Abstract
In order to accomplish the high-efficiency electric power generation for waste-to-power plant, further increase in both high-temperature and high-pressure steam conditions of the boiler superheater tube is strongly required. There is a significant problem of hot corrosion in the higher temperature and pressure boilers, in which the complicated corrosion by virtue of both molten salt caused from mainly chlorides and/or sulfates and chloride-rich gas brings about the corrosion-induced severe thickness loss for the superheater tube material. Therefore, preventing of hot corrosive damage is urgent problem to be solved. Present study was conducted to inspect the effect of the natural zeolite powder addition into the flue gas on the corrosion inhibition by means of various techniques such as the electrochemical and X-ray analyses for the characterization of deposited ash and oxide scale constituents. Natural zeolite powder was found to be so effective corrosion mitigation of deposited ash through catching up the corrosive species such as potassium and chlorine as to enhance the formation of protective Cr-rich oxide scale and therefore improve the corrosion resistance of the superheater tube material.
