Abstract
Biomass energy, as a reliable renewable energy source, has gained more and more attention. However, microstructure degradation and corrosion fatigue damage of heat pipes hinder its further application. In this paper, high temperature corrosion fatigue characteristics of 12Cr1MoV steel under a mixed alkali metal chloride salt environment and mixed sulfate salt environment were investigated. Fatigue tests with different total strain amplitudes were performed. Results show that the effect of total strain amplitude on the cyclic stress response of the alloy is approximately the same under three different deformation conditions. With the increase of the cyclic numbers, the alloyed steel mainly exhibited cyclic hardening during loading. The fatigue properties in air environment were the best, which is most obvious when the total strain amplitude is ±0.3%. The fatigue life of samples in mixed alkali metal salts is the shortest. Furthermore, the fatigue fracture morphology of the alloyed steel in different environments were also deeply analyzed. This experimental study attempts to provide a theoretical reference for solving the problem of rapid failure of heat pipes in biomass boilers, and to establish a scientific basis for the material selection and safety operation.
Highlights
As a kind of renewable energy, biomass energy has attracted considerable attention in recent years due to its rich resources and lower pollution
Alkali metal compounds in fuels tend to flow with flue gas at high temperatures, deposit on the wall of the superheater, and form alkali metal salt slagging with complex composition [2]
Part of the released sulfur is combined with oxygen to form SO2 gas, which is mixed with flue gas and discharged outside of the boiler The other part will deposit in the form of sulfate onto the inside of the boiler. These sulfates will react with the oxide film on the metal surface at high temperatures, which results in corrosion
Summary
As a kind of renewable energy, biomass energy has attracted considerable attention in recent years due to its rich resources and lower pollution. Alkali metal compounds in fuels tend to flow with flue gas at high temperatures, deposit on the wall of the superheater, and form alkali metal salt slagging with complex composition [2]. Part of the released sulfur is combined with oxygen to form SO2 gas, which is mixed with flue gas and discharged outside of the boiler The other part will deposit in the form of sulfate onto the inside of the boiler These sulfates will react with the oxide film on the metal surface at high temperatures, which results in corrosion. As a kind of high strength alloyed steel, 12Cr1MoV steel possesses excellent corrosion resistance and mechanical properties It is widely used in coal-fired boilers and biomass boiler heat pipes at temperatures below 600 ◦ C.
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