Sistema de controle baseado em lógica fuzzy para regulagem de temperatura em aquecedor de óleo térmico da planta de anodo verde da Albrás

Abstract

This work presents the results of a fuzzy control strategy to regulate the temperature of the heater thermal oil, in the Anode Green process at Albrás Aluminum Brasileiro S/A factory. The use of this methodology has resulted in the system being able to react adequately against of the variations on the point of operation of the heater, because the Fuzzy control displays some characteristics of human learning. The heater thermal oil equipment is fundamental in the process of manufacture of blocks butts, used as positive pole in the process of electrolysis in the acquisition of primary aluminum. The system of thermal oil warms the mixers and pre-heating of coke, keeping the temperature of the equipment within the limits established by process engineering. The variable temperature impacts directly in the energy mix of the pulp and the quality of the final product, which is block anode. The methodology presented allowed to reach a temperature control that satisfactorily achieved the process parameters. The program was developed in language scada is executed in programmable logic controllers (PLC'S) of Rockwell Automation. The methodology presented allowed to reach a temperature control that satisfactorily achieved the process parameters. The control is already in full operation at the plants of anodes and the results obtained demonstrate the effectiveness and viability of the system, which in future will be implemented in the control of other equipment of Albras.