Fuel Cell Pumping Hydrogen Suppression via Voltage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fuel cell systems face challenges in suppressing the discharge of pumping hydrogen during low-efficiency power generation, as existing dilution methods may fail when broken, leading to hydrogen concentration exceeding environmental limits.
Innovation Solution
A fuel cell system with control means that reduces the reactant gas supply and sets a voltage lower limit to minimize anode gas formation in the cathode, allowing for reduced pumping hydrogen discharge without relying on dilution means, and includes abnormality judgment for dilution system failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dilution means is provided on the cathode side to decrease pumping hydrogen concentration, then hydrogen discharge concentration is reduced, but system complexity and reliability are worsened due to additional components that can fail
Solution Approach 1:
The invention extracts and eliminates the dilution means (bypass passage, bypass valve, back pressure valve) from the system. Instead of using these additional components to dilute pumping hydrogen, the patent controls the fuel cell operation parameters (reactant gas supply amount, voltage lower limit) to directly suppress pumping hydrogen formation at the source, thereby reducing hydrogen discharge without adding unreliable components
Solution Approach 2:
The fuel cell system performs self-regulation by controlling its own operation parameters. The control means adjusts the reactant gas supply amount and voltage lower limit to automatically suppress pumping hydrogen formation during low-efficiency power generation, eliminating the need for external dilution mechanisms and their associated reliability issues
2Object-affected harmful factors
If dilution means is provided to decrease pumping hydrogen concentration, then hydrogen discharge is reduced, but device complexity increases due to additional dilution components
Solution Approach 1:
The invention removes the dilution means (bypass passage, bypass valve, back pressure valve) from the system configuration. By controlling the fuel cell operation parameters instead, the patent eliminates these additional components and their associated complexity while achieving the same goal of reducing pumping hydrogen discharge
Solution Approach 2:
The control means performs multiple functions: it manages normal power generation, low-efficiency power generation, and pumping hydrogen suppression through voltage lower limit control. This multi-functionality eliminates the need for separate dilution components, reducing device complexity while maintaining effectiveness
3Object-generated harmful factors
If reactant gas supply is reduced for low-efficiency power generation, then pumping hydrogen formation is suppressed, but power generation efficiency is worsened
Solution Approach 1:
The invention changes the operation parameters by setting a voltage lower limit during low-efficiency power generation. This parameter change allows the system to operate at reduced reactant gas supply (suppressing pumping hydrogen) while maintaining acceptable power generation by controlling the voltage to stay above the lower limit, thus resolving the contradiction between hydrogen suppression and efficiency
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 suppresses pumping hydrogen discharge to predetermined levels, potentially omitting the need for dilution means and enabling efficient low-efficiency power generation while maintaining warm-up capabilities.
Implementation Method 1
a fuel cell for receiving a supplied reactant gas (a fuel gas and an oxidizing gas) to generate a power
Data Source
AI summary
Disclosed is a fuel cell system including a fuel cell which generates a power, and control means for decreasing the amount of a reactant gas to be supplied to the fuel cell to an amount smaller than that during normal power generation to realize low-efficiency power generation of the fuel cell. The control means sets the voltage lower limit value of the fuel cell so that the amount of an anode gas (pumping hydrogen) to be formed in a cathode of the fuel cell during the low-efficiency power generation is a predetermined amount or less.