Pulp Tower Filling Unit With Segmented Nozzles
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Solution Overview
Problem
Existing methods for filling and cleaning pulp towers in the wood-processing industry face issues such as uneven filling, pulp penetration into the dilution zone, air binding, surface level variations, and adhesion of pulp to the tower walls, leading to quality deterioration and operational inefficiencies.
Innovation Solution
A method and apparatus that uses a centrally located filling unit with a scooping feeder and adjustable rotational speed to ensure uniform pulp distribution close to the tower wall, minimizing air binding and pulp adhesion, and incorporates a washing system with nozzles positioned to avoid pulp jets, allowing for efficient filling and cleaning without manual supervision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pulp is pumped to the top of the tower and allowed to fall directly downward, then filling speed is improved, but pulp penetration into the dilution zone occurs causing uneven filling and quality deterioration
Solution Approach 1:
The filling process is segmented into multiple stages: initial filling phase and normal operation phase. The filling unit is segmented into multiple nozzles positioned at different locations. This segmentation allows different filling patterns to be applied at different times and locations, preventing uniform downward flow that causes penetration while maintaining high filling speed.
Solution Approach 2:
Different parts of the tower receive pulp with different characteristics. The filling unit directs pulp to different zones (center vs. periphery) with different flow patterns. This local differentiation ensures that pulp is distributed evenly throughout the tower cross-section, preventing concentration in the dilution zone while maintaining efficient filling.
2Manufacturing precision
If a rotating disk distributor is used to distribute pulp evenly, then filling uniformity is improved, but air binding occurs requiring energy-consuming vacuum pumps
Solution Approach 1:
The harmful element (air) is extracted from the system by positioning the filling unit and nozzles to allow air to escape naturally through the tower structure during filling. The nozzle arrangement and filling pattern facilitate air displacement without trapping, eliminating the need for vacuum pumps while maintaining uniform distribution.
Solution Approach 2:
Instead of using a rotating disk to distribute pulp (which traps air), the invention inverts the approach by using fixed nozzles positioned to spray pulp in a pattern that naturally displaces air upward and outward. The filling unit is positioned to allow air escape paths, reversing the conventional approach that requires active air removal.
3Reliability
If the tower is kept at optimal surface level, then pulp quality is maintained, but frequent filling operations are required increasing operational complexity
Solution Approach 1:
The filling unit is designed to operate continuously or intermittently without requiring tower emptying or complex shutdown procedures. The segmented nozzle system allows continuous filling while maintaining surface level control, eliminating operational interruptions and reducing complexity associated with frequent batch operations.
Solution Approach 2:
The filling system incorporates adjustable nozzle positioning and variable fill rates that adapt to changing tower conditions. This dynamic capability allows the system to maintain optimal surface levels automatically, reducing the need for manual intervention and complex operational procedures while ensuring consistent pulp quality.
4Ease of manufacture
If washing nozzles are positioned to clean the tower walls, then cleaning effectiveness is improved, but pulp jets may damage the nozzles
Solution Approach 1:
The washing nozzles are positioned in a different spatial dimension relative to the pulp flow path. Instead of placing nozzles directly in the pulp jet path, they are positioned at angles or locations where washing spray intersects tower walls without being exposed to direct pulp impact. This dimensional separation protects nozzles while maintaining cleaning effectiveness.
Solution Approach 2:
The tower wall itself serves as an intermediary between the washing nozzles and the pulp flow. Nozzles are positioned to spray against the wall, using the wall surface as the cleaning target rather than directly opposing the pulp stream. This intermediary positioning shields nozzles from pulp jet damage while ensuring thorough wall cleaning.
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
Enables efficient, automated filling and cleaning of pulp towers, maintaining pulp quality and reducing operational costs by preventing pulp penetration and adhesion, while ensuring consistent surface levels and minimizing energy consumption.
Implementation Method 1
A method and apparatus for filling and cleaning a pulp tower... uses a centrally located filling unit with a scooping feeder and adjustable rotational speed to ensure uniform pulp distribution close to the tower wall
Implementation Method 2
incorporates a washing system with nozzles positioned to avoid pulp jets, allowing for efficient filling and cleaning
Data Source
AI summary
The present invention relates to a method and apparatus for filling and cleaning a pulp tower. The invention is most suitable for filling and cleaning high- consistency pulp towers, bleaching towers, storage tanks and similar towers containing fiber suspensions, of the wood-processing industry. The apparatus and method according to the invention for filling and cleaning a pulp tower, in which method pulp is fed into the pulp tower either through its cover (10) or at least feed devices (24) arranged at its top, are characterized in that the space surrounding the feed device (24) is washable at the same time as the pulp is fed into the tower by means of washing devices (28, 30, 32) arranged in connection with the feed devices.