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99257 CORROSION OF SCWO CONSTRUCTIONAL MATERIALS IN CL- CONTAINING ENVIRONMENTS

Picture for 99257 CORROSION OF SCWO CONSTRUCTIONAL MATERIALS
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Product Number: 51300-99257-SG
ISBN: 99257 1999 CP
Author: D.B. Mitton, Y.S. Kim, J.H. Yoon, S. Take and R.M. Latanision
Industries: Energy Generation , Materials Selection and Design
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There is a need to destroy both military and civilian hamdous waste and an urgency, mandafed by public concern over traditional waste handling methodologies, to identify safe and efficient alternative technologies. One very effective process for the destruction of such waste is supercritical water oxidation (SCWO). By capitalizing on the properties of water above its critical point, (374°C and 22.4 MPa for pure water), this technology provides rapid and 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. Signifcant weight loss and localized effects, including stress corrosion cracking (SCC) and dealloying, are seen in chlorinated environments. The current paper assesses the corrosion characteristics of various alloys exposed to high supercritical temperatures in a chlorinated feed stream containing salts. Keywords: Supercritical water oxidation, high temperature corrosion, nickel-base alloys, intergranular corrosion
There is a need to destroy both military and civilian hamdous waste and an urgency, mandafed by public concern over traditional waste handling methodologies, to identify safe and efficient alternative technologies. One very effective process for the destruction of such waste is supercritical water oxidation (SCWO). By capitalizing on the properties of water above its critical point, (374°C and 22.4 MPa for pure water), this technology provides rapid and 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. Signifcant weight loss and localized effects, including stress corrosion cracking (SCC) and dealloying, are seen in chlorinated environments. The current paper assesses the corrosion characteristics of various alloys exposed to high supercritical temperatures in a chlorinated feed stream containing salts. Keywords: Supercritical water oxidation, high temperature corrosion, nickel-base alloys, intergranular corrosion
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