CN115636571A - Temperature control method for float glass melting furnace - Google Patents
Temperature control method for float glass melting furnace Download PDFInfo
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- CN115636571A CN115636571A CN202211421848.2A CN202211421848A CN115636571A CN 115636571 A CN115636571 A CN 115636571A CN 202211421848 A CN202211421848 A CN 202211421848A CN 115636571 A CN115636571 A CN 115636571A
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- 238000002844 melting Methods 0.000 title claims abstract description 228
- 230000008018 melting Effects 0.000 title claims abstract description 228
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000005329 float glass Substances 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 258
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 239000006060 molten glass Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims description 8
- 239000002826 coolant Substances 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 abstract description 18
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000000498 cooling water Substances 0.000 description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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Abstract
The invention provides a temperature control method of a float glass melting furnace, which comprises the following steps: a melting furnace temperature obtaining step: acquiring the temperature of a melting furnace; and a water bag feeding and discharging step: the obtained melting furnace temperature is compared with a set first melting furnace temperature, and the water bag for cooling the melting furnace is moved forward or backward in the melting furnace according to the height relation between the obtained melting furnace temperature and the set first melting furnace temperature. According to the temperature control method of the float glass melting furnace of the invention, the temperature in the melting furnace can be accurately controlled, thereby cooling the molten glass uniformly, increasing the uniformity of the glass thickness and reducing the bubble rate in the glass.
Description
Technical Field
The invention relates to a temperature control method of a float glass melting furnace.
Background
Float glass is widely used because of its uniform thickness (good flatness) and high transparency. The process for producing float glass generally comprises: the float glass product is prepared by putting glass raw materials into a melting furnace, melting the glass raw materials at high temperature, then enabling the molten glass to flow into a tin bath from the melting furnace and float on the surface of molten tin with large relative density in the tin bath, and further carrying out flattening, hardening, cooling, annealing and cutting. Since the float glass is formed at a temperature of about 1100 ℃ in a tin bath, it is necessary to lower the temperature of the molten glass from a high temperature (for example, about 1350 ℃) to about 1100 ℃ before flowing the molten glass from the melting furnace into the tin bath.
In a conventional float glass production process, in order to cool molten glass to an appropriate temperature, a fan is generally provided outside a glass melting furnace, and the fan is operated to blow air into the furnace to cool the molten glass.
Disclosure of Invention
The cooling method described above is simple and easy to maintain, but has a problem that the amount of air blown into the melting furnace by the fan and the temperature of the air cannot be accurately controlled. Further, since the temperature difference between the wind and the molten glass is too large, the surface of the molten glass is rapidly cooled during cooling, and the entire molten glass is unevenly cooled, thereby causing a problem that the uniformity of the glass thickness is lowered and the bubble rate in the glass is increased.
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a temperature control method for a float glass melting furnace, which can accurately control the temperature in the melting furnace, thereby making cooling of molten glass uniform, increasing the uniformity of glass thickness, and decreasing the bubble rate in glass.
The invention provides a temperature control method of a float glass melting furnace, which comprises the following steps: a melting furnace temperature obtaining step: acquiring the temperature of a melting furnace; and a water bag feeding and discharging step: the obtained melting furnace temperature is compared with a set first melting furnace temperature, and the water bag for cooling the melting furnace is moved forward or backward in the melting furnace according to the height relation between the obtained melting furnace temperature and the set first melting furnace temperature.
In one embodiment of the temperature control method, the step of moving the water drum forward and backward further comprises: a water drum advancing and retreating distance obtaining step: and acquiring the distance for moving the water bag forwards or backwards in the melting furnace in order to enable the melting furnace temperature to reach the first temperature according to each melting furnace temperature.
In one embodiment of the temperature control method, before the step of acquiring the advance and retreat distance of the water drum, a step of acquiring the current position of the water drum in the melting furnace is further provided; in the water-bag advancing/retreating step, the water bag is advanced by the distance from the current position when the melting furnace temperature is higher than the first temperature, and the water bag is retreated by the distance from the current position when the melting furnace temperature is lower than the first temperature.
In one embodiment of the temperature control method, the water pack advancing/retreating distance acquiring step performs a proportional integral derivative calculation based on a difference between the melting furnace temperature and the first temperature to obtain a distance that the water pack needs to advance or retreat in the melting furnace in order to make the melting furnace temperature reach the first temperature.
