Anode Pin Sensor Matrix for Electric Arc Furnace Bottom Electrode Monitoring
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Solution Overview
Problem
Current methods for assessing the conditions of the bottom electrode structure in a DC electric arc furnace rely on single-point temperature measurements, which are inadequate for comprehensive evaluation and optimization, limiting the integrity and longevity of the electrode structure and the furnace's productivity.
Innovation Solution
A sensor system with multiple temperature sensors and current sensors placed at discrete locations along the anode pins, along with a controller and display device, to monitor and control the performance of the bottom electrode and electric arc deflection, providing detailed temperature and current data for improved assessment and optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-point temperature measurement is used along each anode electrode pin, then the measurement system remains simple, but the assessment of bottom electrode structure conditions becomes inadequate
Solution Approach 1:
The patent divides the temperature measurement into multiple discrete points along each anode electrode pin. Instead of a single measurement, the system implements a plurality of temperature sensors positioned at different locations (e.g., embedded in the pin at various heights, contactless sensors at different positions), creating a segmented measurement approach that comprehensively captures the temperature profile along the electrode pin length.
Solution Approach 2:
The patent transitions from one-dimensional single-point measurement to multi-dimensional spatial measurement. By placing sensors at multiple locations along the length and potentially radial dimensions of the electrode pins, the system creates a distributed measurement network that captures temperature distribution in multiple spatial dimensions, providing comprehensive assessment of heat flow patterns.
2Loss of information
If multiple temperature sensors and current sensors are deployed at discrete locations, then comprehensive temperature and current data is obtained, but the device complexity increases
Solution Approach 1:
The patent implements a multi-functional sensor system where temperature sensors (both contact and contactless types) and current sensors work together to provide comprehensive monitoring. The system integrates multiple sensing capabilities into a unified measurement network that simultaneously captures temperature distribution and current flow characteristics, enabling comprehensive heat flow and current distribution analysis through coordinated multi-parameter measurement.
Solution Approach 2:
The patent introduces signal processing and data integration systems that act as intermediaries between the distributed sensors and the control system. These intermediaries collect, process, and synthesize data from multiple temperature and current sensors, transforming raw sensor signals into meaningful information about heat flow patterns and current distribution, thereby managing the complexity of the distributed sensor network.
3Reliability
If comprehensive sensor data is collected from multiple locations, then better assessment and optimization of bottom electrode is achieved, but the system complexity and cost increase
Solution Approach 1:
The patent implements a feedback-based monitoring system where comprehensive temperature and current data from multiple sensor locations are continuously collected and analyzed. This feedback information is used to assess the condition of the bottom electrode structure, predict integrity issues, and optimize electrode performance. The system provides real-time or near-real-time feedback on electrode pin temperature profiles and current distribution, enabling proactive maintenance and operational optimization.
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
Enhances the evaluation of the bottom electrode structure by providing multiple-point temperature and current measurements, enabling better heat flow and current distribution analysis, which improves the predictability and longevity of the electrode structure and the furnace's performance.
Implementation Method 1
at least two temperature sensors at spaced apart locations along each one of a distributed select group of elongated anode pins for providing electrical signals corresponding to measurements of anode pin temperatures
Implementation Method 2
a current sensor responsive to the electrical current flowing through each elongated anode pin of the distributed select group of elongated anode pins for providing a corresponding electrical signal
Implementation Method 3
An upper electrode which generally is graphite acts as a negative terminal, i.e. a cathode (−) and generates the high temperature electric arc within the furnace
Implementation Method 4
The current passing through the electric arc makes its way through the charged scrap and eventually to the pool of liquid steel above the bottom electrode
Data Source
AI summary
A sensor system for monitoring and controlling the performance of the bottom electrode and the deflection of an electric arc in an electric steel making furnace includes an organized matrix of anode pins interspersed with refractory material and extending toward an electrically conductive plate secured to distal ends of the anode pins. A sensing device includes two temperature sensors at spaced apart locations along each of a distributed select group of anode pins for providing corresponding electrical signals and a current sensor responsive to electrical current flowing through the anode pins of the distributed select group of anode pins for providing a corresponding electrical signal. A controller responsive to the electrical signals derived at the anode pins of the select group operates the power supply and a display for monitoring the electrical performance of the elongated anode pins for heating by the electric arc in the furnace.