Fluidized Bed Injection Grid with Variable Inlet Holes
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Solution Overview
Problem
Existing fluidized bed technologies face issues with uneven flow of the fluidizing medium due to sloped injection grids and varying fluid heads above inlet holes, leading to inefficient fluid distribution.
Innovation Solution
A fluidized bed apparatus and method utilizing an injection grid with inlet holes of varying diameters or cross-sectional areas to ensure uniform fluid distribution, with the cross-sectional area adjusted based on the fluid head above each hole to maintain equal pressure drop and control flow patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a uniform injection grid with identical inlet holes is used, then the device complexity is reduced, but uneven flow distribution occurs due to varying fluid heads above different inlet holes
Solution Approach 1:
The invention applies local quality by making each inlet hole have a different cross-sectional area tailored to its specific fluid head condition. Holes with higher fluid heads have larger cross-sectional areas, while holes with lower fluid heads have smaller cross-sectional areas, ensuring uniform flow distribution across the injection grid.
Solution Approach 2:
The invention changes the geometric parameter (cross-sectional area) of the inlet holes based on their position and fluid head conditions. By varying the cross-sectional area parameter across different holes, the system compensates for fluid head variations and achieves uniform flow distribution.
2Manufacturing precision
If inlet holes with different cross-sectional areas are used, then uniform fluid distribution is achieved, but the device complexity increases
Solution Approach 1:
Each inlet hole is designed with a specific cross-sectional area matched to its local fluid head conditions, creating a non-uniform but optimized structure that ensures uniform flow distribution across the entire injection grid.
3Manufacturing precision
If the injection grid is sloped to accommodate varying fluid heads, then flow distribution improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of sloping the entire injection grid, the invention applies local quality by individually sizing each hole based on its specific fluid head conditions, maintaining a flat grid structure while achieving uniform flow distribution.
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 solution ensures consistent and controlled fluidization of particles, enhancing the efficiency of processes like coal or carbonaceous material gasification by maintaining uniform flow patterns and pressure drops across the fluidized bed.
Implementation Method 1
When the drag force of flowing fluid exceeds gravity, particles are lifted and fluidization occurs
Implementation Method 2
A constriction is provided having a fixed opening defining a venturi of fixed throat size to provide a uniform upward gas velocity into the vessel
Implementation Method 3
Fluidization is commonly defined as an operation by which particulate fine solids are transformed into a fluid-like state through contact with a gas or liquid
Data Source
AI summary
A fluidized bed apparatus having a plurality of inlet holes for the introduction of fluidizing medium into a fluidized bed, wherein at least two, and preferably more, of the inlet holes have different cross sectional areas.