Liquid Fuel Production Using Solid Oxide Electrolyzer Steam Integration

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Solution Overview

Problem

Existing technologies do not effectively integrate solid oxide electrolyzers with liquid fuel production processes to enhance efficiency and reduce carbon dioxide emissions in heavy transport and aviation sectors.

Innovation Solution

Thermally integrate a solid oxide electrolyzer with a liquid fuel production process by using steam produced from the Fischer-Tropsch reaction as feed to the electrolyzer, improving the electrolysis system efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If liquid water is used as feed to the solid oxide electrolyzer, then the electrolysis process can proceed, but the heat of vaporization must be supplied by the electrolyzer itself, reducing overall efficiency

Engineering Contradiction:

Improveelectrolysis system efficiencyVSAvoidelectrical energy demand

Core Design Contradiction:

Loss of energyVSUse of energy by stationary object

Solution Approach 1:

The patent merges the steam generation function from the Fischer-Tropsch liquid fuel production process with the solid oxide electrolyzer feed requirement. The steam produced as a byproduct of the exothermic Fischer-Tropsch reaction is directly utilized as feedstock for the electrolyzer, eliminating the need for separate steam generation and reducing electrical energy demand by 10.2%.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent converts the waste heat and steam produced by the Fischer-Tropsch reaction into a beneficial resource for the electrolyzer. The exothermic heat that would otherwise be a byproduct is now utilized to generate the steam feed required for efficient electrolysis, transforming a waste stream into a valuable input.

Inventive Principle:

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

2Loss of substance

If steam is produced from the Fischer-Tropsch reaction and used as feed to the electrolyzer, then water consumption is reduced, but the processes must be thermally integrated

Engineering Contradiction:

Improvewater consumptionVSAvoidprocess integration complexity

Core Design Contradiction:

Loss of substanceVSDevice complexity

Solution Approach 1:

The patent combines two separate processes (Fischer-Tropsch liquid fuel production and solid oxide electrolysis) into an integrated system where the steam output of one process becomes the input of the other. This merging eliminates the need for external water consumption for steam generation and reduces overall system complexity despite the thermal integration requirements.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated system serves itself by using the steam produced internally from the Fischer-Tropsch reaction to feed the electrolyzer, eliminating the need for external water supplies and steam generation facilities. The system essentially provides its own steam feedstock through internal process integration.

Inventive Principle:

Principle #25Self-service

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

Reduces the electrical energy demand by 10.2% and significantly decreases water consumption, enhancing the overall process efficiency and reducing carbon dioxide emissions.

Implementation Method 1

In the SOEC, water is split into hydrogen and oxygen ions at the cathode. The oxygen ions diffuse across a ceramic membrane, and oxygen is produced at the anode by combination of oxygen ions using heat and electrochemical gradients as driving force.

Methodology Applied

Scientific EffectElectrolysis: Electrolysis

Implementation Method 2

Fischer-Tropsch is an exothermic reaction that can be used to produce steam.

Methodology Applied

Scientific EffectExothermic reaction: Exothermic Reaction

Implementation Method 3

The steam produced from the Liquid Fuel Production (LFP) reactor system, where the Fischer-Tropsch reaction occurs, is used as feed to the Solid Oxide Electrolysis Cell. The higher temperature steam improves the efficiency of the overall electrolysis system. The steam improves the efficiency of the electrolysis because the heat of vaporization for the liquid water does not have to be supplied by the electrolyzer.

Methodology Applied

Scientific EffectThermal energy transfer: Conduction (thermal)

Data Source

PatentUS20250215331A1Thermally integrated process for the production of liquid fuels with a solid oxide electrolyzer

Publication Date: 2025.07.03 INFINIUM TECHNOLOGY LLC

AI summary

Production of fuels from low carbon electricity and from carbon dioxide by the use of a solid oxide electrolysis cell (SOEC) and Fischer-Tropsch is shown. Fischer-Tropsch is an exothermic reaction that can be used to produce steam. Steam produced from the Liquid Fuel Production (LFP) reactor system, where the Fischer-Tropsch reaction occurs, is used as feed to the SOEC. The higher temperature steam improves the efficiency of the overall electrolysis system. The integration of the LFP steam improves the efficiency of the electrolysis because the heat of vaporization for the liquid water does not have to be supplied by the electrolyzer.