Refiner Pumping Blade Bars for Material Feed
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Solution Overview
Problem
The existing refiner designs face challenges in efficiently feeding fibrous material from the planar portion to the conical portion, leading to fiber accumulation, increased energy consumption, and stress on the refiner structure due to the turning point and high steam pressure.
Innovation Solution
The refiner incorporates a stator and rotor with planar and conical portions, featuring blade bars with adjustable angles in the outermost refining zone to create a pumping effect, enhancing material flow while reducing residence time and energy consumption by optimizing blade bar angles between 5-50 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the refiner uses a turning point design between planar and conical portions, then the refining process can be completed, but fiber accumulation occurs and energy consumption increases
Solution Approach 1:
The planar portion of the refining surface is divided into multiple refining zones (first, second, and third zones) with progressively different blade bar angles. This segmentation allows each zone to perform a specific function in the material transport sequence, improving overall feed efficiency while managing energy consumption through zoned optimization.
Solution Approach 2:
Different refining zones have locally optimized blade bar angles tailored to their specific position and function. The first zone has smaller angles for initial material intake, while subsequent zones have progressively larger angles to enhance pumping effect and material transport, preventing accumulation at the turning point.
2Productivity
If the refiner uses a turning point design between planar and conical portions, then the refining process can be completed, but fiber accumulation occurs at the turning point
Solution Approach 1:
The planar portion is divided into multiple refining zones with progressively different blade bar angles. This segmentation creates a gradual transition in material flow characteristics, preventing sudden changes that cause accumulation at the turning point between planar and conical portions.
Solution Approach 2:
The blade bar angle parameter is systematically varied across different refining zones, increasing from the first to the third zone. This parameter change optimizes the pumping effect at each stage, ensuring steady material flow through the turning point and into the conical portion without accumulation.
3Productivity
If the refiner operates with high steam pressure for efficient refining, then refining effectiveness improves, but axial forces increase causing stress on refiner structure
Solution Approach 1:
The refining process is segmented into multiple zones with different blade bar angles, allowing progressive material transport and refining. This segmentation enables efficient refining to be achieved through optimized geometry in each zone rather than relying solely on high steam pressure, thereby reducing axial forces on the structure.
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 improves material feed from the planar to the conical portion, reducing fiber accumulation and energy consumption, increasing production capacity, and minimizing axial forces on the refiner.
Implementation Method 1
blade bars configured to form blade bars having a pumping blade bar angle, their blade bar angle being greater at least on the outermost portion of the outermost refining zone of the refining surface than the blade bar angle of the blade bars in the previous refining zone in the radial direction of the planar portion, and that the blade bar angle of the pumping blade bars in the outermost refining zone is 5 - 50 degrees so that the blade bars in the outermost refining zone have an overall pumping effect on the material to be refined
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A refiner (1) comprising a stator (2) and a rotor (6) that comprise a planar portion and a conical portion after the planar portion, which in turn comprise refining surfaces (4, 8) provided with blade bars (15, 18, 24) and blade grooves (16, 19, 25) therebetween, and the planar portions (4', 81) of the refining surfaces (4, 8) of the stator (2) and the rotor (6) comprising at least two refining zones (14, 17, 23) in the direction of the radius (R) of the planar portion. At least the planar portion (8') of the refining surface (8) of the rotor (6) is provided with blade bars (18) in its outermost refining zone (17) in the direction of the radius (R), the blade bar angle (a) of the blade bars being arranged so as to provide pumping blade bars, and their blade bar angle (a) being greater than the blade bar angle (a) of the blade bars (15, 24) in the previous refining zone (14, 24) in the direction of the radius (R) of the planar portion (8') and that the blade bar angle (a) is 5 - 50 degrees so that the blade bars (18) in the outermost refining zone (17) have an overall pumping effect on the material to be refined.