Solid Oxide Fuel Cell Reformer Catalyst Temperature Control
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Solution Overview
Problem
Conventional fuel cell systems require complex structures with liquid nitrogen storage tanks and nitrogen supply equipment to prevent damage at power generation stoppage in solid oxide fuel cells, leading to increased complexity.
Innovation Solution
A reformer system with a reforming catalyst that introduces a source fuel, heating means, air introduction means, and temperature detection, allowing controlled reduction of source fuel and air introduction to maintain catalyst temperature above unreformed gas generation temperatures during power generation stoppage, preventing damage without the need for liquid nitrogen storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid nitrogen storage tank and nitrogen supply equipment are provided to prevent fuel cell damage at stoppage, then fuel cell reliability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the nitrogen supply function from the system by eliminating the liquid nitrogen storage tank and nitrogen supply equipment. Instead, it uses the existing reformer system to generate protective gas through controlled fuel reforming, thereby removing complex external protection equipment while maintaining fuel cell safety during stoppage.
Solution Approach 2:
The reformer system is given a dual function: it not only produces reformed gas for fuel cell operation but also generates protective atmosphere during stoppage. By controlling the reforming reaction conditions, the same equipment serves both operational and protective functions, eliminating the need for separate nitrogen supply systems.
2Reliability
If source fuel amount is reduced and air is introduced to maintain catalyst temperature, then unreformed gas generation is prevented, but energy consumption increases
Solution Approach 1:
The patent changes the operational parameters of the reformer by introducing air and controlling fuel flow rate to maintain catalyst temperature above the unreformed gas generation threshold. This parameter adjustment ensures complete reforming reaction while minimizing energy waste through optimized combustion conditions during the stoppage period.
Solution Approach 2:
The system implements periodic control of fuel supply and air introduction to the reformer, activating heating and air supply only when needed to maintain temperature above the critical threshold, then reducing input when temperature is sufficient. This periodic action prevents continuous energy consumption while ensuring unreformed gas prevention.
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 simplifies the fuel cell system by preventing damage during power generation stoppage in solid oxide fuel cells, ensuring continuous operation and avoiding the need for complex nitrogen supply systems.
Implementation Method 1
a reformer generating a reformed gas by reforming a source fuel through the use of a reforming catalyst
Implementation Method 2
a heating means for heating the reforming catalyst
Implementation Method 3
an air introducing means for introducing air into the reforming catalyst
Implementation Method 4
a temperature detecting means for detecting the temperature of the reforming catalyst
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In fuel cell system 1, at the stop of power generation in fuel cell 3, the amount of a source fuel introduced to a reforming catalyst 2a of a reformer 2 is reduced, but at this time, before the temperature of the reforming catalyst 2a falls to an unreformed gas generation temperature, air is introduced to the reforming catalyst 2a to raise the temperature of the reforming catalyst 2a. At this time, before the temperature of the reforming catalyst 2a falls to an unreformed gas generation temperature, at least one of heating the reforming catalyst 2a and introducing air into the reforming catalyst 2a is performed. This raises the temperature of the reforming catalyst 2a and therefore, the generation of the unreformed gas is prevented and the reformed gas is supplied to the fuel cell 3, at the stop of power generation in the fuel cell 3.