Solid Oxide Electrolyzer Air Bypass Splitter

Solution Overview

Problem

Existing hydrogen generation systems using solid oxide electrolyzer cells (SOECs) face inefficiencies due to the need for precise control of air flow, which can lead to increased power consumption and reduced system efficiency.

Innovation Solution

The implementation of an air bypass system that splits the air inlet stream into a bypass air stream and a second air inlet stream, allowing the bypass air stream to bypass the stack of electrolyzer cells, thereby controlling air flow and reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If air flow through the stack is increased to cool the product stream, then cooling effect is improved, but power consumption increases

Engineering Contradiction:

Improveproduct stream temperatureVSAvoidpower consumption

Core Design Contradiction:

TemperatureVSUse of energy by moving object

Solution Approach 1:

The air inlet stream is divided into two separate streams: a first air inlet stream that bypasses the stack entirely for cooling purposes, and a second air inlet stream that flows through the stack for oxygen removal. This segmentation allows the cooling function to be decoupled from the oxygen removal function, enabling independent optimization of each process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first air inlet stream serves a dual purpose: it provides cooling to the product stream and simultaneously serves as the bypass stream that avoids heating requirements. This multi-functionality reduces the overall energy demand compared to using a single air stream for both cooling and oxygen removal.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Quantity of substance

If air flow through the air heater is increased to provide sufficient oxygen to the stack, then oxygen supply is improved, but power consumption increases

Engineering Contradiction:

Improveoxygen supply to stackVSAvoidair heater power consumption

Core Design Contradiction:

Quantity of substanceVSUse of energy by moving object

Solution Approach 1:

The air inlet stream is divided into two separate streams: a first air inlet stream that bypasses the stack entirely for cooling purposes, and a second air inlet stream that flows through the stack for oxygen removal. This segmentation allows the cooling function to be decoupled from the oxygen removal function, enabling independent optimization of each process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system changes the flow rate parameter of the air streams to optimize performance. The first air inlet stream is maintained at a higher flow rate to provide adequate cooling, while the second air inlet stream is optimized for sufficient oxygen supply without excessive heating requirements.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If single air inlet stream is used for both cooling and oxygen removal, then system complexity is reduced, but system efficiency decreases

Engineering Contradiction:

Improveair flow control systemVSAvoidhydrogen generation efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The air inlet stream is divided into two separate streams: a first air inlet stream that bypasses the stack entirely for cooling purposes, and a second air inlet stream that flows through the stack for oxygen removal. This segmentation allows the cooling function to be decoupled from the oxygen removal function, enabling independent optimization of each process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system incorporates controllable components (such as valves or flow controllers) that allow dynamic adjustment of the split ratio between the first and second air inlet streams. This enables the system to adapt to varying operating conditions and optimize efficiency while maintaining adequate cooling and oxygen supply.

Inventive Principle:

Principle #15Dynamics

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 enhances the efficiency of the hydrogen generation system by reducing air flow through the air heater and stack, leading to lower power consumption and improved overall system efficiency.

Implementation Method 1

oxygen ions are transported from the fuel (e.g., steam) side to the air side

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 2

a product cooler heat exchanger configured to cool the product stream using the first air inlet stream

Methodology Applied

Scientific EffectHeat transfer: Heat Exchanger

Implementation Method 3

water (e.g., steam) is provided to the fuel electrode and is reduced (H2O+2e→O2−+H2) to form H2 gas and O2− ions

Methodology Applied

Scientific EffectElectrolysis: Electrolysis

Implementation Method 4

the O2− ions are transported through the solid electrolyte, and then oxidized (e.g., by an air inlet stream) on the air side (O2−to O2) to produce molecular oxygen

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentUS20250198014A1Solid oxide elecrolyzer system including air bypass

Publication Date: 2025.06.19 BLOOM ENERGY CORP

AI summary

An electrolyzer system includes a splitter configured to split a first air inlet stream into a bypass air stream and a second air inlet stream, a stack of electrolyzer cells configured receive steam and the second air inlet stream and output a product stream containing hydrogen and an oxygen exhaust stream, such that the bypass air stream is configured to bypass the stack, and a product cooler heat exchanger configured to cool the product stream using the first air inlet stream.