Web Drier Suction Blowing Trajectory Optimization
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Solution Overview
Problem
Traditional drier installations for paper webs consume excessive mechanical energy and suffer from significant thermal energy losses due to inefficient suction and blowing systems, leading to high investment and operating costs, as well as large surface occupation.
Innovation Solution
The suction and blowing devices are strategically positioned closer to the web, with trajectories optimized to minimize parallel components to the web, reducing the length of suction and blowing ducts and maintaining high energy potential of combustion products, thereby enhancing thermal transfer and compactness of the installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ventilator is positioned laterally at a large distance from the web, then the combustion products can be collected and mixed over the entire width of the web, but the mechanical energy consumption increases significantly and the duct size becomes important
Solution Approach 1:
The invention changes the positioning of the ventilator from a lateral position (outside the web width) to a position above the web in the longitudinal direction. This dimensional change allows the ventilator to be situated in a zone where combustion products are naturally concentrated, eliminating the need for large lateral ducts and reducing the mixing distance required, thereby significantly lowering mechanical energy consumption while maintaining effective combustion product collection
2Ease of operation
If the ventilator is positioned laterally at a large distance from the web, then the combustion products can be collected over the entire width, but the ducts dissipate thermal energy through radiation and convection
Solution Approach 1:
By repositioning the ventilator above the web in the longitudinal direction rather than laterally, the invention shortens the duct length and reduces the exposure of combustion products to the environment. This dimensional change minimizes the surface area of ducts through which thermal energy could be lost via radiation and convection, thereby preserving thermal energy while maintaining effective combustion product collection
3Ease of operation
If the ventilator is positioned laterally at a large distance from the web, then the combustion products can be mixed and divided over the entire width, but the installation occupies a large surface
Solution Approach 1:
The invention relocates the ventilator from a lateral position (occupying horizontal space outside the web) to a position above the web in the longitudinal direction. This dimensional change frees up lateral space, allowing the installation to be compacted within the web width boundaries while maintaining the ability to mix and distribute combustion products effectively across the entire web width
4Ease of operation
If the ventilator is positioned laterally at a large distance from the web, then the combustion products can be collected and mixed, but the temperature of the blown combustion products becomes considerably lower than the generated temperature
Solution Approach 1:
The invention positions the ventilator in a zone where combustion products are generated and concentrated, allowing the mixing and blowing operation to occur preliminarily close to the heat source. This preliminary action minimizes the distance combustion products travel through cooler environments, thereby preserving their temperature while maintaining effective collection and 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
This configuration results in reduced mechanical energy consumption, minimized thermal losses, and increased energy efficiency, allowing for a more compact and cost-effective drier installation with improved thermal transfer between combustion products and the paper web.
Implementation Method 1
the combustion products generated by the radiant elements
Implementation Method 2
at least one convective transversal system (7) equipped with suction and blowing devices to suck at least part of the combustion products produced by the radiant elements and to blow the said part of the combustion products towards the web
Implementation Method 3
gas-heated radiant elements (3)... to suck at least part of the combustion products produced by the radiant elements and to blow the said part of the combustion products towards the web
Implementation Method 4
the temperature of the combustion products blown on the web is considerably lower than the temperature of the combustion products generated by the radiant elements
Data Source
AI summary
A drier installation (1) for drying web (2), more particularly paper, which installation is provided for drying a maximum web width, the installation (1) comprises gas-heated radiant elements (3) for radiating the web, arranged according to at least one row (4) stretching out in the transversal (5) direction over the substantially entire maximum web width. The installation (1) comprises at least a transversal convective system (7, 36) equipped with suction and blowing devices (8) for sucking at least part of the combustion products produced by the radiant elements (3) by means of a suction duct (13) and for blowing this pa o the combustion products towards the web (2) by means of a blowing duct (14). Both suction (13) and blowing (14) ducts stretch out in the transversal (5) direction of the web (2). The convective system (7, 36 comprising at least a mixing device (12, 22, 28, 37, 46) installed opposite of the passing web (2) in relation to corresponding suction (13) and blowing (14) ducts and arranged so as to suck and/or blow the combustion products. The drier installation as subject of the present invention is characterized in that the vector average of the projections (V1, V2, V3, V5, V6, V7, V8) in a plane (P1) perpendicular to the web ( ) and stretching out in the transversal (5) direction of the web (2), has component (V4) parallel to the web (2) that is smaller than the maximum web width of the web (2), the vectors representing the respective trajectories of the different jets of sucked and/or blown combustion products.