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4E Study and Best Performance Analysis of a Hydrogen Multi-Generation Layout by Waste Energy Recovery of Combined SOFC-GT-ORC

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posted on 2024-07-05, 06:04 authored by M Zoghi, N Hosseinzadeh, Saleh GharaieSaleh Gharaie, Ali ZareAli Zare
Different approaches have been suggested for the waste heat recovery of high-temperature exhausted gas of a solid oxide fuel cell (SOFC). In such systems, mostly gas turbine (GT) and organic Rankine cycle (ORC) are added as bottoming systems to the SOFC (Configuration 1). However, the SOFC-GT-ORC has a considerable amount of waste energy which can be recovered. In the present research, the waste energy of ORC in the heat rejection stage and the residual exhausted gas of the system were recovered by a thermoelectric generator (TEG) and a hot water unit, respectively. Then, the extra produced power in the TEG was directed to a proton exchange membrane electrolyzer and a reverse osmosis desalination unit (RODU) for hydrogen and potable water outputs. The performance of SOFC-GT, Configuration 1, and Configuration 2 was compared through a 4E (energy, exergy, exergy-economic, and environmental) analysis. In the best performance point, the exergy efficiency and unit cost of product (UCOP) of SOFC-GT were obtained as 69.41% and USD 26.53/GJ. The exergy efficiency increased by 2.56% and 2.86%, and the UCOP rose by 0.45% and 12.25% in Configurations 1 and 2. So, the overall performance of Configuration 1 was acceptable and Configuration 2 led to the highest exergy efficiency, while its economic performance was not competitive because of the high investment cost of RODU.

History

Journal

Energies

Volume

17

Article number

ARTN 2791

Pagination

2791-2791

Location

Basel, Switzerland

Open access

  • Yes

ISSN

1996-1073

eISSN

1996-1073

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Issue

11

Publisher

MDPI

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