摘要
为研究SS316L在煤炭地下气化工程粗煤气集输系统高温高压临氢环境的适应性,分析了SS316L在特定工况下的腐蚀风险,指出SS316L在氢损伤和高温H_(2)/H_(2)S腐蚀方面目前暂无试验数据支撑,且在该工况下可能存在应力腐蚀开裂。高温H_(2)/H_(2)S腐蚀挂片试验显示SS316L在高温H_(2)/H_(2)S环境下呈均匀腐蚀,腐蚀速率较低且无明显氢损伤;通过模拟工况下的四点弯曲试验,观察到SS316L产生氯化物应力腐蚀开裂微裂纹。因此,提出SS316L主要失效风险是氯化物应力腐蚀开裂,并就材料适应性研究给出建议,可为煤炭地下气化粗煤气集输系统的选材提供参考。
To study the adaptability of SS316L as a raw gas gathering system material in high temperature and high pressure environment for underground coal gasification,corrosion risk analysis of SS316L under specific working conditions was carried out.It was highlighted that test data was not available for SS316L in terms of hydrogen damage and high temperature H_(2)/H_(2)S corrosion.Furthermore,elevated risk of stress corrosion cracking for SS316L should be considered under the specific working condition.High temperature H_(2)/H_(2)S corrosion coupon test showed that SS316L exhibited uniform corrosion under high temperature H_(2)/H_(2)S environment,with a low corrosion rate and no obvious hydrogen damage.Micro chloride stress corrosion cracks were observed after four-point bending test under simulated working condition.It was concluded that the major failure risk for SS316L should be chloride stress corrosion cracking,and recommendations regarding further research on gathering system material selection were given,which provided reference for selection of gathering pipeline material for raw gas from underground coal gasification.
作者
王雅熙
李林辉
陈宇
张金钟
WANG Yaxi;LI Linhui;CHEN Yu;ZHANG Jinzhong(CPECC Southwest Company,Chengdu,Sichuan,610041,China;CPECC Engineering Technology R&D Center,Beijing,100120,China)
出处
《天然气与石油》
2022年第4期119-126,共8页
Natural Gas and Oil
基金
中国石油天然气股份有限公司重大科技攻关项目“煤炭地下气化关键技术研究与先导试验”(2019E-25)。