Zinc Oxide Whisker Production Process Automatic Control System Design And Application

Zinc oxide whiskers production process is a more complex process. As a result of relying on artificial experience and lacking of scientific guidance in the practical operation, and then the gas parameters accessed to the oxidation furnace are unstable. So, the product quality of zinc oxide whiskers is low. Therefore,' developing automatic control system and using the advanced control technology to the zinc oxide whiskers production process have a very important significance to enhance the stability of parameters, improve the product quality of the zinc oxide whiskers and realize integrated automation of the production process.Zinc oxide whiskers production process is considered as the research object in the paper. After analyzing the relationships between gas parameters aceessed to the oxidation furnace and the whiskers quality, the gas distribution control system is researched and designed according tothe request of the main factors------the oxygen content and the gas flux.At first, the paper proposes a framework for the structure of the control system, and summarized its features; The actual gas distribution system has delay, coupling, external uncertainty and interference factors, then, according to such factors and the dynamic characteristic of control system, the mathematic model of the control system is established, and the feedforward decoupling control algorithm and incremental PID control algorithm are used to design the corresponding controller. Finally, the monitoring software is developed, and the operation result is given.System monitoring software is realized by configuration software EasyBuilder and Siemens PLC S7-300 STEP7. Parameters surveillance, oxygen content and gas flux are controlled stably and alarm functions of the gas distribution control system are realized. The actual operating results demonstrated high reliability and practicality.