Metal Strip Pickling Control Using LIBS Oxide Measurement
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Solution Overview
Problem
Conventional cleaning methods for hot-rolled metal strips are inefficient and hazardous, as they rely on acid pickling, which consumes resources, poses health risks, and lacks precise control over oxide removal, leading to suboptimal cleaning results and material loss.
Innovation Solution
A cleaning plant equipped with laser-induced breakdown spectroscopy (LIBS) technology to measure oxide thickness and composition, allowing for precise adjustment of pickling parameters and reducing acid consumption by optimizing the cleaning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If acid pickling is used to remove oxide layers, then cleaning effectiveness is improved, but material loss increases and environmental harm worsens
Solution Approach 1:
The system performs preliminary measurement of oxide layer thickness and composition using LIBS technology before the pickling process. This allows the pickling parameters to be precisely adjusted according to the actual oxide conditions, preventing over-pickling and material loss while ensuring complete oxide removal.
Solution Approach 2:
The system dynamically adjusts pickling parameters (acid concentration, exposure time, temperature) based on real-time oxide layer measurements. By changing these parameters according to the measured oxide thickness and composition, the system achieves effective cleaning while minimizing material loss and acid consumption.
2Manufacturing precision
If conventional acid pickling is used, then oxide removal is achieved, but health risks and environmental harm increase
Solution Approach 1:
The system implements a feedback loop where LIBS measurement data on oxide layer characteristics continuously informs adjustments to pickling parameters. This closed-loop control ensures optimal cleaning effectiveness while minimizing acid consumption and exposure time, thereby reducing health risks and environmental impact.
Solution Approach 2:
The system transitions from static, fixed pickling parameters to dynamic, adaptive parameters that change in real-time based on measured oxide conditions. This dynamic adjustment allows the system to use the minimum necessary acid exposure to achieve complete oxide removal, reducing harmful effects.
3Ease of operation
If fixed pickling parameters are used, then process simplicity is maintained, but cleaning precision deteriorates
Solution Approach 1:
The system performs self-adjustment by automatically measuring oxide layer properties with LIBS and using this information to optimize pickling parameters without requiring manual intervention. This self-service capability maintains operational simplicity while achieving high cleaning precision through adaptive parameter adjustment.
4Reliability
If acid consumption is increased to ensure complete oxide removal, then cleaning reliability is improved, but cost and environmental impact worsen
Solution Approach 1:
The system performs preliminary measurement of oxide layer thickness and composition before pickling, allowing accurate determination of the minimum acid consumption required for complete oxide removal. This preliminary information enables reliable cleaning with optimized acid usage, avoiding both insufficient and excessive acid application.
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 solution enables precise measurement and removal of oxide layers, optimizing pickling conditions, reducing material loss, and enhancing safety and environmental sustainability by minimizing acid use and improving cleaning efficiency.
Implementation Method 1
a laser source, cooperating with a fiber optic spectrometer, defining a LIBS system (Laser Induced Breakdown Spectroscopy)
Implementation Method 2
a laser source, cooperating with a fiber optic spectrometer, defining a LIBS system (Laser Induced Breakdown Spectroscopy) also adapted to analyze the composition of the oxide and the concentration of the constituents of the oxide
Data Source
AI summary
A plant for cleaning rolled metal strips provided with a superficial layer of oxide, the plant comprising unwinding means for unwinding at least one coil of rolled strip and pickling means for pickling said rolled strip; wherein there are provided measuring means for measuring the thickness of the superficial layer of oxide, arranged between said unwinding means and said pickling means. A relating cleaning method is also claimed.