434results about "Forehearths" patented technology

A front end for a glass forming operation comprises an open channel and at least one burner. The channel has at least one surface. The surface has at least one hole therein. The burner is oriented in the hole at an acute angle relative to the surface. In another embodiment of the invention, the channel has a top and a pair of sidewalls each having a surface. At least one hole is in at least one of the surfaces. The hole is at an acute angle relative to at least one surface. The burner is an oxygen-fired burner. In yet another embodiment of the invention, the top and sidewalls each have a super structure surface constructed of refractory material. The channel has an upstream end and a downstream end. At least one of the surfaces has a plurality of holes therein. The burners extend at an acute angle relative to at least one surface and in a plane extending between the upstream end and the downstream end and perpendicular to at least one surface. Oxygen-fired burners extend axially through corresponding holes.

Processes of controlling submerged combustion melters, and systems for carrying out the methods. One process includes feeding vitrifiable material into a melter vessel, the melter vessel including a fluid-cooled refractory panel in its floor, ceiling, and/or sidewall, and heating the vitrifiable material with a burner directing combustion products into the melting zone under a level of the molten material in the zone. Burners impart turbulence to the molten material in the melting zone. The fluid-cooled refractory panel is cooled, forming a modified panel having a frozen or highly viscous material layer on a surface of the panel facing the molten material, and a sensor senses temperature of the modified panel using a protected thermocouple positioned in the modified panel shielded from direct contact with turbulent molten material. Processes include controlling the melter using the temperature of the modified panel. Other processes and systems are presented.

A method of forming high strength glass fibers in a refractory-lined glass meter, products made there from and batch compositions suited for use in the method are disclosed. The glass composition for use in the method of the present invention is up to about 64-75 weight percent SiO₂, 16-24 weight percent Al₂O₃, 8-12 weight percent MgO and 0.25-3 weight percent R₂O, where R₂O equals the sum of Li₂O and Na₂O, has a fiberizing temperature less than about 2650° F., and a ΔT of at least 80° F. By using oxide-based refractory-lined furnaces the cost of production of glass fibers is substantially reduced in comparison with the cost of fibers produced using a platinum-lined melting furnace. High strength composite articles including the high strength glass fibers are also disclosed.

Apparatus including a flow channel defined by a floor, roof, and sidewall structure connecting the floor and roof. One or more combustion burners is positioned in either the roof, the sidewall structure, or both, and transfer heat to a molten mass of glass containing bubbles having a bubble atmosphere flowing through the flow channel. The burners contribute to formation of a channel atmosphere above the molten glass. Apparatus includes a device, at least a portion of which is positionable under a level of the molten glass in the flow channel, configured to emit a composition into the molten glass under the level to intimately contact the composition with the molten glass and bubbles therein. The composition diffuses into the bubbles to form modified atmosphere bubbles sufficiently different from the channel atmosphere to increase diffusion of a species in the channel atmosphere into the modified atmosphere bubbles.

An oxy-gaseous fuel burner for a forehearth system having an oxygen conduit, a fuel conduit disposed concentrically within the oxygen conduit and forming an annulus between the fuel conduit and the oxygen conduit, a precombustor conduit disposed at the oxygen outlet end of the oxygen conduit, and a fuel tip disposed at the fuel outlet end of the fuel conduit. The outlet of the fuel tip is disposed at or upstream of the inlet to the precombustor conduit.

There is provided a method for electrically energizing and heating a platinum or platinum-alloy composite tube structure having a structure including a first main tube, a second main tube, and a branch tube connecting the first main tube and the second main tube, which prevents a local part of the branch tube from being electrically energized and heated in an excessive or insufficient manner. There is provided a method for electrically energizing and heating a platinum or platinum-alloy composite tube structure having a structure including a first main tube, a second main tube, and a branch tube connecting the first main tube and the second main tube, the method comprising dividing an energizing path for the branch tube into a first energizing path from the first main tube to the branch tube and a second energizing path from the branch tube to the second main tube; and performing energization control for the first energizing path and energization control for the second energizing path independently of each other.

A hollow tubular body for molten glass by which local-overheating in the electrode for conduction heating is prevented. A hollow tubular body having a platinum or platinum alloy hollow tube, used for conduction heating is characterized in that a ring electrode is joined to the outer circumference of the hollow tube, at least one lead-out electrode is joined to an outer edge of the ring electrode, and the ring electrode comprises a core portion of electrode of platinum or platinum alloy and a thick portion of platinum or platinum alloy or of a metallic material other than platinum or platinum alloy, provided at an outer side of the core portion of electrode.

