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Currently in petrochemical refineries and gas processing, distillation tower is one of the most important processing steps in the decision process technology to product quality and performance of the plant. Distillation tower structure and operating principle general agreement with most of the physical and chemical techniques. On the other hand the quality of plant products are determined primarily by the quality control and process stability reliability of the tower. However, maintaining continuous working time and stability in harsh working conditions of the tower is very difficult. Characteristics of the tower is a nonlinear control subjects with a lot of noise parametric oscillation with high amplitude and the interaction with each other. In such conditions the control system must have the following tasks need to stabilize the working parameters of the tower in the work allowed limit. It is also an important task in the stable product quality, prevent unfortunate incidents can happen to the tower. According to the most dangerous incidents that may occur is the phenomenon of flooding in distillation towers.
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