Redox Battery Venting Oxygen Scavenging
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Solution Overview
Problem
Vanadium redox battery energy storage systems face safety hazards due to the potential for explosive gas mixtures of oxygen and hydrogen, which are generated simultaneously and can mix in the vent spaces, necessitating a design that allows safe mixing while preventing explosive conditions.
Innovation Solution
Implementing a venting system that uses the negative electrolyte as an oxygen scavenger to maintain low oxygen levels, ensuring the gas mixture is not explosive by removing sufficient oxygen from the positive vent gas and maintaining it under a low positive pressure, utilizing mechanisms like siphons and eductors to separate and absorb oxygen, thereby preventing hydrogen accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen and hydrogen are vented separately to prevent explosive mixtures, then safety is improved, but device complexity increases
Solution Approach 1:
The patent combines the venting of oxygen and hydrogen into a single common vent space, eliminating the need for separate venting systems. This merging approach maintains safety by using the negative electrolyte as an oxygen scavenger that chemically removes oxygen from the vented gas mixture, preventing explosive conditions while simplifying the overall system design
Solution Approach 2:
The negative electrolyte acts as an intermediary substance that mediates between the vented oxygen and hydrogen gases. It chemically reacts with and scavenges oxygen from the positive vent gas before the gases mix in the common vent space, thereby preventing explosive mixture formation without requiring complex mechanical separation systems
2Device complexity
If a common vent space is used for both positive and negative electrolytes, then device complexity is reduced, but the risk of explosive gas mixtures increases
Solution Approach 1:
The negative electrolyte serves as a chemical intermediary that selectively reacts with oxygen in the vented gas stream. By introducing this intermediary substance into the common vent space, the system allows simplified gas venting while simultaneously eliminating the harmful explosive risk through chemical oxygen removal
Solution Approach 2:
The patent converts the potentially harmful presence of oxygen in the vented gas into a beneficial chemical reaction. The oxygen that would otherwise create explosive conditions is transformed into a useful oxygen-scavenging reaction with the negative electrolyte, turning a safety hazard into a safety mechanism
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 prevents explosive gas mixtures by ensuring oxygen levels are below hazardous concentrations, allowing safe operation by ensuring the gas mixture is not within explosive limits and allowing hydrogen to flow outward, thus preventing potential explosions.
Implementation Method 1
uses the negative electrolyte as an oxygen scavenger to maintain low oxygen levels
Implementation Method 2
vanadium redox battery energy storage systems
Implementation Method 3
utilizing mechanisms like siphons and eductors to separate and absorb oxygen
Implementation Method 4
utilizing mechanisms like siphons and eductors to separate and absorb oxygen
Implementation Method 5
maintaining it under a low positive pressure, utilizing mechanisms like siphons and eductors to separate and absorb oxygen, thereby preventing hydrogen accumulation
Data Source
AI summary
An improved redox battery energy storage system is disclosed for reducing oxygen gas levels and separating oxygen gas from hydrogen gas, thus reducing the likelihood of flammable gas explosions. The system includes at least one cell, which includes a positive compartment having positive solution, a negative compartment having negative solution, and a membrane separating the positive and negative compartments. A positive reservoir is in fluid communication with the cell's positive compartment, the positive reservoir defining a positive vent space for positive gas, which includes oxygen. A negative reservoir is in fluid communication with the cell's negative compartment, the negative reservoir defining a negative vent space. A return line is in fluid communication with the negative compartment and the negative reservoir to return the negative solution from the cell to the negative reservoir through the negative vent space. A positive gas draw line is in fluid communication with the positive vent space and coupled to the return line at a connection, causing positive gas to be siphoned from the positive vent space into the negative vent space, where the negative solution of the negative reservoir scavenges the oxygen. A balancing line is in fluid communication with the positive and the negative vent spaces to recirculate oxygen-depleted positive gas to the positive vent space.