论文信息 - Field test of superheater corrosion in a CFB waste boiler: Part I

Field test of superheater corrosion in a CFB waste boiler: Part I – Metal loss characteristics

The corrosion was investigated on a superheater test coil in a CFB waste boiler. The alloys ranged from ferritic steel T22 to nickel-based Alloy 65 and the metal temperatures were between 460 and 540 °C. The thickness of the deposit was alloy and temperature dependent. The low-alloyed steels developed thick deposits at all temperatures while the deposit thickness increased with the temperature on the high-alloyed steels and the nickel-based alloy. The corrosion attack was alloy dependent and related to the deposit crest. The nickel-based Alloy 65 was preferentially attacked directly under the crest of the deposit while the other alloys were preferentially attacked at the edge. The corrosion rate increased with temperature for X20, Alloy 304L, Alloy 310 and Alloy 825; decreased on Alloy 65; and was bell shaped on T22 and Alloy 28. Alloy 310 suffered from severe pitting corrosion in a line following the edge of the deposit crest. The best overall corrosion resistant alloy was Alloy 28.

Petter Andersson | Mats Norell

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