Indirect Cooling Tapping Channel for Metallurgical Furnace
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Solution Overview
Problem
The existing tapping channels in metallurgical furnaces, especially electric arc reduction furnaces, face issues with erosion of tap hole bricks, leading to compromised thermal conductivity and tightness, necessitating frequent repairs and resulting in production interruptions, as the cooling medium can enter the furnace when damage occurs, causing safety concerns and inefficiencies.
Innovation Solution
A tapping channel design featuring a copper jacket that surrounds the tap hole bricks externally, providing indirect cooling and preventing the cooling medium from entering the furnace, while allowing for easy maintenance and using standard brick formats, with the tap hole brick facing the interior not covered by the jacket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the tapping channel is directly cooled with cooling medium carried into the interior of the furnace, then cooling efficiency is improved, but the risk of cooling medium entering the furnace and compromising safety increases
Solution Approach 1:
The patent introduces a copper jacket as an intermediary structure between the cooling medium and the furnace interior. The jacket contains cooling channels that allow cooling medium circulation without direct contact with the furnace interior, thus maintaining cooling efficiency while preventing contamination of the molten charge.
Solution Approach 2:
The tapping channel is segmented into an outer copper jacket containing cooling channels and an inner tap hole brick structure. This segmentation allows the cooling function to be separated from the functional tapping area, enabling independent optimization of cooling performance and safety.
2Productivity
If the tap hole bricks are replaced while high temperatures are present to minimize production interruptions, then productivity is improved, but the complexity of maintenance operations increases
Solution Approach 1:
The tapping channel is divided into replaceable components: the copper jacket remains in place while only the tap hole bricks are removed and replaced. This segmentation allows maintenance to be performed on specific components without shutting down the entire furnace, maintaining productivity while simplifying the maintenance process.
Solution Approach 2:
The copper jacket is pre-installed with cooling channels and positioning features before the tap hole bricks are placed. This preliminary preparation allows for quick replacement of bricks without complex alignment procedures, reducing maintenance time and complexity.
3Temperature
If the cooling device surrounds the tap hole bricks completely, then cooling effectiveness is improved, but the erosion protection and lining integrity are compromised
Solution Approach 1:
The copper jacket provides cooling coverage to the portions of tap hole bricks that are most susceptible to thermal stress and erosion, while leaving the inner surface facing the furnace interior uncovered. This local approach maintains lining integrity and prevents cooling medium ingress while providing adequate cooling where needed.
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 enhances the stability and service life of the tapping channel, minimizes erosion, ensures the lining integrity, facilitates faster and safer access, and reduces furnace shutdown times by maintaining the preconfigured form and allowing for efficient cooling without internal cooling medium ingress.
Implementation Method 1
The tapping channel is indirectly cooled due to the high thermal conductivity of the copper jacket
Data Source
AI summary
The invention relates to a tapping channel (1) for a metallurgical furnace, particularly for an electro-reducing furnace, comprised of at least one tapping brick (10, 11, 12) and of a cooling device in the vicinity of the tapping channel (1). The cooling device is provided in the form of a sleeve (14), which indirectly cools a tapping brick (2) and which at least partially surrounds the furnace wall (3) in the vicinity thereof.