Spray Nozzle Arrangement for Uniform Hot Steel Plate Cooling
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Solution Overview
Problem
Existing methods for cooling hot steel plates using spray nozzles often result in uneven cooling distribution, leading to shape defects and residual stress in steel materials, as the cooling ability varies significantly across the surface, particularly between the centers and peripheries of spray regions.
Innovation Solution
The method involves arranging spray nozzles such that the integrated impact pressure of cooling water in the processing direction is within 20% of the highest value in the direction perpendicular to processing, using multiple types of nozzles with varying water amounts and spray regions, and enabling mixed spraying of water and air to achieve uniform cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional spray nozzles are arranged in a line with uniform nozzle pitch to spray uniform amounts of water in the width direction, then the water distribution becomes uniform, but the cooling ability becomes higher at the center compared with the peripheries, resulting in uneven cooling
Solution Approach 1:
The patent applies local quality by varying the nozzle pitch and water spray amounts across different regions (center and periphery) of the steel plate width. Specifically, the nozzle pitch is made larger at the periphery than at the center, and water spray amounts are adjusted to compensate for the lower impact pressure at peripheral regions, thereby achieving uniform cooling ability across the entire width despite the non-uniform geometric arrangement
Solution Approach 2:
The patent changes multiple parameters including nozzle pitch, water spray amount, and impact pressure distribution to achieve uniform cooling. By adjusting these parameters differently at the center and periphery regions, the system compensates for the natural variation in cooling ability and achieves overall uniform cooling across the steel plate width
2Manufacturing precision
If multiple types of nozzles with different water amounts and spray regions are used, then uniform cooling can be achieved, but the device complexity increases
Solution Approach 1:
The patent segments the nozzle system into different regions (center and periphery) with different nozzle configurations. By dividing the cooling system into zone-specific subsystems, each optimized for its local conditions, the patent achieves uniform overall cooling while managing complexity through modular regional design rather than requiring complete redesign of the entire nozzle array
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 ensures a uniform cooling distribution across the steel plate, maintaining the lowest cooling ability within 10% of the highest ability, thereby reducing shape defects and residual stress, and allowing for a broad range of water amount adjustments.
Implementation Method 1
arranging spray nozzles so that a value of an n power of the impact pressures of the cooling water on the cooling surface integrated in the processing direction between pairs of constraining rolls becomes within −20% of the highest value
Data Source
AI summary
The present invention relates to a method of arranging and setting spray nozzles in a cooling apparatus comprising a plurality of pairs of constraining rolls for constraining and conveying a hot steel plate and one or more lines of spray nozzles between the pair of constraining rolls, each line having a plurality of spray nozzles and is disposed in a direction perpendicular to processing, and to the cooling apparatus and the method of cooling. The invention is characterized in that the spray nozzles are arranged such that a distribution of values ∫Pn between two edges of the steel plate in the direction perpendicular to processing is not less than 80% of its highest value, with P being cooling water impact pressure on the cooling surface, ∫Pn being the value of n power of P integrated in the processing direction between the pairs of constraining rolls, and 0.05≦n≦0.2.