• Hupa, Leena
• Moroz, Mykola
• Tesfaye, Fiseha
• Lindberg, Daniel
• Jung, In-Ho

Abstract

<p>Today, aside from the solar, wind and hydropower, solid biomass, municipal solid wastes and&nbsp;industrial wastes are increasingly becoming important sources of renewable energy. However, fouling,&nbsp;slagging and corrosion that are associated with the combustion processes of these renewable&nbsp;resources threaten long-term operation availability and costs of power plants. Alkali metal elements in&nbsp;the biomass fuel and the ash fusion behavior are the two major origins contributing to slagging during&nbsp;high-temperature biomass combustion. Slags accumulated on superheaters, which decrease thermal&nbsp;efficiency, often constitute complex combination of K-Ca-Mg-sulfates. However, thermodynamic&nbsp;properties of these sulfates and their combined effect with other phases, which will help to solve the&nbsp;fouling, slagging and high-temperature corrosion related problems in biomass combustion processes,&nbsp;are not well known. In this work, thermal stabilities including solubility limits of selected phases and&nbsp;phase mixtures in the MgSO₄-K₂SO₄-CaSO₄ system are both critically reviewed and experimentally&nbsp;studied. The obtained results are presented and discussed.</p>

Topics

• corrosion
• phase
• combustion
• Alkali metal