Compact Steam Boiler with Twisted Ribbons for Reformer
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Solution Overview
Problem
The challenge is to create a compact steam boiler for a steam reformer that maintains efficiency while accommodating reduced packaging constraints, as the size of steam reformers decreases due to space limitations.
Innovation Solution
A compact steam boiler design featuring an outer shell with two inner tubes spaced apart by thin wires and a twisted ribbon inside each tube, enhancing heat transfer by increasing surface area and mixing fluids, allowing steam to form over a shorter distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the steam boiler is reduced to meet packaging constraints, then the overall size of the steam reformer is reduced, but the heat transfer efficiency decreases
Solution Approach 1:
The patent transitions from a single inner tube configuration to multiple inner tubes arranged in a bundled configuration within the outer shell. This dimensional change increases the heat transfer surface area within the same volume, allowing compact size while maintaining heat transfer efficiency. The multiple tubes provide parallel heat transfer pathways, effectively increasing the active surface area without proportionally increasing the boiler volume.
Solution Approach 2:
The steam boiler is segmented into multiple inner tubes rather than using a single large tube. This segmentation allows the heat transfer function to be distributed across multiple smaller surfaces, increasing the total surface area available for heat exchange between the combustion gases and the water/steam. The segmented tube bundle configuration maximizes surface area within the constrained volume.
2Loss of energy
If the surface area for heat transfer is increased, then heat transfer efficiency is improved, but the device complexity increases
Solution Approach 1:
Multiple inner tubes are merged into a single bundled assembly that functions as an integrated heat transfer unit. The tubes are positioned closely together and supported by common structural elements (such as tube sheets or support ribs), creating a unified component assembly. This merging approach increases surface area while minimizing the additional complexity by treating the tube bundle as a single functional unit rather than separate components.
Solution Approach 2:
The outer shell serves multiple functions: it contains the combustion chamber, provides structural support for the tube bundle, and acts as a pressure boundary. The inner tubes simultaneously serve as heat transfer surfaces and as flow channels for water/steam. This multi-functionality reduces the need for additional specialized components, thereby limiting complexity growth despite the increased surface area.
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 results in a more compact steam boiler that maintains or increases efficiency, effectively reducing the size of the steam reformer while meeting packaging constraints.
Implementation Method 1
the twisted ribbon positioned inside each of the first and second inner tubes facilitates mixing of the water as it flows through the first and second inner tubes
Implementation Method 2
a surface area between the two fluids may be increased such that heat transfer to the water is increased
Data Source
AI summary
Embodiments are disclosed that relate to a compact steam boiler which may provide steam to a steam reformer in a fuel cell system. For example, one disclosed embodiment provides a steam boiler including an outer shell and a first inner tube and a second inner tube within the outer shell, the first and second inner tubes spaced away from one another. The steam boiler further includes a twisted ribbon positioned inside each of the first and second inner tubes.