Rectangular Descaling Nozzle for Low-Pressure Slab Cleaning
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Solution Overview
Problem
High energy consumption and reduced descaling quality due to high water pressure requirements in conventional descalers, which also lead to increased energy consumption and temperature losses in the slab or pre-strip during the descaling process.
Innovation Solution
A method utilizing a rectangular or slit-shaped nozzle with a partially arcuate course, producing a compact, high-speed water jet that covers the entire width of the slab, with adjustable nozzle distance and angle, and a filter element to maintain descaling efficiency while reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high water pressure is used in conventional descalers, then descaling quality is improved, but energy consumption increases significantly
Solution Approach 1:
The invention changes the pressure parameter from conventional high pressure (380 bar) to low pressure (5-50 bar) by fundamentally altering the nozzle geometry from circular to rectangular/slot-shaped, transforming the water jet from a dispersed spray to a concentrated strip-shaped jet that maintains high impact force at low pressure
Solution Approach 2:
The rectangular nozzle outlet creates a localized high-velocity water jet with concentrated kinetic energy directed precisely at the scale deposits, rather than dispersing energy across multiple spray directions, thereby achieving effective descaling with minimal energy input
2Manufacturing precision
If high water pressure is applied, then descaling effectiveness is improved, but temperature losses of the slab increase
Solution Approach 1:
The invention changes the pressure parameter from conventional high pressure (380 bar) to low pressure (5-50 bar) by fundamentally altering the nozzle geometry from circular to rectangular/slot-shaped, transforming the water jet from a dispersed spray to a concentrated strip-shaped jet that maintains high impact force at low pressure
Solution Approach 2:
The invention extracts only the essential function of high-impact water delivery by using a rectangular nozzle that produces a focused jet, eliminating the need for high-pressure systems that cause excessive cooling, thereby separating the descaling effectiveness from high pressure dependency
3Area of stationary object
If multiple nozzles are arranged side by side to cover slab width, then coverage is improved, but device complexity and cost increase
Solution Approach 1:
The invention merges the function of multiple nozzles into a single rectangular nozzle by extending the nozzle outlet in the width direction, creating one continuous slot-shaped opening that delivers a strip-shaped jet across the entire slab width, thereby eliminating the need for multiple separate nozzles and their associated mounting structures
Solution Approach 2:
The invention transitions from a one-dimensional array of circular nozzles to a two-dimensional rectangular nozzle outlet that spans the width direction, transforming the water delivery from multiple point sources to a continuous linear source that covers the entire width in a single element
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
Achieves a good descaling result with significantly lower energy requirements and reduced temperature losses, allowing for efficient descaling across the width of the slab with fewer nozzles and lower pressure, thus minimizing cooling effects and energy usage.
Implementation Method 1
The flow conditions at the outlet of the rectangular nozzle are designed and dimensioned to produce a compact, relatively smooth jet with a high water exit velocity
Implementation Method 2
water is supplied to the nozzle at a pressure between 5 bar and 50 bar
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a method for cleaning and/or descaling a slab or a preliminary strip (1) by means of a descaling device (2), wherein the descaling device (2) has at least one nozzle (3), through which water under pressure (p) is discharged onto the surface of the slab or of the preliminary strip (1). In the method according to the invention, in order to achieve a good descaling result in an energy-saving manner, the outlet (4) of the nozzle (3) is rectangular, or is slit-shaped and has an arcuate course at least in some sections, in a direction normal (N) to the surface of the slab or of the preliminary strip (1), such that the water is discharged as a continuously strip-shaped jet (5) across the entire width (B) of the slab or of the preliminary strip (1), wherein the width (b) of the outlet (4) of the nozzle (3) in a conveying direction (F) of the slab or of the preliminary strip (1) is selected between 0.2 mm and 1.5 mm, wherein the water is fed to the nozzle (3) at a pressure between 5 bar and 50 bar and wherein the distance (a) between the outlet (4) of the nozzle (3) and the surface of the slab or of the preliminary strip (1) is selected between 8 mm and 50 mm. The invention further relates to a descaling device.