Refiner Segment Depth Profile for Steam-Managed Material Flow
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Solution Overview
Problem
The interaction between steam and material flow in refiners for lignocellulosic materials disrupts the intended material flow paths, leading to inefficiencies and turbulence.
Innovation Solution
Refiner segments with a varying cross-sectional depth profile that separate material and steam flows by providing channels for steam and ridges for material to traverse, ensuring a surfing-like material flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If refiner segments with bars and dams are used to guide material flow, then material flow guidance is improved, but steam-material interaction increases causing turbulence and flow disruption
Solution Approach 1:
The refiner segment surface is segmented into distinct functional zones: bars for material cutting, dams for flow guidance, and channels for steam evacuation. This segmentation allows each element to perform its specific function without interfering with others, particularly by providing dedicated steam pathways that prevent steam from disrupting material flow
Solution Approach 2:
Channels act as intermediary structures between the bars/dams and the underlying refiner segment. These channels provide a designated pathway for steam to escape, serving as a mediator that prevents direct interaction between steam and material flow, thereby eliminating turbulence while maintaining effective material guidance
2Power
If friction heating during refining is allowed to occur naturally, then refining action is effective, but steam generation increases and disrupts material flow paths
Solution Approach 1:
The friction heat that naturally occurs during refining is not eliminated but rather its byproduct (steam) is converted from a harmful disruptor into a managed element. The channels provide controlled steam evacuation, transforming the harmful steam generation into a beneficial steam removal mechanism that maintains refining effectiveness without flow disruption
3Ease of manufacture
If conventional refiner segments with uniform depth are used, then manufacturing is simple, but material flow control is insufficient and steam interference occurs
Solution Approach 1:
The refiner segment features local variations in depth and structure: shallower areas for bars and dams, deeper channel regions for steam evacuation. This local quality differentiation allows the segment to perform multiple functions (material cutting, flow guidance, steam removal) simultaneously, improving material flow control while remaining manufacturable through conventional techniques
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
Enhances controlled material flow, resulting in a more even refining action and improved end product quality by minimizing steam-material interaction.
Implementation Method 1
the varying depth profile of the refiner segment may be utilized to separate the material flow and the steam flow on the refiner segment
Implementation Method 2
the refining or defibration action will cause friction which in turn will heat up the processed material
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
There is disclosed a refiner segment (10) adapted to be attached to a refiner disc (30) in a refiner (100) of lignocellulosic material, said refiner segment (10) being provided with a plurality of spaced apart bars (20,) extending in a direction from an inner periphery (10a) of said refiner segment (10) towards an outer periphery (10b) of said refiner segment (10), where each pair of adjacent bars (20κ; 20K+I) bounds a corresponding intermediate area (22) on said refiner segment (10). The refiner segment (10) comprises at least one intermediate area (22) that comprises a channel region (23) and a ridge region (24), said channel region (23) connecting at a first side (23b) to said ridge region (24) and extending deeper into said refiner segment (10) than said ridge region (24) in order to create an intermediate area (22) having a cross- section with a varying depth profile. Also disclosed are a refiner disc comprising such refiner segments and a refiner comprising a refiner disc comprising said refiner segments.