Conical Nozzle Box for Uniform Drying Air Distribution
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Solution Overview
Problem
Existing drying systems face inefficiencies in energy usage and uneven drying due to high fan power consumption and temperature variations across the width of drying materials, particularly in impingement jet ventilation systems.
Innovation Solution
The nozzle box design reduces the ratio of nozzle openings per square meter, increasing air outlet speed and pressure loss to enhance air distribution while maintaining power consumption at state-of-the-art levels, with features like conical shape, multiple nozzle rows, and radiation plates to focus heat evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ratio of nozzle openings per square meter is increased to improve air distribution, then drying uniformity improves, but fan power consumption increases
Solution Approach 1:
The patent reduces the nozzle opening ratio from conventional values (typically 1.5-2.0% or higher) to a specific range of 0.5-1.5%, particularly 0.8-1.2%. This parameter change optimizes the balance between air distribution effectiveness and energy consumption, achieving uniform drying with lower fan power requirements.
Solution Approach 2:
The nozzle box is designed with a conical shape, where the cross-section decreases in the flow direction. This curved geometry naturally guides the air flow more effectively toward the drying material, improving air distribution uniformity without requiring excessive nozzle openings or higher fan power.
2Productivity
If air outlet speed is increased to intensify drying, then drying efficiency improves, but pressure loss increases
Solution Approach 1:
The conical nozzle box shape creates a gradual pressure gradient that accelerates air flow efficiently. The curved walls guide the air smoothly, reducing turbulence and unnecessary pressure losses while maintaining high outlet speeds for intensive drying.
Solution Approach 2:
By optimizing the nozzle opening ratio to 0.5-1.5%, the system achieves an optimal balance where sufficient air outlet speed (3-6 m/s) is maintained for intensive drying while pressure loss is kept within acceptable limits for energy-efficient operation.
3Productivity
If conventional nozzle box design is used with high fan power, then drying intensity is sufficient, but energy consumption is high
Solution Approach 1:
The conical geometry of the nozzle box improves air flow guidance and distribution efficiency, allowing the system to achieve the same or better drying intensity with lower fan power consumption compared to conventional cylindrical or rectangular nozzle boxes.
Solution Approach 2:
The optimized nozzle opening ratio (0.5-1.5%) combined with the conical shape creates a more efficient air distribution system that maintains high drying intensity while reducing the energy required to drive the air flow through the drying chamber.
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 design achieves more intensive and even drying with reduced energy usage, improved air distribution, and lower maintenance effort, resulting in more efficient drying of panel-shaped materials like plasterboards.
Implementation Method 1
the drying air is brought in from the side of the drying system in nozzle boxes, also known as drying chambers, and blown perpendicularly onto the surface of the drying material via air outlet nozzles
Implementation Method 2
which has a conical shape in at least one direction perpendicular to the direction of flow of the drying air in the nozzle box
Implementation Method 3
The drying of board-like materials such as gypsum boards is preferably carried out by predominantly convective heat transfer in the form of heated air flowing over them
Data Source
Figure 1~4
Figure 2~3
AI summary
The invention relates to a nozzle box (7, 7') arranged in a drying device transversely to a plate (8) to be dried in the drying device by means of drying air. The nozzle box (7, 7') has a conical shape at least in a direction perpendicular to the flow direction of the drying air in the nozzle box (7, 7'), and a drying surface provided with nozzles (18) and facing the plate (8), wherein the drying air flows from a plurality of nozzles (18) arranged in rows in the drying surface onto the plate (8). The nozzle box (7, 7') is characterised in that the ratio of the sum of the openings of the nozzles (18) per square metre to the drying area is less than 1.1%.