Double-disc refiner center plate for pulp feed distribution
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Solution Overview
Problem
Double-disc pulp refiners face issues with uneven and turbulent material feed due to non-central entry of feedstock, leading to higher specific energy consumption and lower production rates, as material piles up at the center of the refining discs rather than being refined at the periphery.
Innovation Solution
A center plate with a cross-sectional profile that protrudes to the same or higher maximum height than the refining segments on the first disc, positioned to prevent material from piling up at the center and guide it towards the periphery, maintaining a minimal safe distance from the opposing disc to avoid contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If feedstock enters non-centrally into the refiner, then the refiner structure is simpler, but material distribution becomes uneven and turbulent causing material to pile up at the center
Solution Approach 1:
A center plate is introduced as an intermediary component between the non-central feedstock entry and the refining zone. The center plate acts as a mediator that redirects material flow from the non-central entry point toward the periphery, preventing material piling at the center while maintaining the simple refiner structure.
Solution Approach 2:
The refiner is segmented into distinct functional zones by introducing the center plate, which creates a flow guidance zone that separates the feedstock entry region from the refining zone. This segmentation allows independent optimization of material distribution without complicating the overall refiner structure.
2Ease of operation
If material piles up at the center of the refining discs, then the refiner operates with simpler material handling, but specific energy consumption increases and production rate decreases
Solution Approach 1:
The center plate performs preliminary action by guiding material flow toward the periphery before the material enters the refining zone. This pre-positioning of material ensures uniform distribution into the refining segments, preventing piling up and ensuring continuous efficient operation, thereby increasing production rate without complicating material handling.
3Stability of the object's composition
If the center plate protrudes to maximum height equal to or higher than the refining segments, then material distribution is improved, but the distance to the opposing disc becomes minimal risking contact
Solution Approach 1:
The center plate's protrusion height is precisely controlled as a critical parameter. By optimizing this parameter to be equal to or slightly less than the refining segment height, the design achieves effective material guidance while maintaining sufficient clearance from the opposing disc, balancing material distribution improvement with operational reliability.
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 solution stabilizes and efficiently directs material feed, reducing turbulence and energy consumption, increasing production rates and minimizing steam flow through the refiner.
Implementation Method 1
the pulp is refined under the influence of heat and friction generated by the counter-rotating discs
Implementation Method 2
the pulp is refined under the influence of heat and friction generated by the counter-rotating discs
Data Source
AI summary
A double disc refiner includes a first refining disc at a feed end and an opposing second refining disc. The first disc has inlet opening(s) and a first distal surface facing a second disc opposing surface. A first disc refining segment has a second distal surface facing the opposing surface that has a first height relative to a plane of the first distal surface in a direction toward the opposing surface. A first disc center plate has elongated protrusions radially extending therefrom and a third distal surface having a second height in the direction of the first height that is at least equal to the first height. Each protrusion has a fourth distal surface continuous with the third distal surface and a third height in the direction of the first height equal to the second height. The third distal surface is separated from the opposing surface by 5-15 mm.