CN211284131U - Glass liquid guiding device and glass liquid guiding channel - Google Patents
Glass liquid guiding device and glass liquid guiding channel Download PDFInfo
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- CN211284131U CN211284131U CN201922319440.4U CN201922319440U CN211284131U CN 211284131 U CN211284131 U CN 211284131U CN 201922319440 U CN201922319440 U CN 201922319440U CN 211284131 U CN211284131 U CN 211284131U
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Abstract
The utility model provides a glass liquid guiding device can effectively solve the glass defect that surface layer problems such as glass liquid top layer impurity, inhomogeneity lead to improve product quality. The glass liquid flow guiding device comprises a lower baffle plate and an upper baffle plate, wherein the upper baffle plate is arranged on the lower baffle plate, the front surface of the upper baffle plate is a front wall, the rear surface of the upper baffle plate is a rear wall, the top surface of the lower baffle plate is an upper wall, the front surface of the lower baffle plate is a front side wall, the bottom surface of the lower baffle plate is a bottom wall, and the front wall is a curved surface formed by a cylindrical surface, a paraboloid and a spline curve. The utility model discloses a set up glass liquid guiding device in the passageway, effectively reduced the flow resistance on glass liquid surface impurity layer in the passageway to divide into two parts about the flow of glass liquid in the passageway, make the nearly top layer impurity water conservancy diversion of glass liquid get rid of in the passageway, effectively solved the long easy problem that enrichment impurity formed the inhomogeneous impurity layer of glass of surface edge portion glass liquid dwell time in the passageway, can stably improve glass product quality.
Description
Technical Field
The utility model relates to a connect the guiding device on melting tank to forming device's glass liquid passageway and passageway in the glass production process, thereby utilize this guiding device to get rid of inhomogeneous composition in the glass liquid in the passageway and improve the glass liquid quality.
Background
At present, in common glass production processes of optical glass, float glass, bottle glass and the like, the production mainly comprises the processes of melting, clarifying, homogenizing, forming, annealing, packaging and the like of molten glass in a melting furnace, bubbles in the glass need to be removed before the molten glass is conveyed to the forming process, and the internal temperature and components of the glass are uniformly distributed, so that the indexes of the glass quality influenced by the fluctuation of physicochemical constants of formed glass products, the quantity of bubbles in the products, stone defects and the like are effectively controlled. The glass liquid can be conveyed from the melting tank to the forming device in a way of a channel made of noble metal, a refractory material channel, a channel formed by combining the noble metal and the refractory material and the like, wherein the precious metal pipeline is adopted to convey the glass liquid and has the difficulties of high cost, complex design, high control precision and the like, so the glass liquid is generally used in the production process of optical glass and other high value-added glass. In the general glass production process, refractory material channels are mainly adopted to convey molten glass, and precious metal materials are locally used to improve the quality of the molten glass. When the refractory material channel is adopted to convey molten glass, the two conditions are generally divided into two conditions, namely full channel conveying and a conveying mode of forming a free surface in the channel, and only part of conveying channels can realize full channel conveying generally due to process requirements in the production process, and most of the conveying modes adopt the conveying mode with the free surface.
In the process that the glass liquid enters the forming device from the melting tank, if a glass liquid conveying mode with a free surface is locally adopted, the flow rate is generally slow and belongs to laminar flow, so that the glass liquid in the channel flows orderly, and the surface glass liquid only enters the glass liquid through diffusion. The glass liquid forms a free surface in the channel, so that the contact between the glass liquid of the near-surface layer and air causes volatile components in the glass liquid, such as alkali metal (Na, K) oxides, fluorides, borides and the like to enter hot air through the surface of the glass liquid at high temperature to form volatile matters, and the volatile matters are condensed when meeting the top or the cooler part of the side wall to form small solid particles and are attached to the surface of the glass; meanwhile, partial glass component ions are separated from the glass liquid in the volatilization process, so that the surface component and the central glass liquid of the glass liquid are different, and the viscosity, the density and other physicochemical properties of the glass liquid and the central glass liquid are different. Through the change process, the glass liquid easily forms a layer of impurity-rich and inhomogeneous glass liquid layer on the surface layer, and the glass liquid layer can form the defects of stripes, stones and the like during glass forming once the glass liquid layer is not processed in time, so that the production quality of the glass is influenced. The volatilization process is particularly prominent in the production of special float glass (such as aluminosilicate glass and borosilicate glass), optical glass and boron-containing low-expansion glass, and the problem of the surface layer of the glass is more serious when the volatile matter volatilization amount is larger as the residence time of the molten glass in an open channel is longer.
