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Modelling and Control of a Water-Cooled Duct and Cooling System

Israelsson, Alexander and Nilsson, Daniel (2016)
Department of Automatic Control
Abstract
In this thesis a water cooled duct and the surrounding cooling system, used for cooling hot off-gas from an electric arch furnace, is modelled for simulation. The model is then used to devise control strategies to keep the cooling water temperature at a given temperature to then be able to supply power to the district heating. The model consists of the heat transfer between the off-gas, steel of the water cooled duct and the cooling water, the transport delays of the water and a heat-exchanger used for cooling the water.

The control problem is non-trivial as there are long time-delays and non-linear behavior, combined with large load disturbances caused by variations in off-gas temperature. Different control strategies of increasing... (More)
In this thesis a water cooled duct and the surrounding cooling system, used for cooling hot off-gas from an electric arch furnace, is modelled for simulation. The model is then used to devise control strategies to keep the cooling water temperature at a given temperature to then be able to supply power to the district heating. The model consists of the heat transfer between the off-gas, steel of the water cooled duct and the cooling water, the transport delays of the water and a heat-exchanger used for cooling the water.

The control problem is non-trivial as there are long time-delays and non-linear behavior, combined with large load disturbances caused by variations in off-gas temperature. Different control strategies of increasing complexity and performance are presented. The results show that a simple PID-controller is not enough and different feed-forward signals, which account for how the system behaves, are also needed. Using these additions the simulated system is controlled to a satisfactory degree. (Less)
Please use this url to cite or link to this publication:
author
Israelsson, Alexander and Nilsson, Daniel
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
report number
TFRT-6015
ISSN
0280-5316
language
English
id
8890049
date added to LUP
2016-08-31 09:30:53
date last changed
2016-08-31 09:30:53
@misc{8890049,
  abstract     = {In this thesis a water cooled duct and the surrounding cooling system, used for cooling hot off-gas from an electric arch furnace, is modelled for simulation. The model is then used to devise control strategies to keep the cooling water temperature at a given temperature to then be able to supply power to the district heating. The model consists of the heat transfer between the off-gas, steel of the water cooled duct and the cooling water, the transport delays of the water and a heat-exchanger used for cooling the water.

 The control problem is non-trivial as there are long time-delays and non-linear behavior, combined with large load disturbances caused by variations in off-gas temperature. Different control strategies of increasing complexity and performance are presented. The results show that a simple PID-controller is not enough and different feed-forward signals, which account for how the system behaves, are also needed. Using these additions the simulated system is controlled to a satisfactory degree.},
  author       = {Israelsson, Alexander and Nilsson, Daniel},
  issn         = {0280-5316},
  language     = {eng},
  note         = {Student Paper},
  title        = {Modelling and Control of a Water-Cooled Duct and Cooling System},
  year         = {2016},
}