Furnace Lining Containment Ring Seals Brick-Cooler Gaps
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Solution Overview
Problem
Existing metallurgical furnace lining and cooling arrangements face issues with gap formation due to differential thermal expansion, leading to leakage of molten material between the refractory brick lining and cooling elements, despite the use of hold down mechanisms like springs or hydraulics.
Innovation Solution
A containment ring is introduced, extending below and above the interface between the refractory bricks and cooling elements, made from materials like copper, stainless steel, or cast iron, with a bolting arrangement to ensure contact and an optional expansion layer for accommodating thermal expansion, forming a continuous ring with lap joints to seal potential leakage paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hold down mechanisms with springs or hydraulics are used to press coolers onto brick lining, then contact between coolers and bricks is improved, but gaps still form due to differential thermal expansion
Solution Approach 1:
The cooler design incorporates a toe extension that locally increases contact area with the brick lining at the critical hot face region. This localized geometric modification ensures reliable contact where thermal expansion differential is most problematic, without requiring complex hold-down mechanisms across the entire cooler structure.
Solution Approach 2:
The cooler assembly is designed to dynamically adjust its position and contact pressure in response to thermal expansion and contraction cycles. The combination of toe extension and hold-down mechanism allows the system to maintain contact during both expansion (when cooler lifts) and contraction (when cooler settles) phases of thermal cycling.
2Stability of the object's composition
If coolers are constrained vertically on the furnace shell, then structural stability is improved, but gap formation occurs on the hot face due to restricted thermal expansion
Solution Approach 1:
The cooler structure is segmented into distinct functional zones: a constrained portion attached to the furnace shell for structural stability, and a free toe extension that can make contact with the brick lining. This segmentation allows different parts of the same component to have different degrees of freedom, simultaneously achieving structural stability and proper contact.
Solution Approach 2:
The toe extension acts as an intermediary element between the constrained cooler body and the brick lining. It transfers and distributes the contact force over a larger area, improving the effective contact area while the main cooler body remains vertically constrained for structural stability.
3Ease of operation
If individual hold down mechanisms are used for each cooler, then independent adjustment is improved, but leakage occurs at vertical interfaces between adjacent coolers
Solution Approach 1:
Adjacent coolers are connected through shared containment rings that form continuous seals around the perimeter of multiple cooler units. This merging of sealing functions eliminates the vertical interface gaps between independently held-down coolers, preventing slag leakage while maintaining individual cooler adjustability through their respective hold-down mechanisms.
Solution Approach 2:
The sealing approach transitions from two-dimensional contact (horizontal interface only) to three-dimensional containment by adding vertical sealing through containment rings. This dimensional extension creates a continuous seal that wraps around the cooler assembly, blocking leakage paths at vertical interfaces while preserving independent horizontal adjustment capability.
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 containment ring effectively seals gaps between the refractory bricks and cooling elements, reducing leakage by maintaining contact and accommodating thermal expansion, thereby enhancing the durability and performance of the furnace lining.
Implementation Method 1
the brick lining expands upwards due to thermal expansion of the sidewall brick lining itself as well as radial thermal expansion of the furnace hearth brick lining
Implementation Method 2
the refractory brick lining underneath the coolers expands more on the hot face compared to the cold face
Data Source
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AI summary
This invention relates to a lining and cooling arrangement for a metallurgical furnace. The arrangement includes a layer of refractory bricks located adjacent a furnace shell of the furnace, the layer of refractory bricks having a hot side that faces the inside of the furnace, and a cold side that faces the furnace shell. The arrangement also includes a cooling element located on top of the layer of refractory bricks, the cooling element having a hot side that faces the inside of the furnace, and a cold side that faces the furnace shell. A contact interface is defined between the top of the layer of refractory bricks and a bottom of the cooling element, and a containment ring, covering the contact interface, is located adjacent the cold sides of the cooling element and the layer of refractory bricks.