Electrical arc furnaces are used in steel production. They work on a principle called the electrical arc. Electrical arc is the visible plasma that is created in an ionized gas, which is ionized with the help of an electric current. During this process a lot of heat is released, which is used to melt metals. As a result, the electrical arc furnaces can reach a temperature of 1800 °C. This is way we must provide appropriate cooling. We must be careful at choosing the right sensors because we are dealing with very high temperatures.
The diploma thesis describes the making process of developing a measuring system for measuring temperature and flow of the cooling liquid, that is located in the electrical arc furnace wall. The project was made with Siemens program TIA Portal, which is used to program logical controllers and for developing human machine interface.
In the theoretical part of the diploma thesis is a short description of the electrical arc furnace, the cooling system of the electrical arc furnace, the making process of steel, and the requirements and objectives of the project are presented. The building block of the measuring system and the tools for creating the project are described. The main part of diploma thesis is describing the whole programing process of the programable logical controller and graphic display.
The main goals of the diploma thesis are: to describe the basic operations of the electric arc furnace, to create a system for measuring cooling water temperatures and to make an effective graphic representation of the cooling water temperatures.
I had free hands when it comes to designing the program for the programable logical controller and the design of the graphical display. I could focus on creating an effective graphical display. At the end of the project all the set goals were met.
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