Optimum heat storage design for heat integrated multipurpose batch plants

Heat integration to minimise energy usage in multipurpose batch plants has been in published literature for more than two decades. In most present methods, time is fixed a priori through a known schedule, which leads to suboptimal results. The method presented in this paper treats time as a variable, thereby leading to improved results. Both direct and indirect heat integration are considered together with optimisation of heat storage size and initial temperature of heat storage medium. The resulting model exhibits MINLP structure, which implies that global optimality cannot generally be guaranteed. However, a procedure is presented that seeks to find a globally optimal solution, even for nonlinear problems. Heat losses from the heat storage vessel during idling are also considered. This work is an extension of MILP model of Majozi (2009), which was more suited to multiproduct rather than multipurpose batch facilities. Optimising the size of the heat storage vessel as well as the initial temperature of the heat storage fluid decreased the requirement for external hot utility for an industrial case study by 33% compared to using known parameters.

[1]  A. O. Oni,et al.  Energy and exergy analyses of malt drink production in Nigeria , 2010 .

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

[3]  Martin John Atkins,et al.  THE CHALLENGE OF INTEGRATING NON-CONTINUOUS PROCESSES – MILK POWDER PLANT CASE STUDY , 2009 .

[4]  Kun Soo Chang,et al.  Synthesis of maximum energy recovery networks in batch processes , 1994 .

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

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

[7]  Peter Glavič.  Complex integration of processes , 2001 .

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

[9]  Thokozani Majozi,et al.  Minimization of energy use in multipurpose batch plants using heat storage: an aspect of cleaner production , 2009 .

[10]  D. Mignon,et al.  Using batches for modeling and optimizing the brewhouses of an industrial brewery , 1993 .

[11]  Cheng-Liang Chen,et al.  A resource-task network approach for optimal short-term/periodic scheduling and heat integration in multipurpose batch plants , 2009 .

[12]  F. C. Knopf,et al.  Optimal design of batch/semicontinuous processes , 1982 .

[13]  I. Grossmann,et al.  Global optimization of bilinear process networks with multicomponent flows , 1995 .

[14]  Peter Glavič,et al.  Energy saving opportunities in heat integrated beverage plant retrofit , 2010 .

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

[16]  Carlos J. Renedo,et al.  A review: Energy recovery in batch processes , 2012 .

[17]  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..

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

[19]  Lazaros G. Papageorgiou,et al.  Optimal scheduling of heat-integrated multipurpose plants under fouling conditions , 2001 .

[20]  Predrag Rašković,et al.  Process integration in bioprocess indystry: waste heat recovery in yeast and ethyl alcohol plant , 2010 .

[21]  R. de Boer.  Heat storage systems for use in an industrial batch process (Results of) A case study , 2006 .

[22]  Cheng-Liang Chen,et al.  Design and Optimization of Indirect Energy Storage Systems for Batch Process Plants , 2008 .

[23]  Thore Berntsson,et al.  Efficient energy use in a slaughter and meat processing plant—opportunities for process integration , 2006 .

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

[25]  Ferenc Friedler,et al.  Combinatorial technique for short term scheduling of multipurpose batch plants based on schedule-graph representation , 1998 .

[26]  X. Zhu,et al.  A Novel Continuous-Time MILP Formulation for Multipurpose Batch Plants. 1. Short-Term Scheduling , 2001 .

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

[28]  F. Glover.  IMPROVED LINEAR INTEGER PROGRAMMING FORMULATIONS OF NONLINEAR INTEGER PROBLEMS , 1975 .

[29]  Nilay Shah,et al.  Optimal energy integration in batch antibiotics manufacture , 1996 .

[30]  B. Qvale,et al.  Waste-Heat Recovery in Batch Processs Using Heat Storage , 1995 .

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

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

[33]  Hanif D. Sherali,et al.  A new reformulation-linearization technique for bilinear programming problems , 1992, J. Glob. Optim..

[34]  M.A. Waheed,et al.  Energetic analysis of fruit juice processing operations in Nigeria , 2008 .