Abstract
Domestic gas-steam combined cycle units start and stop frequently, and the load changes greatly, which accelerate the expansion of defects, such as fatigue, cracks, and organizational deterioration of metal components. In view of the problems caused by the material selection characteristics of gas-steam combined cycle units and the daily shutdown mode, several common typical cases of gas-steam combined cycle units are analyzed, such as compressor blade fatigue fracture, main steam combined valve body fatigue cracks, pipeline and pressure vessel weld fatigue cracks. As well, the gas-steam combined cycle unit metal supervision content and inspection emphasis are studied and supplemented.
Highlights
Gas-steam combined cycle units have been developed rapidly in eriod, high thermal efficiency, fast start-up, and low emission pollution[1]
Most domestic gas-steam combined cycle units are in peak-shaving operation
Due to the structure difference of waste heat boilers and steam turbines with coal-fired unit the selection of metal components and the failure modes of operation damage of combined cycle units are unique
Summary
Gas-steam combined cycle units have been developed rapidly in eriod, high thermal efficiency, fast start-up, and low emission pollution[1]. Most domestic gas-steam combined cycle units are in peak-shaving operation. The metal supervision of gas-steam combined cycle units has not been carried out systematically and deeply for the lack of exclusive standard criterion. It refers to the actual implementation of coal-fired units, the failure modes and supervision points of metal components are significantly different from those of coal-fired units. In this work, our work provided a reference for the development of the industry standard based on analyzation of the gassteam combined cycle units in recent years metal supervise application
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