Salt Cavern Hydrogen Storage Permeation Barrier
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Solution Overview
Problem
High purity hydrogen storage in salt caverns is challenging due to hydrogen's small atomic radius and flammability, leading to potential leakage and safety hazards if not properly contained, especially when maintaining high purity levels above 99.99%.
Innovation Solution
Maintaining the cavern pressure within a specific range (above 0.2 psi/foot to below 1 psi/foot) forms a permeation barrier by reducing the porosity of the salt cavern walls, preventing hydrogen leakage and creating a leak-tight environment for storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high purity hydrogen is stored in salt caverns, then storage capacity and availability are improved, but hydrogen leakage through the salt formation increases due to hydrogen's small atomic radius and high permeability
Solution Approach 1:
A brine barrier is introduced as an intermediary substance between the stored hydrogen and the salt formation. The brine fills the pore spaces in the salt, creating a liquid barrier that prevents hydrogen molecules from permeating through the salt matrix. This mediator effectively blocks the leakage pathway while allowing the salt cavern to maintain its large storage capacity.
Solution Approach 2:
The invention changes the physical-chemical parameters of the storage environment by introducing brine with specific density and compositional characteristics. The brine's density is maintained within a specific range (0.95-1.05 g/cm³) to ensure it remains in the liquid phase and effectively blocks hydrogen permeation. This parameter control transforms the permeable salt formation into an impermeable storage medium.
2Strength
If salt caverns with minimum 75% halite purity are used for storage, then structural integrity is improved, but hydrogen permeation increases due to the inherent porosity of salt formations
Solution Approach 1:
The brine acts as a mediator that fills the inherent porosity of the salt formation without compromising its structural integrity. The liquid brine occupies the pore spaces that would otherwise allow hydrogen diffusion, while the salt matrix itself maintains its mechanical strength and load-bearing capacity.
Solution Approach 2:
The invention utilizes the porous structure of the salt formation but transforms its function. Instead of relying on the dense, non-porous structure to block hydrogen (which would compromise structural integrity), the porosity is filled with brine to create a permeation barrier, effectively decoupling the structural function from the barrier function.
3Quantity of substance
If large quantities of hydrogen (greater than 100 million standard cubic feet) are stored, then storage facility effectiveness is improved, but the risk of dangerous situations from hydrogen escape increases
Solution Approach 1:
The brine barrier serves as a safety intermediary that prevents hydrogen escape even when large quantities are stored. By filling the pore spaces with liquid brine, the system creates a physical barrier that eliminates the permeation pathway, thereby removing the safety hazard associated with large-scale hydrogen storage in salt caverns.
Solution Approach 2:
The invention converts the potentially harmful effect of salt formation porosity (which causes hydrogen leakage) into a beneficial feature. The same porous structure that could allow leakage is utilized to hold the brine barrier, transforming the weakness into a strength for preventing hydrogen escape.
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
The solution effectively stores high purity hydrogen without detectable seepage, ensuring safety and structural integrity by forming a permeation barrier that confines hydrogen molecules within the cavern, even at high purity levels up to 99.999%, while preventing fractures and leakage.
Implementation Method 1
maintaining the cavern pressure within a specific pressure range improves the structural integrity of the salt cavern... the salt cavern forms a substantially impermeable barrier to the stored hydrogen therein between the lower limit and the upper limit
Implementation Method 2
maintaining the cavern pressure within a specific range (above 0.2 psi/foot to below 1 psi/foot) forms a permeation barrier by reducing the porosity of the salt cavern walls
Data Source
AI summary
A novel method and system for storing high purity hydrogen into a salt cavern is provided. Particularly, the storage process involves storing high purity hydrogen into a salt cavern without seepage or leakage of the stored hydrogen through the salt cavern walls, by creating a permeation barrier along the salt cavern walls. The cavern pressure is monitored and controlled to ensure formation and maintenance of the permeation barrier. Optional temperature treatments may also be incorporated as desired.