Fuel Cell Movable Wall and CO2 Membrane Pressure Management
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Solution Overview
Problem
Direct methanol fuel cells face issues with CO2 generation leading to overpressure, low current and power density, and the need for mechanical pumps for fuel feeding, which results in power losses and malfunctions.
Innovation Solution
A fuel cell structure with a movable wall separating the fuel tank and treatment unit, using a CO2-selective membrane to direct CO2 to a treatment unit where it reacts with a chemical agent, binding CO2 and maintaining a closed system to alleviate pressure issues and enable continuous fuel feeding without pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If CO2 is discharged from the system to eliminate overpressure, then pressure is reduced, but substantial volumes of methanol steam are discharged simultaneously causing poisoning and explosion/fire risks
Solution Approach 1:
The patent divides the fuel cell system into separate functional zones: an anode chamber for fuel oxidation, a CO2 collection chamber, and a cathode chamber. This segmentation allows CO2 to be collected and treated separately from the fuel mixture, enabling pressure relief without discharging harmful methanol steam into the environment
Solution Approach 2:
The patent introduces a CO2-selective membrane as an intermediary component between the anode and cathode chambers. This membrane selectively transports CO2 while blocking methanol and water vapor, acting as a mediator that separates the harmful CO2 byproduct from the fuel mixture, allowing CO2 removal without losing fuel
2Productivity
If mechanical pumps are used for fuel feeding to improve power density, then fuel delivery is enhanced, but power losses and malfunctions occur
Solution Approach 1:
The patent designs a passive fuel delivery system where the fuel cell anode directly draws fuel from the fuel tank through capillary action and pressure differential created during operation. This self-service mechanism eliminates mechanical pumps, reducing energy losses and potential malfunctions while maintaining adequate fuel delivery for power generation
Solution Approach 2:
The patent replaces the mechanical pump system with a passive fluid delivery mechanism based on pressure gradients and capillary forces. This substitution eliminates moving mechanical parts, reducing energy consumption and maintenance requirements while still achieving the necessary fuel flow rates for high power density operation
3Power
If methanol is used as fuel for direct oxidation to produce electrical energy, then fuel cell operation is achieved, but CO2 generation leads to overpressure and requires flushing
Solution Approach 1:
The patent converts the harmful CO2 byproduct into a beneficial resource by collecting it in a dedicated chamber and using it to pressurize the fuel tank. This transforms the overpressure problem into a useful function that drives fuel delivery, eliminating the need for separate pressure management systems while maintaining continuous fuel supply
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 effectively manages pressure differences, allows continuous fuel feeding, eliminates the need for mechanical components, and enhances power density by binding CO2, creating a reliable and efficient fuel cell system.
Implementation Method 1
a CO2-selective membrane to direct CO2 to a treatment unit
Implementation Method 2
the treatment unit for the decomposition products comprises an agent which reacts with decomposition products, mainly carbon dioxide, generated in the fuel cell, especially in such a way that liquid or solid compounds can be generated from them
Data Source
Figure 1
AI summary
Fuel cell structure and method of producing electrical energy from a methanol-based initial material. The fuel cell structure is comprised of a fuel cell (6) for decomposing hydrocarbon-based fuel in order to produce electrical energy, a fuel tank (1) from which fuel can be fed into the fuel cell (6), and a treatment unit (3) for decomposition products, into which unit it is possible to direct the decomposition products of the fuels. The fuel tank and the treatment unit are at least partly separated from each other by a movable wall (2), and the wall is arranged to move to even out the pressure difference and the volume difference between the fuel tank and the treatment unit. The movable wall (2) makes it possible to remove disadvantageous pressure differences between the fuel tank (1) and the treatment unit (3), in which case a continuous feed of fuel into the fuel cell is achieved, which feed continues until either the fuel is expended or the treatment of the decomposition products is brought to an end.