Abstract
The selection of appropriate heat-resistant materials which are at the same time resistant to atmospheres rich in chlorine and its compounds is one of the most important current construction problems in steel boiler elements when using biomass fuels of agricultural origin. In the research presented here, an area was identified in the furnace of a 10 kW boiler where there was a potential risk of chlorine corrosion. This zone was determined based on numerical analysis of the combustion process; it is the zone with the highest temperatures and where the gas atmosphere conducive to the formation of chlorine corrosion centers. Subsequently, tests were carried out in the process environment of the combustion chamber of a 10 kW boiler (the fuel was barley straw) by placing samples of eight construction materials in a numerically-designated zone. These included samples of steel (coal boiler St41K, heat-resistant H25T and H24JS, and heat-resistant valve 50H21G9N4) as well as intermetallic materials based on phases (FeAl, Fe3Al, NiAl, and Ni3Al). The samples remained in the atmosphere of the boiler furnace for 1152 h at a temperature of 750–900 °C. After this time, the surfaces of the samples were subjected to SEM microscopy and scanning analysis. The results showed that the St41K boiler steel was not suitable for operation under the assumed conditions, and that a thick layer of complex corrosion products was visible on its surface. The least amount of corrosion damage was observed for the samples of 50H21G9N4 steel and intermetallic materials.
Highlights
One of the most important directions for the development of renewable energy is the rational diversification of the use of various energy-generation technologies
The current problem related to the construction of the steel elements of a domestic boiler lies in the selection of appropriate materials
Resistance tests on four grades of steel and four types of intermetallic materials, all placed in the zone of the highest temperature of a 750–900 ◦C boiler furnace, where chlorine corrosion may appear, showed that:
Summary
One of the most important directions for the development of renewable energy is the rational diversification of the use of various energy-generation technologies. There is more and more talk about energy based on hydrogen fuel (i.e., blue, gray and green hydrogen), and the discussion of the technologies for producing these fuels is only beginning. For this reason, it is too early to look for rational justifications for the use of hydrogen fuel in municipal or industrial energy. It is too early to look for rational justifications for the use of hydrogen fuel in municipal or industrial energy It is all the more difficult when it comes to prosumer (or home) energy. The need to use traditional technologies based on solid biomass fuels remains
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