Modeling and Control of Tray Temperature Along with Column Pressure in a Pilot Plant Distillation Column
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ORIGINAL RESEARCH
Modeling and Control of Tray Temperature Along with Column Pressure in a Pilot Plant Distillation Column Janani Rajaraman1 · Thirunavukkarasu Indiran2 · Eadala Sarath Yadav3 · Shanmuga Priya Selvanathan4 Received: 22 May 2020 / Accepted: 28 September 2020 © Springer Nature Singapore Pte Ltd 2020
Abstract A simple control technique based on centralized and decentralized structure is discussed here for a tray temperature along with pressure developed inside the column for a pilot plant distillation column. The flow rate of vapor condenser cooling water is used to control the pressure (P) developed inside the column. The flow rate of the water to condense the vapor increases, when the column pressure increases and vice versa. Some of the other factor that has an impact on the column pressure is the boil-up rate, rate of reflux ow, feed rate, set point change in composition. The internal reflux and the speed of the vapor through the column gets affected by the pressure developed. There exists a strong interaction between the two interdependent variables pressure and temperature. The goal is to regulate the temperature and pressure near the bottom tray by nominally manipulating the reflux flow and boilup rate. Keywords Decentralized controller · Centralized controller · MIMO process · Decoupler design
Introduction Most of the petrochemical, cement industries are multivariable in nature. Multi-loop controllers are used to control these multivariable process and the process is regarded as a collection of multi-stage loops. PID controllers are commonly used for such processes. Distillation is a method used to distinguish pure liquid from a liquid blend. Distillation This article is part of the topical collection “Computational Statistics” guest edited by Anish Gupta, Mike Hinchey, Vincenzo Puri, Zeev Zalevsky and Wan Abdul Rahim. * Thirunavukkarasu Indiran [email protected] 1
Department of Electronics and Instrumentation Engineering, Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya, Kanchipuram, Tamilnadu, India
2
Department of Instrumentation and Control Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India
3
Department of Electronics and Instrumentation Engineering, Vignan Institute of Technology and Science, Deshmuki, Hyderabad, Telangana, India
4
Department of Chemical Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India
is frequently used to refine the products as an inseparable aspect of the process industry. The column comprises of trays, a section for feed, reboiler, and drum for reflux, condenser and pressure transmitter. In the reflux tank, the condenser gathers the condensate and is stored. The temperature transmitters (4–20 mA) and RTDs are used to record the temperature from the bottom of the column. The pressure transmitter (0–0.5 bar) is used to record the pressure generated at the bottom of the column. In this work, a mixture of Isopropyl alcohol
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