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Evaluation of the Energy Efficiency Improvement Potential through Back-End Heat Recovery in the Kraft Recovery Boiler

Author

Listed:
  • Jussi Saari

    (School of Energy Systems, Lappeenranta-Lahti University of Technology LUT, 53850 Lappeenranta, Finland)

  • Ekaterina Sermyagina

    (School of Energy Systems, Lappeenranta-Lahti University of Technology LUT, 53850 Lappeenranta, Finland)

  • Juha Kaikko

    (School of Energy Systems, Lappeenranta-Lahti University of Technology LUT, 53850 Lappeenranta, Finland)

  • Markus Haider

    (Institute for Energy Systems and Thermodynamics, TU Wien, 1060 Wien, Austria)

  • Marcelo Hamaguchi

    (Stora Enso International Oy, 55400 Imatra, Finland)

  • Esa Vakkilainen

    (School of Energy Systems, Lappeenranta-Lahti University of Technology LUT, 53850 Lappeenranta, Finland)

Abstract

Sustainability and energy efficiency have become important factors for many industrial processes, including chemical pulping. Recently complex back-end heat recovery solutions have been applied to biomass-fired boilers, lowering stack temperatures and recovering some of the latent heat of the moisture by condensation. Modern kraft recovery boiler flue gas offers still unutilized heat recovery possibilities. Scrubbers have been used, but the focus has been on gas cleaning; heat recovery implementations remain simple. The goal of this study is to evaluate the potential to increase the power generation and efficiency of chemical pulping by improved back-end heat recovery from the recovery boiler. Different configurations of heat recovery schemes and different heat sink options are considered, including heat pumps. IPSEpro simulation software is used to model the boiler and steam cycle of a modern Nordic pulp mill. When heat pumps are used to upgrade some of the recovered low-grade heat, up to +23 MW gross and +16.7 MW net power generation increase was observed when the whole pulp mill in addition to the boiler and steam cycle is considered as heat consumer. Combustion air humidification proved to yield a benefit only when assuming the largest heat sink scenario for the pulp mill.

Suggested Citation

  • Jussi Saari & Ekaterina Sermyagina & Juha Kaikko & Markus Haider & Marcelo Hamaguchi & Esa Vakkilainen, 2021. "Evaluation of the Energy Efficiency Improvement Potential through Back-End Heat Recovery in the Kraft Recovery Boiler," Energies, MDPI, vol. 14(6), pages 1-21, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:6:p:1550-:d:515015
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    References listed on IDEAS

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    Cited by:

    1. Jussi Saari & Petteri Peltola & Katja Kuparinen & Juha Kaikko & Ekaterina Sermyagina & Esa Vakkilainen, 2023. "Novel BECCS implementation integrating chemical looping combustion with oxygen uncoupling and a kraft pulp mill cogeneration plant," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 28(4), pages 1-26, April.
    2. Jussi Saari & Ekaterina Sermyagina & Katja Kuparinen & Satu Lipiäinen & Juha Kaikko & Marcelo Hamaguchi & Clara Mendoza-Martinez, 2022. "Improving Kraft Pulp Mill Energy Efficiency through Low-Temperature Hydrothermal Carbonization of Biological Sludge," Energies, MDPI, vol. 15(17), pages 1-16, August.

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