Corrosion damage in Waste Heat Boilers; Major root causes and remediation

摘要

The crucial factor determining damages of high-pressure waste heat boilers in ammonia plants are fouling of the boiler tube surface with magnetite (Fe_3O_4) in combination with exceptionally high local heat fluxes.rnThe main reasons for the magnetite fouling arern(ⅰ) Flow Accelerated Corrosion (FAC) in the preboiler /feed water system (ⅱ) First Condensate Corrosion (FCC) in steam and condensate equipment (ⅲ) Ineffective chemical cleaning and conditioning programs for the boilersrnThe main goal of boiler water treatment programs should be to keep the boiler heat transfer surface free from deposits. Conventional chemical treatment programs are not always successful. Polyamine treatment can offer an alternative approach.