CN203212450U provides a glass liquid guiding device to solve the problem of glass rib caused by high viscosity glass liquid in the float glass production process, the guiding device guides the surface layer high viscosity glass liquid to two sides of a flow channel to achieve the effect of improving the glass quality problem, the method is suitable for float forming method, but when other forming methods are adopted, the problem still exists in the edge glass liquid. CN202543030U, CN203461950U, CN203429040U, etc. disclose that the homogenization treatment of the molten glass is performed by stirring in the channel, and the homogenization of the molten glass is improved by stirring, but when the molten glass has a free surface, the residence time of the surface layer molten glass in the channel is much shorter than the time required for homogenizing the unit molten glass, so the effect of solving the problem of the surface layer molten glass uniformity by stirring in the channel is very limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a glass liquid guiding device is provided, the device can effectively solve the glass defect that glass liquid top layer impurity, surface layer problems such as inhomogeneous result in to improve product quality.
The utility model discloses still need to provide an utilize the passageway of above-mentioned glass liquid guiding device water conservancy diversion top layer glass liquid.
The utility model provides a technical scheme that technical problem adopted is: the glass liquid flow guiding device comprises a lower baffle plate and an upper baffle plate, wherein the upper baffle plate is arranged on the lower baffle plate, the front surface of the upper baffle plate is a front wall, the rear surface of the upper baffle plate is a rear wall, the top surface of the lower baffle plate is an upper wall, the front surface of the lower baffle plate is a front side wall, the bottom surface of the lower baffle plate is a bottom wall, and the front wall is a curved surface formed by a cylindrical surface, a paraboloid and a spline curve.
Furthermore, the front wall is composed of two curved surfaces, the included angle theta formed by the intersection of the two curved surfaces is 5-90 degrees, and the two curved surfaces are symmetrical to the intersection line.
Further, the upper wall is divided into three regions, a central region is located in the channel and adjacent to the front wall and the front side wall; the left side area is adjacent to the left diversion angle and is partially embedded into the left side wall; the right side area is adjacent to the right diversion angle and is partially embedded into the right side wall.
The glass liquid flow guide channel comprises a channel, a discharge pool and the glass liquid flow guide device, wherein the left end and the right end of the glass liquid flow guide device are respectively embedded into the left side wall and the right side wall of the channel, and the glass liquid flow guide device is connected with the discharge pool.
Furthermore, the channel comprises a left side wall, a right side wall, a molten glass inlet, a molten glass outlet and a channel bottom wall, wherein a left side groove and a right side groove are respectively arranged on the left side wall and the right side wall, and a left flow guide angle and a right flow guide angle are respectively arranged on the left side groove and the right side groove.
Further, a layer of metal material is wrapped on the surface of the molten glass flow guide device, and the thickness of the metal material wrapping layer is 0.5mm-1.0 mm; the glass liquid guiding device selects the coefficient of thermal expansion as 9.1 KHz 10-6K-1～13.5Х10-6K-1Is made of the refractory material.
Further, the metal material wrapping layer is made of pure platinum metal, platinum-rhodium alloy or platinum-gold alloy.
Furthermore, a left discharge pool and a right discharge pool are respectively arranged on two sides of the molten glass guiding device, and the left discharge pool is connected with the left area of the upper wall; the right discharge tank is connected to the right region of the upper wall.
Further, the discharge pool comprises a discharge side wall, a discharge bottom wall and a discharge port, the discharge port is a discharge pipe or an overflow port, and the discharge pipe is arranged on the discharge bottom wall or the discharge side wall.
Furthermore, the deformation amount of the molten glass flow guide device in the vertical direction is not more than 3% of the width of the molten glass channel spanned by the molten glass flow guide device.
The utility model has the advantages that: the glass liquid guiding device is arranged in the channel, so that the flow resistance of an impurity layer on the surface of the glass liquid in the channel is effectively reduced, the flow of the glass liquid in the channel is divided into an upper part and a lower part, and the impurities near the surface layer of the glass liquid in the channel are guided and removed, so that the glass quality level of a subsequent production link is improved; the adoption of the bilateral diversion discharge mode further reduces the local flow resistance of the surface glass liquid on the edge part near the side wall of the channel and shortens the flow path, thereby accelerating the discharge speed of the surface glass liquid on the wall surface, effectively solving the problem that the glass liquid on the edge part of the surface in the channel is easy to enrich impurities to form a glass heterogeneous impurity layer with long retention time, and being capable of stably improving the quality of glass products.
Drawings
FIG. 1 is a schematic view of a conventional glass production process.
