Development and test of a solar reactor for decomposition of sulphuric acid in thermochemical hydrogen production

“…The energy balance of the reactor is: (5) where is the reactor heat input, and are the heat absorbed/released by the reactions on the reduction/oxidation zones, and are the heat required to rise the temperatures of reactants up to the corresponding reactor zone temperature (T red and T ox respectively), is a further heat rejection needed if the heat released in the oxidation zone is larger than , takes into account the heat required to heat up cerium oxide from oxidation to reduction temperature ( for an isothermal reactor) and finally and take into account radiation and convection losses respectively. The heat released by radiation is proportional to the reactor aperture area and thus is related to the concentration ratio of the optical system.…”

Section: Thermochemical Reactormentioning

confidence: 99%

“…Among the numerous analyzed cycles [3,4], the most investigated ones, both from an experimental and from the reactor design point of view, are based on sulfur [3,5,6], iron [7][8][9], zinc [8,10,11] and cerium [10,12,13]. Typically, thermochemical cycles require high operating temperature making point focus systems (solar tower and solar dish) as the most suitable solution because of the high concentration ratios.…”

Section: Introductionmentioning

confidence: 99%

Solar hydrogen production with cerium oxides thermochemical cycle

Binotti

Marcoberardino

Biassoni

et al. 2017

AIP Conference Proceedings

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Development and experimental study for hydrogen production from the thermochemical two-step water splitting cycles with a CeO 2 coated new foam device design using solar furnace system AIP Conference Proceedings 1850, 100003 (2017) Corresponding author: marco.binotti@polimi.itAbstract. This paper discusses the hydrogen production using a solar driven thermochemical cycle. The thermochemical cycle is based on nonstoichiometric cerium oxides redox and the solar concentration system is a solar dish. Detailed optical and redox models were developed to optimize the hydrogen production performance as function of several design parameters (i.e. concentration ratio, reactor pressures and temperatures) The efficiency of the considered technology is compared against two commercially available technologies namely PV + electrolyzer and Dish Stirling + electrolyzer.Results show that solar-to-fuel efficiency of 21.2% can be achieved at design condition assuming a concentration ratio around 5000, reduction and oxidation temperatures of 1500°C and 1275 °C. When moving to annual performance, the annual yield of the considered approach can be as high as 16.7% which is about 43% higher than the best competitive technology. The higher performance implies that higher installation costs around 40% can be accepted for the innovative concept to achieve the same cost of hydrogen.

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“…High temperature solar or nuclear heat is used to drive these thermochemical cycles. Successful short term on sun demonstration using process prototpyes have been carried out at 1-5 kW scale (Roeb and et al, 2011;Thomey et al, 2012;GA Atomics Staff, 1985). A 300 kW demonstration is currently in progress (SOL2HY).…”

Section: Introductionmentioning

confidence: 99%

Sulfur dioxide disproportionation for sulfur based thermochemical energy storage

et al. 2015

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Sulfur dioxide disproportionation is one of three reaction steps that make up the sulfur based thermochemical cycle used for thermal energy storage of concentrated solar power. The characteristics of this reaction were studied using thermodynamic modeling and laboratory measurements. Modeling results showed full disproportionation can only be achieved at pressure. The reaction driving force is enhanced by system pressure but declines with increasing temperature. Appropriate water to sulfur dioxide ratio also drives disproportionation. Batch experiments showed that reaction rate increases with temperature. A catalyst survey identified homogenous iodides as catalysts that can improve the reaction rate by up to twenty times while increasing the apparent extent of disproportionation. The dependence of disproportionation rate on sulfuric acid concentration was established via constant pressure experiments. Means to recover the iodide catalyst from sulfuric acid and molten sulfur for reuse were demonstrated. Modeling and test results were used to establish a design concept for a sulfur dioxide disproportionation reactor system capable of rapidly generating sulfur as required for the sulfur based thermochemical energy storage technology.

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Development and test of a solar reactor for decomposition of sulphuric acid in thermochemical hydrogen production

Cited by 45 publications

References 4 publications

Sulphur based thermochemical cycles: Development and assessment of key components of the process

Sulphur based thermochemical cycles: Development and assessment of key components of the process

Solar hydrogen production with cerium oxides thermochemical cycle

Sulfur dioxide disproportionation for sulfur based thermochemical energy storage

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