Fuel Cell Odorant Deposition Control
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Solution Overview
Problem
In fuel cell systems, odorants added to hydrogen can condense and deposit in the fuel cell at low temperatures, inhibiting power generation by blocking gas flow paths and electrode reactions.
Innovation Solution
A fuel cell system with a hydrogen supply path, an estimation unit to detect odorant deposition, and a control unit that elevates the fuel cell temperature to vaporize and discharge the deposited odorant, preventing its accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If odorant is mixed into hydrogen to allow early detection of hydrogen leakage, then safety of hydrogen supply is improved, but odorant may condense and deposit in the fuel cell at low temperatures, worsening power generation performance
Solution Approach 1:
The system performs preliminary detection of low-temperature operation conditions and proactively controls odorant supply or activates heating before condensation and deposition occur. This prevents the harmful effect while maintaining the safety benefit of odorant addition.
Solution Approach 2:
The system changes the temperature parameter of the fuel cell by activating heating when low temperature is detected, thereby changing the physical state of the odorant from condensed to vaporized, eliminating deposition and restoring power generation performance.
2Duration of action of moving object
If fuel cell operates continuously at low temperature, then operational duration is extended, but odorant condenses and deposits in the fuel cell, worsening system reliability
Solution Approach 1:
The system continuously monitors temperature and operational duration, and provides feedback control by activating heating or adjusting odorant supply when deposition conditions are detected, thereby maintaining system reliability during extended operation.
Solution Approach 2:
The system detects prolonged low-temperature operation as a precursor to deposition and takes preliminary corrective action (heating or odorant supply adjustment) before actual deposition occurs, preventing reliability degradation.
3Productivity
If temperature of fuel cell is elevated to vaporize deposited odorant, then power generation performance is restored, but energy consumption increases
Solution Approach 1:
The system applies partial heating or intermittent odorant supply adjustment rather than continuous full heating, achieving sufficient vaporization of deposited odorant while minimizing unnecessary energy consumption.
Solution Approach 2:
The system temporarily changes the temperature parameter only when deposition is detected, rather than maintaining elevated temperature continuously, thereby restoring power generation performance while minimizing energy consumption during normal 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
Prevents odorant deposition from hindering power generation by ensuring the odorant is vaporized and discharged, maintaining the fuel cell's operational efficiency.
Implementation Method 1
a control unit configured to elevate a temperature of the fuel cell to a temperature allowing at least a part of the odorant deposited in the fuel cell to be vaporized
Implementation Method 2
If a temperature of the fuel cell is equal to or lower than a boiling point of the odorant at this time, a part of the odorant is condensed (liquefied)
Data Source
AI summary
A fuel cell system includes a hydrogen path for supplying odorant-added hydrogen to the fuel cell, an estimating unit to estimate the depositing of the odorant in the fuel cell, and control unit to heat the fuel cell up to a temperature at which at least part of the odorant deposited in the fuel cell evaporates when the depositing of the odorant is estimated.