Multiple Nip Washer Press Segmented Wash Zones
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Solution Overview
Problem
Conventional pulp washer presses face challenges in achieving high solids concentrations due to clogging issues and inefficient impurity removal, particularly in achieving optimal washing and dewatering results with existing single displacement wash zones and limited surface area contact.
Innovation Solution
A multiple nip multiple displacement wash zone washer press system with a mechanical or pressurized distributor that allows controlled introduction of wash water across a wider drum surface area, incorporating multiple pulp slide plates to create additional wash zones and increase surface contact, enabling higher solids concentration processing and improved impurity removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solids concentration at the nip point is increased to improve impurity removal, then the amount of impurities removed increases, but the trough becomes clogged
Solution Approach 1:
The single displacement wash zone is segmented into multiple wash zones by introducing additional pulp slide plates. This creates separate compression and washing regions, allowing the system to process higher solids concentrations without clogging the entire trough, as each zone can be optimized independently for its specific function
Solution Approach 2:
The invention extends the washing process from a single linear displacement zone to multiple zones distributed along the drum circumference. This dimensional expansion allows progressive washing at different solids concentrations, preventing clogging while maintaining high impurity removal efficiency
2Device complexity
If a single displacement wash zone is used to simplify the system, then the device complexity is reduced, but the washing efficiency and impurity removal are limited
Solution Approach 1:
The wash press is segmented into multiple displacement wash zones with separate pulp slide plates for each zone. This segmentation allows independent control of washing parameters in each zone, significantly improving overall washing efficiency and impurity removal compared to a single zone system
Solution Approach 2:
Each displacement wash zone is designed with specific local characteristics optimized for its function. The pulp slide plates are positioned to create appropriate compression forces and wash water distribution patterns for each zone, enabling tailored washing conditions that maximize productivity
3Productivity
If the drum surface area contact is increased to improve washing, then the washing efficiency increases, but the device complexity and space requirements increase
Solution Approach 1:
Instead of using a single large drum surface area, the invention segments the washing function into multiple zones along the drum circumference. This allows efficient use of the available drum surface by concentrating washing action in specific zones rather than distributing it uniformly across the entire surface
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
The system achieves increased washing efficiency and purity levels, accommodating a wide range of solids concentrations while using the same amount of water, with enhanced impurity removal and increased production capacity, resulting in a more purified pulp mat and improved processing efficiency.
Implementation Method 1
the pulp suspension moves within a trough adjacent to the drum
Implementation Method 2
the pulp suspension is pressed against at least one rotating cylindrical drum in order to separate some of the water and move this water out of the pulp suspension into the interior of the drum
Implementation Method 3
the wash water merely mixes with existing impurities
Data Source
Figure 1~2
Figure 3~4
AI summary
A washer press (101; 201) apparatus for washing and dewatering a wide range of solids concentrations of pulp in liquid suspensions includes multiple distinct displacement wash zones about a drum (105; 205) with multiple nips.