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98414 CORROSION Mitigation IN SCWO SYSTEMS FOR HAZARDOUS WASTE DISPOSAL

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Product Number: 51300-98414-SG
ISBN: 98414 1998 CP
Author: D.B. Mitton, S-H Zhang, M.S. Quintana, J.A. Cline, N. Caputy, P.A. Marrone, R. Latanision
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There is a need to destroy both mititary and civilian hazardous and an urgency, mandated by public concern over traditional waste handfing methodologies, to identify safe and efiicient attemative technologies, One very effective process is the destruction of such waste is supercritical water oxidation (SCWO). By capitalizing on the properties of water above its critical point (374°C and 221 atm for pure water), this technology provides rapid d complete oxidation with high destruction efficiencies at typical operating temperatures. Nevertheless, corrosion of the materials of fabrication is a serious concern. While nickel and nickel-based alloys are generally considered important for severe service applications, results from laboratory and pilot-scale SCWO systems presently in operation indicate that they will not withstand some aggressive feeds. Significant weight loss and localized effects, including stress corrosion cracking (SCC) and dealloying, are seen in chlorinated environments. Ultimately, the practicality of SCWO may be limited by the abiiity to mitigate or predict corrosion damage. This paper assesses the recurring failure of Alloy C-276 heater tubes that displayed cracking during SCWO experiments employing dilute methylene chloride feed solutions. An attempt has been made to correlate the failure mode to the results generated during a controlled experiment employing a nominally identical Alloy C-276 tube instrumented with thermocouples. The results reveal the importance of both shess and temperature and indicate a restricted temperature region within which corrosion is most severe. Keyword supercritical water oxidation, high temperature corrosion, Afloy C-276, dealloying, stress corrosion cracking, intergranular corrosion, intergranular stress corrosion cracking
There is a need to destroy both mititary and civilian hazardous and an urgency, mandated by public concern over traditional waste handfing methodologies, to identify safe and efiicient attemative technologies, One very effective process is the destruction of such waste is supercritical water oxidation (SCWO). By capitalizing on the properties of water above its critical point (374°C and 221 atm for pure water), this technology provides rapid d complete oxidation with high destruction efficiencies at typical operating temperatures. Nevertheless, corrosion of the materials of fabrication is a serious concern. While nickel and nickel-based alloys are generally considered important for severe service applications, results from laboratory and pilot-scale SCWO systems presently in operation indicate that they will not withstand some aggressive feeds. Significant weight loss and localized effects, including stress corrosion cracking (SCC) and dealloying, are seen in chlorinated environments. Ultimately, the practicality of SCWO may be limited by the abiiity to mitigate or predict corrosion damage. This paper assesses the recurring failure of Alloy C-276 heater tubes that displayed cracking during SCWO experiments employing dilute methylene chloride feed solutions. An attempt has been made to correlate the failure mode to the results generated during a controlled experiment employing a nominally identical Alloy C-276 tube instrumented with thermocouples. The results reveal the importance of both shess and temperature and indicate a restricted temperature region within which corrosion is most severe. Keyword supercritical water oxidation, high temperature corrosion, Afloy C-276, dealloying, stress corrosion cracking, intergranular corrosion, intergranular stress corrosion cracking
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