Granule Loading in Vertical Reactor Tubes
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Solution Overview
Problem
Existing methods for loading granules into vertical multitube reactors often result in uneven loading densities and heights, leading to differential pressure and flow biases, which can cause decreased reaction yields, selectivity, and catalyst performance, while also risking granule damage and clogging.
Innovation Solution
A granule loading method that adjusts the outer diameter of a linear member with a small-diameter portion and a large-diameter portion, and sets a specific distance between the granule loaded layer and the linear member's lower end, to ensure even loading without using a funnel or with a funnel, preventing granule damage and clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If granules are loaded by dropping from above the reaction tube, then loading operation is simple, but granule damage occurs due to impact
Solution Approach 1:
A linear member (such as a string, chain, or rod) is inserted into the reaction tube to serve as an intermediary that catches and guides the granules during loading. This mediator reduces the impact velocity of falling granules by providing a gradual deceleration path along the tube length, thereby preventing granule damage while maintaining simple loading operation.
2Productivity
If granules are loaded by dropping from above, then loading process is fast, but uneven loading density and height occur
Solution Approach 1:
The linear member acts as a guiding intermediary that distributes granules evenly as they descend through the reaction tube. By providing a consistent surface or structure along the tube length, it ensures uniform granule placement and prevents localized accumulation, achieving both fast loading and uniform distribution.
Solution Approach 2:
The linear member creates a consistent reference surface throughout the reaction tube length, establishing equipotential conditions for granule placement. This ensures that granules settle at uniform heights and densities along the entire tube, eliminating variations in loading uniformity while maintaining efficient loading speed.
3Strength
If string-like member is inserted to reduce dropping velocity, then granule damage is prevented, but clogging may occur
Solution Approach 1:
The linear member's parameters (diameter, length, material properties) are optimized to balance two functions: reducing granule impact velocity to prevent damage while maintaining sufficient gap space to allow smooth granule flow. By carefully selecting these parameters, both granule protection and clogging prevention are achieved simultaneously.
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 method allows for smooth and even loading of granules into reaction tubes, maintaining equal heights and densities, preventing granule damage and clogging, and ensuring consistent reaction results across all tubes.
Implementation Method 1
Those methods utilize an effect that a dropping velocity of the granules is reduced because the dropping granules contact the string-like member or the like inserted in the reaction tube
Implementation Method 2
the loading of the granules into the reaction tube has been performed by putting the granules into the reaction tube installed in a vertical direction from above the reaction tube and causing the granules to drop by gravity
Data Source
AI summary
A method may load granules into reaction tubes of a vertical multitube reactor installed vertically by dropping the granules from above each of the reaction tubes whereby a linear member is inserted and suspended in the reaction tube. The reaction tube has an effective length of ≥1000 mm. The linear member includes a small-diameter portion positioned on an upper side and large-diameter portion continuously extending from the small-diameter portion. The small-diameter portion has an outer diameter (Ra) of ≤5.0 mm, and the large-diameter portion has an outer diameter (Rb) of 5.0 to 15.0 mm larger than Ra. A length of the small-diameter portion from reaction tube's upper end is 10.0 mm or more. A distance between an upper surface of a granule loaded layer formed inside the reaction tube and a lower end of the linear member inserted in the reaction tube is ≥100 mm.