High Temperature Corrosion of Particulate Matter During Msw Combustion: Effects of Particle Size, Inorganic Minerals and Additives on Corrosion Rates and Mechanisms

Abstract

The high-temperature corrosion experiment of particulate matter (PM) showed that the corrosion rate of 304 stainless steel increases significantly as the particle size decreases. The corrosive ability of PM1 on 304 stainless steel was about 3-5 times higher than that of PM10+ at 600°C. The additives can greatly restrain the corrosiveness of PM. After 5% of kaolin was added, the corrosion ability of the PM generated by MSW combustion on 304 stainless steel was reduced by 12%. When the stable heated surface slag layer and ash deposit layer formed, the corrosion control efficiency was increased to 71%. In addition, this study analyzed the high temperature corrosion products of PM and 304 stainless steel. It was found that the high-temperature corrosion process of PM was mainly dominated by NaCl, KCl, CaCl2, Na2SO4 and K2SO4, the corrosion of alkali and alkaline earth chloride was generally stronger than that of sulfate at 600°C. Finally, the corrosion mechanism of corrosion cracking, pitting corrosion, molten salt corrosion process in which alkali chloride and sulfate coexist was also discussed.

Keywords: MSW, particulate matter (PM), alkali, additive, corrosion