Improving energy efficiency of an Olefin plant – A new approach

Abstract Low-temperature gas separation processes are the most important gas separation routes. There is a complex interaction between core process (separation columns), associated heat exchanger network and refrigeration cycles in sub ambient processes. The aim of this paper is performing a comprehensive retrofit study of an Olefin plant (as an industrial example) to improve the overall energy efficiency. In this regard, the effect of improving column operating parameters and refrigeration cycles are first evaluated separately. Then, column operating parameters and refrigeration cycles as well as heat exchanger network are optimized simultaneously using genetic algorithm or simulated annealing. Having compared all results, one can conclude that simultaneous optimization leads to higher efficiency of the overall system.

[1]  Bodo Linnhoff,et al.  Distillation column targets , 1993 .

[2]  Rafiqul Gani,et al.  A New Retrofit Design Methodology for Identifying, Developing, and Evaluating Retrofit Projects for Cost-Efficiency Improvements in Continuous Chemical Processes , 2005 .

[3]  Robin Smith,et al.  Synthesis and Optimization of Low-Temperature Gas Separation Processes , 2005 .

[4]  Ignacio E. Grossmann,et al.  Simultaneous Retrofit and Heat Integration of Chemical Processes , 2008 .

[5]  Megan Jobson,et al.  Shortcut Models for Retrofit Design of Distillation Columns , 2003 .

[6]  Nghi Nguyen,et al.  Retrofit of distillation columns in biodiesel production plants , 2010 .

[7]  Rafiqul Gani,et al.  Screening for profitable retrofit options of chemical processes: A new method , 2003 .

[8]  Andreas A. Linninger,et al.  Industry-wide energy saving by complex separation networks , 2009, Comput. Chem. Eng..

[9]  Robin Smith,et al.  Design and Optimization of Flexible Utility Systems Subject to Variable Conditions: Part 1: Modelling Framework , 2007 .

[10]  Y. Demirel.  Retrofit of Distillation Columns Using Thermodynamic Analysis , 2006 .

[11]  Nassim Tahouni,et al.  Comparison of sequential and simultaneous design and optimization in low-temperature liquefaction and gas separation processes , 2011, J. Frankl. Inst..

[12]  Chi Wai Hui,et al.  Simultaneous optimization of energy and materials based on heat exchanger network simulation for diesel hydrotreating units , 2010 .

[13]  M. H. Panjeshahi,et al.  Retrofit of ammonia plant for improving energy efficiency , 2008 .

[14]  S. Bandyopadhyay.  Effect of feed on optimal thermodynamic performance of a distillation column , 2002 .

[15]  Yaşar Demirel,et al.  Using thermally coupled reactive distillation columns in biodiesel production , 2011 .

[16]  Peter Mizsey,et al.  Methodology for the design and evaluation of distillation systems: Exergy analysis, economic features and GHG emissions , 2009 .

[17]  Megan Jobson,et al.  Retrofit Design for Increasing the Processing Capacity of Distillation Columns: 1. A Hydraulic Performance Indicator , 2004 .

[18]  N. Tahouni,et al.  Comparison of stochastic methods with respect to performance and reliability of low‐temperature gas separation processes , 2010 .

[19]  Hasan Y. Alhammadi,et al.  A systematic procedure for optimizing crude oil distillation systems , 2008 .

[20]  Zhaolin Gu,et al.  Retrofitting of a distillery based on process synthesis , 2007 .

[21]  Ignacio E. Grossmann,et al.  Optimal synthesis of integrated refrigeration systems—II: Implicit enumeration scheme , 1986 .

[22]  Yasuki Kansha,et al.  Application of the self-heat recuperation technology to crude oil distillation , 2011 .

[23]  Amin Hadidi,et al.  Design and economic optimization of shell-and-tube heat exchangers using biogeography-based (BBO) algorithm , 2013 .

[24]  J. L. Bravo.  Select structured packings or trays , 1997 .

[25]  Nguyen Van Duc Long,et al.  Design and optimization of a dividing wall column for debottlenecking of the acetic acid purification process , 2010 .

[26]  K. A. Amminudin,et al.  Design and Optimization of Fully Thermally Coupled Distillation Columns: Part 2: Application of Dividing Wall Columns in Retrofit , 2001 .

[27]  H. Z. Kister,et al.  How do trays and packings stack up , 1994 .

[28]  Robin Smith,et al.  Design and Optimization of Flexible Utility Systems Subject to Variable Conditions: Part 2 Methodology and Applications , 2007 .

[29]  Peter Glavič,et al.  Simultaneous retrofit of complex and energy intensive processes-III , 2000 .

[30]  Chi Wai Hui,et al.  A hydraulics-based heuristic strategy for capacity expansion retrofit of distillation systems and an industrial application on a light-ends separation plant , 2012 .

[31]  Haslenda Hashim,et al.  Optimal design of distillation column using three dimensional exergy analysis curves , 2010 .

[32]  Shabina Khanam,et al.  Hydrogen distribution in the refinery using mathematical modeling , 2010 .

[33]  N.D.K. Asante,et al.  An Automated and Interactive Approach for Heat Exchanger Network Retrofit , 1997 .

[34]  Ignacio E. Grossmann,et al.  Optimal synthesis of integrated refrigeration systems—I: Mixed-integer programming model , 1986 .

[35]  Konrad Hungerbühler,et al.  Systematic Retrofit Method for Chemical Batch Processes Using Indicators, Heuristics, and Process Models , 2008 .