Helical Flow Path in Expanded Toroidal Bed Reactor
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Solution Overview
Problem
Existing methods for processing particulate materials in turbulent beds often result in non-uniform particle treatment and gas/solid mixing due to unpredictable particle flow paths, which can lead to inefficiencies and undesirable outcomes such as ash sintering during combustion.
Innovation Solution
A method and apparatus that introduce a fluid flow into a processing zone at specific angles (between 10° and 75° with respect to the tangent and 5° to 45° with respect to the horizontal plane) to establish a helical flow path, ensuring uniform particle distribution and controlled mixing by using vanes or deflectors to direct the fluid flow and maintain a circumferentially circulating turbulent bed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a gaseous stream is used to fluidise the bed of particulate material, then treatment efficiency is improved, but particle flow path becomes unpredictable leading to non-uniform treatment
Solution Approach 1:
The gas distributor is divided into multiple nozzles arranged in a specific pattern, with each nozzle directing gas flow at a specific angle (10°-75°) relative to the tangent of the processing zone. This segmentation of the gas distribution system creates multiple controlled helical flow paths that collectively ensure uniform particle treatment while maintaining high treatment efficiency.
Solution Approach 2:
Different regions of the gas distributor are designed with nozzles oriented at different angles and positions to create localized flow patterns. The nozzles are positioned to direct gas flow into the processing zone at optimized angles, creating locally controlled helical circulation that ensures each region of the particle bed receives uniform treatment.
2Quantity of substance
If turbulent bed circulation is established, then gas/solid mixing is enhanced, but particle flow path becomes unpredictable
Solution Approach 1:
The gas flow is directed at angles relative to the tangent of the processing zone, introducing a helical dimension to the flow pattern. This transforms the traditional two-dimensional radial flow into a three-dimensional helical circulation, where particles follow predictable spiral paths both circumferentially and vertically, enhancing mixing while maintaining flow path predictability.
Solution Approach 2:
The processing zone is designed with a substantially circular transverse cross-section, and the gas flow is introduced at angles relative to the tangent of this circular geometry. This curved, helical flow path follows the natural geometry of the processing zone, creating smooth circumferential circulation that enhances mixing while maintaining predictable particle trajectories.
3Speed
If high velocity gas flow is used to entrain particulate material, then treatment rate is improved, but non-uniform mixing occurs
Solution Approach 1:
The gas flow is divided into multiple streams from multiple nozzles distributed around the processing zone. Each nozzle delivers high velocity gas at optimized angles, and the combined effect of these segmented high-velocity streams creates uniform helical circulation that maintains both high treatment rates and uniform mixing throughout the particle bed.
Solution Approach 2:
The angle of gas flow introduction is optimized to be between 10°-75° relative to the tangent of the processing zone. This parameter optimization ensures that high velocity gas flow enters the processing zone at angles that promote helical circulation and uniform mixing, preventing localized turbulence while maintaining high treatment rates.
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
This approach provides a predictable particle flow path both circumferentially and helically, ensuring uniform treatment and maximizing gas/solid mixing, preventing issues like ash sintering and allowing for controlled reactions by maintaining particulate material in a suspended, aggregated state without incipient fluidization.
Implementation Method 1
providing a flow of fluid into said chamber for entraining the particulate material
Implementation Method 2
the fluid flow being introduced into the processing zone at an angle of between 10° and 75° with respect to a tangent of the substantially circular transverse cross-section of the processing zone to establish a fluid flow following a substantially helical path in the processing zone
Implementation Method 3
maintain a circumferentially circulating turbulent bed
Implementation Method 4
maintaining particulate material in a suspended, aggregated state without incipient fluidization
Data Source
AI summary
A method of processing a fluid and/or a particulate material, the method comprising the steps of: (a) introducing the particulate material into a chamber; (b) providing a flow of fluid into said chamber for entraining the particulate material; and (c) removing processed fluid and/or particulate material from the chamber; wherein the chamber comprises a processing zone having a substantially circular transverse cross-section, the fluid flow being introduced into the processing zone at an angle of between 10° and 75° with respect to a tangent of the substantially circular transverse cross-section of the processing zone to establish a fluid flow following a substantially helical path in the processing chamber.