Multi-Layered Fluid Distributor for High-Temperature Gravity Conveyors
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Solution Overview
Problem
Conventional fluidizing gravity conveyors are not suitable for high-temperature applications as they either ignite or erode when exposed to high temperatures, and their designs can cause material clumping and obstruction due to protruding tubes or bubble caps, which are not optimal for certain materials.
Innovation Solution
A multi-layered fluid distributor with a smooth, gas-permeable upper surface made from high-temperature resistant materials, including a porous medium for gas passage, insulation to reduce temperature gradients, and a perforated support layer for air distribution, allowing operation up to 2900°F and preventing material clumping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tightly woven aeration fabric with closely controlled air porosity is used as the gas permeable member, then uniform gas distribution is achieved, but the fabric cannot withstand high temperatures and may ignite
Solution Approach 1:
The patent applies composite materials by combining multiple layers with distinct functions: a heat-resistant porous ceramic layer (with 30-70% porosity) that withstands high temperatures up to 2900°F, an insulation layer (such as ceramic fiber blanket) to reduce thermal gradients, and a support layer with embedded gas distribution channels. This composite structure resolves the contradiction by providing both the gas distribution uniformity of engineered porous materials and the temperature resistance of refractory ceramics.
Solution Approach 2:
The distributor member is segmented into multiple functional layers: (1) a top porous ceramic layer for gas permeability and heat resistance, (2) an intermediate insulation layer to protect underlying structures from thermal shock, and (3) a bottom support layer with integrated gas distribution manifolds. This segmentation allows each layer to be optimized for its specific function while collectively solving the temperature-resistance versus gas-distribution uniformity contradiction.
2Reliability
If high temperature insulation material is used as the porous material, then temperature resistance is improved, but the material erodes away when exposed to flowing material
Solution Approach 1:
The patent applies local quality by assigning different material properties to different locations and functions within the distributor assembly. The top surface layer uses hard, erosion-resistant porous ceramic material that directly contacts the flowing material, while lower layers use softer insulation materials for thermal protection. This localized material selection resolves the contradiction between temperature resistance and erosion resistance by giving each layer the properties it needs for its specific role.
3Ease of operation
If protruding tubes or bubble caps are used for air distribution, then gas distribution is achieved, but material clumping and obstructions occur
Solution Approach 1:
The patent extracts the gas distribution function from protruding elements (tubes or bubble caps) and integrates it into the planar structure of the distributor member itself. Gas distribution channels are embedded within the flat ceramic plate, allowing uniform gas emergence across the entire surface without any protruding elements. This eliminates the source of material clumping and obstructions while maintaining effective gas distribution.
Solution Approach 2:
The patent uses a porous ceramic plate as the gas distribution medium, where gas passes through the porous matrix of the ceramic material itself rather than through discrete tubes or caps. The porous structure provides numerous distributed gas emergence points across the entire surface area, achieving effective gas distribution without protruding elements that would cause material clumping and flow obstructions.
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 multi-layered design enables efficient and safe conveyance of high-temperature materials by maintaining a smooth surface, reducing the risk of blockages, and ensuring even fluidization, thus enhancing conveyor capacity and material flow velocity while withstanding extreme temperatures.
Implementation Method 1
a porous medium capable of withstanding the high temperature in the material chamber and which further provides many small holes through which fluidizing gas will pass
Implementation Method 2
insulation to reduce temperature gradients
Implementation Method 3
Material supported on the gas permeable member in the material chamber is aerated and fluidized by the gas under pressure. When fluidized, the material will flow downwardly from the inlet to the outlet by gravity
Data Source
AI summary
An apparatus for conveying fluidized high temperature finely divided dry material by gravity utilizes a multi-layered, gas permeable gas distributor member comprising (i) an upper layer a flat, rigid gas permeable, porous medium capable of withstanding temperatures up to about 2900° F. through which gas to fluidize the material will pass; (ii) a middle layer comprised of a gas permeable insulation material that maintains its physical integrity when exposed to temperature differentials ranging from about 500° F. to about 2900° F.; and (iii) a lower layer that supports the top and middle layers comprising a substantially flat plate having a plurality of openings therethrough through which fluidizing gas can pass.