Multivariable Control for Recycled Fibre Flotation
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Solution Overview
Problem
The recycled fibre process faces challenges in achieving optimal quality due to varying raw material quality, suboptimal chemical and mechanical processing, and lack of automation, leading to inefficient flotation and process control, resulting in poorer end-product quality and frequent shutdowns and start-ups.
Innovation Solution
A control method and system that utilizes sensors and multivariable controllers to measure and adjust process parameters such as pulp consistency, pH, temperature, and air bubble size, enabling more effective control of flotation and improving the quality of the end-product by optimizing chemical and mechanical processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manual control methods are used in flotation process, then operational flexibility is maintained, but manufacturing precision and end-product quality deteriorate
Solution Approach 1:
The patent implements automated feedback control systems that continuously monitor flotation process parameters (air flow rate, pulp consistency, chemical dosage) and automatically adjust them to maintain optimal flotation conditions. This resolves the contradiction by replacing manual control with automated feedback loops that improve manufacturing precision without requiring complex human intervention, as the system self-regulates based on real-time process data.
Solution Approach 2:
The patent replaces manual mechanical control operations with automated sensor-based control systems. Instruments automatically measure parameters such as air bubble size, pulp consistency, and chemical concentrations, then automatically adjust process conditions without manual mechanical intervention. This substitution improves manufacturing precision while the automation handles complexity, freeing operational flexibility to the control system rather than human operators.
2Manufacturing precision
If chemical and mechanical processing parameters are not optimized, then process simplicity is maintained, but manufacturing precision and flotation efficiency deteriorate
Solution Approach 1:
The patent implements dynamic optimization of chemical and mechanical processing parameters during flotation operations. The system continuously adjusts air flow rates, pulp consistency, and chemical dosages based on real-time process conditions and measured outcomes. This dynamic adjustment resolves the contradiction by allowing parameter optimization without fixed complex procedures, as the system adapts automatically to changing conditions while maintaining flotation efficiency.
Solution Approach 2:
The patent systematically optimizes key process parameters including air flow rate, pulp consistency, pH levels, and chemical dosages to maximize flotation efficiency. By implementing controlled parameter changes and maintaining them within optimal ranges through automated control, the system achieves high manufacturing precision without requiring complex manual adjustment procedures, as the parameters are stabilized through automated regulation.
3Productivity
If flotation process is not properly controlled, then operational simplicity is maintained, but productivity and end-product quality deteriorate
Solution Approach 1:
The patent implements automated feedback control that continuously monitors flotation performance and automatically adjusts process parameters to maintain optimal productivity. The system measures outcomes such as ink removal efficiency and pulp quality, then automatically adjusts air flow, chemical dosage, and other parameters to maximize production rate while maintaining quality standards, resolving the contradiction between productivity and automation extent.
Solution Approach 2:
The patent enables the flotation system to self-regulate and self-optimize through automated control algorithms that adjust process parameters without external intervention. The system automatically responds to changing conditions, maintains optimal flotation performance, and ensures consistent end-product quality, thereby improving productivity while the automation handles control complexity internally without requiring extensive external automation infrastructure.
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 solution enhances the controllability of the flotation process, improves end-product quality, and reduces shutdown and start-up times by optimizing chemical and mechanical processing, ensuring consistent production and meeting predefined quality standards.
Implementation Method 1
the cleaned and diluted pulp is led to flotation that will remove the free ink
Data Source
AI summary
A multivariabie controller (634) receives from a recycled fibre line at least two measuring results, of which at least one relates to accept measurement and at least one to reject measurement. The multivariable controller (634) controls on the basis of at least one accept-related measuring result and at least one reject- related measuring result the mechanical processing of the flotation process and the supply of at least one chemical affecting flotation into the recycled fibre process