In one embodiment of the temperature control method, the water drum advancing/retreating distance acquiring step obtains, by experiment, a distance by which the water drum needs to be advanced or retreated in the melting furnace in accordance with the shape, size, and temperature of the melting furnace, depending on the shape and size of the water drum, the type of the cooling medium, and the material from which the water drum is made.
In one embodiment of the temperature control method, a database is formed by correlating the current position of the water drum, the temperature of each melting furnace and the obtained advance and retreat distances of the water drum corresponding to the temperatures of each melting furnace in advance; in the water drum advancing and retreating step, the water drum advancing and retreating distance corresponding to the current position of the water drum and the obtained temperature of the melting furnace is searched from the database, and the water drum is made to advance or retreat within the melting furnace from the current position by the distance.
In one embodiment of the temperature control method, the current position of the water drum is obtained by a position sensor provided on the water drum, or by calculating a moving distance of the water drum, or by photographing with a camera provided in the melting furnace.
In one embodiment of the temperature control method, the melting furnace temperature is a temperature of a molten glass flow path of the melting furnace.
In one mode of the temperature control method, the water drum is a pipe which is bent into a U shape integrally from a pipe, the closed end of the U shape faces the melting furnace, and the two open ends of the U shape are respectively provided with a water inlet and a water outlet.
In one embodiment of the temperature control method, the water drum is driven to advance or retreat in the melting furnace by a water drum moving system, and the water drum moving system includes: a motor for driving the water drum to move forward or backward in the melting furnace; a beam fixed outside the melting furnace; and the suspension part can move along the cross beam under the driving of the motor, the rear end where the U-shaped opening of the water drum is positioned is fixed and suspended on the suspension part, the motor of the water drum moving system is connected with a control part in a wired or wireless mode, and the control part controls the water drum to enter and exit the melting furnace through the motor.
Technical effects
According to the temperature control method of the float glass melting furnace of the invention, the temperature in the melting furnace can be accurately controlled, so that the cooling of the molten glass is uniform, the uniformity of the glass thickness is improved, and the bubble rate in the glass is reduced.
Drawings
FIG. 1 is a schematic representation of a water bag prior to entry into a float glass furnace.
FIG. 2 is a schematic view of the water bag after entering the float glass furnace.
FIG. 3 is a perspective view of the water-bag cooling device as viewed from one side of the water bag.
Fig. 4 is a perspective view of the water pack when the water pack is viewed obliquely from above.
FIG. 5 is a cross-sectional view of a water-in-water cooling device.
Fig. 6 is a photograph showing an actual product of the water-in-water cooling apparatus shown in fig. 3 and 5.
FIG. 7 is a flowchart showing temperature control in the float glass melting furnace according to embodiment 1.
FIG. 8 is a flowchart showing temperature control in a float glass melting furnace according to embodiment 2.
Detailed Description
Preferred embodiments for carrying out the present invention will be described below. However, the following embodiments are merely examples, and the present invention is not limited to the following embodiments.
The invention provides a temperature control method of a float glass melting furnace, which particularly utilizes a water-bag cooling device to adjust the temperature in the float glass melting furnace, and accurately controls the temperature in the melting furnace by controlling the forward or backward distance of a water bag in the water-bag cooling device in the melting furnace.
Referring to fig. 1 to 5, a water-in-water cooling apparatus capable of cooling a float glass melting furnace 2 (hereinafter, sometimes simply referred to as a melting furnace 2) includes: a water bag 1 connectable to an external water source; a water drum moving system 3 for moving the water drum forward or backward in the melting furnace 2; and a control unit 4 for controlling the water bag moving system 3. The water bag moving system 3 includes: a motor 31 for driving the water drum 1 to move the water drum 1 forward or backward in the melting furnace 2; a beam 32 fixed outside the melting furnace 2; and a hanging part 33 capable of moving along the beam 32 under the driving of the motor 31, wherein the water bag is fixed with the connection end of the external water source and is hung on the hanging part 33.
FIG. 1 is a schematic view of a water bag before it enters a melting furnace. FIG. 2 is a schematic view of the water drum after entering the melting furnace.
In fig. 1 and 2, the water drum 1 is connected to an external water source (not shown), and cooling water from the external water source flows into the water drum 1 by a water pump (not shown) to cool the melting furnace 2. The cooling water from the external water source may be circulating cooling water or disposable cooling water.
