Continuous Annealing Strip Cooling Nozzle Control
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Solution Overview
Problem
Existing methods for controlling strip temperature in continuous annealing lines cannot effectively manage widthwise temperature distribution, leading to non-uniform cooling and resulting flatness defects in strips.
Innovation Solution
A method and apparatus utilizing widthwise temperature measurement and feedback/feedforward control techniques to adjust mist flow rates through lengthwise and widthwise nozzle blocks, ensuring uniform temperature control across the strip's width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional cooling methods are used in the rapid cooling section, then cooling efficiency is improved, but widthwise temperature uniformity deteriorates
Solution Approach 1:
The cooling system is segmented into multiple independent nozzle blocks arranged in the widthwise direction, with each block containing multiple nozzles that can be controlled separately. This segmentation allows different flow rates to be applied to different widthwise zones, enabling uniform temperature distribution across the strip width while maintaining high cooling efficiency
Solution Approach 2:
Each nozzle block is equipped with individual flow rate control mechanisms, allowing the cooling system to apply locally optimized cooling rates to different widthwise positions. The control system adjusts flow rates based on measured temperature differences across the width, ensuring each zone receives appropriate cooling to achieve overall temperature uniformity
2Device complexity
If simple cooling control is used, then device complexity is reduced, but temperature control precision deteriorates
Solution Approach 1:
Temperature sensors are installed in each nozzle block to measure the actual temperature of the strip at different widthwise positions. These measurements are fed back to the control system, which automatically adjusts the flow rates of individual nozzle blocks to eliminate temperature deviations, achieving precise temperature control through continuous feedback correction
Solution Approach 2:
The system uses the temperature measurements from the strip itself to automatically regulate its own cooling process. Each nozzle block self-adjusts its flow rate based on local temperature conditions, enabling the cooling system to maintain optimal temperature uniformity without requiring complex external intervention
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 minimizes flatness defects by achieving uniform widthwise temperature distribution and optimal cooling profiles, even in the rapid cooling section of continuous annealing lines.
Implementation Method 1
a plurality of sets of cooling nozzle blocks which is vertically disposed at front and rear sides of the strip (S) in order to control the temperature of the strip
Implementation Method 2
strip center temperature meters (231a, 231b) and widthwise temperature meters (233a, 233b) which respectively measure temperatures from a strip (S)
Data Source
AI summary
Provided are a method and apparatus for uniformly controlling the strip temperature of the rapid cooling section of a continuous annealing line. A plurality of sets of cooling nozzle blocks for controlling the strip temperature is installed at the front and back sides of the strip, and is divided into lengthwise flow control nozzle blocks and widthwise flow control nozzle blocks. Strip center temperature meters and widthwise direction temperature meters are installed at the intake and discharge sides of the rapid cooling section. Temperatures obtained using the strip center temperature meters and the width direction temperature meters are used to respectively control the spraying of mist for the lengthwise flow control nozzle blocks and the widthwise flow control nozzle blocks in order to uniformly control the strip temperature and minimize changes in the flatness of the strip. The widthwise temperature meters at the intake and discharge ends of the rapid cooling section of the continuous annealing line are used to detect the temperature. Feedback/feedforward control technique can be used to uniformly control the widthwise temperature of the strip through flow rate control over mist sprayed in the widthwise direction of the rapid cooling section.