Method and device for two-phase separation, concentration and purification in sulfur-iodine circulating hydrogen production

A technology of phase separation and sulfur-iodine, which is applied in the field of two-phase separation, concentration and purification in sulfur-iodine cycle hydrogen production, can solve problems such as catalyst poisoning and energy consumption, and achieve the effects of simplifying the system, reducing energy consumption, and reducing one-time investment costs.

Active Publication Date: 2022-08-05
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

Excess iodine will precipitate and block the pipeline, and the existence of excess water requires rectification for HI solution and H 2 SO 4 The concentration of the solution consumes a lot of energy
At the same time, the traditional two-phase purification method uses the Bunsen reverse reaction, which will generate S, H 2 S and SO 2 And other by-products, it is easy to cause various problems such as subsequent catalyst poisoning

Method used

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  • Method and device for two-phase separation, concentration and purification in sulfur-iodine circulating hydrogen production
  • Method and device for two-phase separation, concentration and purification in sulfur-iodine circulating hydrogen production

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Effect test

Embodiment 1

[0060] The initial temperature in the Bunsen reaction tower was 85 °C and normal pressure, and the feed in the tower was 15 mol I 2 , 10mol SO 2 , 30mol water. SO after 1.5h of reaction 2 The conversion rate is 95%. The mass fraction of each substance in the liquid mixture is: 28.2wt% I 2 , 18.8wt%H 2 SO 4 , 49.1%wt HI, wherein HI / HI+H 2 O+I 2 is 60.5wt%, exceeding HI / HI+H under traditional process 2 O+I 2 Concentration of solution (31.9-35.1wt%); HI / HI+H 2 O is 92.6wt%, exceeding HI / HI+H under traditional process 2 The concentration of O solution (53.8-64wt%) and H at atmospheric pressure 2 O azeotrope (57wt%).

[0061]The liquid mixture in the Bunsen reaction tower is sprayed from the top of the first HI stripper, and the remaining liquid at the bottom of the first HI stripper is sprayed from the top of the second HI stripper; the operating environment in the first HI stripper is 0.7 bar, 70 °C; the operating environment in the second HI stripper is 0.2 bar, 30 ...

Embodiment 2

[0067] The initial temperature in the Bunsen reaction tower is 80 °C and normal pressure, and the feed in the tower is 20 mol I 2 , 10mol SO 2 , 40mol water. SO after 1.5h of reaction 2 The conversion rate is 95%. The mass fraction of each substance in the liquid mixture is: 42.8wt% I 2 , 14.9wt%H 2 SO 4 , 39.5wt% HI, wherein HI / HI+H 2 O+I 2 is 44.3wt%, exceeding HI / HI+H under traditional process 2 O+I 2 Concentration of solution (31.9-35.1wt%); HI / HI+H 2 O is 86.5wt%, which exceeds HI / HI+H under traditional process 2 The concentration of O solution (53.8-64wt%) and H at atmospheric pressure 2 O azeotrope (57wt%).

[0068] The liquid mixture in the Bunsen reaction tower is sprayed from the top of the first HI stripper, and the remaining liquid at the bottom of the first HI stripper is sprayed from the top of the second HI stripper; the operating environment in the first HI stripper is 0.6 bar, 80 °C; the operating environment in the second HI stripper is 0.3 bar, ...

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Abstract

The invention discloses a two-phase separation, concentration and purification method and device in sulfur-iodine cycle hydrogen production, and belongs to the related technical field of hydrogen preparation through thermochemical cycle. According to the invention, gradient separation of HI gas is realized by utilizing gradual reduction of pressure, and the risk of subsequent I2 precipitation and the energy consumption of solution concentration are reduced; heat of high-temperature gas generated by decomposition of H2SO4 is collected through a heat exchanger, so that gradient utilization of energy of the process and the system is realized; the method comprises the following steps: feeding liquid subjected to HI steam stripping into an H2SO4 purification and concentration tower, rapidly vaporizing H2O under the conditions of low pressure and high temperature, reacting HI mixed in an H2SO4 system with H2O2 to generate I2 and H2O, removing I2 in a microporous filter, and achieving the purpose of purifying an H2SO4 solution under the condition of not introducing other impurities; a concentration section and a purification section of H2SO4 are coupled together, so that the whole system is greatly simplified.

Description

technical field [0001] The invention relates to a sulfur-iodine cycle hydrogen production technology, belongs to the related technical field of thermochemical cycle hydrogen production, and in particular relates to a method and a device for two-phase separation, concentration and purification in sulfur-iodine cycle hydrogen production. Background technique [0002] Hydrogen energy is considered to be the most ideal secondary energy, also known as the future energy of mankind. However, traditional hydrogen production methods and technologies are due to the presence of CO 2 Disadvantages such as emissions and low efficiency restrict the development of hydrogen energy. Therefore, research on clean, efficient and sustainable hydrogen production methods has increasingly become the focus of attention. Among the many hydrogen production methods from water splitting, thermochemical cycle hydrogen production is recognized as the most promising hydrogen production method. In 1981, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/04
CPCC01B3/042Y02P20/133
Inventor 赵琛杰于晓莎叶啸张相雷祖磊
Owner 浙江百能科技有限公司
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