According to an aspect of the disclosure, a glass manufacturing system includes a hot-end subsystem, including: a submerged combustion melter that melts feedstock to produce molten glass; a stiller that receives the molten glass from the submerged combustion melter and that includes a stilling tank to still the molten glass and that is configured to control outflow of the stilled molten glass to effectively decouple viscosity of the molten glass from the flow rate of the molten glass and thereby control finer molten glass levels; and a finer that is mechanically decoupled from the stiller, and that receives and fines the stilled molten glass to produce fined molten glass. Many other aspects of the system are also disclosed and claimed.

A method of reducing bubble lifetime on the free surface of a volume of molten glass contained within or flowing through a vessel including a free volume above the free surface, thereby, minimizing re-entrainment of the bubbles back into the volume of molten glass and reducing the occurrence of blisters in finished glass products.

A method of reducing bubble lifetime on the free surface of a volume of molten glass contained within or flowing through a vessel including a free volume above the free surface, thereby, minimizing re-entrainment of the bubbles back into the volume of molten glass and reducing the occurrence of blisters in finished glass products.

An alkali-free glass substrate contains, as represented by mass % based on oxides: 54% to 66% of SiO.sub.2; 10% to 23% of Al.sub.2O.sub.3; 6% to 12% of B.sub.2O.sub.3; and 8% to 26% of MgO+CaO+SrO+BaO. The alkali-free glass substrate has β-OH of 0.15 mm.sup.−1 to 0.5 mm.sup.−1, and a Cl content of 0.1 to 0.35 mass %. A bubble growth index I of the alkali-free glass substrate given by the following formula is 280 or more: I=590.5×[β-OH]+874.1×[Cl]−5.7×[B.sub.2O.sub.3]−33.3. In the formula, [β-OH] is β-OH of the alkali-free glass substrate in mm.sup.−1, [Cl] is the Cl content of the alkali-free glass substrate in mass %, and [B.sub.2O.sub.3] is a B.sub.2O.sub.3 content of the alkali-free glass substrate in mass %.

Methods and systems for de-stabilizing foam produced in submerged combustion melters. A molten mass of glass and bubbles is flowed into an apparatus downstream of a submerged combustion melter. The downstream apparatus includes a floor, a roof and a wall connecting the floor and roof, but is devoid of submerged combustion burners and other components that would increase turbulence of the molten mass. The molten mass has foam on at least a portion of a top surface of the molten mass. One method includes directly impinging an impinging composition onto at least a portion of the foam in the downstream apparatus. Systems for carrying out the methods are described.

Methods and systems for de-stabilizing foam produced in submerged combustion melters. A molten mass of glass and bubbles is flowed into an apparatus downstream of a submerged combustion melter. The downstream apparatus includes a floor, a roof and a wall connecting the floor and roof, but is devoid of submerged combustion burners and other components that would increase turbulence of the molten mass. The molten mass has foam on at least a portion of a top surface of the molten mass. One method includes directly impinging an impinging composition onto at least a portion of the foam in the downstream apparatus. Systems for carrying out the methods are described.

The present invention concerns a method of determination of specific points of a rotary fibre forming spinner wheel (10) used in a fibre forming device (1), said method comprising the following steps: obtaining measurements of temperatures of the fibre forming spinner wheel obtained by means of a temperature measuring device (40) adapted to take measurements of temperatures of the spinner wheel at a plurality of angular positions of said measuring device in order to supply data to at least one calculation unit (30, 45) that constructs a curve representing the temperature as a function of the angular position of a temperature measuring device; processing said measurements by effecting a calculation of the second derivative of the curve of the temperature as a function of the angular position by means of a calculation unit (30); searching for at least one specific point for which the second derivative satisfies a predefined condition.

A method of producing glass includes drawing unrefined foamy molten glass from a glass melt held in a submerged combustion melter and introducing the unrefined foamy molten glass into a stilling chamber of a stilling tank. An intermediate pool of molten glass is held within the stilling chamber of the stilling tank and is heated therein by one or more non-submerged burners. Molten glass flows from the intermediate pool of molten glass to a transfer pool of molten glass held in a spout chamber of a feeding spout that is appended to the stilling tank. A molten glass feed can be drawn from the transfer pool of molten glass and delivered from the feeding spout at a controlled rate.

A method of producing glass includes drawing unrefined foamy molten glass from a glass melt held in a submerged combustion melter and introducing the unrefined foamy molten glass into a stilling chamber of a stilling tank. An intermediate pool of molten glass is held within the stilling chamber of the stilling tank and is heated therein by one or more non-submerged burners. Molten glass flows from the intermediate pool of molten glass to a transfer pool of molten glass held in a spout chamber of a feeding spout that is appended to the stilling tank. A molten glass feed can be drawn from the transfer pool of molten glass and delivered from the feeding spout at a controlled rate.

The present invention relates to a process for producing a boron containing glass, comprising melting raw materials including boron compounds in a submerged combustion melter (11), withdrawing flue gases from said melter and recovering heat from said flue gases in appropriate heat recovery equipment prior to release into the environment.