| 管线钢在含氢气的煤制天然气中服役安全性评估 |
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| 作者姓名： | 赵德辉 徐庆虎 崔德春 李金许 褚武扬 李强 |
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| 作者单位： | 北京科技大学腐蚀与防护中心,北京,100083;中海油研究总院新能源研究中心,北京,100028 |
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| 基金项目： | 国家重点基础研究发展计划资助项目(2014CB643301)国家自然科学基金资助项目(51171024) |
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| 摘 要： | 煤制天然气是我国煤炭清洁利用的重要发展方向.现有管道用于输送煤制天然气(最高氢分压为0.72 MPa)时需要考虑其中低压氢气的影响,因而需先进行氢致开裂安全性评估.本文利用高压釜环境下恒载荷实验和电化学充氢,模拟研究X-70管线钢和20#钢在不同氢含量下的氢损伤和氢致延迟开裂,并对其在煤制天然气中服役安全性进行评估.在总压12MPa(10 MPa N2+2 MPa H2)的高压釜中放置一个月,两种钢的金相试样均不出现氢损伤,U弯试样不开裂,加屈服强度σs的恒载荷试样不发生断裂.在含0.72 MPa的煤制天然气中长期服役时,进入两种钢的氢含量均远低于σs下发生氢致延迟开裂的门槛氢含量和出现氢损伤的门槛氢含量,因而X-70钢和20#钢在煤制天然气中长期服役均具有高的氢损伤和氢致开裂安全系数.
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| 关 键 词： | 煤制天然气 管线钢 氢致延迟开裂 氢含量 安全系数 |
| 收稿时间： | 2015-07-08 |
Safety evaluation of pipeline steels under SNG containing H2 |
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| Affiliation: | 1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;2. New Energy Research Center, CNOOC Research Institute, Beijing 100028, China |
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| Abstract: | Synthetic natural gas(SNG) is an important developing direction of the clean utilization of coal. The present pipeline steel may cause hydrogen-induced delayed cracking when used to transit SNG due to the hydrogen partial pressure in SNG perhaps up to 0.72 MPa. Therefore,the safety assessment of pipeline steel for long-term service is very important and necessary. In this work,hydrogen damage and hydrogen-induced delayed cracking in X-70 pipeline steel and 20#steel at different hydrogen contents were studied by using autoclave constant load test and electrochemical hydrogen charging methods. The service safety of the steels in SNG was evaluated. There is no hydrogen damage in the two kinds of steel after being placed in the autoclave in which the total pressure 12 MPa(10 MPa N2+ 2 MPa H2) is kept for one month. Hydrogen-induced delayed cracking does not occur in the U-bending specimen. And the constant load samples do not fail after they are kept at the yield stress for one month. The hydrogen content entering into X-70 and 20# samples is much lower than the threshold hydrogen content for hydrogen-induced delayed cracking and that for hydrogen damage.Therefore,both X-70 steel and 20# steel have high safety factors during the long-term service of transiting SNG. |
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