FIG. 2 is a schematic view of another prior art glass production process.
Fig. 3 is a schematic structural view of the molten glass guiding passage of the present invention.
Fig. 4 is a schematic structural diagram of the channel of the present invention.
Fig. 5 is another schematic diagram of the channel of the present invention.
Fig. 6 is a third structural schematic diagram of the channel of the present invention.
Fig. 7 is a schematic structural view of the molten glass guiding device of the present invention.
Fig. 8 is another schematic structural diagram of the molten glass guiding device of the present invention.
Fig. 9 is a third schematic structural diagram of the molten glass guiding device of the present invention.
Fig. 10 is a schematic structural view of the drain tank of the present invention.
Fig. 11 is another schematic structure of the drainage basin of the present invention.
Fig. 12 is a schematic view of a third structure of the drainage basin of the present invention.
Detailed Description
The glass production process is mainly divided into two parts, namely a thermal technology and a cold technology. The thermal technology mainly converts the glass powder into liquid at high temperature, and forms a glass product through melting, clarification, homogenization, molding and annealing, and the key equipment corresponding to the technology generally comprises a melting tank, a clarification tank, a channel, a homogenization tank, a molding device, an annealing device and the like, as shown in figures 1 and 2. The process position schematic diagram of two molten glass channels is provided for the matched process setting, the channels are used as transition areas of each important production link and can appear at different positions according to design requirements, and the molten glass channels can have partial functions of equipment such as a clarification tank and a homogenization tank and can also be used for controlling the temperature change of molten glass. The design of the channel can be divided into two types according to the difference of the glass flow power, namely a full-tube type molten glass channel and a molten glass channel with a free surface. For a channel with a free surface, factors such as glass residence time, spatial atmosphere composition, atmosphere pressure, glass composition and the like all influence the physicochemical properties such as molten glass density, viscosity and the like of molten glass adjacent to the free surface, so that a surface layer of the molten glass with the free surface is easy to form an uneven impurity defect layer relative to the main molten glass.
The glass liquid diversion channel of the utility model is shown in figure 3, and comprises a channel 1, a glass liquid diversion device 2 and a discharge pool 3, wherein the left end and the right end of the glass liquid diversion device 2 are respectively embedded into a left side wall 11 and a right side wall 12 on the channel 1, and the left side wall 11 and the right side wall 12 support and fix the glass diversion device 2; the glass liquid guiding device 2 is connected with the discharge pool 3. When the glass liquid stably flows in the channel, the glass liquid is divided into two areas by the glass liquid guiding device 2, the glass liquid higher than the upper bottom wall of the glass liquid guiding device 2 is guided to enter the discharging pool 3 and is discharged by a discharging pipe or an overflow port of the discharging pool 3; and the molten glass lower than the upper bottom wall of the molten glass guiding device 2 continues to enter the next production procedure along the channel 1, so that surface molten glass which is easy to cause quality problems is removed, and high-quality molten glass is left.
The channel 1 comprises a left side wall 11, a right side wall 12, a molten glass inlet 13, a molten glass outlet 14 and a channel bottom wall 15, wherein a left groove 16 and a right groove 17 are respectively arranged on the left side wall 11 and the right side wall 12, and a left diversion angle 18 and a right diversion angle 19 are respectively arranged on the left groove 16 and the right groove 17, as shown in fig. 4-5; the channel 1 may be further provided with a rear side wall 20, and the molten glass outlet 14 is arranged on the rear side wall 20, as shown in fig. 6; the utility model discloses a passageway 1 can be right angle passageway, fillet passageway and binding off passageway, and is shown in fig. 4-6 respectively, and glass liquid all flows into passageway 1 from glass liquid entry 13, flows out passageway 1 from glass liquid export 14 behind 1 each structure of passageway, gets into next production processes.
The positions and sizes of the left groove 16 and the right groove 17 on the left wall 11 and the right wall 12 are determined by the positions and sizes of the molten glass guiding device 2 and the discharge tank 3. The left diversion angle 18 and the right diversion angle 19 can select a chamfer and a fillet during design and processing, and the fillet is preferred; controlling the radius of the chamfer to be smaller than the length of the channel 1 in the glass flowing direction during chamfering; the left flow guide angle 18 and the right flow guide angle 19 are designed according to the flow state of glass liquid in numerical analysis calculation and field actual production, the glass liquid at the edge part of the surface layer is influenced by the wall surface resistance, and the flow speed is far lower than that of the glass liquid at the central surface, so that the local flow resistance of the glass liquid at the edge part of the surface layer can be reduced by adopting the left flow guide angle 18 and the right flow guide angle 19, the flow path is shortened, the discharge speed of the glass liquid at the adjacent wall surface of the surface is effectively accelerated, and the glass liquid at the edge part of the surface is prevented from being gathered to form a glass inhomogeneous impurity layer.
