Alumina Carbonation To Resolve The Process Of The Decomposition Rate Of The Expert Control System

The process of the continuous carbonation decomposition (PCCD) is the key procedure in the sandy alumina production, and the resolution ratio gradient and the last resolution ratio directly affect the product quality. Aimed at the existing condition of the PCCD and the factors to quality and quantity of the riopone product in the Zhongzhou Aluminum Group Company, a resolution expert control system of the PCCD is developed to realize the automatic control of the resolution ratio. The system has been in operation in July, 2004. The practical running results indicate that not only the qualified rate of the resolution ratio reaches 98%, and the qualified rate of Silicon reaches 95.2%, but also the product quality and quantity are improved. The following are the main jobs and the research findings in the paper.1. In order to ensure the optimal resolution ratio gradient and the last resolution ratio, it is necessary to adjust the feed flow and the aeration amount of the dioxide carbon in the forth and fifth decomposers in view of the mechanics of the continuous carbonation decomposition and the factors to the qualified riopone product.2. Taking into account the factors to the resolution ratio gradient, a resolution ratio expert controller is described, where the knowledge is represented in the form of the production rule, and the inference engine adopts the Forward chaining and Depth-first search.3. A self-adapting prediction model for the last resolution ratio is established. The model forecasts the next last resolution ratio by the method of linear regression. The output of the expert controller can be feedforward compensated by the next last resolution ratio.4. With Visual C++, an optimizing control system software for the PCCD is explored, which implements the functions such as the technological parameters monitoring, auto-control on the feed flow and the aeration amount, and on-line fault diagnosis and warning.