Systems and methods for making foamed glass using submerged combustion

• US 10,081,565 B2
• Filed: 02/21/2017
• Issued: 09/25/2018
• Est. Priority Date: 06/17/2010
• Status: Active Grant

• Current Assignee: Johns Manville Corporation (Berkshire Hathaway Incorporated)
• Original Assignee: Johns Manville Corporation (Berkshire Hathaway Incorporated)
• Inventors: Shock, Jeffrey M, Huber, Aaron Morgan, Swales, Timothy G
• Primary Examiner(s): Szewczyk, Cynthia
• Application Number:
  US15/437,597
• Publication Number:
  US 20170158544A1
• Time in Patent Office: 581 Days
• Field of Search: None
• CPC Class Codes: C03B 19/08 by foaming
• CPC Class Codes: C03B 2211/22 by direct combustion in the melt
• CPC Class Codes: C03B 2211/23 using oxygen, i.e. pure oxygen or oxygen-enriched air
• CPC Class Codes: C03B 37/01 Manufacture of glass fibres or filaments
• CPC Class Codes: C03B 5/2356 Submerged heating, e.g. by using heat pipes, hot gas or submerged combustion burners bubblers C03B5/193
• CPC Class Codes: Y02P 40/50 Glass production, e.g. reusing waste heat during processing or shaping

Abstract

Submerged combustion systems and methods of use to produce foamed glass. One system includes a submerged combustion melter having an outlet, the melter configured to produce an initial foamy molten glass having a density and comprising bubbles filled primarily with combustion product gases. The initial foamy molten glass is deposited directly onto or into a transport apparatus that transports the initial foamy molten glass to a downstream processing apparatus. An intermediate stage may be included between the melter and the transport apparatus. One intermediate stage is a channel that includes gas injectors. Another intermediate stage is a channel that produces an upper flow of a less dense glass and a relatively more dense glass lower flow. The upper flow may be processed into foamed glass products, while the more dense flow may be processed into dense glass products.

Claims

1. A submerged combustion system comprising:

a submerged combustion melter comprising a floor having a floor plan, a roof, a sidewall connecting the floor and roof, the floor, roof, and sidewall defining a single turbulent submerged combustion melting zone devoid of a fining zone, and one or more submerged combustion burners positioned uniformly in the melting zone, and an outlet, the melter configured to produce an initial foamy molten glass having a density and comprising bubbles filled primarily with combustion product gases,

the melter outlet configured to deliver the initial foamy molten glass directly onto a conveyor without refining, the conveyor configured to move the initial foamy molten glass to a processing apparatus, the conveyor forming a continuous ribbon of molten foamed glass having varying thickness and varying width as the ribbon passes over the conveyor.

2. The system of claim 1 comprising a lehr having a lehr inlet and a lehr outlet, the lehr configured and positioned about at least a portion of the conveyor to controllably cool and/or anneal the initial foamy molten glass.

3. The system of claim 1 wherein the conveyor is configured to allow the continuous ribbon thickness to generally decrease in a direction generally away from the melter outlet.

4. The system of claim 1 wherein the conveyor is configured to allow the continuous ribbon width to generally increase in a direction generally away from the melter outlet.

5. A submerged combustion system comprising:

a submerged combustion melter comprising a floor having a floor plan, a roof, a sidewall connecting the floor and roof, the floor, roof, and sidewall defining a single turbulent submerged combustion melting zone devoid of a fining zone, and one or more submerged combustion burners positioned uniformly in the melting zone, and an outlet, the melter configured to produce an initial foamy molten glass having a density and comprising bubbles filled primarily with combustion product gases,

the melter outlet configured to deliver the initial foamy molten glass onto a conveyor without refining, the conveyor configured to move the initial foamy molten glass to a processing apparatus,

the system comprising a stage intermediate the melter outlet and the conveyor, the intermediate stage configured to i) receive the initial foamy molten glass directly from the melter outlet; and

ii) allow the initial foamy molten glass to traverse through the intermediate stage and change, while traversing through the intermediate stage, into an initial product composition that comprises less uniformly distributed bubbles than the initial foamy molten glass.

6. The system of claim 5 wherein the intermediate stage comprises a refractory or refractory-lined channel configured to receive the initial foamy molten glass from the melter outlet and allow the initial foamy molten glass to traverse through to the conveyor.

7. The system of claim 6 wherein the channel comprises one or more gas injectors for injecting a gas into the initial foamy molten glass to form a foamy glass comprising generally decreasing density as measured generally away from the melter outlet.

8. The system of claim 7 wherein at least one of the gas injectors is positioned to deliver gas through a bottom of the refractory lined channel.

9. The system of claim 6 wherein the channel is configured having a width and a depth for forming a zonal flow comprising a generally less dense upper flow of molten glass having generally decreasing density measured from the melter outlet, and a generally denser lower flow of molten glass having generally increasing density measured from the melter, the densities compared to the density of the initial foamy glass.

10. The system of claim 9 comprising a weir over which the generally less dense upper flow of molten glass may flow over, the weir positioned just upstream of the conveyor, and an intermediate stage outlet positioned and configured to allow the generally denser lower flow of molten glass to exit the refractory lined channel.

11. A foamed glass product manufacturing system comprising:

a submerged combustion melter comprising a floor having a floor plan, a roof, a sidewall connecting the floor and roof, the floor, roof, and sidewall defining a single turbulent submerged combustion melting zone devoid of a fining zone, and one or more submerged combustion burners positioned uniformly in the melting zone, and an outlet, the melter configured to produce an initial foamy molten glass having a density and comprising bubbles filled primarily with combustion product gases, the melter outlet configured to deliver the initial foamy molten glass directly onto a conveyor without refining, the conveyor configured to move the initial foamy molten glass to a processing apparatus,

the conveyor configured to accept the initial foamy molten glass on it to form a continuous ribbon of molten foamed glass having varying thickness and varying width, and move the molten foamed glass into position for subsequent shaping into foamed glass products.

12. The system of claim 11 devoid of structure that would prevent the continuous ribbon thickness from generally decreasing in a direction away from the melter outlet, and the continuous ribbon width from generally increasing in a direction away from the melter outlet.

13. A foamed glass manufacturing system comprising:

a submerged combustion melter comprising a floor having a floor plan, a roof, a sidewall connecting the floor and roof, the floor, roof, and sidewall defining a single turbulent submerged combustion melting zone devoid of a fining zone, and one or more submerged combustion burners positioned uniformly in the melting zone, and an outlet, the melter configured to produce an initial foamy molten glass without refining having a density and comprising bubbles filled primarily with combustion product gases,

a refractory or refractory-lined channel configured to receive the initial foamy molten glass from the melter outlet and allow the initial foamy molten glass to traverse through it to a conveyor, the channel comprising one or more gas injectors for injecting a gas into the initial foamy molten glass to form a foamy glass comprising generally decreasing density as measured from the melter outlet to an inlet of the conveyor, and

the conveyor configured to accept the foamy molten glass of generally decreasing density on it to form a continuous ribbon of molten foamed glass having varying thickness and varying width and move it to a processing apparatus, optionally through a lehr upstream of the processing equipment.