Silica Soot Burner Layout for Low-Noise Preform Deposition
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Solution Overview
Problem
Conventional outside vapor deposition systems for producing silica soot in optical fiber preforms suffer from inefficient soot capture, leading to waste and noise pollution due to dispersed soot, and high combustion noise levels.
Innovation Solution
A burner design that premixes or surface mixes fuel and oxidizer streams to create distinct flames, with a shield gas and secondary oxidizer stream to control combustion, minimizing soot dispersion and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional outside vapor deposition systems combust silicon-containing fuels to form silica soot, then soot is produced for optical fiber preform deposition, but the soot becomes dispersed leading to lower capture efficiency and waste
Solution Approach 1:
The patent changes combustion parameters including equivalence ratio (maintaining between 0.8-1.2), flame temperature control, and pressure conditions to optimize soot particle formation and reduce dispersion. By precisely controlling these parameters, the system achieves better soot capture efficiency while minimizing waste
Solution Approach 2:
The patent introduces a carrier gas stream as an intermediary that transports the combustion products containing silica soot particles to the deposition zone. This carrier gas acts as a mediator between the combustion chamber and the substrate, improving soot delivery efficiency and reducing un captured soot waste
2Quantity of substance
If silicon-containing fuels are combusted in large-scale soot generation operations, then sufficient soot is produced for optical fiber manufacturing, but audible noise increases
Solution Approach 1:
The patent modifies combustion parameters including operating pressure, equivalence ratio, and flame velocity to reduce noise generation while maintaining soot production volume. By optimizing these parameters, the system achieves quiet combustion suitable for large-scale operations
Solution Approach 2:
The patent replaces conventional high-velocity combustion mechanisms with a controlled, lower-velocity combustion process that uses carrier gas flow rather than high-speed flame propagation. This substitution reduces mechanical noise while maintaining effective soot generation and transport
3Productivity
If dispersed silica soot is not captured on the bait rod or core cane, then the deposition process continues, but the soot is exhausted as waste or deposited undesirably on chamber surfaces
Solution Approach 1:
The carrier gas stream serves as an intermediary that directs soot particles precisely to the deposition substrate, reducing stray soot that would otherwise deposit on chamber surfaces. This improves deposition efficiency and reduces cleaning requirements
Solution Approach 2:
The system monitors deposition rates and combustion conditions to optimize carrier gas flow and combustion parameters in real-time. This feedback control ensures maximum soot capture efficiency and minimizes waste deposition on chamber surfaces
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
Enhances soot capture efficiency and reduces audible noise by optimizing combustion processes, improving the deposition process and reducing waste.
Implementation Method 1
combusting a silicon-containing fuel to produce a stream of silica soot particles
Implementation Method 2
combusting one or more silicon-containing fuels to form silica soot
Implementation Method 3
Outside vapor deposition involves the process of combusting one or more silicon-containing fuels to form silica soot. The silica soot is then deposited on a bait rod or core cane to form the optical fiber preform
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A method of producing soot, including: combusting a first fuel stream and a first oxidizer at a burner face; combusting a second fuel stream and a second oxidizer at the burner face, wherein the second fuel stream and the second oxidizer are premixed in advance of the burner face and a second equivalence ratio of the second fuel stream and the second oxidizer is less than about 1; and combusting a silicon-containing fuel into a plurality of soot particles 12, wherein the second fuel stream and the second oxidizer are combusted between the first fuel stream and the silicon-containing fuel. Combustion of the silicon-containing fuel occurs at the lift-off distance 18 away from the burner face, advantageously at a distance between 0.1 cm and 0.8 cm. Applying this method of producing soot to deposit a preform suitable for the manufacture of optical fibers.