Refractory Distribution Device Thermal Insulation
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Solution Overview
Problem
In direct chill casting systems, refractory distribution devices face challenges in achieving an ideal balance between mechanical and thermal properties, leading to thermal fatigue and temperature gradients that affect the quality and consistency of metal billets, as materials with low thermal conductivity are often mechanically weak, while strong materials have high thermal conductivity.
Innovation Solution
A distribution device with a refractory body and a thermally insulating layer beneath the base, where the refractory material has a specific thermal conductivity and the insulating layer has a significantly lower thermal conductivity, reducing heat conduction and heat loss, allowing for the use of materials with higher thermal conductivity but improved mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If refractory material with low thermal conductivity is used, then heat loss is reduced, but mechanical strength is insufficient
Solution Approach 1:
The distribution device uses a composite structure combining refractory material (for thermal insulation) with a support structure (for mechanical strength). The refractory material is positioned to contact the liquid metal, while the support structure provides structural integrity, allowing the system to achieve both low heat loss and high mechanical strength simultaneously.
Solution Approach 2:
Different parts of the distribution device have different material properties optimized for their specific functions. The region in contact with liquid metal uses refractory material with low thermal conductivity to minimize heat loss, while other structural regions use materials with higher mechanical strength. This local differentiation resolves the contradiction between thermal insulation and structural strength.
2Strength
If refractory material with high mechanical strength is used, then structural integrity is improved, but thermal conductivity is too high causing thermal fatigue
Solution Approach 1:
The composite structure separates the functions of mechanical support and thermal insulation. The support structure provides the necessary mechanical strength to withstand operational loads, while the refractory material layer minimizes heat conduction to the support table. This functional separation resolves the contradiction between strength and thermal insulation.
Solution Approach 2:
The distribution device applies different material properties to different regions: refractory material with low thermal conductivity is applied to surfaces in contact with hot liquid metal to prevent heat loss, while structural components require only sufficient strength. This localized application of material properties resolves the contradiction between mechanical strength and thermal insulation.
3Strength
If high thermal conductivity material is used, then structural strength is achieved, but temperature gradients in liquid metal increase
Solution Approach 1:
The composite structure with refractory material lining creates a thermal barrier between the liquid metal and the support structure. This prevents heat extraction from the liquid metal through the distribution device walls, maintaining temperature uniformity while the outer support structure provides the necessary mechanical strength.
Solution Approach 2:
The refractory material is strategically positioned in regions where thermal insulation is most critical - at the inner surfaces contacting the liquid metal. This local thermal insulation prevents temperature gradients from developing in the liquid metal, while structural strength is provided by the overall device geometry and support framework.
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 configuration reduces thermal fatigue in the support table, minimizes temperature gradients in the liquid metal, and enhances the quality and consistency of the metal billets produced, while also allowing for a lighter or stronger distribution device with extended service life.
Implementation Method 1
a thermally insulating layer located beneath the base, wherein the refractory material of the body has a first thermal conductivity and the thermally insulating layer is made of an insulating material having a second thermal conductivity that is less than the first thermal conductivity
Implementation Method 2
heat transferred by conduction from the liquid metal through the refractory distribution device to the steel casting table
Data Source
AI summary
A distribution device for use with a vertical casting system includes a body made of a refractory material, which includes a base and a peripheral wall. The base and the peripheral wall enclose a trough for containing and distributing liquid metal. A thermally insulating layer is located in a recess beneath the base. The refractory material of the body has a first thermal conductivity and the thermally insulating layer is made of a material having a second thermal conductivity that is less than the first thermal conductivity.