A process for increasing the color change speed of float glass

Abstract

The application relates to the technical field of glass color changing, and discloses a process for improving the color changing speed of float glass, which adopts an excess color changing method to change the color of glass and comprises the following steps: S1, providing a glass tank furnace, the glass tank furnace comprises a feeding port, a feeding port area, a hot spot area, a melting part, a neck, and a cooling part which are sequentially arranged, the bottom of the glass tank furnace is provided with an electric melting assisting system and a bubble, the molybdenum electrode is located in the feeding port area and the hot spot area, and the bubble is located in the hot spot area; S2, providing excess color materials, the color materials are injected into the feeding port area through the feeding port, so that the color materials are continuously mixed with colorless glass base materials to form a mixture, the mixture is heated and melted in the melting part to form glass liquid, and the glass liquid passes through the neck and flows to the cooling part for cooling. The color changing process provided by the application can effectively shorten the color changing period, reduce the color changing energy consumption, reduce the number of glass waste products in the color changing process, thereby reducing the production cost and improving the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass color changing, in particular to a process for improving the color changing speed of float glass. BACKGROUND

[0002] In the production of float glass, the color changing cost of large glass tank furnace is high, and several hundred thousand yuan may be lost in a day of color changing. At present, the excess color changing method is often used to shorten the color changing period, that is, a colorant higher or lower than the target value is added to the batch material. However, this method has many problems. In the color changing process, the melting, refining and homogenizing of the melting part are difficult, and the temperature of the cooling part is also reduced.

[0003] In view of the low temperature of the cooling part, the manufacturer usually adjusts the depth of the neck water bag to increase the temperature. For the problem of the melting part, the glass tank furnace gas volume is increased to increase the melting temperature, and the bubbling flow is increased to strengthen the material feeding reflux. However, the increase of the bubbling flow will cause the temperature of the glass liquid in the cooling part to decrease, resulting in a long color changing process period, high energy consumption of the color changing method, and a large amount of glass waste during the color changing period. SUMMARY

[0004] To solve the technical problems in the background art, the present application provides a process for improving the color changing speed of float glass.

[0005] The process for improving the color changing speed of float glass provided by the present application uses the excess color changing method to change the color of the glass, which includes the following steps:

[0006] S1 provides a glass tank furnace, which includes a feeding port, a feeding port area, a hot spot area, a melting part, a neck, and a cooling part arranged in sequence. The bottom of the glass tank furnace is provided with an electric melting system and a bubbling. The molybdenum electrode is located in the feeding port area and the hot spot area, and the bubbling is located in the hot spot area.

[0007] S2 provides excess colorant. The colorant is injected into the feeding port area through the feeding port, so that the colorant and the colorless glass base material are continuously mixed to form a batch material. The batch material is heated and melted in the melting part to form a glass liquid. The glass liquid passes through the neck and flows to the cooling part for cooling.

[0008] S3 increases the total daily gas consumption of the glass tank furnace before the start of excess feeding.

[0009] S4 synchronously loads the maximum value of the total power of the bubbling and the electric melting system at the start of excess feeding.

[0010] As a further optimized scheme of the present application, the electric melting system uses a molybdenum electrode, and the molybdenum electrode is loaded with power once during the color changing period of the float glass. The loading power of the molybdenum electrode located in the feeding port area is 30%-40%, and the loading power of the molybdenum electrode located in the hot spot area is 60%-70%.

[0011] As a further optimized scheme of the present application, the feeding port area and the hot spot area are both provided with two rows of molybdenum electrodes, each row of molybdenum electrodes in the feeding port area is loaded with a power of 15%-20%, and each row of molybdenum electrodes in the hot spot area is loaded with a power of 30%-35%.

[0012] As a further optimized scheme of the present application, the glass tank furnace is provided with a plurality of temperature measuring points on the tank bottom.

[0013] As a further optimized scheme of the present application, the number of the temperature measuring points is ten, and the ten temperature measuring points are uniformly distributed along the center line direction of the tank bottom of the glass tank furnace.

