International Sugar Journal

Backend corrosion in bagasse – coal fired boilers with particular reference to cogeneration † [Full subscriber]

Low temperature corrosion is experienced in an operating boiler when metal temperatures drop below the acid dew point (ADP) of the flue gas. H2SO4 and HCl are the acids which contribute most aggressively to corrosion. Both these acids can be produced when burning bagasse and trash. The H2SO4 ADP is largely dependent on the sulphur content of the fuel which mostly oxidises to SO2 during the combustion process and on the proportion of SO2 that converts to SO3. SO3 in turn converts to H 2SO4 as the gas cools from about 400°C down to about 175°C. Chlorine in the fuel…

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