Fiber Web Nozzle System with Coanda-Guided Impingement Drying
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Solution Overview
Problem
Existing nozzle systems for contact-free treatment of fiber webs, such as drying and cooling, face challenges in achieving efficient heat transfer and require larger dryer sizes, limiting drying speed and energy efficiency.
Innovation Solution
A nozzle system comprising an overpressure nozzle part combined with symmetric direct impingement nozzle parts, utilizing curved Coanda-surfaces and integrated gas channels, ensures no discharge passage between nozzle parts, optimizing gas distribution and flow direction for enhanced heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If existing nozzle systems are used for contact-free treatment of fiber webs, then the current dryer size is maintained, but heat transfer capability is insufficient and drying speed is limited
Solution Approach 1:
The patent combines overpressure nozzles and direct impingement nozzles into a single integrated nozzle system. The overpressure nozzles create a high-velocity gas flow that impinges directly on the fiber web surface, while the direct impingement nozzles provide additional focused gas jets. This merging of two nozzle types in one system achieves superior heat transfer capability (10-25% increase) and faster drying speeds without increasing dryer size.
2Use of energy by moving object
If larger dryer sizes are used to improve heat transfer, then heat transfer capability increases, but device complexity and space requirements increase
Solution Approach 1:
The patent changes the operational parameters of the nozzle system by optimizing gas velocity, pressure, and flow distribution through the integrated overpressure and direct impingement nozzles. By adjusting these parameters, the system achieves enhanced heat transfer capability within the existing dryer footprint, eliminating the need to increase dryer size while maintaining improved thermal efficiency.
3Productivity
If more energy is consumed to increase drying speed, then drying speed improves, but energy efficiency decreases
Solution Approach 1:
The patent utilizes pneumatic principles through the overpressure nozzle system that generates high-velocity gas flows to impinge on the fiber web. This pneumatic approach enables faster drying speeds by enhancing convective heat and mass transfer, while the integrated design optimizes energy utilization to improve overall energy efficiency compared to conventional drying systems.
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 system achieves a 10-25% increase in heat transfer capability, enabling faster drying and energy savings by improving heat transfer efficiency and reducing energy consumption.
Implementation Method 1
gas flows, which are guided against each other with the aid of curved Coanda-surfaces formed on each side of the carrier surface
Implementation Method 2
at least one nozzle orifice row formed of nozzle orifices configured to blow gas flows mainly perpendicularly in view of upper surface of the direct impingement nozzle parts
Implementation Method 3
by gas flows, typically by air flows to dry, cool, support, carry etc. a running fiber web without contacting the fiber web
Data Source
Figure 1~2
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AI summary
The invention relates to a nozzle system of a device for contact-free treatment of a running web, which nozzle system (10) comprises an overpressure nozzle part (20) and at least one direct impingement nozzle part (25A; 25B) arranged on either side of the overpressure nozzle part (20) and in which nozzle system (10) the direct impingement nozzle part (25A, 25B) is combined with the overpressure nozzle part (20) such that no discharge passage for discharging gases is formed between the direct impingement nozzle part (25A; 25B) and the overpressure nozzle part (20), in which nozzle system (10) the overpressure nozzle part (20) has a carrier surface (24) and on both sides of the carrier surface (24) a nozzle orifice row formed of nozzle orifices (18A, 18B) and extending in length direction of the nozzle system (10) and which nozzle orifices (18A, 18B) are configured to blow gas flows, which are guided against each other with the aid of curved Coanda-surfaces (22A, 22B) formed on each side of the carrier surface (24), in which nozzle system (10) the direct impingement nozzle part (25A; 25B) comprises at least one nozzle orifice row formed of nozzle orifices (16A, 16B) configured to blow gas flows mainly perpendicularly in view of upper surface of the direct impingement nozzle parts (25A, 25B). The overpressure nozzle part (20) comprises on the carrier surface (24) at least one row of direct impingement nozzle orifices (21) configured to provide direct impingement blowing by gas flows directed mainly perpendicularly in view of the upper surface of the overpressure nozzle part (20).