Dispersion Plate Concentric Spout Nozzle Layout for Uniform Particle Coating
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Solution Overview
Problem
Existing dispersion plates in fluidized bed coating devices face challenges in maintaining smooth particle coating performance when scaled up, leading to particle flow dead zones and uneven coating due to suboptimal spout nozzle arrangements.
Innovation Solution
A dispersion plate design with a concentric circle arrangement of spout nozzles, where the density of gas injection holes is higher in spout nozzles, and the number and angle of nozzles are optimized to ensure uniform particle flow and prevent interference, accompanied by wind box structures to guide gas flow uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dispersion plate is linearly scaled up, then the device size increases, but the pitch of gas injection holes is widened causing particle flow dead zones and particle falling-out
Solution Approach 1:
The patent applies local quality by creating spout nozzle regions with higher gas injection hole density compared to other regions. This localized increase in hole density ensures smooth particle flow in critical spout areas while maintaining overall device scaling. The spout nozzle regions are specifically designed with denser hole distribution to prevent particle flow dead zones and falling-out, resolving the contradiction between device size increase and particle flow smoothness.
2Device complexity
If spout nozzles are arranged loosely to facilitate device scaling, then device complexity decreases, but particle coating regions interfere with each other causing uneven coating
Solution Approach 1:
The patent segments the dispersion plate into multiple spout nozzle regions distributed across concentric circles. Each region is independently optimized with specific hole densities and nozzle arrangements. This segmentation allows each spout nozzle region to operate independently without interfering with others, achieving uniform coating while maintaining manageable device complexity through modular regional design.
Solution Approach 2:
The patent transitions from simple linear or grid-based nozzle arrangement to a two-dimensional concentric circular distribution pattern. By organizing spout nozzles along multiple concentric circles with varying radial distances and angular positions, the design achieves optimal spatial distribution that prevents coating interference while maintaining scalability. This dimensional reorganization resolves the contradiction between arrangement simplicity and coating uniformity.
3Productivity
If the number of spout nozzles is increased to improve coating coverage, then productivity increases, but the arrangement becomes more complex making it difficult to maintain smooth particle flow
Solution Approach 1:
The patent employs concentric circular arrangement of spout nozzles distributed across multiple radial levels. This two-dimensional pattern allows systematic increase of nozzle number while maintaining regular spacing and predictable geometry. The concentric structure provides a natural framework for organizing numerous nozzles without increasing complexity, as each nozzle position is determined by simple radial and angular parameters rather than complex individual positioning.
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
Ensures smooth particle coating performance even in scale-up devices by preventing flow dead zones and agglomeration, enhancing coating efficiency and uniformity.
Implementation Method 1
The dispersion plate is perforated with gas injection holes to prevent particle retention
Implementation Method 2
the coating of the particles is performed by a polymer droplet injection nozzle located therein
Implementation Method 3
The coated particles are ejected to the top of the bed and then dried while descending
Data Source
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AI summary
The present invention relates to a dispersion plate and a coating device comprising the same, which provides a dispersion plate comprising a plurality of gas injection holes, wherein the dispersion plate includes a plurality of spout nozzles formed by a dense arrangement of the gas injection holes, wherein one spout nozzle is disposed at the center of the dispersion plate and the plurality of spout nozzles are arranged along a plurality of virtual concentric circles from the center of the dispersion plate to the edge of the dispersion plate, where with respect to two adjacent virtual concentric circles, the number of spout nozzles arranged along an outer concentric circle based on the center of the dispersion plate is twice the number of spout nozzles arranged along an inner concentric circle and the arrangement interval of the spout nozzles arranged along the outer concentric circle is half the arrangement interval of the spout nozzles arranged along the inner concentric circle.