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Systems interactions analysis for the energy efficiency improvement of a Kraft process

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  • Mateos-Espejel, Enrique
  • Savulescu, Luciana
  • Maréchal, François
  • Paris, Jean

Abstract

Several techniques are available to improve the energy performance of a process (internal heat recovery, water reutilization, condensates return, energy upgrading and conversion, elimination of non-isothermal mixing). They are applied to specific energy systems on the utility or process side (steam production and distribution, hot or cold water networks, process heat sources and sinks). Since those systems are interconnected, actions taken on one of them may have effects on another. These effects can be positive (synergies) or negative (counter-actions). A systematic, stepwise methodology has been developed to ensure that synergies are exploited and counter-actions avoided, and is presented. It has been validated by application to an existing Kraft pulping mill. Key performance indicators and the evolution of the thermal composite curves were used to monitor progress as the successive steps of the methodology were implemented. It was found that the combined direct and indirect effects of water reutilization constituted the most important source of potential energy savings. Water reutilization also reduced the need for additional purchased heat exchanger area. Overall, the water intake by the mill could be reduced by 33% and steam savings could be 26% of current production. This would liberate sufficient steam production capacity for the installation of a 44.4 MW cogeneration unit.

Suggested Citation

  • Mateos-Espejel, Enrique & Savulescu, Luciana & Maréchal, François & Paris, Jean, 2010. "Systems interactions analysis for the energy efficiency improvement of a Kraft process," Energy, Elsevier, vol. 35(12), pages 5132-5142.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:12:p:5132-5142
    DOI: 10.1016/j.energy.2010.08.002
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    References listed on IDEAS

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    1. Wall, Göran, 1988. "Exergy flows in industrial processes," Energy, Elsevier, vol. 13(2), pages 197-208.
    2. Savulescu, Luciana Elena & Alva-Argaez, Alberto, 2008. "Direct heat transfer considerations for improving energy efficiency in pulp and paper Kraft mills," Energy, Elsevier, vol. 33(10), pages 1562-1571.
    3. Lambert, Jean & Sorin, Mikhail & Paris, Jean, 1997. "Analysis of oxygen-enriched combustion for steam methane reforming (SMR)," Energy, Elsevier, vol. 22(8), pages 817-825.
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    5. Costa, Andrea & Bakhtiari, Bahador & Schuster, Sebastian & Paris, Jean, 2009. "Integration of absorption heat pumps in a Kraft pulp process for enhanced energy efficiency," Energy, Elsevier, vol. 34(3), pages 254-260.
    6. Favrat, D. & Marechal, F. & Epelly, O., 2008. "The challenge of introducing an exergy indicator in a local law on energy," Energy, Elsevier, vol. 33(2), pages 130-136.
    7. Bakhtiari, Bahador & Fradette, Louis & Legros, Robert & Paris, Jean, 2010. "Opportunities for the integration of absorption heat pumps in the pulp and paper process," Energy, Elsevier, vol. 35(12), pages 4600-4606.
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