Immersion Nozzle Segmented Flow Distribution for Slab Casting
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Solution Overview
Problem
Conventional immersion nozzles face challenges in achieving stable flow rate distribution to multiple discharge holes while reducing discharge flow velocity, leading to uneven flowing movements in the mold and potential surface defects in slabs.
Innovation Solution
The immersion nozzle features a unique internal structure with two regions divided by a plane, an internal barrier for distributing molten steel, branch flow passages, and distribution blocks to stabilize flow rate distribution and correct unevenness between regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple discharge holes are used to reduce discharge flow velocity, then the discharge flow velocity is reduced, but the flow rate distribution to multiple discharge holes becomes unstable
Solution Approach 1:
The discharge portion is divided into multiple discharge holes (typically 3-5 holes) arranged in a specific pattern. Each discharge hole receives flow through dedicated flow passages that are segmented by internal barriers, allowing independent flow control to each hole while maintaining overall stable distribution
Solution Approach 2:
Different regions of the discharge portion are designed with different flow passage configurations. The flow passages are optimized locally to ensure uniform flow distribution to each discharge hole, with specific attention to the geometry and positioning of each passage to compensate for potential flow imbalances
2Speed
If discharge hole area is enlarged to reduce discharge flow velocity, then the discharge flow velocity is reduced, but the flow rate distribution becomes uneven
Solution Approach 1:
The total discharge area is divided into multiple discrete discharge holes rather than one large hole. This segmentation allows each hole to be optimized for uniform flow while collectively providing the desired velocity reduction through increased total area
Solution Approach 2:
The discharge holes are arranged in a two-dimensional pattern (e.g., triangular or rectangular arrangement) rather than a single line, optimizing the spatial distribution of flow and improving flow rate uniformity across the discharge face
3Reliability
If internal barrier is added to distribute flow to multiple regions, then the flow distribution is improved, but the device complexity increases
Solution Approach 1:
The internal barrier is designed as a simple partition wall that divides the flow passage into distinct regions leading to different discharge holes. This minimal segmentation achieves flow distribution without complex internal structures
Solution Approach 2:
The internal barrier serves multiple functions simultaneously: it distributes flow to different regions, defines flow passage boundaries, and acts as a structural support element. This multi-functionality reduces the need for additional separate components
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 design effectively suppresses unevenness in the flowing movement of molten steel in the mold, enhancing the stability of the casting operation and reducing the likelihood of surface defects in slabs.
Implementation Method 1
an internal barrier that is disposed at the center in the width direction and that distributes the molten steel supplied from the tundish to each of the regions
Implementation Method 2
a branch flow passage through which a branch flow, which is the molten steel that has been distributed by the internal barrier, flows
Data Source
AI summary
An immersion nozzle for discharging molten steel supplied from a tundish into a mold for continuous casting of a slab includes a discharge portion that supplies the molten steel to the mold, wherein the immersion nozzle includes two regions divided by a plane in a thickness direction, the plane passing through an axial center, the discharge portion includes: a bottom portion; and a side wall that extends in a height direction from an outer edge of the bottom portion, four discharge holes are formed in the discharge portion, two discharge hole are arranged side by side in a width direction in each of the regions in the bottom portion of the discharge portion.