Screw Conveyor Oxidation Control for Wet Beaded Carbon Black
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Solution Overview
Problem
The existing methods for controlling the oxidation of wet beaded carbon black in screw conveyors face challenges in detecting and preventing the destruction of carbon black beads, leading to reduced pellet strength and increased fines content.
Innovation Solution
A control device and method that monitor the motor current of the screw conveyor and adjust the rotational speed based on the difference between the required and actual motor current, ensuring optimal oxidation without bead destruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational speed of the screw conveyor is increased to improve productivity, then the oxidation degree increases, but the carbon black beads are destroyed leading to reduced pellet strength
Solution Approach 1:
The system monitors motor current as a feedback signal indicating bead destruction and automatically adjusts rotational speed to maintain optimal oxidation while preventing pellet damage. The control device compares actual motor current with reference values and modifies operational parameters in real-time based on the difference signal.
Solution Approach 2:
The system dynamically changes the rotational speed parameter based on motor current measurements. By adjusting this key operational parameter, the system optimizes the balance between oxidation efficiency and pellet integrity, transitioning from static to adaptive parameter control.
2Productivity
If the rotational speed is increased to process more material, then productivity improves, but fines content increases due to bead destruction
Solution Approach 1:
Motor current serves as a feedback indicator of bead destruction and fines generation. The control system uses this feedback to adjust rotational speed, preventing excessive bead breakage and associated fines production while maintaining high processing rates.
3Strength
If a control device is introduced to detect and prevent bead destruction, then pellet strength is maintained, but device complexity increases
Solution Approach 1:
The system uses the motor's own current consumption as the detection signal for bead destruction. This self-service approach eliminates the need for external sensors or complex monitoring equipment, as the existing motor electrical characteristics provide the necessary feedback information.
Solution Approach 2:
The system repurposes an existing electrical parameter (motor current) for a new control function, transforming a simple electrical measurement into a sophisticated process control signal without adding hardware complexity.
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 effectively maintains the desired degree of oxidation, enhances pellet strength, reduces pellet attrition and fines content, and allows for versatile operation by adjusting to varying input rates of wet beaded carbon black.
Implementation Method 1
the screw conveyor (200, 300) comprises an electrical motor (215) for driving a conveyor screw (213)
Implementation Method 2
the reaction chamber (218) comprising ozone, wherein the method comprises a current regulated power control of the motor
Data Source
AI summary
The present invention relates to a method for controlling the oxidation of wet beaded carbon black in a screw conveyor. It has surprisingly been found that the motor current used to drive the conveyor screw is an indicator for the destruction of the wet beaded carbon black during the oxidation. The inventive method as well as control device utilize said motor current and adepts the rotational speed of the screw.