Fuel Cell Reformer Catalyst Regeneration via Oxidant Gas
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Solution Overview
Problem
The challenge in fuel cell systems is the deposition of soot particles on the catalyst in the reformer, which increases flow resistance and impairs system functionality, particularly when anode exhaust gas recirculation is used, and regenerating the catalyst during operation is not feasible due to temperature constraints that could damage the anode side.
Innovation Solution
A regeneration process for the catalyst is initiated only when the fuel cell has cooled below a predetermined limit temperature, using oxidant gas to burn off particles or operating the reformer as a burner with excess oxygen to safely remove soot deposits, with control mechanisms to manage temperatures and ensure the process occurs when the system is safe from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catalyst in the reformer is regenerated during operation of the fuel cell system, then the particle or soot deposits are burned off and the catalyst functionality is restored, but the high temperatures and reaction products would damage the anode side of the fuel cell
Solution Approach 1:
The system performs a cooling-down phase before initiating catalyst regeneration. The controller monitors the fuel cell temperature and only allows regeneration to proceed once the temperature falls below the predetermined limit temperature, preventing thermal damage to the anode while enabling catalyst restoration
Solution Approach 2:
The controller continuously monitors the temperature of the fuel cell and uses this feedback to control the timing of the regeneration process. The regeneration is initiated only when temperature feedback indicates the fuel cell has cooled sufficiently, creating a closed-loop control system that prevents anode damage
2Productivity
If the fuel cell system operates with anode exhaust gas recirculation, then mixture formation is improved, but particle or soot deposits accumulate on the catalyst more frequently
Solution Approach 1:
The system implements periodic catalyst regeneration cycles during which oxidant gas is supplied to burn off accumulated soot particles. This periodic cleaning action restores catalyst functionality while allowing anode exhaust gas recirculation to continue during normal operation, maintaining the benefits of improved mixture formation
Solution Approach 2:
The regeneration process discards the harmful soot deposits by burning them off with oxidant gas, converting the harmful accumulated particles into harmless combustion products that are expelled from the system, thereby restoring the catalyst to its original functionality
3Object-affected harmful factors
If the fuel cell is allowed to cool down before regeneration, then the risk of anode side damage is reduced, but the regeneration process is delayed until shutdown
Solution Approach 1:
The system dynamically adjusts the regeneration timing based on the cooling rate and temperature profile of the fuel cell. Rather than using a fixed time delay, the controller monitors temperature continuously and initiates regeneration as soon as the dynamic cooling process brings the temperature below the safety threshold, optimizing both protection and timing
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
This approach significantly reduces the risk of anode side damage during regeneration by ensuring the fuel cell has cooled, allowing for effective catalyst cleaning without disrupting the fuel cell or reformer processes, thereby maintaining system integrity and performance.
Implementation Method 1
A regeneration process for regenerating the catalytic converter is carried out when the fuel cell system is switched off, in which the reformer is charged with oxidant gas for the regeneration of the catalytic converter
Implementation Method 2
a fuel cell for generating electricity from oxidant gas and fuel gas
Implementation Method 3
it converts a rich mixture of oxidant gas and fuel by means of partial oxidation
Data Source
Figure 1
AI summary
Fuel cell system for motor vehicle, comprises fuel cell (2) for power generation from oxidator- and fuel gas with an anode inlet (4), an anode outlet (5), a cathode inlet (6), a cathode outlet (7) and with supply terminal, and a reformer (3) for fuel generation from oxidator gas and fuel with catalyst, a fuel inlet, oxidator inlet and with fuel outlet. A fuel gas line is connected with the fuel inlet and the anode inlet. An oxidator guiding device is used for providing the fuel cell and the reformer. A fuel-guiding device is used for providing the reformer with fuel. The fuel cell system for motor vehicle, comprises fuel cell (2) for power generation from oxidator- and fuel gas with an anode inlet (4), an anode outlet (5), a cathode inlet (6), a cathode outlet (7) and with supply terminal, and a reformer (3) for fuel generation from oxidator gas and fuel with catalyst, a fuel inlet, oxidator inlet and with fuel outlet. A fuel gas line is connected with the fuel inlet and the anode inlet. An oxidator guiding device is used for providing the fuel cell and the reformer. A fuel-guiding device is used for providing the reformer with fuel. Sensors are used for determining the temperature of the fuel cell and the reformer. A control system is used for operating the oxidator- and fuel-guiding device. The control system is arranged and carries out a regeneration process for the regeneration of the catalyst in the power down of the fuel cell system. The control system operates the reformer as a burner during the regeneration process. The control system reduces or stops the burner operation of the reformer during the regeneration process, when the temperature of the reformer lies above a pre-determined reformer threshold temperature and/or increases or starts the burner operation of the reformer during the regeneration process, when the temperature of the fuel cell lies below the fuel cell threshold temperature and/or the temperature of the reformer lies below the reformer threshold temperature. An independent claim is included for a method for power down of a fuel cell system.