A method and apparatus for the conditioning and homogenization of glass melts that are transported in flow channels with a vertical central longitudinal plane and side walls, by using the effect of alternating cross-section changes in the flow direction and stirrers with vertical stirrer shafts installed in the flow direction. The glass melt is transported through at least one flow channel, in which cross-section changes on both sides are created by several consecutive protrusions installed in the flow direction. The protrusions are directed towards the central longitudinal plane and on their upstream sides and downstream sides have wall areas that are arranged at such an angle to the central longitudinal plane, that no right-angled or acute-angled corners are created in the flow channel. The stirrers are installed between consecutive downstream sides and the upstream sides of the protrusions.

A molten glass delivery system is modified to match it with the overflow downdraw process. A substantial number of defects not removed by the finer are diverted to the unusable inlet and distal edges of the sheet. In one embodiment, the stirring device is relocated from the outlet to the inlet of the finer. In another embodiment, the basic shape of the finer is preferably changed from a cylindrical shape to a Double Apex (or Gull Wing) shaped cross-section, whereby the apexes of the finer contain the glass that will form the unusable inlet end of the glass sheet. The finer vent or vents are preferably located at these apexes such that any homogeneity defects caused by the vents are diverted to the unusable inlet end of the glass sheet. The finer cross-section has a high aspect ratio for increased fining efficiency as compared to a cylindrical finer.

The invention relates to a treatment method of a glass metal in a platinum channel for reaching satisfactory clarification effect hardly reached by a common clarifying process. The treatment method of the glass metal in the platinum channel solves the problems of low quality and low efficiency of a process which requires a clarification temperature over 1600 DEG C. The invention fully integrates a clarifying process, a homogenating process, a homogenizing process and a power supply process to carry out in the platinum channel. According to different functions and conditions of different parts, the platinum thickness is 0.8-3 mm, the special stability of platinum is utilized to realize high-temperature clarification which can realize the high-quality glass metal hardly obtained by a common tank furnace, and the classified glass metal is basically in a full-closed state without external pollution or glass component volatilization so as to ensure the evenness of the glass metal components and realize the full evenness of the glass metal component by stirring in match. Fireproof insulated materials of different thicknesses are arranged at the outer side of the platinum according to different aims of different sections.

The present invention provides an improved apparatus for forming sheet glass, wherein the apparatus includes a reservoir from which to provide molten glass, an inlet plate in fluid communication with the reservoir to receive the molten glass from the reservoir in a flow direction, the inlet pipe having a cross-sectional area orthogonal to the fluid direction, and a trough in fluid communication with the inlet pipe to receive the molten glass and that is operably coupled to a wedge-shaped sheet forming structure to form the molten glass into a glass sheet. The improvement comprises a bowl that provides fluid communication between the inlet pipe and the trough, the bowl having a cross-sectional area orthogonal to a fluid direction at the molten through the bowl that is equal to or less than the cross-sectional area of the inlet pipe, thereby preventing stagnation of the molten glass within the bowl. Another embodiment of the present invention is a method that utilizes the inventive apparatus to form glass sheet.

Channel apparatus for use with submerged combustion systems and methods of use to produce glass. One channel apparatus includes a flow channel defined by a floor, a roof, and a wall structure connecting the floor and roof, the flow channel divided into sections by a series of skimmers. Channel apparatus include both high and low momentum combustion burners, with one or more high momentum combustion burners positioned immediately upstream of each skimmer in either the roof or sidewall structure, or both, and one or more low momentum combustion burners positioned immediately downstream of each skimmer in either the roof, the sidewall structure, or both, and positioned to transfer heat to the molten mass of glass without substantial interference from foamed material. Certain embodiments include increased height of glass-contact refractory, in particular immediately upstream of the skimmers.

Forehearths that create a substantially homogeneous temperature to molten glass forming materials across the end position are provided. A gas cavity, a weir, a refractory block, or a heating element in the forehearth may be utilized to reduce a temperature gradient of molten glass forming materials across the end position. Reducing the temperature difference of the molten glass forming material across the end position permits for improved chemical and physical properties of the glass fibers and the end products formed from the glass fibers. In addition, a reduction in the temperature gradient across the end position produces a more homogenous glass fiber and glass product. Further, a reduction in the shear break rate occurs when the molten glass forming material has a temperature that is substantially the same across the end position, which results in a reduction in the breakage of glass fibers and an increase in manufacturing efficiency.

