Multi-Stage Chemical Pulp Control Using Cross-Stage Feedback
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Solution Overview
Problem
Existing methods for controlling chemical pulp production in multi-stage processes lack effective integration across stages, leading to instability and variability in pulp quality.
Innovation Solution
A system and method where data is gathered and shared across process stages, including a woodyard, fiberline, and drying line, to adjust operations based on measurement results and availability, ensuring consistent pulp properties and optimized production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate stages are controlled independently by operators, then operational simplicity is maintained, but pulp quality stability deteriorates
Solution Approach 1:
The patent merges control across multiple process stages (woodyard, fiberline, drying line) into a unified control system. Data from measurement elements at each stage is collected and used to adjust process parameters across stages, transforming independent control into coordinated control to maintain pulp quality stability.
Solution Approach 2:
The patent implements feedback mechanisms where measurement results from each process stage are sent to subsequent stages, and information about processing capacity and material flow requirements is sent to preceding stages. This bidirectional feedback enables dynamic adjustment of process parameters to maintain quality stability.
2Stability of the object's composition
If data is shared across all process stages, then pulp quality stability is improved, but system complexity increases
Solution Approach 1:
The patent segments the control system into distinct functional modules: measurement elements at each stage, data collection systems, and control elements. Each stage has its own measurement and control components that operate semi-independently but are coordinated through data sharing, reducing overall system complexity while maintaining quality stability.
3Productivity
If real-time data collection and adjustment is implemented, then production optimization is achieved, but measurement and control requirements increase
Solution Approach 1:
The patent implements universal measurement and control elements that can be applied across multiple process stages. The same types of sensors and control mechanisms are used at the woodyard, fiberline, and drying line, standardizing the measurement and control approach and reducing the overall difficulty of implementation.
Data Source
AI summary
A method for chemical pulp production in a multi-stage process, comprising a first process stage, comprising a woodyard comprising steps such as debarking, chipping, pile storage and/or reclaim; a second process stage, comprising a fiberline comprising steps such as cooking and/or bleaching; and at least a third process stage; wherein a first set of data is gathered at least at the first and at the second process stage, wherein the first set of data for each process stage comprises measurement results and/or parameters calculated based on measurement results, wherein the measurements and/or parameters are related to raw material, equipment, process measurements and/or product properties; the first set of data is sent to the subsequent process stage, wherein the process steps of the subsequent process stage are adjusted based on the first set of data received; a second set of data is gathered at least at the second and at the third process stage, wherein the second set of data for each process stage comprises information related to availability of processing capacity, predicted availability of processing capacity and/or required material flow or quality; the second set of data is sent to the preceding process stage, wherein the process steps of the preceding process stage are adjusted based on the second set of data received.