Glass Delivery Conduit Electrode Placement for Uniform Current Density
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Solution Overview
Problem
In glass manufacturing, the uneven current density distribution within metal delivery tubes can lead to non-homogeneous glass quality and reduced longevity of the tubes due to high current density at certain parts.
Innovation Solution
A delivery apparatus comprising a linear conduit, an elbow conduit, and an electrical circuit with strategically positioned electrodes to heat the conduits, ensuring current density does not exceed 8 amps/mm², and a stirring element to maintain glass homogeneity, with the elbow conduit's curvature and electrode placement designed to distribute heat evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a current is applied to heat the metal delivery tube, then the glass can be heated and maintained at required temperature, but the current density becomes disproportionately high at certain parts leading to non-homogeneous glass quality and reduced tube longevity
Solution Approach 1:
The delivery tube is divided into multiple segments (first delivery tube portion, second delivery tube portion, third delivery tube portion) with different wall thicknesses. This segmentation allows each portion to have optimized current density characteristics, preventing disproportionate heating at specific locations while maintaining overall glass temperature control.
Solution Approach 2:
Different portions of the delivery tube are given different wall thicknesses to create local quality variations. The first portion has greater wall thickness to reduce current density, the second portion has intermediate thickness, and the third portion has least thickness. This local differentiation ensures uniform current density distribution and homogeneous glass quality throughout the delivery path.
2Temperature
If a current is applied to heat the metal delivery tube, then the glass can be heated and maintained at required temperature, but the longevity of the delivery tube suffers due to high current density at certain parts
Solution Approach 1:
The delivery tube is segmented into multiple portions with varying wall thicknesses, distributing the current load across different sections. This prevents any single section from experiencing excessive current density that would accelerate degradation, thereby extending the overall service life of the delivery tube.
Solution Approach 2:
The wall thickness parameter is varied along the length of the delivery tube to optimize current density distribution. By changing this geometric parameter, the electrical resistance is adjusted in different sections, preventing hot spots and reducing thermal stress that would otherwise shorten the tube's operational life.
3Temperature
If a current is applied to heat the metal delivery tube, then the glass can be heated, but the current density distribution becomes uneven throughout the delivery tube
Solution Approach 1:
The delivery tube is divided into multiple segments with different wall thicknesses, creating distinct electrical resistance zones. This segmentation ensures that current density is distributed more evenly across the tube length, preventing concentration at specific locations and achieving stable, uniform current density distribution.
Solution Approach 2:
Each portion of the delivery tube is designed with specific local quality characteristics (different wall thicknesses) to control current density at that location. The first portion has greater thickness for lower current density, the second has intermediate thickness, and the third has least thickness, creating a balanced overall distribution.
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 achieves a uniform current density distribution, preventing overheating and maintaining glass quality, while extending the lifespan of the delivery tubes by controlling current flux through the conduits independently.
Implementation Method 1
heating the molten glass inside the delivery apparatus by applying an electrical current to the linear conduit and the elbow conduit
Data Source
AI summary
Delivery apparatus include an electrical circuit configured to heat a linear conduit and an elbow conduit. A first electrode can be mounted to an upstream portion of the linear conduit, a second electrode can be mounted downstream of the upstream portion, and a third electrode can be mounted to a curved segment of the elbow conduit within a footprint extension of a first passage of the linear conduit. In further examples, a delivery apparatus includes an electrical circuit with a first electrode mounted to an upstream portion of a linear conduit, a second electrode mounted to a downstream portion of the linear conduit, and a third electrode mounted to an elbow conduit. In still further examples, methods of heating molten glass include application of an electrical current such that neither a current flux through a linear conduit nor a current flux through an elbow conduit exceeds 8 amps/mm2.