Hydrogen Generator Evaporation Efficiency via Segmented Diffusion
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Solution Overview
Problem
The preparation and transport of hydrogen are inconvenient, making it difficult to obtain, and direct methanol fuel cells face challenges in increasing feed rate and evaporation efficiency for improved power generation.
Innovation Solution
A hydrogen-generating device with a substrate structure that includes liquid and gas containers, diffusion areas, and diverging channels, where liquid diffusion structures act as micro heaters to enhance heat transfer and evaporation efficiency, preventing reverse flow interference and guiding methanol gas and oxygen into a gas reaction channel for effective hydrogen generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If liquid methanol is used as feed in DMFC, then the acquirability of feed is improved, but the evaporation efficiency and feed rate need to be increased to improve power generation efficiency
Solution Approach 1:
The liquid diffusion area is segmented into multiple regions with different diffusion structures (first liquid diffusion structures and second liquid diffusion structures) arranged in arrays. This segmentation increases the total evaporation surface area and improves evaporation efficiency while maintaining ease of feed acquisition.
Solution Approach 2:
The invention introduces a vertical dimension to the diffusion process by creating multi-layered diffusion structures with different heights and configurations. The first and second liquid diffusion structures are arranged at different levels, increasing the effective evaporation area without significantly increasing the horizontal footprint.
2Quantity of substance
If hydrogen is prepared and transported for fuel cells, then hydrogen can be obtained, but the preparation and transport are inconvenient
Solution Approach 1:
The invention uses liquid methanol as an intermediary substance that can be easily stored and transported. The methanol is then converted to hydrogen on-demand within the device through controlled evaporation and reaction processes, eliminating the need for complex hydrogen storage and transport infrastructure.
Solution Approach 2:
The device incorporates an on-demand hydrogen generation system that converts methanol to hydrogen internally. This self-service approach allows the system to produce its own hydrogen fuel from a stable liquid precursor, eliminating external hydrogen supply requirements and simplifying operation.
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 device increases evaporation efficiency of the liquid feed, enhancing heat transfer and guiding reactants into the gas reaction channel, thereby improving hydrogen generation for fuel cells.
Implementation Method 1
a heater... each of the first liquid diffusion structures and each of the second liquid diffusion structures can be indirectly used as a micro heater, and therefore the heated area of the liquid feed can be increased
Implementation Method 2
each of the first liquid diffusion structures and each of the second liquid diffusion structures can be indirectly used as a micro heater, and therefore the heated area of the liquid feed can be increased. Therefore, the heat transfer efficiency of the heater to the liquid feed can be increased
Implementation Method 3
via the diverging channels, interference to the flow direction of the liquid feed due to the reverse flow of gas evaporated from the liquid feed can be prevented
Implementation Method 4
the evaporation efficiency of the liquid feed can be increased and methanol gas and oxygen can be effectively guided into the subsequent gas reaction channel
Data Source
AI summary
A hydrogen-generating device is provided, wherein a first substrate includes a liquid container and a first gas container at a first side thereof, and the first substrate sequentially includes a first and second liquid diffusion area and a diverging channel area from the liquid container to the first gas container. The first and second liquid diffusion areas respectively have a plurality of liquid diffusion structures, and the diverging channel area has a plurality of diverging channels. A laminate covers the first side of the first substrate and includes a liquid feed inlet connected to the liquid container. The first side of a second substrate covers the second side of the first substrate and includes a second gas container and a gas reaction channel located at the first side. A catalyst is disposed in the gas reaction channel and a heater is disposed on the second side of the second substrate.