Decompression characteristics of CO2 pipelines following rupture

作者：Teng, Lin; Li, Yuxing^*; Zhao, Qing; Wang, Wuchang; Hu, Qihui; Ye, Xiao; Zhang, Datong

来源：Journal of Natural Gas Science and Engineering, 2016, 36: 213-223.

DOI：10.1016/j.jngse.2016.10.026

• CCS
• CO2 pipeline
• Decompression characteristics
• Mathematical model
• Elastic coefficient

A rapid transient flow will occur when a CO2 pipeline is ruptured or punctured. The pressure and temperature in pipeline can drop rapidly, which might increase the risk of ductile fracture propagation. To understand the decompression characteristics of CO2 pipelines, the middle-scale release experiments in different phase states (supercritical, liquid, pure gaseous and gaseous CO2 containing impurity) were carried out and a simplified transient flow model coupled with the equation of decompression wave speed was developed. To simplify the calculation of decompression wave speed, the elastic coefficient K was first addressed for characterizing the decompression wave speed of CO2 in different phase states and the empirical correlations of the elastic coefficient in different phase states and their scope of application were recommended. The results presented that the predictions for supercritical and gaseous CO2 leakage were in better agreement with the experimental data than that for liquid CO2 leakage, which indicated that the characteristics of supercritical CO2 was similar to gaseous CO2 in decompression process.

• 出版日期2016-11
• 单位中国石油大学（华东）