Methods for heating a metallic vessel in a glass making process

Patent metadata

Field	Value
Publication number	US-12043565-B2
Application number	US-201917263671-A
Country	US
Kind code	B2
Filing date	Jul 11, 2019
Priority date	Jul 27, 2018
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

Methods for making a glass article are described that include flowing molten glass through a metallic vessel, and supplying alternating electrical currents to multiple electrical circuits, each electrical circuit including a power supply, a pair of adjacent electrical flanges connected to the power supply, and a portion of the metallic vessel extending between and in electrical communication with the pair of adjacent flanges. At least two adjacent electrical circuits of the multiple electrical circuits share an electrical flange that is a common electrical path for the two adjacent electrical circuits, the two adjacent electrical circuits being supplied with alternating electrical currents, wherein at least one of the electrical currents is cut by a phase-fired controller.

First claim

What is claimed is:

1. A method of heating a metallic vessel, comprising:
flowing molten glass through the metallic vessel, the metallic vessel comprising a plurality of electrical flanges attached to the metallic vessel, the plurality of electrical flanges comprising at least a first electrical flange, a second electrical flange spaced apart from the first electrical flange, and a third electrical flange spaced apart from the second electrical flange, the first electrical flange, the second electrical flange, and the third electrical flange arranged sequentially along a length of the metallic vessel, wherein the first electrical flange, the second electrical flange, and a first portion of the metallic vessel therebetween comprise a first electrical circuit, wherein the second electrical flange, the third electrical flange and a second portion of the metallic vessel between the second electrical flange and the third electrical flange comprise a second electrical circuit, and wherein the second electrical flange forms a common electrical path for the first electrical circuit and the second electrical circuit;
establishing a first alternating electrical current in the first electrical circuit and establishing a second alternating electrical current in the second electrical circuit with a first phase angle relative to the first alternating electrical current;
controlling an electrical power dissipated in at least one of the first portion of the metallic vessel or the second portion of the metallic vessel by cutting at least one of the first alternating electrical current or the second alternating electrical current during each one-half cycle of the respective at least one first alternating electrical current or second alternating electrical current; and
wherein a temperature of the second electrical flange is less than a temperature of the first portion and the second portion.

2. The method according to claim 1 , wherein an absolute value of the first phase angle is one of 0 degrees, 30 degrees, 60 degrees, or 120 degrees.

3. The method according to claim 1 , wherein the metallic vessel comprises a fourth electrical flange spaced apart from and sequential to the first, second, and third electrical flanges, the third electrical flange, the fourth electrical flange, and a third portion of the metallic vessel extending between the third electrical flange and the fourth electrical flange comprising a third electrical circuit, such that the third electrical flange provides a common electrical path for the second electrical circuit and the third electrical circuit, the method further comprising establishing a third alternating electrical current in the third electrical circuit with a second phase angle relative to the first alternating electrical current and a third phase angle relative to the second alternating electrical current.

4. The method according to claim 3 , wherein an absolute value of the second phase angle is one of 0 degrees, 30 degrees, 60 degrees, or 120 degrees.

5. The method according to claim 4 , wherein the absolute value of the second phase angle is equal to an absolute value of the first phase angle.

6. The method according to claim 3 , wherein an absolute value of the third phase angle is one of 0 degrees, 30 degrees, 60 degrees, or 120 degrees.

7. The method according to claim 6 , wherein the absolute value of the third phase angle is equal to an absolute value of the first phase angle.

8. The method according to claim 3 , wherein the first and second phase angles are non-zero, and a sign of the first phase angle is different than a sign of the second phase angle.

9. The method according to claim 1 , wherein the first alternating electrical current and the second alternating electrical current are provided by a first transformer and a second transformer, respectively.

10. The method according to claim 3 , wherein the third alternating electrical current is provided by a third transformer.

11. The method according to claim 1 , wherein the cutting comprises blocking the at least one of the first alternating electrical current and the second alternating electrical current during each one-half cycle of the respective at least one first alternating electrical current or second alternating electrical current with a phase-fired controller.

12. The method according to claim 1 , wherein the metallic vessel comprises a fining chamber.

13. The method according to claim 1 , further comprising supplying a forming body with the molten glass and drawing the molten glass from the forming body.

14. The method according to claim 13 , further comprising drawing the molten glass into a ribbon of glass.

15. A method of heating a metallic vessel, comprising:
flowing molten glass through the metallic vessel, the metallic vessel comprising n electrical flanges attached to the metallic vessel along a length thereof, the n electrical flanges forming n−1 electrical circuits, each of the n−1 electrical circuits including two adjacent flanges of the n electrical flanges and a respective portion of the metallic vessel therebetween, wherein adjacent circuits of the n−1 electrical circuits include an electrical flange of the n electrical flanges that forms a common electrical path to the adjacent electrical circuits, and wherein n is equal to or greater than 3;
establishing an alternating electrical current in each electrical circuit of the n−1 electrical circuits;
controlling a power dissipated in at least one portion of the metallic vessel comprising the n−1 electrical circuits by cutting the alternating electrical current supplied to the corresponding electrical circuit during each one-half cycle of the alternating electrical current in the corresponding electrical circuit; and
wherein a temperature of each of the n electrical flanges is less than a temperature of the at least one portion.

16. The method according to claim 15 , wherein n is equal to or greater than 4.

17. The method according to claim 15 , wherein an absolute value of a phase angle between at least two of the n−1 electrical currents is one of 0 degrees, 30 degrees, 60 degrees, or 120 degrees.

18. The method according to claim 15 , further comprising cutting the alternating electrical current supplied to each of the n−1 electrical circuits.

19. The method according to claim 15 , wherein the metallic vessel comprises platinum.

20. The method according to claim 15 , wherein the metallic vessel comprises a fining chamber.

Assignees

• Corning Inc

Inventors

• Chen Ying Pin
• Delamielleure Megan Aurora
• Hay Dennis Eugene
• He Chunhong Chelsie

Classifications

• C03B17/064

  by the overflow downdraw fusion process; Isopipes therefor · CPC title

• C03B5/225

  Refining (C03B5/18 takes precedence {; Refining agents C03C1/004}) · CPC title

• H05B3/62

  Heating elements specially adapted for furnaces (H05B3/60 takes precedence; arrangements of elements for electric heating in or on furnaces using ohmic resistance heating F27D11/02) · CPC title

• C03B5/235

  Heating the glass (C03B5/02, C03B5/18, C03B5/225 take precedence) · CPC title

• C03B7/07 Primary

  Electric means · CPC title