The upper limit of moisture content for supercritical CO₂ pipeline transport

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• 作者：Yong Xiang ; Zhe Wang ; ^{zhewang@tsinghua.edu.cn} ; Xiaoxian Yang ; Zheng Li ; Weidou Ni
• 关键词：CO2 pipeline ; Critical relative humidity ; SO2 corrosion ; Pipeline thermodynamic model ; Thermal insulation ; Moisture content
• 刊名：The Journal of Supercritical Fluids
• 出版年：2012
• 期刊代码：60_08968446
• 类别：ce
• 出版时间：July, 2012
• 卷：67
• 期：Complete
• 页码：14-21
• 文件大小：1188 K

摘要

A systematic method was established to determine the upper limit of moisture content for supercritical CO₂ pipeline transport. In the corrosion experiments, the weight-loss method was applied to measure the corrosion rate of X70 steel exposed to a supercritical CO₂/SO₂/O₂/H₂O mixtures for different relative humidity, aiming to explore the critical relative humidity point for X70 steel corrosion under such conditions, which is a crucial point for setting the upper limit of moisture content. The critical relative humidity was estimated to be between 50%and 60%on the basis of the experiment results. The microstructure and chemical composition of the corrosion products were examined employing SEM and XRD. Based on the estimated critical relative humidity combining with the solubility consideration of H₂O in CO₂ at various temperatures and pressures, the pipeline thermodynamic model was used to determine the upper limit of moisture content for supercritical CO₂ pipeline transport.