A whole-process method and device for thermochemical sulfur-iodine cycle hydrogen production

Abstract

The invention discloses a method and a device for the whole process of thermochemical sulfur-iodine cycle hydrogen production. The present invention combines the Bunsen reaction section with HIx and H 2 SO 4 The two-phase separation section is coupled together, coupling the HIx purification section and the concentration section. h 2 SO 4 The high-temperature mixed gas of the decomposition tower is directly passed into the H 2 SO 4 In the concentration tower, under the condition of no external heat source, H 2 SO 4 A large amount of water in the solution vaporizes rapidly to achieve concentrated H 2 SO 4 The purpose of the solution: the high-temperature mixed gas continues to enter the downstream HIx purification and concentration tower, and a large amount of water in the HIx system is vaporized and taken away to achieve the purpose of concentrating the HI solution. H inclusion in HIx system 2 SO 4 Converted to SO in an oxygen-enriched environment 2 It is taken away to achieve the purpose of purifying the HI solution. After the hydrogen is separated in the condensation tower, the remaining iodine-containing liquid is reused and returned to the Bunsen reaction separation tower, which can reduce the investment and energy consumption of hydrogen production by more than 40% compared with the traditional sulfur-iodine preparation.

Description

technical field [0001] The invention relates to iodine cycle hydrogen production technology, belongs to the technical field of thermochemical cycle hydrogen production, in particular to a method and device for the whole process of thermochemical sulfur iodine cycle hydrogen production. Background technique [0002] Hydrogen energy is one of the cleanest energy sources. Not only is hydrogen itself non-toxic and harmless, but the only product produced during the utilization process is water, and there is no emission of pollutants such as carbon dioxide. Hydrogen has high energy density and high conversion efficiency. In addition to being used as energy, hydrogen is also an important chemical raw material. Every year, more than half of the world's hydrogen is used in important chemical processes such as ammonia synthesis and petroleum cracking. Hydrogen is a secondary energy that needs to be produced from primary energy. Water can produce hydrogen through thermal dissociatio...

AI Technical Summary

Problems solved by technology

However, the equipment system of the traditional iodine-sulfur cycle is very complex and huge, including the Bunsen reaction tower, liquid-liquid separation tower, HI and H 2 SO 4 Purification tower, condensation tower, several HIs and Hs 2 SO 4 Distillation column, HI and H 2 SO 4 Decomposition tower and buffer tank, multiple heaters, etc.

Moreover, the S generated during the HIx phase purification process will not only block the pipeline but also may cause catalyst poisoning in the subsequent HI decomposition tower, seriously affecting the service life of the catalyst

At the same time the presence of excess water in the system requires distillation for HI solution and H 2 SO 4 The concentration of the solution consumes a lot of energy

And from H 2 SO 4 High temperature SO produced in the decomposition tower 2 ,O 2 The mixed gas must be cooled before entering the Bunsen reaction tower, which causes a waste of energy

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