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Entry type: Application example Entry ID: 48418663, Entry date: 05/18/2018
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PCS 7 Unit Template "Distillation Column" using the example of the Chemical Industry

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  • Associated product(s)
The "Distillation Column" unit template is based on a standardized and structured design of the automation program through the use of predefined equipment and the control modules. The example is used both as a basis for projects and as an overall standardization template.

The standardization of automation engineering for processing plants, such as in the chemical industry, is a major challenge. Different process steps and procedures, different equipment and flexibility in the production make the task even more difficult. This includes the plant structure according to the ISA-106. This specifies the lower four levels, i.e. plant area, unit, equipment and device. A plant area always consists of units. The units contain standardized equipment modules.

The example contains all typical components of a distillation column, its control, the required logic and the visualization. The application program was created using the APL (Advanced Process Library), which also contains a model predictive multi-variable controller. The multi-variable controller is the core component of the control strategy; it takes on the control of head and bottom temperature in the distillation column. Further controls are subordinate to the multi-variable controller.

Its utilization offers the following advantages:

  • A reduction of the knowledge necessary to develop applications
  • A decrease in the configuration effort
  • More flexible setup and adaptation due to equipment modules
  • Standardized structures
 


A distillation column as part of a process plant

Main contents
The following main points are explained in this application:

  • Structure of process tag charts
  • Configuration of the PID controllers
  • Configuration of the MPC controller
  • Modifying a disturbance variable (feed volume / feed concentration) and compensation through the MPC controller
  • Structure and application of the simulation
  • Task-related overview screens with APG (PCS 7 V8.1 sample project)

Delimitation
The following exceptional cases are not covered by this application:

  • Multi-substance distillation, i.e. columns with additional lateral extractions
  • Columns with gaseous head products, which require a different structure for the pressure control
  • Vacuum columns with a special pressure control structure
  • Stripper, i.e. columns without reinforcement part
  • Columns with no representative temperature as controlled variable

Validity
SIMATIC PCS 7 PCS 7 V9.0, PCS 7 V8.1 SP1, PCS 7 V8.0 SP1 and V7.1 SP1

Documentation and Sample Project for PCS 7 V9.0
  Documentation (4,1 MB)

You can download the example project for PCS 7 V9.0 in the Extranet-section of this entry. This Extranet section is only visible if have concluded a Managed System Services contract. Refer to the following link for detailed information: Managed System Services.

Documentation and Sample Project for PCS 7 V8.1 SP1
  Documentation (2,4 MB)
 Registrierung notwendig  PCS 7 V8.1 SP1 sample project with APG (227,2 MB)

Documentation and Sample Projects for PCS 7 V8.0 SP1 and PCS 7 V7.1 SP1
  Documentation (7,2 MB)
 Registrierung notwendig  PCS 7 V8.0 SP1 sample project (132,2 MB)
 Registrierung notwendig  PCS 7 V7.1 SP1 sample project (72,4 MB) 

Further Information
Equipment Modules for PCS 7 using the example of the Chemical Industry
PCS 7 Unit Template "Polymerization Reactor" using the example of the Chemical Industry
PCS 7 Unit Template “Stirred Tank Reactor” using the example of the Chemical Industry
PCS 7 Unit Template “Fermenter” using the example of the Chemical Industry
PCS 7 Unit Template “Dryer” using the example of the Chemical Industry
Integration of Advanced Process Graphics in SIMATIC PCS 7
Simulation of a PCS 7 stirred tank reactor with SIMIT Simulation Framework
Service Contracts - SIMATIC PCS 7 Lifecycle Services
Managed System Services overview page 

Last change
New project for PCS 7 V9.0 with Integration of Smart Alarm Hiding

Additional Keywords
Distillation Columns,  Unit Templates, chemical plants, projecting examples, rectification column, destillation

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