Integrated Scheduling and Dynamic Optimization of Batch Processes Using State Equipment Networks
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1 Integrated Scheduling and Dynamic Optimization of Batch Processes Using State Equipment Networks Yisu Nie 1 Lorenz T. Biegler 1 John M. Wassick 2 1 Center for Advanced Process Decision-making Department of Chemical Engineering Carnegie Mellon University 2 The Dow Chemical Company October 13, 2011 Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
2 Introduction Background and motivation The current status quo of batch scheduling and operations Batch process scheduling: recipe-based approaches Decoupled scheduling and unit operations Dow s practice: Discrete-time resource-task network 1 + Easy (linear) models for scheduling Poor process flexibility Loss of process profitability 1 J.M. Wassick and J. Ferrio. Extending the resource task network for industrial applications. Computers and Chemical Engineering, 2011 Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
3 Introduction Background and motivation The current status quo of batch scheduling and operations Batch process scheduling: recipe-based approaches Decoupled scheduling and unit operations Dow s practice: Discrete-time resource-task network 1 + Easy (linear) models for scheduling Poor process flexibility Loss of process profitability Dynamic optimization of batch operations: few experiences Investigated mostly in single machine environment 1 J.M. Wassick and J. Ferrio. Extending the resource task network for industrial applications. Computers and Chemical Engineering, 2011 Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
4 Introduction Background and motivation The current status quo of batch scheduling and operations Batch process scheduling: recipe-based approaches Decoupled scheduling and unit operations Dow s practice: Discrete-time resource-task network 1 + Easy (linear) models for scheduling Poor process flexibility Loss of process profitability Dynamic optimization of batch operations: few experiences Investigated mostly in single machine environment Integration of scheduling and dynamic optimization Adding value to existing assets Improving plant reliability 1 J.M. Wassick and J. Ferrio. Extending the resource task network for industrial applications. Computers and Chemical Engineering, 2011 Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
5 Introduction Problem description Given A batch plant with existing equipment A time horizon to make products Dynamic models of process operations Determine The optimal production schedule The optimal equipment control strategy Via 1 Process representation using the state equipment network(sen) 2 Mathematical optimization formulation Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
6 Solution Strategy Integrated optimization based on the SEN The SEN represents the process system as a directed graph connecting two kinds of nodes Material Feed, intermediate and final products Equipment Process units carrying out operations Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
7 Solution Strategy Integrated optimization based on the SEN The SEN represents the process system as a directed graph connecting two kinds of nodes Material Feed, intermediate and final products Equipment Process units carrying out operations The integrated formulation Objective function Max Profit = Product sales - Material cost - Operating cost Constraints Scheduling considerations Assignment constraints, material balance, capacity constraints, timing constraints Unit operation Dynamic first-principle models, limits on controls and states Material quality measurement Material blending, quality requirements Auxiliary tightening constraints Tightening timing constraints, mass balance of process units Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
8 Case Study A jobshop batch plant Equipment units and products manufactured in the plant Heater 1 Reactor 2 Filter 2 Distillation Column 1 Packaging Line 2 30(MU/ton) Prod 1 5(MU/ton) Feed A 50(MU/ton) Prod 2 20(MU/ton) Prod 3 Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
9 Case Study A jobshop batch plant Equipment units and products manufactured in the plant Heater 1 Reactor 2 Filter 2 Distillation Column 1 Packaging Line 2 30(MU/ton) Prod 1 5(MU/ton) Feed A 50(MU/ton) Prod 2 20(MU/ton) Prod 3 Maximizing the net profit within a 10-hour time horizon Model Statistics Type Var.(Discrete) # Nonlinear Var. # Cons. # Recipe-based MILP 676(90) Integrated MINLP 4978(90) Model Solution Profit(MU) CPU time (s) Node(Best) # Gap(%) Recipe-based (199) 0.0 Integrated (1602) 67.9 MILP solved by CPLEX, MINLP solved by SBB(CONOPT) Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
10 Case Study Optimal production schedules in Gantt charts Recipe-based approach Heater Reactor1 Reactor2 Filter1 Filter2 Column Line1 Line Heating Reaction1 Reaction2 Filtration1 Filtration2 Distillation1 Distillation2 Packaging1 Packaging2 Packaging3 Heater Reactor1 Reactor2 Filter1 Filter2 Column Line1 Line Time(hr) Integrated approach Time(hr) Heating Reaction1 Reaction2 Filtration1 Filtration2 Distillation1 Distillation2 Packaging1 Packaging2 Packaging3 Numbers inside slots are batch sizes Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
11 Case Study Optimal operating profiles for batch units Optimal temperature profiles of Reactor 1 Scaled temp Scaled temp Scaled temp Scaled temp Recipe Event slot 1: Reaction 1 Integrated Event slot 2: Reaction 2 Time(hr) Event slot 3: Reaction 2 Time(hr) Event slot 4: Reaction 2 Time(hr) Time(hr) Dynamic profiles also obtained for Reactor 2 and Distillation Column Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
12 Conclusions and Acknowledgments Concluding remarks The state equipment network representation of batch processes An optimization formulation for the integration of scheduling and dynamic optimization Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
13 Conclusions and Acknowledgments Concluding remarks The state equipment network representation of batch processes An optimization formulation for the integration of scheduling and dynamic optimization Future work Off-line On-line Alternative scheduling formulations Data-driven dynamic models Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
14 Conclusions and Acknowledgments Concluding remarks The state equipment network representation of batch processes An optimization formulation for the integration of scheduling and dynamic optimization Future work Off-line On-line Alternative scheduling formulations Data-driven dynamic models Thank you I am glad to take questions... Yisu Nie (Carnegie Mellon University) EWO meeting October 13, / 8
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