Pulper Screening With Rotor Power Feedback for Fibrous Suspension
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Solution Overview
Problem
Conventional screening devices for fibrous suspensions experience frequent alarm messages due to fluctuations in contaminant content, leading to system overloads and limited intervention capabilities due to inertia and numerous influencing factors.
Innovation Solution
Regulate the inflow of fibrous suspension and rinsing water into the screening device based on the power consumption of the rotor drive, adjusting cycle durations and inflow rates to prevent overloading and optimize contaminant discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screening device operates with fixed cycle times and inflow rates, then the system structure remains simple, but frequent alarm messages occur due to contaminant load fluctuations causing system overloads
Solution Approach 1:
The patent implements dynamic adjustment of cycle times and inflow rates based on real-time power consumption monitoring. The control system adapts operational parameters dynamically rather than using fixed values, allowing the screening device to respond to varying contaminant loads and prevent overloads while maintaining operational stability.
Solution Approach 2:
The patent employs a feedback mechanism where power consumption of the rotor drive is continuously monitored and fed back to the control system. This feedback enables the system to detect approaching overload conditions and adjust operational parameters accordingly, preventing alarm messages while maintaining simple overall system architecture.
2Productivity
If the inflow rate of fibrous suspension is increased to improve productivity, then more material is processed per unit time, but the rotor drive becomes overloaded causing frequent alarms
Solution Approach 1:
The patent dynamically adjusts the inflow rate of fibrous suspension based on real-time power consumption measurements. When power consumption approaches critical levels, the system automatically reduces inflow rates to prevent rotor drive overload, allowing high productivity during low-load conditions while maintaining reliability during high contaminant loads.
Solution Approach 2:
The patent changes operational parameters (inflow rate and cycle time) based on detected power consumption levels. By varying these parameters dynamically rather than maintaining constant values, the system optimizes productivity across different operating conditions while preventing overload situations that would cause alarms.
3Speed
If the cycle time is shortened to increase operating speed, then more cycles are completed per unit time, but the rotor drive cannot process the material adequately causing overloads
Solution Approach 1:
The patent implements dynamic adjustment of cycle times based on power consumption monitoring. When contaminant loads increase and power consumption rises, the system extends cycle times to allow adequate processing capacity utilization, preventing overloads. During low-load periods, shorter cycles maintain high operating speed and productivity.
Solution Approach 2:
The control system uses feedback from power consumption measurements to adjust cycle timing. This feedback mechanism ensures that cycle times are sufficient for adequate material processing while maximizing operational speed, preventing the rotor drive from becoming overloaded due to excessively short cycles.
Data Source
AI summary
A method for operating a screening device for cleaning a fibrous suspension includes the steps of: providing that the screening device includes a housing, a rotor arranged in the housing, and a screen; feeding the fibrous suspension and a rinsing water to the screening device; passing a portion of the fibrous suspension through the screen; discharging the portion of the fibrous suspension passing through the screen via an accepted stock discharge; and regulating, depending on a power consumption of a rotor drive, at least one of an inflow into the screening device and a cycle duration.