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Investigation of the K-Mg-Ca Sulfate System as Part of Monitoring Problematic Phase Formations in Renewable-Energy Power Plants

Author

Listed:
  • Fiseha Tesfaye

    (Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Piispankatu 8, FI-20500 Turku, Finland)

  • Daniel Lindberg

    (Department of Chemical and Metallurgical Engineering, Aalto University, Kemistintie 1, FI-02150 Espoo, Finland)

  • Mykola Moroz

    (Department of Chemistry and Physics, National University of Water and Environmental Engineering, Soborna 11, UA-33028 Rivne, Ukraine
    Department of Physical and Colloid Chemistry, Ivan Franko National University of Lviv, Kyrylo and Mefodiy 6, UA-79005 Lviv, Ukraine)

  • Leena Hupa

    (Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Piispankatu 8, FI-20500 Turku, Finland)

Abstract

Besides the widely applied hydropower, wind farms and solar energy, biomass and municipal and industrial waste are increasingly becoming important sources of renewable energy. Nevertheless, fouling, slagging and corrosion associated with the combustion processes of these renewable sources are costly and threaten the long-term operation of power plants. During a high-temperature biomass combustion, alkali metals in the biomass fuel and the ash fusion behavior are the two major contributors to slagging. Ash deposits on superheater tubes that reduce thermal efficiency are often composed of complex combinations of sulfates and chlorides of Ca, Mg, Na, and K. However, thermodynamic databases involving all the sulfates and chlorides that would favor a better understanding and control of the problems in combustion processes related to fouling, slagging and corrosion are not complete. In the present work, thermodynamic properties including solubility limits of some phases and phase mixtures in the K 2 SO 4 -(Mg,Ca)SO 4 system were reviewed and experimentally investigated. Based on the new and revised thermochemical data, binary phase diagrams of the K 2 SO 4 -CaSO 4 and K 2 SO 4 -MgSO 4 systems above 400 °C, which are of interest in the combustion processes of renewable-energy power plants, were optimized.

Suggested Citation

  • Fiseha Tesfaye & Daniel Lindberg & Mykola Moroz & Leena Hupa, 2020. "Investigation of the K-Mg-Ca Sulfate System as Part of Monitoring Problematic Phase Formations in Renewable-Energy Power Plants," Energies, MDPI, vol. 13(20), pages 1-12, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5366-:d:428339
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    References listed on IDEAS

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    1. Torsten Schmidt-Baum & Daniela Thrän, 2020. "Nine Measures to Take—Unlocking the Potential for Biomass Heat in the German Industry and the Trade, Commerce, and Service Sector," Energies, MDPI, vol. 13(18), pages 1-23, September.
    2. Lara Febrero & Enrique Granada & Araceli Regueiro & José Luis Míguez, 2015. "Influence of Combustion Parameters on Fouling Composition after Wood Pellet Burning in a Lab-Scale Low-Power Boiler," Energies, MDPI, vol. 8(9), pages 1-23, September.
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    1. Milena Bojanowska & Jarosław Chmiel & Maria Sozańska & Bartosz Chmiela & Joanna Grudzień & Justyna Halska, 2021. "Issues of Corrosion and Degradation under Dusty Deposits of Energy Biomass," Energies, MDPI, vol. 14(3), pages 1-16, January.
    2. Güldane Aslı Turp & Saim Ozdemir & Kaan Yetilmezsoy & Nurtac Oz & Ali Elkamel, 2023. "Role of Vermicomposting Microorganisms in the Conversion of Biomass Ash to Bio-Based Fertilizers," Sustainability, MDPI, vol. 15(11), pages 1-17, June.
    3. Tomasz Hardy & Amit Arora & Halina Pawlak-Kruczek & Wojciech Rafajłowicz & Jerzy Wietrzych & Łukasz Niedźwiecki & Vishwajeet & Krzysztof Mościcki, 2021. "Non-Destructive Diagnostic Methods for Fire-Side Corrosion Risk Assessment of Industrial Scale Boilers, Burning Low Quality Solid Biofuels—A Mini Review," Energies, MDPI, vol. 14(21), pages 1-15, November.

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