Ladle Tracking via Transfer Car RFID to Minimize Thermal Loss
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Solution Overview
Problem
In integrated steel plants, the monitoring of ladles carrying molten metal is hindered by the failure of RFID tags due to high temperatures and environmental conditions, leading to increased costs, energy inefficiencies, and suboptimal crane scheduling, resulting in thermal losses and higher energy consumption.
Innovation Solution
A control system comprising an imaging unit and a process control unit that captures images of ladles, associates them with transfer cars and cranes, monitors their positions, estimates heat loss, and schedules crane movements to optimize energy use and reduce thermal losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID tags are used to monitor ladles, then ladle tracking is enabled, but the RFID tags break down due to high temperature and environmental conditions requiring frequent replacement
Solution Approach 1:
The patent extracts the tracking functionality from the harsh thermal environment by placing RFID tags on transfer cars rather than directly on ladles. The transfer cars operate in cooler zones and can be tracked without exposing the RFID tags to extreme temperatures, thereby extending tag service life while maintaining tracking reliability.
Solution Approach 2:
The transfer car serves as an intermediary between the ladle and the tracking system. Instead of directly tracking the ladle in the hot zone, the system tracks the transfer car that carries the ladle, using the transfer car as a mediator to overcome the thermal limitations of RFID tags.
2Temperature
If operators heat the melt higher to compensate for thermal loss, then the desired temperature at casting is achieved, but energy consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where RFID tags on transfer cars provide real-time location and timing data to a control system. The control system calculates actual thermal losses based on transport duration and temperature changes, then adjusts heating parameters for subsequent batches to minimize energy consumption while maintaining the required casting temperature.
Solution Approach 2:
The system performs preliminary calculations of thermal losses based on tracked ladle transport times and conditions. This allows operators to pre-determine the optimal heating amount needed before casting, avoiding excessive heating and reducing energy consumption while ensuring the molten metal reaches the caster at the correct temperature.
3Ease of operation
If ladles are monitored manually based on prior experience, then crane operations can be coordinated, but thermal losses increase due to delayed response and suboptimal scheduling
Solution Approach 1:
The patent replaces manual monitoring and coordination with an automated electronic tracking system using RFID tags and a control system. This substitution enables real-time data collection on ladle positions and transport times, allowing for optimized crane scheduling that minimizes thermal losses while simplifying operational coordination.
Solution Approach 2:
The tracking system enables self-service optimization where the control system automatically calculates thermal losses and determines optimal crane scheduling based on real-time RFID data. This reduces reliance on manual experience-based decisions and automatically minimizes energy losses through data-driven scheduling.
Data Source
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AI summary
A control system and method for monitoring location of a ladle in a metallurgical facility (100). The Control System uses an imaging unit along with first set of sensors present on the transfer cars and second set of sensors present on the cranes to track the movement of ladles. A thermal heat model using parameters of the molten metal, properties of the ladle and time elapsed in transportation of ladle from one end to the other end of the track estimates the amount of heat lost in the ladle. The real time tracking of ladles and Crane job scheduling enables the Ladle transfer time to be minimized and avoid heat loss.