Tundish Impact Pad Latitudinal Wall Flow Control
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Solution Overview
Problem
Existing impact pads in tundishes for molten steel continuous casting fail to adequately control turbulence, leading to uneven flow, short-circuiting, and inadequate segregation of slag and impurities, which affects the quality of steel casting.
Innovation Solution
A refractory impact pad design featuring a base with an upwardly facing surface and a wall extending around its periphery, including a latitudinal and longitudinal portion with an inwardly extending protrusion, creating a flow channel that minimizes flow velocity variations and promotes uniform residence time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional impact pads are used to redirect molten steel flow, then turbulence is reduced to some extent, but flow uniformity and residence time distribution remain inadequate
Solution Approach 1:
The impact pad is divided into multiple functional zones: an impact surface for initial flow redirection, a latitudinal wall portion for horizontal flow control, a longitudinal wall portion for vertical flow guidance, and an inwardly extending feature that creates a flow channel. This segmentation allows each zone to address specific flow characteristics, achieving superior overall flow uniformity compared to conventional single-zone designs.
Solution Approach 2:
Different portions of the impact pad are designed with different geometries and orientations to address local flow requirements. The latitudinal portion handles horizontal flow redirection, the longitudinal portion manages vertical flow, and the inwardly extending feature creates localized flow channels. This localized optimization ensures uniform flow distribution throughout the tundish.
2Ease of manufacture
If impact pad design is simplified, then manufacturing is easier, but ability to control residence time uniformity deteriorates
Solution Approach 1:
The impact pad design incorporates three-dimensional features including a latitudinal wall portion, a longitudinal wall portion, and an inwardly extending feature that creates flow channels in multiple directions. This multi-dimensional geometry allows precise control over flow paths and residence time distribution while remaining manufacturable using standard refractory construction methods.
3Productivity
If flow velocity is increased to improve steel charging rate, then productivity increases, but turbulence and short-circuiting worsen
Solution Approach 1:
The impact pad acts as an intermediary device between the incoming high-velocity steel stream and the tundish contents. It mediates the flow by redirecting the steel stream through controlled paths, creating a buffer zone that dissipates kinetic energy while maintaining forward motion, thus enabling high charging rates without excessive turbulence.
Solution Approach 2:
The design replaces purely mechanical flow redirection with a combination of geometric flow control and natural flow patterns. The inwardly extending feature creates flow channels that guide steel flow using pressure gradients and flow dynamics rather than purely mechanical redirection, reducing turbulence while maintaining productivity.
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 design enhances plug flow characteristics, reduces turbulence, and increases the uniformity of residence time, thereby improving the quality of molten steel flow and reducing short-circuiting, allowing for better segregation of impurities and uniform steel composition.
Implementation Method 1
Impact pads disclosed in the prior art have generally been designed with particular attention to the upwardly directed component of the resulting flow. The wall having a latitudinal portion, a longitudinal portion, and an inwardly extending feature... producing, in use, flow velocities of fluid across the top of the latitudinal wall that exhibit a minimum at a central portion of the latitudinal portion of the wall
Data Source
AI summary
A tundish impact pad formed from refractory material comprises a base having an impact surface which, in use, faces upwardly against a stream of molten metal entering a tundish, and a wall extending upwardly from the base around at least a part of the periphery of the impact surface. The wall has at least one latitudinal portion. An inwardly-extending feature protrudes from the latitudinal wall. The inwardly-extending feature inhibits flow exiting the impact pad from passing over the center of the latitudinal portion of the wall.