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Method and system for detecting contamination in electrolytic cell

A technology for electrolyzers and electrolyzers, applied in general control systems, test/monitoring control systems, electrolysis components, etc., to solve problems affecting membrane life, current efficiency and resistance, and sensitivity to inlet brine purity

Pending Publication Date: 2022-06-03
RECH 2000 INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the disadvantages of using a membrane as a separator in an industrial electrolysis process is that it is sensitive to the purity of the inlet brine
The presence of contaminants in the inlet brine can affect membrane lifetime, current efficiency and electrical resistance

Method used

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  • Method and system for detecting contamination in electrolytic cell
  • Method and system for detecting contamination in electrolytic cell
  • Method and system for detecting contamination in electrolytic cell

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Embodiment Construction

[0077] The widespread use of membranes as electrolysis separators in modern electrolysis industrial processes raises the demands on the purity of the feed electrolyte. Poor control of contaminants in the feed electrolyte can lead to a decrease in membrane current efficiency and an increase in membrane resistance, thereby reducing the sustainability of membrane operation. Contaminants in the feed electrolyte can also degrade electrode performance, especially electrode coating performance, and increase cell voltage. To prevent any membrane and electrode coating damage, such as Ca 2+ , Mg 2+ , Sr 2+ , Ba 2+ , Al 3 + , SO 4 2- , SiO 2 , Fe 3+ , Ni 2+ , I - , F - , CO 3 2- and ClO 3 - and other pollutants should be kept below stringent levels. Poor control of these contaminants can lead to physical destruction of the membrane (bubble formation) or clogging of ion exchange sites, with concomitant increases in voltage and reduced current efficiency, as well as the af...

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Abstract

The invention provides a method for detecting contamination in an electrolysis cell of an electrolyzer, comprising: recording real-time data from the electrolysis cell during operation of the electrolyzer; generating synthetic data based on the historical data of the electrolyzer and the electrolytic bath, wherein the synthetic data comprises a synthetic bath voltage and a synthetic product output flow rate of the electrolyzer, a synthetic anolyte pH value, a feed brine pH value or an oxygen concentration in chlorine; determining a slot-specific k factor or U0 from the historical data; when the difference between the output flow of the synthetic product, the pH value of the synthetic anolyte, the pH value of the feeding saline water or the oxygen concentration in the chlorine gas and the real-time output flow of the product, the pH value of the anolyte, the pH value of the feeding saline water or the oxygen concentration in the chlorine gas exceeds a first threshold value, detecting slow pollution; and detecting a rapid contamination when the cell-specific k-factor or U0 exceeds a second threshold and a trend of a difference between the synthetic cell voltage and the real-time cell voltage or a derivative of the difference satisfies or exceeds a conditional logic rule.

Description

technical field [0001] The present disclosure relates generally to electrolysis processes in which contamination of the feed electrolyte results in changes in cell voltage or electrochemical reaction efficiency, and more particularly to contaminants and in chlor-alkali, water electrolysis, fuel cells Real-time detection of membrane, cell separator and electrode poisoning or performance degradation due to hazardous operating conditions in industrial electrolyzers or any other industrial cell. Background technique [0002] Industrial electrolysis processes such as Chlor-Alkali involve the decomposition of lower value chemicals (eg NaCl, KCl, HCl) into higher value chemicals (eg NaOH, Cl) by applying direct current 2 , KOH). This reaction takes place in an electrochemical cell. In an industrial setting, multiple cells are combined in series or in parallel to carry out the reaction. This combination is called an electrolyzer. [0003] Most industrial electrochemical cells co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/46C25B15/023C25B15/031C25B9/70G06F30/27G06N3/04G06N3/08
CPCC25B1/46C25B15/023C25B15/031C25B9/70G06F30/27G06N3/04G06N3/08G06F2119/08G05B23/0235G05B23/024
Inventor 赛德·贝里赫赫尔穆特·拉泽曼吉勒·J·特伦布雷
Owner RECH 2000 INC