Selective Gas Trapping via Membrane Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing devices for trapping flammable gases like hydrogen in containment enclosures with radioactive materials face challenges due to gas poisoning by compounds like carbon monoxide, which reduces their effectiveness, and require continuous operation to prevent accumulation, especially in environments with unpredictable hydrogen production.
Innovation Solution
A containment enclosure with a selective filter that allows flammable gases to pass while blocking poisonous gases, using a combination of a microporous layer and a metal membrane to create a partial pressure gradient for hydrogen trapping, and allowing easy replacement of active means when saturated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If active means are placed directly in the containment enclosure to trap flammable gases, then hydrogen trapping efficiency is improved, but the active means are poisoned by carbon monoxide and other poisonous gases reducing effectiveness
Solution Approach 1:
The system is segmented into two distinct zones: a first zone containing the active means for hydrogen trapping, and a second zone containing the gas mixture source. This spatial segmentation prevents direct contact between the active means and poisonous gases while maintaining hydrogen transfer capability through the separating membrane.
Solution Approach 2:
A selective membrane acts as an intermediary between the gas mixture and the active means. This membrane selectively permits hydrogen passage while blocking carbon monoxide and other poisonous gases, thereby protecting the active means from poisoning while maintaining hydrogen trapping functionality.
2Reliability
If filters are used to block poisonous gases, then active means are protected from poisoning, but large quantities of active product are necessary due to difficulty in optimizing distribution
Solution Approach 1:
A selective membrane with specific porosity and molecular sieve properties is employed. This porous material inherently blocks poisonous gases like carbon monoxide while permitting hydrogen passage, eliminating the need for large quantities of active product and optimizing the distribution of trapping capacity throughout the system.
3Productivity
If oxidation recombiners are used to trap hydrogen, then hydrogen recombination into water is achieved, but sufficient oxygen must be present in the gas overhead which is not always true
Solution Approach 1:
The system changes the operational parameter from requiring oxygen presence to operating under varying oxygen conditions. By using a membrane-based selective trapping mechanism instead of oxidation recombination, the system adapts to environments with unpredictable oxygen availability while maintaining hydrogen trapping effectiveness.
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
Effectively traps hydrogen while preventing poisoning gases from interfering with the active means, ensuring continuous operation and efficient gas capture even in environments with variable hydrogen production.
Implementation Method 1
a selective filter that allows flammable gases to pass while blocking poisonous gases
Implementation Method 2
using a combination of a microporous layer and a metal membrane to create a partial pressure gradient for hydrogen trapping
Implementation Method 3
create a partial pressure gradient for hydrogen trapping
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
A device for trapping flammable gases such as hydrogen comprises active means (3) inside a casing (1) which is closed except for openings which are plugged by filters (2) that normally allow only the gases that are to be trapped to pass through them. The trapping maintains a reduced pressure inside the casing, which continually draws in the gases produced outside. The trap can operate without any maintenance and for long periods of time, even in a completely enclosed environment.