Insight on electrical and thermal powers mix with a Gen2 PWR: Rankine cycle performances under low to high temperature grade cogeneration

H.D. Nguyen, N. Alpy, D. Haubensack and D. Barbier

Energy, 2020, vol. 202, issue C

Abstract: Performances of a Rankine PCS exemplary of the Gen2 PWRs fleet, are mapped under heat cogeneration. In the considered scenarios, steam latent heat is provided in a 146–285 °C range and cogeneration load rates up to 20% of SGs power. THERMOFLEX commercial software and CYCLOP in-house code are applied to balance cycle performances with and without taking into account turbine thermodynamic irreversibilities that arise from part-load operation. Deviations between both approaches highlight that the original cycle designed for a 100% electrical duty, does not deserve to be revised for a low temperature cogeneration application. Instead, growing of part-load irreversibilities indicates optimization possibilities of its design for high temperature grade cogeneration. As such, the most stringent cogeneration case shows a cycle electrical efficiency drop of 2.7 points if one considers a constant cycle bottoming pressure. An exergetic analysis outlines that the turbine governing valve which controls steam admission, plays a key entropic role while degradation of turbine efficiency and impact of SG feed water temperature change, remain low. Shift of turbine expansion lines to lower pressures is the reason for a weakly changed turbine efficiency, by reducing stage losses contribution due to steam moisture content.

Keywords: Energy mix; Cogeneration; PWR; Exergy; Part-load; Turbine (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:202:y:2020:i:c:s0360544220306253

DOI: 10.1016/j.energy.2020.117518

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