[0014] As a further optimized scheme of the present application, the bubble is a double-row water-cooled bubble.

[0015] As a further optimized scheme of the present application, the glass tank furnace further comprises an arch top, a right side wall, a rear gable, a left side wall and a front face wall, the rear gable is opposite to the front face wall, the front face wall is arranged away from the neck, the feeding port is arranged in the middle of the front face wall, and the number of the feeding ports is two and the feeding ports are horizontally symmetrically distributed.

[0016] As a further optimized scheme of the present application, the glass tank furnace further comprises a plurality of pairs of small furnaces, the plurality of pairs of small furnaces are symmetrically arranged on the right side wall and the left side wall, and the flame space is formed by burning the plurality of pairs of small furnaces on the upper portion of the inner cavity of the glass tank furnace.

[0017] The process for improving the color changing speed of float glass provided by the present application has the following beneficial effects:

[0018] By simultaneously installing the electric melting assisting system and the water-cooled bubble in the glass tank furnace, the total daily consumption of fuel gas of the glass tank furnace is increased before the start of overfeeding, and the total power of the bubble and the electric melting assisting system is synchronously loaded with the maximum value at the start of overfeeding. The color changing process has achieved remarkable effects in color changing experiments of glass tank furnaces of different sizes, effectively shortens the color changing period, reduces the color changing energy consumption, and reduces the number of glass waste products in the color changing process, thereby reducing the production cost and improving the production efficiency.

[0019] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a schematic diagram of the front view cross-sectional structure of the glass tank furnace in Example 1 provided by the present application;

[0021] Figure 2 FIG. 2 is a schematic diagram of the top view cross-sectional structure of the glass tank furnace in Example 1 provided by the present application;

[0022] Figure 3 Fig. 2 is a schematic diagram of a front view of a cross-sectional structure of the glass tank furnace provided in Example 2 of the present application;

[0023] Figure 4 Fig. 3 is a schematic diagram of a top view of a cross-sectional structure of the glass tank furnace provided in Example 2 of the present application;

[0024] Figure 5 Fig. 4 is a schematic diagram of a front view of a cross-sectional structure of the glass tank furnace provided in Example 3 of the present application;

[0025] Figure 6 Fig. 5 is a schematic diagram of a top view of a cross-sectional structure of the glass tank furnace provided in Example 3 of the present application.

[0026] BRIEF DESCRIPTION OF DRAWINGS 1, molybdenum electrode; 2, water-cooled bubbling; 3, tank bottom; 4, glass liquid material pile in melting part; 5, melting part; 6, neck; 7, cooling part; 8, small furnace; 9, dome top; 10, right side wall; 11, back gable; 12, left side wall; 13, front face wall; 14, feeding port; 15, temperature measuring point. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described in detail below with reference to the attached drawings, which are meant to be exemplary and not limiting, and in which like or similar symbols refer to like or similar elements throughout the various figures. The embodiments described below are examples of embodiments of the present application, which are not to be construed as limiting the present application.

[0028] It needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] A process for improving the color changing speed of float glass, which uses an excess color changing method to change the color of glass, comprising the following steps:

[0030] S1 provides a glass tank furnace, which comprises a feeding port, a feeding port area, a hot spot area, a melting part, a neck, and a cooling part arranged in sequence, and the tank bottom of the glass tank furnace is provided with an electric melting aid system and a bubbling, the molybdenum electrode is located in the feeding port area and the hot spot area, and the bubbling is located in the hot spot area;

[0031] S2 provides excess colorant, which is injected into the feeding port area through the feeding port, so that the colorant is continuously mixed with the colorless glass batch to form a batch, the batch is heated and melted in the melting section to form a glass liquid, and the glass liquid passes through the neck and flows to the cooling section for cooling;

[0032] S3 increases the total gas consumption of the glass tank furnace before the start of the excess feeding;

[0033] S4 synchronously loads the maximum value of the total power of the bubbling and electric melting system at the start of the excess feeding.

