| 摘要 |
PROBLEM TO BE SOLVED: To rapidly and properly evaluate a lifetime of a furnace wall simply and at a low cost by an analytical method, in a method for evaluating a life of a tube for a boiler furnace wall pipe having a combustor that there is possibility to generate hydrogen sulfide at a combustion process for heavy oil and coal. SOLUTION: By multiplying a low cycle fatigue strength of a material for a boiler furnace wall pipe in the atmospheric air, being an object to be evaluated, by a reduction factor of the fatigue strength of the material in hydrogen sulfide-contained gas, a fatigue curve under hydrogen sulfide environment is determined. From the fatigue curve and a maximum strain range of the material in a relvant portion, the number of cycles until the occurrence of pipe damage, such as groove-form corrosion, is determined. With the numerical value thus obtained, a state of the damage of the pipe is decided and evaluated to perform lifetime evaluation, and this way reduces an inspection cost.
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