Electric Arc Furnace With Oscillating Chamber And Fixed Roof
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electric arc furnaces experience inefficiencies due to power off times, energy dispersion, and material loss during the melting cycle, particularly due to the need to open and close the roof for loading and tapping, which affects production capacity and environmental impact.
Innovation Solution
An electric arc furnace design featuring a fixed roof with oscillating molten steel chamber and continuous scrap feeding system, allowing for reduced power off times, minimized energy dispersion, and improved material handling through a rotoidal coupling of the roof and chamber, enabling continuous operation and reduced thermal unbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the roof is opened and closed for loading and tapping operations, then material can be loaded and steel can be tapped, but power off times increase and production capacity decreases
Solution Approach 1:
The furnace is divided into two independent functional parts: a fixed roof structure and an oscillating chamber. This segmentation allows the chamber to rotate independently for tapping while the roof remains closed and stationary for continuous electrode operation, eliminating the need to power off during tapping operations.
Solution Approach 2:
Instead of the conventional design where the roof oscillates with the chamber, this invention inverts the approach by keeping the roof fixed and making the chamber oscillate. This inversion allows the roof to remain closed during tapping operations, maintaining power supply continuity and reducing downtime.
2Quantity of substance
If the roof is cooled to handle large volumes of scrap, then scrap loading capacity increases, but energy is dispersed through cooling requirements
Solution Approach 1:
The cooling function is extracted from the roof structure and transferred to the oscillating chamber. The chamber walls are cooled instead of the roof, allowing the roof to remain thermally stable and structurally simple while still handling large volumes of scrap through the oscillating chamber's cooling capability.
3Ease of operation
If the chamber is rotated for tapping operations, then steel can be poured out, but the roof must move which complicates the exhaust system positioning
Solution Approach 1:
The exhaust system is segmented into a fixed component on the stationary roof and a movable component on the oscillating chamber. This allows the chamber to rotate freely for tapping while the roof-mounted exhaust intake remains in a fixed position, connected to the chamber exhaust through a flexible or rotatable joint.
4Productivity
If conventional furnaces use baskets for loading scrap, then loading is simplified, but power off times increase and production capacity is reduced
Solution Approach 1:
The furnace enables continuous operation by keeping the roof closed and electrodes powered throughout the entire cycle. Scrap is loaded through the closed roof, melting occurs continuously, and tapping is performed by oscillating the chamber rather than opening the roof, maintaining uninterrupted power supply and continuous production.
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 design enhances production efficiency by minimizing power off times, reducing energy loss, and stabilizing the melting process, while maintaining a compact and efficient steel production system with reduced environmental impact and improved scrap handling.
Implementation Method 1
an electric arc furnace (EAF) where the scrap is melted
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
This invention concerns an electric arc furnace (4) comprising a chamber (8) suitable for containing molten steel; a roof (12) suitable for covering the chamber (8) and for containing a mass of scrap steel; electrodes (16) suitable for melting the mass of scrap, and means of support (20) on a base (24). The latter means (20) are such as to support the chamber (8) and permit its oscillation around a horizontal axis of rotation (X-X). 'The roof (12) and the chamber (8) are counterprofiled in correspondence to the respective interface walls (30) to create a rotoidal type coupling with regard to the axis of rotation (X-X). The roof (12), during oscillation of the chamber (8), remains fixed with regard to the base (24) as well as in a closed position with regard to the chamber (8).