Research On Blending Process Control Strategy In Industrial Production

Blending system is one of the most important units in many industry production processes, whether the blending process execute according to the prepared rate or not is the key point to the product's quality. Usually, a ratio control strategy is used to deal with the problem of the ratio among different kinds of materials. Ratio control is widely exist in the industry production, yet there are some deficiencies in the classical ratio control strategy, these problems have been paid attention in recent years. This thesis researches the ratio control structure, applying the predictive functional control algorithm in the ratio control structure, and the main research works are as follows:(1) An overview of the blending system control technology and raw material blending process control technology in cement industry is given.(2) Considering the characteristics of the flow control in industrial processes, the first order plus dead time (FOPDT) model is used to the simulation process. The integral separation Proportional-Integral-Differential control strategy and PFC algorithm are compared. The simulation results demonstrated the better control performance of PFC algorithm.(3) Based on analyzing the classical ratio control structure, the blend station proposed by Hagglund and the PFC algorithm are introduced to build a ratio control system with blend parameter and blend function. Simulation research on comparing the new ratio control algorithm with the classical ratio control algorithm are proposed. The simulation results prove that the new ratio control structure with PFC algorithm is effective.(4) Describing the raw material blending process control in cement industry, the technology of the raw material blending process control in cement industry is discussed, modeling and control of the raw material blending process is proposed. Based on the analysis of the development and actuality of the cement raw material blending process's control system, the blending process control system and the ratio control structure in cement industry are designed.The last part is summary and perspective.