Volume 34: CCUS Technologies for the Carbon Neutrality: Part II

Establishment of computational model for CO2 experimental pipeline charging process based on equal-density principle Shuai Yu, Xingqing Yan, Yifan He, Jianliang Yu

Abstract

The sustainable deterioration of the climate caused by continuous global warming poses a serious threat to human survival. Carbon Capture Utilization and Storage (CCUS) is a potential and effective technology to alleviate global warming. CO2 pipeline transportation is an economical and safety way to connect other parts in the CCUS system. It is essential to understand the characteristics of CO2 release and hazards and these are essential to the design and arrangement of pipeline. Existent CO2 pipeline release experimental studies lack of repeatable verification tests, especially those seriously affected by the environment, CO2 far-field diffusion research, for example. It is necessary to guarantee the same initial conditions between different repetitive tests. In this paper, the equal density principle for CO2 pipeline release tests was summed up based on thermal process before release operation. A computational model to calculate the charging mass and phase state of CO2 to achieve a specific initial pressure and temperature inside pipeline for release test was established, using MTLAB software. The Span-Wagner (SW) equation of state was applied to calculate the thermodynamic properties of CO2. The initial pressure, initial temperature, and inventory in authors’ previous studies are presented. By comparing the experimental data and the calculated results, the model has good predictive ability. Larger CO2 mass for the injection operation is the result of lower initial temperature or greater initial pressure. The numerical model provides convenience to improve accuracy for CO2 release tests.

Keywords CCUS, Pipeline transportation, CO2 release, Numerical model, Thermodynamics