Recirculation Fuel Cell Gas Segmentation
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Solution Overview
Problem
Fuel cells operating in closed environments, such as submarines, face challenges with the release of educts like hydrogen and oxygen, which can lead to hazardous conditions due to the formation of oxyhydrogen and increased fire risk, and inefficient operation due to inert gases like nitrogen and argon.
Innovation Solution
A recirculation fuel cell device with separate inlets for oxygen and hydrogen, and connections for recirculating unconverted gases, along with water separators and adjustable gas discharge valves to minimize educt emissions and maintain optimal inert gas concentrations, ensuring efficient operation and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inert gases are discharged from the fuel cell, then the efficiency is improved, but the emission of educts particularly hydrogen increases
Solution Approach 1:
The gas discharge is segmented into separate pathways: a first gas discharge for inert gases (nitrogen, argon) and a second gas discharge for educts (hydrogen, oxygen). This segmentation allows selective discharge of harmful inert gases while retaining and recirculating valuable educts, thereby improving efficiency without increasing educt emissions.
Solution Approach 2:
The system discards inert gases through the first gas discharge while recovering and recirculating educts through the second pathway. The recirculated educts are fed back into the fuel cell, maximizing resource utilization and preventing harmful emissions while maintaining efficiency.
2Ease of operation
If educts are released to the environment, then the fuel cell operation is simplified, but the safety risk increases due to fire hazard and toxic concentrations
Solution Approach 1:
The patent introduces an intermediary recirculation system with separate gas discharge pathways that mediates between the fuel cell and the environment. Instead of direct release, gases are routed through controlled discharge paths, allowing safe management of educts and inert gases while maintaining operational simplicity.
Solution Approach 2:
The system creates a controlled environment by separating and managing gas flows, effectively creating an inert atmosphere management strategy where educts are recirculated and inert gases are discharged in a controlled manner, reducing fire risks and toxic concentrations in the surrounding environment.
3Object-generated harmful factors
If inert gas concentration is increased, then the educt emission is reduced, but the fuel cell efficiency decreases
Solution Approach 1:
The gas management system is segmented into separate discharge pathways, allowing independent control of inert gas discharge and educt recirculation. This enables the system to discharge inert gases to reduce educt emissions while simultaneously recirculating educts to maintain fuel cell efficiency.
Solution Approach 2:
The system discards inert gases through the first gas discharge while recovering educts through recirculation and feeding them back into the fuel cell. This dual approach reduces educt emissions without compromising efficiency by maintaining adequate educt concentrations through recirculation.
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 recirculation fuel cell device effectively reduces hydrogen emissions, maintains stable operation by adjusting oxygen delivery, and minimizes the risk of hazardous gas concentrations, enhancing safety and efficiency in closed environments.
Implementation Method 1
at the anode, hydrogen (H2) is oxidized to protons (H+) and electrons (e-). The protons pass through a polymer electrolyte membrane to the cathode, the electrons flow through an external circuit, and at the cathode, oxygen is reduced to oxide ions
Implementation Method 2
The protons pass through a polymer electrolyte membrane to the cathode
Data Source
Figure 1
AI summary
The present invention relates to a recirculation fuel cell device with reduced reactant emission. The invention further relates to a method for fully recirculating the anode gas flow of a recirculation fuel cell device. The invention further relates to a submarine with a corresponding fuel cell, and to the carrying out of the method aboard a submarine.