Molten Metal Bath Temperature Sensing Under Furnace Rocking
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Solution Overview
Problem
Existing methods for determining the temperature of a molten metal bath in a metallurgical vessel, particularly in an electric arc furnace, face challenges due to the constant movement of the vessel during the metal-making process, which affects the immersion depth of the optical cored wire and leads to inconsistent and inefficient temperature measurements.
Innovation Solution
A method and system that utilize a set of data correlating furnace inclination values to specific measurement profiles, allowing for accurate temperature determination by adjusting the immersion depth and feeding velocity of the optical cored wire based on the vessel's inclination, ensuring consistent and efficient consumption of the wire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical cored wire is immersed deeper into the molten metal bath to ensure accurate temperature measurements, then the measurement precision is improved, but the consumption of optical cored wire increases due to flotational forces
Solution Approach 1:
The patent applies dynamics by making the optical cored wire movable rather than fixed. The wire is fed through a feeding device that can adjust its position dynamically. During furnace rocking, the feeding device compensates for inclination changes by adjusting the wire's immersion depth in real-time, maintaining both measurement accuracy and reduced consumption through continuous positional adaptation.
2Device complexity
If the optical cored wire is installed in a fixed manner at a non-central position, then the device complexity is reduced, but the measurement precision deteriorates due to varying immersion depth during furnace rocking
Solution Approach 1:
The patent transforms the fixed installation into a dynamic system. The optical cored wire is coupled with a feeding device that can move the wire axially. During furnace rocking, the feeding device detects inclination changes and adjusts the wire's position dynamically, maintaining constant immersion depth despite the simple fixed installation structure.
Solution Approach 2:
The patent implements feedback control through the feeding device that monitors furnace inclination (directly or indirectly) and adjusts the optical cored wire's position accordingly. This closed-loop feedback mechanism ensures that the wire maintains optimal immersion depth throughout the rocking cycle, preserving measurement precision without complicating the installation.
3Productivity
If the furnace rocking is performed to homogenize the metal melt, then the productivity is improved, but the measurement precision deteriorates due to constantly changing distance between the optical cored wire and molten metal surface
Solution Approach 1:
The patent resolves this contradiction by making the measurement system dynamic. While the furnace rocks to homogenize the melt (improving productivity), the feeding device simultaneously adjusts the optical cored wire's position to maintain constant immersion depth. This dynamic compensation allows continuous accurate temperature measurements throughout the rocking process without interrupting metal homogenization.
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 method enables reliable and accurate temperature measurements in a constantly moving metallurgical vessel by maintaining a constant immersion depth and reducing wire consumption, thereby improving data quality and efficiency.
Implementation Method 1
the optical fiber can convey thermal radiation received from the molten metal to a detector, e.g. a pyrometer
Data Source
AI summary
The present invention relates to a method and a system for determining a temperature value of a molten metal bath. The method according to the invention has been proven to be especially suitable for installations of metallurgical vessels which are constantly moved during the metal making process.