Tham khảo tài liệu 'advanced model predictive control part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Model Predictive Control Strategies for Batch Sugar Crystallization Process 229 Stage Action Control Charge The steam valve is closed and the stirrer is off. The vacuum pressure changes from 1 to bar. The vacuum pressure reaches bar feeding starts with max rate. Liquor covers 40 of the vessel height. No control The feed valve is completely open Concentration The vacuum pressure stabilizes around bar. The stirrer is on. The volume is kept constant. The steam flowrate increases to 2 kg s The supersaturation reaches the feeding is closed the steam flowrate is reduced to kg s Control loop 1 Controlled variable Volume Manipulated variable liquor feed flowrate Seeding and setting the grain The supersaturation reaches . Seed crystals are introduced. The steam flowrate is kept at the minimum for two minutes. No control The feed valve is closed Crystallization with liquor phase 1 The steam flowrate is kept around kg s. The supersaturation is controlled at the set point . Control loop 2 Controlled variable supersaturation Manipulated variable liquor feed flowrate Crystallization with liquor phase 2 The volume of crystallizer reaches 22 m3. The feed valve is closed. The supersaturation is controlled at the set point . The stirrer power reaches A. Control loop 3 Controlled variable supersaturation Manipulated variable steam flowrate Crystallization with syrup The steam flowrate is kept around the maximum of kg s. hard constraint . The volume fraction of crystals is kept at the set point . The volume reaches its maximum value 30 m3 The feed valve is close. Control loop 4 Controlled variable volume fraction of crystals. Manipulated variable syrup feed flowrate Tightening The stirrer power reaches the maximum value of 50 A hard constraint . The steam valve is closed. The stirrer and the barometric condenser are stopped. No control Table 1. Summary of the sugar crystallization operation strategy. 230 Advanced Model Predictive .
