Rolled Metallic Monolith Catalyst Inserts for High Aspect Ratio Steam Reforming
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Solution Overview
Problem
Conventional steam reforming reactors face challenges with heat transfer efficiency, pressure drop, and catalyst stability due to the low thermal conductivity and coefficient of thermal expansion of traditional catalysts, especially in small diameter, high aspect ratio reactors, which limits their ability to achieve high hydrocarbon conversion and catalyst surface area effectively.
Innovation Solution
The use of rolled metallic monolith catalyst inserts with 3D surface features, comprising peaks and grooves, provides mechanical support and open gas channels, enhancing gas mixing and heat transfer while maintaining catalyst stability, even at elevated temperatures, and is designed for small diameter tubular reactors with aspect ratios from 50 to 1000.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalyst particles are used in small diameter high aspect ratio reactors, then catalyst bed stability is compromised due to thermal expansion mismatch, but using structured metallic catalyst inserts maintains stability while improving heat transfer
Solution Approach 1:
The invention changes the material parameter of the catalyst support from conventional low-conductivity materials (alumina, silica) to high-conductivity metallic materials. This parameter change simultaneously improves heat transfer efficiency while maintaining catalyst stability through matched thermal expansion coefficients with the reactor tube.
Solution Approach 2:
The invention uses composite metallic structures where the catalyst is supported on a metallic monolith or honeycomb structure. This composite approach combines the mechanical stability of metal with catalytic functionality, enabling both improved heat transfer and structural stability in high aspect ratio reactors.
2Productivity
If catalyst particles are used to provide catalytic surface area, then hydrocarbon conversion is limited by heat transfer, but metallic monolith inserts with 3D surface features enhance both surface area and heat transfer
Solution Approach 1:
The invention transitions from conventional two-dimensional catalyst surfaces to three-dimensional metallic monolith structures with extended surface areas. The 3D surface features including corrugations, fins, and hierarchical structures provide dramatically increased catalytic surface area while maintaining excellent heat transfer contact with the reactor wall.
Solution Approach 2:
The invention employs porous metallic monoliths and honeycomb structures that provide high surface area to volume ratios. The porous metallic structure allows reactant penetration while maintaining structural integrity and thermal contact, enabling simultaneous improvement of reaction productivity and heat transfer.
3Stability of the object's composition
If support structures are added to hold catalyst particles, then catalyst position is maintained, but device complexity and pressure drop increase
Solution Approach 1:
The invention extracts the support function from separate discrete support structures and integrates it into the catalyst carrier itself. The metallic monolith and honeycomb structures serve as self-supporting catalyst carriers, eliminating the need for additional support elements and reducing overall device complexity.
Solution Approach 2:
The metallic catalyst insert performs multiple functions simultaneously: it provides mechanical support for the catalyst, enables heat transfer, maintains structural stability through matched thermal expansion, and provides catalytic surface area. This multi-functionality eliminates the need for separate support structures.
4Ease of manufacture
If conventional catalysts are used in high aspect ratio reactors, then manufacturing is simpler, but heat flux from reactor wall to catalyst is insufficient
Solution Approach 1:
The invention uses porous metallic monoliths and honeycomb structures that can be manufactured using established techniques such as extrusion, casting, or additive manufacturing. These porous metallic structures provide high surface area while maintaining manufacturing feasibility and enabling superior heat flux compared to conventional particle catalysts.
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 configuration achieves higher methane conversion, lower pressure drop, and improved heat flux compared to conventional catalysts, allowing for efficient operation at high space velocities and reducing the risk of catalyst delamination and structural deformation.
Implementation Method 1
This unique geometry accelerates gas mixing and heat transfer
Implementation Method 2
Heat released from combustion reactions is transferred by radiation and convection to tubular reactor outer wall, then by conduction from the outer wall to the inner wall, and then by conduction and convection to the reaction mixture in the tubular reactor interior
Implementation Method 3
Catalytic steam reforming technology has been widely applied for synthesis gas production from hydrocarbon containing feedstock such as natural gas
Implementation Method 4
Since the steam reforming process is highly endothermic, external heating sources are required
Data Source
AI summary
The present invention relates to high efficient tubular catalytic steam reforming reactor configured from about 0.2 inch to about 2 inch inside diameter high temperature metal alloy tube or pipe and loaded with a plurality of rolled catalyst inserts comprising metallic monoliths. The catalyst insert substrate is formed from a single metal foil without a central supporting structure in the form of a spiral monolith. The single metal foil is treated to have 3-dimensional surface features that provide mechanical support and establish open gas channels between each of the rolled layers. This unique geometry accelerates gas mixing and heat transfer and provides a high catalytic active surface area. The small diameter, high aspect ratio tubular catalytic steam reforming reactors loaded with rolled catalyst inserts can be arranged in a multi-pass non-vertical parallel configuration thermally coupled with a heat source to carry out steam reforming of hydrocarbon-containing feeds. The rolled catalyst inserts are self-supported on the reactor wall and enable efficient heat transfer from the reactor wall to the reactor interior, and lower pressure drop than known particulate catalysts. The heat source can be oxygen transport membrane reactors.