Fuel Cell Cylinder Head Hydrogen Venting Design

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Solution Overview

Problem

Fuel cells operating in open mode with hydrogen recirculation face safety challenges due to the risk of hydrogen leaks, as existing systems do not adequately address the ventilation and recirculation of hydrogen, potentially leading to hazardous mixtures of air and hydrogen.

Innovation Solution

A fluidic distribution yoke with a central chamber and ventilation openings that allow fluidic communication between the central chamber and the external environment, incorporating an ejector connected to the hydrogen inlet fluidic chamber and a hydrogen recirculation line connected to the hydrogen outlet fluidic chamber, enhancing natural convection and reducing the risk of hydrogen accumulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If hydrogen recirculation is implemented in open mode, then fuel efficiency is improved by reinjecting unconsumed hydrogen, but safety deteriorates due to the risk of hydrogen leaks and formation of flammable mixtures

Engineering Contradiction:

Improvefuel efficiencyVSAvoidsafety risk from hydrogen leaks

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The harmful element (unconsumed hydrogen) is extracted from the recirculation loop and vented to the external environment through the phase separator, eliminating the safety risk while maintaining fuel efficiency benefits

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

A phase separator is introduced as an intermediary component between the recirculation loop and the environment, separating hydrogen from water vapor and safely venting only the hydrogen to prevent flammable mixture formation

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If a recirculation loop is added to the fluid distribution system, then fuel efficiency is improved, but device complexity increases

Engineering Contradiction:

Improvefuel efficiencyVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The phase separator and venting system are merged into the existing fluid distribution yoke structure, integrating the safety function without adding separate complex subsystems

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The fluid distribution yoke is designed to serve multiple functions: fluid distribution, hydrogen recirculation, and safety venting, reducing the need for separate dedicated components

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 design improves safety by ensuring continuous air renewal within the central chamber, reducing the risk of forming flammable or explosive air-hydrogen mixtures and maintaining a high level of safety while allowing for efficient hydrogen recirculation and distribution within the fuel cell system.

Implementation Method 1

The invention also relates to a fuel cell, intended to operate in open mode with hydrogen recirculation... The design improves safety by ensuring continuous air renewal within the central chamber

Methodology Applied

Scientific EffectNatural convection: Free Convection

Data Source

PatentEP3761425B1Cylinder head for fluid distribution of a fuel cell

Publication Date: 2021.11.10 COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

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Figure 2A
Figure 2B

AI summary

The invention relates to a fluidic distribution cylinder head comprising fluidic chambers (24, 26, 28), a central chamber (30) surrounded by the fluidic chambers, an ejector (3) located in the central chamber, and a hydrogen recirculation fluidic line (4), the central chamber (30) comprising at least two ventilation openings (31) allowing fluidic communication, in the principal plane, between the central chamber (30) and the external environment of the cylinder head (20).