This paper studies the characteristics of superheater tubes in biomass direct-fired boilers through corrosive thinning and kinetic analysis, corrosion product analysis and the effect of HCI concentration. The experimental results show that the corrosion resistance of TC4 tube materials is good; the corrosion resistance of pure titanium tube is relatively poorer compared with the former; the tube with higher nickel content have better corrosion resistance. Therefore, in the selection of materials for superheater tubes of biomass direct-fired boilers, it is necessary to select tubes with higher nickel content to prolong the service life of superheaters.
