Floating pinch method for utility targeting in heat exchanger network (HEN)

Abstract Most of the established methods for utility targeting in a heat exchanger network (HEN) are mainly focusing on fixed stream conditions, where the flow rate, heat capacity, supply and target temperatures are fixed. However, in the process industries, the stream conditions (flow rates and temperatures) are not fixed. Therefore, the established HEN targeting methods cannot be directly applied to locate the hot and cold utility targets for HEN problem with varying flow rates and temperatures. To address this issue, a revised floating pinch method which uses binary variables to parameterise the stream locations on the composite curves, is presented in this work to identify the minimum utilities targets. The revised method simplify the earlier version of floating pinch method presented by Duran and Grossmann (1986) by avoiding the non-differentiability in the mathematical program. Two cases, one with fixed parameters while another with temperature-dependent properties and varying operating parameters are solved to illustrate the revised model.

[1]  Arthur W. Westerberg,et al.  Minimum utility usage in heat exchanger network synthesis : a transportation problem , 1983 .

[2]  John R. Flower,et al.  Synthesis of heat exchanger networks: I. Systematic generation of energy optimal networks , 1978 .

[3]  Christodoulos A. Floudas,et al.  Automatic synthesis of optimum heat exchanger network configurations , 1986 .

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

[5]  Robin Smith,et al.  Cost optimum heat exchanger networks—2. targets and design for detailed capital cost models , 1990 .

[6]  J. R. Roach,et al.  Synthesis of heat exchanger networks featuring multiple pinch points , 1989 .

[7]  Kevin C. Furman,et al.  A Critical Review and Annotated Bibliography for Heat Exchanger Network Synthesis in the 20th Century , 2002 .

[8]  John R. Flower,et al.  Synthesis of heat exchanger networks: II. Evolutionary generation of networks with various criteria of optimality , 1978 .

[9]  R. M. Wood,et al.  The flexible pinch design method for heat exchanger networks. I: Heuristic guidelines for free hand designs , 1990 .

[10]  María Rosa Galli,et al.  Synthesis of flexible heat exchanger networks—III. Temperature and flowrate variations , 1991 .

[11]  R. M. Wood,et al.  A new option for heat exchanger network design , 1991 .

[12]  Mahmoud M. El-Halwagi,et al.  Simultaneous synthesis of mass‐exchange and regeneration networks , 1990 .

[13]  B. Linnhoff,et al.  The pinch design method for heat exchanger networks , 1983 .

[14]  Bodo Linnhoff,et al.  A User guide on process integration for the efficient use of energy , 1994 .

[15]  N. Aguilera,et al.  Flexibility test for heat exchanger networks with uncertain flowrates , 1995 .

[16]  María Rosa Galli,et al.  A designer-controlled framework for the synthesis of heat exchanger networks involving non-isothermal mixers and multiple units over split streams , 1998 .

[17]  Z. Fonyó,et al.  Hidden and pseudo pinch phenomena and relaxation in the synthesis of heat-exchange networks , 1986 .

[18]  G. Nasini,et al.  Flexibility test for heat exchanger networks with non-overlapping inlet temperature variations , 1996 .

[19]  Bodo Linnhoff,et al.  Cost optimum heat exchanger networks—1. Minimum energy and capital using simple models for capital cost , 1990 .

[20]  Tomio Umeda,et al.  A thermodynamic approach to heat integration in distillation systems , 1979 .

[21]  Ferenc Friedler,et al.  A simple approach for maximum heat recovery calculations , 1992 .

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

[23]  B Linnhoff,et al.  PINCH ANALYSIS- A STATE OF THE RRT REVIEW , 1993 .

[24]  E. Hohmann.  Optimum networks for heat exchange , 1999 .

[25]  E. Rev,et al.  ADDITIONAL PINCH PHENOMENA PROVIDING IMPROVED SYNTHESIS OF HEAT EXCHANGE NETWORKS. , 1986 .

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

[27]  R. M. Wood,et al.  A new dual-temperature design method for the synthesis of heat exchanger networks , 1989 .

[28]  L. Naess,et al.  The synthesis of cost optimal heat exchanger networks. An industrial review of the state of the art , 1988 .

[29]  Jaime Cerdá,et al.  Synthesis of structural-constrained heat exchanger networks—I. Series networks , 1998 .

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

[31]  Ignacio E. Grossmann,et al.  Simultaneous optimization and heat integration of chemical processes , 1986 .

[32]  B. Linnhoff,et al.  Pinch analysis : a state-of-the-art overview : Techno-economic analysis , 1993 .

[33]  Christodoulos A. Floudas,et al.  Synthesis of flexible heat exchanger networks with uncertain flowrates and temperatures , 1987 .