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The laminar cooling process is an important procedure in hot steel strip rolling. The spatial distribution and the drop curve of the strip temperature are crucial for the production and the quality of the steel strip. Traditionally, lumped parameter methods are often used for the modeling of the laminar cooling process, making it difficult to consider the impact of the variation of state variables and related parameters on the system, which seriously affect the stability of the steel strip quality. In this paper, a modeling and monitoring method with a time-space nature for the laminar cooling process is proposed to monitor the spatial variation of the strip temperature. Firstly, the finite-dimensional model is obtained by time-space separation to describe the temperature variation of the steel strip. Next, a global model is constructed by using the multi-modeling integration method. Then, a residual generator is designed to monitor the strip temperature where the statistics and the threshold are calculated. Finally, the superiority and reliability of the proposed method are verified by the actual-process data of the laminar cooling process for hot steel strip rolling, and different types of faults are detected successfully.
Laminar Cooling System refers to a cooling technology used during hot rolling to control and uniformly cool steel strips. Specifically, it sprays cooling water onto the strip surface through a series of headers (upper and lower headers) to achieve even cooling. This system requires precise control over water flow rate, pressure, and spray positioning to ensure consistent cooling effects across varying strip temperatures.
Key features include:
Dynamic Adjustment: Real-time modification of header activation status and spray height based on strip temperature and thickness changes to maintain consistent cooling.
Valve Responsiveness: Pneumatic diaphragm valve banks on headers must respond rapidly to commands to minimize cooling deviations caused by delays.
Flow Balancing: Ensures equilibrium between water supply and return systems, preventing low flow or interruptions due to insufficient return capacity.
Side-Spray Capability: Side-spray designs swiftly purge residual water from the strip surface, enabling efficient water replacement and enhancing cooling efficiency.
System Levelness: The horizontality of upper headers directly affects water flow consistency, requiring strict calibration of flange levels to prevent strip buckling.
Improvement Measures: Optimizing valve structures, adjusting manual ball valves in supply pipes, and fine-tuning valve openings to address system nonlinearity and boost cooling precision.
This system is critical in steel rolling, as it directly impacts final strip quality, coiling temperature accuracy, and production efficiency.
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