埋地天然气管网土壤腐蚀的风险分析
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2020-04-16 19:39:32
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完整性管理朱庆杰等:埋地天然气管网土壤腐蚀的风险分析油气田地面工程http://www.yqtdmgc.com埋地天然气管网土壤腐蚀的风险分析*朱庆杰1胡士明1陈艳华2李雪1赵炫皓1万永华11常州大学石油工程学院2华北理工大学地震工程研究中心摘要:随着埋地天然气管网运行时间的增加,防腐材料逐渐老化和土壤环境的恶化,埋地天然气管网受土壤腐蚀的风险越来越大,给城市安全构成严重威胁。为了对埋地天然气管网土壤腐蚀作出准确的风险预测,分析了导致埋地天然气管网土壤腐蚀的五种主要影响因素:电阻率、氧化还原电位、含水量、含盐量、土壤pH值。通过计算五种风险评价因子的风险隶属度函数,得出各风险评价因子的风险指标,运用层次分析法计算五种风险评价因子的权重,从而得到埋地天然气管网土壤腐蚀的风险预测图像。根据计算结果,对埋地天然气管网土壤腐蚀作出风险预测,为埋地天然气管网的工程防护提供了依据。关键词:埋地天然气管网;土壤腐蚀;风险分析;层次分析法;风险隶属度函数RiskAnalysisofSoilCorrosioninBuriedNaturalGasPipelineNetworkZHUQingjie1,HUShiming1,CHENYanhua2,LIXue1,ZHAOXuanhao1,WANYonghua11PetroleumEngineeringDepartmentofChangzhouUniversity2EarthquakeEngineeringResearchCenterofNorthChinaUniversityofScienceandTechnologyAbstract:Withtheincreaseoftherunningtimeofburiednaturalgaspipelinenetwork,theagingofanti-corrosionmaterialsandtheintensificationofsoilenvironment,thesoilcorrosionriskofburiednaturalgaspipelinenetworkisincreasing,posingaseriousthreattourbansafety.Inordertomakeac-curateriskpredictionforsoilcorrosionofburiednaturalgaspipelinenetwork,fivemaininfluencingfactorscausingsoilcorrosionofburiednaturalgaspipelinenetworkareanalyzed,includingresistivity,redoxpotential,watercontent,saltcontent,andsoilpHvalue.Theriskmembershipfunctionoffiveriskassessmentfactorsiscalculatedtoobtaineachriskindexoftheevaluationfactor,andtheanalytichierarchyprocessisadoptedtocalculatetheweightoffiveriskassessmentfactors,soastoobtaintheriskpredictionimageofthesoilcorrosionofburiednaturalgaspipelinenetwork.Accordingtothecal-culationresults,theriskpredictionofthesoilcorrosionofburiednaturalgaspipelinenetworkisob-tained,whichprovidesbasisfortheengineeringprotectionofburiednaturalgaspipelinenetwork.Keywords:buriednaturalgaspipelinenetwork;soilcorrosion;riskanalysis;analytichierarchypro-cess;riskmembershipfunctionDOI:10.3969/j.issn.1006-6896.2019.09.022*基金论文:国家自然科学基金项目(51378172);江苏省高校自然科学重点项目(16KJA170004)。埋地天然气管网土壤腐蚀是指土壤的不同组分和性质对埋地天然气管网产生的腐蚀破坏现象,它是导致埋地天然气管网泄漏的重要原因之一[1]。埋地天然气管网土壤腐蚀主要有土壤电化学腐蚀、化学腐蚀、微生物腐蚀和杂散电流腐蚀[2]。由于土壤的组分和性质比较复杂,致使埋地天然气管网土壤腐
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