CN115636571B - Temperature control method for float glass melting furnace - Google Patents
Temperature control method for float glass melting furnace Download PDFInfo
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- CN115636571B CN115636571B CN202211421848.2A CN202211421848A CN115636571B CN 115636571 B CN115636571 B CN 115636571B CN 202211421848 A CN202211421848 A CN 202211421848A CN 115636571 B CN115636571 B CN 115636571B
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- 238000002844 melting Methods 0.000 title claims abstract description 143
- 230000008018 melting Effects 0.000 title claims abstract description 143
- 238000000034 method Methods 0.000 title claims abstract description 32
- 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 214
- 239000011521 glass Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 27
- 239000006060 molten glass Substances 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 9
- 239000000498 cooling water Substances 0.000 description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 4
- 239000000156 glass melt Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 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
- 239000002994 raw material Substances 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 drum advancing and retreating step: comparing the obtained melting furnace temperature with a set melting furnace first temperature, and enabling a water drum for cooling the melting furnace to advance or retreat in the melting furnace according to the height relation of the melting furnace temperature and the set melting furnace first temperature. According to the method for controlling the temperature of the float glass furnace, the temperature in the furnace can be accurately controlled, so that the cooling of the glass liquid is uniform, the uniformity of the glass thickness is improved, and the bubble rate in the glass is reduced.
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 float glass production process generally includes: the glass raw material is put into a melting furnace, melted at high temperature, and then the melted glass flows into a tin bath from the melting furnace and floats on the surface of tin liquid with high relative density in the tin bath, and the float glass product is obtained through further flattening, hardening, cooling, annealing and cutting. Since the float glass is formed at a temperature of about 1100 ℃ in the tin bath, it is necessary to cool the molten glass from a high temperature (e.g., about 1350 ℃) to about 1100 ℃ before flowing the molten glass from the melting furnace into the tin bath.
In the conventional float glass production process, in order to cool down the molten glass to an appropriate temperature, a fan is usually provided outside the glass melting furnace, and the fan is operated to blow air into the melting furnace to cool down 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 precisely controlled. In addition, the temperature difference between the wind temperature and the molten glass is too large, which causes rapid cooling of the surface of the glass and uneven cooling of the entire glass during cooling, so that there are problems that the uniformity of the thickness of the glass is reduced and the bubble rate in the glass is increased.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for controlling the temperature of a float glass furnace, which can control the temperature in the furnace precisely, thereby making it possible to uniformly cool the molten glass, to increase the uniformity of the glass thickness, and to decrease the bubble rate in the 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 drum advancing and retreating step: comparing the obtained melting furnace temperature with a set melting furnace first temperature, and enabling a water drum for cooling the melting furnace to advance or retreat in the melting furnace according to the height relation of the melting furnace temperature and the set melting furnace first temperature.
In one embodiment, the method for controlling temperature further comprises: the water drum advancing and retreating distance obtaining step: according to each melting furnace temperature, a distance for making the water drum advance or retreat in the melting furnace is acquired in order to make the melting furnace temperature reach the first temperature.
In the temperature control method according to one embodiment, a step of obtaining the current position of the ladle in the melting furnace is further provided before the step of obtaining the advance and retreat distance of the ladle; in the step of advancing and retreating the water drum, the water drum is advanced from the current position by the distance when the melting furnace temperature is higher than the first temperature, and the water drum is retreated from the current position by the distance when the melting furnace temperature is lower than the first temperature.
In one embodiment of the temperature control method, in the ladle advancing and retreating distance obtaining step, a proportional-integral-derivative calculation is performed based on a difference between the furnace temperature and the first temperature to obtain a distance that the ladle needs to advance or retreat in the furnace in order to reach the first temperature.
In the temperature control method according to one embodiment, in the step of obtaining the distance between the advance and the retreat of the ladle, the distance for the ladle to advance or retreat in the melting furnace is obtained by experiment according to the shape, the size, the type of the cooling medium, the material of the ladle, the shape, the size and the temperature of the melting furnace.
