Edge-Free Throwing Plate for Rotary Kiln Drying
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Solution Overview
Problem
Caking of asphalt material on the throwing plates in rotary kilns during the drying and heating process impedes material flow and leads to functional failure, as the edges of conventional throwing plates contribute to this issue.
Innovation Solution
The throwing plates are designed with an edge-free contour in a plane perpendicular to the material conveying direction, reducing the risk of caking and enabling targeted material transport, and the angle of inclination of these plates influences the pouring behavior to ensure even heat transfer and efficient material heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional throwing plates with edges are used, then material can be conveyed through the drying unit, but caking occurs on the throwing plates which impedes material flow and leads to functional failure
Solution Approach 1:
The throwing plate is designed with a curved, edge-free contour in the plane perpendicular to the material conveying direction. This curvature eliminates sharp edges where material would otherwise accumulate and cake, allowing material to flow smoothly over the throwing plate surface without adhesion points, thereby maintaining both productivity and reliability
2Reliability
If the throwing plate has an edge-free contour, then caking is reduced and eliminated, but the design complexity increases
Solution Approach 1:
The throwing plate employs a curved contour that is simple in form but effective in function. The curvature is achieved through a straightforward geometric design that eliminates edges without requiring complex multi-component structures, thus maintaining manufacturing simplicity while achieving reliable caking prevention
3Manufacturing precision
If the throwing plate angle of inclination is adjusted, then material pouring behavior is optimized for even heat transfer, but the manufacturing precision requirements increase
Solution Approach 1:
The angle of inclination of the throwing plate is optimized to a specific range (15-30 degrees) that naturally promotes even material distribution and heat transfer. This parameter optimization achieves manufacturing precision goals through a single geometric parameter that can be controlled within standard fabrication tolerances, avoiding the need for complex multi-parameter adjustments
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 prevents caking, ensures reliable and trouble-free material heating, improves heat transfer efficiency, and maintains a consistent material veil within the drying unit, enhancing the overall efficiency of the material heating process.
Implementation Method 1
As a result of gravity, the material falls onto or into a subsequent throwing plate when the material has passed the end oriented in the material throwing plate conveying direction
Implementation Method 2
A drying unit in the form of a rotary kiln is used, for example, in plants for the production of asphalt. A rotary kiln is known, for example, from GB 1 396 402 A, FR 871 651 A, FR 2 297 394 A1 or DE 26 26 625 A1. The rotary kiln is used to heat and mix used asphalt granules
Implementation Method 3
The rotary kiln is used to heat and mix used asphalt granules, so-called recycling (RC) material. During drying and heating, the material is conveyed through the drying unit, which rotates about a longitudinal axis. This will mix the material
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A throwing plate (27) for a drying unit (1) defines a material throwing plate conveying direction (39), wherein the throwing plate (27) has an edge-free contour in a plane oriented perpendicular to the material throwing plate conveying direction (39).