Fuel Cell Stack Hydrogen Pump Vertical Positioning
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Solution Overview
Problem
Existing fuel cell systems face challenges in preventing damage to the fuel cell stack from shocks applied to the hydrogen pump or gas-liquid separator while maintaining efficient hydrogen gas drainage, as the large size of these components can lead to collisions and insufficient drainage efficiency when positioned away from the stack.
Innovation Solution
A fuel cell system configuration where the hydrogen circulation pump and gas-liquid separator are positioned below the lower end of the fuel cell stack, with the gas-liquid separator at the lowest point of the hydrogen gas circulation flow path, ensuring they do not collide with the stack and enhancing drainage efficiency by allowing water to flow down and be separated effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the hydrogen pump and gas-liquid separator are disposed within the visible outline of the fuel cell stack end plate, then the size of the fuel cell system is reduced, but the risk of collision and damage to the fuel cell stack upon shock increases
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement (disposing components within the end plate outline) to a three-dimensional spatial arrangement by positioning the hydrogen pump and gas-liquid separator below the fuel cell stack in the vertical dimension. This allows the components to be closely integrated with the stack while being protected from lateral shocks that would occur at the same horizontal level.
2Reliability
If the hydrogen pump and gas-liquid separator are placed away from the fuel cell stack, then collision damage is avoided, but drainage efficiency in the hydrogen gas circulation system becomes insufficient
Solution Approach 1:
The patent utilizes the vertical dimension to position drainage components (gas-liquid separator and hydrogen pump) directly below the fuel cell stack, creating a gravity-assisted drainage path. This vertical arrangement enables efficient water separation and circulation while maintaining close proximity to the stack, thereby achieving both protection and high drainage efficiency.
Solution Approach 2:
By positioning the gas-liquid separator at the lowest point of the hydrogen gas circulation system and directly below the fuel cell stack, the patent creates a gravity-driven flow path where water naturally drains from the stack to the separator without requiring additional pumping energy, thus optimizing drainage efficiency.
3Productivity
If the gas-liquid separator is not positioned at the lowest point of the hydrogen gas circulation flow path, then drainage efficiency is reduced, but component protection is compromised
Solution Approach 1:
The patent positions the gas-liquid separator at the lowest point of the hydrogen gas circulation flow path, creating a gravity-driven drainage system where water naturally flows from the fuel cell stack to the separator. This arrangement maximizes drainage efficiency while the vertical positioning below the stack provides protective spacing against lateral shocks.
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 configuration prevents damage to the fuel cell stack from shocks and improves drainage efficiency by ensuring the hydrogen circulation pump and gas-liquid separator are protected from collisions and water accumulation, respectively.
Implementation Method 1
a hydrogen circulation pump provided midway on the hydrogen gas circulation flow path to pressurize and feed hydrogen off-gas
Implementation Method 2
a gas-liquid separator provided midway on the hydrogen gas circulation flow path to separate water content from the hydrogen off-gas. A position where the gas-liquid separator is provided on the hydrogen gas circulation flow path is the lowest site of the hydrogen gas circulation flow path
Data Source
AI summary
The fuel cell system includes: a fuel cell stack, a hydrogen inlet, a hydrogen outlet, an air inlet, and an air outlet; a hydrogen supply flow path; a hydrogen circulation flow path for circulating gas from the hydrogen outlet to a merging point of the hydrogen supply flow path; a hydrogen pump on the hydrogen circulation flow path; and a gas-liquid separator on the hydrogen circulation flow path. The hydrogen inlet is positioned above the hydrogen outlet, the air inlet is positioned on an upper side of the air outlet, and a direction of connection between the hydrogen inlet and the hydrogen outlet and a direction of connection between the air inlet and the air outlet intersect each other. An upper end of the hydrogen pump is positioned below the stack. The gas-liquid separator is provided at the lowest site of the hydrogen circulation flow path.