Development of a Continuous Blending System

University essay from Lunds universitet/Industriell elektroteknik och automation

Author: Eli Al Hadawi; [2011]

Keywords: Inline blending; STEP7; HMI; PLC; PID; Technology and Engineering;

Abstract: The company QB Food Tech designs and installs powder in liquid mixing systems for the food and pharmaceutical industries. The aim of this master thesis is to develop a continuous blending system with concentration output feedback for inline blending of complex products starting from an existing batch process. A method for measuring a substance concentration in flow‐rates therefore needs to be established. The measured concentration signal is then used for controlling the inflow rate of raw materials; a PID controller block is used for achieving this task. The whole system is PLC controlled and programmed in Siemens SIMATIC STEP7 software. An HMI operator‐panel enables parameter adjustments and results of the monitored concentration and relevant actuators are shown in real‐time via the panel.

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