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Exergy analysis and optimization of a hydrogen production process by a solar-liquefied natural gas hybrid driven transcritical CO2 power cycle
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Sun, Zhixin, Wang, Jiangfeng, Dai, Yiping and Wang, Jihong (2012) Exergy analysis and optimization of a hydrogen production process by a solar-liquefied natural gas hybrid driven transcritical CO2 power cycle. International Journal of Hydrogen Energy, Volume 37 (Number 24). pp. 18731-18739. doi:10.1016/j.ijhydene.2012.08.028 ISSN 0360-3199.
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Official URL: http://dx.doi.org/10.1016/j.ijhydene.2012.08.028
Abstract
A solar transcritical CO2 power cycle for hydrogen production is studied in this paper. Liquefied Natural Gas (LNG) is utilized to condense the CO2. An exergy analysis of the whole process is performed to evaluate the effects of the key parameters, including the boiler inlet temperature, the turbine inlet temperature, the turbine inlet pressure and the condensation temperature, on the system power outputs and to guide the exergy efficiency improvement. In addition, parameter optimization is conducted via Particle Swarm Optimization to maximize the exergy efficiency of hydrogen production. The exergy analysis indicates that both the solar and LNG equally provide exergy to the CO2 power system. The largest amount of exergy losses occurs in the solar collector and the condenser due to the great temperature differences during the heat transfer process. The exergy loss in condenser could be greatly reduced by increasing the LNG temperature at the inlet of the condenser. There exists an optimum turbine inlet pressure for achieving the maximum exergy efficiency. With the optimized turbine inlet pressure and other parameters, the system is able to provide 11.52 kW of cold exergy and 2.1 L/s of hydrogen. And the exergy efficiency of hydrogen production could reach 12.38%.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
| Journal or Publication Title: | International Journal of Hydrogen Energy | ||||
| Publisher: | Elsevier BV | ||||
| ISSN: | 0360-3199 | ||||
| Official Date: | December 2012 | ||||
| Dates: |
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| Volume: | Volume 37 | ||||
| Number: | Number 24 | ||||
| Page Range: | pp. 18731-18739 | ||||
| DOI: | 10.1016/j.ijhydene.2012.08.028 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | National Key Technology Research and Development Program, National High Technology Research and Development Program of China , University of Warwick Strategic Awards | ||||
| Grant number: | 2011BAA05B03 (National Key Technology Research and Development Program); SS2012AA053002 (National High Technology Research and Development Program of China) | ||||
| Title of Event: | 2011 International Workshop on Molten Carbonates & Related Topics |
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