Modelling and Control of a Water-Cooled Duct and Cooling System
(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:
http://lup.lub.lu.se/student-papers/record/8890049
- author
- Israelsson, Alexander and Nilsson, Daniel
- supervisor
- organization
- year
- 2016
- 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}},
}