Gas Disperser Flow Conditioning for Uniform Spray Drying
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Solution Overview
Problem
Existing spray drying apparatuses require complex and bulky upstream ducting and gas disperser designs to achieve uniform drying gas flow, leading to inefficiencies and high costs.
Innovation Solution
A combination of an upstream hole plate with downstream flow straightener is used to condition the gas flow, enhancing axial flow uniformity while reducing in-plane velocities, with a simple and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex upstream ducting construction is used to align gas stream, then flow uniformity is improved, but device complexity and bulkiness increase
Solution Approach 1:
The flow conditioning device is segmented into multiple functional components: a honeycomb structure for flow alignment, followed by a perforated plate for flow distribution. This segmentation allows each component to perform its specific function efficiently, achieving uniform flow without requiring complex upstream ducting constructions.
Solution Approach 2:
The invention extracts the essential flow conditioning function from the complex upstream ducting system and concentrates it into a compact flow conditioning device located at the inlet of the drying chamber. This eliminates the need for elaborate vertical ducts, bends, and elbows while maintaining flow uniformity.
2Manufacturing precision
If multiple guide vanes are used in gas disperser design, then flow distribution is improved, but device complexity increases
Solution Approach 1:
Instead of using multiple guide vanes throughout the disperser, the invention applies local quality by placing a honeycomb structure specifically at the inlet region where flow alignment is most needed, followed by a perforated plate at the discharge point for uniform distribution. This localized approach achieves flow uniformity with simpler overall design.
Solution Approach 2:
The invention uses a perforated plate with multiple small holes as a porous-like structure to distribute flow uniformly. This alternative to solid guide vanes achieves better flow distribution while reducing mechanical complexity and facilitating easier manufacturing and cleaning.
3Manufacturing precision
If elaborate ducting is used to condition gas flow, then drying uniformity is improved, but production capacity decreases
Solution Approach 1:
The invention merges the flow alignment and flow distribution functions into a single integrated flow conditioning device located at the chamber inlet. This combination eliminates the need for separate elaborate ducting sections, reducing space requirements and maintaining high production capacity while achieving uniform drying conditions.
Solution Approach 2:
Instead of using long upstream ducting in the axial direction to condition flow, the invention transitions to a different dimensional approach by using a compact flow conditioning device with specific geometric structures (honeycomb and perforated plate) that condition flow in a localized region, thereby preserving production capacity.
4Device complexity
If simple flow conditioning device is used, then device complexity is reduced, but flow uniformity deteriorates
Solution Approach 1:
The honeycomb structure uses an asymmetric hexagonal geometry that is highly effective at aligning flow with minimal material. This asymmetric shape provides superior flow conditioning performance compared to simpler symmetric designs, achieving flow uniformity without increasing overall device complexity.
Solution Approach 2:
The flow conditioning device performs preliminary flow conditioning at the inlet stage, preparing the gas flow before it enters the main drying chamber. The honeycomb structure pre-aligns the flow, and the perforated plate further distributes it, ensuring uniform conditions are established early in the process.
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 provides efficient and uniform gas flow with reduced complexity and cost, facilitating easy manufacturing and cleaning, and maintaining high production capacity and product quality.
Implementation Method 1
Each hole plate is provided a plurality of holes distributed over substantially the entire cross-sectional area of the hole plate
Implementation Method 2
a flow straightener provided with a plurality of flow channels, each having a longitudinal extension in parallel with the axial direction
Data Source
Figure 1
Figure 2a~2s
Figure 3~4
AI summary
In the gas disperser (3), a flow conditioning device (5, 6) is located in the inlet duct section (32). The flow conditioning device comprises a hole plate (5) and a flow straightener (6) positioned in parallel with and at a distance (h) in the axial direction (axd) from the downstream side of the hole plate (5). The hole plate (5) has a predefined hole plate thickness (tp) in the axial direction (axd) and each flow straightener (6) has a predefined flow straightener length (Is) in the axial direction (axd), the flow straightener length (Is) being substantially larger than the hole plate thickness (tp).