Catalyst Ring Anode Tail Gas Oxidizer for Compact Fuel Cell Humidification

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Solution Overview

Problem

Conventional fuel cell systems require large and bulky steam generators for humidification, which increase system size, complexity, and manufacturing costs, and necessitate long corrugated tubing for water vaporization, leading to inefficient system response times.

Innovation Solution

A water injector is used to directly inject water into the anode exhaust recycle stream, vaporizing it into steam or aerosol form, which is then reintroduced into the fuel inlet stream, eliminating the need for a steam generator and allowing for shorter, non-corrugated conduits, thus reducing system size and complexity while improving response times.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a steam generator is used for humidification, then the fuel inlet stream can be properly humidified, but the system size, complexity, and manufacturing costs increase

Engineering Contradiction:

Improvehumidification capabilityVSAvoidsystem size and complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent extracts the steam generation function from the separate steam generator and relocates it directly into the anode exhaust recycle stream. This is achieved by injecting water directly into the hot anode exhaust stream where it naturally vaporizes, eliminating the need for a dedicated steam generator component and its associated corrugated tubing.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the humidification function with the existing anode exhaust recycle stream. The water injection system combines the steam generation process with the exhaust gas recirculation process, allowing both functions to occur in the same location and using the same thermal energy source.

Inventive Principle:

Principle #5Merging (Combining)

2Ease of operation

If a steam generator with corrugated tubing is used, then water vaporization can occur, but the system response time becomes inefficient

Engineering Contradiction:

Improvewater vaporization capabilityVSAvoidsystem response time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The patent replaces the mechanical steam generation system (steam generator with heating elements and corrugated tubing) with a direct injection system. Water is injected directly into the hot exhaust stream where thermal energy from the exhaust gases rapidly vaporizes the water, eliminating the need for complex mechanical heating components and reducing response time.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If a steam generator is used for humidification, then the fuel inlet stream can be humidified, but manufacturing costs increase

Engineering Contradiction:

Improvehumidification capabilityVSAvoidmanufacturing costs

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs a simpler, more cost-effective water injection system instead of an expensive steam generator. The injection system uses basic components that can be easily manufactured and installed, reducing overall system manufacturing costs while maintaining effective humidification functionality.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 approach reduces system size, complexity, and cost by eliminating the steam generator and enhancing system responsiveness through direct steam generation in the anode exhaust recycle stream.

Implementation Method 1

A water injector is used to directly inject water into the anode exhaust recycle stream, vaporizing it into steam or aerosol form

Methodology Applied

Scientific EffectVaporization: Evaporation

Implementation Method 2

a first catalyst ring disposed in a chamber formed between the inner ATO wall and the outer ATO wall, the first catalyst ring comprising: an inner wall; an outer wall; and a matrix disposed between the inner wall and the outer wall and loaded with an oxidation catalyst

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentUS12388100B2Fuel cell system including catalyst ring anode tail gas oxidizer

Publication Date: 2025.08.12 BLOOM ENERGY CORP

AI summary

A fuel cell system anode tail gas oxidizer (ATO) includes an inner ATO wall, an outer ATO wall, and a first catalyst ring disposed in a chamber formed between the inner ATO wall and the outer ATO wall. The first catalyst ring includes an inner wall, an outer wall, and a matrix disposed between the inner wall and the outer wall and loaded with an oxidation catalyst.