JP6435827B2 - Temperature control method for molten glass - Google Patents

Description

The present invention relates to temperature controlling method of melting glass.

  Conventionally, for example, as shown in Patent Document 1, a manufacturing apparatus for manufacturing a glass article is configured to melt a glass raw material in a melting furnace and supply the obtained molten glass to a forming unit through a feeder (supply passage). ing. From the viewpoint of ensuring heat resistance and oxidation resistance, the feeder includes a molten glass flow passage made of platinum or a platinum alloy through which the molten glass is circulated, and a plurality of refractories (for example, around the molten glass flow passage) A heat insulating part made of brick) is constructed and constructed. By this heat insulating part, the molten glass flowing through the molten glass flow path made of platinum or platinum alloy is gradually cooled (abrupt cooling is prevented), and the molded part is heated to a temperature suitable for molding the molten glass. It comes to be supplied.

JP 2014-19629 A

  By the way, in the apparatus for manufacturing a glass article as described above, the degree of decrease in the temperature of the molten glass in the feeder varies depending on the flow rate of the molten glass flowing in the flow passage of the feeder. In order to set the temperature to an appropriate temperature according to the glass forming method in the forming portion, it is necessary to adjust the temperature of the molten glass at the feeder portion. When the flow rate of the molten glass is small and the temperature is likely to be lower than desired, the temperature of the molten glass supplied to the forming part is set to an appropriate temperature by causing a current to flow through the molten glass flow passage to generate heat. be able to. However, it cannot cope with the case where the flow rate of the molten glass in the flow passage is large and the temperature is less likely to decrease than desired, and there is still room for improvement in this respect.

The present invention was made to solve the above problems, it provides a temperature control method of melting glass which enables the downregulation of the temperature of the molten glass flowing in the feeder with a simple configuration There is to do.

  An apparatus for manufacturing a glass article that solves the above problems is a glass including a feeder in which a heat insulating portion made of a plurality of refractories is disposed around a molten glass flow path made of platinum or a platinum alloy through which molten glass is circulated. In the article manufacturing apparatus, the heat insulating portion is provided with an unconnected portion to which a part of the refractory can be attached and detached.

  According to this configuration, the refractory in the unconnected portion of the heat insulating portion is configured to be detachable, and by removing the refractory in the non-connected portion, heat dissipation from the molten glass flow passage is promoted, and as a result, the flow passage A decrease in the temperature of the molten glass inside can be promoted. As described above, the temperature of the molten glass flowing in the feeder can be adjusted downward with a simple configuration in which a part of the refractory constituting the heat insulating portion can be attached and detached.

In the glass article manufacturing apparatus, it is preferable that the unconnected portion of the heat insulating portion is provided at least above the molten glass flow path.
According to this configuration, it is possible to easily configure an unconnected portion in which the refractory can be attached and detached simply by stacking without joining the refractory using the joint agent at a position above the molten glass flow passage.

  A method for controlling the temperature of molten glass that solves the above-mentioned problem is to adjust the temperature of molten glass flowing in a molten glass flow passage made of platinum or a platinum alloy surrounded by a heat insulating portion composed of a plurality of refractories. A method of controlling a temperature of molten glass, wherein the heat insulating portion is provided with a non-connected portion to which a part of the refractory can be attached and detached, and the melting is performed by attaching and detaching the refractory to the non-connected portion of the heat insulating portion The temperature of the molten glass flowing through the glass flow path is adjusted.

  According to this method, by removing the refractory from the unconnected portion of the heat insulating portion, heat dissipation from the molten glass flow passage can be promoted, and as a result, a decrease in the temperature of the molten glass in the flow passage can be promoted. As described above, the temperature of the molten glass flowing in the feeder can be adjusted downward with a simple configuration in which a part of the refractory constituting the heat insulating portion can be attached and detached.

  In the temperature control method of the molten glass, it is preferable to reduce the temperature of the molten glass flowing through the molten glass flow path by supplying a liquid or gas between the refractories in the unconnected portion.

  According to this method, the fall of the temperature of the molten glass in a flow path can be promoted further.

According to temperature control method of melting glass of the present invention, down-regulation of the temperature of the molten glass flowing in the feeder can be performed with a simple configuration.

(A) is a schematic diagram which shows schematic structure of the plate glass manufacturing apparatus of embodiment, (b) is a schematic diagram which shows the state which removed the brick of the non-connecting part in the feeder. (A) is a schematic cross section of the feeder of the same form, (b) is a schematic cross section which shows the state which removed the brick of the non-connecting part in the feeder. It is a schematic cross section of the feeder of another example.

