Catalytic Hydrogen Removal in Ventilated Cable Junction Boxes

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Solution Overview

Problem

Underwater cables face issues with gas migration, particularly hydrogen, leading to safety hazards such as flammable gas mixtures, pressure buildup, and environmental hazards in cable junction boxes, which existing solutions fail to adequately address.

Innovation Solution

A metal-based catalyst supported on a solid substrate is used to catalyze a hydrogen oxidation reaction, effectively removing hydrogen at low concentrations, preventing flammable gas mixtures, and converting hydrogen to safe water.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If hydrogen is removed by conventional methods, then hydrogen accumulation is prevented, but the system cannot effectively remove hydrogen at low concentrations and may allow flammable gas mixtures to form

Engineering Contradiction:

Improvehydrogen control effectivenessVSAvoidflammable gas mixture formation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the operational parameters of the catalytic converter by optimizing temperature, pressure, and catalyst composition to enable effective hydrogen oxidation at low concentrations (below flammable thresholds). This allows the system to maintain hydrogen levels below 4% in air, preventing flammable mixture formation while ensuring reliable hydrogen removal

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite catalyst materials comprising multiple metal components (such as platinum group metals combined with base metals) supported on ceramic or metallic substrates. These composite structures provide enhanced catalytic activity for hydrogen oxidation at low concentrations, improving reliability of hydrogen control while preventing flammable conditions

Inventive Principle:

Principle #40Composite materials

2Productivity

If catalytic oxidation is used to remove hydrogen, then continuous removal at low concentrations is achieved, but heat generation may occur that could ignite gaseous hydrogen

Engineering Contradiction:

Improvehydrogen removal rateVSAvoidignition risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements heat management measures in advance, including thermal insulation of the catalytic converter, heat sinks, and temperature monitoring systems. These precautions prevent heat accumulation that could lead to hydrogen ignition while maintaining the productivity of continuous hydrogen oxidation at controlled rates

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent introduces inert gases (such as nitrogen or carbon dioxide) as intermediaries to dilute the hydrogen-oxygen mixture entering the catalytic converter. This reduces the concentration of flammable gases and moderates heat generation during oxidation, enabling continuous hydrogen removal at high productivity while eliminating ignition risks

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stress or pressure

If hydrogen is allowed to accumulate and vent to air, then pressure buildup is avoided, but environmental hazards and safety risks increase

Engineering Contradiction:

Improvepressure buildup preventionVSAvoidenvironmental hazards

Core Design Contradiction:

Stress or pressureVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful hydrogen gas into beneficial water through catalytic oxidation. The hydrogen that would otherwise be a safety hazard and environmental pollutant is transformed into harmless water vapor, simultaneously preventing pressure buildup and eliminating environmental hazards in a single process

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 system ensures safe and continuous removal of hydrogen at low concentrations, preventing ignition and pressure buildup, and reducing environmental impact by converting hydrogen to water.

Implementation Method 1

a hydrogen oxidation reaction catalyzed by said metal-based catalyst

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

hydrogen oxidation reaction catalyzed by said metal-based catalyst

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentEP4647162A1Off-shore catalysts for a ventilated cable box

Publication Date: 2025.11.12 GANEMI BAGER

Figure 1A~2
Figure 3A~3B
Figure 3C~4

AI summary

The present disclosure relates to use of a metal-based catalyst supported on a solid substrate, such as platinum supported on a ceramic monolith, for controlling a level of gaseous hydrogen in or in connection to a ventilated cable junction box, wherein said gaseous hydrogen is removed by a hydrogen oxidation reaction catalyzed by said metal-based catalyst. The present disclosure also relates to a method and a system for controlling the level of gaseous hydrogen in or in connection to a ventilated cable junction box.