Gas-Liquid Separator with Porous Membrane for Hydrogen Purity
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Solution Overview
Problem
Existing gas-liquid separators in fuel cell systems recirculate undesirable components like nitrogen along with hydrogen, reducing fuel cell efficiency and requiring additional components like discharge valves, which increase costs and reduce hydrogen availability for energy generation.
Innovation Solution
A gas-liquid separator that uses the centrifugal principle to separate water and nitrogen from hydrogen, eliminating the need for additional components like discharge valves by utilizing a container design with a nozzle tip, curved region, and semi-permeable membranes to enhance separation efficiency and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gas-liquid separator is used to separate water from exhaust gas, then water separation is achieved, but gaseous nitrogen and other heavy components are also conveyed back into the fuel cell along with hydrogen, reducing fuel cell efficiency
Solution Approach 1:
The patent employs a porous separating wall made of sintered metal or ceramic material with specific pore sizes (0.1-10 micrometers) that allows hydrogen molecules to pass through while blocking larger nitrogen molecules and liquid water droplets. This selective permeability based on pore size enables the separation of desired hydrogen from harmful heavy components without requiring additional discharge valves.
Solution Approach 2:
The separator housing is divided into distinct functional zones: an inlet region for exhaust gas entry, a separation region with the porous wall, a stabilization chamber for hydrogen collection, and an outlet region for purified hydrogen discharge. This segmentation allows each zone to perform its specific function optimally, ensuring efficient separation and preventing mixing of separated components.
2Object-generated harmful factors
If an additional discharge valve is added to remove gaseous nitrogen, then nitrogen discharge capability is improved, but hydrogen is also separated during nitrogen discharge and additional component complexity increases
Solution Approach 1:
The porous separating wall performs multiple functions simultaneously: it separates liquid water from gas, filters gaseous nitrogen from hydrogen, and allows selective passage of hydrogen molecules. This multi-functionality eliminates the need for separate discharge valves for nitrogen and water, reducing component complexity while maintaining effective separation of all harmful components.
Solution Approach 2:
The patent combines the functions of water separation, nitrogen filtration, and hydrogen purification into a single integrated separator unit with one porous wall structure. This merging of multiple separation functions into one component simplifies the overall system design and eliminates the need for multiple separate valves and control mechanisms.
3Reliability
If separation components are added to remove undesirable components, then separation efficiency is improved, but energy consumption and system costs increase
Solution Approach 1:
The separator utilizes the natural kinetic energy and pressure differential of the flowing exhaust gas to drive the separation process through the porous wall. Hydrogen molecules pass through the porous wall into the stabilization chamber driven by the gas flow itself, without requiring external power sources or additional energy input beyond the normal fuel cell operation.
Solution Approach 2:
The patent replaces complex mechanical separation systems (such as centrifugal separators or mechanically actuated valves) with a passive porous membrane system that relies on molecular size differences and pressure gradients. This substitution eliminates the need for mechanical moving parts and external energy sources, reducing both energy consumption and system complexity.
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
This solution increases fuel cell efficiency by ensuring almost pure hydrogen is recirculated, reducing operating costs and eliminating the need for additional components, while minimizing energy requirements for separation and protecting sensitive components from water and nitrogen.
Implementation Method 1
the pipe wall (36) is in the form of a membrane, in particular in the form of a semi-permeable membrane, wherein the membrane is permeable to the component H2 of the medium and wherein the membrane is impermeable to the components H2O and N2 of the medium
Implementation Method 2
the membrane is permeable to the component H2 of the medium and wherein the membrane is impermeable to the components H2O and N2 of the medium, in particular owing to the molecule size of the respective component
Implementation Method 3
the components H2O and N2 are separated from the medium, in particular from the component H2 of the medium, by means of the centrifugal principle
Data Source
AI summary
The invention relates to a gas-liquid separator (2) for separating at least one liquid component, in particular H2O, from a gaseous component, in particular H2, the separator comprising at least one container (6) which is supplied with a medium via an inlet (16), at least the liquid component of the medium being separated in at least one container (6) and the separated component of the medium being discharged from the at least one container (6) via a discharge valve (46) with the remaining gaseous component of the medium, in particular H2, being recirculated into an outflow line (5) via a first outlet (18). According to the invention, in addition to the liquid component, in particular H2O, a gaseous component N2 is separated from the medium by the gas-liquid separator (2).