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A system and method for electrolyzing water to produce oxygen based on solid oxide electrolyte

A technology of solid oxide and oxygen production method, which is applied in the electrolysis process, electrolysis components, circuits, etc., can solve the problems of low working temperature, low system efficiency and low life, and achieve the effect of improving life and reducing system cost.

Active Publication Date: 2017-12-08
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, proton exchange membrane electrolytes are mostly used in electrolytic water oxygen production systems. This type of electrolyte has a low operating temperature (<100°C) and good portability, but the system efficiency and service life are low.

Method used

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  • A system and method for electrolyzing water to produce oxygen based on solid oxide electrolyte

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Experimental program
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Embodiment 1

[0039] Such as figure 1As shown, the electric energy generated by wind power is input into the AC / DC converter 1, and the 220V alternating current is converted into 140V direct current through the AC / DC converter 1, and then input into the solid oxide electrolytic cell 2 composed of 100 batteries; At the positive pole of the solid oxide electrolytic cell 2, the 30mol% H from the premixer 3 will be 2 700℃H 2 / H 2 H in O mixture 2 O to H 2 , output 80mol% H 2 800℃H 2 / H 2 O mixed gas, while producing high-purity O at the negative electrode of the solid oxide electrolytic cell 2 2 (O 2 >99.995%); 80mol%H 2 800℃H 2 / H 2 The O mixed gas enters the anode of the solid oxide fuel cell 4, and the H in the mixed gas is converted by electrochemical reaction 2 converted to H 2 O, output 30mol% H 2 900℃H 2 / H 2 O mixed gas, while the cathode of the solid oxide fuel cell 4 consumes O in the high-temperature air from the heat exchanger 2 7 2 At the same time, the solid oxide...

Embodiment 2

[0041] Such as figure 1 As shown, the electric energy generated by solar power is input into the AC / DC converter 1, and the 220V alternating current is converted into 280V direct current through the AC / DC converter 1, and then input into the solid oxide electrolytic cell 2 composed of 200 batteries, 100 solid oxide electrolytic cells work in parallel; at the positive pole of the solid oxide electrolytic cell 2, the 20mol% H from the premixer 3 will be reacted by the positive electrode of the electrolytic cell 2 750℃H 2 / H 2 H in O mixture 2 O to H 2 , output 70mol% H 2 850℃H 2 / H 2 O mixed gas, while producing high-purity O at the negative electrode of the solid oxide electrolytic cell 2 2 (O 2 >99.995%); 70mol%H 2 850℃H 2 / H 2 The O mixed gas enters the anode of the solid oxide fuel cell 4, and the H in the mixed gas is converted by electrochemical reaction 2 converted to H 2 O, output 20mol% H 2 950℃H 2 / H 2 O mixed gas, while the cathode of the solid oxide f...

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Abstract

A system and method for producing oxygen by electrolyzing water based on a solid oxide electrolyte, which converts alternating current into direct current and supplies it to a solid oxide electrolytic cell; provides a poor H2 / H2O mixed gas to the solid oxide electrolytic cell, and outputs rich H2 / H2O mixed gas, high-purity O2 is produced at the negative electrode; the obtained rich H2 / H2O mixed gas is sent to the anode of the solid oxide fuel cell, and the poor H2 / H2O mixed gas is output through electrochemical reaction; the air and the output lean H2 / H2O The mixed gas is sent to the heat exchanger 1, where the lean H2 / H2O mixed gas cools down; after cooling, it is input into the premixer through the pump and mixed with the make-up water; the exhaust gas output from the cathode of the solid oxide fuel cell and the heat exchanger 1 The heated air is sent to the second heat exchanger, and the further heated air is sent back to the cathode to consume the O2 in it. The present invention combines the electrolytic cell with the fuel cell to realize large-scale production of high-purity O2, reduce system cost, and improve electrolysis efficiency. The life of the water oxygen generation system and the ability to use electricity generated by renewable energy sources such as wind / solar.

Description

technical field [0001] The invention belongs to the technical field of oxygen production, and in particular relates to an oxygen production system and method based on solid oxide electrolyte by electrolyzing water. Background technique [0002] There are three main methods for producing high-purity oxygen: (1) cryogenic method; (2) pressure swing adsorption method; (3) electrolytic water oxygen production method. Among them, the electrolytic water oxygen production method has high stability, low energy consumption, and wide application range of capacity. However, at present, proton exchange membrane electrolytes are mostly used in electrolytic water oxygen production systems. This type of electrolyte has low operating temperature (<100°C) and good portability, but the system efficiency and service life are low. In order to overcome the above shortcomings, this patent adopts the method of electrolyzing water with solid oxide electrolyte to produce oxygen, which works at 6...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B9/04C25B9/06H01M8/0656C25B9/17
CPCY02P20/133Y02E60/36Y02E60/50
Inventor 许世森王洪建程健张瑞云王鹏杰任永强
Owner HUANENG CLEAN ENERGY RES INST