Friction Ignition Disc for Metallurgical Burner
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Solution Overview
Problem
Conventional spark-based ignition systems for burners in metallurgical treatment rooms face challenges due to precise positioning requirements, exposure to high temperature differences, and slag spatter, leading to reliability and maintenance issues, especially in fuel-oxygen burners with slim designs that affect gas flow.
Innovation Solution
A friction ignition system using a rotatably mounted ignition disc made of cerium iron interacting with a sparking material like flint, generating heated solid particles that are ejected towards the burner mouth to ignite the fuel-oxidant mixture, eliminating the need for precise electrode positioning and reducing maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spark-based ignition device is positioned close to the burner mouth for effective ignition, then ignition reliability is improved, but the device becomes exposed to slag splashes and high temperature differences, worsening its durability and maintenance requirements
Solution Approach 1:
The patent introduces a water-cooled protective cage as an intermediary structure between the ignition device and the harsh environment. The cage serves as a physical barrier that protects the ignition electrodes from slag splashes while allowing the ignition function to operate effectively. The water cooling system acts as a thermal mediator, dissipating heat from the protective cage to prevent thermal damage.
Solution Approach 2:
The patent replaces the conventional spark-based ignition system with a hot wire ignition system. The hot wire ignition device generates ignition through resistive heating rather than electrical sparks, which eliminates the need for precise electrode positioning and reduces sensitivity to environmental factors. This substitution improves reliability while allowing the device to be positioned in a protected location.
2Reliability
If a spark-based ignition device uses precise electrode positioning for effective sparking, then ignition performance is improved, but the device complexity and maintenance requirements increase
Solution Approach 1:
The patent replaces the mechanical spark generation system with a thermal ignition system using a resistive heating wire. This substitution eliminates the need for precise electrode positioning, gap maintenance, and complex electrical insulation requirements. The hot wire ignition device achieves reliable ignition through controlled resistive heating, significantly simplifying the mechanical and electrical design.
Solution Approach 2:
The patent changes the ignition mechanism from electrical discharge (sparks) to thermal heating (hot wire). This parameter change in the ignition method fundamentally alters the system requirements, eliminating the need for precise geometric positioning of electrodes and reducing sensitivity to environmental variations. The ignition performance is controlled through electrical power parameters rather than mechanical positioning.
3Volume of moving object
If the burner is designed with a slim profile for fuel-oxygen combustion, then space efficiency is improved, but the ignition device positioning becomes more difficult and gas flow is more affected
Solution Approach 1:
The patent replaces the spatially-critical spark electrode system with a compact hot wire ignition element that can be integrated into the slim burner structure. The hot wire ignition device requires minimal space and can be positioned within the compact fuel-oxygen burner without affecting gas flow patterns. This substitution enables reliable ignition in space-constrained applications.
Solution Approach 2:
The hot wire ignition system serves multiple functions within the compact burner: it provides reliable ignition, can be positioned flexibly within the slim structure, and does not interfere with the gas flow dynamics. The universal applicability of the hot wire ignition approach allows it to function effectively in various burner configurations including the space-constrained fuel-oxygen burner design.
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 friction ignition system provides reliable ignition with reduced maintenance, as the ignition device can be positioned deeper within the burner channels, protected from slag spatter, and operates efficiently with various fuels and oxidizers, including oxygen, ensuring consistent ignition without the limitations of traditional spark igniters.
Implementation Method 1
A friction ignition system using a rotatably mounted ignition disc made of cerium iron interacting with a sparking material like flint, generating heated solid particles
Data Source
Figure 1~2
AI summary
Metallurgical burners, particularly oxygen burners without mixing chambers or flame holders, are typically equipped with a spark-based ignition device. Such ignition devices must be located near the burner mouth. Due to the high stresses in this area and contamination occurring during operation from slag splashes and the like emerging from the melt, the ignition device requires frequent replacement, cleaning, and/or readjustment. To reduce the maintenance required for the ignition device, the invention proposes equipping a burner with a friction ignition system. In this system, highly heated particles are generated by the friction of a rotatably mounted ignition disc against an ignition element. These particles are then propelled towards the fuel-oxidizing agent mixture forming at the burner mouth.