Dr. Sujit S Jogwar's Talk

May 26, 2016 - 17:00

May 26, 2016 - 18:00

Room 118 Chemical Engineering

Seminars

Dr. Sujit S Jogwar Assistant Professor ICT Mumbai.

Abstract: Energy integration motivated by the high cost and limited availability of energy is a key feature of modern process industries. Energy-integrated networks offer signicant cost ben- ets however are quite dicult to operate and control due to strong interactions among the individual units and network-level dynamics. Eectively controlling these integrated plants is a critical link to the economic viability and the energy and environmental sustainability of the chemical and energy supply chains. At the same time design and scheduling (in the context of batch processes) have strong implications on the controllability and eectiveness of these integrated systems. Using a simple reactor-heat exchanger system as a motivating example it is shown that the underlying energy ow structure of the integrated networks play a key role in the design of an ecient control system. Specically in the limiting case of tight energy integration such networks exhibit dynamic time scale multiplicity and can thus be cast in to a hierarchical control architecture. Considering the batch (operational mode) equivalent of this reactor- heat exchanger system similar time scale multiplicity is demonstrated; albeit with dierent dynamic characteristics. For both the operational modes the hierarchical control strategy constructively uses the interacting nature of these systems and helps simplify the underlying control problem. Eectiveness of energy integration in batch processes strongly depends on strict adherence to the designed optimal schedule. In this context it is essential that the integrated designs are robust to schedule delays. To this end mixed (combined direct and indirect) integration strategy is used to design robust schedules. An iterative design method is presented to achieve mixed integration which results in improved energy savings while maintaining temperature and time constraints. Ongoing work for improving robustness and handling trade-o between capital and operating cost is highlighted. In a dierent vein design of integrated networks is approached as an `inverse' of the control problem highlighted earlier. While the control problem requires decomposition of the integrated structure the design problem aims at combining the prototype structures to obtain desired control properties. Lastly the interactions in integrated networks are eectively used to obtain optimal schedules. In general computationally expensive mixed-integer optimization is required to schedule integrated batch systems. In this work it is shown that the optimal schedules of integrated networks follow specic patterns. These patterns can be used to generate optimal schedules with an order of magnitude reduction in the computational time. Additionally an interesting relationship between scheduling horizon and storage requirement (design aspect) is highlighted. Overall the presented work demonstrates that interactions in integrated systems are not always undesirable and can facilitate design control and scheduling. The developed tools are generic in nature and nd application to a wide range of energy-integrated congurations ranging from conventional systems to emerging technologies.Bio: I received my undergraduate degree (Bachelor of Chemical Engineering) from the Institute of Chemical Technology Mumbai (formerly UDCT) and my Ph. D. in Chemical Engineering from the University of Minnesota USA. I am currently working as a DST INSPIRE Assistant Professor in the Chemical Engineering department at the Institute of Chemical Technology. I have close to 10 years of research experience split between industrial R & D and academia. My research aims at developing design scheduling and advanced control tools for sustainable processes. Specically I focus on economically attractive (energy) integrated and intensied processes. I was a recipient of Dr. G.P. Kane (Mumbai) University Gold Medal (2006) presti- gious Doctoral Dissertation Fellowship from the University of Minnesota (2010-11) and Smt. Padma Kelkar Endowment Award for Encouragement to New Chemical Engineering Fac- ulty (2014). My work on control of vapor recompression distillation systems won the best presentation award at the American Control Conference (ACC) at Saint Louis USA (2009) and the work on the analysis of tightly integrated networks was invited to be delivered as a keynote lecture in Foundations of Computer-Aided Process Design (FOCAPD) conference at Colorado USA (2009). I intend to build a strong research group focusing on the development of exible (al- lowing for smooth transitions in dynamic market conditions) optimal (consuming minimum material and energy resources) and resilient (robust to external disturbances and uncertain- ties) sustainable processes. My research will provide fundamental advances to the problems that are at the core of active research in process systems engineering as well as target the design and control problems identied through industry collaborations. My research will also provide a setting for the eective training of undergraduate and graduate students in fundamental research cutting across applied mathematics and control theory.