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Keywords
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exergy analysis, hydrogen production, organic Rankine cycle, sulfur-iodine, thermochemical reaction
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Abstract
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In this study, a novel integrated structure for generation of the oxygen, hydrogen,
power, and hot water by employing thermochemical reactors and solar dish col-
lectors is proposed. The presented process including solar dish collectors, sulfur-
iodine thermochemical cycle, and Organic Rankine Cycle. In this configuration,
for 5854 kmol/h of inlet water, 2236 kmol/h of oxygen, and 4432 kmol/h of
hydrogen are produced. This system can provide 22 666 kW of power that
22 026 kW is utilized in the sulfur-iodine reaction. So, the net electrical power is
found to be 640 kW. A general exergy analysis is carried out on the whole struc-
ture and equipment to find its exergy losses and improvement potential to
enhance the exergy efficiency of the system. The total exergy efficiency of the pro-
cess is calculated 56.33% and its exergy destruction is obtained 382 301.31 kW.
Heat exchangers and solar collectors have the highest values of destructed exergy,
which about 69% of destructed exergy is related to them. These devices have a
strong potential for enhancement. The results showed that component P1 (pump)
has the lowest exergy efficiency that is 15.58%, while its exergy destruction is not
the greatest. Therefore, for having a better examination of this structure, both
exergy efficiency and exergy destruction parameters should be evaluated simulta-
neously. Moreover, a sensitivity analysis is applied to survey the performance of
some performance indicators vs different design parameters. It is concluded that
by an increase in generated heat by solar collectors, exergy efficiency, energy effi-
ciency, oxygen, and hydrogen production faces increment.
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