CORROSION OF AIR PREHEATER TUBES OF OIL SHALE CFB BOILER. PART II. LABORATORY INVESTIGATION OF TEMPERATURE IMPACT

摘要

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.