Critical Deposit Loading Thresholds for Under Deposit Corrosion in Steam Generators
نویسندگان
چکیده
Significant industrial facilities typically operate a steam system with multiple generators (or boilers) that are potentially vulnerable to under deposit corrosion (UDC). This mechanism begins the deposition of porous layer magnetite particles on waterside heat transfer surfaces. Beneath this layer, wick-boiling causes concentration contaminants (such as chlorides) until exceeds some critical threshold results in rapid corrosion. Industry practice mitigate risk includes monitoring extent and then chemically cleaning equipment before deposits reach level. One significant factor is flux, which drives both processes. paper investigates relationship between flux thickness for initiation chloride-driven UDC. Ex-service samples from have been examined, an electrochemical method has developed situ measurement loading, model used estimate local conditions beneath during progress For 1.0 Cr 0.5 Mo steel coils generator operating at approximately 75 bar(a) all volatile treatment regime, onset UDC was determined be 350 kW/m2, loading 50 mg/cm2, 95 µm, corresponding chloride 80 ppm at-temperature pH below ∼2.7.
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ژورنال
عنوان ژورنال: Corrosion
سال: 2022
ISSN: ['0010-9312', '1938-159X']
DOI: https://doi.org/10.5006/4085