ボイラチューブ寿命管理のための材料試験・解析の効率化

概要

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Safety margins in boiler tube design are severely lowered by either local heating or corrosion during operation in some cases. For controlling the safety margins, it is popular to conduct metallographical inspection via replica, tube temperature measurement in doghouse and tube thickness measurement. Recently, electrochemical test and density measurement were proposed, which had been rarely applied previously due to the uncertainty in the correlation ship between material property change and life consumption. We made efforts to improve the conventional boiler tube life prediction method into a more practical one. The results obtained are summarized as follows: (1) The extrapolation program (error:0.8-1.2) developed in this study can estimate the creep-rupture strength of steels for decade-long use on the basis of test data up to 3000 hours. (2) y using the corrosion rate, the degree of local overheating and material deterioration data, the new program can estimate the residual life of boiler tubes in service in error of a factor of three. (3) The life prediction method was applied to four super heaters and one reheated. In two cases, the residual lives were found to be very short.
社団法人日本材料学会の論文
1988-03-15