Analysis of the performance enhancement of dual-pressure organic flash cycle using a split-flow evaporator and an ejector driven by low-grade energy

Mingtao Wang, Pengji Chen and Huanwei Liu

Energy, 2024, vol. 312, issue C

Abstract: To reduce the irreversibility of the throttling in a dual-pressure organic flash cycle (DOFC), this study presents a modified DOFC integrating a split-flow evaporator and an ejector (EE-DOFC). In the EE-DOFC, the flow from the preheater flows into the split-flow tank (ST) and then is split into two parts. One part enters the split-flow evaporator. The other part enters the ejector and entrains the high-pressure (HP) turbine exhaust vapor. The effects of the evaporation pressure, ejector entrainment ratio, and HP turbine outlet pressure on the EE-DOFC performance are studied. The performances of the DOFC, and EE-DOFC are compared under the maximum net power output conditions. The results reveal that after the split-flow evaporator and ejector are integrated, the irreversibility of the pump and mixer decreases and the exergy losses of the ejector and heat exchanger of the EE-DOFC become lower than those of the throttling valves and heat exchanger of the DOFC. The exergy loss of the discharged water is lower in the EE-DOFC than in the DOFC. The net power output and the corresponding levelized cost of electricity (LCOE) of the EE-DOFC are higher by 10.72 % and lower by 10.92 %, respectively, compared with those of the DOFC.

Keywords: Ejector; Split-flow evaporator; Dual-pressure organic flash cycle; Exergy analysis (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:312:y:2024:i:c:s0360544224034431

DOI: 10.1016/j.energy.2024.133665

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