含杂质超临界CO2输送管线流体相行为及腐蚀机理

项目名称： 含杂质超临界CO2输送管线流体相行为及腐蚀机理

项目编号： No.51471188

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 孙建波

作者单位： 中国石油大学（华东）

项目金额： 85万元

中文摘要： 碳捕集与封存（CCS）作为全球CO2减排的关键技术之一，其规模化和商业化应用需要大规模地建设超临界CO2输送管线，在超临界CO2流体中杂质组分的相互作用决定了其腐蚀机理的复杂性，该类管线的内腐蚀既是工程领域管道完整性管理面临的难题，又是腐蚀研究领域亟待解决科学问题。本项目以CCS过程中含杂质的超临界CO2输送管线为研究对象，通过相行为和水化学特性分析，建立超临界CO2-H2O-杂质体系流体热力学模型，阐述杂质与水相析出及水化学特性的关系。通过腐蚀模拟实验、高压原位电化学测试和腐蚀膜的微观表征，揭示超临界CO2输送管线钢腐蚀膜生长演化机制及腐蚀电化学机理，同时澄清杂质组分之间对管线钢腐蚀的协同作用机理，从本质上阐明含杂质超临界CO2输送管线的腐蚀机制。在此基础上，建立含杂质超临界CO2输送管线的腐蚀模型，从而为CCS中含杂质超临界CO2输送管线的腐蚀预测和完整性管理提供科学依据和技术支撑。

中文关键词： 碳捕集与封存；超临界CO2；腐蚀机理；杂质；电化学行为

英文摘要： As one of the key technologies for reducing CO2 emissions worldwide, there is an urgent need to accelerate the commercial deployment of carbon capture and storage (CCS).Accordingly, the transmission of supercritical CO2 by pipelines will be necessary if large volumes of captured CO2 are to be stored in geological formations. For the supercritical CO2 fluid, the interaction between various kinds of impurity components complicates the corrosion mechanism of the pipelines. The internal corrosion of pipelines containing impurities will be a challenge of pipeline integrity management and an urgent scientific problem to be solved in the field of corrosion research. In this project, based on the analysis of phase behavior and water chemistry characteristics, the thermodynamic model is established to expound the relationship between impurities and precipitated water phase as well as water chemistry characteristics. In order to clarify the corrosion synergistic effect mechanism among the impurity components on the corrosion of pipeline steels, corrosion simulation tests, in-situ electrochemical tests under high pressure and microstructure characterization of corrosion scales are employed to reveal the growth mechanism of corrosion scale and electrochemical corrosion mechanism. It is expected to illustrate the essential corrosion mechanism of supercritical CO2 transmission pipeline containing impurities. On this basis, the corrosion model of supercritical CO2 pipeline containing impurities is established eventually. This research will provide the experimental and theoretical basis for the establishment of quality specifications of supercritical CO2 fluid, and provide the scientific basis and technical support for corrosion prediction and integrity management of supercritical CO2 transmission pipeline in CCS.

英文关键词： carbon capture and storage;supercritical CO2;corrosion mechanism;impurities;electrochemical behavior