首页|Failure analysis of reheater tubes in a 350 MW supercritical circulating fluidized bed boiler
Failure analysis of reheater tubes in a 350 MW supercritical circulating fluidized bed boiler
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NSTL
Elsevier
? 2022 Elsevier LtdThis work aimed to analyze a failure that occurred on the TP347H reheater tube in a supercritical circulating fluidized bed boiler from a thermal power plant. Optical microscopy (OM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), electron probe micro-analysis (EPMA), digital microhardness tester (DMT), X-ray fluorescence spectroscopy equipment (XRF), and carbon sulfur analyzer (CSA) were used to characterize the failed tubes. The results show that the cracks originated in the heat-affected zone and simultaneously propagated in the circumferential and radial directions. There is a multilayered structure in the crack under the effect of the thermal cycle and preferential oxidation. The failure mechanism was identified as stress corrosion cracking (SCC). The cracks were produced under the combined effects of the tensile stress and the high-temperature flue gas environment. Related improvement measures have been implemented to prevent further failures.
NSTL
Elsevier
