Integrated fossil fuel and solar thermal systems for hydrogen production and CO2 mitigation |
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Authors: | Zhaolin Wang Greg F. Naterer |
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Affiliation: | 1. Clean Energy Research Laboratory, University of Ontario Institute of Technology, 2000 Simcoe St N, Oshawa, Ontario L1H 7K4, Canada;2. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John''s, Newfoundland A1B 3X5, Canada |
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Abstract: | In most current fossil-based hydrogen production methods, the thermal energy required by the endothermic processes of hydrogen production cycles is supplied by the combustion of a portion of the same fossil fuel feedstock. This increases the fossil fuel consumption and greenhouse gas emissions. This paper analyzes the thermodynamics of several typical fossil fuel-based hydrogen production methods such as steam methane reforming, coal gasification, methane dissociation, and off-gas reforming, to quantify the potential savings of fossil fuels and CO2 emissions associated with the thermal energy requirement. Then matching the heat quality and quantity by solar thermal energy for different processes is examined. It is concluded that steam generation and superheating by solar energy for the supply of gaseous reactants to the hydrogen production cycles is particularly attractive due to the engineering maturity and simplicity. It is also concluded that steam-methane reforming may have fewer engineering challenges because of its single-phase reaction, if the endothermic reaction enthalpy of syngas production step (CO and H2) of coal gasification and steam methane reforming is provided by solar thermal energy. Various solar thermal energy based reactors are discussed for different types of production cycles as well. |
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Keywords: | Hydrogen production Solar energy Fossil fuels CO2 reduction |
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