The shape of the channel 1 can be designed into a structure with the cross section shapes of a circular cross section, an oval cross section, a polygonal cross section and the like besides the right-angle channel, the fillet channel and the closing-in channel, and the shape of the channel 1 mainly depends on the requirements of the glass production process. When the channel is not completely filled with molten glass, the molten glass has a free surface in the channel and forms a liquid level line at the interface of the three phases of gas, liquid and solid at the left side wall 11 and the right side wall 12 of the channel 1. The size design of the channel 1 can be based on the field construction conditions, the residence time of the glass liquid in the process, the glass liquid flow, the transverse section temperature difference and other process parameters to design the length, width and height of the channel 1.
As shown in fig. 7-9, the glass liquid guiding device 2 includes a lower baffle plate 21 and an upper baffle plate 22, the upper baffle plate 22 is disposed on the lower baffle plate 21, wherein the front surface of the upper baffle plate 22 is a front wall 23, the rear surface of the upper baffle plate 22 is a rear wall 24, the top surface of the lower baffle plate 21 is an upper wall 25, the front surface of the lower baffle plate 21 is a front side wall 26, and the bottom surface of the lower baffle plate 21 is a bottom wall 27. The upper wall 25 is divided into three regions, a central region 28 located within the channel 1 adjacent the front wall 23 and the front side wall 26 and being fully immersed in the molten glass during operation; the left side region 29 is adjacent to the left diversion angle 18 and is partially embedded in the left side wall 11, and the rest is immersed by the molten glass; the right side region 30 is adjacent the right horn 19 and is partially embedded in the right sidewall 12, with the remainder being submerged by the molten glass. The front side wall 26 is also divided into three regions, a left region and a right region respectively disposed in the left tank 11 and the right tank 12, and a middle region completely immersed in the molten glass. The front wall 23 is only partially immersed in the molten glass and forms a boundary with the surface of the molten glass, so that the height of the front wall 23 must be higher than the height of the liquid level of the molten glass, and the design height of the front wall 23 is not more than 2 times the maximum height of the liquid level of the molten glass, when the upper wall 25 is at the zero standard height position.
The material of the molten glass guiding device 2 can be selected according to the components of the glass and the using temperature of the position, and can be made of refractory bricks made of magnesia-alumina spinel, fused corundum bricks, high-zirconium bricks, fused quartz and other refractory materials, or can be made of metal materials directly, but the material which does not pollute the molten glass is selected when the metal is made. In addition, when the molten glass guiding device 2 is made of refractory materials, a layer of metal materials can be wrapped on the surface of the molten glass guiding device 2, and the height of the metal material wrapping layer is not lower than the liquid level line formed by intersection of molten glass and the molten glass guiding device 2. The metal material wrapping layer is mainly used for resisting the erosion of the molten glass to the molten glass guiding device 2, keeping the shape and the stress structure of the molten glass guiding device 2 unchanged in the using process, keeping the guiding effect on the molten glass and prolonging the service life of the molten glass guiding device 2. The thickness of the metal material wrapping layer is 0.4mm-2.0mm, and the optimal thickness is 0.5mm-1.0 mm. The metal material wrapping layer can be made of pure platinum metal with stable high-temperature performance, and can also be made of platinum-rhodium alloy with more excellent strength and stable high-temperature performance, wherein the content of rhodium in the platinum-rhodium alloy is 6-14% (weight percentage content, the same below), and the optimal content is 8.5-11.5%. The metal material wrapping layer can also be made of platinum alloy which has excellent strength and stable high-temperature performance and can improve the wetting angle of the glass liquid to the metal material wrapping layer, wherein the content of the gold in the platinum alloy is 2.5-11.5%, the optimal content is 5.5-7.5%, and the improvement of the wetting angle is beneficial to reducing the adhesion amount of the glass liquid on the wrapping layer and preventing crystallization.
