Heat Exchanger Support Structure for Thermal Expansion Management
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Solution Overview
Problem
Heat exchange devices in gasification processes face challenges due to differences in thermal expansion, leading to high mechanical stress loads and unreliable support structures, particularly in reactors where syngas is cooled from high temperatures.
Innovation Solution
A robust support structure with embedded parallel inner channels evenly distributed and arranged to equalize thermal expansion, allowing the heat exchange surfaces to rest on or hang from the structure, connected via welding joints, and comprising sections with meandering channels to reduce mechanical stress, with optional tubular parts and blocks for enhanced strength and cleaning capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sliding bearings are used to allow freedom of movement due to thermal expansion, then the support structure can accommodate thermal expansion, but the bearings are difficult to realize and less reliable under reactor conditions
Solution Approach 1:
The patent replaces the mechanical sliding bearing system with a direct rigid support structure where heat exchange surfaces are carried by support structures that are fixed to the reactor wall. This eliminates the need for sliding bearings while accommodating thermal expansion through the inherent flexibility of the support structure design and the natural expansion characteristics of the rigid components themselves.
2Strength
If nested heat exchange surfaces are carried by a support structure, then the heat exchange surfaces are supported, but high local stress peaks are induced
Solution Approach 1:
The support structure is divided into multiple discrete support points distributed along the reactor wall rather than concentrating support at single locations. Each support point carries a portion of the heat exchange surface weight and accommodates local thermal expansion independently, distributing the mechanical loads and reducing peak stress concentrations.
Solution Approach 2:
The support structure is designed to be dynamically flexible, allowing controlled movement and deformation in response to thermal expansion forces. The support structures can deflect and adjust their position slightly under thermal load, converting static rigid support into a more dynamic system that absorbs thermal stress through controlled deformation rather than resisting it rigidly.
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 solution effectively reduces mechanical stress induced by thermal expansion differences and allows for efficient cleaning of heat exchange surfaces, ensuring reliable operation and effective heat dissipation in high-temperature reactors.
Implementation Method 1
heat exchange surfaces disposed in the channel... for cooling a gas... The hot syngas is quenched to temperatures between 100-700 °C
Implementation Method 2
Differences in thermal expansion of the various parts complicate possible support constructions... To equalize thermal expansion, the inner channels are preferably evenly distributed and equidistantly arranged
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A heat exchange device (1), e.g., for a syngas reactor, comprising a channel wall (3) defining a flow channel and one or more heat exchange surfaces (5a- d), each embedding one or more flow paths for a fluid heat exchange medium. A support structure (20) supports the heat exchange surfaces (5a - d) within the flow channel. The support structure (20) comprises a plurality of arms (21) extending from a central crossing (22) to the channel wall (3). The arms (21) of the support structure can embed evenly distributed, e.g., meandering inner channels (23) which can be in open connection with the flow paths in the heat exchange surfaces (5a - d).