The water drum moving system 3 is capable of moving the water drum 1 in a predetermined direction (in the present embodiment, the left-right direction) under the control of the control unit 4, and thus, the water drum 1 can freely move in and out of the melting furnace 2. A specific configuration of the water movement system 3 will be described later with reference to fig. 3 to 5.
FIG. 3 is a perspective view of the water-bag cooling device as viewed from one side of the water bag. FIG. 4 is a perspective view of the water container when the water container connected to the water pipe is viewed from obliquely above the water container. Fig. 5 is a sectional view of the water drum cooling device, which is a sectional view in a direction perpendicular to the ground and parallel to the moving direction of the water drum.
Here, fig. 3 shows a state where the water bag 1 is moved a certain distance into the melting furnace 2. FIG. 5 shows a state where the water pack 1 is positioned outside the melting furnace 2. As shown in FIG. 5, the wall 2a of the melting furnace 2 is provided with an opening 2b, and the water bag 1 can enter and exit the melting furnace 2 through the opening 2 b.
As shown in fig. 4, the water bag 1 is a U-shaped pipe as a whole. The water pack 1 includes: a first cross tube 1a; a transfer tube 1b connected with the first horizontal tube; a second horizontal tube 1c connected with the transfer tube; a first vertical pipe 1d connected with the first horizontal pipe 1a; a third horizontal tube 1f connected to the first vertical tube 1d; a second vertical pipe 1e connected to the second horizontal pipe; and a fourth horizontal tube 1g connected to the second vertical tube 1 e. The water drum 1 formed by the first horizontal pipe 1a, the adapter pipe 1b, the second horizontal pipe 1c, the first vertical pipe 1d, the third horizontal pipe 1f, the second vertical pipe 1e and the fourth horizontal pipe 1g is U-shaped. By forming the entire water drum 1 in a U-shape, the cooling area of the water drum 1 can be increased.
The water drum 1 does not necessarily comprise a first vertical pipe 1d, a third horizontal pipe 1f, a second vertical pipe 1e and a fourth horizontal pipe 1g, and may comprise only a first horizontal pipe 1a, an adapter pipe 1b and a second horizontal pipe 1c. The water drum formed by the first horizontal pipe 1a, the adapter pipe 1b and the second horizontal pipe 1c is also a U-shaped pipe.
The closed end of the U-shaped pipe is formed by an adapter pipe 1b, and the adapter pipe 1b can be a bent pipe or a straight pipe.
The length of the water bag 1 is preferably within a range of 8000mm to 14000 mm. Here, the length of the water bag 1 means the length of the water bag 1 in the direction in which the pipe extends. In this embodiment, the lengths of the first horizontal tube 1a and the second horizontal tube 1c are 3790mm, the length of the adapter tube 1b is 320mm, the lengths of the first vertical tube 1d and the second vertical tube 1e are 870mm, the lengths of the third horizontal tube 1f and the fourth horizontal tube 1g are 1310mm, and the total length of the water bag 1 is 12260mm, which is the total length of the tubes obtained by adding the lengths of these tubes. However, the length of the water pack 1 is not limited to this, and may be appropriately adjusted according to the volume of the melting furnace 2, the size of the opening 2b of the melting furnace 2, the power of the motor 31, and the like.
The diameter of the water drum 1 is preferably in the range of 50mm to 150mm, and in the present embodiment 100mm. The water bag is made of a material which can resist high temperature in the melting furnace and has good heat transfer performance. In the present embodiment, the forming material of the water pocket is mainly iron.
Referring to fig. 3 and 5, cooling water from an external water source, such as a tap water pipe, flows through a flexible pipe (not shown), the water pipe 41, and the water pack 1. Wherein the flexible pipe is received in the pipe receiving part 42, and includes a flexible inlet pipe and a flexible outlet pipe. The water pipe 41 is formed of the same material as the water bag 1, and includes an inlet pipe 41a and an outlet pipe 41b.
In fig. 4, the water inlet pipe 41a is a vertical pipe and is communicated with the third transverse pipe 1f; the water outlet pipe 41b is a vertical pipe and is communicated with the fourth horizontal pipe 1g. That is, the cooling water from the external water source flows through the flexible inlet pipe → the inlet pipe 41a → the third horizontal pipe 1f → the first vertical pipe 1d → the first horizontal pipe 1a → the junction pipe 1b → the second horizontal pipe 1c → the second vertical pipe 1e → the fourth horizontal pipe 1g → the outlet pipe 41b → the flexible outlet pipe in this order.
