Elastically Interconnected Cooler Compressed Hearth
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Solution Overview
Problem
Conventional smelting furnaces face challenges in maintaining the compression of refractory bricks due to thermal expansion and contraction, leading to gaps that allow molten materials to leak, and existing containment shells are either expensive or limited in accommodating hearth expansion.
Innovation Solution
Elastically interconnected coolers arranged in ring segments and tiers provide inward compressive forces to maintain the brick hearth and lower walls in compression, eliminating the need for a containment shell and allowing for adjustable pressure to accommodate expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rigid hearth containment shells are used, then manufacturing cost is reduced, but the system cannot accommodate hearth brick expansion beyond very limited growth before shutdown and replacement is required
Solution Approach 1:
The containment shell transitions from a rigid static structure to a dynamic structure with movable segments and spring mechanisms that can adapt to hearth expansion. The segmented design with movable joints allows the shell to flex and accommodate the changing dimensions of the hearth bricks during their operational life.
Solution Approach 2:
The containment shell is divided into multiple segments that can move independently relative to each other. This segmentation allows each section to accommodate local expansion of hearth bricks while maintaining overall structural integrity, enabling the system to handle significant brick growth without complete replacement.
2Adaptability or versatility
If conventional containment systems are designed to accommodate thermal expansion of bricks, then brick growth is allowed, but pressure is not maintained when bricks cool down and shrink, allowing gaps to form that invite molten materials to penetrate
Solution Approach 1:
The spring mechanisms continuously adjust to maintain compression pressure on the hearth bricks through thermal cycles. As bricks expand and contract with temperature changes, the springs periodically engage and disengage to maintain constant inward pressure, ensuring gaps are closed during both expansion and contraction phases.
Solution Approach 2:
The containment system applies preliminary compressive force through springs before thermal expansion occurs. This pre-applied pressure counteracts the outward expansion force of the bricks, and the system is designed to maintain this pressure balance throughout the thermal cycle, preventing gap formation that would allow molten material penetration.
3Reliability
If flexible shells with springs and tie rods are used to keep refractory bricks tightly pressed together, then brick compression is maintained during expansion, but the cost becomes prohibitive
Solution Approach 1:
The flexible containment system is segmented into modular sections with standardized spring mechanisms. This segmentation allows for simplified manufacturing and assembly compared to monolithic flexible shells, reducing overall cost while maintaining the compression function.
Solution Approach 2:
The design uses simpler, more cost-effective spring and segment components that can be manufactured economically. Rather than using expensive complex flexible shell mechanisms, the patent employs straightforward mechanical elements that achieve the same compression function at lower cost.
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 extends the service life of refractory bricks by preventing leaks and reducing maintenance costs, while maintaining hearth stability and preventing molten material penetration, even with significant hearth expansion.
Implementation Method 1
elastically interconnected cooler compressed hearth
Implementation Method 2
Each spring can be individually adjusted to obtain optimal working pressures on the whole of the hearth bricks
Implementation Method 3
conventional systems are normally designed to accommodate the thermal expansion of the bricks
Data Source
AI summary
An elastically interconnected cooler compressed hearth comprises a concave dished bottom lined with a sub-layer and a working layer of hearth bricks. Cylindrical walls that rise up from the rim of the concave dished bottom are constructed with one or more tiers of coolers shaped into arc segment blocks that are joined together by their flanges to form complete rings. The outer perimeter of the hearth brick within the ringed tiers is inwardly compressed toward the center to disallow any leaks from forming between the separate bricks. The coolers are elastically interconnected at their flanges by fasteners and springs. Each spring can be individually adjusted to obtain optimal working pressures on the whole of the core wall and hearth floor bricks.