Salt Cavern Gas Storage Impurity Control via Segmentation
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Solution Overview
Problem
In solution mined salt caverns, gases and liquids become contaminated by impurities such as hydrogen sulfide, methane, and carbon dioxide, which accumulate over time, causing the stored products to fail commercial specifications in single cavern storage configurations.
Innovation Solution
Implementing an inventory management method that involves introducing and removing gas products from multiple salt caverns, analyzing impurities, predicting maximum acceptable impurity limits, and strategically replacing the working gas to maintain product quality, utilizing a pipeline and pump or compressor system to connect caverns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single salt cavern is used for gas storage, then the storage capacity is sufficient, but impurities accumulate over time causing the product to fail commercial specifications
Solution Approach 1:
The single cavern storage system is segmented into multiple caverns (first salt cavern and second salt cavern) that operate in parallel. Each cavern can be independently managed, allowing the system to maintain storage capacity while preventing impurity accumulation through sequential or alternating use of different caverns.
2Reliability
If multiple salt caverns are used for gas storage, then impurity accumulation is prevented, but the system complexity increases
Solution Approach 1:
Multiple caverns are merged into a unified storage system with common surface facilities including pipeline connections, pump/compressor stations, and control systems. This allows the system to benefit from multiple caverns for quality maintenance while consolidating operational complexity at the surface level rather than requiring separate infrastructure for each cavern.
Solution Approach 2:
The system implements periodic action by alternately using different caverns for storage operations. When one cavern reaches impurity limits, operations can shift to another cavern, allowing the first to be depleted and refilled. This periodic rotation maintains product quality while simplifying management compared to continuous monitoring and treatment of a single cavern.
3Productivity
If gas product is continuously stored in salt caverns, then supply availability is maintained, but impurity levels increase over time
Solution Approach 1:
The system implements discarding and recovering by depleting caverns of working gas when impurity levels reach maximum acceptable limits, then refilling them with fresh gas. Multiple caverns allow this cycle to occur sequentially rather than requiring simultaneous shutdown of all storage facilities, thus maintaining supply availability while removing impurity-affected gas.
Solution Approach 2:
The harmful impurities are extracted from the system by depleting the cavern of working gas before impurities reach unacceptable levels. The depleted cavern is then refilled with clean gas, effectively taking out the impurity-laden gas from the storage system and replacing it with fresh product.
Data Source
AI summary
An inventory management method is also provided. This method includes removing and replacing the gas product from a first salt cavern as supply and demand dictate, analyzing the impurities in the gas product that is removed, predicting the duration until a maximum acceptable impurity limit is present, removing all the working gas from the first salt cavern when the maximum acceptable impurity limit is reached, then replacing the working gas in the first salt cavern, while concurrently, removing and replacing the gas product from a second salt cavern as supply and demand dictate, analyzing the impurities in the gas product that is removed, predicting the duration until a maximum acceptable impurity limit is present, removing all the working gas from the second salt cavern when the maximum acceptable impurity limit is reached, then replacing the working gas in the second salt cavern, while concurrently repeating steps a)-g).