Jun 23, 2020 · The general measures to prevent high-temperature corrosion are: (1) increase the oxides of magnesium and calcium, which can interact with the components of high-temperature ash formation to produce high-melting compounds; (2) choose materials with good high-temperature corrosion resistance, generally overheating in Changsha Boiler Factory The
High Temperature Corrosion in Boilers - Bright Hub Engineering
Failure analysis of high temperature superheater tube (HTS
The formation of vanadium-sodium compounds destroys the protective scale and corrodes the external surface in high temperature. There are so many corrosion protection methods like coating, use of thicker material, higher grade of alloy with more Cr content and co extruded tubing to minimize the high temperature corrosion in boiler.
The boiler tubes used by Manjung Power Station are classified as high temperature superheater (HTS) tubes. Table 2 shows the details and operating conditions of high temperature superheater tube. The material used for this HTS tube is A213-T91 which is similar to modified 9Cr-1Mo steel.
High Temperature Corrosion - an overview | ScienceDirect
Apr 01, 2012 · Also, the literature handling bromine-related high temperature corrosion is scarce. The possible influence of bromine on corrosion in waste incinerators was raised in the report by Rademakers et al. . The problem of metals reacting with halogen gases (HCl, Cl 2,
A known corrosive agent is the vanadium in some oils. The ash in boilers can contain up to 4070% vanadium pentoxide, V 2 O 5, which causes corrosion when the metal surface temperature is 580650 °C. Often high-temperature corrosion is concentrated on the windward side of the tube (the side facing the incoming flue gas).
Sep 23, 2009 · High temperature corrosion in a boiler firing coal is mainly caused due to the presence of impurities like sulphur, alkali metals and chlorine. In fuel oil fired boilers, the main impurities are vanadium, sulphur, sodium, and chlorine. During combustion, these elements combine to form various types of vapors and condensed phases.
Abstract. There are essentially three distinct high temperature corrosion problems in fossil fuel fired steam boilers. These are: (1) corrosion of the superheaters and reheaters due to the deposition of fuel impurities, principally alkali metal sulfates in the case of coal-fired boilers and vanadium pentoxide in the case of oil-fired units. (2) Corrosion of the waterwalls in the furnace enclosure, due to the establishment of low oxygen activity regions near the walls.