Perpustakaan Digital ITB

The transportation of CO? through pipelines plays a critical role in Carbon Capture and Storage (CCS) systems, particularly in ensuring phase stability and minimizing pressure losses during long-distance transmission. This study presents an open-source based numerical approach for predicting pressure drop and phase behavior in CO? pipelines. The pipeline systems analyzed include ZN-1 (53 km) and ZN-2 (170 km), transporting a CO?-rich mixture with hydrocarbons and water. Fluid properties were calculated using the Peng–Robinson Equation of State with Kay’s Rule applied to estimate pseudo-critical points. Numerical simulations yielded excellent agreement with commercial software results, with average relative errors of 0.32% for ZN-1 and 0.51% for ZN-2—well within the acceptable threshold of ±5%. A phase transition from supercritical to liquid was predicted at segment 787 in ZN-2 due to temperature dropping below the critical point, although commercial simulation indicated the transition at segment 545. The model also evaluated diameter sensitivity using a grid search algorithm. For ZN-1 under reduced inlet conditions (1260 psia, 110 °F), a minimum diameter of 6.4239 inches was found necessary to maintain supercritical conditions. However, for ZN-2, no diameter within the tested range (3.937 – 78.74 inch) could prevent phase transition, indicating that topography and heat loss dominate phase behavior. This study affirms the viability of the open-source based numerical model as a reliable tool for early-stage engineering design and verification, especially in resource-constrained environments where access to commercial simulation tools is limited.