Implementación de un sistema de control en lazo cerrado para el control de temperatura en un horno industrial de fundición de aluminio.

Abstract

The aim of this graduate research project was to implement a closed-loop control system for temperature control in an industrial aluminum smelting furnace for the FUNDYMEC Company. An on-off type control programmed in a Programmable Logic Controller (PLC) was developed, for which it was necessary to implement an electric arc ignition system, a human-machine interface (HMI) was designed, interacting with the system in two ways: in both manual and an automatic mode, a new system for diesel fuel injection was also implemented. It is described the devices used and installed in a control board designed in AutoCAD Electrical. The control system operation tests were successful, both in manual and automatic mode, establishing communication between the PLC and the HMI screen and allowing the user to interact with the system. The control system maintains the temperature at the desired value; as it is on-off control, the temperature graph presented an oscillation whose average value is not significantly different from the established value by the user, as demonstrated by the images obtained. In the HMI and the T-Student statistical analysis, thirty temperature samples were taken at time intervals. To carry out temperature control in metal smelting processes is recommended firstly to carry out a study on the element that acts as fuel since several types of energy are used for smelting.