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An innovative approach to recovery of fluctuating industrial exhaust heat sources using cascade Rankine cycle and two-stage accumulators

Li, Pengcheng; Cao, Qing; Li, Jing; Lin, Haiwei; Wang, Yandong; Gao, Guangtao; Pei, Gang; Jie, Desuan; Liu, Xunfen

Authors

Pengcheng Li

Qing Cao

Haiwei Lin

Yandong Wang

Guangtao Gao

Gang Pei

Desuan Jie

Xunfen Liu



Abstract

The fluctuating property of the heat source is a technical obstacle of waste heat recovery, which leads to part-load operation and reduced economics. This work presents a novel system to mitigate the fluctuations by using steam-organic Rankine cycles (RC-ORC) and two-stage steam accumulators. The system can switch between isothermal heat storage and discharge simply by the regulation of water mass flow (m ) from the low-temperature accumulator (LTA) to the high-temperature accumulator (HTA). In the heat charge mode, m rises when the inlet temperature or mass flow of the heat source increases. The water level of the HTA elevates. Analogously, in the heat discharge mode, m decreases and more water accumulates in the LTA. The RC-ORC operates under the rated condition consistently through the unique structural design. The fundamentals and features of the system are illustrated. Given two typical heat source conditions, the fluctuations in thermal efficiencies are minor (15.63–15.84% and 19.57–19.70%). Thermo-economic estimation of the tanks indicates that the steel cost is roughly 1306 $ and 432 $, respectively. Compared with the single-stage ORC using stream control, the normalized investment cost (NIC) is reduced by 888–925 $/kW. 2 2 2

Citation

Li, P., Cao, Q., Li, J., Lin, H., Wang, Y., Gao, G., …Liu, X. (2021). An innovative approach to recovery of fluctuating industrial exhaust heat sources using cascade Rankine cycle and two-stage accumulators. Energy, 228, Article 120587. https://doi.org/10.1016/j.energy.2021.120587

Journal Article Type Article
Acceptance Date Apr 4, 2021
Online Publication Date Apr 9, 2021
Publication Date Aug 1, 2021
Deposit Date Mar 24, 2022
Publicly Available Date Mar 28, 2024
Journal Energy
Print ISSN 0360-5442
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 228
Article Number 120587
DOI https://doi.org/10.1016/j.energy.2021.120587
Keywords Steam-organic Rankine cycles; Fluctuating waste heat; Two-stage steam accumulators; Heat storage; Heat discharge
Public URL https://hull-repository.worktribe.com/output/3759076

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