Abstract:Summary
To improve the sulfur‐iodine (SI or IS) cycle for renewable hydrogen production, direct electrolysis of HIx solution (HI‐I2‐H2O) from Bunsen reaction has been recently proposed. This work concerns the detailed microscopic physical performance and electrolytic processes of HIx electrolysis through theoretical simulation and experimental exploration. A two‐dimensional mathematical model of the electrolytic cell for HIx electrolysis was developed, and was verified by the relevance between the simulated an… Show more
“…In particular, the iodine-sulfur (IS) cycle, a wellknown and promising cycle, is considered the most suitable for coupling with a VHTR to achieve efficient hydrogen production. [13][14] An illustration of the IS cycle is shown in Figure 1, which includes three reaction processes. The first process is a spontaneous and exothermic Bunsen reaction, and the products are H 2 SO 4 and HI.…”
Section: Introductionmentioning
confidence: 99%
“…The thermochemical water‐splitting cycle is an important research direction for nuclear hydrogen production. In particular, the iodine–sulfur (IS) cycle, a well‐known and promising cycle, is considered the most suitable for coupling with a VHTR to achieve efficient hydrogen production 13‐14 . An illustration of the IS cycle is shown in Figure 1, which includes three reaction processes.…”
Summary
Nuclear energy enables large‐scale carbon‐free hydrogen production, and the coupling of the very‐high‐temperature gas‐cooled reactor and iodine–sulfur (IS) cycle has the potential to achieve efficient hydrogen production. This study develops the flowsheet of IS process, performs process simulation, designs the internal heat exchange network using pinch point technology, and discusses the thermal efficiency of hydrogen production in detail. The results show that if all heat released by heat exchangers in H2SO4 and HI sections can be fully recovered and utilized, the upper bound of the thermal efficiency of the IS process is 51.9%. The pinch point temperature difference has little impact on the performance of the heat exchange network of the H2SO4 section, but greatly influences the performance of the heat exchange network of the HI section. When the pinch point temperature difference is 5°C to 20°C, the input heat duties required by the H2SO4 and HI sections are reduced by 23.9% to 25.0% and 20.8% to 50.8%, respectively, compared with those without heat exchange networks. After designing the heat exchange network, considering the recovery and utilization of a portion of waste heat, a more realistic hydrogen production efficiency of 30.0% to 37.1% corresponding to the pinch point temperature difference of 5°C to 20°C is given.
Highlights
Process simulation of IS cycle is conducted to analyze its energy consumption.
Internal heat exchange network is designed using pinch point technology.
Network performance is studied at different pinch point temperature differences.
Thermal efficiency of hydrogen production is discussed in detail.
“…In particular, the iodine-sulfur (IS) cycle, a wellknown and promising cycle, is considered the most suitable for coupling with a VHTR to achieve efficient hydrogen production. [13][14] An illustration of the IS cycle is shown in Figure 1, which includes three reaction processes. The first process is a spontaneous and exothermic Bunsen reaction, and the products are H 2 SO 4 and HI.…”
Section: Introductionmentioning
confidence: 99%
“…The thermochemical water‐splitting cycle is an important research direction for nuclear hydrogen production. In particular, the iodine–sulfur (IS) cycle, a well‐known and promising cycle, is considered the most suitable for coupling with a VHTR to achieve efficient hydrogen production 13‐14 . An illustration of the IS cycle is shown in Figure 1, which includes three reaction processes.…”
Summary
Nuclear energy enables large‐scale carbon‐free hydrogen production, and the coupling of the very‐high‐temperature gas‐cooled reactor and iodine–sulfur (IS) cycle has the potential to achieve efficient hydrogen production. This study develops the flowsheet of IS process, performs process simulation, designs the internal heat exchange network using pinch point technology, and discusses the thermal efficiency of hydrogen production in detail. The results show that if all heat released by heat exchangers in H2SO4 and HI sections can be fully recovered and utilized, the upper bound of the thermal efficiency of the IS process is 51.9%. The pinch point temperature difference has little impact on the performance of the heat exchange network of the H2SO4 section, but greatly influences the performance of the heat exchange network of the HI section. When the pinch point temperature difference is 5°C to 20°C, the input heat duties required by the H2SO4 and HI sections are reduced by 23.9% to 25.0% and 20.8% to 50.8%, respectively, compared with those without heat exchange networks. After designing the heat exchange network, considering the recovery and utilization of a portion of waste heat, a more realistic hydrogen production efficiency of 30.0% to 37.1% corresponding to the pinch point temperature difference of 5°C to 20°C is given.
Highlights
Process simulation of IS cycle is conducted to analyze its energy consumption.
Internal heat exchange network is designed using pinch point technology.
Network performance is studied at different pinch point temperature differences.
Thermal efficiency of hydrogen production is discussed in detail.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.