B-14 ガスタービン高温部品の損傷評価と寿命延伸技術(材料・構造,一般講演)

概要

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Gas turbine hot-gas-path components which include combustion liners, transition pieces, turbine nozzles, and turbine buckets are exposed to the hot gases discharged from the combustion systems and suffer from severe materials degradation and damages even in the early stage of the operations. Severity of the damages and degradations increases with increasing the inlet temperature and size of the gas turbines, which also increase the maintenance cost. The lifing of the components are, therefore, getting very critical issues. This paper presents what kinds of components damages and material degradations occur in the 1300℃-class heavy-duty gas turbines and then how we revise those component lives from original design life. Analytical-base assessment methods associated with condition-base assessment ones, some examples of assessment results, and component life extension technologies are also described.
2010-10-20