Hot-Rolled Strip Temperature Estimation Under Multi-Regime Cooling
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Solution Overview
Problem
Existing methods for determining the temperature of hot-rolled steel strips in hot rolling installations are not sufficiently accurate, leading to variations in cooling and degradation of steel strip mechanical properties due to disturbances from upstream equipment.
Innovation Solution
A method using an electronic determination device that acquires temperature measurements and estimates heat flux based on a thermal model accounting for air cooling, coolant header cooling, and remaining coolant cooling, including impingement and parallel flow cooling regimes, to accurately compute strip temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a thermal model is used to determine strip temperature, then temperature prediction capability is provided, but measurement precision is insufficient
Solution Approach 1:
The patent introduces an optical pyrometer as an intermediary measurement device to directly measure strip temperature at multiple positions. This optical measurement system acts as a mediator between the thermal model and actual temperature, providing precise temperature data that validates and corrects the thermal model predictions, thereby resolving the insufficiency of model-based temperature determination accuracy
Solution Approach 2:
The patent implements a feedback mechanism where optical pyrometer measurements of actual strip temperature are continuously fed back to adjust and refine the thermal model parameters. This closed-loop feedback system allows the thermal model to self-correct and improve its temperature prediction accuracy over time, transforming the initial open-loop model into a reliable adaptive system
2Productivity
If upstream equipment disturbances are present, then productivity is maintained, but temperature stability deteriorates
Solution Approach 1:
The patent implements dynamic temperature control by continuously adjusting cooling apparatus parameters based on real-time strip temperature measurements from optical pyrometers. The system dynamically adapts cooling intensity and distribution to compensate for upstream disturbances while maintaining constant production speed, transforming static thermal processes into dynamic responsive systems that preserve both productivity and temperature stability
Solution Approach 2:
The patent changes key process parameters including coolant flow rate, cooling zone temperatures, and pyrometer measurement frequencies in response to detected temperature variations. These parameter adjustments are made dynamically during operation to counteract upstream equipment disturbances, maintaining temperature stability without reducing production throughput
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 provides a more accurate and robust temperature determination, reducing temperature errors and improving steel strip quality by effectively modeling various cooling mechanisms within the hot rolling process.
Implementation Method 1
an air cooling corresponding to the cooling of the strip portion by air radiation and air convection
Implementation Method 2
an air cooling corresponding to the cooling of the strip portion by air radiation and air convection
Implementation Method 3
an impingement cooling corresponding to the cooling of the strip portion by coolant impinging from the at least one coolant header
Implementation Method 4
a parallel flow cooling corresponding to the cooling of the strip portion by coolant falling at a given distance from the at least one coolant header
Implementation Method 5
a remaining coolant cooling corresponding to the cooling of the strip portion by coolant remaining on the strip portion after the strip portion passed under the at least one coolant header
Data Source
AI summary
A method for determining the temperature of a metal strip (1) inside a cooling apparatus (4) of a hot rolling installation is implemented by an electronic device (12). This method includes acquiring a temperature measure of a strip portion at a current time instant; estimating, at the current time instant, a heat flux extracted from the strip portion inside the cooling apparatus according to a thermal model, and computing a strip portion temperature at a next time instant from the acquired temperature measure and the estimated extracted heat flux. The thermal model models an air cooling of the strip portion, a coolant header cooling of the strip portion by a coolant header and a remaining coolant cooling of the strip portion, wherein for the coolant header cooling the model models both an impingement cooling of the strip portion and a parallel flow cooling of the strip portion.