Fibrous Suspension Purification via Single Pump Extraction
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Solution Overview
Problem
Existing methods for removing impurities from fibrous stock suspensions, such as waste paper pulp, face issues with wear and clogging due to the high proportion of solids and impurities, particularly in control valves and pumps used between stages.
Innovation Solution
Providing a pump only upstream of the first preliminary stage and measuring/control only the accept fraction at each stage, eliminating the need for pumps and control valves in connecting lines between stages, allowing pressure and volume flow regulation through accept and dilution water management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control valves and pumps are installed in connecting lines between stages to maintain pressure level and control volume flow, then pressure control and flow regulation are improved, but wear and clogging of components increase due to high proportion of solids and impurities
Solution Approach 1:
The patent removes pumps and control valves from the connecting lines between stages, extracting the harmful components that cause wear and clogging. Instead, it uses a single pump upstream of the first preliminary stage and relies on the inherent pressure characteristics of the sorting device to maintain pressure levels throughout the system.
Solution Approach 2:
The system uses the inherent pressure characteristics of the sorting device to automatically maintain pressure levels without requiring additional control valves or pumps in the connecting lines. The single pump upstream provides sufficient pressure for all stages, and the system self-regulates flow distribution based on the sorting device's characteristics.
2Manufacturing precision
If multiple pumps and control valves are installed between stages to control volume flow, then flow control precision is improved, but device complexity and susceptibility to wear increase
Solution Approach 1:
The patent removes the complex array of pumps and control valves from the system, retaining only a single pump upstream of the first preliminary stage. This extraction of unnecessary components simplifies the device while maintaining adequate flow control through the inherent characteristics of the sorting device and strategic water addition points.
Solution Approach 2:
The system controls volume flow by changing parameters at strategic points - specifically by adding water at controlled rates to the reject fraction before it enters subsequent stages. This parameter change (water addition rate) controls the flow distribution without requiring complex valve and pump systems in each connecting line.
3Stress or pressure
If pumps and control valves are installed in each stage connecting line, then individual stage pressure control is improved, but maintenance requirements and downtime increase due to wear and clogging
Solution Approach 1:
The patent extracts all pumps and control valves from the connecting lines between stages, eliminating the components that require maintenance. The single upstream pump and the sorting device's inherent pressure characteristics provide sufficient pressure control without requiring additional maintenance-prone components.
Solution Approach 2:
The system maintains pressure control through the inherent characteristics of the sorting device and a single upstream pump, eliminating the need for multiple maintenance-prone components. The design allows the system to self-regulate pressure without requiring frequent maintenance of multiple valves and pumps.
Data Source
AI summary
The method involves separating a fibrous suspension in reject and accept fractions through filters of stages (4, 5, 6). The suspension of the stages (4, 5) is loaded with pressure that is produced by a pump. Flow rates are controlled or measured by the fractions. The flow rate of the accept fraction is only controlled or measured in contrast to the flow rate of the reject fraction which is neither controlled or measured at the stages.