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00263 EFFECT OF STATIC STRESS ON HIGH TEMPERATURE CORROSION BEHAVIOR OF BOILER TUBES IN WASTE INCINERATION ENVIRONMENT

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Product Number: 51300-00263-SG
ISBN: 00263 2000 CP
Author: Masaki Uekado, Yuji Kamei, Masanori Nakamura, Takuo Hosoda
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In superheater tubs of high-efficiency waste-to-energy plants, high temperature corrosion may occur when molten salt containing chlorides or sulfates is formed in the ashes deposited on the fireside tube surface. In addition, if residual stress exists in bent or welded parts, high temperature corrosion may be accelerated or stress corrosion cracking may be caused by the presence of the molten salt. In order to investigate the effect of static stress on the high temperature corrosion, stress corrosion cracking tests were conducted in actual refuse ash and synthetic refuse ash at 550°C under static stress applied by the constant load method. When buried in synthetic refuse ash containing 20mass% chlorine under a 0.2% proof stress load condition at 550°C, the Type 304 specimen was fractured by intergranular stress corrosion cracking after 10 hours. For 310HCbN and alloy 625, the specimens exhibited no cracJdng up to 300 hours. However, the maxinun intergranular corrosion depth of 310HChN increased as applied stress was increased. Also, as the chlorine concentration in the refuse ash was increased both the maximum intergranular corrosion depth and the maximum corrosion thickness loss tended to increase. Keyword: high-efficiency waste-to-energy plant, superheater, high temperature corrosion, st/ess corrosion cracking, intergranular corrosion, molten salt
In superheater tubs of high-efficiency waste-to-energy plants, high temperature corrosion may occur when molten salt containing chlorides or sulfates is formed in the ashes deposited on the fireside tube surface. In addition, if residual stress exists in bent or welded parts, high temperature corrosion may be accelerated or stress corrosion cracking may be caused by the presence of the molten salt. In order to investigate the effect of static stress on the high temperature corrosion, stress corrosion cracking tests were conducted in actual refuse ash and synthetic refuse ash at 550°C under static stress applied by the constant load method. When buried in synthetic refuse ash containing 20mass% chlorine under a 0.2% proof stress load condition at 550°C, the Type 304 specimen was fractured by intergranular stress corrosion cracking after 10 hours. For 310HCbN and alloy 625, the specimens exhibited no cracJdng up to 300 hours. However, the maxinun intergranular corrosion depth of 310HChN increased as applied stress was increased. Also, as the chlorine concentration in the refuse ash was increased both the maximum intergranular corrosion depth and the maximum corrosion thickness loss tended to increase. Keyword: high-efficiency waste-to-energy plant, superheater, high temperature corrosion, st/ess corrosion cracking, intergranular corrosion, molten salt
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