Fuel Cell Humidifier Valve for Low-Output Hydrogen Dilution
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Solution Overview
Problem
Fuel cell systems face challenges in reducing hydrogen concentration in exhaust gases, particularly at low output states, where existing methods are limited in effectiveness and often require separate power sources for operation.
Innovation Solution
A humidifier for fuel cells is designed with a membrane module, cap structures for air supply and discharge, an exhaust gas inlet and outlet, and a valve system that allows selective communication between air and exhaust gas regions, using pressure differences to introduce supply air and reduce hydrogen concentration without external power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If existing hydrogen concentration reduction methods are used, then hydrogen concentration can be reduced at high output states, but they are limited in effectiveness at low output states and require separate power sources
Solution Approach 1:
The patent combines the hydrogen concentration reduction function with the existing humidifier structure by integrating a valve mechanism that redirects supply air to the exhaust gas outlet. This merging eliminates the need for separate power sources while maintaining effectiveness at low output states, as the valve uses the existing air supply system's pressure differential to operate.
Solution Approach 2:
The valve mechanism operates autonomously by utilizing the pressure differential between the supply air inlet and exhaust gas outlet. When the fuel cell stack operates at low output states with high hydrogen concentration, the valve automatically opens to allow supply air to mix with exhaust gas, reducing hydrogen concentration without requiring external power input.
2Quantity of substance
If supply air is introduced to reduce hydrogen concentration, then hydrogen concentration decreases, but additional power consumption increases
Solution Approach 1:
The system uses the existing pressure differential in the air supply system to drive the valve mechanism. The supply air's own pressure opens the valve when hydrogen concentration is high, eliminating the need for external power input. This self-service approach reduces energy consumption while maintaining effective hydrogen concentration control.
Solution Approach 2:
The valve mechanism responds to changes in pressure parameters within the system. When the fuel cell stack operates at low output states, the pressure differential changes trigger the valve to open, allowing supply air to mix with exhaust gas. This parameter-based control enables automatic adjustment without additional power consumption.
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
Effectively reduces hydrogen concentration in exhaust gases discharged from the humidifier even at low fuel cell stack output states, ensuring safety and efficiency without the need for a separate power source.
Implementation Method 1
a valve configured to provide selectively communication between a first region, where the supply air flows, including the first cap and the second cap and a second region, where the exhaust gas flows
Implementation Method 2
a membrane module accommodating a humidifying membrane
Data Source
AI summary
A fuel cell humidifier includes a membrane module accommodating a humidifying membrane, a first cap coupled to a first side of the membrane module and supplying a supply air to the humidifying membrane, and a second cap coupled to a second side of the membrane module and discharging a humidified supply air from the humidifying membrane to a cathode of a fuel cell stack. An exhaust gas inlet is coupled to the membrane module and provides an exhaust gas discharged from the stack and an exhaust gas outlet is coupled to the membrane module and discharges a dehumidified exhaust gas, which passes through the membrane module, to an exhaust system. A valve provides selective communication between a first region, where the supply air flows, including the first and second caps and a second region, where the exhaust gas flows, including the exhaust gas inlet and the exhaust gas outlet.