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.

Based on the electro-hydraulic proportional system of a demolition robot working device, a simplified mathematical model was established by analyzing dynamic characteristics of the electro-hydraulic proportional valve, flow equation, the continuity equation and force equilibrium equations, and the fuzzy self-adaptive PID controller was designed to realize position control of working equipment. The simulations reveal that, compared with traditional PID, the fuzzy self-adaptive PID controller has these advantages such as smaller overshoot, good dynamic response and steady state performance.

Alloy 600 was studied in NaCl solution for its pitting corrosion behavior in this paper. According to Tafel polarization, impedance analysis, specimen morphological analysis and metal dissolving analysis by AAS, there must be selective de-alloy corrosion happened in localized concentrated environment; corrosion velocity reaches maximum when Cl- concentration was 100mmol/L.

The corrosion behaviour of 304SS in cooling water was studied through weight-loss method and electrochemistry measurements in different concentration ratio condition. The results obtained from this study showed that 304SS material was anti-corrosive with inhibitor when concentration ratio of circulating cooling water was 3 ~ 10, especially in CR 10 condition, and the advised CR running range was 3~10.

Automatic supervision of chemical dosing system was developed in fossil power plant by use of ADAM 6050 module and Advantech WebAccess. Communication configuration must be accorded with Bus protocol and device type; the system is confirmed to achieve stability and real-time performance after practical application.