Metallurgical Furnace Cooling Under Tapholes Using Negative Pressure
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Solution Overview
Problem
Existing metallurgical furnaces face challenges in effectively and safely cooling critical components such as the portion below the taphole, taphole lintel, electrode seal, and chute ends, due to inefficiencies in air-cooling and water-spray systems, which can lead to hazardous explosions and equipment damage.
Innovation Solution
A fluid-cooling system using negative pressure to circulate a coolant through conduits welded to the furnace shell, with independent pumps, heat exchangers, and reservoirs, ensuring safe and efficient heat transfer without risking fluid ingress into the furnace chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If air cooling is used for the furnace structure, then the cooling system is simple, but the cooling efficiency is insufficient and hot spots occur
Solution Approach 1:
The patent replaces air cooling with water cooling systems. Water-cooled channels are integrated into the furnace structure, allowing liquid coolant to flow through and remove heat more efficiently than air, thereby eliminating hot spots while maintaining system simplicity
Solution Approach 2:
The patent changes the cooling medium from gas (air) to liquid (water), fundamentally altering the cooling parameter to achieve superior heat transfer efficiency and temperature uniformity across the furnace structure
2Temperature
If the furnace operates at high temperature, then the metallurgical process is efficient, but thermal stress causes cracks in the furnace structure
Solution Approach 1:
The patent implements preliminary cooling through water-cooled channels that are pre-positioned within the furnace structure. These channels actively remove heat before thermal stress can accumulate and cause cracking, allowing the furnace to operate at high temperatures while maintaining structural integrity
Solution Approach 2:
The water-cooling system acts as an intermediary between the high-temperature furnace interior and the external environment. It mediates the thermal load, preventing direct thermal stress from compromising the furnace structure while enabling efficient high-temperature operation
3Device complexity
If conventional cooling methods are used, then the system is simple, but metal dendrite formation occurs during solidification
Solution Approach 1:
The patent employs water-cooled channels to provide controlled, uniform cooling during the solidification process. This hydraulic cooling system prevents localized overheating and dendrite formation, ensuring high metal quality while maintaining reasonable system complexity
Solution Approach 2:
The patent changes the cooling approach from conventional methods to water-based thermal management, altering the temperature distribution parameters during solidification to prevent dendrite formation and improve metal quality
4Strength
If the furnace structure is thick to withstand heat, then thermal stress is reduced, but the furnace volume increases
Solution Approach 1:
The patent introduces water-cooled channels as an internal thermal management system. This allows the furnace structure to be thinner while still withstanding thermal stress, as the active cooling prevents excessive heat accumulation, thereby reducing the required furnace volume
Solution Approach 2:
The patent changes the thermal management parameter from passive thick-wall design to active water-cooling, allowing reduced wall thickness while maintaining thermal stress resistance and minimizing furnace volume
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 system effectively cools critical furnace parts, preventing coolant ingress and reducing the risk of explosions, while maintaining operational safety and efficiency.
Implementation Method 1
fluid-cooling system
Implementation Method 2
fluid-cooling system
Implementation Method 3
thermal stress
Data Source
Figure 1
Figure 2
AI summary
A metallurgical furnace 10 comprises a fluid-cooling system 40 for a first part 42 of the furnace below a taphole 16. The fluid-cooling system comprises a conduit 44 that is in heat exchanging relationship with the first part 42. The conduit 44 has an inlet 46 and an outlet 48. A suction pump 50 creates a negative pressure within the conduit 44. The pump has an inlet 52 that is in fluid flow communication with the outlet 48 of the conduit and an outlet 54 for discharging pressurised cooling fluid from the pump. A cooling fluid reservoir 56 has an inlet 58 and an outlet 60. The pump 50 draws the cooling fluid 47 from the cooling fluid reservoir 56 through the inlet 46 of the conduit 44 and out the outlet 48 of the conduit in order to transfer heat from the first part 42 of the furnace to the cooling fluid that flows through the conduit.