Aluminium Electrolysis Cell Surface Profile Measurement
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Solution Overview
Problem
Current methods for measuring cathode wear profile and side ledge profile in aluminum electrolysis cells are inaccurate and cannot be performed in real-time due to high temperatures and electromagnetic interference, limiting the ability to predict cell lifespan and optimize energy efficiency.
Innovation Solution
An apparatus with a position determining system comprising a mobile and stationary member, and a heat-resistant lance with a ball-end tip, allowing for precise measurement of cathode and side ledge surfaces without direct contact, using optical means to determine the lance tip's position and employing materials like stainless steel and graphite-based materials for resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If direct contact measurement methods are used in high-temperature electrolysis cells, then measurement capability is achieved, but measurement precision deteriorates due to temperature and electromagnetic interference
Solution Approach 1:
The patent introduces a heat-resistant lance made of graphite-based material as an intermediary tool. The lance tip contacts the cathode surface while the measurement system remains outside the high-temperature zone, allowing accurate measurements without direct exposure of sensitive components to extreme conditions that would compromise precision.
Solution Approach 2:
The patent replaces traditional mechanical contact measurement systems with an optical measurement system that uses light to determine the position of the lance tip relative to the cathode surface. This substitution eliminates the influence of electromagnetic interference and high temperatures on the measurement components, maintaining high precision while enabling measurement capability in harsh environments.
2Productivity
If measurement is performed in real-time during electrolysis, then productivity is improved through continuous monitoring, but device complexity increases due to heat-resistant components and optical systems
Solution Approach 1:
The heat-resistant lance serves multiple functions: it acts as a mechanical support structure, a heat shield protecting the measurement system from high temperatures, and a positioning reference for the optical measurement system. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while enabling continuous real-time monitoring during electrolysis operations.
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
Enables fast and accurate measurement of surface profiles, reducing the influence of high temperatures and electromagnetic fields, allowing for continuous monitoring of cell wear and improving energy efficiency by providing precise data on cathode and side ledge wear.
Implementation Method 1
the stationary member and the mobile member are adapted to determine the position of the reference points with the help of optical means
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
The invention relates to an apparatus (10) for deternnining the surface profiles, in particular the cathode wear profile (22) or the side ledge(s) profile, of an aluminium electrolysis cell, which is filled with an aluminium melt (5) and has side ledge(s) (6a), comprising a position determining system with a mobile system member (11) and a stationary system member (14) and a lance (16) with a heat resistant lance tip (19) for immersing into the melt (5) onto cathode or the side ledge(s) surface of the cell, the mobile member (11) being attached to the lance (16) and the stationary member (14) being adapted for determining a position of the lance tip (19) by determining a position of the mobile member (11). Furthermore, the invention relates to a method for determining the surface profiles, in particular the cathode wear profile (22) or the side ledge(s) profile, in an aluminium electrolysis cell by employing said apparatus (10), immersing the lance tip (19) of the apparatus (1) into the aluminium melt (5) onto cathode or side ledge surface (6a) of the cell and determining the position of the lance tip (19) as the height of the cathode (1) or of the side ledge (6a) at this position in the cell.