The invention relates to a tank furnace for producing basalt continuous filament and pertains to the technical field of novel inorganic non-metallic material processing equipment, the main characteristics are that the furnace body consists of a melting tank and material channels, the melting tank and the material channels are connected by non-submerged dog-holes, the melting tank is divided into a melting area and a homogenization area, a burner is arranged at the top of the furnace vertically, the burner guns of melting area and the feeding pipes are arranged in intervals, and the strong melting area of even feeding and even heating is formed. The material channels are arranged in three directions in the homogenization area of the melting tank, burner guns are arranged in the material channel in sections, the temperature of the fused mass in the material channels is guaranteed, more than 12 wiredrawing shaping areas are evenly arranged in each material channel so as to supply basalt melt mass for the wiredrawing bushing well, emptying devices are arranged at the tail part of the melting tank and the tail parts of all material channels, during the operation, the operation of discharging the meltwater can be carried out when impurities are stored in the meltwater for a long time or the varieties of raw materials are changed. The invention is in favor of improving the quality and industrialized production of the basalt continuous filament.

The invention belongs to the technical field of display glass production equipment and particularly relates to a double platinum channel structure for an ultrathin glass substrate. For the double platinum channel structure, by utilizing a platinum channel in the prior art, a platinum channel main body is divided into an inlet connection section, a high-temperature clarification section, a transition connection section and a stirring section which are sequentially connected with one another; by arranging two outlets at the stirring section and improving the structure on matching adaptability, on the premise without influencing the existing production capacity of the platinum channel, the flowrate requirements that matching formation can be performed, and ultrathin TFT-LCD (Thin Film Transistor-Liquid Crystal Display) liquid crystal glass is produced are met, and the problems of uncontrollable quality indexes, including stress, warping and thickness difference, of a glass product causedby large flowrate, rapidness in glass plate speed, insufficiency in formation technology time, when the ultrathin glass is produced by original equipment are solved; in addition, on the premise of realizing the production capacity of two production lines, the usage amount of platinum is greatly reduced; and as the two production lines share the platinum channel at the front end, the investments ofpersons, equipment and plants can be greatly reduced.

An oxy-fuel burner arrangement having a first conduit having a nozzle aperture with an aspect ratio, D1/D2, of greater than or equal to about 2.0. The first conduit is arranged and disposed to provide a first fluid stream, where the first fluid stream is a combustible fuel. The burner arrangement further includes at least one second conduit arranged and disposed to provide a second gas stream circumferentially around the first fluid stream, where the second gas stream includes oxygen. A precombustor is arranged and disposed to receive the first fluid stream and second gas stream where an oxy-fuel flame is produced. The geometry of the nozzle aperture and the cross-sectional geometry of the first conduit are dissimilar.

Objective of the present invention is to provide a glass melting furnace, a process for modifying a glass melt and a process for producing glass melt, whereby composition-modified glass melt containing an additive component at a high concentration can be produced with an excellent quality. The glass melting furnace 10 of the present invention is a glass melting furnace 10 for adding an additive to a molten state glass to form composition-modified glass melt, discharging the composition-modified glass melt, and a forehearth 20, said forehearth comprising a feed portion to feed an additive, and a heating means to form a heating gas phase portion above the liquid surface of the glass melt to convert the additive from the feed portion into melted particles of additive below the feed portion.

The invention discloses a glass production device and a forming process method. The glass production device comprises (1) a mixing device, (2) a melting device, (3) a cooling operating part device and (4) a forming device, wherein the mixing device is used for mixing glass raw materials; the melting device is used for melting mixed glass raw materials, and discharging air bubbles of a glass liquid; the cooling operating part device is used for homogenizing, clarifying and cooling the glass liquid, the middle lower layer of the cooling operating part device is provided with 2-100 electric heating devices and temperature measuring devices, and the distance between each electric heating device and each temperature measuring device ranges from 0.2 m to 6 m; electric heating devices and temperature measuring devices are installed in the range of 0.1 m to 1.5 m at the left corner or the right corner, close to the forming device, of the middle lower layer of the cooling operating part device; and the forming device is used for preparing the cooled glass liquid into a glass product.