Efficient Method for Flexibility Analysis of Large-Scale Nonconvex Heat Exchanger Networks

A novel method is proposed for flexibility analysis of nonconvex heat exchanger networks. In this method, the direction matrix is introduced to describe the deviation direction of the uncertain parameter. Then by searching the critical directions that restrict the process flexibility with the simulated annealing algorithm, the flexibility index can be obtained. Since the directions are no longer limited to the vertices, this method can well deal with the nonconvex problems. Moreover, for large-scale problems, a decoupling strategy is developed to enhance the efficiency. On the basis of this, the entire network is decomposed into several independent subnetworks, and the one with the lowest flexibility decides the global flexibility index. Two examples are studied, and the results well demonstrate the various aspects dealt with in this work.

[1]  C. Floudas,et al.  Active constraint strategy for flexibility analysis in chemical processes , 1987 .

[2]  S. R. Wan Alwi,et al.  Flexible and Operable Heat Exchanger Networks , 2013 .

[3]  Yu Qian,et al.  Dynamic flexibility analysis of chemical reaction systems with time delay: Using a modified finite element collocation method , 2011 .

[4]  Ignacio E. Grossmann,et al.  An index for operational flexibility in chemical process design. Part I , 1983 .

[5]  Robin Smith,et al.  Heat exchanger network retrofit with a fixed network structure , 2014 .

[6]  Chuei-Tin Chang,et al.  An algorithmic revamp strategy for improving operational flexibility of multi-contaminant water networks , 2013 .

[7]  Cheng-Liang Chen,et al.  Simultaneous Synthesis of Flexible Heat-Exchange Networks with Uncertain Source-Stream Temperatures and Flow Rates , 2004 .

[8]  Hao Wu,et al.  Flexible heat exchanger network design for low-temperature heat utilization in oil refinery , 2011 .

[9]  Vincentius Surya Kurnia Adi,et al.  A mathematical programming formulation for temporal flexibility analysis , 2013, Comput. Chem. Eng..

[10]  Marianthi G. Ierapetritou,et al.  Design Optimization under Parameter Uncertainty for General Black-Box Models , 2002 .

[11]  Jing Wang,et al.  A Method for Flexible Heat Exchanger Network Design under Severe Operation Uncertainty , 2013 .

[12]  Charu Chandra,et al.  Role of Flexibility in Supply Chain Design and Modeling – Introduction to the Special Issue , 2009 .

[13]  Uğur Akman,et al.  Flexibility and operability analysis of a HEN-integrated natural gas expander plant , 2005 .

[14]  Ignacio E. Grossmann,et al.  Optimal process design under uncertainty , 1983 .

[15]  Ignacio E. Grossmann,et al.  An index for operational flexibility in chemical process design. Part I: Formulation and theory , 1985 .

[16]  Ignacio E. Grossmann,et al.  Simultaneous synthesis of heat exchanger networks with operability considerations: Flexibility and controllability , 2013, Comput. Chem. Eng..

[17]  Spandan Maiti,et al.  Computationally efficient black-box modeling for feasibility analysis , 2010, Comput. Chem. Eng..

[18]  Zdravko Kravanja,et al.  A strategy for MINLP synthesis of flexible and operable processes , 2004, Comput. Chem. Eng..

[19]  Chuei-Tin Chang,et al.  A heuristic revamp strategy to improve operational flexibility of water networks based on active constraints , 2010 .

[20]  Sau Man Lai,et al.  Feasibility and flexibility for a trigeneration system , 2009 .

[21]  Marianthi G. Ierapetritou,et al.  Feasibility Evaluation of Nonconvex Systems Using Shape Reconstruction Techniques , 2005 .

[22]  Chuei-Tin Chang,et al.  A new approach to generate flexible multiperiod heat exchanger network designs with timesharing mechanisms , 2013 .

[23]  Zdravko Kravanja,et al.  Identification of critical points for the design and synthesis of flexible processes , 2008, Comput. Chem. Eng..

[24]  Lorenz T. Biegler,et al.  New strategies for flexibility analysis and design under uncertainty , 2000 .

[25]  Marianthi G. Ierapetritou,et al.  New Approach for Quantifying Process Feasibility: Convex and 1-D Quasi-Convex Regions , 2001 .

[26]  Mahmoud M. El-Halwagi,et al.  Floating pinch method for utility targeting in heat exchanger network (HEN) , 2014 .