Analysis of Compression Strategies and Transport of Ethane in Gas and Dense Phase through Pipeline

Abstract

Transporting ethane efficiently and economically is critical due to its significance as the second major component of natural gas. Various models traditionally used for natural gas pipeline transport can be adapted for analyzing ethane transport under different conditions. This study compares ethane transportation in dense and gas phases, assessing their respective energy and cost efficiencies, while also exploring optimal compression strategies. Using FORTRAN software, simulations were performed under constant parameters, including a pipeline length of 38 km, a flow rate of 7 kg/s, and a fixed delivery pressure. Key variables analyzed were the inlet pressure and pipeline diameter, while their impact on operational performance and cost efficiency was systematically evaluated. The results indicate that dense-phase transport is more energy-efficient and cost-effective compared to gas-phase transport. Specifically, using pipelines with a 0.1 m diameter, an inlet (discharge) pressure of 90 bar, and a suction pressure of 50 bar emerged as the optimal configuration for transporting ethane over a 38 km pipeline at 7 kg/s. This setup minimizes the number of pipelines segments, reduces power consumption, and ensures operational safety within prescribed limits. A cost analysis further reinforced that while smaller pipeline diameters incur lower capital costs, their increased operational demands make them less economical in the long term. Conversely, larger diameters significantly reduce operational power requirements despite higher initial investment. This study provides insights into the critical design and operational parameters for ethane pipeline transport, emphasizing dense-phase operation as the preferred choice. Future investigations could explore advanced materials and alternative energy sources to further optimize transportation systems for ethane and similar hydrocarbons.