Method for evaluating life extension of key pressure-bearing part of thermal power overdue service unit

Abstract

The invention relates to a method for evaluating the life extension of a key pressure-bearing part of a thermal power overdue service unit. The evaluating method comprises the following steps: (1) concluding basic operation factors of the unit; (2) answering key questions of a pressure-bearing part to be subjected to life evaluation and the unit where the pressure-bearing part is located accordingto the basic operation factors concluded in the step (1); (3) evaluating the residual life of the pressure-bearing part according to the answer condition in the step (2), wherein the life evaluationin the step (3) comprises first-stage evaluation, second-stage evaluation and third-stage evaluation. The invention discloses a method for evaluating the life extension of the key pressure-bearing part of the thermal power overdue service unit. The method can be used for evaluating the service life extension of the key pressure-bearing part of the thermal power overdue service unit, the problems of uncertainty and inspecificity of an existing method for evaluating the service life extension of a key pressure-bearing part of domestic thermal power generating unit operation license continuationargumentation are solved, and the service life extension of the thermal power generating unit (equipment) part is more comprehensive, reasonable and economical.

Description

technical field [0001] The invention belongs to the technical field of the demonstration of the continuation of the operation license of a thermal power unit, and in particular relates to a method for evaluating the life extension of a key pressure-bearing component of a thermal power unit with overdue service. Background technique [0002] Since thermal power unit components are designed for conventional strength rather than limited life, it is generally impossible to give the exact design life of unit components. For pressure-bearing components, the wall of the component is determined by its pressure, temperature, allowable stress of the material, and geometric structure. thick. The design life of a thermal power unit is generally set at 30 years, and the operating time of more than 30 years is an overdue service unit. Many units in the world have been in operation for more than 30 years and are still in normal operation, indicating that the potential life of thermal powe...

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to propose a life extension evaluation method for key pressure-bearing components suitable for thermal power units with extended service, so as to solve the current domestic thermal power unit operation license renewal process. More comprehensive, reasonable and economical life extension of unit (equipment) components

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