CO2 压力对含杂质超临界CO2 输送管线X65钢应力腐蚀开裂敏感性的影响
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程璐瑶, 徐彦磊, 李家玮, 孙冲, 林学强, 孙建波
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Effect of CO2 Pressure on Stress Corrosion Cracking Susceptibility of X65 Pipeline Steel Used for Transporting Impure Supercritical CO2
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CHENG Luyao, XU Yanlei, LI Jiawei, SUN Chong, LIN Xueqiang, SUN Jianbo
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表2 不同CO2压力的含杂质超临界CO2环境中形成液膜中CO2及杂质组分和主要离子的质量与浓度
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Table 2 Total mass and concentration of CO2 and impurity components and the mass of main ions in the formed aqueous film calculated by OLI Analyzer Studio software
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| Chemical | 7.5 MPa CO2 | 10 MPa CO2 | 14 MPa CO2 |
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| substance | Mass / g | Mass fraction / % | Mass / g | Mass fraction / % | Mass / g | Mass fraction / % | | H2O | 7.000 × 10-4 | 95.635 | 3.500 × 10-4 | 95.027 | 1.000 × 10-3 | 94.595 | | CO2(aq) | 3.260 × 10-5 | 4.324 | 1.860 × 10-5 | 4.941 | 5.936 × 10-5 | 5.379 | | O2(aq) | 2.441 × 10-10 | 3.242 × 10-5 | 2.064 × 10-10 | 5.486 × 10-5 | 1.012 × 10-9 | 9.169 × 10-5 | | H2S(aq) | 8.805 × 10-9 | 1.169 × 10-3 | 4.650 × 10-9 | 1.236 × 10-3 | 1.359 × 10-8 | 1.232 × 10-3 | | NO2(aq) | 3.738 × 10-8 | 4.950 × 10-3 | 1.365 × 10-8 | 3.622 × 10-3 | 2.645 × 10-8 | 2.394 × 10-3 | | SO2(aq) | 1.936 × 10-7 | 7.224 × 10-3 | 7.954 × 10-8 | 5.455 × 10-3 | 1.863 × 10-7 | 3.948 × 10-3 | | H+ | 2.329 × 10-9 | 3.093 × 10-4 | 1.019 × 10-9 | 2.708 × 10-4 | 2.585 × 10-9 | 2.343 × 10-4 | | HCO | 8.425 × 10-9 | 1.119 × 10-3 | 5.471 × 10-9 | 1.454 × 10-3 | 2.052 × 10-8 | 1.860 × 10-3 | | HS- | 5.952 × 10-13 | 7.902 × 10-8 | 3.586 × 10-13 | 9.529 × 10-8 | 1.222 × 10-12 | 1.107 × 10-7 | | HSO | 1.761 × 10-7 | 2.339 × 10-2 | 7.468 × 10-8 | 1.985 × 10-2 | 1.806 × 10-7 | 1.637 × 10-2 |
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