Hereinafter, an embodiment of a plate glass manufacturing apparatus (glass article manufacturing apparatus) and a temperature control method for molten glass will be described.
As shown to Fig.1 (a), the plate glass manufacturing apparatus of this embodiment is an installation using the manufacturing method of the plate glass by a roll-out method, and the molten glass G1 fuse | melted in the melting furnace 11 is the clarification chamber 12. And it is comprised through the feeder 13 so that it may be supplied to the shaping | molding part 14 which consists of a pair of shaping | molding roll 14a. Bubbles in the molten glass G1 are removed in the clarification chamber 12, and the molten glass G1 in the clarification chamber 12 flows into the feeder 13.

  The feeder 13 includes a molten glass flow passage 20 formed of platinum or a platinum alloy, and a heat insulating portion 30 formed of a plurality of bricks 31 (refractory materials) covering the periphery of the molten glass flow passage 20. .

  The molten glass flow passage 20 includes a stirring tank 22 communicated with an inlet 21 into which molten glass G1 from the clarification chamber 12 is introduced, and a pot 24 communicated with the stirring tank 22 via a pipe portion 23. ing. The stirring tank 22 is formed in a substantially cylindrical shape, and a stirring blade 25 for stirring the molten glass G1 is accommodated therein. The pipe portion 23 extends obliquely upward from the outer peripheral surface of the lower end portion of the stirring tank 22 and is connected to the outer peripheral surface slightly higher than the center portion of the pot 24. In the present embodiment, the pipe portion 23 is formed in a circular cross section (see FIG. 2A).

  The pot 24 is a volume part for mainly performing viscosity adjustment and flow rate adjustment of the molten glass G1, and is formed in a substantially cylindrical shape that tapers in the vicinity of the discharge port 24a at the lower end. Molten glass G <b> 1 that has flowed into the pot 24 from the pipe portion 23 is discharged from the discharge port 24 a and supplied to the lower forming portion 14.

  In the forming unit 14, the molten glass G1 supplied from the discharge port 24a of the pot 24 is rolled between a pair of forming rolls 14a and formed into a sheet glass G2 (glass ribbon). It is conveyed to the process.

[Feeder Details]
In said feeder 13, the heat insulation part 30 which arrange | positions the some brick 31 which makes | forms a rectangular parallelepiped shape is comprised so that parts other than the inflow port 21 and the discharge port 24a of the molten glass flow path 20 may be covered. That is, the heat insulating portion 30 (the plurality of bricks 31) substantially covers the six directions of the molten glass flow passage 20 in the vertical direction, the front-rear direction (the left-right direction in FIG. 1), and the width direction (the direction orthogonal to the plane of FIG. 1). In addition, the discharge port 24a of the pot 24 is exposed from the bottom surface of the heat insulating portion 30, and a portion other than the discharge port 24a on the bottom surface of the heat insulating portion 30 is covered with a metal cover 30a.

  Here, the heat insulating portion 30 includes a connecting portion 33 in which adjacent bricks 31 are joined with a mortar 32 (fireproof mortar) as a joint agent, and a non-connecting portion 34 on which the brick 31 is placed without using the joint agent. It has. In addition, in FIG. 1 (a) and FIG. 2 (a), the clearance gap between each brick 31 in the non-connecting part 34 is exaggerated and illustrated.

  The non-connecting portion 34 of the heat insulating portion 30 is set only above the pipe portion 23, and a portion other than the non-connecting portion 34 in the heat insulating portion 30 is configured as a connecting portion 33. Moreover, the molten glass flow path 20 is arrange | positioned inside the connection part 33 of the heat insulation part 30, and between the molten glass flow path 20 and the brick 31 (connection part 33) facing, it is a caster 35 (castable refractory) ) Is filled. That is, the outer peripheral surface of the molten glass flow passage 20 is covered with the casters 35, and the bricks 31 are arranged outside the casters 35.