When the molten glass diversion device 2 is wrapped by metal, the body of the molten glass diversion device 2 is preferably made of a refractory material with a thermal expansion coefficient close to that of the metal material wrapping layer, and the preferred refractory material has a thermal expansion coefficient of 6 to 10, considering the combination gap between the body of the molten glass diversion device 2 and the metal material wrapping layer and preventing the problems of bulging, breakage and the like of the two materials due to large difference of the thermal expansion coefficients-6K-1～14Х10-6K-1Most preferably, the coefficient of thermal expansion is 9.1 KHz 10-6K-1～13.5Х10-6K-1。
When the glass liquid guiding device 2 is used for guiding the glass liquid and the upper wall 25 is at a zero standard height, when the average liquid level height of the glass liquid above the upper wall 25 is lower than 5mm, the guiding effect is greatly reduced due to the wall surface friction force of the upper wall 25; when the liquid level is more than 200mm, the glass liquid on the upper wall 25 is too much, so that a large amount of high-quality glass is drained in a diversion way, and the removal amount of surface impurity glass liquid in unit time is greatly reduced. Therefore, when the upper wall 25 is at zero standard height, the liquid level of the molten glass on the upper wall 25 should be controlled to be 5mm to 200mm, preferably 10mm to 100mm, and most preferably 25mm to 60 mm.
The front side wall 26 is determined according to the material used for the molten glass guiding device 2. When the glass liquid guiding device 2 is coated with the precious metal, the lowest height of the front side wall 26 can be designed to be zero, and the preferred height of the front side wall 26 is 0-100 mm; when refractory material is used to directly form the molten glass guiding device 2, the height of the front side wall 26 is any value of the distance from the upper wall 25 to the bottom wall 27, and preferably the height of the front side wall 26 is the minimum distance from the upper wall 25 to the bottom wall 27.
The front wall 23 serves to guide the molten glass flowing parallel to the channel 1 to a direction perpendicular to the channel 1 and to flow toward the left and right regions 29 and 30 of the upper wall 25. The front wall 23 may be formed of two curved surfaces that intersect to form an intersection line that may be chamfered. In order to achieve the best flow guiding effect, the front wall 23 may be a concave surface formed by concave curved surfaces such as a cylindrical surface, a paraboloid, a surface formed by spline curves, or a concave surface formed by multiple sections of surfaces, or a plane and a convex surface, and fig. 7 to 9 respectively show an embodiment of the front wall 23 formed by two cylindrical concave curved surfaces, two planes, and curved surfaces formed by two spline curves. Utility model people passes through the actual test, and preferred antetheca 23 is the curved surface that face of cylinder, paraboloid and spline curve formed. When the curved surface is designed, the flow guiding effect can be realized when the included angle theta formed by the intersection of the two curved surfaces of the front wall 23 is within 0-360 degrees, the flow direction of the molten glass on the molten glass guiding device 2 can be quickly adjusted under the flow guiding effect of the external shape of the front wall 23 when the included angle theta is preferably within 0-180 degrees, and the most preferable range of the included angle theta is 5-90 degrees through experimental tests, so that the flow guiding effect is optimal.
In the design of the front wall 23, the two curved surfaces are preferably designed to be symmetrical with the intersecting line, so that the glass liquid flows on the two sides have symmetry, and the flow guiding effect is exerted to the maximum extent. The two curved surfaces can also be asymmetric with the intersection line, and the flow guiding effect is improved by controlling the flow of the glass liquid. The sides of the front wall 23 are generally planar and may also extend in a curved shape of the front wall 23, as shown in fig. 7-9, to match the curved shape of the front wall 23.
In order to keep the streamline structure of the molten glass guiding device 2, the intersection of the front wall 23, the rear wall 24, the upper wall 25, the front side wall 26 and the bottom wall 27 can be chamfered or filleted when immersed in molten glass, so that the flow resistance of the molten glass near the intersection is reduced, and the influence on the quality of the molten glass caused by the falling of a body material at the corner due to the scouring of the molten glass in the long-term use of the molten glass guiding device 2 is reduced. Such a chamfer is generally controlled to within 0-100mm of radius, depending on the local thickness of the molten glass guiding device 2.
The bottom wall 27 is designed so that the elevation of the wall surface near the glass inlet side and the elevation of the wall surface near the glass outlet side can be arbitrarily adjusted, and preferably, the elevation of the wall surface near the glass inlet side is lower than the elevation of the wall surface near the glass outlet side, so that the inlet cross section of the molten glass lower than the bottom wall 27 in the channel is smaller than the outlet cross section when the molten glass flows through the channel, thereby preventing the bottom wall 27 from forming bubbles when the bottom wall 27 is in long-term contact with the molten glass, and.