Under the condition that the water drum 1 does not comprise a first vertical pipe 1d, a third transverse pipe 1f, a second vertical pipe 1e and a fourth transverse pipe 1g and only comprises a first transverse pipe 1a, an adapter pipe 1b and a second transverse pipe 1c, the water inlet pipe 41a is communicated with the first transverse pipe 1a, and the water outlet pipe 41b is communicated with the second transverse pipe 1c.
As shown in fig. 3 and 5, a cross member 32 extending in the moving direction of the water bag 1 (the direction of moving forward and backward in the melting furnace 2) is provided outside the melting furnace 2. The cross beam 32 is supported on both sides. The support may be a wall (e.g., left support 37 in fig. 3) or a metal frame (e.g., right bracket 38 in fig. 5), and is not particularly limited as long as it can support the cross beam 32.
The cross beam 32 is provided with a groove rail extending in the moving direction of the water drum 1. A hanging portion 33 for fixing and hanging the water bag 1 is provided below the cross member 32. The hanging portion 33 is provided with rollers 34. The rollers 34 are embedded in the groove tracks and can roll along the groove tracks on the cross beam 32, thereby moving the hanging part 33. The rear ends of the water bag 1 (the third horizontal tube 1f and the fourth horizontal tube 1 g) are fixed and suspended by the suspending portions 33. The motor 31 for driving the water drum 1 is fixed to the hanging portion 33, and the hanging portion 33 can be driven to move the hanging portion 33 and the water drum 1 fixed by the hanging portion 33 along the cross beam 32.
In fig. 3 and 5, the support portion 35 for supporting the water drum 1 is provided closer to the melting furnace 2 than the hanging portion 33. The support portion 35 includes a roller 351 rotatable about a central axis at an upper portion thereof, and the roller 351 is in contact with the water drum 1, and specifically, a closed end section of the U shape of the water drum 1 (the first horizontal pipe 1a, the adapter pipe 1b, and the second horizontal pipe 1 c) is bridged on the roller 351. The drum 351 is rotatable by the frictional force of the water pack 1 while the water pack 1 moves back and forth with respect to the melting furnace 2. The drum 351 not only has a function of guiding the movement of the water drum 1, but also has a function of reducing the resistance of the supporting portion 35 to the water drum 1.
In the present embodiment, since the water bag 1 linearly moves along the cross member 32, the position of the water bag 1 can be calculated from the distance the water bag 1 enters the melting furnace 2. On the contrary, the distance of the water bag 1 entering the melting furnace 2 can be calculated according to the position of the water bag 1. Therefore, in the present embodiment, the position of the water bag 1 can be represented by the distance x.
The melting furnace 2 is the same as that in the conventional float glass production process, and a detailed description thereof will be omitted in this specification.
The control unit 4 is connected to the water bag moving system 3 by wire or wireless, and includes a processor for executing a predetermined application program, a memory for storing data, and a display having a display screen. The predetermined application is, for example, an application for controlling the temperature of the melting furnace.
The display of the control unit 4 can display the temperature of the melting furnace, a desired value of the temperature of the melting furnace (corresponding to the first temperature in the summary of the invention), a selection button of a manual control method or an automatic control method of the temperature of the melting furnace, a button for advancing/retracting the water drum, a maximum value or a minimum value of a movement range of the water drum, and the like on the display screen of the application program. The user can input a control command through a display screen of an application on the display to control the water bag moving system 3, and move the water bag 1 in a predetermined direction through the water bag moving system 3.
Fig. 6 is a photograph showing an actual product of the water-in-water cooling apparatus shown in fig. 3 and 5.
The water bag 1 shown in FIGS. 3 to 6 is merely an example, and the shape and structure thereof are not particularly limited as long as the water bag can be moved into and out of the melting furnace 2 to cool the melting furnace 2 to a desired temperature (for example, 1100 ℃ C.). The forward and backward movement of the water drum 1 is not limited to a straight line, and may be a curved line.
There are various embodiments for precisely controlling the temperature in a float glass melting furnace using the above-described water-in-water cooling apparatus, which are described in detail below by way of example:
(embodiment mode 1)
Fig. 7 is a flowchart showing temperature control of the melting furnace according to embodiment 1.
