Salt Cavern Hydrogen Storage With In-Service Expansion
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Solution Overview
Problem
Existing hydrogen storage facilities in salt caverns are geographically and geologically limited, inflexible, and require lengthy solution mining processes, making them unsuitable for rapidly evolving market dynamics and expanding national hydrogen ecosystems.
Innovation Solution
A method for expanding salt caverns through solution mining while maintaining a hydrogen blanket during the process, allowing for flexible hydrogen storage capacity expansion and utilizing the natural impermeability of the salt formation to retain hydrogen, rather than relying on pressure barriers, and enabling caverns to be placed into service before completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solution mining is completed before placing the cavern into hydrogen storage service, then the cavern structure is stable and impermeable, but the development process becomes lengthy and inflexible
Solution Approach 1:
The patent applies preliminary action by conducting solution mining to create the cavern void space before introducing hydrogen for storage. This preliminary cavern formation establishes the structural framework and allows for subsequent hydrogen injection once the cavern is ready, rather than waiting for complete mining operations
Solution Approach 2:
The patent implements dynamics by allowing the cavern to be placed into hydrogen storage service before solution mining is fully complete, and then continuing to expand the cavern volume through additional solution mining while maintaining hydrogen storage operations. This dynamic approach allows simultaneous cavern development and hydrogen storage
2Reliability
If pressure barriers are used to retain hydrogen in the cavern, then hydrogen containment is achieved, but the system becomes geographically and geologically limited
Solution Approach 1:
The patent applies self-service by utilizing the natural impermeability of the salt formation itself to contain hydrogen, rather than requiring engineered pressure barriers. The salt dome formation naturally provides the containment function, eliminating the need for complex pressure management systems and enabling deployment in diverse geological locations
3Quantity of substance
If the cavern is expanded through continued solution mining after hydrogen storage begins, then storage capacity increases, but the operational complexity increases
Solution Approach 1:
The patent merges the cavern expansion operation with the hydrogen storage operation by continuing solution mining activities while simultaneously maintaining hydrogen storage. The solvent injection system and brine removal system are maintained and used for both cavern expansion and hydrogen containment purposes
Solution Approach 2:
The patent implements multi-functionality by using the same wellbores, piping systems, and operational infrastructure for both solution mining (cavern expansion) and hydrogen storage operations, rather than requiring separate systems for each function
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
Facilitates faster, more flexible, and broader geographical deployment of hydrogen storage facilities, supporting dynamic market growth without compromising safety or structural integrity, aligning with national clean hydrogen strategies.
Implementation Method 1
Solution mining involves injecting water through pipes underground into a naturally occurring geologic formation of salt. The water dissolves the salt, thereby creating brine.
Implementation Method 2
Gulf Coast salt domes have high halite concentrations with low structural permeability to gases, making them uniquely suitable for underground salt cavern storage of gases.
Data Source
AI summary
Methods and systems for storing hydrogen in a salt cavern are provided. Particularly, the storage processes involve: placing the storage facility into service and subsequently creating additional cavern capacity; using hydrogen as a protective blanket during solution mining; using a predetermined cylindrical region within the salt formation as a sufficiently impermeable barrier; and maintaining cavern integrity by maintaining a predetermined quantity of hydrogen within the predetermined cylindrical region.