The objective of the work was to investigate temperature impact on corrosion of air-preheater tubes of oil shale CFB boilers. With this objective in view, laboratory corrosion tests of carbon steel St 33 used for manufacturing of air-preheater tubes have been carried out in the atmosphere of air and water steam in the presence of oil shale ash in the temperature range of 75–110 °C. The results have shown that corrosion rate of the metal was maximal at the temperature of 90 °C and minimal at the temperature of 110 °C, which could be recommended as the operation temperature of the metal of air-preheater tubes of oil shale CFB boilers with respect to safe operation of tubes.
1. Ots, A., Gavrilov, A., Randmann, R. A study of fouling of low-temperature heating surfaces in burning Estonian oil shale // Teploenergetika. 1972. No. 11. P. 76–78 [in Russian].
2. RTM 108.030.116-78 Standards for Determination of Corrosive Resistance of Boiler Alloys at Elevated Temperatures [in Russian].
3. Arro, H., Prikk, A., Kasemetsa, J. Grain composition and corrosive activity of ash from CFB oil shale boiler // Oil Shale. 1997. Vol. 14, No. 3 Special. P. 225–235.