First, in step S1, a database is constructed by acquiring (described later) the distance required for the water pack 1 to advance or retreat within the melting furnace 2 in order to reach the temperature of the melting furnace 2 to a desired temperature (for example, 1100 ℃) at each position (x) of the water pack 1 and at each temperature of the melting furnace 2, and associating these data (specifically, 3 of the water pack position, the melting furnace temperature, and the water pack movement distance) with each other.
Tables 1 to 3 below are examples of the databases obtained at step S1.
[ TABLE 1 ]
Table 1 shows the melting furnace temperature and the movement distance of the water pack in the case of x = 0. Wherein "x =0" indicates that the water pack 1 is located outside the melting furnace 2 and does not enter the melting furnace 2. The data in table 1 are interpreted as follows:
for example, when the melting furnace temperature is 1105 deg.C, it is higher than the desired temperature (e.g., 1100 deg.C). In order to cool the melting furnace 2 to 1100 ℃, it is necessary to cool the melting furnace 2 by introducing the water pack 1 into the melting furnace 2 from the current position (outside the melting furnace), and in table 1, the introduction distance of the water pack 1 is 250mm. As another example, when the melting furnace temperature is 1120 ℃, the water pack 1 should enter the melting furnace 2 from the current position (outside the melting furnace) with a traveling distance of 1000mm inside the melting furnace 2. And so on.
In table 1, when the melting furnace temperature is 1085 ℃, 1090 ℃, 1095 ℃ (i.e., less than 1100 ℃), the movement distance of the water bag 1 is 0 because the water bag 1 remains outside the melting furnace 2 and does not need to be moved.
[ TABLE 2 ]
Table 2 shows the melting furnace temperature and the movement distance of the water pack in the case of x = 200. Wherein "x =200" indicates that the water bag 1 is located at a position of 200mm into the melting furnace 2. Table 2 the data are interpreted as follows:
for example, when the melting furnace temperature is 1085 ℃, the movement distance of the water bag 1 from the current position is-200 mm. Here, "-" indicates withdrawal, that is, the water bag 1 should be withdrawn by 200mm from the current position when the melting furnace temperature is 1085 ℃.
In Table 2, the moving distance of the water bag 1 was-200 mm at 1085 ℃ and 1090 ℃ melting temperatures. This is because the water bag 1 is withdrawn out of the melting furnace 2 when the water bag 1 is withdrawn 200mm at the current position x, and further withdrawal is not required.
For example, when the melting furnace temperature is 1120 ℃, the water pack 1 should advance a distance of 980mm from the current position (x = 200) within the melting furnace 2.
[ TABLE 3 ]
Table 3 shows the melting furnace temperature and the movement distance of the water pack in the case of x = 500. "x =500" indicates that the water bag 1 is located 500mm into the melting furnace 2. The data interpretation is the same as in Table 2 and will not be described again.
The above description has been given of the three examples of tables 1 to 3 with respect to the database in which the three of the water pocket position, the melting furnace temperature, and the water pocket moving distance are associated with each other, but the present invention is not limited to this. The more data (the more detailed) on the position of the water pack, the temperature of the melting furnace, and the moving distance of the water pack, the more accurate the temperature control of the glass melting furnace can be performed.
For example, in tables 1 to 3, the interval of the melting furnace temperature is 5 ℃. In order to be able to control the temperature of the glass melting furnace precisely, the interval between the melting furnace temperatures may also be 1 ℃ or 0.1 ℃.
In tables 1 to 3, x is 0, 200, or 500, respectively. In order to accurately control the temperature of the glass melting furnace, the interval between x in each table may be 10mm or 1mm, and for example, x in each table may be 0, 10, 20, 30, … … 1990, 2000, or 0, 1, 2, 3, 4, … …, and the numerical unit is mm.
As can be seen from the databases represented in tables 1 to 3, the water bag is advanced in the furnace to increase the cooling area of the water bag in the furnace when the furnace temperature is higher than a first temperature (for example, 1100 ℃ C. As desired), and is retracted in the furnace to decrease the cooling area of the water bag in the furnace when the furnace temperature is lower than the first temperature.