In one embodiment of the temperature control method, the current position of the water drum, the temperatures of the melting furnaces and the obtained advance and retreat distances of the water drum corresponding to the temperatures of the melting furnaces are correlated in advance to form a database; 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 melting furnace temperature is searched from a database, so that the water drum advances or retreats in 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 in the water drum, or by calculating the moving distance of the water drum, or by photographing with a camera provided in the melting furnace.
In one embodiment, the furnace temperature is a temperature of a glass melt channel of the furnace.
In the temperature control method of one mode, the water drum is a pipe which is formed by bending a pipe material into a U shape, the closed end of the U shape faces the melting furnace, and the two ends of the opening of the U shape are respectively provided with a water inlet and a water outlet.
In one mode 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 comprises: a motor for driving the water drum to advance or retreat in the melting furnace; the cross beam is fixed outside the melting furnace; and the hanging part can move along the cross beam under the drive of the motor, the rear end of the U-shaped opening of the water drum is fixed and hung on the hanging 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.
Technical effects
According to the method for controlling the temperature of the float glass furnace, the temperature in the furnace can be accurately controlled, so that the cooling of the glass liquid 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 illustration of a water drum prior to entry into a float glass furnace.
FIG. 2 is a schematic illustration of a water drum entering a float glass furnace.
Fig. 3 is a perspective view of the water-bag cooling apparatus as seen from one side of the water-bag.
Fig. 4 is a perspective view of the water drum when the water drum is viewed from obliquely above.
Fig. 5 is a cross-sectional view of the water-in-water cooling device.
Fig. 6 is a photograph of a real object of the cooling device in water shown in fig. 3 and 5.
Fig. 7 is a flowchart showing temperature control in the float glass furnace according to embodiment 1.
Fig. 8 is a flowchart showing temperature control in the float glass furnace according to embodiment 2.
Detailed Description
Next, preferred modes for carrying out the present invention will be described. 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 drum cooling device to regulate the temperature in the float glass melting furnace, and precisely controls the temperature in the melting furnace by controlling the forward or backward distance of a water drum in the water drum cooling device in the melting furnace.
Referring to fig. 1 to 5, a water-in-water cooling apparatus capable of cooling a float glass furnace 2 (hereinafter, sometimes simply referred to as a furnace 2) includes: a water drum 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 drum moving system 3. The water-in-water moving system 3 includes: a motor 31 for driving the ladle 1 to advance or retract the ladle 1 in the melting furnace 2; a cross beam 32 fixed outside the melting furnace 2; and a hanging part 33 which can move along the beam 32 under the drive of the motor 31, wherein the water drum is fixed with the connecting end of the external water source and hung on the hanging part 33.
FIG. 1 is a schematic illustration of a water drum prior to entry into a furnace. FIG. 2 is a schematic illustration of a water drum entering a furnace.
In fig. 1 and 2, a water drum 1 is communicated with an external water source (not shown), and a cooling water from the external water source flows into the water drum 1 by a water pump (not shown) to cool a melting furnace 2. The cooling water from the external water source can be circulating cooling water or disposable cooling water.
The water drum moving system 3 can move the water drum 1 in a predetermined direction (left-right direction in the present embodiment) under the control of the control unit 4, so that the water drum 1 can freely enter and exit the melting furnace 2. The specific configuration of the water drum moving system 3 will be described later with reference to fig. 3 to 5.
Fig. 3 is a perspective view of the water-bag cooling apparatus as seen from one side of the water-bag. Fig. 4 is a perspective view of the water drum when the water drum connected to the water pipe is viewed from obliquely above the water drum. Fig. 5 is a sectional view of the water drum cooling device, which is a sectional view perpendicular to the ground and parallel to the moving direction of the water drum.
Here, fig. 3 shows the case where the ladle 1 is moved a distance into the melting furnace 2. Fig. 5 shows the case where the ladle 1 is positioned outside the melting furnace 2. As shown in fig. 5, the furnace wall 2a of the furnace 2 is provided with an opening 2b, from which opening 2b the water drum 1 can enter and exit the furnace 2.
