Fuel Cell Cathode Exhaust Drying for Moisture-Safe Fire Protection
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Solution Overview
Problem
Existing fire protection systems using oxygen-reduced cathode exhaust gas from fuel cells can introduce excessive moisture into shelters, leading to issues like snow or ice formation in frozen areas, mold in archive rooms, and corrosion or short circuits in automated high-bay warehouses or server rooms.
Innovation Solution
A fire protection system that includes a fuel cell with a cathode exhaust output strictly separated from the anode output, a drying system to dry the oxygen-reduced cathode exhaust gas, and a control system that determines the current dew point and only allows the dried gas into the shelter if it is below a maximum adjustable dew point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen-reduced cathode exhaust gas from a fuel cell is used to reduce fire risk in a shelter, then fire protection effectiveness is improved, but excessive moisture is introduced into the shelter causing snow/ice formation, mold growth, corrosion, or short circuits
Solution Approach 1:
The patent extracts and removes moisture from the cathode exhaust gas using a drying system positioned between the fuel cell and the shelter. This separation allows the fire protection function to be maintained while the harmful moisture component is extracted and eliminated before the gas enters the shelter.
Solution Approach 2:
The patent introduces a drying system as an intermediary component between the fuel cell and the shelter. This intermediary device processes the cathode exhaust gas by removing moisture, allowing the beneficial fire protection properties to pass through while blocking the harmful moisture.
2Temperature
If the cathode exhaust gas is cooled before introduction into the shelter to reduce heat input, then heat input is reduced, but the system complexity and energy consumption increase
Solution Approach 1:
The patent converts the harmful moisture content in the cathode exhaust gas into a beneficial indicator by using it as the basis for dew point measurement. The dew point measurement provides information about the gas state without requiring active cooling, and the control system uses this information to manage gas introduction safely.
3Object-affected harmful factors
If the dew point of the dried cathode exhaust gas is monitored and gas is only introduced when dew point is below maximum threshold, then moisture-related damage is prevented, but the system requires additional measurement and control complexity
Solution Approach 1:
The patent implements a feedback control system where the dew point measurement continuously monitors the state of the dried cathode exhaust gas. This feedback information is used by the control system to make real-time decisions about whether to allow gas introduction into the shelter, ensuring moisture-related damage is prevented while maintaining efficient 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
Ensures that the oxygen-reduced cathode exhaust gas is dry enough for use in shelters, preventing moisture-related issues such as snow, ice, mold, corrosion, or short circuits, while also eliminating the need for cooling the gas, thus reducing heat input into the shelter.
Implementation Method 1
a drying system connected downstream of the cathode exhaust gas outlet for drying the oxygen-reduced cathode exhaust gas
Data Source
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AI summary
The present invention relates to a fire protection system (1) for reducing the risk of fire in a protected room, wherein the fire protection system (1) comprises: - a fuel cell (3) with a cathode exhaust outlet (25) strictly separated from an anode outlet (27) for providing an oxygen-reduced cathode exhaust gas with an oxygen content of at most 15.0 vol.-% at the cathode exhaust outlet (25), - a drying system (35) connected downstream of the cathode exhaust outlet (25) for drying the oxygen-reduced cathode exhaust before the oxygen-reduced cathode exhaust is introduced into the protective chamber (54), and - a control system (51) configured to determine an actual dew point of the oxygen-reduced cathode exhaust dried by the drying system (35) and to introduce the dried oxygen-reduced cathode exhaust into the protective chamber (54) only if the actual dew point is below an adjustable maximum dew point.