The databases represented in tables 1 to 3 are obtained for water packs and melting furnaces having a predetermined structure. According to parameters such as the shape, the size, the type of a cooling medium and the material of the water bag, the shape, the size and the temperature of the melting furnace are matched, and the distance for enabling the water bag to move forwards or backwards in the melting furnace when the temperature of the melting furnace reaches the first temperature is obtained through experiments. When the structure of the water drum or the melting furnace is changed, the heat transfer characteristics such as the heat capacity thereof are also changed accordingly, and thus the moving distance of the water drum according to the position of the water drum and the temperature of the melting furnace is also changed accordingly. In this case, it is necessary to newly obtain a database in which 3 of the water pack position, the melting furnace temperature, and the water pack moving distance correspond to each other for the changed water pack and melting furnace.
In step S2, the current temperature of the melting furnace 2 is measured using a temperature sensor (e.g., a thermocouple). The temperature of the melting furnace 2 may be a temperature of a specific portion in the melting furnace 2 (for example, a wall, a floor, or the like of the melting furnace 2) or may be a temperature of a molten glass flow path of the melting furnace 2. Since the purpose of the present invention is to control the temperature of the molten glass at a predetermined temperature (i.e., 1100 ℃), the temperature of the molten glass flow path is defined as the temperature of the melting furnace 2 in the present embodiment.
In step S3, it is determined whether or not the measured current temperature of the melting furnace 2 is within a predetermined temperature range. The predetermined temperature range here may be the first temperature value (1100 ℃) described above, or may be a predetermined range centered on the first temperature value (for example, 1100 ℃ ± 0.5 ℃). When the melting furnace temperature is within the predetermined range (1100 ℃. + -. 0.5 ℃), the same effect as when the melting furnace temperature is at the first temperature (1100 ℃) can be obtained.
In the present embodiment, the predetermined range is 1100 ℃. + -. 0.5 ℃ (i.e., 1099.5 ℃ -1100.5 ℃). When the temperature of the melting furnace 2 is within the predetermined range, it is indicated that the temperature of the molten glass in the melting furnace 2 is appropriate, and it is not necessary to move the water pack 1 to change the cooling of the melting furnace 2.
If the current temperature of the melting furnace 2 measured in step S2 is within the predetermined range, the flow of temperature control of the melting furnace according to the present embodiment is terminated. If the measured current temperature of the melting furnace 2 is not within the prescribed range, the process proceeds to step S4.
In step S4, the current position (x) of the water package 1 is obtained. The current position of the water bag 1 may be obtained by a position sensor provided on the water bag, by calculating the moving distance of the water bag 1 (see the above description), or by providing a camera for imaging the water bag 1 in the melting furnace 2, and by recognizing the current position of the water bag 1 from the captured water bag picture.
In step S5, the distance to advance/retreat of the water pocket corresponding to the water pocket position and the melting furnace temperature is obtained from the water pocket position (current position x) obtained in step S4 and the melting furnace temperature measured in step S2 with reference to the database obtained in step S1. For example, if the current position of the water pack 1 is x =500 and the melting furnace temperature is 1110 ℃, it can be known with reference to table 3 that the water pack should advance from the current position by a distance of 450mm.
In step S6, the user may input a control command including the information on the distance obtained in step S5, for example, to move the water pack 1 forward by 450mm in the melting furnace 2, through the control unit 4 to control the water pack moving system 3 and move the water pack 1 through the water pack moving system 3. Thereby, a larger part of the water bag 1 enters the melting furnace 2, and the melting furnace 2 is cooled by increasing the cooling area of the water bag 1 entering the melting furnace 2.
The control unit 4 may be controlled manually or automatically.
In step S7, after the water pack 1 is advanced within the melting furnace 2 by a predetermined distance (for example, 450 mm) in step S6, the current temperature of the melting furnace 2 is measured again by the temperature sensor for a predetermined time (step S7). The set time is defined by the user, and in the present embodiment, for example, the set time is defined as 10 minutes. That is, after the water pack 1 is advanced a predetermined distance in the melting furnace 2 in step S6, the current temperature of the melting furnace 2 is measured again by the temperature sensor after 10 minutes.
After step S7, the process returns to step S3, and the flow of S3 to S7 is executed again until the current temperature of the melting furnace 2 falls within the predetermined range (1099.5 to 1100.5 ℃).
According to the temperature control method of the present invention, the temperature in the melting furnace can be accurately controlled, and thereby the cooling of the molten glass can be made uniform, the uniformity of the glass thickness can be improved, and the bubble rate in the glass can be reduced.
