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

Fiseha Tesfaye, Daniel Lindberg, Mykola Moroz and Leena Hupa
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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
Leena Hupa: Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Piispankatu 8, FI-20500 Turku, Finland

Energies, 2020, vol. 13, issue 20, 1-12

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.

Keywords: sulfates; thermodynamic modeling; superheater tubes; high-temperature processes; slagging and fouling management (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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