Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
PID temperature control algorithm design, implementation and test for coffee dryers with air flow mixing automation system
Submission Author:
Bernardo Murta , MG
Co-Authors:
Arthur Delfim, Luísa Castello Branco de Sá, Eduardo Lima II, Thiago Souza, Bernardo Murta
Presenter: Bernardo Murta
doi://10.26678/ABCM.COBEM2017.COB17-1998
Abstract
According to studies, the coffee drying process is the most crucial stage to determine the quality of the final product. The drying air temperature is the most important parameter to be analyzed in this context, because if not controlled, it can lead to several alterations in grain structure. When subjected to high temperatures, green grains acquire astringent characteristics that result in poor quality of the drink and, therefore, reduction in the market price. To avoid over-heating of the drying air, the present study aims to design, install and test an automation system for the most common existing coffee dryer category (based on wood furnace), utilizing low cost controllers and actuators, being able to control the air temperature by regulating the flow of unheated air, by mixing it to the hot air coming from the indirect wood combustion furnace, avoiding green grain overlay oxidation. For this purpose, a PID controller will be designed to optimize the drying air’s temperature by manipulating the opening of two metal hatches connected to the ventilation duct. The algorithm design, equipment installation and tests performed are further detailed in this work. Results revealed nice applicability for the system and it was able to accomplish the main objective of avoiding drying air overheating, in a way to enhance the final product quality.
Keywords
automation, Temperature, coffee, PID, Drying process
