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

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

Active Publication Date: 2022-03-18
浙江百能科技有限公司
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  • Description
  • Claims
  • Application Information

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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...

Method used

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

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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 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...

Claims

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Application Information

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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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