Change Sieve Series

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General Description

The Change Sieve Series model is required when a different size distribution (or sieve series) is to be used. This is particularly important when adding streams with different sieve series, as only streams with the same sieve series can be added. Therefore, before the streams can be mixed properly, the change sieve series model must be put in place.

To see more information on size distributions, please see Size Distribution (PSD).

Diagram

The diagram shows two streams using different sieve series mixing. A Change Sieve Series model is used to change the Coarse Sieve series to Fine Sieve Series before the mixing can correctly occur.

Inputs and Outputs

Label	Required Optional	Input Output	Number of Connections		Description
			Min	Max
Input	Required	In	1	1	Input stream to Change Sieve Series.
Output	Required	Out	1	1	Output stream from Change Sieve Series.

Model Theory

To convert from sieve series A to sieve series B:

• For size interval in sieve series A the Sieve Changing model converts the % passing data to the Rosin-Rammler variable;
• The model then performs an interpolation to obtain the required Rosin-Rammler variable at the required size interval in sieve series B;
• This is then converted to % passing for sieve series B.

Data Sections

The default sections and variable names are described in detail in the following table.

Unit Type: SzChng - The first tab page in the access window will have this name.

Tag (Long/Short)	Input / Calc	Description/Calculated Variables / Options
Tag	Display	This name tag may be modified with the change tag option.
Condition	Display	OK if no errors/warnings, otherwise lists errors/warnings.
ConditionCount	Display	The current number of errors/warnings. If condition is OK, returns 0.
GeneralDescription / GenDesc	Display	This is an automatically generated description for the unit. If the user has entered text in the 'EqpDesc' field on the Info tab (see below), this will be displayed here. If this field is blank, then SysCAD will display the UnitType or SubClass.
On	Tick Box	Toggle the sieve changing operation on/off.
SizeDefn	List Box	Lists all the available sieve series
Results
MassFlow / Qm	Calc	The Mass flow in the sieve changing module.
SolidMassFlow / SQm	Calc	The Solid Mass flow in the sieve changing module.
Feed.Distribution	Calc	The name of the feed size distribution entering the sieve changing module.
Feed.NIntervals	Calc	The number of size intervals of the feed size distribution.
Prod.Distribution	Calc	The name of the feed size distribution leaving the sieve changing module.
Prod.NIntervals	Calc	The number of size intervals of the product size distribution.

Adding this Model to a Project

Add to Configuration File

Sort either by DLL or Group:

	DLL:	Comminution.dll	→	Units/Links	→	Size Alteration: Change Sieve Series
or	Group:	Size Distribution	→	Units/Links	→	Size Alteration: Change Sieve Series

See Model Selection for more information on adding models to the configuration file.

Insert into Project Flowsheet

Insert Unit

→

Size Alteration

→

Change Sieve Series

See Insert Unit for general information on inserting units.