Fluidization Pre-oxidation And Carbonization Tar Elimination Of The Control System

In this paper, a set of computer controlling system was developed to control fluidized pre-oxidation status and eliminate carbonization tar according to the actual needs of domestic carbon fiber research based on a general view of the present situation and development tendency of computer controlling system home and abroad. Meanwhile a supervising computer software was also developed to satisfy the requirements for the controlling system.The system is a distributed controlling system which owns four main functions described as temperature monitoring and controlling, movement driving controlling, protective gas monitoring and flow volume controlling.A self-adaptive PID controlling module was used to control temperature precisely complied with advanced compound controlling strategy, which reached a controlling index of fast temperature rising speed and accurate controlling level. Servo motor system was used to adjust movement speed instead of using convential stepping motors .which is more flexible and precise with low noise. The protective gas monitoring module can reduce the production cost and improve the carbon fiber quality by monitoring the minim oxygen and water content of gas purified by corresponding apparatuses.The software achieves serial commucation by using Windows API functions and can run on Windows 98/2000/XP OS. The application of multithreading technology improves the system performance. The monitoring interface can display several varying curves of controlling parameters and has many customization functions. The data processing module and servo motor controlling module have friendly interfaces and can be operated simply. The software development adopts many mature technologies so that it is stable and reliable.The system has been put into practice according to the requirement of 863 Projects. The on field application results has shown that the system has manyproperties, such as correct design, accurate controlling, running stability, friendly software interface and perfect functions, which satisfys the designing needs.A temperature-time model of pre-oxidation furnace heating process has been induced by analyzing the experiment data. The calculated data using this model fits the experiment data well.A process simulation program was developed based on the temperature-time model.