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Process Integration: HEN Synthesis, Exergy Opportunities

  • Zdravko Kravanja
  • Miloš Bogataj
  • Aleksandr Soršak
Chapter
Part of the Green Energy and Technology book series (GREEN)

Abstract

This chapter provides a brief description of thermodynamic analysis, the maximization of heat-recovery and power generation and the synthesis of IGCC’s heat exchanger network. Trade-offs between the income from power generation and utility costs plus the investment in HEN are studied with respect to the generation of different pressure-levels of steam and temperature driving force losses within the heat-recovery network. A combined pinch analysis/mathematical programming approach is applied and the optimization models are described for (i) the maximization of heat-recovery and power generation, and (ii) a synthesis of the heat-recovery and steam/power generation network. A sensitivity analysis for the synthesis is performed in order to show how optima are sensible for the expected increase in future electricity and utility prices, and the project’s lifetime. The results obtained from the studied IGCC process indicate that detailed optimization has to be performed during the network synthesis step, otherwise optimal trade-offs are missed that may result either in serious power generation losses or in obtained over-designed networks.

Keywords

Heat Exchanger Process Stream Exergy Efficiency Pinch Analysis Integrate Gasification Combine Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notation

ASU

Air separator unit

CP

Claus plant

GCC

Grand composite curve

GT

Gas turbine

HE

Heat exchanger

HEN

Heat exchange network

HPS

High-pressure steam

HRAT

Heat-recovery approach temperature

HRSG

Heat-recovery steam generator

LP

Linear programming

LPS

Low-pressure steam

MINLP

Mixed-integer non-linear programming

MPS

Medium pressure steam

OA/ER

Outer-approximation/equality-relaxation

ST

Steam turbine

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Copyright information

© Springer-Verlag London Limited 2011

Authors and Affiliations

  • Zdravko Kravanja
    • 1
  • Miloš Bogataj
    • 1
  • Aleksandr Soršak
    • 2
  1. 1.Faculty of Chemistry and Chemical Engineering, University of MariborMariborSlovenia
  2. 2.Javni zdravstveni zavod Mariborske lekarne MariborMariborSlovenia

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