ETip: Controlling Concentration using Makeup Blocks

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Related Links: Makeup Block (MU), Makeup Source, Adding Makeup to a Unit

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Introduction

Makeup Blocks can be used as a quick and efficient means to control species or elemental concentration, instead of using a PID or General Controller.

Why

Using a Makeup Block to control the concentration of a species or element in a unit is quick and easy to configure and will improve solution convergence and speed.

How

To configure elemental concentration control in a unit using a Makeup Block:

• Add a Makeup Source to the flowsheet with the required species composition.
• Add a Makeup Block to the required unit, refer to 'Adding a Makeup Block to a Unit'.
• Select up the required Makeup Source.
• Select Model = 'Product Concentration'.
• For 'Product Mass Measurement' select 'Element'.
• Choose the required element from the drop down list.
• Select 'Product Volume Measurement' = 'Phase'.
• Tick 'Liquids'.
• Enter the required product concentration.

Did you know

• The user only needs to add and configure a single Makeup Source to feed many different units in a project.
• Since the Source is not connected to the Makeup Blocks with a standard links, there is no need for multiple links to be constructed.

Example

The pictures below show an example of using water addition to dilute the Nickel concentration to 75 g/L.