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

A full-process, thermochemical technology, applied in chemical instruments and methods, inorganic chemistry, hydrogen, etc., can solve problems such as energy consumption, blocked pipelines, catalyst poisoning, etc., to prevent I2 precipitation, reduce investment and energy consumption, and improve conversion rate effect

Active Publication Date: 2022-05-13
浙江百能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Effect test

Embodiment 1

[0052] The initial temperature in the Bunsen reaction separation tower is 85°C under normal pressure, and the feed in the tower is 10 mol H 2 SO 4 , 20 mol HI, 10 mol SO 2 ,20mol I 2 ,120mol water. SO after 1.5h reaction 2 The conversion rate reaches 95%. The two phases were left to stand for 20 minutes to separate, and respectively entered into H 2 SO 4 system and HIx system. h 2 SO 4 Phase and HIx phase outlet temperatures were 85 °C.

[0053] h 2 SO 4 The phase composition is H 2 SO 4 4.7 mol / kg, HI 0.34 mol / kg, I 2 0.115 mol / kg, H 2 O 25.9 mol / kg. Liquid phase mixture from H 2 SO 4 Spraying at the top of the concentration tower, during the descent with 2 SO 4 SO in decomposition tower 2 and O 2 When the high-temperature steam meets, the liquid water is quickly vaporized and taken away. High temperature mixed gas (450-500°C) from H 2 SO 4 The top of the concentration tower enters the HIx purification and concentration tower through the action of a...

Embodiment 2

[0061] The initial temperature in the Bunsen reaction separation tower is 85°C under normal pressure, and the feed in the tower is 10 mol SO 2 ,34 mol I 2 ,105mol water. SO after 1.5h reaction 2 The conversion rate reaches 95%. The two phases were left to stand for 20 min to separate, and respectively entered into H 2 SO 4 system and HIx system. h 2 SO 4 Phase and HIx phase outlet temperatures were 85 °C.

[0062] h 2 SO 4 The phase composition is H 2 SO 4 4.6 mol / kg, HI 0.3 mol / kg, I 2 0.07 mol / kg, H 2 O 27.4 mol / kg. Liquid phase mixture from H 2 SO 4 Spraying at the top of the concentration tower, during the descent with 2 SO 4 SO in decomposition tower 2 and O 2 When the high-temperature steam meets, the liquid water is quickly vaporized and taken away. High temperature mixed gas (450-500°C) from H 2 SO 4 The top of the concentration tower enters the HIx purification and concentration tower through the action of a fan. h 2 SO 4 Concentration towe...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/04
CPCC01B3/042
Inventor 张相何春晓常涛赵琛杰于晓莎
Owner 浙江百能科技有限公司
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