Laminar Cooling Control for Uniform Hot-Rolled Strip Temperature
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Solution Overview
Problem
Existing methods for controlling transverse temperature during laminar cooling of hot-rolled strips are inadequate in achieving uniform cooling, leading to flatness defects such as buckling due to residual stress caused by non-uniform temperature distribution.
Innovation Solution
A method involving the division of the strip's transverse area into a middle area and edge areas, with specific heat transfer coefficient curves designed for each area to achieve a saddle-shaped distribution, thereby ensuring uniform transverse cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform water cooling is applied across the strip width, then the cooling process is simple to implement, but non-uniform transverse temperature distribution occurs due to edge supercooling and water flow accumulation
Solution Approach 1:
The patent applies different heat transfer coefficient curves to different transverse zones of the strip. The water cooling heat transfer coefficient is divided into multiple zones (edge zone, intermediate zone, center zone) with distinct coefficient characteristics. Edge zones receive lower cooling coefficients to compensate for supercooling, while the center receives higher coefficients to enhance cooling effectiveness, achieving uniform transverse temperature distribution through localized cooling differentiation.
Solution Approach 2:
The patent segments the transverse width of the strip into multiple independent cooling zones (typically 3-5 zones across the width). Each zone is assigned its own heat transfer coefficient curve and can be controlled independently. This segmentation allows precise control of cooling intensity in each zone to counteract the natural tendency toward edge supercooling and achieve uniform temperature across the entire strip width.
2Manufacturing precision
If cooling intensity is optimized through equipment parameter adjustment, then cooling effectiveness improves, but the transverse temperature non-uniformity persists due to inherent water flow distribution patterns
Solution Approach 1:
The patent fundamentally changes the heat transfer coefficient parameter across the transverse width rather than merely adjusting equipment parameters like nozzle spacing or water pressure. By implementing a spatially varying heat transfer coefficient curve h(x) that decreases from the center toward the edges, the patent directly addresses the temperature non-uniformity issue. This parameter change approach allows precise control of cooling intensity distribution to achieve uniform transverse temperature while maintaining high overall cooling effectiveness.
3Ease of operation
If empirical formulas and data are used for equipment parameter debugging, then the process setup is straightforward, but the cooling distribution and heat transfer coefficient curve are not thoroughly optimized
Solution Approach 1:
The patent replaces empirical trial-and-error parameter adjustment with a theoretical heat transfer model. By establishing a mathematical relationship between water cooling parameters and heat transfer coefficients, and using numerical methods to calculate optimal heat transfer coefficient curves, the patent achieves scientifically optimized cooling distribution. This substitution of empirical methods with theoretical modeling enables precise control of transverse temperature uniformity while maintaining ease of operation through standardized calculation procedures.
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 effectively homogenizes the transverse temperature of the hot-rolled strip during laminar cooling, reducing flatness defects and ensuring uniform cooling across the strip.
Implementation Method 1
the cooling water of the upper header tends to accumulate on the upper surface of the strip and flows from the middle area to the edge area of the strip
Implementation Method 2
the non-uniform distribution of the transverse temperature of strip during the laminar cooling is caused by three factors
Data Source
AI summary
Some embodiments of the disclosure provide a method for homogeneously controlling a transverse temperature during laminar cooling of a hot-rolled strip. In an embodiment, a mathematical model of middle convexity cooling in a water volume is established by designing different types of middle convexity water cooling heat transfer coefficient curves. Process procedures and equipment parameters of the hot-rolled strip during the laminar cooling are considered to restore the actual situation on site. Through finite element calculation, an optimal middle convexity water cooling heat transfer coefficient curve is obtained. Process parameters corresponding to middle convexity water volume distribution during the laminar cooling (a water flow density) are further obtained to guide a water volume control process.