RF Antenna Embedded in Refractory Material for Vessel Wall Thickness Measurement
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Solution Overview
Problem
Current methods for evaluating the status of refractory materials in metallurgical vessels, such as furnace walls, face challenges with signal loss and spurious reflections due to high temperatures and conductive materials, making it difficult to accurately measure thickness and erosion profiles, and detect flaws, which leads to uncertain maintenance scheduling and increased costs.
Innovation Solution
An apparatus and method using embedded or positioned antennas within the refractory material to transmit and receive radiofrequency signals, processing the scattered signals to determine the thickness, erosion profile, and presence of flaws, allowing for remote evaluation and improved maintenance planning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microwave signals are transmitted from outside the furnace at high frequency bands to measure furnace wall thickness, then measurement capability is provided, but signal losses increase significantly
Solution Approach 1:
The patent introduces an intermediary substance (coupling agent or water layer) between the antenna and the refractory material to improve signal transmission. This intermediary reduces the impedance mismatch and minimizes signal reflections, allowing microwave signals to penetrate the refractory material more effectively with reduced loss.
Solution Approach 2:
The patent replaces mechanical contact-based thickness measurement methods with electromagnetic wave-based measurement. By using microwave signals that can penetrate the refractory material, the system eliminates the need for physical access to the inner surface while achieving accurate thickness measurement through signal transmission and reflection analysis.
2Measurement precision
If sensors are placed close to the refractory material surface to evaluate inner surface status, then measurement accuracy improves, but spurious signal reflections increase
Solution Approach 1:
The coupling agent or water layer acts as an intermediary that reduces spurious reflections by providing a gradual transition in electromagnetic impedance between the antenna and the refractory material. This minimizes unwanted reflections from the air-refractory interface while allowing the signal to reach the inner surface for accurate evaluation.
Solution Approach 2:
The system applies a coupling substance to the refractory material surface before placing the antenna, preparing the surface in advance to reduce reflections. This preliminary action ensures optimal signal transmission conditions are established before measurement begins.
3Ease of operation
If external evaluation systems are used to monitor refractory material, then remote monitoring is enabled, but the system becomes ineffective when surrounded by conductive structures
Solution Approach 1:
The patent uses a coupling agent as an intermediary that enables signal transmission even in the presence of conductive structures. The coupling substance creates a controlled transmission path that is less susceptible to interference from surrounding conductive materials, maintaining measurement reliability in challenging environments.
Solution Approach 2:
The system transitions from external signal transmission (through air) to a hybrid approach where signals are transmitted through a coupling medium that is in direct contact with the refractory material. This dimensional change in the transmission path allows the system to bypass the blocking effect of surrounding conductive structures.
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
This approach enables accurate estimation of refractory material status, extending the operational life of vessels, reducing the risk of leaks and damage, and optimizing maintenance schedules, thereby minimizing production disruptions and costs.
Implementation Method 1
transmitting at least one RF signal into an area of interest of the material under evaluation and receiving at least one RF signal after having impinged in such area
Data Source
AI summary
Disclosed is an apparatus and method for evaluating a status of a refractory material in metallurgical vessels, including furnaces and ladles, wherein an external structure at least partly surrounding the refractory material impairs the propagation of radiofrequency signals. The apparatus and method are operative to identify flaws and determine the erosion profile and thickness of refractory material and the level or rate of penetration of molten material into the refractory material, using radiofrequency signals. The apparatus comprises an antenna embedded in the refractory material or positioned inside the chamber of the vessel designed to collect data associated with the propagation of radiofrequency signals transmitted by the antenna into the refractory material. Moreover, signal processing techniques allow determining the status of the internal wall of the vessel due to operational wear, age, and presence of flaws, cracks, corrosion, and erosion to improve the operational life and maintenance of the vessel.