Analysis of Cracking Cause of Molten Salt Pipeline in a 150 MW Tower Photothermal Power Plant
The molten salt pipeline of a 150 MW tower photothermal power plant was cracked and leaked.The cracking cause of the pipeline was analyzed by means of macroscopic morphology observa-tion,chemical composition analysis,tensile property test,impact property test,Vickers hardness test,metallographic analysis,fracture morphology analysis,micro-area composition and other methods.The results show that the failure mode of molten salt pipeline belongs to thermal fatigue cracking,which origi-nates from the fusion zone of the outer wall of the pipeline at the root of the fillet weld.The main reason for pipeline cracking is the alternating thermal stress generated between the protective plate and the pipe-line during the temperature change of the pipeline medium.
photothermal power stationmolten salt pipelinethermal fatigue cracking
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