Rotary Drum Filter Deck with Segmented Drain Channels
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Solution Overview
Problem
Existing rotary drum filters in the pulp and paper industry face challenges in achieving high filtering efficiency while maintaining low manufacturing and installation costs, particularly in the design of corrugated deck structures.
Innovation Solution
A corrugated deck section is rigidly connected to a rotary drum structure using solid divider grids, with intermediate grids subdividing the drain channel into compartments and plug dams preventing filtrate flow between them, and drainage slits allowing filtrate to flow into these compartments for efficient drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple drain slits per port are provided with each corresponding to a single drain channel, then filtering efficiency is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
Multiple drain slits are merged into a single shared drain channel instead of having separate channels for each slit. This reduces the number of components and simplifies the deck structure while maintaining the ability to distribute filtrate to multiple compartments, thereby improving filtering efficiency without proportionally increasing device complexity
Solution Approach 2:
The single drain channel serves multiple functions by receiving filtrate from multiple drain slits and distributing it to multiple compartments. This multi-functional design reduces overall system complexity while achieving high filtering efficiency through proper filtrate management
2Productivity
If intermediate grids are provided to subdivide drain channels into compartments, then filtrate distribution is improved, but device complexity and installation cost increase
Solution Approach 1:
The drain channel is segmented into multiple compartments using intermediate grids, allowing filtrate to be distributed to different compartments. This segmentation improves productivity by enabling parallel filtrate collection from multiple areas while keeping each compartment manageable in size
Solution Approach 2:
Intermediate grids act as intermediary structures that facilitate filtrate distribution from the main drain channel to multiple compartments. These grids provide a simple mechanical solution for achieving efficient filtrate distribution without requiring complex piping or additional active components
3Reliability
If plug dams are provided to prevent filtrate flow between compartments, then filter efficiency is maintained, but manufacturing and installation costs increase
Solution Approach 1:
Plug dams are placed locally at specific positions where compartment intersections occur, providing filtration separation only where needed. This localized approach maintains filter efficiency by preventing unwanted filtrate mixing between compartments while minimizing the total amount of material and labor required for manufacturing and installation
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 enhances filtering efficiency and reduces manufacturing and installation costs by ensuring effective drainage and maintaining filter efficiency through the use of solid grids and plug dams, applicable to various types of rotary drum filters.
Implementation Method 1
drainage slits are provided in the corrugated deck in alignment with each of the compartments. Filtrate may thus flow through the drainage slits and into a respective one of the compartments
Implementation Method 2
Plug dams are provided in the corrugation spaces between the upper edge of the intermediate grids and the lower corrugated deck surface so as to prevent substantially filtrate flow between individual compartments
Data Source
AI summary
A drum structure for corrugated type rotary filters has relatively high filtering efficiency and relatively low manufacturing and/or installation costs. More specifically, a corrugated deck section is rigidly connected to a rotary drum structure by means of solid non-apertured divider grids which establish a drain channel. The drain channel is subdivided into respective compartments by means of intermediate solid non-apertured grids which are unconnected to the corrugated deck, but provide subjacent radial support thereto. Drainage slits are provided in the corrugated deck in alignment with each of the compartments. Plug dams are provided in the corrugation spaces between the upper edge of the intermediate grids and the lower corrugated deck surface so as to prevent substantially filtrate flow between individual compartments. Filtrate may thus flow through the drainage slits and into a respective one of the compartments where it can then subsequently be drained transversely and longitudinally into a respective port associated with the drum filter.