When the distance between the upper wall 25 and the bottom wall 27 is designed, the stress and deformation of the molten glass guiding device 2 are calculated according to the selected parameters such as material density, elastic modulus, Poisson's ratio and the like, and the deformation of the molten glass guiding device 2 in the vertical direction is controlled to be not more than 3% of the width of the molten glass channel spanned by the molten glass guiding device 2. When refractory material is used as the body of the molten glass guiding device 2 and the molten glass guiding device 2 does not exceed 1200mm across the width of the molten glass channel, it is preferred that the average distance between the upper wall 25 and the bottom wall 27 is 20mm to 300mm, most preferably 35mm to 150 mm. When the width of the channel 1 exceeds 1200mm, the average distance between the upper wall 25 and the bottom wall 27 is adjusted according to the deformation of the molten glass guiding device 2 in the vertical direction.
In order to match the bilateral diversion design of the molten glass diversion device 2, discharge ponds 3 are arranged on two sides of the molten glass diversion device 2, and the discharge ponds 3 are composed of a left discharge pond and a right discharge pond, as shown in fig. 3. The left discharge tank is connected to the left region 29 of the upper wall 25; the right discharge sump is connected to the right side region 30 of the upper wall 25. The drain pool 3 comprises a drain side wall 31, a drain bottom wall 32 and a drain opening, wherein the drain opening can be a drain pipe 33, as shown in fig. 10-11, or an overflow opening 34 can be adopted as the drain opening, and the draining of the molten glass is controlled by arranging an overflow baffle 35, as shown in fig. 12. The overflow 34 may be disposed above or below the overflow weir 35, and the overflow 34 is shown above the overflow weir 35 in fig. 12.
The drain bottom wall 32 may be planar with the upper wall 25, preferably with the drain bottom wall 32 being lower than the upper wall 25.
When a discharge pipe 33 design is employed, the discharge pipe 33 may be disposed on the discharge bottom wall 32 as shown in FIG. 10, and the discharge pipe 33 may also be disposed on the discharge side wall 31 as shown in FIG. 11. The length of the discharge pipe 33 can be designed according to the field space, and the inner diameter of the discharge pipe 33 can be calculated according to the fluid mechanics formula according to parameters such as the liquid level difference in laminar flow, the viscosity of glass, the density, the pipe length, the predicted flow and the like. The discharge pipe 33 may be made of a refractory material or a metal, preferably a metal material, more preferably platinum or an alloy thereof. By providing a heating circuit and a temperature measuring device on the discharge pipe 33 and the overflow 34, the temperature of the molten glass inside the discharge pipe 33 and the overflow 34 can be controlled, thereby controlling the flow rate of the molten glass in the discharge pipe 33 and the flow rate of the molten glass at the overflow 34.
The inlet of the discharge tank is connected to the glass flow guiding device 2, and the glass liquid enters the left discharge tank inlet and the right discharge tank inlet from the left area 29 and the right area 30 of the upper wall 25 respectively.
The utility model discloses an adopt glass liquid water conservancy diversion passageway and glass liquid guiding device 2 that has above structure, can provide following glass liquid quality improvement method, this method includes following step:
1) before the diversion discharge starts, the glass liquid reaches a stable flowing state in the channel 1, and the liquid level line is higher than the upper wall 25;
2) the molten glass contacts with the front wall 23, the rear wall 24, the upper wall 25, the front side wall 26 and the bottom wall 27 of the molten glass guiding device 2 during flowing, wherein the upper wall 25, the front side wall 26 and the bottom wall 27 are all immersed in the molten glass; the molten glass also contacts with the discharge side wall 31, the discharge bottom wall 32 and the discharge port of the discharge reservoir 3 during the flow, wherein the discharge bottom wall 32 and the discharge port are immersed in the molten glass;
3) when diversion drainage is carried out, the discharge pipe 33 or the overflow port 34 of the drainage pool 3 is heated, so that the temperature of the discharge pipe 33 or the overflow port 34 is increased, the viscosity of the molten glass at the discharge pipe 33 or the overflow port 34 is reduced due to temperature increase, the molten glass has fluidity, and the molten glass in the discharge pipe 33 or the overflow port 34 starts to flow under the action of liquid level difference, gravity and the like;
4) after diversion drainage is started, under the action of liquid level difference, discharge amount and discharge flow on two sides, the flow of the glass liquid in the channel is divided into two parts, wherein the liquid level of one part of the glass liquid is higher than that of the upper wall 25 of the glass liquid diversion device 2, the part of the glass liquid enters the central area 28 of the upper wall 25 from the channel 1 and then respectively enters the left area 29 and the right area 30 of the upper wall 25 under the diversion action of the front wall 23, the glass liquid in the left area 29 enters the left drainage tank inlet under the guidance of the left side of the front wall 23, the left diversion angle 18 and the side wall of the left groove 16, and the glass liquid in the right area 30 enters the right drainage tank inlet under the guidance of the right side of the front wall 23, the right diversion angle 19 and the side wall of the right groove 17. The molten glass enters the discharge pool 3 and is guided by the discharge side wall 31 and the discharge bottom wall 32 to be discharged from the discharge pipe 33 or the overflow 34, and the discharge bottom wall 32 is completely immersed in the molten glass in the process; according to the requirement of the discharge flow of the glass on site, the temperature of the discharge pipes 33 or the overflow ports 34 at two sides is controlled, so that the flow of the glass liquid discharged from the discharge pipes 33 or the overflow ports 34 is within the required range;
5) the other part of the glass liquid level in the channel 1 is lower than the upper wall 25 of the glass liquid guiding device 2, and the part of the glass liquid continuously flows through the front side wall 26 and the bottom wall 27 surface of the glass liquid guiding device 2 along the channel 1, passes through the glass liquid guiding device 2 and enters the subsequent production.