As shown in fig. 4, the water drum 1 is a tube having a U-shape as a whole. The water drum 1 includes: a first cross tube 1a; a transfer tube 1b connected to the first horizontal tube; a second transverse tube 1c connected to the transfer tube; a first vertical pipe 1d connected to the first horizontal pipe 1a; a third cross pipe 1f connected to the first standpipe 1d; a second standpipe 1e connected to the second cross pipe; and a fourth cross pipe 1g connected to the second standpipe 1 e. The water drum 1 formed by the first transverse pipe 1a, the switching pipe 1b, the second transverse pipe 1c, the first vertical pipe 1d, the third transverse pipe 1f, the second vertical pipe 1e and the fourth transverse pipe 1g is U-shaped. By forming the water drum 1 integrally in a U-shape, the cooling area of the water drum 1 can be increased.
The water drum 1 does not necessarily include the first vertical pipe 1d, the third horizontal pipe 1f, the second vertical pipe 1e, and the fourth horizontal pipe 1g, but may include only the first horizontal pipe 1a, the adapter pipe 1b, and the second horizontal pipe 1c. The water bag formed by the first transverse pipe 1a, the switching pipe 1b and the second transverse 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 drum 1 is preferably in the range of 8000mm to 14000 mm. Here, the length of the water drum 1 refers to the length of the water drum 1 in the direction in which the tube extends. In the present embodiment, the lengths of the first lateral pipe 1a and the second lateral pipe 1c are 3790mm, the length of the adapter pipe 1b is 320mm, the lengths of the first vertical pipe 1d and the second vertical pipe 1e are 870mm, the lengths of the third lateral pipe 1f and the fourth lateral pipe 1g are 1310mm, and the overall length of the water drum 1 is 12260mm, which is the total length of the pipes obtained by adding the lengths of these pipes. However, the length of the ladle 1 is not limited to this, and may be appropriately adjusted according to the volume of the furnace 2, the size of the opening 2b of the furnace 2, the power of the motor 31, and the like.
The pipe diameter of the water drum 1 is preferably in the range of 50mm to 150mm, and in this embodiment, 100mm. The water drum is formed of a material that can withstand the high temperatures in the furnace and has good heat transfer properties. In this embodiment, the material forming the water pocket is mainly iron.
Referring to fig. 3 and 5, cooling water from an external water source (e.g., a tap water pipe) flows through a flexible pipe (not shown), a water pipe 41, and the water drum 1. Wherein the flexible tube is received in the tube receiving portion 42, including a flexible water inlet tube and a flexible water outlet tube. The water pipe 41 is formed of the same material as the water drum 1, and includes a water inlet pipe 41a and a water outlet pipe 41b.
In fig. 4, the water inlet pipe 41a is a standpipe and communicates with the third cross pipe 1f; the water outlet pipe 41b is a vertical pipe and is communicated with the fourth transverse pipe 1g. That is, the cooling water from the external water source flows through the flexible water inlet pipe, the water inlet pipe 41a, the third transverse pipe 1f, the first vertical pipe 1d, the first transverse pipe 1a, the transfer pipe 1b, the second transverse pipe 1c, the second vertical pipe 1e, the fourth transverse pipe 1g, the water outlet pipe 41b and the flexible water outlet pipe in sequence.
In the case where the water drum 1 does not include the first vertical pipe 1d, the third horizontal pipe 1f, the second vertical pipe 1e, and the fourth horizontal pipe 1g, but includes only the first horizontal pipe 1a, the adapter pipe 1b, and the second horizontal pipe 1c, the water inlet pipe 41a communicates with the first horizontal pipe 1a, and the water outlet pipe 41b communicates with the second horizontal pipe 1c.
As shown in fig. 3 and 5, a beam 32 extending in the moving direction of the ladle 1 (the direction of advancing and retreating 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 support 38 in fig. 5), and is not particularly limited as long as the beam 32 can be supported.
The cross member 32 is provided with a rail extending in the moving direction of the water drum 1. Below the cross beam 32, a hanging portion 33 for fixing and hanging the water drum 1 is provided. The hanging portion 33 is provided with a roller 34. The rollers 34 are embedded in the grooved rail and roll along the grooved rail on the cross beam 32, thereby driving the hanging part 33 to move. The rear ends (the third cross pipe 1f and the fourth cross pipe 1 g) of the water drum 1 are fixed and suspended by the suspending portion 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 member 32.
