Transport of CO2: Presentation of New Thermophysical Property Measurements and Phase Diagrams

Abstract

International audienceCO 2 transportation is an integral part of the CCS chain. After capture, CO 2 needs to be transported to locations whereby it is stored or alternatively used in various processes. CO 2 can be transported via ship or pipeline. In both cases, the required compression pressure can be 100–300 bar, depending on the distance and intended disposal or use of CO 2. The CO 2 rich stream can contain a lot of impurities which can modify the phase diagram and change the thermophysical properties of the stream in comparison with the ones of pure CO 2. Indeed, along with carbon dioxide, a great number of compounds such as water, O 2 , N 2 , Ar, SOx, NOx, H2 and CO can be present at different levels of concentration. During transportation by pipeline, if the pipe suffers a major fracture due to an accidental release or a failure, CO 2 can rapidly expand and cool: vapour cloud followed by solid formation of CO 2 may appear. The impurities could change the characteristics of the leak and change the conditions and compositions of CO 2 clouds and solid. The presence of water can also be a source of gas hydrate formation, ice or corrosion. In this communication we will present new experimental data and their modelling concerning the phase diagrams of systems rich in CO 2 and their thermophysical properties. Comparisons of the results obtained using different equations of state are also reported

Vapour-liquid equilibrium data for the carbon dioxide (CO2) + carbon monoxide (CO) system

“…In spite of numerous investigations over the past few years in this direction, considerable research work still needs to be performed because of the variety of components and the large domain of pressure, temperature and composition to be covered.. Previously, we performed various experimental and modelling investigations, to obtain thermophysical properties of binary and multicomponent natural gas mixtures with wide ranges of CO2 content [15][16][17][18]. The binary CO + CO2 system was another CCUS fluid with a limited number of experimental data available in the open literature when these new data were measured in 2011.…”

Real Fluid Modeling and Simulation of the Structures and Dynamics of Condensation in CO2 Flows Shocked Inside a de Laval Nozzle, Considering the Effects of Impurities

“…This means that the amount of impurities plays a dominant role in shifting thermodynamic properties on both sides of the phase envelope, but more so on the evaporation side than on the condensation side. Further discussion on the effects of impurities on the (CO 2 -impurities) phase envelope can be found in references [7,17]. The numerical schemes for simulating two-phase flows, such as the Volume of Fluid method (VOF) [18], Level Set method (LS) [19] and Diffuse Interface method (DIM) [20][21][22], are largely dependent on interface computation.…”

Formation of amorphous and quasi-two-dimensional microcrystalline structures of CO2 in activated carbon pores at low temperatures

“…This molecule can be removed from the atmosphere by a technology known as carbon capture and storage (CCS), which consists of adsorption processes using absorbents as zeolites, nanocarbons, MOFs, among others [7,46,47]. This process is considered one of the most promising solutions for reducing the concentration of CO2 in the atmosphere [46,48]. Although many studies are focusing on CO2 at the emission source, a place which has a high concentration of this gas, like factories [48], some other studies also indicate that the capture of CO2 at low relative pressure is also important [43] which could lead to the removal of this greenhouse gas more effectively from many parts of the atmosphere [43].…”