By adopting the method for improving the quality of the glass liquid, the flow resistance of the impurity layer on the surface of the glass liquid in the channel is effectively reduced, the glass liquid with the liquid level higher than the upper wall 25 is discharged from the discharge pipes at two sides through the flow control of the discharge pipes, so that the glass liquid with the impurity problem close to the surface layer in the channel is discharged and discharged along with the diversion, the influence of the glass liquid at the surface layer on the subsequent production is effectively prevented, and the glass quality level in the subsequent production link is improved. Meanwhile, the bilateral diversion discharge mode further reduces the local flow resistance of the surface glass liquid on the edge part near the side wall of the channel and shortens the flow path, thereby effectively solving the quality problem of the surface glass liquid near the side wall in the channel.
In the method for improving the quality of the molten glass, the flow rate of the discharge port can be calculated according to the discharge amount of the production line, and the total flow rate of the discharge port is not more than 15% of the discharge amount of the production line, and is preferably within 10%. When the discharge amount is exceeded, the molten glass guiding device 2 can also work normally, only the yield of the production line is obviously reduced, and the production cost is greatly increased.
In order to ensure the fluidity of the molten glass in the molten glass guiding device 2 and the discharge pool, the average temperature difference of the molten glass on the sections of the molten glass guiding device 2 and the front side wall 26 of the molten glass guiding device 2 in the discharge pool and the channel is controlled to be not more than 250 ℃, and the optimal average temperature difference is not more than 100 ℃.
In order to prevent the impurity layer from being formed on the surface layer of the guided molten glass again and influence the quality of the molten glass by adopting the molten glass quality improvement method, the position of the molten glass guiding device 2 on the channel is arranged near the molten glass outlet of the channel as much as possible, and the preferable position is that the distance from the rear wall 24 of the molten glass guiding device 2 to the molten glass outlet of the channel is 0-2500 mm. The distance from the back wall 24 to the channel molten glass outlet is understood herein to mean that there is no conventional process of homogenization, flow control, channel cross-sectional variation, shaping, etc. within this distance.
Further, the utility model discloses still develoied experimental analysis to the glass liquid passageway of fig. 3 to through glass liquid flow field analysis, note 2000 evenly distributed at the particle movement track of the different top layer degree of depth of passageway glass liquid entrance, then the exit position of the different degree of depth particles of statistics obtains like the experimental result shown in table 1. In the experiment process, the flow tracks and the final outlets of the molten glass particles with the depths of 5mm, 15mm, 25mm and 40mm below the surface layer of the molten glass are analyzed under the geometrical conditions that the channel width is 400mm, the molten glass depth is 400mm and the distance between the glass inlet and the front side wall 26 is 1000 mm.
TABLE 1 particle tracing results at different liquid levels and depths
In the statistics of table 1, the total number of particles released at the inlet is greater than the sum of all the particles released at the outlet, which is caused by the fact that part of the particles stay too long near the channel side wall, and the part of the particles can not flow out of the calculation domain statistically during particle tracing. But this phenomenon does not affect the analysis of the results in quantitative proportion. Through the particle tracer experiment can see that the particle of the degree of depth within 25mm all discharges through the water conservancy diversion, and when the tracer particle degree of depth was greater than glass liquid level on the upper wall 25, a large amount of particles all appeared in passageway glass liquid export, and only a few particles discharge through the water conservancy diversion. Experiments prove that the glass liquid diversion device 2 applying the glass liquid channel shown in the figure 3 can lead the glass liquid particles near the surface layer to flow to the discharge pools at two sides along the upper bottom wall of the diversion under the action of the glass liquid diversion device 2 by diverting the flow direction of the glass liquid particles near the surface layer, and finally discharge the tracer particles near the surface layer through the discharge pipes. Therefore, the method for improving the quality of the glass liquid by adopting the glass liquid guiding device 2 of the glass liquid channel of the utility model is effective.
