Evaluation of CO₂ Transport Design via Pipeline in the CCS Systems with Various Distance Combinations

Carbon dioxide transportation plays an important role in the CCS system. The pipeline is the most economically viable for CO₂ transport medium. In this paper, the design of the CO₂ pipeline is systematically evaluated from a technical and economic aspect. Four transport process conditions including CO2 transport in the gaseous phase, liquid phase, dense phase, and supercritical phase will be assessed to obtain the most feasible transport design. A supercritical phase has an advantage when to be applied for long-distance and large-scale CO₂ transportation. In the CCS network, the distance between source and sink points may vary. The variation in the distance and transport capacity make a supercritical phase not an effective pipeline transport condition. The proposed methods to determine the optimum design of onshore pipelines with a projected CO₂ flow rate are presented in this paper. The methods are based on the simple correlations developed from a wide range of generic cases of CO₂ transport. The optimum design is identified from the minimum total annual cost. The result shows that the pipeline design in the CCS network can be performed in the liquid phase when the distance is lower than 100 km.