Thermal chemical sulfur-iodine circulating hydrogen production full-process method and device

Abstract

The invention discloses a thermochemical sulfur-iodine circulating hydrogen production whole-process method and device. According to the invention, a Bunsen reaction section is coupled with an HIx and H2SO4 two-phase separation section, and an HIx purification section is coupled with a concentration section. High-temperature mixed gas of the H2SO4 decomposition tower is directly introduced into the H2SO4 concentration tower, and a large amount of water in the H2SO4 solution is quickly vaporized under the condition of no external heat source, so that the purpose of concentrating the H2SO4 solution is achieved; the high-temperature mixed gas continues to enter a downstream HIx purification and concentration tower, a large amount of water in an HIx system is vaporized and taken away, and the purpose of concentrating the HI solution is achieved. H2SO4 mingled in an HIx system is converted into SO2 in an oxygen-enriched environment and is taken away, so that the purpose of purifying the HI solution is achieved. After hydrogen in the condensing tower is separated, the residual iodine-containing liquid is recycled and returns to the Bunsen reaction separation tower, and the investment and the energy consumption can be reduced by more than 40% compared with the traditional sulfur-iodine hydrogen preparation method.

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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