本文選題：天然氣管道　切入點：腐蝕　出處：《東北石油大學(xué)》2017年碩士論文

【摘要】：管道輸送是天然氣的最主要輸送方式,由于天然氣遇火易燃易爆,一旦管道失效斷裂,天然氣泄露到空氣中,接觸火源,容易引發(fā)災(zāi)難性的事故,因此管道結(jié)構(gòu)的完整至關(guān)重要。管道服役過程中,由于腐蝕、管體變形等缺陷是管道完整性受損,管道承壓能力下降,為管道失效造成安全隱患;為了防止管道失效,工程實際中常采用調(diào)節(jié)壓力,修復(fù)或更換管段等管道維護(hù)措施。合于使用評價正是以檢測的管道缺陷數(shù)據(jù)為基礎(chǔ),基于嚴(yán)格的理論分析和計算,確定含缺陷結(jié)構(gòu)的安全可靠度及結(jié)構(gòu)的剩余強(qiáng)度和安全服役壽命,為管道維護(hù)措施提供科學(xué)的參考依據(jù)。本文對管道的檢測數(shù)據(jù)進(jìn)行了分析,針對管道腐蝕缺陷,管道不良地質(zhì)條件引發(fā)的管體變形進(jìn)行了研究。首先,介紹分析目前較為常用的管道缺陷評價方法,然后基于這些方法建立了缺陷管道的有限元模型,計算得到了管道的受力變形,并基于相應(yīng)的應(yīng)力應(yīng)變判斷準(zhǔn)則,確定缺陷管道的剩余強(qiáng)度和安全狀況�；诟怕式y(tǒng)計的方法,根據(jù)開挖測量得到管道腐蝕深度,得到了腐蝕管道可靠度與剩余壽命曲線;基于蒙特卡洛法,對管道腐蝕受力進(jìn)行模擬,定量地給出了腐蝕管道的失效概率;最終確定了天然氣管道規(guī)定風(fēng)險水平條件下的腐蝕管道剩余壽命。本文的研究成果為天然氣管道的檢測、維修和更換工作提供了科學(xué)的決策意見。
[Abstract]:Pipeline transportation is the most important way to transport natural gas. Since natural gas is flammable and explosive in case of fire, once the pipeline fails and breaks, natural gas leaks into the air and contacts the source of fire, which can easily lead to catastrophic accidents. Therefore, the integrity of the pipeline structure is very important. During the pipeline service, due to the defects such as corrosion and deformation of the pipe body, the integrity of the pipeline is damaged, and the pressure bearing capacity of the pipeline is reduced, which causes the pipeline failure to cause a hidden danger of safety; in order to prevent the pipeline from failing, In engineering practice, pipe maintenance measures such as regulating pressure, repairing or replacing pipe sections are often adopted. The evaluation of pipeline defects is based on the measured data of pipeline defects, and based on strict theoretical analysis and calculation. The safety reliability, residual strength and service life of structures containing defects are determined, which provides a scientific reference for pipeline maintenance measures. This paper analyzes the inspection data of pipelines, and aims at the corrosion defects of pipelines. The pipe deformation caused by poor geological conditions of pipeline is studied. Firstly, the commonly used pipeline defect evaluation methods are introduced, and then the finite element model of defective pipeline is established based on these methods. The stress and deformation of pipeline are calculated, and the residual strength and safety condition of defective pipeline are determined based on the corresponding criterion of stress and strain. Based on the method of probability and statistics, the corrosion depth of pipeline is obtained according to excavation measurement. The curve of reliability and residual life of corroded pipeline is obtained, and the failure probability of corroded pipeline is quantitatively given by simulating the corrosion force of pipeline based on Monte Carlo method. Finally, the remaining life of corroded pipeline under the specified risk level of natural gas pipeline is determined. The research results in this paper provide scientific decision advice for the inspection, maintenance and replacement of natural gas pipeline.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE973

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本文編號：1679710