Screenless Reactor Overlapping Vanes Catalyst Retention
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Solution Overview
Problem
Corrosion of screens or meshes in radial flow reactors leads to plugging and catalyst loss, increasing maintenance and operational costs due to dead volumes and catalyst escape.
Innovation Solution
A moving bed reactor design featuring overlapping vanes within a reactor housing, allowing catalyst to cascade while gas flows counter-currently, eliminating the need for screens and preventing catalyst loss by ensuring continuous uniform contact and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screens or meshes are used to hold catalyst particles in place, then catalyst retention is improved, but corrosion and plugging occur leading to increased maintenance and catalyst loss
Solution Approach 1:
The patent removes the screen or mesh component entirely from the reactor system. Instead of using a screened surface to retain catalyst particles, the invention employs a moving bed configuration where catalyst particles are continuously circulated through the reactor without requiring physical barriers. This extraction of the problematic screen component eliminates corrosion and plugging issues while maintaining catalyst retention through the moving bed mechanism itself.
Solution Approach 2:
The patent transitions from a static screen-based retention system to a dynamic moving bed system. Catalyst particles are continuously moved through the reactor by controlled fluid flow, allowing them to be retained without physical screens. The dynamic circulation of the catalyst bed enables particle retention while avoiding the static screen structures that are prone to corrosion and plugging.
2Productivity
If screens are used to distribute pressure and facilitate radial flow, then flow distribution is improved, but corrosion creates dead volumes and plugging occurs
Solution Approach 1:
The patent eliminates the screen component that is responsible for both catalyst retention and pressure distribution. Instead of using screened surfaces, the invention employs direct fluid injection and moving bed circulation to achieve proper flow distribution. This removal of the screen component prevents corrosion-related downtime while maintaining effective pressure distribution through the moving bed mechanism.
Solution Approach 2:
The patent implements continuous circulation of the catalyst bed through the reactor, eliminating the need for periodic screen cleaning or replacement. The continuous moving bed system maintains consistent flow distribution without the interruptions caused by corrosion and plugging of static screens, thereby eliminating downtime for repairs.
3Reliability
If small apertures are used in screens to prevent catalyst passage, then catalyst retention is improved, but corrosion plugs apertures creating dead volumes
Solution Approach 1:
The patent removes the screen component with its small apertures entirely from the system. Instead of relying on screened surfaces with tiny openings to retain catalyst, the invention uses a moving bed configuration where catalyst particles are retained through continuous circulation and controlled fluid flow. This eliminates the aperture structure that is prone to corrosion and plugging, thereby reducing maintenance complexity.
Solution Approach 2:
The patent replaces the expensive, maintenance-intensive screen components with a simpler moving bed system. Rather than investing in corrosion-resistant screens with small apertures that still require maintenance, the invention uses a disposable-like approach where the catalyst bed itself is continuously circulated and refreshed, eliminating the need for expensive screen replacements and maintenance 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 design reduces downtime and catalyst loss by maintaining continuous flow of solids and gas, preventing backflow and plugging, and enhancing reactor performance in corrosive environments.
Implementation Method 1
allowing gas to flow across the catalyst when the gas flows counter current to the catalyst
Implementation Method 2
Solid catalyst particles are added at the top, and flow through the apparatus and removed at the bottom
Data Source
AI summary
A screenless reactor design is presented. The reactor includes a series of overlapping vanes where solid catalyst can cascade down the vanes. Gas flows across the catalyst by flowing through the vanes contacting the catalyst and then disengaging from contact with the solid catalyst particles.