7/28/2019 Evaluation of Remaining Corrosion Fatigue Life for High-Pressure Hydrogenation Cracking Reactor

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Evaluation Of Remaining Corrosion Fatigue L ife For High-pressure Hydrogenation Cracking

Reactor

Posted on:2008-01-16 Degree:Master Type:Thesis

Country:China Candidate:D H Cheng Full Text:PDF

GTID:2121360218452286 Subject:Safety Technology and Engineering

Abst rac t/Su mmary: Order a copy of this thesis

Fatigue failure is the main failure mode for the hydrogenation reactor that not only works under the hightemperature, high pressure and alternation loading condition over a long period of time, but also works underthe bad environment that is filled of the Hydrogen . One kind of fatigue failure that often appears is corrosionfatigue. The fatigue of structure is such a complicated phenomenon affected by many uncertainties that it isnecessary to analyze the structural fatigue from the point of probability and statistics. As a branch of fracturemechanics, the various parameters affecting the fatigue propagation are considered as randomized. It is an

effective and new method to evaluate the structural fatigue reliability by Probabilistic Fracture MechanicsApproach.Firstly, the paper is aimed at the characteristic of hydrogenation reactors made of 2.25 Cr-Mo steel,and analysis the common defect that include hydrogen attack, temper embrittlement, stress cracking, weldoverlay removal and so on. The paper draw up the different fault tree for different defect, and provide the basistheory of safe using and science detecting to the reactorThen, the object of the present paper was to study the

relationship between corrosion fatigue crack growth rate da/dN and stress intensity factor amplitudeK of2.25Cr-Mo steel by corrosion fatigue crack growth rate experiment in Hydrogen solution. This steel is thetypical material used in chemistry and oil chemistry equipment. Corrosion fatigue safety assessment methodof hydrogenation reactor with defects in service could be explored and investigated.Finally, Monte-Carlomethod is used to predict corrosion fatigue crack growth rate and remainder life. And the influences of therandom parameters on corrosion fatigue propagation are discussed. The paper give the corrosion fatiguecrack growth rate of 2.25Cr-Mo steel under the different hydrogen pressure and temperature. The paper givea new stochastic crack propagation model using Monte-Carlo method, numerical examples are shown, theresults review the developed method is applicable.

Keywords/Search Tags:propagation life of fatigue, corrosion fatigue, hydrogenation reactor, faulttree, corrosion fatigue crack growth rate, remainder lif e, Monte-Carlomethod

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