| In order to improve the thermal power generating efficiency and reduce CO2 emissions, t he us e of ultra-supercritical thermal p ower u nits w ith high ope ration parameters has become the inevitable trend of China. The operation of high parameter ultra-supercritical unit put f orward hi gher r equirements on the safety of power generation equipment. However, because of the effect of manufacturing, welding and service p rocess, d efects su ch as cracks i nevitable ap pears i n t he main st eam p ipe which makes security risk under high temperature. Therefore, high temperature power plant main steam pipe life assessment expert system was developed for safety assessment and life prediction of high temperature main steam pipe without&containing defects in order to ensure the safety operation.In th is article, high t emperature tensile t est, hi gh t emperature e ndurance t est, single-axis creep test and creep crack growth tests were operated to obtain material properties required for the evaluation and expert system database was established. Expert system inference rule was established based on the evaluation methods and procedures of creep d amage, cr eep r upture and cr eep-fatigue without&containing defects of R5 " Assessment P rocedure f or t he H igh T emperature Response o f Structures". Object-oriented programming language Visual Basic was adopted for the structural design and code writing of expert system.High temperature power plant main steam pipe life assessment expert system consists of fl aw-recombination module, c reep da mage e valuation module, c reep rupture evaluation module and creep-fatigue evaluation module. The characteristics of expert s ystem are user-friendly, in teractive, easy-operated and good e xpansibility. Evaluation result can be achieved in a short time according to tip of the expert system which provided a basis for the safety management of thermal power main steam pipe in high temperature. |
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