A single-stage hybrid (dry/wet) dephlegmator for application in air-cooled steam condensers: Performance analysis and implications

•Dry-cooled condensers have limited performance at high ambient temperatures.•A single stage hybrid dephlegmator is proposed to increase condenser performance.•The hybrid ACC is more compact and therefore less capital intensive.•The average annual water consumption in the hybrid ACC is 0.19 kL/MWh.•...

Celý popis

Uloženo v:
Podrobná bibliografie
Vydáno v:Thermal science and engineering progress Ročník 26; s. 101108
Hlavní autoři: du Plessis, Jacques, Owen, Michael
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Ltd 01.12.2021
Témata:
Air cooled condenser
Annual performance
Hybrid cooling
Power Generation
Water consumption
Water consumption
Air cooled condenser
Annual performance
Hybrid cooling
Power Generation
ISSN:2451-9049, 2451-9049
On-line přístup:Získat plný text
Tagy: Přidat tag
Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!
Popis
Shrnutí:•Dry-cooled condensers have limited performance at high ambient temperatures.•A single stage hybrid dephlegmator is proposed to increase condenser performance.•The hybrid ACC is more compact and therefore less capital intensive.•The average annual water consumption in the hybrid ACC is 0.19 kL/MWh.•The hybrid ACC could also mitigate the adverse effects of wind on conventional ACC performance. This paper presents a comparative simulation between a Rankine cycle steam turbine coupled to a hybrid air-cooled condenser (ACC) which incorporated a single-stage hybrid (dry/wet) dephlegmator (HDWD) and a conventional (all-dry) ACC. The comparative simulation consisted of three scenarios: site-specific design conditions, annual modelling (typical meteorological year), and a hypothetical adverse wind condition case. The hybrid ACC that incorporates an HDWD aim to enhance condenser performance during high ambient temperatures or windy periods by operating in deluge mode. This study showcases the operational benefits of the hybrid ACC and answers important questions regarding the technical feasibility of such a system. In the first scenario, the hybrid (deluge mode) and conventional ACC were sized at the 1% design condition for a minimum number of units while maintaining a turbine backpressure of 19942.7 Pa. The hybrid ACC consisted of 4 streets of 6 units, while the conventional ACC consisted of 6 streets of 6 units. At the design conditions, the hybrid ACC’s specific water evaporation was 0.8kL/MWh and the HDWD’s heat transfer rate was approximately 4.7 times greater than a conventional dephlegmator unit. The second scenario demonstrated that the hybrid ACC could operate in dry mode for 75% of the year (Tdb < 29.72 °C) with an annual specific water consumption of 0.19kL/MWh (significantly less than a wet-cooled plant). The third scenario showed that the hybrid ACC could also mitigate the adverse effects of wind on conventional ACC performance.
ISSN:2451-9049
2451-9049
DOI:10.1016/j.tsep.2021.101108