Integrated CO₂ pipeline throttling analysis framework based on coupled phase characteristic prediction

Carbon Capture, Utilization, and Storage (CCUS) has become a strategically important technology for effectively controlling greenhouse gas emissions such as carbon dioxide today. The carbon dioxide transportation system, as an intermediate link in the CCUS system, is an important link between carbon emission sources and storage sites. It is crucial to understand the flow characteristics of carbon dioxide during pipeline transportation. At the same time, there is a throttling effect caused by local resistance components in the pipeline transportation system, and a carbon dioxide system throttling analysis method needs to be constructed to describe the throttling process and its preceding and succeeding states. Due to the phase transition of impurity containing carbon dioxide during pipeline transportation due to operating conditions, the possibility of two-phase flow and the influence of impurities on the phase characteristics of carbon dioxide are considered. To ensure the applicability of the throttling simulation method for pipeline transportation systems, it is necessary to couple the prediction of impurity containing carbon dioxide phase characteristics to form a throttling simulation method for coupling phase characteristic prediction. This is of great significance for the analysis of water and thermal conditions in the CCUS technology transportation process.