Optimization and comparison of two improved very high temperature gas-cooled reactor-based hydrogen and electricity cogeneration systems using iodine-sulfur cycle

Wang, Qi; Liu, Chunyu; Li, Dantong; Macián‐Juan, Rafael

doi:10.1016/j.ijhydene.2022.02.237

Cited by 20 publications

(8 citation statements)

References 48 publications

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“…The energy consumption of the mixing and separation process is small and negligible, so the energy consumption of the entire Bunsen section can be ignored 39 . Wang et al 41 also indicated that more than 99% of the energy consumption of the IS process is occupied by the H 2 SO 4 and HI sections. Therefore, this study discusses the thermal efficiency of hydrogen production and designs the heat exchange network based on the energy consumption and the flowsheets of H 2 SO 4 and HI sections.…”

Section: Upper Bound Of Thermal Efficiency For Hydrogen Productionmentioning

confidence: 99%

“…Guo et al 45 reported that a vapor distillate could save a quarter to a third of energy compared with a liquid distillate, and the main energy saving occurred in the vaporization process in the HI decomposition reactor. Although the theoretical equilibrium conversion rate of HI decomposition reaction is around 22% at 450°C, many studies on process simulation and conceptual design of IS cycle have mentioned and adopted HI membrane reactors, which markedly promote the conversion of HI 32,36,38,41,43,46 . Some studies have also been conducted specifically on membrane reactors for HI decomposition.…”

Section: Description Of Is Cycle and Process Simulationmentioning

confidence: 99%

“…Although the theoretical equilibrium conversion rate of HI decomposition reaction is around 22% at 450 C, many studies on process simulation and conceptual design of IS cycle have mentioned and adopted HI membrane reactors, which markedly promote the conversion of HI. 32,36,38,41,43,46 Some studies have also been conducted specifically on membrane reactors for HI decomposition. Bhushan et al 47 reported that a single-pass conversion of 94.7% of HI to hydrogen could be achieved using a Tantalum membrane reactor.…”

Section: Process Simulation and Parameter Settingsmentioning

confidence: 99%

“…Based on the above process simulation, we focus on the energy consumption of the IS process and discuss the thermal efficiency of hydrogen production. For the Bunsen section, the Bunsen reaction is exothermic and spontaneous, and the heat released by the Bunsen reactor R‐1″ is considered to be discharged directly to the environment and is not considered recyclable like the heat released by heat exchangers 41 . The energy consumption of the mixing and separation process is small and negligible, so the energy consumption of the entire Bunsen section can be ignored 39 .…”

Section: Upper Bound Of Thermal Efficiency For Hydrogen Productionmentioning

confidence: 99%

“…The results showed a variation range for the energy efficiency of 15.3% to 31.0%. Wang et al 41 estimated the thermal efficiency of IS cycle to be in the range of 17.7% to 43.3%, with a conservative thermal efficiency of 23.7%.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of internal heat exchange network and hydrogen production efficiency of iodine–sulfur cycle for nuclear hydrogen production

Peng

et al. 2022

Intl J of Energy Research

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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.

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Section: Upper Bound Of Thermal Efficiency For Hydrogen Productionmentioning

confidence: 99%

Section: Description Of Is Cycle and Process Simulationmentioning

confidence: 99%

Section: Process Simulation and Parameter Settingsmentioning

confidence: 99%

Section: Upper Bound Of Thermal Efficiency For Hydrogen Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of internal heat exchange network and hydrogen production efficiency of iodine–sulfur cycle for nuclear hydrogen production

Peng

et al. 2022

Intl J of Energy Research

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Design and analysis of an iodine‐sulfur thermochemical cycle‐based hydrogen production system with an internal heat exchange network

Wang

Macián‐Juan

2022

Intl J of Energy Research

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The iodine-sulfur (I-S) cycle is one of the most promising thermochemical cycles to produce carbon-free hydrogen on a large scale. The employment of an efficient internal heat exchange network is very essential for the efficiency improvement of the I-S cycle, however, detailed research on this topic is seldomly reported. To enrich the existing research content, an I-S cycle-based hydrogen production system with an internal heat exchange network is proposed in this paper using Aspen Plus. The internal heat exchange network is designed by following the energy cascade utilization principle, and three sets of different heat transfer constraints corresponding to different temperature zones are imposed in the design process. The simulation results show that for the proposed I-S system, more than half of the system energy consumption is used by the distillation processes of two acid solutions, and more than 40% of the system energy consumption is used by the HI concentration and distillation process. Using the internal heat exchange network, about 422 kJ of waste heat (for 1 mol of hydrogen production) can be recovered and the system thermal efficiency is improved by about 4.9%. In addition, an efficiency improvement of about 11.8% can be achieved when the waste heat from the condensers of two distillation columns is completely recovered. In general, the thermal efficiency of the proposed I-S system is estimated to be in the range of 15.8% to 49.8%, and after adopting several common waste heat recovery measures, the system can achieve a promising thermal efficiency of approximately 36.7%.

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Process modelling and assessment of thermochemical sulfur-iodine cycle for hydrogen production considering Bunsen reaction kinetics

Yang,

Ying,

Zhao

et al. 2024

Chemical Engineering and Processing - Process Intensification

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Optimization and comparison of two improved very high temperature gas-cooled reactor-based hydrogen and electricity cogeneration systems using iodine-sulfur cycle

Cited by 20 publications

References 48 publications

Analysis of internal heat exchange network and hydrogen production efficiency of iodine–sulfur cycle for nuclear hydrogen production

Analysis of internal heat exchange network and hydrogen production efficiency of iodine–sulfur cycle for nuclear hydrogen production

Design and analysis of an iodine‐sulfur thermochemical cycle‐based hydrogen production system with an internal heat exchange network

Process modelling and assessment of thermochemical sulfur-iodine cycle for hydrogen production considering Bunsen reaction kinetics

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