Nested Disc and Drum Screen for Biomass Separation
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Solution Overview
Problem
Existing screening technologies face inefficiencies when handling high volumes of damp, bulky, and non-uniform materials, such as biomass, plastic, textiles, and cardboard, which can cause 'blinding' and 'plugging' in drum screens and are not effectively separated by disc screens, especially when fine particles are involved, leading to the need for additional costly apparatus and processes.
Innovation Solution
An integrated trommel and disc screen unit where the disc screen is positioned inside the rotary drum screen, allowing for the creation of three graded streams through the combination of the two screening mechanisms, with the disc screen anchored at either end and the drum screen free to rotate, enabling efficient separation of mixed materials into oversized, midsized, and undersized streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a drum screen is used to separate fine particles, then fine particle separation is improved, but damp and bulky materials cause blinding and plugging of the screen openings
Solution Approach 1:
The invention divides the screening function into two separate devices: a drum screen for fine particle separation and a disc screen for bulk material handling. Each screen operates independently with its own opening structure, preventing blinding and plugging while maintaining fine particle separation capability.
Solution Approach 2:
The disc screen is positioned inside the drum screen, with the disc screen assembly nested within the drum screen structure. The disc screen handles bulk materials first, and the drum screen processes the remaining material for fine particle separation, creating a hierarchical screening system.
2Reliability
If a disc screen is used to handle damp and bulky materials, then blinding and plugging are reduced, but fine particle separation effectiveness decreases
Solution Approach 1:
The screening process is segmented into two stages: first the disc screen handles damp and bulky materials to prevent blinding, then the drum screen performs fine particle separation on the pre-sorted material, ensuring both reliability and precision.
Solution Approach 2:
The disc screen performs preliminary screening of damp and bulky materials before they reach the drum screen. This preliminary action removes oversized bulk materials that would otherwise cause blinding in the drum screen, allowing the drum screen to focus on fine particle separation.
3Reliability
If multiple apparatus are used in series for pre-sorting and secondary screening, then difficult to screen materials are handled effectively, but device complexity and cost increase
Solution Approach 1:
The invention merges the functions of pre-sorting and secondary screening into a single integrated device where the disc screen and drum screen work together in series within one structural unit, eliminating the need for separate apparatus and reducing overall system complexity.
Solution Approach 2:
By nesting the disc screen inside the drum screen, the invention combines multiple screening functions in a compact configuration, reducing the number of separate apparatus needed while maintaining effective handling of difficult materials.
Data Source
AI summary
The present invention provides a combination screening apparatus for screening a mixed material into three graded streams, comprising a disc screen wholly, substantially or partly located within a rotary drum screen. The present invention may be conveniently arranged on a mobile chassis with a simple arrangement of a feed hopper to feed a feed end, and a layered or stacked configuration for the discharge of the so-formed graded streams at a discharge end.