Vortex Scrap Submergence with VOC Hood for Aluminum Oxidation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Melting light gauge aluminum scrap is challenging due to rapid oxidation and the difficulty in submerging thin-walled scrap pieces into molten metal, which leads to inefficient processing and undesirable dross foam formation.
Innovation Solution
A vortex control diverter system is introduced, allowing adjustable vortex speed and depth control within the molten metal bath, combined with a VOC elimination hood to manage processing fluids and reduce oxidation, enabling slower submergence of scrap pieces and increased evaporation of volatile compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If light gauge aluminum scrap is exposed to air at high temperatures to melt it, then the melting process can proceed, but rapid oxidation occurs which consumes the aluminum and reduces its value
Solution Approach 1:
The patent creates a protective atmosphere above the molten metal by evaporating volatile compounds from processing fluids and controlling the gas composition in the charge well. This inert-like environment prevents oxygen from reaching the aluminum surface, thereby preventing oxidation while allowing high-temperature melting to proceed.
Solution Approach 2:
The patent converts the harmful effect of volatile compound evaporation into a beneficial protective atmosphere. The evaporation process, which initially seemed harmful due to dross foam formation, is controlled to create a protective gas layer that prevents oxidation of the aluminum scrap during melting.
2Object-affected harmful factors
If thin-walled scrap pieces are quickly submerged in molten metal to prevent oxidation, then oxidation is reduced, but the floating scrap cannot be effectively submerged due to buoyancy
Solution Approach 1:
The patent uses fluid dynamics and gas pressure to submerge the floating scrap. By controlling the evaporation of volatile compounds and managing gas flow in the charge well, a downward force is created that pushes the buoyant scrap pieces below the molten metal surface, overcoming their floating tendency.
Solution Approach 2:
The patent changes the physical parameters of the charge well environment by controlling temperature, pressure, and gas composition. These parameter changes create conditions where the protective atmosphere forms and gas pressure sufficient to submerge floating scrap pieces is generated.
3Object-generated harmful factors
If volatile compounds are evaporated from processing fluids to eliminate dross foam, then dross foam formation is reduced, but oxidation of aluminum increases due to exposure to air
Solution Approach 1:
The patent converts the harmful effect of volatile compound evaporation into a beneficial protective atmosphere. The evaporation process, which initially seemed harmful due to dross foam formation, is controlled to create a protective gas layer that prevents oxidation of the aluminum scrap during melting.
Solution Approach 2:
The patent creates a protective atmosphere above the molten metal by evaporating volatile compounds from processing fluids and controlling the gas composition in the charge well. This inert-like environment prevents oxygen from reaching the aluminum surface, thereby preventing oxidation while allowing high-temperature melting to proceed.
4Productivity
If a vortex is created to submerge scrap in molten metal, then submergence efficiency improves, but control over vortex speed and depth is difficult
Solution Approach 1:
The patent incorporates feedback control mechanisms to monitor and adjust vortex parameters. By sensing the actual vortex speed and depth and comparing them to target values, the system automatically adjusts operating parameters to maintain optimal submergence conditions.
Solution Approach 2:
The patent makes the vortex control system dynamic and adjustable rather than fixed. The vortex speed and depth can be varied in real-time based on scrap load, metal level, and other process conditions, allowing optimal performance across different operating scenarios.
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 approach enhances the efficiency of scrap submergence, reduces dross foam formation, and minimizes metal oxidation by optimizing the submergence process and volatile compound management, thereby improving the overall recycling process.
Implementation Method 1
A vortex control diverter system is introduced, allowing adjustable vortex speed and depth control within the molten metal bath
Implementation Method 2
combined with a VOC elimination hood to manage processing fluids and reduce oxidation, enabling slower submergence of scrap pieces and increased evaporation of volatile compounds
Implementation Method 3
molten metal contained in a hearth is circulated by a pump contained in a pump well
Data Source
AI summary
A molten metal scrap submergence system comprising a furnace and a vortexing scrap submergence well. The vortexing scrap submergence well includes a diverter suspended above the well and oriented for immersion in a bath of molten metal circulating within the well. The system, or an alternative scrap submergence system, can include a hood element disposed in an overlapping position with regard to a top opening of the scrap submergence well. The hood at least substantially seals the top opening. The hood element includes a scrap piece feed chute and a burner allowing carbon containing vapor evaporated from the surface of the molten scrap pieces to combust and form predominantly water. The system, or an alternative scrap submergence system can include internal side walls of the well with a first diameter portion adjacent and above said ramp and a second, larger diameter portion above said first portion.