Catalytic Fuel Processor Layout for Compact Hydrogen Reforming
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Solution Overview
Problem
Existing hydrogen production systems for distributed energy applications are inefficient and costly due to the need for large, bulky infrastructure and the inefficiency of transporting hydrogen, and existing reformers are large and costly due to the separation required between combustion and reforming zones, with catalyst replacement being a problem.
Innovation Solution
A compact reformer design with integrated combustion and reforming zones using corrugated fecralloy sheets coated with catalysts, allowing for efficient heat transfer and easy catalyst replacement, reducing the size and cost of the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If traditional steam methane reforming reactors use fired furnaces with combustion burners, then the required heat is supplied, but the system becomes very large and costly due to the distance required between burners and reforming tubes
Solution Approach 1:
The patent combines the combustion zone and reforming zone into a single integrated reactor vessel, eliminating the need for separate fired furnaces and allowing direct heat transfer from combustion to reforming reactions, thereby reducing overall system size while maintaining heat supply efficiency
Solution Approach 2:
The reactor is divided into distinct combustion and reforming zones within the same vessel, with catalyst-containing tubes positioned to receive direct heat from combustion, enabling efficient heat transfer without requiring large distances between heat source and reaction zones
2Use of energy by stationary object
If catalyst is coated directly on reforming tubes, then heat transfer is efficient, but catalyst replacement becomes problematic and requires whole reactor replacement
Solution Approach 1:
The catalyst is contained within removable tubes that can be independently extracted from the reactor, separating the catalyst containment function from the reactor structure and enabling catalyst replacement without replacing the entire reactor
Solution Approach 2:
The catalyst-containing tubes are designed to be removable from the reactor, allowing the catalyst to be extracted and replaced independently from the reactor vessel, thus maintaining heat transfer efficiency while enabling easy catalyst replacement
3Productivity
If high temperatures (>1000°C) are used for reforming reactions, then reaction efficiency improves, but tube materials are destroyed due to high temperature exposure
Solution Approach 1:
The patent introduces a ceramic foam structure as an intermediary heat transfer medium between the combustion zone and reforming tubes, allowing high temperature heat transfer while protecting the metal reforming tubes from direct exposure to extreme temperatures that would cause material failure
Solution Approach 2:
Ceramic foam material is used to facilitate heat transfer from the combustion zone to the reforming tubes, providing high surface area for heat exchange while withstanding high temperatures and protecting the metal tubes from thermal damage
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 design achieves efficient hydrogen production with reduced capital and installation cost. The efficacy is achieved by the design achieves efficient hydrogen production with reduced capital and installation cost. The efficacy is achieved by the design achieves efficient hydrogen production with reduced capital and installation cost. The efficacy is achieved by the design achieves efficient heat transfer and used on the reforming zone.
Implementation Method 1
The two sections are separated by a metal partition and are in close thermal contact so as to facilitate the efficient transfer of heat from the combustion to the reforming sections
Implementation Method 2
Combustion takes place over a suitable structured catalyst that can be removed and replaced when its effectiveness declines
Implementation Method 3
hydrocarbons or oxygenates are reformed to produce a hydrogen rich stream which can be fed to a fuel cell for electrical and thermal energy production
Data Source
Figure 1A
Figure 1B~1C
Figure 1D
AI summary
A highly compact heat integrated fuel processor, which can be used for the production of hydrogen from a fuel source, suitable to feed a fuel cell, is described. The fuel processor assembly comprises a catalytic reforming zone (29) and a catalytic combustion zone (28), separated by a wall (27). Catalyst able to induce the reforming reactions is placed in the reforming zone and catalyst able to induce the combustion reaction is placed in the combustion zone, both in the form of coating on a suitable structured substrate, in the form of a metal monolith. Fe-Cr-AI-Y steel foils, in corrugated form so as to enhance the available area for reaction, can be used as suitable substrates The reforming and the combustion zones can be either in rectangular shape, forming a stack with alternating combustion / reforming zones or in cylindrical shape forming annular sections with alternating combustion / reforming zones, in close contact to each other. The close placement of the combustion and reforming catalyst facilitate efficient heat transfer through the wall which separates the reforming and combustion chambers.