Research and evaluation of T91 superheater material for high temperature corrosion in biomass power plants

Abstract

Purpose -The purpose of this paper was to evaluate corrosion resistance of superheater T91 material based on high temperature corrosion experiments with a condensate environment. Design/methodology/approach -The contributions of water temperature, chloride concentration and corrosion time were considered and analyzed for modeling corrosion kinetics. The corrosion tendency also was predicted, and the results were compared with higher temperature exposures of T91 tube material installed in a biomass power plant. Findings -High temperature exposure tests showed that the corrosion rates of T91 material would increase with temperature; there was a very evident corrosion acceleration point in 110°C. It was concluded that dimensional homogeneity analysis can serve as a viable evaluation method for T91 superheater material. Originality/value -Dimensional homogeneity analysis was used as evaluation method for anti-corrosion performance of T91 superheater material.

The high-temperature mechanical properties of HS110S steel and its corrosion behaviors in harsh downhole environment

“…The increase in temperature accelerates the chemical reaction, electrochemical reaction and mass transfer process, which in turn accelerates the occurrence of corrosion (Zhang et al , 2015; Huang et al , 2021). Srinivasan proposed a ratio ofP(CO 2 )/P(H 2 S), and expressed that the value is less than 200, H 2 S is a dominant factor in the corrosive environment.…”

“…The ratio in this work is about 147:1, thus it can be inferred that H 2 S controls the corrosion process (Rebak and Perez, 2017), the corrosion scales could be mainly FeS x . The corrosive gas is dissolved into the solution, the corrosive ions are generated, including HS − , S 2− , CO 3 2‐ and HCO 3 − ions (Xia and Luo, 2019; Zhang et al , 2015). The main cathode reaction is hydrogen evolution.…”

“…According to the survey, scholars across the world have made great achievement in the corrosion of CO 2 and H 2 S. It was found that the CO 2 /H 2 S corrosion was mainly affected by gas partial pressure, temperature, pH, fluid flow rates, medium, material and other factors (Yan et al , 2015; Zhang et al , 2015). However, the application research of sulfur-resistant steel at 350°C has not been found.…”

Study on the Corrosion Fatigue Properties of 12Cr1MoV Steel at High Temperature in Different Salt Environments

“…As a kind of renewable energy, biomass energy has attracted considerable attention in recent years due to its rich resources and lower pollution. However, most of the biomass fuels generally contain a large number of alkali metals, alkaline earth metals, sulfides, and chlorine elements with high concentration [1]. Alkali metal chlorides and sulfides are the main compounds produced during biomass combustion.…”