Study on Corrosion of Superheater in the Biomass-fired Boilers
The corrosion failure tube sample from superheater in biomass-fired boiler was observed and studied by optical microscopy(OM), electron probe microanalysis(EPMA). The ash deposition was detected by XRD. The OM results showed that the corrosion was carried out along the grain boundary. The intergranular corrosion layer was about 5～12 grain in depth. The XRD results showed that ash deposition mainly consisted of KCl and SiO2 The results of elemental map of EPMA showed that chlorine and nickel element were found mainly at the metal/oxide interface. The corrosion mechanism was analysed as follows: the chlorine played an important role on corrosion. It penetrated the oxide layer and reacted with metal forming metal chlorides. The chlorides were oxidized under high oxygen partial pressure. The chlorine released in oxidation process would diffuse back to metal surface and reaction cycle upwards continued. The measures were also given in this paper.
biomass-fired boiler superheater intergranular corrosion
SONG Yun-jing SHI Wen-hua
Shandong electric power research institute, Jinan Shandong 250002, P.R.China
国际会议
沈阳
英文
35-38
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）