Abstract: A melt tank for the production of a glass melt having a low portion of bubbles. The melt tank includes an inlet opening, an outlet opening, a floor, at least two side walls that adjoin the floor, a roof. The glass melt having a first bath depth in a melting segment, a second bath depth in a refining segment, and a third bath depth over a threshold between and smaller than the first and second bath depths. An electrically produced first heat energy is supplied via a multiplicity of electrodes that extend into the glass melt and a second heat energy is produced by the combustion of fossil fuel via at least one burner. Also, a method for producing a glass melt.

Abstract: A burner holder for a burner lance in a glass melting plant. To easily and quickly change the burner lance angle to influence the process conditions in the glass melting plant, the burner holder has a retaining unit for securing the burner lance and a sealing plate with a passage. The sealing plate is configured to secure to the glass melting plant and is provided with a recess for receiving a burner lance head. The recess forms at least one part of a passage through the sealing plate. The retaining unit is connected to the sealing plate via at least one first pivot bearing, such that the retaining unit can be pivoted or swiveled about a first axis of rotation. The pivot bearing is attached or embedded directly on the sealing plate or is connected to the sealing plate via a support arm arranged on the sealing plate.

Abstract: A burner holder for a burner lance in a glass melting plant. To easily and quickly change the burner lance angle to influence the process conditions in the glass melting plant, the burner holder has a retaining unit for securing the burner lance and a sealing plate with a passage. The sealing plate is configured to secure to the glass melting plant and is provided with a recess for receiving a burner lance head. The recess forms at least one part of a passage through the sealing plate. The retaining unit is connected to the sealing plate via at least one first pivot bearing, such that the retaining unit can be pivoted or swiveled about a first axis of rotation. The pivot bearing is attached or embedded directly on the sealing plate or is connected to the sealing plate via a support arm arranged on the sealing plate.

Abstract: A melt tank for the production of a glass melt having a low portion of bubbles. The melt tank includes an inlet opening, an outlet opening, a floor, at least two side walls that adjoin the floor, a roof. The glass melt having a first bath depth in a melting segment, a second bath depth in a refining segment, and a third bath depth over a threshold between and smaller than the first and second bath depths. An electrical produced first heat energy is supplied via a multiplicity of electrodes that extend into the glass melt and a second heat energy is produced by the combustion of fossil fuel via at least one burner. Also, a method for producing a glass melt.

Abstract: A glass melting plant refiner for thermal post-treatment of a glass melt containing bubbles, in particular for the production of fiberglass. To reduce the glass melt bubble content produced by submerged combustion burners, a refiner forms a glass melt tank, the glass melt flowing through the tank in a transport direction. The tank has a floor, side walls and a superstructure. A barrier, forming a raised floor part, runs essentially in the transport direction. The barrier forms, at each lateral side, a channel-shaped constriction with the side walls, a width of each constriction transverse to the transport direction being at most 0.45 times the tank width. At least one first fossil fuel heater heats the glass melt from above. At least one second electrical heating device, in each side wall and/or in the floor of the tank in the region of each constriction, extends into the glass melt.

Abstract: A glass melting plant having a melting tank having end-fired heating, the melting tank having a feeding material inlet, an outlet for removing the molten glass, and a melt surface of at least 40 m2. At least one doghouse is laterally situated and is connected to the melting tank inlet for feeding material input. The doghouse has side walls that, together with the melting tank inlet, limit a feeding surface area, and has a feeding device. The doghouse has a roof with an end wall oriented toward the feeding device, which end wall encloses, with the roof, a gas compartment open toward the melting tank. To increase the specific melting performance with at least equal glass quality, the feeding surface of the doghouse is at least 8 m2 and, given a melt surface of at least 115 m2, is at least 7% of the melting tank melt surface.

Abstract: A regenerative chamber for a glass melting furnace having a defined cross-section and wherein the regenerative chamber includes multiple slotted arches and above the same there are disposed transfer layers, and wherein a grating is installed on the transfer layers. A movable flow barrier is provided above the slotted arches that is inserted from the outside into the regenerative chamber and by means of which the cross-section of the regenerative chamber can be reduced.

Abstract: A glass melting tank comprising at least one front part for introducing the charge material, and at least one charging device. To reduce atmospheric heat losses and reduce dust transport into the upper furnace of the tank, and nevertheless to intensify the heating of the charge material, the front part has a length “LV” of at least 2,250 mm in the direction of the melting tank, and a length “LG” of at least 1,200 mm is provided with an insulating roof. An end wall near the charging device, together with the roof, encloses a gas chamber open toward the melting tank. A characteristic value “K” of 3.50 tonnes (t) per hour and per square meter of surface is not exceeded. The characteristic value is calculated from P/F, where P is the throughput per hour in tonnes (t) and F is the inner surface of the front part in m.

Abstract: A regenerator for glass melting tanks for storing waste heat from combustion cycles and emitting the stored heat to oxidation gases supplied from the outside, having a gas-permeable chamber lattice in which the chamber lining is made of fire-resistant stones held together by lateral wall elements. A cover region is situated over the chamber lattice for the combustion gases entering into the chamber lattice and for the oxidation gases exiting from the chamber lattice, the chamber cover forming a flow duct together with a further cover segment, connected to the cover, limited by a downward-extending terminating wall that is connected to the burner throat and with the wall element. A segment of the lateral wall element between the flow duct running essentially vertically and the upper region of the chamber lattice is fashioned as an intermediate wall having a cooling duct system situated therein.