In fig. 3 and 5, a support portion 35 for supporting the ladle 1 is provided at a position closer to the melting furnace 2 than the hanging portion 33. The support 35 includes a drum 351 rotatable along a central axis above, and the drum 351 is in contact with the water drum 1, specifically, a section of the water drum 1 (the first lateral tube 1a, the adapter tube 1b, and the second lateral tube 1 c) at the closed end of the U-shape is bridged on the drum 351. When the drum 1 moves forward and backward with respect to the melting furnace 2, the drum 351 may rotate by friction of the drum 1. The drum 351 has not only a function of guiding the movement of the water drum 1 but also a function of reducing the resistance of the supporting portion 35 to the water drum 1.
In the present embodiment, since the ladle 1 moves linearly along the cross member 32, the position of the ladle 1 can be calculated from the distance the ladle 1 enters the melting furnace 2. Instead, the distance of the ladle 1 into the furnace 2 is calculated from the position of the ladle 1. Therefore, in the present embodiment, the position of the water drum 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 mobile system 3 via a 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 program is, for example, an application program for controlling the temperature of the melting furnace.
The display of the control unit 4 can display the furnace temperature, a desired value of the furnace temperature (corresponding to the first temperature of the summary section), a selection button of a manual control system or an automatic control system of the furnace temperature, a button for advancing/retreating the water drum, a maximum value, a minimum value, and the like of the movement range of the water drum on the display screen of the application program. The user can control the water drum moving system 3 by inputting a control command through a display screen of an application program on the display, and move the water drum 1 in a predetermined direction through the water drum moving system 3.
Fig. 6 is a photograph of a real object of the cooling device in water shown in fig. 3 and 5.
The water drum 1 shown in fig. 3 to 6 is merely an example, and the shape and structure thereof are not particularly limited as long as the water drum can be moved into and out of the melting furnace 2 to cool the melting furnace 2 to a desired temperature (for example, 1100 ℃). The forward and backward movement of the water drum 1 is not limited to a straight line, and may be a curved line.
The precise control of the temperature in a float glass furnace using the above-described water-in-water cooling device can be implemented in a number of ways, examples of which are as follows:
(embodiment 1)
Fig. 7 is a flowchart showing temperature control of the melting furnace according to embodiment 1.
First, in step S1, the distance by which the water drum 1 is advanced or retracted within the furnace 2 in order to reach the temperature of the furnace 2 to a desired temperature (for example, 1100 ℃) at each position (x) of the water drum 1 and each temperature of the furnace 2, which will be described later, is acquired (the acquisition explanation), and these data (specifically, 3 of the water drum position, the furnace temperature, and the water drum movement distance) are correlated to each other to form a database.
Tables 1 to 3 below are examples of the database obtained in step S1.
[ Table 1 ]
Table 1 shows the furnace temperature and the water drum travel distance for the case of x=0. Where "x=0" means that the water drum 1 is located outside the furnace 2 and does not enter the furnace 2. Table 1 data is read as follows:
for example, when the furnace temperature is 1105 ℃, it is higher than a desired temperature (for example, 1100 ℃). In order to cool the furnace 2 to 1100 ℃, it is necessary to cool the furnace 2 by bringing the ladle 1 into the furnace 2 from the current position (outside the furnace), and the distance of the entry of the ladle 1 is 250mm in table 1. For another example, when the furnace temperature is 1120 ℃, the ladle 1 should be introduced into the furnace 2 from the current position (outside the furnace), and the advancing distance in the furnace 2 is 1000mm. And so on.
In table 1, when the furnace temperature was 1085 ℃, 1090 ℃, 1095 ℃ (i.e., lower than 1100 ℃), the state in which the water drum 1 was located outside the furnace 2 was maintained, and movement was not required, so the movement distance of the water drum 1 was 0.
