Discussion on a rational laboratory corrosion test method for evaluation of hot corrosion resistance of boiler materials for high efficiency waste-to-energy plants

摘要

Establishment of a rational and simple laboratory corrosion test method that allows reproduction of actual plant environment is desired for the evaluation of hot corrosion resistance of superheater tube materials for high efficiency waste-to-energy plants. A simple gas-atmosphere control was used, in which a gas generated from a sample ash was contained and the effect of the gas components was utilized. A hot corrosion test was conducted with varying amounts of ash deposit and test durations. Corrosion damages were analyzed to evaluate effectiveness of the test as a laboratory standard test. The results showed that the environment of actual plants could be reproduced more precisely by the gas filling test than by the open air test. The mass loss tended to be larger in the application method than in the embedding method that has a larger amount of ash deposit. The mass loss tended to increase with the progress of the test. Because high alloy steel has a certain amount of corrosion latency, however, a test duration of about 200 hours is required.