Sequential methodology for integrated optimization of energy and water use during batch process scheduling

Abstract Though commonly encountered in practice, energy and water minimization simultaneously during batch process scheduling has been largely neglected in literature. In this paper, we present a novel framework for incorporating simultaneous energy and water minimization in batch process scheduling. The overall problem is decomposed into three parts – scheduling, heat integration, and water reuse optimization – and solved sequentially. Our approach is based on the precept that in any production plant, utilities (energy and water) consumption is subordinate to the production target. Hence, batch scheduling is solved first to meet an economic objective function. Next, alternate schedules are generated through a stochastic search-based integer cut procedure. For each resulting schedule, minimum energy and water reuse targets are established and networks identified. As illustrated using two well-known case studies, a key feature of this approach is its ability to handle problems that are too complex to be solved using simultaneous methods.

[1]  Iftekhar A. Karimi,et al.  Scheduling Parallel Production Lines with Resource Constraints. 1. Model Formulation , 2002 .

[2]  I. Or,et al.  A computerized and integrated approach for heat exchanger network design in multipurpose batch plants , 2001 .

[3]  L. Puigjaner,et al.  Method to incorporate energy integration considerations in multiproduct batch processes , 1994 .

[4]  Ferenc Friedler,et al.  Incorporating heat integration in batch process scheduling , 2003 .

[5]  Chuei-Tin Chang,et al.  Integrated water network designs for batch processes , 2007 .

[6]  G. Reklaitis,et al.  Optimal scheduling of cyclic batch processes for heat integration. I: Basic formulation , 1995 .

[7]  Luis Puigjaner,et al.  Optimisation of water use in batch process industries , 1999 .

[8]  Zainuddin Abdul Manan,et al.  Synthesis of maximum water recovery network for batch process systems , 2005 .

[9]  N. Giannelos,et al.  A Simple New Continuous-Time Formulation for Short-Term Scheduling of Multipurpose Batch Processes , 2002 .

[10]  A. Barbosa‐Póvoa,et al.  Simple Continuous-Time Formulation for Short-Term Scheduling of Batch and Continuous Processes , 2004 .

[11]  R. Sargent,et al.  A general algorithm for short-term scheduling of batch operations */I , 1993 .

[12]  Iftekhar A. Karimi,et al.  A simpler better slot-based continuous-time formulation for short-term scheduling in multipurpose batch plants , 2005 .

[13]  C. Floudas,et al.  Optimal Event Point Determination for Short-Term Scheduling of Multipurpose Batch Plants via Unit-Specific Event-Based Continuous-Time Approaches , 2010 .

[14]  Augusto Q. Novais,et al.  Optimal Design of Heat-Integrated Multipurpose Batch Facilities with Economic Savings in Utilities: A Mixed Integer Mathematical Formulation , 2003, Ann. Oper. Res..

[15]  M. Zedtwitz,et al.  The chemical and pharmaceutical industry in China : opportunities and threats for foreign companies , 2005 .

[16]  Jie Li,et al.  A novel approach to scheduling multipurpose batch plants using unit-slots , 2009 .

[17]  C. Floudas,et al.  An Analysis of Some Unit-Specific Event-Based Models for the Short-Term Scheduling of Noncontinuous Processes , 2010 .

[18]  U. V. Shenoy,et al.  Heat Exchanger Network Synthesis:: Process Optimization by Energy and Resource Analysis , 1995 .

[19]  Y.-P. Wang,et al.  Time pinch analysis , 1995 .

[20]  C. Floudas,et al.  Effective Continuous-Time Formulation for Short-Term Scheduling. 1. Multipurpose Batch Processes , 1998 .

[21]  Ignacio E. Grossmann,et al.  Heat integration in batch processing , 1986 .

[22]  Ignacio E. Grossmann,et al.  New general continuous-time state-task network formulation for short-term scheduling of multipurpose batch plants , 2003 .

[23]  Jacques F. Gouws,et al.  Flexible mass transfer model for water minimization in batch plants , 2008 .

[24]  Ignacio E. Grossmann,et al.  A structural optimization approach in process synthesis. II: Heat recovery networks , 1983 .

[25]  Lazaros G. Papageorgiou,et al.  Optimal scheduling of heat-integrated multipurpose plants , 1994 .

[26]  Thokozani Majozi,et al.  A mathematical optimisation approach for wastewater minimisation in multipurpose batch plants: Multiple contaminants , 2009, Comput. Chem. Eng..

[27]  Thokozani Majozi.  Heat integration of multipurpose batch plants using a continuous-time framework , 2006 .

[28]  Thokozani Majozi,et al.  A graphical technique for wastewater minimisation in batch processes. , 2006, Journal of environmental management.

[29]  Y. Feng,et al.  Alternative discriminant vectors in LP models and a regularization method , 1997, Ann. Oper. Res..

[30]  Robin Smith,et al.  Chemical Process: Design and Integration , 2005 .

[31]  Iftekhar A. Karimi,et al.  Resource-constrained scheduling of parallel production lines using asynchronous slots , 2003 .

[32]  Luis Puigjaner,et al.  Global strategy for energy and waste analysis in scheduling and planning of multiproduct batch chemical processes , 1996 .

[33]  Christodoulos A. Floudas,et al.  Continuous-time versus discrete-time approaches for scheduling of chemical processes: a review , 2004, Comput. Chem. Eng..

[34]  Dominic C.Y. Foo,et al.  Minimum units targeting and network evolution for batch heat exchanger network , 2008 .

[35]  R. Srinivasan,et al.  Sequential Methodology for Scheduling of Heat-Integrated Batch Plants , 2009 .

[36]  Jacques F. Gouws,et al.  Water Minimization Techniques for Batch Processes , 2010 .

[37]  Thokozani Majozi,et al.  An effective technique for wastewater minimisation in batch processes , 2005 .

[38]  James G. Mann,et al.  Industrial Water Reuse and Wastewater Minimization , 1999 .

[39]  Klaus Lucas,et al.  Heat integration of batch processes , 2000 .

[40]  Nilay Shah,et al.  Heat exchanger network design for multipurpose batch plants , 1996 .

[41]  Robin Smith,et al.  Automated Design of Discontinuous Water Systems , 2004 .

[42]  Ignacio E. Grossmann,et al.  A structural optimization approach in process synthesis—I: Utility systems , 1983 .

[43]  R. M. Wood,et al.  Heat Integration For Batch Processes: Part 1: Process Scheduling Based on Cascade Analysis , 1998 .