Source terms calculation and atmospheric dispersion for a dynamic release from a CO₂ pipeline containing methane and water as impurities

Abstract

A method for calculating the source terms including values of leak rate, phase fraction, final velocity, and temperature at the position where the leakage jet has expanded to atmospheric pressure from a CO2 pipeline containing impurities (methane and water) is presented with regard to the time‐dependency of the source terms during the leakage. The thermodynamical properties for the mixture are calculated using the Soave‐Redlich‐Kwong equation of state with modified 1st order Huron‐Vidal mixing rule, which is adjustable in PVTsim. The results for the solubility of water in CO2 have shown that this thermodynamic model provides accurate predictions for the mixture properties. The thermodynamic model has been used along with a robust transient two‐phase flow simulator, OLGA, to simulate the leak from the pipeline. Finally, the predicted time‐dependant source terms (Release Rate, Phase Fraction, Final Velocity, and Temperature in the downstream of the leak) were used as input into the dispersion model (UDM) in form of sequential segments.

Diffusion coefficients of CO2–SO2–water and CO2–N2–water systems and their impact on the CO2 sequestration process: Molecular dynamics and dissolution process simulations

“…Formerly, different aspects of the impure CO 2 sequestration process have been investigated but most of the researchers used an assumption to ignore the effect of impurities on the CO 2 diffusion coefficient. [10][11][12][13][14][15] Diffusion coefficient is an important factor, which plays a role in different phenomena during different time scales of the CO 2 sequestration. During injection phase, it appears in the fluid movement calculations and controls the viscous fingering and consequently the capillary trapping mechanism.…”