[ Table 2 ]
Table 2 shows the furnace temperature and the water drum travel distance for the case of x=200. Where "x=200" means that the water drum 1 is located 200mm into the furnace 2. Table 2 data is read as follows:
for example, when the furnace temperature is 1085 ℃, the moving distance of the water drum 1 from the current position is-200 mm. Here "-" means that the ladle 1 should be retracted by 200mm from the current position when the furnace temperature is 1085 ℃.
In Table 2, the moving distance of the ladle 1 was-200 mm when the furnace temperature was 1085℃and 1090 ℃. This is because the current position x of the ladle 1 is 200, and when the ladle 1 is retracted by 200mm, it is retracted to the outside of the furnace 2, and no further retraction is required.
For example, when the furnace temperature is 1120 ℃, the water drum 1 should be advanced within the furnace 2 from the current position (x=200) by a distance of 980 mm.
[ Table 3 ]
Table 3 shows the furnace temperature and the water drum travel distance for the case of x=500. "x=500" means that the water drum 1 is located 500mm into the furnace 2. The data interpretation is the same as in table 2 and will not be repeated.
In the above, the three examples of tables 1 to 3 are listed as the database for associating the three of the ladle position, the melting furnace temperature, and the ladle moving distance with each other, but the present invention is not limited to this. The more (more detailed) the data on the three of the ladle position, the furnace temperature and the ladle moving distance, the more accurate the temperature control of the glass furnace is possible.
For example, in tables 1 to 3, the interval between the melting furnace temperatures is 5 ℃. In order to accurately control the temperature of the glass melting furnace, the interval between the melting furnace temperatures may be 1℃or 0.1 ℃.
In tables 1 to 3, x is 0, 200, or 500, respectively. In order to precisely control the temperature of the glass melting furnace, the intervals of x in each table may be set to 10mm or 1mm, and for example, x in each table may be set to 0, 10, 20, 30, … … 1990, 2000 or 0, 1, 2, 3, 4, … …, respectively, in mm.
From the databases represented in tables 1-3, it is known to advance the water drum within the furnace to increase the cooling area of the water drum within the furnace when the furnace temperature is above a first temperature (e.g., 1100 c, as desired), and to retract the water drum within the furnace to decrease the cooling area of the water drum within the furnace when the furnace temperature is below the first temperature.
The databases represented in tables 1 to 3 were obtained for water bags and kilns having a specific structure. According to the shape, size, cooling medium type, material for making the water drum and other parameters, the shape, size and temperature of the melting furnace are matched, and 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. When the structure of the ladle and the furnace is changed, the heat transfer characteristics such as the heat capacity are changed accordingly, and therefore the movement distance of the ladle corresponding to the position of the ladle and the temperature of the furnace is also changed accordingly. In this case, it is necessary to retrieve databases for the changed water drum and the furnace, which correspond 3 of the water drum position, the furnace temperature, and the water drum moving distance to each other.
In step S2, the current temperature of the furnace 2 is measured with a temperature sensor (e.g., thermocouple). The temperature of the melting furnace 2 may be a temperature of a specific portion (for example, a wall, a floor, or the like of the melting furnace 2) in the melting furnace 2, or a temperature of a glass-melt flow path of the melting furnace 2. Since the purpose of the present invention is to control the temperature of the molten glass to a predetermined temperature (i.e., 1100 ℃), the temperature of the molten glass channel is defined as the temperature of the melting furnace 2 in the present embodiment.
In step S3, it is determined whether the measured current temperature of the melting furnace 2 is within a predetermined temperature range. The predetermined temperature range may be the first temperature value (1100 ℃) described above, or may be a predetermined range (for example, 1100±0.5 ℃) around the first temperature value. When the furnace temperature is within the prescribed range (1100 ℃.+ -. 0.5 ℃), the same effect as when the 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 ℃ to 1100.5 ℃). When the temperature of the melting furnace 2 falls 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 change the cooling of the melting furnace 2 by moving the ladle 1.
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 ended. 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 drum 1 is obtained. The current position of the water drum 1 may be obtained by a position sensor provided in the water drum, by calculating the moving distance of the water drum 1 (see the foregoing description), or by providing a camera for capturing the image of the water drum 1 in the melting furnace 2, and recognizing the current position of the water drum 1 from the captured water drum photograph.
