Drying is one of the complex and highly energy consuming process unit operation used in many industry such as textile, paper, chemical, pharmaceuticals, agro and food processing, sugar, etc. Significant R&D efforts are underway in last more than a decade to enhance dryer technology and operations to enhance its energy efficiency. A mathematical modelling and simulation framework is developed on the MATLAB-SIMULINK platform for rotary dryer. The model is semi-empirical based on the first principles using mass balance and moisture balance equations amongst the vegetables and hot air. Later, a mathematical model for textile dryer machine has been developed by modifying the rotary dryer model. Keywords-Discretized model, mathematical model of rotary dryer, modelling of textile dryer
This paper focuses on development of PID controller for a single tank level control system using concepts of industrial automation. The idea behind this work is to replace the conventional PID controller available in the level control trainer system with a high end Programmable Logic Controller. The motive behind doing this is to obtain a complete understanding of the changes in the dynamics of the system and transient response characteristics associated with the system. Mathematical model is obtained for the actual system using the mass-balance formulas and the same model is validated. Using NI-LabVIEW, a SCADA platform is developed to monitor the system and log the real-time process data. MODBUS RTU communication protocol is used to exchange the real-time process parameters between PLC and NI-LabVIEW. The developed setup can be used to analyze and implement advance process control algorithm like Auto tuning etc. in place of the existing conventional controller in future.
The conventional bottle washer machines are suitable only for medium scale and large scale beverage industry due to their high bottle washing capacity and mechanical and control complexity. This paper proposes the design and automation of the economical bottle washer machine for the small scale beverage industry without compromising its control capabilities. The importance and requirement of the bottle washer machine in the beverage industry has been discussed. The design of the proposed bottle washer machine for RGBs (Returnable Glass Bottles) has been created in the Creo software. The different treatment zones and working of the bottle washer machine has been discussed. The bottle washer machine has been automatized using the Siemens S7-317-2-PN/DP PLC (Programmable Logic Controller) and programmed using a ladder diagram in the SIMATIC Manager. The level control for different treatment zones is achieved by means of limit switches and temperature control for different treatment zones is achieved by using Pt1000 RTD, SSR (Solid State Relay) and heater. The different control schemes for the temperature control has been discussed, implemented and compared. The results show that the PID temperature control is the most effective control scheme for the temperature control of the different treatment zones. The implementation of the PID temperature control and auto-tuning of the sample process has been shown. The holistic control of the bottle washer machine also has been discussed and assessed.
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