Fluidised Bed Treatment Boundary Containment Surface
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Solution Overview
Problem
Existing methods for local heat treatment of components in fluidised beds face challenges such as poor repeatability due to the uneven surface of the fluidised media, limitations in component orientation and shape, and difficulties in applying differential heat treatment to large components.
Innovation Solution
The use of a boundary containment surface to define the treatment area within the fluidised bed, allowing for precise control of the treatment zone and accommodating non-planar shapes, along with adjustable components and interchangeable seal members to adapt to different shapes and sizes, enables improved repeatability and flexibility in treating various components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the component is partially submerged in the fluidised bed to achieve localised heat treatment, then the heat treatment can be applied to specific areas, but the uneven surface of the fluidised media causes poor repeatability
Solution Approach 1:
A boundary containment surface (such as a seal member or baffle) is introduced as an intermediary element between the fluidised bed media and the component. This mediator creates a controlled boundary that defines the treatment zone, ensuring consistent media contact with the component surface while eliminating the repeatability issues caused by the naturally uneven fluidised bed surface.
2Manufacturing precision
If the entire component is submerged in the fluidised bed, then uniform heat treatment is achieved, but differential heat treatment of different parts cannot be accomplished
Solution Approach 1:
The boundary containment surface is configured to create localized treatment zones, allowing different regions of the component to receive different heat treatment conditions. The containment surface can be positioned and shaped to expose specific areas of the component to the fluidised bed media while protecting other areas, enabling differential heat treatment of various component parts.
3Area of stationary object
If large components are treated in the fluidised bed, then complete coverage is achieved, but the treatment chamber becomes excessively large and complex
Solution Approach 1:
The treatment process is segmented into controlled zones using boundary containment surfaces. Instead of requiring a single large treatment chamber to accommodate the entire component, the containment surfaces divide the fluidised bed into manageable sections, allowing selective treatment of specific component areas. This segmentation enables treatment of large components using a more compact and manageable chamber size.
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 enhances the repeatability and flexibility of the heat treatment process, allowing for uniform and localized heat application to components of different shapes and sizes without the need for large treatment chambers, and enables efficient treatment of large components by controlling the media flow and temperature distribution.
Implementation Method 1
Fluidised beds also provide very good thermal transfer between the walls of the fluidised bed apparatus, the fluidising gas, the media and any component located in the media. This is due to the high surface area contact between the fluidising gas and the solid media and due to the very frequent particle-particle, particle-wall and particle-component collisions.
Implementation Method 2
Fluidised beds also provide very good thermal transfer between the walls of the fluidised bed apparatus, the fluidising gas, the media and any component located in the media.
Implementation Method 3
The distributor plate has an arrangement of many gas flow passages through it. Introduction of a process gas into the plenum chamber creates a pressure drop across the distributor plate. The resultant flow of process gas into the bed of media causes fluidisation.
Implementation Method 4
Introduction of a process gas into the plenum chamber creates a pressure drop across the distributor plate.
Data Source
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AI summary
A component is treated in a fluidised bed by insertion of only a treatment part of the component into the treatment chamber of a fluidised bed apparatus. The non-treatment part of the component is located substantially outside the treatment chamber and out of contact with the fluidised bed. The boundary between the treatment part and the non-treatment part of the component is defined by a boundary containment surface at a fixed location with respect to the component. The boundary containment surface may be a seal which seals between the component to be treated and an aperture in a side wall of the treatment chamber.