In step S5, the distance by which the water drum should advance/retreat is obtained according to the water drum 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 drum 1 is x=500 and the furnace temperature is 1110 ℃, it can be known with reference to table 3 that the water drum should be advanced by a distance of 450mm from the current position.
In step S6, the user can control the water drum moving system 3 by inputting a control command through the control unit 4 to move the water drum 1 via the water drum moving system 3, wherein the input control command contains the information on the distance obtained in step S5, for example, advancing 450mm in the melting furnace 2. Thereby, more of the water drum 1 is allowed to enter the furnace 2, and the furnace 2 is cooled by increasing the cooling area of the water drum 1 entering the furnace 2.
The control unit 4 may be controlled manually or automatically.
In step S7, after step S6 is performed to advance the ladle 1a predetermined distance (for example, 450 mm) in the furnace 2, the current temperature of the furnace 2 is measured again by the temperature sensor for a predetermined time (step S7). Here, 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 drum 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 flow returns to step S3, and the processes of S3 to S7 are re-executed until the current temperature of the melting furnace 2 is within a predetermined range (1099.5 ℃ to 1100.5 ℃).
According to the temperature control method 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 thickness of the glass is improved, and the bubble rate in the glass is reduced.
(embodiment 2)
The method of controlling the temperature of the melting furnace according to embodiment 1 is described above, and the method of controlling the temperature of the melting furnace according to embodiment 2 is described 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 furnace 2 is measured by a temperature sensor. The temperature of the melting furnace 2 may be a temperature of a specific portion (for example, a wall, a floor, or the like of the melting furnace 2) in the melting furnace 2, or a temperature of a glass-melt flow path of the melting furnace 2.
In step S22, it is determined whether the measured current temperature of the melting furnace 2 is within a predetermined temperature range. The predetermined temperature range 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 ℃ to 1100.5 ℃).
If the current temperature of the melting furnace 2 measured in S21 is within the predetermined temperature range, the flow of temperature control of the melting furnace of the present embodiment is ended. 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 drum 1 is obtained. The current position of the water drum 1 may be obtained by a position sensor provided in the water drum, by calculating the moving distance of the water drum 1 (see the foregoing description), or by providing a camera for capturing the image of the water drum 1 in the melting furnace 2, and recognizing the current position of the water drum 1 from the captured water drum photograph.
In step S24, proportional integral derivative (Proportional Integral Derivative: PID) calculation is performed based on the current position of the ladle obtained in step S23 and based 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 by which the ladle 1 needs to be moved forward or backward in the melting furnace 2 in order to reach the melting furnace temperature in the predetermined temperature range (1099.5 ℃ C. To 1100.5 ℃ C.) is obtained. For example, the obtained distance was 500mm.
In 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 drum in the melting furnace is also obtained by proportional integral derivative calculation according to parameters such as the shape, size, type of cooling medium, material for making the water drum, and the like of the water drum, and the shape, size and temperature of the melting furnace.
In step S25, the user can control the water drum moving system 3 by inputting (manual control or automatic control) a control command including the information of the distance obtained in step S24 through the control unit 4, and advance the water drum 1 by 500mm in the melting furnace 2 via the water drum moving system 3.
In step S26, after step S25 is performed to advance the ladle 1a predetermined distance (for example, 500 mm) in the melting furnace 2, the current temperature of the melting furnace 2 is measured again by the temperature sensor for a predetermined time. Here, 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 drum 1 is advanced a certain distance in the melting furnace 2 by performing step S25, the current temperature of the melting furnace 2 is measured again by the temperature sensor after 10 minutes.
After step S26, the flow returns to step S22, and the processes of S22 to S26 are re-executed until the current temperature of the melting furnace 2 falls within the predetermined temperature range (1099.5 ℃ to 1100.5 ℃).
