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Plenary Speakers



Optimization-based Process Synthesis for Sustainable Power Generation

L. T. Biegler, Carnegie Mellon University, Pittsburgh, USA

Novel power generation processes are challenged by needs for CO2 minimization, higher energy efficiency and integration of superior processing technologies. These challenges also require the development of more effective models and strategies for large-scale process optimization. This talk considers optimization tools and formulations for process synthesis that highlight reduced order modeling, structural changes via complementarity conditions and fast optimization algorithms. The combined approach is demonstrated on the process synthesis of a novel oxycombustion process.

Lorenz T. (Larry) Biegler is the Bayer University Professor of Chemical Engineering at Carnegie Mellon University, which he joined after receiving his PhD from the University of Wisconsin in 1981. His research interests lie in computer aided process engineering (CAPE) and include flowsheet optimization, optimization of systems of differential and algebraic equations, reactor network synthesis and algorithms for constrained, nonlinear process control.  Prof. Biegler is an author on over 300 archival publications and two books and has been an institute fellow at the National Energy Technology Lab, a Chang Jiang scholar at Zhejiang University,  a Fulbright Fellow at the University of Heidelberg, and the Hougen Visiting Professorship at the University of Wisconsin.



Synthesis of Water Networks with Water Loss and Gain via an Extended Pinch Analysis Technique

X. Feng, China University of Petroleum, Beijing, China

In recent years, water scarcity and stringent environmental protection legislation motivate the process industries to emphasis on wastewater minimization in their daily operations. Up to date, water pinch analysis is commonly accepted as promising tools on the synthesis of water networks in process industries. In industrial practice, there may be water loss or gain for certain water-using processes. For instance, the make-up to cooling towers accounted for evaporation and leakage is typically fixed flow rate which is lost. Besides, water may leave with the product and it is another example of water loss. On the other hand, the dewatering process may generate certain amount of water as an example of water gain. In this paper, the previous works on the synthesis of water network considering water loss/gain are reviewed thoroughly. The approaches can be divided into two board categories: Pinch analysis and Mathematical programming. The recently developed approach for targeting and design of water network with water loss/gain is presented in detail. The revised limiting water profile is introduced for the flow rate targeting of a water-using process with water loss/gain. The Process-based Graphical Approach (PGA) is presented for the simultaneous targeting and design of water networks. Via the PGA procedure, in addition to locate the minimum freshwater and wastewater flow rate targets, the water network that corresponds to the minimum flow rate targets is also identified simultaneously. The PGA procedure is illustrated via solving a literature example. In addition, the generalised procedure for the presented PGA is summarised in a diagram. Finally, comparison is made between it and those approaches in literatures.

Xiao Feng is a professor of Chemical Engineering at China University of Petroleum – Beijing, which she joined in 2009 after working more than 20 years in Xi’an Jiaotong University, China. Her research interests lie in process integration and include energy, water and hydrogen system integration, by graphical method and mathematical programming. Prof. Feng is an author on over 200 archival publications and two books and the Vice-Chair of the Thermodynamics and Engineering Application Committee, China Energy Research Society, Standing Director of Chinese Chemical Education Society, and Director of Process System Engineering Society, Chinese System Engineering Society.



Process Integration in Sub-ambient Processes

T. Gundersen, Norwegian University of Science and Technology, Trondheim, Norway

Sub-ambient processes differ from above ambient plants in a number of ways. Refrigeration represents an expensive cold utility produced by compression and expansion (i.e. work or exergy), the distinction between process streams and utilities is vague since streams are temporarily acting as utilities, and does not work as an economic trade-off parameter, to mention a few characteristics. In fact, the path between supply and target state for process streams is not defined, rather it is a resulting part of the optimal design and the process Pinch tends to disappear. This talk illustrates how these challenges can be addressed by a combination of Pinch Analysis, Exergy considerations and Mathematical Optimization. Applications will cover cryogenic processes for air separation (ASUs) and liquefaction of natural gas to produce LNG.

Truls Gundersen is a Professor of Energy and Process Engineering at the Norwegian University of Science and Technology (NTNU) that he joined in 1996. He received a PhD in Chemical Engineering from the same university in 1982 and spent 12 years in industry with Norsk Hydro before joining academia in 1993. His research interests include Process Integration and Process Synthesis with special emphasis on the use of Thermodynamics in the design phase. He is also involved in CCS as the NTNU coordinator of BIGCCS, a 75 million USD program that runs for 8 years. He was elected member of the Norwegian Academy of Technological Sciences in 1991.

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