Structured Catalyst Protrusion Clearance Design
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Solution Overview
Problem
In catalytic reactors with structured catalysts, firm fixation to the reaction-side flow channel due to material diffusion at high temperatures complicates catalyst removal, and the clearance required for easy insertion and removal reduces reaction efficiency by allowing uninteracted reaction fluid flow.
Innovation Solution
A catalytic reactor design featuring a structured catalyst with protrusions that create a controlled clearance between the catalyst and the flow channel, allowing easy insertion and removal while maintaining a sufficient contact area for efficient reaction, with the clearance ranging from 5% to 20% of the flow space height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a predetermined clearance is provided between the structured catalyst and the inner surface of the reaction-side flow channel to facilitate insertion and removal, then ease of operation is improved, but reaction efficiency deteriorates due to uninteracted reaction fluid flow
Solution Approach 1:
The structured catalyst is divided into multiple sections along the flow direction, with protrusions created at specific locations. This segmentation allows the catalyst to have both contact points for easy removal and minimal clearance for efficient reaction, resolving the contradiction between ease of operation and reaction efficiency
Solution Approach 2:
The clearance between the catalyst and flow channel is not uniform but is locally controlled through protrusions at specific positions. This creates different clearance characteristics at different locations: minimal clearance at protrusion points for reaction efficiency, and sufficient clearance at other points for ease of insertion and removal
2Reliability
If the structured catalyst is firmly fixed to the reaction-side flow channel through material diffusion at high temperatures, then reliability is improved, but ease of repair deteriorates due to difficulty in catalyst removal
Solution Approach 1:
The catalyst structure is segmented with protrusions that create localized contact points. These protrusions allow the catalyst to be firmly fixed during operation while providing specific points for tool engagement during removal, resolving the contradiction between fixation stability and removal ease
Solution Approach 2:
The protrusions act as intermediaries between the catalyst and the flow channel, providing controlled contact points that allow both firm fixation during operation and easy removal when needed. The protrusions mediate between the conflicting requirements of stability and removability
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
Facilitates easy removal of the structured catalyst and enhances reaction efficiency by minimizing friction and maintaining catalyst-reactant interaction without excessive clearance.
Implementation Method 1
The clearance reduces a friction between the reaction-side flow channel and the structured catalyst to facilitate the insertion and removal of the structured catalyst
Implementation Method 2
a firm fixation of the structured catalyst is promoted by mutual diffusions of materials of the reaction-side flow channel and the catalyst
Data Source
AI summary
A catalytic reactor includes: a reaction-side flow channel in which a reaction fluid flows; a structured catalyst removably located in the reaction-side flow channel; and a protrusion formed in the structured catalyst or an inner surface of the reaction-side flow channel, having a height forming a clearance between the structured catalyst and the inner surface of the reaction-side flow channel.