李振博,韩忠智,林冰,肖莹,王莹莹,聂臻,唐鋆磊.超临界CO2输送管道腐蚀行为和机理的研究进展[J].表面技术,2024,53(24):19-30.
LI Zhenbo,HAN Zhongzhi,LIN Bing,XIAO Yinng,WANG Yingying,NIE Zhen,TANG Junlei.Research Progress on Corrosion Behavior and Mechanism of Supercritical CO2 Transport Pipeline[J].Surface Technology,2024,53(24):19-30 |
| 超临界CO2输送管道腐蚀行为和机理的研究进展 |
| Research Progress on Corrosion Behavior and Mechanism of Supercritical CO2 Transport Pipeline |
| 投稿时间：2024-03-17 修订日期：2024-06-12 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.24.002 |
| 中文关键词: 超临界CO2 管道 腐蚀 杂质气体 输送工艺 |
| 英文关键词:supercritical CO2 pipeline corrosion impurity gas transport technology |
| 基金项目:中国石油天然气集团公司重大科技专项(2022DJ3211) |
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| Author | Institution |
| LI Zhenbo | College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China |
| HAN Zhongzhi | CNPC Engineering Technology Research Co., Ltd, Tianjin 300451, China |
| LIN Bing | College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China |
| XIAO Yinng | College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China;Shenzhen Gas Group Co., LTD, Guangdong Shenzhen 518040, China |
| WANG Yingying | Key Laboratory of Optoelectronic Chemical-Materials and Devices,.Ministry of Education, Jianghan University, Wuhan 430056, China |
| NIE Zhen | PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China |
| TANG Junlei | College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China;PetroChina Shenzhen.New Energy Research Institute, Guangdong Shenzhen 518000, China |
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| 中文摘要: |
| 碳捕获利用与封存(CCUS)是用于减少二氧化碳排放的有效方法之一。在CCUS技术中，二氧化碳运输起着关键作用。超临界CO2输送以其实用性、高效性和经济性而得到快速发展，成为CCUS技术长期发展的必然选择。超临界CO2管输环境是含有多种气态杂质的高压二氧化碳腐蚀环境，对输送管道腐蚀安全构成严重威胁。综述了超临界CO2输送管道的腐蚀现状和腐蚀机理，重点探讨了杂质气体O2、SO2、H2S和NO2对超临界CO2输送管道腐蚀的影响，各杂质气体相互作用的腐蚀机理还需要进一步研究。此外，还探讨了超临界CO2输送工艺参数，包括流速、含水量、温度和压力对管道腐蚀行为的影响以及其腐蚀机理。目前，超临界CO2管输的临界含水量没有达成一致的认识，实际工况下的临界含水量需要结合温度和压力进行分析。 |
| 英文摘要: |
| Carbon capture, utilization and storage (CCUS) is an important process for reducing carbon dioxide emissions. It has three main stages:capturing carbon dioxide from anthropogenic sources, transporting the carbon dioxide, and ultimately storing it at a geological site. CO2 transport is therefore an important part of the CCUS process, ensuring that the collected CO2 is transported safely, reliably and economically. However, the corrosion behavior of steel pipelines in the presence of typical CO2 flows used in CCUS is unknown. In fact, the operating conditions and energy mix of CCUS pipelines are different from those of CO2 transport in the oil and gas industry. First, CCUS pipelines typically operate at higher pressures, using supercritical fluids to compress carbon dioxide gas (>7.38 MPa or ~70 bar, ~31.1 degrees), so as to prevent complex two-phase flow systems (gas + liquid) and pressure losses. Carbon dioxide transport plays an important role in the CCUS technology. Supercritical carbon dioxide transport is rapidly adopted due to its practicality, efficiency and economic feasibility. Supercritical CO2 transport has become a necessary choice for the long-term development of carbon storage technology. Supercritical CO2 is corrosive. The high-pressure CO2 environment contains various gaseous impurities, which poses a significant risk to the corrosion protection of transport pipelines. The corrosion phenomenon that occurs when metal materials are exposed to the supercritical CO2 environment is called supercritical CO2 corrosion. Supercritical CO2 corrosion of steel has the same characteristics as atmospheric CO2 corrosion (such as the same electrochemical corrosion reaction). Of course, it also has unique corrosion properties, such as high corrosion resistance, and it is easier to form a protective film against corrosion. Regarding the supercritical corrosion of steel by CO2, it is generally believed that dry CO2 will not corrode steel, and corrosion only occurs in water. In this paper, the corrosion state and corrosion mechanism of supercritical carbon dioxide transport pipes are studied. The main types of corrosion that occur in supercritical CO2 pipelines are corrosion and sludge corrosion. The influence of contaminating gases O2, SO2, H2S and NO2 on the corrosion behavior and mechanism of steel in a supercritical CO2 environment is discussed. As the O2 and H2S content increases, the corrosion rate of the pipeline increases and then decreases. In an O2-containing environment, the inner layer of surface corrosion products FeCO3 is dense, and the outer oxide is iron, forming a layer of hydrogen sulfide as a product of corrosion. If the pipeline contains SO2 or NO2, it is necessary to strictly control the content of gas, because the presence of SO2 or NO2 will greatly increase the degree of corrosion of the pipeline. Furthermore, the effects of flow rate, moisture content, temperature and pressure on steel corrosion in a supercritical CO2 environment are discussed. The increase of flow rate and moisture content will increase the corrosion degree of the pipeline, and the corrosion rate of the pipeline will increase first and then decrease with the increase of temperature. When the critical pressure of carbon dioxide is reached, the corrosion of the pipelines becomes very serious. |
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