Development of CO2 liquefaction cycles for CO2 sequestration

Abstract CO 2 pressurization is a necessary component in any CO 2 capture and sequestration (CCS) where enhanced oil recovery (EOR) is to be applied. The power demand for the CO 2 pressurization process consumes about 4% from the power plant net power. In this paper, several CO 2 pressurization methods, such as compression or liquefaction and pumping using an open cycle or closed cycles, were explored and evaluated. New CO 2 liquefaction cycles based on single refrigerant and cascade refrigerants were developed and modeled using HYSYS software. The models were validated against experimental data and/or verified against other simulation software. The liquefaction parameters were optimized for minimum overall power consumption. The considered refrigerants for CO 2 liquefaction are NH 3 , CO 2 , C 3 H 8 and R134a. One of the developed liquefaction cycles that liquefies the CO 2 at 50 bar using NH 3 refrigerant resulted in 5.1% less power consumption than the conventional multi-stage compression cycle as well as 27.7% less power consumption than the open CO 2 liquefaction cycle.

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