页岩气脱水装置重沸器烟火管失效分析与对策研究OA

To ensure the critical role of reboiler fire tubes in natural gas dehydration units,a systematic analysis of typical failure cases is conducted to reveal failure mechanisms and reduce the impact of failures during operation.The failure analysis is conducted through macroscopic morphology inspection,microscopic morphology inspection,corrosion product analysis,material chemical composition analysis,mechanical property testing,and simulation modeling.The study finds that the right-angle bend of the reboiler fire tube is a high-temperature region where high-salt mineral flowback liquids form scale on the outer wall.Internal wall scaling combined with external deposits leads to decreased heat transfer efficiency and increased tube temperature,causing plastic deformation.Cracks initiate at the right-angle bend of the fire tube due to the coupled effects of corrosion,plastic deformation,and stress.Stress concentration at crack tips further exacerbates corrosion,promoting crack propagation and ultimately resulting in cracking near the weld heat-affected zone.The results provide a reference for the design improvement and safe operation of similar devices.