面向碳捕获与封存的超临界CO2输送管道腐蚀特性及预测模型研究

With the large-scale development of carbon capture and storage (CCS) technology, the internal corrosion problem of supercritical CO2 transport pipeline with impurity has become the bottleneck of its application. The characteristics of numerous impurities, changeable phase and complex corrosion process in supercritical CO2 transport pipeline lead to the limitation of understanding the corrosion problem in supercritical CO2 pipeline with impurity. Therefore, it is necessary to find out the corrosion mechanism of supercritical CO2 pipeline and corrosion prediction model in complex corrosive environment. These researches studies the influence of gas impurity, water content and fluid velocity on the corrosion behavior of supercritical CO2 transport pipeline by simulating the corrosion environment of supercritical CO2 transport pipeline, and obtain the corrosion rule of supercritical CO2 transport pipeline. The corrosion mechanism of supercritical CO2 transport pipeline with impurity is revealed by using advanced analytical techniques such as scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and Raman spectroscopy. The corrosion prediction model of supercritical CO2 transport pipeline under the synergistic effect of water content, gas impurity and fluid velocity is established based on the corrosion experiment. This research is prominent in scientific understanding of the corrosion evolution mechanism of supercritical CO2 transport pipeline with impurities in CCS process, which provides a theoretical basis for corrosion control, safe transportation of supercritical CO2 transport pipeline and the application of CCS technology.

随着碳捕获与封存（CCS）技术的规模化发展，含杂质超临界CO2输送管道内腐蚀问题已成为制约其应用的瓶颈。超临界CO2输送管道中杂质繁多、相态多变，腐蚀过程非常复杂，导致在认识含杂质超临界CO2管道的腐蚀问题上存在较大的局限性。因此，寻求复杂腐蚀环境下超临界CO2输送管道的腐蚀机理及其腐蚀预测模型非常必要。本课题拟通过模拟超临界CO2输送管道的腐蚀环境，研究复杂相态下气体杂质、含水量和流速对超临界CO2输送管道腐蚀行为的影响规律，获取超临界CO2输送管道腐蚀机制；采用扫描电镜、X射线光电子能谱、X射线衍射和拉曼光谱等先进分析技术，揭示含杂质超临界CO2输送管道腐蚀机理；并在实验的基础上建立含水量、气体杂质和流速共同作用下的超临界CO2输送管道腐蚀预测模型，旨在突出对CCS过程中含杂质超临界CO2输送管道腐蚀演化机制的科学认识，为超临界CO2输送管道的安全输送及CCS技术的应用提供理论依据。

随着碳捕获与封存（CCS）技术的规模化发展，含杂质超临界CO2输送管道内腐蚀问题已成为制约其应用的瓶颈。超临界CO2输送管道中杂质繁多、相态多变，腐蚀过程非常复杂，导致在认识含杂质超临界CO2管道的腐蚀问题上存在较大的局限性。因此，寻求复杂腐蚀环境下超临界CO2输送管道的腐蚀机理及其腐蚀预测模型非常必要。本课题通过模拟超临界CO2输送管道的腐蚀环境，研究了复杂相态下气体杂质、含水量和流速对超临界CO2输送管道腐蚀行为的影响规律，获取了超临界CO2输送管道腐蚀机制；采用扫描电镜、X射线光电子能谱、X射线衍射和拉曼光谱等先进分析技术，揭示了含杂质超临界CO2输送管道腐蚀机理；并在实验的基础上建立了含水量、气体杂质和流速共同作用下的超临界CO2输送管道腐蚀预测模型，旨在突出对CCS过程中含杂质超临界CO2输送管道腐蚀演化机制的科学认识，为超临界CO2输送管道的安全输送及CC S技术的应用提供理论依据。