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A high-temperature gas-cooled reactor coupling iodine-selenium thermochemical cycle sulfur reduction hydrogen production method

A thermochemical cycle and high-temperature gas-cooled reactor technology, applied in chemical instruments and methods, inorganic chemistry, hydrogen, etc., can solve the problems of high energy consumption, heat, high temperature, etc., and achieve the effect of reducing production costs

Active Publication Date: 2021-04-09
CHINERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the sulfur-iodide cycle hydrogen production method is that the decomposition reaction of sulfuric acid still requires a relatively high temperature, and it is still on a laboratory scale, which consumes a lot of energy and heat.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052](1) Take the water as a raw material, the addition of selenium and iodine, the molar ratio of the reaction, water, selenium and iodine is: water: selenium: iodine = 1: 0.4: 1, the reaction temperature is 25 ° C, the reaction time is 60min, the complete mark of the reaction is no longer generating gas, the reaction is obtained from selenite solution and hydroiodic acid, and the reaction equation is as follows:

[0053]3h2O + SE + 2i2→ h2SEO3+ 4hi

[0054]The above-mentioned hydroiodol and selenic acid are significantly stratified, and the hydroiodic acid is in the upper layer and the selenite solution in the upper layer. The liquid liquid separation and hydroiodic acid were separated by liquid separation method using a liquid separation method to obtain selenite solution and hydroiodine;

[0055](2) The following components are included in the hydroiodic acid obtained by step (1): i2Hi and h2O, mixed trial solution is a HIX solution. The HIX solution enters the HI distillation decomposi...

Embodiment 2

[0063](1) Take water as a raw material, add selenium and iodine, react to normal pressure, water, selenium and iodine: water: selenium: iodine = 1: 0.5: 1.2, reaction temperature is 28 ° C, reaction time is 50min, the complete mark of the reaction is no longer generated, the reaction is obtained from the selenite solution and hydroiodic acid, the reaction equation is as follows:

[0064]3h2O + SE + 2i2→ h2SEO3+ 4hi

[0065]The above-mentioned hydroiodol and selenic acid are significantly stratified, and the hydroiodic acid is in the upper layer and the selenite solution in the upper layer. The liquid liquid separation and hydroiodic acid were separated by liquid separation method using a liquid separation method to obtain selenite solution and hydroiodine;

[0066](2) The following components are included in the hydroiodic acid obtained by step (1): i2Hi and h2O, mixed trial solution is a HIX solution. The HIX solution enters the HI-Distillation decomposition unit for rectification, the rect...

Embodiment 3

[0074](1) Take water as a raw material, add selenium and iodine, reacting, water, selenium and iodine molar ratio: water: selenium: iodine = 1: 1.6: 3.7, the reaction temperature is 25 ° C, the reaction time is 60min, the complete mark of the reaction is no longer generating gas, the reaction is obtained from selenite solution and hydroiodic acid, and the reaction equation is as follows:

[0075]3h2O + SE + 2i2→ h2SEO3+ 4hi

[0076]The above-mentioned hydroiodol and selenic acid are significantly stratified, and the hydroiodic acid is in the upper layer and the selenite solution in the upper layer. The liquid liquid separation and hydroiodic acid were separated by liquid separation method using a liquid separation method to obtain selenite solution and hydroiodine;

[0077](2) The following components are included in the hydroiodic acid obtained by step (1): i2Hi and h2O, mixed trial solution is a HIX solution. The HIX solution enters the HI distillation decomposition unit for rectification,...

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Abstract

The invention relates to a method for producing hydrogen by iodine-selenium thermochemical cycle sulfur reduction, which belongs to the technical field of hydrogen energy. First, water is used as raw material, selenium and iodine are added, and react under normal pressure to obtain selenous acid solution and hydroiodic acid, carry out rectification and concentration to hydroiodic acid, decompose the hydroiodic acid after rectification and concentration, and decompose to obtain Hydrogen is output as a product, iodine is recycled, and reducing agent sulfur or sulfur dioxide or sulfurous acid is added to the obtained selenous acid solution to obtain selenium and by-product output, and selenium is recycled as a raw material. The maximum temperature required for the reaction process of the method of the invention is 400-500° C., which avoids the problem that large-scale hydrogen production cannot be carried out due to too high reaction temperature. The reactants iodine and selenium in the method of the invention can be recycled, thus greatly reducing the production cost of hydrogen production. The method can be well coupled with the latest clean energy high-temperature gas-cooled reactor, and the thermal energy, electrical energy and mechanical energy of the high-temperature gas-cooled reactor can all be utilized by the iodine-selenium thermochemical cycle hydrogen production process.

Description

Technical field[0001]The present invention relates to a high temperature gas-free hepile coupling iodary hydrogen-hydrogenation method, which belongs to the field of hydrogen energy technology.Background technique[0002]Hydrogen can be an ideal cleaning secondary energy, which is widely distributed, and combustion does not produce pollution, and is more convenient to store transport relative to electricity, hydrogen, and can be directly used as a fuel, and the energy system of hydrogen can be increasingly attached. Thermochemical cycle decomposes water hydrogen is one of the most promising methods. The commonly used method of thermochemical circulating hydrogen is sulfur-free, such as the Chinese Patent Application (Application Publication No. CN104817057), which discloses a thermochemical cycle hydrogen, including three chemical reactions, as follows Show:[0003]Bunsen reaction:[0004]SO2+ I2+ 2h2O → 2hi + h2SO4(T = 290-390K)[0005]Sulfuric acid decomposition reaction:[0006]Hide2SO4→ h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/04C01B17/50C01B17/74
CPCC01B3/042C01B17/50C01B17/74C01B2203/0838Y02E60/36
Inventor 孟东旺齐乃烨王春铭
Owner CHINERGY CO LTD
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