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Modelling and Control of an Evaporation Process

Davidsson, Emil and Hedenberg, Hampus (2015)
Department of Automatic Control
Abstract
Model-based design is in many ways seen as a potential instrument in process industries due to the close link between the process and the model. In Växjö, the process industry of Lantmännen Reppe AB produces syrup. The syrup goes through an evaporation process in order to raise the sugar concentration. If the concentration gets to high the syrup turns solid, which can make the process a bit tricky to control.

In this master’s thesis the goal is to model this process in the MathWorks environment Simulink in order to gain understandings about different aspects of the process and eventually bring forward and evaluate different control strategies. Information about the real process has been obtained by visits at the factory and mail... (More)
Model-based design is in many ways seen as a potential instrument in process industries due to the close link between the process and the model. In Växjö, the process industry of Lantmännen Reppe AB produces syrup. The syrup goes through an evaporation process in order to raise the sugar concentration. If the concentration gets to high the syrup turns solid, which can make the process a bit tricky to control.

In this master’s thesis the goal is to model this process in the MathWorks environment Simulink in order to gain understandings about different aspects of the process and eventually bring forward and evaluate different control strategies. Information about the real process has been obtained by visits at the factory and mail correspondence with the process engineer of the plant. Important advices along the project have been given by supervisors at the Department of Automatic Control and at Combine Control Systems AB.

The modelling is founded on approximations regarding no temperature or pressure dependencies, but only mass and energy balances. The model has been adjusted and tuned along the project in order to match the given process dynamics. The model verification has been conducted by comparisons of model simulations and process data. The model has in many ways proven to capture the fundamental behaviors of the process.

A number of different control strategies have been tested in the model and the results have been compared. It has been shown that the present feed forward controller improves the system control but also that new feed forward controllers and a new sensor can improve the system control furthermore. The greatest improvements have been seen when introducing an additional sensor in the model. (Less)
Please use this url to cite or link to this publication:
author
Davidsson, Emil and Hedenberg, Hampus
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
ISSN
0280-5316
other publication id
ISRN LUTFD2/TFRT--5977--SE
language
English
id
7471261
date added to LUP
2015-07-03 09:24:57
date last changed
2015-07-03 09:24:57
@misc{7471261,
  abstract     = {Model-based design is in many ways seen as a potential instrument in process industries due to the close link between the process and the model. In Växjö, the process industry of Lantmännen Reppe AB produces syrup. The syrup goes through an evaporation process in order to raise the sugar concentration. If the concentration gets to high the syrup turns solid, which can make the process a bit tricky to control.

 In this master’s thesis the goal is to model this process in the MathWorks environment Simulink in order to gain understandings about different aspects of the process and eventually bring forward and evaluate different control strategies. Information about the real process has been obtained by visits at the factory and mail correspondence with the process engineer of the plant. Important advices along the project have been given by supervisors at the Department of Automatic Control and at Combine Control Systems AB.

 The modelling is founded on approximations regarding no temperature or pressure dependencies, but only mass and energy balances. The model has been adjusted and tuned along the project in order to match the given process dynamics. The model verification has been conducted by comparisons of model simulations and process data. The model has in many ways proven to capture the fundamental behaviors of the process.

 A number of different control strategies have been tested in the model and the results have been compared. It has been shown that the present feed forward controller improves the system control but also that new feed forward controllers and a new sensor can improve the system control furthermore. The greatest improvements have been seen when introducing an additional sensor in the model.},
  author       = {Davidsson, Emil and Hedenberg, Hampus},
  issn         = {0280-5316},
  language     = {eng},
  note         = {Student Paper},
  title        = {Modelling and Control of an Evaporation Process},
  year         = {2015},
}