Presently there is insufficient knowledge to enable the correct predictions for the depressurisation thermodynamic trajectory of supercritical or dense phase CO2 in the presence of impurities particularly those likely to be present from carbon capture resulting from power generation using fossil fuels. Our preliminary investigations show significant changes in the presence of N2 at concentrations greater than 1 %. This is followed by hydrogen and methane. The study of CO2 pipeline ductile and brittle failures must entail the development and application of appropriate equations of state and the detailed consideration of the interactions between the transported fluid and the materials of containment. Development of a means for accurate thermodynamic depressurisation trajectory and multiphase outflow modelling are necessary to enable adequate determination of the mass, momentum, energy and state of CO2 released as a result of a pipeline failure. Utilising the factors determined in said modelling should enable hazard source term definition sufficiently to select and apply the appropriate transmission (dispersion) models used to estimate distance to a specified level of harm for a receiving target. Establishment of the conditions for, and consequences of, ductile or brittle failure is also necessary to define the physical attributes of a release source and subsequent hazard analysis. Comparison of the factors resulting in CO2 pipeline brittle or ductile failures against established models used for such predictions of other hazardous fluids (particularly natural gas) will enable confidence in the application of available pipeline damage and failure data for the estimation of supercritical or dense phase CO2 pipeline failure probability. Satisfaction of these requirements coupled with appropriate vulnerability criteria should enable adequate and appropriate estimation of the risks associated with CO2 pipelines. Satisfaction of all of the above should enable the development of appropriate standards for relevant matters of material selection and maintenance activities associated with the purification and transportation of supercritical and dense phase CO2.
CO2 pipelines material and safety considerations
2009
7 Seiten, 5 Bilder, 2 Tabellen, 24 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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