Abstract: A glass melting plant refiner for thermal post-treatment of a glass melt containing bubbles, in particular for the production of fiberglass. To reduce the glass melt bubble content produced by submerged combustion burners, a refiner forms a glass melt tank, the glass melt flowing through the tank in a transport direction. The tank has a floor, side walls and a superstructure. A barrier, forming a raised floor part, runs essentially in the transport direction. The barrier forms, at each lateral side, a channel-shaped constriction with the side walls, a width of each constriction transverse to the transport direction being at most 0.45 times the tank width. At least one first fossil fuel heater heats the glass melt from above. At least one second electrical heating device, in each side wall and/or in the floor of the tank in the region of each constriction, extends into the glass melt.

Abstract: A glass melting plant having a melting tank having end-fired heating, the melting tank having a feeding material inlet, an outlet for removing the molten glass, and a melt surface of at least 40 m2. At least one doghouse is laterally situated and is connected to the melting tank inlet for feeding material input. The doghouse has side walls that, together with the melting tank inlet, limit a feeding surface area, and has a feeding device. The doghouse has a roof with an end wall oriented toward the feeding device, which end wall encloses, with the roof, a gas compartment open toward the melting tank. To increase the specific melting performance with at least equal glass quality, the feeding surface of the doghouse is at least 8 m2 and, given a melt surface of at least 115 m2, is at least 7% of the melting tank melt surface.

Abstract: A device for drying and preheating particulate feedstock for glass melting apparatuses including a vertical shaft in which a plurality of gas guides are arranged level by level. The shaft has at least one gas channel for exhaust gases from the melting apparatus. a) feedstock guide elements are arranged one above another within the shaft with lateral spacings on all sides, with a portion of the gas guides extending through the guide elements, b) at least one of the guide elements is mounted in a transversely movable fashion with respect to the shaft independently of other guide elements, c) the guide elements are provided with converging oblique surfaces for introducing the feedstock at upper ends of the guide elements and with converging oblique surfaces for the emergence of the feedstock at lower ends of the guide elements, and d) at least one guide element is connected to a vibrating drive.

Abstract: A regenerator for glass melting tanks for storing waste heat from combustion cycles and emitting the stored heat to oxidation gases supplied from the outside, having a gas-permeable chamber lattice in which the chamber lining is made of fire-resistant stones held together by lateral wall elements. A cover region is situated over the chamber lattice for the combustion gases entering into the chamber lattice and for the oxidation gases exiting from the chamber lattice, the chamber cover forming a flow duct together with a further cover segment, connected to the cover, limited by a downward-extending terminating wall that is connected to the burner throat and with the wall element. A segment of the lateral wall element between the flow duct running essentially vertically and the upper region of the chamber lattice is fashioned as an intermediate wall having a cooling duct system situated therein.

Abstract: A glass melting oven for producing a glass melt in a row arrangement, having a loading opening for raw glass materials, a melting region, a refining region, a constriction, a conditioning region and an overflow into a processing unit. To remove flaws from the melt that remain visible in the end product, a method includes the steps of a) arranging a refining bench between the melting region and the beginning of the refining region; b) arranging side burners and extraction openings for flue gases between the loading opening and the refining bench; c) delimiting the constriction at both ends by end walls that leave narrow flow cross-sections above the glass melt for flue gases; and d) cooling the glass melt inside the constriction. The glass melting oven is particularly suited for producing flat glass and panels for solar elements. The oxidants for the fuels may also be preheated.

Abstract: A glass melting tank comprising at least one front part for introducing the charge material, and at least one charging device. To reduce atmospheric heat losses and reduce dust transport into the upper furnace of the tank, and nevertheless to intensify the heating of the charge material, the front part has a length “LV” of at least 2,250 mm in the direction of the melting tank, and a length “LG” of at least 1,200 mm is provided with an insulating roof. An end wall near the charging device, together with the roof, encloses a gas chamber open toward the melting tank. A characteristic value “K” of 3.50 tonnes (t) per hour and per square meter of surface is not exceeded. The characteristic value is calculated from P/F, where P is the throughput per hour in tonnes (t) and F is the inner surface of the front part in m.

Abstract: A device for drying and preheating particulate feedstock for glass melting apparatuses including a vertical shaft in which a plurality of gas guides are arranged level by level. The shaft has at least one gas channel for exhaust gases from the melting apparatus. a) feedstock guide elements are arranged one above another within the shaft with lateral spacings on all sides, with a portion of the gas guides extending through the guide elements, b) at least one of the guide elements is mounted in a transversely movable fashion with respect to the shaft independently of other guide elements, c) the guide elements are provided with converging oblique surfaces for introducing the feedstock at upper ends of the guide elements and with converging oblique surfaces for the emergence of the feedstock at lower ends of the guide elements, and d) at least one guide element is connected to a vibrating drive.

Abstract: A regenerative chamber for a glass melting furnace having a defined cross-section and wherein the regenerative chamber includes multiple slotted arches and above the same there are disposed transfer layers, and wherein a grating is installed on the transfer layers. A movable flow barrier is provided above the slotted arches that is inserted from the outside into the regenerative chamber and by means of which the cross-section of the regenerative chamber can be reduced.

Abstract: A glass melting oven for producing a glass melt in a row arrangement, having a loading opening for raw glass materials, a melting region, a refining region, a constriction, a conditioning region and an overflow into a processing unit. To remove flaws from the melt that remain visible in the end product, a method includes the steps of a) arranging a refining bench between the melting region and the beginning of the refining region; b) arranging side burners and extraction openings for flue gases between the loading opening and the refining bench; c) delimiting the constriction at both ends by end walls that leave narrow flow cross-sections above the glass melt for flue gases; and d) cooling the glass melt inside the constriction. The glass melting oven is particularly suited for producing flat glass and panels for solar elements. The oxidants for the fuels may also be preheated.