The heating surface of Russian-made power plants suffers various corrosion during the downtime and standby period

especially at the bending area of low temperature reheater inlet.Thus

this paper inspects the corrosion condition of the inlet pipes of low temperature reheater in a Russian-made unit

and optical microscope

electron diffraction spectrometer and X-ray diffraction analyzer were used to analyze the corrosion location

composition and morphology of the corrosion products.The results indicate that

the dissolved oxygen corrosion occurred during the laying up of the plant is the major reason for inlet pipes corrosion of low temperature reheater.Because the pipe materials

location structure and design are inaccordance with the actual installation

some condensation water will deposit in the inlet pipes of low temperature reheater during the unsuitable shutdown process.The corrosive ion Cl-and SO42-in the condensed water can promote the development of corrosion and the dissolved oxygen can induce the corrosion of pipes after the air leaked into the system.Therefore

during the shutdown process of the Russian-made unit

the production of condensed water in the low temperature reheater should be avoided

and necessary boiler stopshut down protective agent should be considered.