(embodiment mode 2)
The method for controlling the temperature of the melting furnace according to embodiment 1 is explained above, and the method for controlling the temperature of the melting furnace according to embodiment 2 is explained below.
FIG. 8 is a flowchart showing temperature control of the melting furnace according to embodiment 2.
First, in step S21, the current temperature of the melting furnace 2 is measured by the temperature sensor. The temperature of the melting furnace 2 may be a temperature of a specific portion in the melting furnace 2 (for example, a wall, a floor, or the like of the melting furnace 2) or may be a temperature of a molten glass flow path of the melting furnace 2.
In step S22, it is determined whether or not the measured current temperature of the melting furnace 2 is within a predetermined temperature range. The predetermined temperature range herein may be a predetermined value (for example, 1100 ℃) or a predetermined range (for example, 1100 ℃. + -. 0.5 ℃). In the present embodiment, the predetermined temperature range is 1100 ℃. + -. 0.5 ℃ (i.e., 1099.5 ℃ -1100.5 ℃).
If the current temperature of the melting furnace 2 measured in S21 is within the predetermined temperature range, the flow of the temperature control of the melting furnace according to the present embodiment is terminated. If the measured current temperature of the melting furnace 2 is not within the prescribed range, the process proceeds to step S23.
In step S23, the current position of the water package 1 is obtained. The current position of the water bag 1 may be obtained by a position sensor provided on the water bag, by calculating the moving distance of the water bag 1 (see the above description), or by providing a camera for imaging the water bag 1 in the melting furnace 2, and by recognizing the current position of the water bag 1 from the captured water bag picture.
In step S24, a PID (Proportional Integral Derivative) calculation is performed based on the current position of the water pack obtained in step S23 and on the difference between the temperature of the melting furnace obtained in step S21 and the temperature in the predetermined temperature range, and the distance required for the water pack 1 to advance or retreat in the melting furnace 2 in order to reach the predetermined temperature range (1099.5-1100.5 ℃) is obtained. For example, the distance obtained is 500mm.
In the case of the proportional integral derivative control, the adjustment range of the proportional coefficient may be 0.1 to 100, the adjustment range of the integral time may be 0.01 to 120 seconds, and the adjustment range of the derivative time may be 0.04 to 120 seconds. The forward or backward distance of the water bag in the melting furnace is obtained by proportional integral derivative calculation according to the shape, size, cooling medium type, material of the water bag and other parameters of the water bag and the shape, size and temperature of the melting furnace, and the detailed description of the proportional integral derivative control is omitted in the present specification because the proportional integral derivative control belongs to the prior art.
In step S25, the user can input (manually or automatically) a control command including the information on the distance obtained in step S24 through the control unit 4 to control the water bag moving system 3, and move the water bag 1 forward by 500mm in the melting furnace 2 through the water bag moving system 3.
In step S26, after the water pack 1 is moved forward by a predetermined distance (for example, 500 mm) in the melting furnace 2 in step S25, the current temperature of the melting furnace 2 is measured again by the temperature sensor for a predetermined time. The set time is defined by the user, and in the present embodiment, for example, the set time is defined as 10 minutes. That is, after the water pack 1 is advanced a certain distance in the melting furnace 2 in the step S25, the current temperature of the melting furnace 2 is measured again by the temperature sensor after 10 minutes.
After step S26, the process returns to step S22, and the flow of S22 to S26 is re-executed until the current temperature of the melting furnace 2 falls within the predetermined temperature range (1099.5 to 1100.5 ℃).
According to the temperature control method of embodiment 2, the temperature in the melting furnace can be accurately controlled, and the molten glass can be uniformly cooled, the uniformity of the glass thickness can be increased, and the bubble rate in the glass can be decreased.
The method for controlling the temperature of the melting furnace according to embodiments 1 and 2 of the present invention is explained above. However, it is apparent that embodiments 1 and 2 are merely preferred embodiments of the method for controlling the temperature of a melting furnace according to the present invention, and the present invention is not limited thereto. The embodiments 1 and 2 can be modified by those skilled in the art, and the modified embodiments are also included in the disclosure of the present invention.