The utility model is particularly suitable for a production line that is provided with free liquid level glass liquid passageway in the glass production process, the quality improvement of specially adapted optical glass, low-expansion borosilicate glass, high aluminium float glass. Furthermore, the utility model is particularly suitable for the improvement of the quality of the molten glass of the production line with the melting amount of 3t/d or above.
Claims (10)
1. The molten glass flow guiding device is characterized by comprising a lower baffle plate (21) and an upper baffle plate (22), wherein the upper baffle plate (22) is arranged on the lower baffle plate (21), the front surface of the upper baffle plate (22) is a front wall (23), the rear surface of the upper baffle plate (22) is a rear wall (24), the top surface of the lower baffle plate (21) is an upper wall (25), the front surface of the lower baffle plate (21) is a front side wall (26), the bottom surface of the lower baffle plate (21) is a bottom wall (27), and the front wall (23) is a curved surface formed by a cylindrical surface, a paraboloid and a spline curve.
2. The molten glass guiding device according to claim 1, wherein the front wall (23) is formed of two curved surfaces, the two curved surfaces intersecting at an angle θ of 5 to 90 °, and the two curved surfaces being symmetrical to the intersection line.
3. The molten glass guiding device according to claim 1, characterized in that the upper wall (25) is divided into three zones, a central zone (28) being located inside the channel (1) adjacent to the front wall (23) and the front side wall (26); the left side area (29) is adjacent to the left diversion angle (18) and is partially embedded into the left side wall (11); the right side region (30) is adjacent to the right diversion angle (19) and is partially embedded in the right side wall (12).
4. The molten glass flow guide channel comprises a channel (1), and is characterized by further comprising a discharge pool (3) and the molten glass flow guide device (2) as defined in claim 1, wherein the left end and the right end of the molten glass flow guide device (2) are respectively embedded into a left side wall (11) and a right side wall (12) on the channel (1), and the molten glass flow guide device (2) is connected with the discharge pool (3).
5. The molten glass guiding channel according to claim 4, wherein the channel (1) comprises a left side wall (11), a right side wall (12), a molten glass inlet (13), a molten glass outlet (14) and a channel bottom wall (15), wherein a left groove (16) and a right groove (17) are respectively formed on the left side wall (11) and the right side wall (12), and a left guiding angle (18) and a right guiding angle (19) are respectively formed on the left groove (16) and the right groove (17).
6. The molten glass guiding channel according to claim 4, wherein the molten glass guiding device (2) is coated with a layer of metal material on the surface, and the thickness of the metal material coating layer is 0.5mm-1.0 mm; the glass liquid guiding device (2) selects the Pipelo with the thermal expansion coefficient of 9.1-6K-1～13.5Х10-6K-1Is made of the refractory material.
7. The molten glass delivery channel of claim 6, wherein the metallic material coating is made of pure platinum metal, platinum rhodium alloy, or platinum gold alloy.
8. The molten glass guiding channel according to claim 4, wherein a left discharge well and a right discharge well are provided on both sides of the molten glass guiding device (2), respectively, and the left discharge well is connected to a left region (29) of the upper wall (25); the right discharge tank is connected to the right region (30) of the upper wall (25).
9. The molten glass guiding channel according to claim 4, wherein the drain pool (3) comprises a drain side wall (31), a drain bottom wall (32) and a drain opening, the drain opening being a drain pipe (33) or an overflow (34), the drain pipe (33) being provided on the drain bottom wall (32) or the drain side wall (31).
10. The molten glass channel according to claim 4, wherein the molten glass deflector (2) is vertically deformed by no more than 3% of the width of the molten glass channel across which the molten glass deflector (2) is positioned.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110818226A (en) * | 2019-12-20 | 2020-02-21 | 成都光明光电股份有限公司 | Molten glass flow guiding device, molten glass flow guiding channel and molten glass quality improvement method |
| CN115215533A (en) * | 2022-07-26 | 2022-10-21 | 凯盛君恒药玻(青岛)有限公司 | Glass melting furnace with overflow device |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110818226A (en) * | 2019-12-20 | 2020-02-21 | 成都光明光电股份有限公司 | Molten glass flow guiding device, molten glass flow guiding channel and molten glass quality improvement method |
| CN115215533A (en) * | 2022-07-26 | 2022-10-21 | 凯盛君恒药玻(青岛)有限公司 | Glass melting furnace with overflow device |
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