Angled Refiner Blade for Lignocellulosic Material Flow
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Solution Overview
Problem
The high energy consumption and cost associated with refining lignocellulosic material in pulping processes, as existing refiner blades hinder material flow and increase wear, leading to inefficient fiber quality and energy usage.
Innovation Solution
A refiner blade design featuring angled refiner bars and dams that minimize flow restriction, with adjustable dam heights and grooves to enhance material lifting and transport, reducing energy consumption and wear while maintaining refining quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional refiner blades with dams are used to lift lignocellulosic material into the refining gap, then material lifting capability is improved, but flow restriction increases leading to higher energy consumption
Solution Approach 1:
The dam is designed with an angled configuration rather than a vertical structure, allowing material to flow along the angled surface. This dynamic approach to material flow reduces resistance and energy consumption while maintaining effective lifting capability into the refining gap
Solution Approach 2:
The dam angle is optimized to balance between lifting efficiency and flow restriction. By changing the geometric parameter of the dam from vertical to angled, the system achieves reduced energy consumption while preserving material lifting function
2Manufacturing precision
If dams are used to lift material into the refining gap, then refining quality is improved, but wear on the blade increases
Solution Approach 1:
The angled dam design creates a more favorable flow pattern that reduces turbulent impact and mechanical stress on the blade surface. This dynamic flow management decreases wear rates while maintaining the material lifting function necessary for high refining quality
Solution Approach 2:
By optimizing the dam angle parameter, the system achieves a balance where material is effectively lifted for high refining quality while the angled configuration reduces direct impact and friction, thereby extending blade lifetime
3Manufacturing precision
If dams are positioned to effectively lift material, then fiber quality is improved, but material flow restriction increases
Solution Approach 1:
The angled dam configuration allows material to flow dynamically along its surface rather than being blocked by a vertical barrier. This maintains effective lifting for fiber quality while preserving continuous material flow and productivity
Solution Approach 2:
The dam angle parameter is optimized to simultaneously achieve effective material lifting for quality and minimal flow restriction for productivity, resolving the contradiction between these two requirements
Data Source
AI summary
A blade for a refiner for refining lignocellulosic material is delimited by an inner periphery and an outer periphery and includes: a blade surface with a refiner portion on which a plurality of refiner bars are arranged, where: each refiner bar extends from an outer bar end to an inner bar end, and the plurality of refiner bars are arranged so that a movement along a bar extension from an outer bar end to an inner bar end of a refiner bar is also a movement in a first circumferential direction; and a dam that extends from an outer dam end to an inner dam end and connects at least three refiner bars, and wherein the dam is arranged so that a movement along a dam extension from an outer dam end to an inner dam end is also a movement in the first circumferential direction.