摘要:
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.
摘要:
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.
摘要:
A device for preheating charging material for glass melting installations using its exhaust gases, having a vertical preheating shaft through which a heat exchanger extends conducting exhaust gases, the shaft upper end having a charging material opening, the lower end having a preheated charging material discharge device, the inlet of the heat exchanger connected to an exhaust gas supply line and the outlet connected to an exhaust gas outlet line. To recuperate a high portion of the exhaust gas heat, and to reduce environmental contamination and the suctioning of environmental air as false air, the exhaust gas supply line has an outlet line branch for drawing oft part of the hot gases and the outlet line is connected to a downwardly open sealing gas line in the region of the charging material above the heat exchanger exhaust gas passage for the hot gas emission into the charging material.
摘要:
A continuously flowing glass stream is conditioned and homogenized along a conditioning stretch, which extends from an entry side to at least one extraction point, and at the beginning of which there is a cooling zone, to which a homogenizing zone for the glass temperature is connected. This method is preferentially used for the manufacture of molded glass articles, such as containers and pressed articles. In order to achieve the necessary conditioning and homogenization, even at high throughputs, the glass stream in the cooling zone has a cross section with a depth/width ratio D/W of a maximum 0.6 or 0.5, or 0.4, or 0.3, or 0.2, whereby the maximum depth Dmax amounts toa) 300 or 250 or 200 mm when the cooling zone is situated in a working end or in a distribution channelb) 150 or 120 or 100 mm when the cooling zone is situated in a feeder or in a forehearthand, at least 30, or 40 or 50% of that amount of energy which corresponds to the necessary temperature reduction is removed from the glass bath per meter of flow path at the beginning of the cooling zone.
摘要:
A plurality of conduit segments contact on another which run vertically and transversely to the direction in which molten glass is channelled. Each segment includes at least one trough section and at least one cover section, an insulation of individual formed bodies, and an external casing. The segments are coupled together on support beams and may have removable insulation at joints to facilitate inspection.
摘要:
In a furnace for melting glass, a preheating zone, a melting zone, a refining zone with a refining bank raised above the rest of the floor and an homogenizing zone, are arranged lengthwise behind one another between the charging end for the glass raw materials and a throat for the molten glass. The furnace chamber formed between two end walls is split up by dividing walls with the exception of flow paths for the glass and waste gases. The melting zone, the refining zone, several burners and the homogenizing zone have a common combustion chamber in the superstructure. A first flow path "L1" for the glass is defined between the inside face of the first end wall and the vertical center line (E) of the final dividing wall in front of the refining zone, and a second flow path "L2" is defined in the combustion chamber between the vertical center line (E) and the inside face of the second end wall. The ratio of the length "L2" to the total length ("L1"+"L2") is chosen to be at least 0.5, preferably at least 0.53. The lengths "L1" and "L2" are the horizontal components of the corresponding flow paths. The greater part of the heating energy is supplied to the glass melt in front of the refining bank in the melting zone, and the heating and melting energy for the raw materials is applied from above from the waste gases, and from below solely from the current in the glass melt which extends as far as the charging end. Therefore, the charging end of the melter does not require any electrical heating, at least during continuous operation.
摘要:
Process for vitrifying environmentally hazardous waste material in a glass melting furnace includes forming a batch including the waste material and no more than 30 weight percent additives including phonolite and SiO.sub.2 containing substances. A gall layer 2-5 cm thick including alkali salts or alkaline earth salts is produced on the molten glass, and batch is added so that a batch layer over 5 cm thick is formed on top of the gall layer. After the batch layer is formed, the molten glass is heated solely by electrodes, and the thickness of the batch layer is maintained to produce a steep enough temperature gradient therein so that the furnace atmosphere remains relatively cool, and substantially all of the condensable components which emerge from the molten glass condense in the batch layer.
摘要:
A glass melting furnace including a melting tank heated from above by burners and comprising a melting section as well as a refining and homogenizing section provided with electrodes for the supply of electrical energy; a dam which separates the melting section from the refining and homogenizing section and the upper edge of which is disposed below the surface of the (glass) melt bath; and an outlet for the glass disposed in the bottom portion of the refining and homogenizing section; wherein the bottom of the refining and homogenizing section is in a position deeper than the bottom of the melting section, and the electrodes are arranged in one or more planes (levels) of the refining section, the glass melting furnace being configured such that on the side of the refining section there is provided adjacent to the dam a bottom portion which is disposed at a level substantially above the bottom of the homogenizing section.
摘要:
In a glass melting furnace, a radiation screen wall is installed between a melting area and a refining area with a refining bank. This radiation screen wall leaves a flow path above the melt surface of the glass bath for the return flow of at least part of the combustion gases from the refining area to the melting area. In order to suppress a return flow of already refined and very hot glass melt from the refining area into a melting area, but still allow the charging material to melt completely as early as possible, the furnace is operated to produce at least one upward current between the middle of the melting area and the front face of the refining bank in the glass melt. Within the glass melt and before the melt surface is reached, this upward current is divided into a first partial current which flows upstream into the melting area and a second partial current which flows downstream over the refining bank, whereby a return current of the glass melt from the refining area into the melting area is prevented by the second partial current flowing downstream. This upward current is achieved by the use of one or more of the following arrangements: a row of bubblers; a step projecting upwards from the furnace bottom; and/or at least two heating electrodes which are installed before the front face of the refining bank.
摘要:
A continuously flowing glass stream is conditioned and homogenized along a conditioning stretch, which extends from an entry side to at least one extraction point, and at the beginning of which there is a cooling zone, to which at least one homogenizing zone for the glass temperature is connected. In the working end or the distribution channel the temperature is reduced from the entry temperature T1 to an outlet temperature T2. In order to achieve the necessary conditioning and homogenization, even at high throughputs, the glass stream in the at least one cooling zone of the working end or distribution channel has a cross section with a depth/width ratio D/W of a maximum 0.6, or 0.5, or 0.4, or 0.3 or 0.2, whereby the maximum depth Dmax amounts to 300 or 250 or 200 mm, achieved by at least one bank raised from the bottom, and at least 50, or 60, or 70% of that amount of energy which corresponds to the temperature difference between T1 and T2 is removed from the glass bath along the total length of all the cooling zones.