Modelagem, desenvolvimento e análise de um sistema gerador de ozônio, operando em alta frequência com controlador digital de sinais

Abstract

Currently ozone has been studied for appiications in water treatment, treatment of domestic and industrial effluents, in medicine, dentistry, veterinary medicine, agricuiture, disinfectiori of environments, food preservation and others. Ozone can be produced in three main ways: by eiectroiysis, UV (ultraviolet) and corona discharge. Most ozone generators based on the corona discharge, based on this work, consist of conventional power sources operating at 10w frequeny, which have lowincomes, are robust and have no control system, thus refleting ali variations of input on its output, and does not compensate for ioad variations, causing instability in the production of ozone. In these generators, ozone production is fix and where necessary a variation, the flow of feed gas should be changed, noting that the power consumed by the generator remains the sarne. Thus, the present work consists of a large project involving the areas of modeling, control and process automation, power electronics and chemical processes, leading to the final implementation of the power board, control anaiog, digital and reactor the ozone generator system, based on the principie of corona discharge. The generator developed ailows applications in oxidative processes in general, the sarne being designed and implernented in closed Ioop with proportional and integral (P1) action, anaiog control and digital using DSC (Digital Signal Controilér), for performance comparison. The power stage consists of two switched converters in high frequency, a buck converter and a flyback converter. By means of the technology the power supplies in high frequency, is possible to vary the production of ozone generated by acting directly on the control signal the converters, thereby varying the electrical power consumption proportionally the production of ozone required, providing an economy of energy. Are presented the power stage, the anaiog control in closed-Ioop, digital control and the reactor developed, the implementation of ali functions, protections and signaiing for system, that controis the generator so analog and digital. The experimental resuits of operation and suggestions for applications, were obtained from the prototype impiemented, experimentaily confirming the functionality of the developed technique, being a viabie alternative for applications in oxidative processes.