Electrochemical techniques for on-line corrosion monitoring were used to study low-temperature corrosion of regenerative air preheaters in oil-fired power stations. The cause of metallic corrosion on the studied structure was condensation of sulfuric acid (H2SO4) from flue gas on the heat-exchanger surfaces. A corrosion probe was designed and installed. Results under various operating conditions were evaluated. Measurements obtained showed the dynamics of this industrial system and the benefits of real-time monitoring in understanding corrosion behavior of acid condensation.

Subject
Acids, Corrosion rate, Metal surfaces, Probes, Condensation, Flue gas, Natural gas, Metals, Corrosion probes, Oil, Elements, Linear polarization resistance, Cleaning
Keywords:
condensation, corrosion probe, electrochemical potential, heat exchanger, mild steel, noise, on-line monitoring, power stations, regenerative preheaters, sulfuric acid
NACE International
1996
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