Hot-Rolled Steel Cooling Nozzle Guide Overflow Prevention
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Solution Overview
Problem
Existing cooling apparatuses for hot-rolled steel sheets face challenges in efficiently discharging high-volume density cooling water, leading to overflow issues, reduced cooling capability, and non-uniform cooling due to retained water accumulation, which affects the mechanical properties of the steel sheets.
Innovation Solution
A cooling apparatus with a specific configuration of cooling nozzles and upper surface guides, where the distance between the pass line and the upper surface guide is optimized to ensure efficient water discharge, allowing for a high volume density of cooling water to be sprayed and preventing overflow, thereby maintaining high cooling capability and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling water volume density is increased to enhance cooling capability, then the cooling capability is improved, but the retained water accumulates and reaches the upper surface guide causing overflow
Solution Approach 1:
The discharge path is segmented into multiple components: discharge holes in the upper surface guide, side discharge portions, and lower surface discharge. This segmentation allows distributed water discharge throughout the cooling apparatus, preventing accumulation and overflow while maintaining high cooling water volume density
Solution Approach 2:
Water discharge is extended from a single-plane approach to three-dimensional discharge throughout the cooling apparatus. The discharge holes are positioned at specific heights, and side discharge portions extend laterally, creating multiple discharge dimensions that effectively manage water flow and prevent overflow
2Temperature
If a large volume of cooling water is sprayed per unit area to cool the steel sheet quickly, then the cooling capability is enhanced, but jet pressure decays due to thick retained water layer
Solution Approach 1:
Discharge holes are provided in the upper surface guide before the retained water can accumulate to a thickness that would decay jet pressure. This preliminary discharge action prevents the formation of a thick water layer, maintaining cooling water jet pressure even at high cooling water volume densities
3Temperature
If the upper surface guide is disposed at a lower position to avoid breaking the cooling nozzle, then the cooling capability is maintained, but retained water easily reaches the guide causing overflow
Solution Approach 1:
The upper surface guide is designed with discharge holes at specific local positions (heights) where water accumulation is most problematic. This localized discharge quality allows the guide to be positioned low for cooling effectiveness while preventing overflow at critical locations through targeted water discharge
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 solution enables the effective discharge of high-volume density cooling water, preventing overflow and ensuring uniform cooling of the steel sheet, which enhances the mechanical properties of the hot-rolled steel sheets by maintaining high cooling capability and preventing non-uniform cooling.
Implementation Method 1
capable of supplying cooling water from above a pass line toward the pass line
Implementation Method 2
rapidly cool a steel sheet after rolling
Data Source
AI summary
Provided is a cooling apparatus discharging water smoothly corresponding to increase of volume density of cooling water securing a high cooling capability. The apparatus disposed on downstream side from a row of hot finish rolling mill, supplying cooling water from above toward a pass line, includes a plurality of cooling nozzles arranged parallel in a pass line direction, and an upper surface guide disposed between the pass line and the cooling nozzles, wherein a predetermined relation is satisfied when defining: a volume density of cooling water sprayed as qm(m3/(m2·sec)); a pitch of the cooling nozzle in the pass line direction as L(m); a distance between a lower surface of the upper surface guide and the pass line as hp(m); a uniform cooling width as Wu(m); and a cross-sectional area of virtual flow path of discharging water flowing in a width direction of steel sheet as S(m2).