High temperature corrosion memory in a waste fired boiler – Influence of sulfur

High-Temperature Corrosion Behavior of Selected HVOF-Sprayed Super-Alloy Based Coatings in Aggressive Environment at 800 °C

“…Some other major aggressive substances known for their negative attribution to hot corrosion process are chlorides and vanadates [ 7 , 8 ]. A major role in the formation of highly corrosive sulphates is played by sulphur; papers [ 21 , 22 ] discuss some aspects of the role of sulphur and its contribution to corrosive processes in high-temperature environments.…”

“…In MCrAlY(X) alloys, M stands either for Ni, Co, or both, where X is a minor alloying element, such as Re, Ta, Si, Hf, or often their combination. In recent decades, many scientific papers have been written on the topic of MCrAlY(X) hot corrosion resistance in many applications, e.g., coal-fired boilers [ 7 , 8 ], waste-to-energy boilers [ 18 , 19 , 22 ], biomass boilers [ 1 , 11 , 20 ], gas turbines [ 15 , 16 ], etc. In the experiment presented in this paper, several commercial MCrAlY(X) coatings deposited by HVOF technology are compared.…”

“…In addition to these coatings, two conventional base materials that are commonly used for heat exchange tubes and firewalls of power plants are also tested—steel P91 and alloy 800 H. The aim of this study is to present a specific comparison of the potential benefits of increased corrosion resistance when using a coating in critically corroded areas of combustion plant heat exchanger surfaces compared to the corrosion resistance of the aforementioned conventional base materials of said components. The corrosive environment for the test is a salt mixture of 75% Na 2 SO 4 and 25% NaCl, which is a simplified corrosive environment typical for the combustion chamber and flue gas path in energy producing boilers [ 1 , 6 , 7 , 8 , 11 , 19 , 21 , 22 , 23 ].…”