Based On The Prediction Of The Decomposition Rate Of Carbonation Process Fuzzy Expert Control Technologies And Applications

Continual carbonation decomposition (CCD) of sodium aluminates solutions is one of the key processes in the process of alumina production by sintering process. The control of the resolution ratio is significant for improving the output and quality of product, decreasing air pollution.Based on analysis of the mechanic theory and characteristic of CCD, the structure of control system is established and the intelligent control strategy of resolution ratio is presented. The system consists of three modules, such as optimal setting model of resolution ratio, intelligent prediction model of resolution ratio and fuzzy expert control model of resolution ratio.Based on neural network and expert system, the intelligent prediction model of resolution ratio is developed, which consists of five modules, such as data collection and pretreatment, decision-making support, prediction, on-line modification and effect estimate. It has applied in the prediction of resolution ratio, which is hard to get timely. It has proved that the prediction model solves the problem of the measurement difficulty of the key variables to a great extent. It also provides good foundation for optimal control of the system.Combining fuzzy control and expert system, the fuzzy expert control model of resolution ratio is used for optimal control of resolution ratio. The control model has three loops, which are inlet amount loop, dioxide carbon flow loop of 4~# tank and dioxide carbon flow loop of 5~# tank. According to the variation in liquid level of gravity-feed tank, expert control strategy is used to adjust the inlet valve opening to ensure the steady inlet amount. At the same time, according to the error between target and prediction, fuzzy-expert control strategy is used to adjust dioxide carbon valve opening to ensure the proper resolution ratio.The intelligent control based on fuzzy-expert strategy is used in the CCD process in Zhongzhou Aluminum Company. The validityof this strategy is proved by the running results. The software is stable and reliable; the resolution ratio is control effectively and the output and quality of product are improved.