Flexibility assessment of a modified double-reheat Rankine cycle integrating a regenerative turbine during recuperative heater shutdown processes

Shunqi Zhang, Ming Liu, Yuegeng Ma, Jiping Liu and Junjie Yan

Energy, 2021, vol. 233, issue C

Abstract: Integrating a regenerative turbine (RT) is a significant modification to improve the Rankine cycle efficiency by reducing the superheat degree of extraction steam. This work evaluates the short-term operational flexibility of the modified cycle, emphasizing the evaluation of recuperative heater shutdown as a method to rapidly increase the power generation. A number of scenarios were modeled that included a shutdown of recuperative heaters, and the power change was observed. Results indicate that the utilization of an RT decreases the operational flexibility of the power plant with the high-pressure recuperative heater (HPH) shutdown. It shows that the adjusting time of total power generation increases by 492.9–550.6 s and the maximal output power increment reduces by 6.0–28.1 MW compared to that of the conventional Rankine cycle (CRC). Control strategies are proposed and evaluated to improve response performance and limit the deaerator (DTR) pressure. The results reveal that the adjusting time of the total power and maximum negative overshoot value could be reduced by 342.8 s and 7.79 MW, respectively, with a normal DTR pressure under the condition of No.3 and No.4 HPH shutdowns.

Keywords: Regenerative turbine; Dynamic simulation; Operational flexibility; Modified Rankine cycle; Control strategy development (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:233:y:2021:i:c:s0360544221013165

DOI: 10.1016/j.energy.2021.121068

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