  Above the pipe portion 23 of the molten glass flow path 20, the heat insulating portion 30 is configured as a connecting portion 33 only in the first layer contacting the caster 35 covering the pipe portion 23 (that is, only the first layer is joined by the mortar 32), The first layer connecting portion 33 (the connecting portion 33a in FIGS. 1A and 1B) has a stepped shape along the inclined shape of the pipe portion 23 from the stirring tank 22 to the pot 24. A plurality of bricks 31 that are not bonded and fixed to each other are stacked on the upper side of the first-layer connection portion 33a, and a non-connection portion 34 is configured from the bricks 31 that are not bonded to each other. Note that the bricks 31 in the unconnected portion 34 are stacked such that the number of layers (stacked number) decreases toward the pot 24. That is, the non-connected portion 34 has a larger number of bricks 31 toward the stirring tank 22 (that is, the depth of the non-connected portion 34 is deeper).

Next, a method for controlling the temperature of molten glass and its operation in the sheet glass manufacturing apparatus of this embodiment will be described.
The molten glass G1 melted in the melting furnace 11 is supplied to the inlet 21 of the feeder 13 (molten glass flow path 20) through the clarification chamber 12. The temperature of the molten glass G1 at the time of flowing into the inlet 21 is approximately 1550 to 1750 ° C. Thereafter, the molten glass G <b> 1 flows into the pot 24 through the pipe portion 23 while being stirred by the stirring blade 25 of the stirring tank 22, and is supplied from the discharge port 24 a of the pot 24 to the molding portion 14. And the molten glass G1 is rolled between the pair of forming rolls 14a of the forming unit 14 and formed into a sheet glass G2 (roll-out forming). Since the temperature (appropriate temperature) suitable for forming the sheet glass G2 by this roll-out molding is approximately 1400 ° C. to 1500 ° C., the molten glass G1 passes through the molten glass flow path 20 from the inlet 21 to the outlet 24a. While the temperature of the molten glass G1 needs to be gradually cooled by about 50 ° C. to 350 ° C. during the flow, the degree of gradual cooling in the molten glass flow path 20 varies depending on the flow rate of the molten glass G1.

  Here, for example, when the measurement result of a temperature sensor (not shown) that measures the temperature (temperature during molding) of the molten glass G1 when supplied to the molding unit 14 is lower than the appropriate temperature, platinum or a platinum alloy An electric current is passed through the molten glass flow path 20 made to heat the flow path 20. As a result, the molten glass flow passage 20 flowing in the molten glass flow passage 20 is heated, and as a result, the temperature at the time of molding the molten glass G1 can be adjusted to an appropriate temperature (upward adjustment).

  On the other hand, when the measurement result of the temperature sensor that measures the molding temperature of the molten glass G1 is higher than the appropriate temperature, the brick 31 of the unconnected portion 34 provided above the pipe portion 23 in the heat insulating portion 30. Remove some or all. In addition, in FIG.1 (b) and FIG.2 (b), the state which removed all the bricks 31 of the non-connecting part 34 is illustrated as an example. And the layer (thickness) of the heat insulation part 30 above the pipe part 23 becomes thin by removing a part or all of the brick 31 of the non-connection part 34, and heat dissipation from the thinned part is promoted. Thereby, especially the fall of the temperature of the molten glass flow path 20 which flows through the pipe part 23 is accelerated | stimulated, As a result, it becomes possible to adjust the temperature at the time of shaping | molding of the molten glass G1 to appropriate temperature (downward adjustment). In this temperature control method, the amount of temperature adjustment can be changed depending on the number of bricks 31 to be removed and which brick 31 of the unconnected portion 34 is to be removed, and as shown in FIG. When the brick 31 is removed, the amount of heat released from the pipe part 23, the agitation tank 22 and the pot 24 is maximized, and an effective reduction in molding temperature is expected.

Next, characteristic effects of the present embodiment will be described.
(1) The heat insulating portion 30 of the feeder 13 includes a connecting portion 33 in which a plurality of bricks 31 are joined to each other by a mortar 32, and a non-connecting portion 34 that is not joined and fixed to each other so that the brick 31 can be attached and detached. Is provided. Then, by removing a part or all of the brick 31 of the unconnected portion 34, heat dissipation from the molten glass flow path 20 is promoted, and as a result, a decrease in the temperature of the molten glass G1 in the flow path 20 is promoted. Can do. In this way, the temperature of the molten glass G1 flowing in the feeder 13 can be adjusted downward with a simple configuration in which a part of the brick 31 constituting the heat insulating portion 30 is simply stacked without being joined with a joint agent such as mortar. Become. In particular, since the temperature of the molten glass G1 is high in the crystallized glass and it is difficult to adjust the temperature of the molten glass G1 downward, it is preferable to use this temperature control method.

