Modular Radial Bed Reactor for High HSV Catalyst Reforming
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Solution Overview
Problem
Radial bed reactors face limitations in catalyst volume due to constraints such as avoiding cavitation, pinning, and pressure drops, resulting in maximum Space-Time Yields (HSV) of around 20 h−1, which hinders efficient catalytic reforming processes.
Innovation Solution
A modular radial bed reactor design with a single shell housing identical modules, allowing for a small quantity of catalyst and enabling higher HSVs by optimizing the flow of feed and catalyst under gravity, with permeable screens and a central collector for efficient gas exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gas flow speed through the catalytic bed is increased to improve productivity, then the HSV increases, but cavitation occurs at the entrance to the bed and pressure drops increase
Solution Approach 1:
The reactor is divided into multiple segments with screens at strategic positions. The screen at the bed entrance segments the flow to distribute gas uniformly, preventing cavitation. Additional screens segment the bed into zones, allowing pressure management across different sections while maintaining high overall gas flow speeds for improved HSV.
Solution Approach 2:
Screens are introduced as intermediary elements between the gas flow and catalyst bed. These screens mediate the interaction by distributing flow evenly, preventing direct high-speed impingement that causes cavitation, while still allowing gas to pass through to reach the catalyst for high productivity operation.
2Productivity
If the gas flow speed is increased to achieve higher HSV, then productivity improves, but the catalyst jams against the inner screen (pinning)
Solution Approach 1:
A screen is positioned at the bed exit as an intermediary element between the catalyst and the central collector. This screen prevents catalyst particles from directly contacting and jamming against the inner screen during high-velocity operation, allowing maintained high gas flow speeds for improved HSV without catalyst pinning issues.
Solution Approach 2:
The exit screen is positioned beforehand to cushion or buffer the catalyst flow before it reaches the central collector. This preemptive measure prevents catalyst particles from accumulating and jamming at the collector entrance, enabling sustained high-speed operation for high productivity.
3Quantity of substance
If the space between inner screen and outer screen is reduced to minimize catalyst volume, then device complexity decreases, but sufficient space is needed for construction and operation
Solution Approach 1:
The catalytic bed is segmented into multiple zones using screens positioned at optimal intervals. This segmentation allows the bed thickness to be optimized in each zone, minimizing total catalyst volume while maintaining adequate construction and operational space within each segment. The modular segmented structure enables efficient use of space for both catalyst and mechanical operations.
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 modular design achieves HSVs of over 50 h−1, optimizing reaction performance while maintaining a realistic, flexible, and easy-to-maintain mechanical structure, enhancing catalyst activity and aromatics production in gasoline reforming processes.
Implementation Method 1
a transverse flow of feed... orthogonal to the movement of the catalyst which moves under gravity
Implementation Method 2
the outer (2) and inner (5) walls of each module being permeable to the gaseous feed and to gaseous effluents
Data Source
AI summary
The present invention describes a type of radial bed reactor which can allow a small quantity of catalyst to be used. Application to a regenerative reforming process reactor.