Process modelling and heat management of the solar hybrid sulfur cycle

Niehoff, Alejandro Guerra; Botero, Nicolas Bayer; Acharya, Anirudh Budnar; Thomey, Dennis; Roeb, Martin; Sattler, Christian; Pitz‐Paal, Robert

doi:10.1016/j.ijhydene.2015.01.168

Cited by 14 publications

(3 citation statements)

References 18 publications

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“…considering different boundaries and viewing factors of a cavity design. A coupling to overall process models as reported in [28] will allow analysing yearly yields and costs of a directly irradiated, solar HyS-process.…”

Section: Discussionmentioning

confidence: 99%

Thermodynamic Model of a Solar Receiver for Superheating of Sulfur Trioxide and Steam at Pilot Plant Scale

Niehoff

Thomey

Gonzales

et al. 2016

Volume 1: Biofuels, Hydrogen, Syngas, and Alternate Fuels; CHP and Hybrid Power and Energy Systems; Concentrating Solar Power;

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Within the European research project SOL2HY2, key components for a solar hybrid sulfur cycle are being developed and demonstrated at pilot scale in a real environment. Regarding the thermal portion, a plant for solar sulfuric acid decomposition is set up and initially operated at the research platform of the DLR Solar Tower in Jüulich, Germany. One major component is the directly irradiated volumetric receiver, superheating steam and SO3 coming from a tube-type evaporator to above 1000 °C. At the design flow rate of sulfuric acid (50%-wt.) of 1 l/min, a nominal solar power of 57 kW is required at the receiver. With a flat ceramic absorber made from SiC and a flat quartz glass window, the design is based on lab scale reactors successfully demonstrated at the solar furnace of the German Aerospace Centre (DLR) in Cologne, Germany. A flexible lumped thermodynamic tool representing the receiver, compiled to assess different configurations, is presented in detail. An additional raytracing model has been established to provide the irradiation boundaries and support the design of a conical secondary concentrator with an aperture diameter of 0.6 m. A comparison with first experimental data (up to 65% nominal power), obtained during initial operation, indicates the models to be viable tools for design and operational forecast of such systems. With a provisional method to account for the efficiency of the secondary concentrator, measured fluid outlet temperatures (up to 1000 °C) are predicted with deviations of ±60 °C. Respective absorber front temperatures (up to 1200 °C) are under-predicted by 100–200 °C, with lower deviations at higher mass flows. The measured window temperature (up to 700 °C) mainly depends on the absorber front temperature level, which is well predicted by the model.

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Section: Discussionmentioning

confidence: 99%

Thermodynamic Model of a Solar Receiver for Superheating of Sulfur Trioxide and Steam at Pilot Plant Scale

Niehoff

Thomey

Gonzales

et al. 2016

Volume 1: Biofuels, Hydrogen, Syngas, and Alternate Fuels; CHP and Hybrid Power and Energy Systems; Concentrating Solar Power;

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“…Guerra Niehoff et al [23] chose the second alternative when they proposed a solar HyS process with a sulfuric acid decomposition section that operates diurnally while the rest of the process runs continually. Their approach relies on large storage tanks to accumulate and dispense three intermediate streams for integrated operation.…”

Section: Introductionmentioning

confidence: 99%

“…However, direct heating of the sulfuric acid vaporizer and high-temperature decomposition reactor is possible with the chemical storage option. For Solar hybrid sulfur cycle process development page 5 of 52 example, Guerra Niehoff et al's design places both the vaporizer and reactor at the focal point of a solar concentrator [23]. While direct heating is inherently simpler, the resulting extreme diurnal temperature swings as well as the shorter transients due to cloud cover raise concerns about thermal fatigue in components that handle highly corrosive fluids.…”

Section: Introductionmentioning

confidence: 99%

Development of the hybrid sulfur cycle for use with concentrated solar heat. I. Conceptual design

Gorensek

Corgnale

Summers

2017

International Journal of Hydrogen Energy

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Development of the hybrid sulfur cycle for use with concentrated solar heat input Highlights  Design options evaluated for hybrid sulfur cycle water-splitting using solar heat  Indirect solar heating with thermal energy storage using falling particle receiver  Continuous operation with liquid-fed electrolyzer, bayonet acid decomposer  Detailed flowsheet with material and energy balances prepared and presented  35.0% LHV cycle efficiency, 17.0% solar-to-H 2 conversion ratio estimated *Highlights (for review)

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Electrochemical Hydrogen Production from SO₂and Water in a SDE Electrolyzer

Krüger

Kerres

Krieg

et al. 2017

Hydrogen Production Technologies

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Process modelling and heat management of the solar hybrid sulfur cycle

Cited by 14 publications

References 18 publications

Thermodynamic Model of a Solar Receiver for Superheating of Sulfur Trioxide and Steam at Pilot Plant Scale

Thermodynamic Model of a Solar Receiver for Superheating of Sulfur Trioxide and Steam at Pilot Plant Scale

Development of the hybrid sulfur cycle for use with concentrated solar heat. I. Conceptual design

Electrochemical Hydrogen Production from SO₂and Water in a SDE Electrolyzer

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Process modelling and heat management of the solar hybrid sulfur cycle

Cited by 14 publications

References 18 publications

Thermodynamic Model of a Solar Receiver for Superheating of Sulfur Trioxide and Steam at Pilot Plant Scale

Thermodynamic Model of a Solar Receiver for Superheating of Sulfur Trioxide and Steam at Pilot Plant Scale

Development of the hybrid sulfur cycle for use with concentrated solar heat. I. Conceptual design

Electrochemical Hydrogen Production from SO2and Water in a SDE Electrolyzer

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Product

Resources

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Electrochemical Hydrogen Production from SO₂and Water in a SDE Electrolyzer