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Technique for continuously producing high purity hydrogen by water electrolysis

A technology of water electrolysis and high-purity hydrogen, applied in the electrolysis process, electrolysis components, cells, etc., can solve the problems such as the impact of high-purity hydrogen recovery rate, achieve high recovery rate, high recovery rate, and low investment effect

Active Publication Date: 2009-04-15
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional water electrolysis hydrogen production and oxygen by-product device, dissolved nitrogen and other gaseous impurities enter the electrolytic cell with the water, and finally enter the product hydrogen and oxygen, which need to be purified by pressure swing adsorption to remove nitrogen and other gaseous impurities , to obtain high-purity hydrogen, so the recovery rate of high-purity hydrogen will be affected

Method used

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  • Technique for continuously producing high purity hydrogen by water electrolysis
  • Technique for continuously producing high purity hydrogen by water electrolysis
  • Technique for continuously producing high purity hydrogen by water electrolysis

Examples

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Embodiment 1

[0040] In this embodiment, the continuous production of water electrolysis conforms to the national GB / T 7445 high-purity hydrogen industrial device for water electrolysis hydrogen production. The rated hydrogen production capacity is 60Nm 3 / h, the hydrogen output pressure is 1.2MPa, the output purity varies with the operating conditions, the lowest is 99.6%, and the highest can reach 99.9%. After the device was repurchased, it was modified to produce high-purity hydrogen: an oxygen inlet and an oxygen flow meter 2 were added to the inlet of the raw water, a packing pipe 1 filled with stainless steel mesh was used as a bubbling denitrification pipe, and the raw water tank 4 was Change the opening into a seal, and connect a water-sealed tank 3 through a pipeline on the top of the water tank, so that the air on the water surface of the raw water tank is emptied through the water-sealed tank 3, see figure 1 .

[0041] The high-purity hydrogen continuous production process of th...

Embodiment 2

[0049] In this embodiment, the continuous production of water electrolysis meets the national standard GB / T 7445 high-purity hydrogen. The rated hydrogen production capacity of the water electrolysis hydrogen production industrial device is 100Nm 3 / h, the hydrogen output pressure is 3.2MPa, the output purity varies with the operating conditions, the lowest is 99.6%, and the highest can reach 99.9%. After installation, acceptance and trial production of the device for a period of time, it will be modified to produce high-purity hydrogen: add an oxygen inlet and oxygen flow meter 2 at the raw water inlet, see figure 2 .

[0050] The high-purity hydrogen continuous production process of this embodiment mainly includes the following steps:

[0051] (1) Removal of dissolved gas in raw water: at normal temperature and pressure, the flow rate is 0.2-1.0Nm 3 / h of oxygen in the raw water tank 4 is used to blow back the raw water by bubbling to remove nitrogen and other gaseous imp...

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Abstract

The invention discloses a technology for continuously producing high-purity hydrogen by water electrolysis, which utilizes soft water deprived of dissolved air as a raw material and finally obtains a high-purity hydrogen product conforming to the national standard GB / T 7445 by electrolysis, catalytic deoxidization and adsorption dewatering. The main steps are as follows: (1) the deprivation of the dissolved air in water: a small amount of oxygen is adopted to carry out counter-current bubbling back blowing to the raw material water so as to deprive nitrogen and other dissolved gases in the water; (2) water electrolysis: an industrial electrolysis unit is used for electrolyzing the nitrogen-deprived soft water, and industrial electrolysis hydrogen is obtained from the cathode of an electrobath; (3) catalytic deoxidization: Pd or Pt is taken as a catalyst, and the H and O in hydrogen are electrolyzed to react and generate water; and (4) dewatering and drying: the molecular sieve constant pressure temperature swing adsorption technology is adopted to deprive the water in the hydrogen so as to obtain the high-purity hydrogen. The technology is the improvement of the existing industrial hydrogen producing technology by electrolysis, and can continuously produce high-purity hydrogen, with the advantages of low investment, no environment pollution and high hydrogen recovery rate.

Description

technical field [0001] The invention belongs to the technical field of industrial hydrogen production, in particular to a process for continuously producing high-purity hydrogen by electrolysis of water. Background technique [0002] Hydrogen with a purity higher than 99.999% is called high-purity hydrogen, and high-purity hydrogen products are usually produced by purifying industrial hydrogen. Industrial hydrogen is mostly produced from fossil fuels, and the main methods used include hydrocarbon steam reforming, partial oxidation, and coal gasification. Comprehensive statistical data show that for hydrogen used as a chemical raw material, its production methods are roughly as follows: steam conversion or partial oxidation of natural gas or liquid hydrocarbons accounts for 77%, coal gasification accounts for 18%, and other methods account for 5%. In addition, in order to meet the large demand for hydrogen in the petroleum refining process, the by-produced hydrogen in the re...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B9/00
CPCY02E60/366Y02E60/36Y02P20/129
Inventor 黄建彬王少楠周鹏云陈雅丽
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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