Inert Gas Sealing Device for Electric-Arc Furnace Electrodes
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Solution Overview
Problem
Existing sealing devices in electric-arc furnaces that use water as a pressurizing medium risk causing water-gas explosions when water enters the high-temperature furnace atmosphere, posing a safety hazard.
Innovation Solution
A sealing device utilizing an inert gas, such as nitrogen, to pressurize a graphite rope sealing and a graphite sealing ring, eliminating the need for water and preventing water-gas explosions, with a metallic double casing structure for air cooling and a refractory lining to manage gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water is used as the pressurizing medium in the sealing device, then the sealing effectiveness is improved, but the risk of water-gas explosion increases when water enters the high-temperature furnace atmosphere
Solution Approach 1:
The patent replaces water with an inert gas (such as nitrogen or argon) as the pressurizing medium in the sealing device. This inert gas is introduced into the sealing chamber to pressurize the sealing element against the electrode, maintaining effective sealing while eliminating the risk of water-gas explosion that would occur if water contacted the high-temperature furnace atmosphere.
2Object-affected harmful factors
If an inert gas is used as the pressurizing medium instead of water, then the safety risk of water-gas explosion is eliminated, but the sealing effectiveness may be reduced
Solution Approach 1:
The patent adjusts key parameters of the inert gas system to achieve sealing effectiveness comparable to water-based systems. This includes optimizing the pressure of the inert gas, selecting appropriate sealing element materials (such as graphite or PTFE) that work effectively with gas pressurization, and designing the sealing chamber geometry to ensure uniform pressure distribution. These parameter changes maintain reliable sealing while using the safer inert gas medium.
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 solution effectively prevents water-gas explosions by using an inert gas as the pressurizing medium, ensuring safe operation and maintaining a gas-tight seal around the electrode, while avoiding the risks associated with water usage.
Implementation Method 1
a hose that is arranged around the graphite rope sealing, in between the frame and the graphite rope sealing, and can be pressurized by pressurizing medium in order to expand the hose for pressing the graphite rope sealing against the rod electrode structure
Implementation Method 2
the frame comprises a metallic double casing structure including an inner casing and an outer casing, which is spaced apart from the inner casing, so that in between the casings, there is formed an annular space for the cooling agent
Data Source
AI summary
In a sealing device (1) for sealing the through hole of an electrode, the pressurizing medium that generates the pressure of mechanical sealings against a rod electrode structure is an inert gas, such as nitrogen. The means for pressing the created sealing ring (6) against the rod electrode structure (4) include a gas distribution chamber (8) surrounding the sealing ring (6); a first channel (9) that is arranged to provide a flow path for the inert gas in between the hose (14) and the gas distribution chamber (8); an annular groove (10) in the sealing surface (7) of the sealing ring (6); and a second channel (11), which is placed in the sealing ring (6) and is arranged to provide a flow path for the gas from the gas distribution chamber to the groove (10) for extruding the gas in between the sealing surface (7) and the rod electrode structure (4).