Performance evaluation of CO₂ pressurization and storage system combined with S–CO₂ power generation process and absorption refrigeration cycle

The optimization of CO₂ compression process in carbon capture and storage (CCS) can reduce the power consumption and cost of the entire system. A combined CO₂ pressurization and storage system including a S–CO₂ power generation process and an absorption refrigeration cycle (ARC) is put forward. ARC can complement the CO₂ liquefaction and pumping process to decrease the power demanded in CO₂ compression. Besides, S–CO₂ power generation process driven by waste heat can provide additional electricity. The thermodynamic analysis is carried out firstly followed by an exergoeconomic analysis. Then, the influences of major variables on the performance parameters are analyzed. Finally, the proposed system is compared with other three systems. The results indicate that the main exergy destructions occur in the fifth heat exchanger (HE5) and heat. In addition, the absorber (ABS) occupies an important position in the exergoeconomic aspect, which means that an increment of the capital investment cost of which is needed. Moreover, lower conditioning pressure and temperature difference of generator, higher S–CO₂ turbine inlet temperature and suitable S–CO₂ turbine outlet pressure can effectively reduce the compression power and cost. Furthermore, compared with other three typical CCS systems, the proposed system has advantages in both thermodynamic and exergoeconomic aspects.