Fuel Cell Gas-Liquid Separator Supercooled Water Prevention
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Solution Overview
Problem
Supercooled water in a gas-liquid separator of a fuel cell system can freeze and attach to valves, preventing normal operation due to the inability to differentiate between water levels and supercooled water states, leading to ice formation and valve malfunction.
Innovation Solution
A fuel cell system with a gas-liquid separator, a discharge passage, a valve, a gas control mechanism, and an information acquiring unit that estimates water temperature, controlling pressure to prevent supercooled water from reaching the valve by maintaining a lower water surface in a bypass passage when supercooled conditions are detected, thus avoiding ice attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure control is implemented to lower water surface in bypass passage, then supercooled water prevention is improved, but system complexity increases
Solution Approach 1:
The system utilizes the existing gas control mechanism, which is already part of the fuel cell system's normal operation, to simultaneously control the water surface level in the bypass passage. By repurposing an existing component for dual functionality, the system achieves supercooled water prevention without adding separate pressure control equipment, thereby avoiding increased system complexity.
Solution Approach 2:
The gas control mechanism is designed to perform multiple functions: controlling gas pressure for fuel cell operation and controlling water surface level in the bypass passage to prevent supercooled water discharge. This multi-functionality eliminates the need for dedicated pressure control equipment, maintaining system simplicity while achieving reliable supercooled water prevention.
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
Prevents supercooled water from attaching to valves, ensuring proper valve operation by maintaining a lower water surface in the bypass passage when supercooled conditions are present, thereby preventing ice formation and ensuring continuous system functionality.
Implementation Method 1
a gas control mechanism configured to change a pressure of gas in the gas-liquid separator
Implementation Method 2
Water which gathers in a gas-liquid separator may be present as supercooled water
Implementation Method 3
the control unit is configured to control a pressure in the gas-liquid separator using the gas control mechanism such that a water surface in the bypass passage is lower than the predetermined height when the information acquired by the information acquiring unit indicates a supercooled state
Data Source
AI summary
When a shut-off valve is opened, gas is discharged via a main passage which is disposed at a predetermined height from a bottom of a gas-liquid separator. Water which gathers in the bottom of the gas-liquid separator flows from a bypass passage to the main passage and is discharged when water level difference>height is satisfied. When water which gathers in the bottom of the gas-liquid separator is supercooled water, discharge of water is avoided by controlling an open pressure and a passage pressure such that water level difference<height is satisfied.