Electrolyser Fluid Quality Unit for Corrosion Control
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Solution Overview
Problem
Electrolysers face issues with corrosion and contamination due to the use of deionized water, leading to reliability and efficiency concerns, as well as potential damage and performance losses from poorly soluble salts and contamination.
Innovation Solution
An electrochemical device with a fluid quality unit positioned upstream of the cell unit to process and purify the fluid, including desalination and filtration, to maintain high fluid quality and prevent contamination, along with a monitoring system to adjust operating parameters based on fluid quality parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If deionized water is used in the electrolyser, then water purity is improved, but corrosion of stainless steel lines increases leading to contamination
Solution Approach 1:
The patent introduces an intermediary substance (organic acid such as formic acid, acetic acid, or citric acid) into the deionized water to act as a corrosion inhibitor. This intermediary prevents direct corrosive interaction between the deionized water and stainless steel components, thereby eliminating contamination while preserving water purity. The organic acid forms protective layers on metal surfaces and suppresses electrochemical corrosion reactions.
Solution Approach 2:
The patent changes the chemical composition parameters of the water by adding specific organic acids in controlled concentrations (typically 0.1-10 mM). This parameter modification transforms the water from a purely inorganic electrolyte-free solution to an organic-acid-modified deionized water that maintains low conductivity while providing corrosion protection through complexation and passivation mechanisms.
2Device complexity
If fluid quality units are placed far from the cell unit, then device complexity is reduced, but fluid contamination occurs during transport
Solution Approach 1:
The patent applies preliminary action by adding corrosion inhibitors and performing fluid quality processing immediately before the water enters the electrolyser cell unit. The fluid quality unit is strategically positioned upstream in close proximity to the cell, ensuring that protection measures are already in place before the deionized water contacts sensitive components, preventing contamination during the final transport segment.
3Ease of manufacture
If stainless steel lines are used for fluid transport, then ease of manufacture is improved, but corrosion leads to ion contamination
Solution Approach 1:
The patent uses organic acids as intermediary substances that form protective films on stainless steel surfaces, preventing direct contact and corrosive interaction between the deionized water and metal. This intermediary layer eliminates ion release into the water while allowing the water to flow through the same stainless steel infrastructure, maintaining ease of manufacture while preventing contamination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures high reliability and efficiency, preventing damage and performance losses by maintaining fluid quality, allowing safe operation even during contamination events, and avoiding issues from prolonged idle modes.
Implementation Method 1
the fluid quality unit (22) which is provided for processing the fluid
Implementation Method 2
including desalination and filtration, to maintain high fluid quality and prevent contamination
Implementation Method 3
which is provided for carrying out at least one at least partially electrochemical work step
Implementation Method 4
at least one chemical reaction takes place which is linked to an electric current, in particular a redox reaction
Data Source
Figure 1~2
AI summary
The invention relates to an electrochemical device, in particular an electrolysis device, and in particular a polymer electrolyte membrane electrolysis device, with at least one cell unit (12) comprising at least one electrochemical cell (14, 16), and with at least one fluid supply (18) for supplying the cell unit (12) with at least one fluid flowing in at least one direction (20). It is proposed that the fluid supply (18) includes at least one fluid quality unit (22) for conditioning the fluid, which is arranged upstream of the cell unit (12) in the direction of flow (20), at least partially in the immediate vicinity (24) of the cell unit (12).