Multivariable Control Stirred Tank

Multivariable Control: Stirred Tank A pump transports the reactant out of a collecting tank via a heat exchanger into the stirred tank. The reactant is pre-heated by the heat exchanger. A heater in the double jacket permits control of the temperature in the stirred tank. Another pump transports the heated product out of the stirred tank via the heat exchanger back into the collecting tank. A bypass in the inlet routes the flow past the heat exchanger. A three-way motorised valve adjusts the ratio between the flow heated in the heat exchanger and the flow in the bypass. This is a further method of controlling the temperature in the stirred tank. A control valve changes the flow rate in the outlet and thus the level in the stirred tank. The temperature and level are mutually dependent variables. It is this dependence that makes this multivariable control system so complex. Coupled level and temperature control in one stirred tank Circuit with stirred tank, collecting tank and pump Heat recovery with heat exchanger Stirred tank with double jacket and heater; level display for tank and jacket Temperature control with heater and 3-way motorised valve as actuators Level control with pneumatic control valve as actuator Temperature controller and level controller configurable and parameterisable with software 2-point controller for constant temperature in collecting tank via external cooling water Optional process control software via Profibus DP interface including PC1 Computer-System with 21" TFT-Monitor Win 10 engl. Technical Data: Tanks Stirred tank: 15L Collecting tank: 70L 2 pumps Flow rate: 60l/min Head: 20m Heat exchanger transfer surface: 0,8m² Heater power output: 2kW Temperature and level controller parameterisable as P, PI or PID controller Switching controller Measuring ranges Flow rate: 60...640l/h Temperature: 0...100°c Level: 0...1000mm 3-way motorised valve opening: 0...100% 230V, 50Hz, 1 phase

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