Galvanically Isolated Electrolyzer Pipes Reduce Stray Current

Solution Overview

Problem

Electrolyzers with stacked cell elements experience premature aging and failure due to excessive electrical stray currents, which increase local current density near feed and discharge lines.

Innovation Solution

The electrolyzer incorporates feed and discharge pipes with galvanically isolated partial lines, extending in counter or same directions to the electrolyte flow, effectively lengthening the current path for stray currents without increasing pipe length.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the feed lines and discharge lines are lengthened to increase electrical resistance, then electrical stray currents are reduced, but flow resistance increases and material requirement increases

Engineering Contradiction:

Improveelectrical stray current reductionVSAvoidflow resistance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The feed line and discharge line are divided into multiple parallel partial lines (at least two) that are galvanically isolated from each other. This segmentation increases the electrical resistance for stray current paths while maintaining adequate cross-sectional area for electrolyte flow, thereby reducing electrical stray currents without excessively increasing flow resistance or material requirements.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the feed lines and discharge lines are lengthened to increase electrical resistance, then electrical stray currents are reduced, but material requirement increases

Engineering Contradiction:

Improveelectrical stray current reductionVSAvoidmaterial requirement

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The feed line and discharge line are divided into multiple parallel partial lines (at least two) that are galvanically isolated from each other. This segmentation increases the electrical resistance for stray current paths while maintaining adequate cross-sectional area for electrolyte flow, thereby reducing electrical stray currents without excessively increasing flow resistance or material requirements.

Inventive Principle:

Principle #1Segmentation

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

This configuration reduces electrical stray current density by increasing ohmic resistance, thereby prolonging the lifespan of the electrolyzer and preventing stack failure.

Implementation Method 1

This configuration reduces electrical stray current density by increasing ohmic resistance

Methodology Applied

Scientific EffectOhmic resistance: Electrical Resistance

Implementation Method 2

anode and cathode half-spaces are separated by means of diaphragms (or membranes) which enable electrical conductivity (ion and/or proton exchange)

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20250051944A1Electrolyzer, use for an electrolyzer, feed pipe for an electrolyzer and discharge pipe for an electrolyzer

Publication Date: 2025.02.13 SIEMENS ENERGY GLOBAL GMBH & CO KG

AI summary

An electrolyzer with a plurality of cell elements, and with a feed pipe and a discharge pipe for feeding and discharging electrolyte to and from the cell elements, wherein the feed pipe and/or the discharge pipe have, at least in some sections, at least two electrically isolated part-lines, wherein the part-lines extend in the feed pipe over a predetermined length in the opposite direction to the direction of electrolyte flow and/or extend in the discharge pipe over a predetermined length in the same direction as the direction of electrolyte flow.