids recovery to the centrifuge cake and cake percent solids.
2. SolidsRec/MoistAnalysis: User specified feed solids recovery to the centrifuge cake and cake moisture contents.
3. CentConc/SolidAnalAnalysis: User specified centrate solids concentration and cake percent solids.
4. CentConc/MoistAnalAnalysis: User specified centrate solids concentration and cake moisture contents.

Flowchart

The following shows the sequence of events if sub model options are switched on. See next heading for more information.

Data Sections

The default sections and variable names are described in detail in the following tables. The default Disk Centrifuge access window consists of three sections. This number may increase based on user configuration.

1. The first section, which has the same name as the Disk Centrifuge tag, contains general information relating to the unit, as well as check boxes that allow the user to enable Reactions and/or a heat loss to the environment.
2. The EHX, or Environmental Heat Exchange, tab may be visible if the user enables this functionality. This is fully described in Environmental Heat Exchanger (EHX).
3. The RB, or Reaction Block, tab may be visible if the user enables this functionality. This is fully described in Reaction Block (RB).
4. The Info section, contains general settings for the unit and allows the user to include documentation about the unit and create Hyperlinks to external documents. This is fully described in Common Data Sections.
5. Links tab, only visible in SysCAD 9.2, contains a summary table for all the input and output streams.
6. Audit tab - contains summary information required for Mass and Energy balance. See Model Examples for enthalpy calculation Examples.

Class: Cntrfuge-1 - The first tab page in the access window will have this name.

Tag / Symbol	Input / Calc	Description/Calculated Variables / Options
Common First Data Section
Requirements
Method	List box	SolidsRec/SolidAnalysis - Solids Recovery and Solids Analysis
RqdSolidsRec	Input	Required Solids Recovery - The fraction of the feed solids reporting to the cake.
RqdCakeSolids	Input	The required cake % solids.
Method	List box	SolidsRec/MoistAnalysis - Solids Recovery and Moisture Analysis
RqdSolidsRec	Input	Required Solids Recovery - The fraction of the feed solids reporting to the cake.
RqdCakeMoist	Input	Required Cake Moisture.
Method	List box	CentConc/SolidAnalysis - Centrate Concentration and Solids Analysis
RqdCentConc25	Input	The required concentration of solids in the centrate measured at 25°C.
RqdCakeSolids	Input	The required cake % solids.
Method	List box	CentConc/MoistAnalysis - Centrate Concentration and Moisture Analysis
RqdCentConc25	Input	The required concentration of solids in the centrate measured at 25°C.
RqdCakeMoist	Input	Required Cake Moisture.
Reactions	List	This can be used to switch on the Reaction Block (RB). If this is 'On' then the associated page, RB becomes visible and may be configured. Note: The user does not have to configure a reaction file, even if this block is checked.
EnvironHX	List	This can be used to switch on Environmental Heat Exchanger (EHX). If this is 'On' then the associated page, EHX may become visible and may be configured. Note: The user does not have to configure an environmental heat exchange, even if this block is checked.
OperatingP... (available in SysCAD 9.2 or later)
Method	List	Atmospheric -- outlet streams will be at Atmospheric Pressure. The atmospheric pressure is calculated by SysCAD based on the user defined elevation (default elevation is at sea level = 101.325 kPa). The elevation can be changed on the Species tab page of the Plant Model.
		LowestFeed -- outlet streams will take the lowest pressure of the feeds.
		HighestFeed -- outlet streams will take the highest pressure of the feeds.
		RequiredP -- outlet streams will be at the user specified pressure.
Result	Display	The actual pressure used for the sum of the feeds which will also be the outlet pressure (unless further model options change the pressure).
TrackStatus	Tick Box	Allows warning messages be displayed if requirements are not met.
Results
CakeSolids	Calc	Cake percent solids.
CentrateSolids	Calc	Centrate percent solids.
CakeSolConc25	Calc	The cake solids concentration measured at 25°C.
CentrateSolConc25	Calc	The centrate solids concentration measured at 25°C.

Adding this Model to a Project

Insert into Configuration file

Sort either by DLL or Group.

	DLL:	Separ1.dll	→	Units/Links	→	Separation: Disk Centrifuge(1)
OR	Group:	Mass Separation	→	Units/Links	→	Separation: Disk Centrifuge(1)

See Project Configuration for more information on adding models to the configuration file.

Insert into Project

Insert Unit

→

Separation

→

Disk Centrifuge(1)

See Insert Unit for general information on inserting units.