Gas Separation System with Membrane Splitter and CO2 Removal
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Solution Overview
Problem
Existing gas separation systems for controlling CO2 and O2 concentrations in breathing air face challenges in independently managing gas species, leading to undesirable side effects such as stress or relaxation due to imbalanced gas concentrations, and require significant maintenance and consumables.
Innovation Solution
A gas separation system comprising a splitter unit with a membrane system, a transfer unit, and directional control valves that allow for precise control of gas species concentrations by varying pressure differences and flow rates, using the same membrane material for both units to reduce complexity and maintainability, and incorporating a humidifier and water reducer to manage water vapor and enhance system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a membrane system is used to enrich oxygen concentration in breathing air, then oxygen content is increased and breathing is relaxed, but carbon dioxide concentration is also enriched which stresses the human
Solution Approach 1:
The gas separation process is divided into two independent stages: first the membrane system enriches oxygen in the permeate, then a separate CO2 removal system eliminates carbon dioxide from the permeate. This segmentation allows independent control of oxygen enrichment and CO2 removal, resolving the contradiction where oxygen enrichment previously caused harmful CO2 accumulation.
2Measurement precision
If traditional gas separation systems are used to control gas species concentrations, then gas separation is achieved, but maintenance requirements and consumable usage increase significantly
Solution Approach 1:
The system uses a humidifier to add moisture to the permeate gas, which then serves a dual function: it prevents membrane drying and degradation (maintaining system performance) while also preparing the gas for efficient CO2 absorption in the subsequent removal stage. This self-service approach reduces maintenance requirements and extends membrane life.
3Adaptability or versatility
If conventional breathing air systems are used, then basic oxygen supply is provided, but the ability to independently control CO2 and O2 concentrations is limited
Solution Approach 1:
The permeate serves as an intermediary stream that carries oxygen-enriched air from the membrane system to the CO2 removal system. This intermediary approach allows the two separation processes to work independently yet cooperatively, enabling precise control of both O2 and CO2 concentrations without requiring a single complex separation system.
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 system effectively controls CO2 and O2 concentrations independently, providing both oxygen-enriched and depleted breathing air while minimizing maintenance and consumables, and optimizing resource use by reusing outputs, thus offering a more economical and efficient solution.
Implementation Method 1
the process of permeation involves the diffusion of molecules, called the permeate, through a membrane or interface
Implementation Method 2
Permeation works through diffusion; the permeate will move from high concentration to low concentration across the membrane
Implementation Method 3
the driving force for a gas to permeate through a membrane is the partial pressure difference; in other words, the partial gradient between the inside of the retentate side and the outside of the permeate side
Data Source
AI summary
A gas separation system for controlling a concentration of a first gas species and a second gas species in an outlet gas comprises a splitter unit. The splitter unit comprises a gas membrane system having a gas inlet port. The gas inlet port is in fluid connection with an air intake. A membrane is a selective barrier and allows some things to pass through but stops others.