Two-Stage Fuel Reformer Using Copper Catalyst for Low-Cost SOFC Feed Gas
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Solution Overview
Problem
High investment costs associated with the use of precious metals like platinum group metals (PGM) in steam reaction catalysts for fuel reformers in large-scale SOFC systems, along with ethical and social concerns related to their mining and supply chain.
Innovation Solution
A fuel reformer device with a separated two-stage structure, utilizing a copper-containing catalyst material in the steam reforming stage, which is thermally delimitated from the high-temperature methanation reaction stage, reducing the need for PGMs and lowering costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If platinum group metals (PGM) are used as steam reaction catalyst in the fuel reformer, then high hydrogen yield and catalytic activity at elevated temperatures are achieved, but investment costs and ethical concerns related to precious metal mining increase significantly
Solution Approach 1:
The patent replaces expensive platinum group metals with cheaper base metals (nickel, iron, cobalt, manganese, zinc, calcium, or their oxides) as catalyst materials. Although base metal catalysts may have shorter lifespan or require more frequent replacement compared to PGMs, their significantly lower cost makes them economically viable for large-scale SOFC systems, directly addressing the contradiction between productivity and manufacturing cost.
Solution Approach 2:
The patent modifies the operating parameters of the steam reforming process to be compatible with base metal catalysts. Specifically, it controls the temperature in the steam reforming zone to remain below 350°C (while the downstream methanation zone operates at higher temperatures), which prevents oxidation and degradation of the base metal catalyst. This parameter change enables the use of cheap catalysts while maintaining adequate hydrogen production efficiency.
2Use of energy by moving object
If the steam reforming catalyst is exposed to high temperatures from the exothermic methanation reaction, then thermal energy is available to drive the endothermic reforming reaction, but the catalyst material degrades through oxidation and loses catalytic activity
Solution Approach 1:
The patent divides the fuel reformer into two distinct stages: a steam reforming zone and a methanation zone. The steam reforming zone, containing the base metal catalyst, is thermally isolated and maintained below 350°C. The methanation zone operates at higher temperatures downstream. This spatial segmentation prevents hot gases from the exothermic methanation reaction from contacting and oxidizing the catalyst in the reforming zone, while still allowing thermal energy from methanation to drive the endothermic reforming reaction through heat exchange.
Solution Approach 2:
The patent introduces a thermal barrier or heat exchange mechanism as an intermediary between the methanation zone and the steam reforming zone. This intermediary allows thermal energy to be transferred from the high-temperature methanation reaction to drive the endothermic reforming reaction, while physically preventing direct contact between hot gases and the catalyst, thus protecting catalyst stability while utilizing thermal energy.
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
The use of copper-containing catalysts in the fuel reformer device significantly reduces investment costs, avoids ethical concerns related to PGM mining, and enhances the efficiency of SOFC systems by optimizing methane content in the reformate gas.
Implementation Method 1
A steam reforming space is provided in which an endothermic steam reforming reaction of the process gas occurs, for generating a product gas
Implementation Method 2
A catalyst which is exposed to the process stream promotes a production of a hydrogen H2 rich and carbon monoxide CO poor reformed product gas
Implementation Method 3
A methanation reacting space is provided in which an exothermic methanation reaction of the product gas occurs, for generating a fuel gas having an enriched concentration of methane CH4
Implementation Method 4
the separated two-stage structure provides for thermal delimiting, along the process stream, an upstream low temperature zone accommodating the steam reforming catalyst against a downstream high temperature zone of the exothermic methanation reaction
Data Source
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AI summary
The present invention relates to a fuel reformer device (10) and method for reforming a raw fuel to a reformate fuel gas to be fed into a high-temperature fuel cell (30). As an essential aspect of the invention, a steam reforming catalyst (12) contains copper and the fuel reformer device (10) comprises a separated two-stage structure (14) defining a steam reformer stage (11) and a methanation reactor stage (13) for thermal delimiting an upstream low temperature zone accommodating the steam reforming catalyst (12) against a downstream high temperature zone of the exothermic methanation reaction.