In embodiment 2, the difference from embodiment 1 is mainly that step S1 of embodiment 1 (creation of a database of 3 of the ladle position, the furnace temperature, and the ladle moving distance) is omitted, and in step S24, the distance that the ladle 1 needs to be moved forward or backward in the furnace 2 in order to reach the furnace temperature to the predetermined temperature range is obtained by PID control, instead of obtaining the distance that the ladle 1 needs to be moved forward or backward in the furnace 2 by referring to the database as in embodiment 1. Steps S21, S22, S23, S25, and S26 in embodiment 2 are substantially the same as steps S2, S3, S4, S6, and S7 in embodiment 1.
According to the temperature control method of embodiment 2, the temperature in the melting furnace can be precisely controlled, and the cooling of the molten glass can be made uniform, the uniformity of the glass thickness can be increased, and the bubble rate in the glass can be reduced.
The temperature control method of the melting furnaces according to embodiments 1 and 2 of the present invention is described above. However, it is obvious that embodiments 1 and 2 are only preferred embodiments of the method for controlling the temperature of the melting furnace according to the present invention, and the present invention is not limited thereto. Those skilled in the art can also change embodiments 1 and 2, and the changed embodiments are also included in the present disclosure.
For example, in embodiment 1, step S4 of obtaining the current position of the water drum 1 is performed between step S3 and step S5, but the present position of the water drum 1 may be obtained between step S1 and step S2 or between step S2 and step S3 without being limited thereto. In embodiment 2, step S23 of obtaining the current position of the water drum 1 is performed between step S22 and step S24, but the present position of the water drum 1 may be obtained before step S21 or between step S21 and step S22.
In embodiments 1 and 2, the melting furnace is cooled by using one water drum. However, the present invention is not limited to this, and a plurality of (two or three or more) water bags may be provided in parallel on the same horizontal plane, and the melting furnace may be cooled by a plurality of water bags connected in series or in parallel.
In embodiments 1 and 2, the water drum advances and retreats along the cross member. However, the present invention is not limited thereto, and the water bag may be mounted on a water bag vehicle having rollers, and the water bag may be moved by moving the water bag vehicle.
Claims (5)
1. A method of controlling the temperature of a float glass furnace, comprising:
a melting furnace temperature obtaining step: acquiring the temperature of a melting furnace;
the water drum position obtaining step: obtaining the current position of the water bag in the melting furnace;
the water drum advancing and retreating distance obtaining step: according to each melting furnace temperature, acquiring a distance required for advancing or retreating a water drum in the melting furnace in order to enable the melting furnace temperature to reach a set melting furnace first temperature; and
the water drum advancing and retreating step: comparing the obtained furnace temperature with the first temperature, and advancing the water drum from the current position by the distance in the case that the furnace temperature is higher than the first temperature; in the event that the furnace temperature is below the first temperature, causing the water drum to retract from the current position the distance,
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, the size, the cooling medium type and the material of the water drum and the shape, the size and the temperature of the melting furnace, the current position of the water drum, the temperature of each melting furnace and the obtained advancing and retreating distance of the water drum corresponding to the temperature of each melting furnace are mutually related to form a database,
in the step of acquiring the water drum advancing and retreating distance, the water drum advancing and retreating distance corresponding to the current position of the water drum and the acquired melting furnace temperature is searched from a database and is used as the distance for advancing or retreating the water drum in the melting furnace.
2. The temperature control method according to claim 1, wherein:
the current position of the water drum is obtained by a position sensor arranged on the water drum, or by calculating the moving distance of the water drum, or by shooting with a camera arranged in the melting furnace.
3. A temperature control method according to claim 1 or 2, characterized in that:
the melting furnace temperature is the temperature of a glass liquid runner of the melting furnace.
4. A temperature control method according to claim 1 or 2, characterized in that:
the water drum is a pipe which is formed by bending a pipe material into a U shape, the front end of the closed end of the U shape faces the melting furnace, and the two ends of the U shape, which are open, are respectively provided with a water inlet and a water outlet.
5. The temperature control method according to claim 4, wherein:
the water drum drives the water drum 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 advance or retreat in the melting furnace; the cross beam is fixed outside the melting furnace; and a hanging part which can move along the cross beam under the drive of the motor, the rear end of the U-shaped opening of the water drum is fixed and hung on the hanging 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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