  (2) The unconnected portion 34 of the heat insulating portion 30 is provided at a position above the molten glass flow passage 20 (pipe portion 23). According to this configuration, the unconnected portion 34 to which the brick 31 can be attached / detached can be easily configured simply by stacking the brick 31 without using a joint agent at a position above the molten glass flow passage 20 (pipe portion 23). Can do.

In addition, you may change the said embodiment as follows.
-Although the feeder 13 of the said embodiment has a structure provided with one stirring tank 22, it is good also as a structure provided with two or more stirring tanks. In this case, it is only necessary to provide a pipe part that connects the respective stirring tanks. Specifically, for example, the pipe is extended obliquely upward from the outer peripheral surface of the lower end part of the upstream stirring tank, and the upper end of the downstream stirring tank is provided. What is necessary is just to connect with the outer peripheral surface of a part vicinity.

  In the above embodiment, the unconnected portion 34 of the heat insulating portion 30 is set only above the pipe portion 23, but is not particularly limited thereto, and the setting position of the unconnected portion 34 is appropriately changed according to the configuration. For example, in the case of a feeder structure provided with a plurality of portions upstream of the agitation tank 22 or a plurality of each agitation tank, it may be set above the pipe portion between the agitation tanks.

  Further, for example, as shown in FIG. 3, in the entire periphery of the pipe portion 23, only the first layer of the heat insulating portion 30 (brick 31) in contact with the caster 35 is used as a connecting portion 33 a (that is, bonded to each other with a mortar 32). You may comprise the upper part of the connection part 33a, the lower side, and the width direction both sides part as the non-connection part 34. FIG. In this configuration, for example, when the brick 31 above the connection portion 33a is removed and the molten glass G1 has a molding temperature (measurement result of the temperature sensor) higher than the appropriate temperature, the width direction of the connection portion 33a. It becomes possible to supply water, water vapor, or cooling air to the gaps between the bricks 31 (non-connected portions 34) on both sides and the lower side. And by supplying water, water vapor | steam, or cooling air to the non-connection part 34 around the pipe part 23 (around the connection part 33a) like that, the fall of the temperature of the molten glass G1 in the molten glass flow path 20 is made more. It can be further encouraged.

In the above embodiment, the heat insulating portion 30 (the connecting portion 33 and the non-connecting portion 34) may be made of a refractory other than the brick 31.
-Although the plate glass manufacturing apparatus of the said embodiment has a structure provided with one feeder 13, it is good also as a structure provided with two or more feeders.

  -The manufacturing method of the plate glass G2 in the shaping | molding part 14 is not limited to a roll-out shaping | molding method, For example, it is good also as down-draw shaping methods, such as an overflow down draw method and a slot down draw method, a float shaping method.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
Wherein the unbound portion of the adiabatic section manufacturing apparatus features and be Ruga Las article that is provided to surround the tube around the molten glass flow path.

  According to this configuration, for example, when a part of the non-connected portion of the heat insulating portion (for example, the refractory above the molten glass flow passage) is removed, the molten glass is still disconnected when the temperature during molding is higher than the appropriate temperature. It becomes possible to supply the liquid or gas for cooling to the clearance gap between the remaining refractories (for example, the refractory below the molten glass flow path) of a part. And the fall of the temperature of the molten glass in a molten glass flow path can be further accelerated | stimulated by supplying the liquid or gas for cooling to the non-connection part around a molten glass flow path.

  DESCRIPTION OF SYMBOLS 13 ... Feeder, 20 ... Molten glass flow path, 30 ... Heat insulation part, 31 ... Brick (refractory), 32 ... Mortar (joint agent), 33 (33a) ... Connection part, 34 ... Non-connection part, G1 ... Molten glass .

Claims (2)

A temperature control method for molten glass that adjusts the temperature of molten glass flowing in a molten glass flow passage made of platinum or a platinum alloy surrounded by a heat insulating portion composed of a plurality of refractories,
The heat insulating portion is provided with a non-connecting portion to which a part of the refractory can be attached and detached,
A temperature control method for molten glass, wherein the temperature of the molten glass flowing through the molten glass flow path is adjusted by attaching and detaching the refractory in the non-connected portion of the heat insulating portion. By supplying liquid or gas between the refractory in the unconsolidated portion, temperature control of the molten glass according to claim 1, characterized in that lowering the temperature of the molten glass flowing in the molten glass flow path Method.