Salt Cavern Hydrogen Storage Using Chemical Carrier Fluids

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Solution Overview

Problem

Storing hydrogen in salt caverns is challenging due to hydrogen's low volumetric density, diffusion through salt walls leading to leakage, embrittlement of cavern structures, and safety risks from flammability, necessitating improved storage methods.

Innovation Solution

Utilizing chemical hydrogen carriers like methyl formate, methanol, methylcyclohexane, formic acid, and ammonium formate, which are pumped into salt caverns with a cushion gas, offering higher energy density and minimal reactivity with salt surfaces, enhancing safety and storage capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If hydrogen gas is stored in salt caverns, then storage capacity is achieved, but diffusion through salt walls causes leakage

Engineering Contradiction:

Improvehydrogen storage capacityVSAvoidstorage integrity

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent introduces chemical hydrogen carriers (methyl formate, methanol, formic acid, ammonium formate) as intermediary substances to store hydrogen in salt caverns. These carriers do not diffuse through salt walls like molecular hydrogen, thereby preventing leakage while maintaining storage capacity. The carriers act as mediators between the storage infrastructure and hydrogen energy.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If hydrogen gas is stored in salt caverns, then energy storage is achieved, but embrittlement of cavern structures occurs

Engineering Contradiction:

Improveenergy storage capacityVSAvoidcavern structural integrity

Core Design Contradiction:

Quantity of substanceVSStrength

Solution Approach 1:

Chemical hydrogen carriers serve as intermediary substances that eliminate direct contact between hydrogen and cavern structures. This prevents hydrogen embrittlement of metal components while maintaining energy storage capacity, as the carriers are chemically stable and do not cause embrittlement.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Quantity of substance

If hydrogen gas is stored in salt caverns, then storage volume is achieved, but flammability and safety risks increase

Engineering Contradiction:

Improvestorage volumeVSAvoidflammability risk

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent creates an inert storage environment by using chemical hydrogen carriers instead of gaseous hydrogen. These carriers are non-flammable liquid compounds that maintain hydrogen energy density while eliminating fire and explosion hazards associated with storing large volumes of hydrogen gas in confined salt caverns.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

4Ease of operation

If hydrogen gas is stored at surface facilities, then accessibility is maintained, but storage capacity is insufficient

Engineering Contradiction:

ImproveaccessibilityVSAvoidstorage capacity

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The patent changes the physical state and chemical form of hydrogen from low-density gas to high-density liquid chemical carriers. This parameter change enables subsurface storage in salt caverns while maintaining energy density, effectively increasing storage capacity by several orders of magnitude compared to surface gaseous storage.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250388405A1Methods of storing hydrogen in salt caverns using fluid derivatives

Publication Date: 2025.12.25 SAUDI ARABIAN OIL CO

AI summary

Methods for storing hydrogen in subterranean salt caverns using chemical hydrogen carriers.