Operation of a Forced Circulation, Haynes Alloy No. 25, Mercury Loop to Study Corrosion Product Separation Techniques
TRW INC CLEVELAND OH MATERIALS TECHNOLOGY
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Haynes alloy No. 25 forced circulation, mercury loop was designed and operated for a total of 5218 hours at an average boiling temperature of 1097 deg F. Corrosion product separators were included in both the vapor and liquid sections of the system and were evaluated for their effectiveness in reducing problems associated with mass transfer in mercury systems. Corrosion data for this system were found to agree favorably with previously reported data for two-phase, thermal convection loops. The greatest attack was found in the low vapor quality regions of the boiling section, one isolated portion of the superheater inlet, and in the orifice and nozzle where condensation was occurring. The condenser and subcooler sections of the loop suffered negligible attack, as did the dry portions of the superheater. Deposition was observed in the loop and was greatest in the preheater section and in the orifice and nozzle where condensation was occurring. The action of the corrosion product separator located in the post-condenser region of the loop prevented deposition in the subcooler section. The vapor corrosion product separator was approximately 51 percent efficient in removing corrosion products carried over from the boiler. Operation of this loop for 5218 hours has demonstrated the feasibility of long-term operation of a Haynes alloy No. 2S mercury system.
- Properties of Metals and Alloys