| 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],53(24):19-30 |
| Research Progress on Corrosion Behavior and Mechanism of Supercritical CO2 Transport Pipeline |
| Received:March 17, 2024 Revised:June 12, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.24.002 |
| KeyWord:supercritical CO2 pipeline corrosion impurity gas transport technology |
| Author | Institution |
| LI Zhenbo |
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
| HAN Zhongzhi |
CNPC Engineering Technology Research Co., Ltd, Tianjin , China |
| LIN Bing |
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
| XIAO Yinng |
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China;Shenzhen Gas Group Co., LTD, Guangdong Shenzhen , China |
| WANG Yingying |
Key Laboratory of Optoelectronic Chemical-Materials and Devices,.Ministry of Education, Jianghan University, Wuhan , China |
| NIE Zhen |
PetroChina Research Institute of Petroleum Exploration & Development, Beijing , China |
| TANG Junlei |
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China;PetroChina Shenzhen.New Energy Research Institute, Guangdong Shenzhen , China |
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| Abstract: |
| 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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