Reformer Inlet Plenum Catalyst Mesh for Hydrocarbon Conversion
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Solution Overview
Problem
Existing fuel cell reformers face challenges in achieving high efficiency and compactness, particularly in utilizing hydrocarbon gases like natural gas, ethane, propane, or liquefied petroleum gas, as they require improvements in catalyst placement and heat utilization to enhance hydrogen production for wider fuel cell applications.
Innovation Solution
A reformer design featuring a housing with an inlet plenum containing a mesh container holding a pre-reformer catalyst, such as nickel, where the source fluid is exposed to the catalyst before entering the reforming section, optimizing the exposure path through coaxial inner and outer mesh walls to enhance reaction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the reformer is made compact to include as part of a fuel cell power plant, then the device size is reduced, but the efficiency of hydrocarbon conversion and heat utilization deteriorates
Solution Approach 1:
The catalyst is placed in the inlet plenum to perform preliminary reforming of hydrocarbons before the main reforming section. This preliminary action allows partial conversion of hydrocarbons to occur in the inlet region, utilizing the space that would otherwise be idle and improving overall conversion efficiency without increasing the total reformer volume.
Solution Approach 2:
The catalyst is arranged in a mesh structure with coaxial inner and outer walls, creating a three-dimensional catalytic zone within the inlet plenum. This spatial arrangement maximizes the catalyst surface area exposed to the hydrocarbon stream, enhancing reaction efficiency within a compact volume.
2Productivity
If the catalyst is placed in the inlet plenum with extended exposure path, then the conversion efficiency is improved, but the device complexity increases
Solution Approach 1:
The catalyst is contained within a mesh structure comprising coaxial inner and outer walls with interconnected openings. This porous-like mesh configuration allows the hydrocarbon stream to pass through and contact the catalyst extensively, providing extended exposure path and high conversion efficiency while maintaining a relatively simple structural form.
Solution Approach 2:
The mesh container is positioned within the inlet plenum space, nesting the catalyst containment structure within the existing reformer geometry. This nested arrangement utilizes available space efficiently and integrates the catalyst support structure into the overall reformer design without adding significant external complexity.
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 design increases the reformer's efficiency by effectively utilizing waste heat and improving the conversion of hydrocarbon gases into hydrogen, making fuel cell systems more economical and suitable for diverse applications.
Implementation Method 1
The inlet plenum includes a catalyst situated where a source fluid passing through the inlet plenum will be exposed to the catalyst prior to entering the reforming section
Data Source
AI summary
An illustrative example reformer includes a housing having an inlet plenum, a reforming section, and an outlet. The inlet plenum includes a catalyst situated where a source fluid passing through the inlet plenum will be exposed to the catalyst prior to entering the reforming section.