For example, in embodiment 1, the step S4 of obtaining the current position of the water drum 1 is performed between the steps S3 and S5, but the present invention is not limited thereto, and the step of obtaining the current position of the water drum 1 may be performed between the steps S1 and S2 or between the steps S2 and S3. In embodiment 2, step S23 of obtaining the current position of the water pack 1 is performed between step S22 and step S24, but the present invention is not limited to this, and the step of obtaining the current position of the water pack 1 may be performed before step S21 or between step S21 and step S22.
In embodiments 1 and 2, the melting furnace was cooled using one water drum. However, the present invention is not limited to this, and a plurality of (two or three or more) water pockets may be provided in parallel on the same horizontal plane, and the melting furnace may be cooled by a plurality of water pockets connected in series or in parallel.
In embodiments 1 and 2, the water drum moves forward and backward along the cross member. However, the present invention is not limited to this, and the water drum may be mounted on a water drum carriage having rollers, and the water drum may be moved by moving the water drum carriage.
Claims (10)
1. A temperature control method of a float glass melting furnace is characterized by comprising the following steps:
a melting furnace temperature obtaining step: acquiring the temperature of a melting furnace; and
advancing and retreating the water drum: the obtained melting furnace temperature is compared with a set first melting furnace temperature, and the water used for cooling the melting furnace moves forward or backward in the melting furnace according to the height relation of the obtained melting furnace temperature and the set first melting furnace temperature.
2. The method of claim 1, wherein the step of advancing and retracting further comprises:
a water drum advancing and retreating distance obtaining step: and acquiring the distance for advancing or retreating the water bag in the melting furnace according to each melting furnace temperature in order to enable the melting furnace temperature to reach the first temperature.
3. The temperature control method according to claim 2, characterized in that: before the step of acquiring the advancing and retreating distance of the water drum, a step of acquiring the current position of the water drum in the melting furnace is also arranged;
advancing the water drum by the distance from the current position when the temperature of the melting furnace is higher than the first temperature in the water drum advancing and retreating step; and under the condition that the temperature of the melting furnace is lower than the first temperature, the water drum is retreated from the current position by the distance.
4. The temperature control method according to claim 3, characterized in that:
the current position of the water bag is obtained by a position sensor arranged on the water bag, or obtained by calculating the moving distance of the water bag, or obtained by shooting by a camera arranged in the melting furnace.
5. The temperature control method according to any one of claims 2 to 4, characterized in that:
in the water bag advancing/retracting distance acquiring step, a proportional integral derivative calculation is performed based on a difference between the melting furnace temperature and the first temperature to obtain a distance that the water bag needs to advance or retract in the melting furnace in order to make the melting furnace temperature reach the first temperature.
6. The temperature control method according to any one of claims 2 to 4, characterized in that:
in the step of acquiring the advancing and retreating distance of the water drum, the distance that the water drum needs to advance or retreat in the melting furnace when the temperature of the melting furnace reaches the first temperature is obtained through experiments according to the shape and size of the water drum, the type of the cooling medium, and the material of the water drum.
7. The temperature control method according to claim 6, characterized in that: the current position of the water drum, the temperature of each melting furnace and the obtained advance and retreat distances of the water drum corresponding to the temperature of each melting furnace are mutually associated to form a database in advance;
in the water drum advancing and retreating step, the water drum advancing and retreating distance corresponding to the current position of the water drum and the obtained temperature of the melting furnace is searched from the database, and the water drum is made to advance or retreat within the melting furnace from the current position by the distance.
8. The temperature control method according to any one of claims 1 to 7, characterized in that:
the melting furnace temperature is the temperature of a molten glass flow channel of the melting furnace.
9. The temperature control method according to any one of claims 1 to 8, characterized in that:
the water drum is a pipe which is bent into a U shape integrally from a pipe material, the closed end of the U shape faces the melting furnace with the front end, and the two open ends of the U shape are respectively provided with a water inlet and a water outlet.
10. The temperature control method according to claim 9, characterized in that:
the water drum is driven to advance or retreat in the melting furnace through a water drum moving system, and the water drum moving system comprises: a motor for driving the water drum to move forward or backward in the melting furnace; a beam fixed outside the melting furnace; and a suspension part which can move along the beam under the driving of the motor, the rear end where the U-shaped opening of the water drum is positioned is fixed and suspended on the suspension part,
the motor of the water drum moving system is connected with a control part in a wired or wireless way, and the control part controls the water drum to enter and exit the melting furnace through the motor.
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