[0034] Specifically, the electric melting system uses molybdenum electrodes, and the molybdenum electrodes are loaded with power once during the color change of the float glass, the molybdenum electrodes in the feeding port area are loaded with power of 30%-40%, and the molybdenum electrodes in the hot spot area are loaded with power of 60%-70%.

[0035] Specifically, the feeding port area and the hot spot area each have two rows of molybdenum electrodes, each row of molybdenum electrodes in the feeding port area is loaded with power of 15%-20%, and each row of molybdenum electrodes in the hot spot area is loaded with power of 30%-35%.

[0036] Specifically, the bottom of the glass tank furnace is provided with a plurality of temperature measuring points.

[0037] Further, the number of temperature measuring points is ten, and the ten temperature measuring points are uniformly distributed along the center line direction of the bottom of the glass tank furnace.

[0038] Specifically, the bubbling is a double-row water-cooled bubbling.

[0039] Specifically, the glass tank furnace further comprises an arch top, a right side wall, a rear gable, a left side wall and a front wall, the rear gable is opposite to the front wall, and the front wall is arranged away from the neck, the feeding port is arranged in the middle of the front wall, and the number of the feeding ports is two and is horizontally symmetrically distributed.

[0040] Specifically, the glass tank furnace further comprises a plurality of pairs of small furnaces, the plurality of pairs of small furnaces are symmetrically arranged on the right side wall and the left side wall, and the plurality of pairs of small furnaces are arranged to form a flame space by burning in the upper part of the inner cavity of the glass tank furnace.

[0041] Embodiment one

[0042] On the basis of excess color change, the black glass is changed to ordinary white glass by combining the electric melting system and the bubbling, and the specific method is as follows:

[0043] Among them, the black glass contains the following components and mass percentages: quartz sandstone powder 39.3%, soda ash 10.4%, limestone 6.5%, feldspar 3.9%, dolomite 10.1%, cullet 20%, mirabilite 2%, carbon powder 0.5%, and iron oxide 2.9%;

[0044] Common white glass contains the following ingredients and their mass percentages: quartz sandstone powder 46.9%, soda ash 11.5%, limestone 7.1%, feldspar 6.1%, dolomite 10.8%, cullet 15%, mirabilite 3%, carbon powder 0.5%, iron oxide 0.02%;

[0045] As shown in Figure 1 and Figure 2 , a process for improving the color changing speed of float glass, a 260t / d glass tank furnace is selected, the glass tank furnace includes four rows of molybdenum electrodes 1, a water-cooled bubbling 2, a tank bottom 3, a melting part 5, a neck 6, a cooling part 7, the four rows of molybdenum electrodes 1 are arranged in two groups in the material feeding port area and the hot spot area respectively, the water-cooled bubbling 2 is arranged at the melting part 5, the melting part 5 has a glass liquid surface material pile 4, the upper part of the glass tank furnace is symmetrically distributed by five pairs of small furnaces 8 on the left and right sides of the glass tank furnace and the combustion forms a flame space, the top of the glass tank furnace is a dome top 9, the wall surface of the glass tank furnace includes a right side wall 10, a front wall 13, a left side wall 12, and a rear gable wall 11, the front wall 13 has two material feeding ports 14, and 10 (①-⑩) temperature measuring points 15 are arranged along the center line direction of the tank bottom;

[0046] Before the start of overfeeding, the total gas consumption of the glass tank furnace is increased by 5% per day;

[0047] The double-row water-cooled bubbling 2 is loaded with the maximum value of 17L / min at the same time when overfeeding starts;

[0048] The total power of the molybdenum electrodes 1 of the electric melting assisting system is loaded to the planned maximum value at the same time when overfeeding starts, and in the color changing process of the 260t / d glass tank furnace, the power loading distribution ratio and value in the material feeding port area and the hot spot area are as follows:

[0049] Zone Feed zone Hot spot zone Percentage (%) 35.9 64.1 Power (kW) 280 500

[0050] In this embodiment, the power distribution ratio corresponding to the power loading of the four rows of molybdenum electrodes 1 is as follows:

[0051] Zone 1 2 3 4 Percentage (%) 17.95 17.95 32.05 32.05 Power (kW) 140 140 250 250

[0052] The instant temperature distribution of each temperature measuring point of the glass tank furnace before color changing, after color changing without electric melting assisting, and after color changing with electric melting assisting is shown in the following table:

[0053] Temperature measuring point Before color change Without electric fluxing after color change With electric fluxing after color change ① 986.8 1037.6 1050.5 ② 982.5 1042.6 1055.3 ③ 994.9 1043.6 1056.9 ④ 991.7 1054.9 1060.2 ⑤ 1000.5 1061.4 1071.4 ⑥ 1005.1 1058.9 1065.6 ⑦ 984.5 1047.1 1053.1 ⑧ 977.4 1045.3 1049.4 ⑨ 881.4 990.4 995.3 ⑩ 867.4 985.6 987.6

[0054] After the color changing is completed, the electric melting assisting system is turned off, the bubbling flow is reduced, and normal production is resumed;

[0055] Before the electric melting aid system is put into use, the period of changing black glass to white glass in the glass tank furnace of the embodiment is about 15 days, and after the electric melting aid system is put into use, the period of changing black glass to white glass in the glass tank furnace of the embodiment is about 10 days, 5 days of time is saved;

[0056] The experimental results show that the color changing period is significantly shortened after the electric melting aid system is installed.

[0057] Embodiment two

[0058] On the basis of excessive color changing, the gray glass is changed to black glass by combining the electric melting aid system and bubbling, and the specific method is as follows:

[0059] The gray glass contains the following components and mass percentages: quartz sandstone powder 35.3%, soda ash 10.2%, limestone 5.8%, feldspar 3.9%, dolomite 8.1%, cullet 30%, mirabilite 2%, carbon powder 0.5%, iron sulfide 1.0%, cobalt oxide 1.5%, and cuprous oxide 0.04%;

[0060] The black glass contains the following components and mass percentages: quartz sandstone powder 40.1%, soda ash 11.5%, limestone 8.2%, feldspar 4.6%, dolomite 8.8%, cullet 30%, mirabilite 2%, carbon powder 0.5%, and iron oxide 3.0%;

[0061] As shown in Figure 1 and Figure 2 A process for improving the color changing speed of float glass, a 600t / d glass tank furnace is selected, the inside of the glass tank furnace includes four rows of molybdenum electrodes 1, a water-cooled bubbling device 2, a tank bottom 3, a melting part 5, a neck 6, and a cooling part 7, the four rows of molybdenum electrodes 1 are arranged in two groups in the feeding port area and the hot spot area, the water-cooled bubbling device 2 is arranged at the melting part 5, the melting part 5 has a glass liquid surface material pile 4, the upper part of the glass tank furnace is symmetrically distributed by six pairs of small furnaces 8 on the left and right sides of the glass tank furnace and burns to form a flame space, the top of the glass tank furnace is a crown top 9, the wall surface of the glass tank furnace includes a right side wall 10, a front wall 13, a left side wall 12, and a rear gable wall 11, the front wall 13 has two feeding ports 14, and 10 (①-⑩) temperature measuring points 15 are arranged along the center line direction of the tank bottom;

[0062] Before the excessive feeding starts, the total gas consumption of the glass tank furnace is increased by 3% per day;

[0063] The double-row water-cooled bubbling device 2 is loaded with a maximum value of 20L / min at the same time when the excessive feeding starts;

[0064] The total power of the molybdenum electrodes 1 of the electric melting aid system is loaded to the planned maximum value at the same time when the excessive feeding starts, and in the color changing process of the 600t / d glass tank furnace, the power loading distribution ratio and value in the feeding port area and the hot spot area are as follows:

[0065] Zone Feed zone Hot spot zone Percentage (%) 35 65 Power (kW) 600 1100

[0066] In this embodiment, the power distribution corresponding to the four rows of molybdenum electrodes 1 after loading power is as follows:

[0067] Zone 1 2 3 4 Percentage (%) 17.5 17.5 32.5 32.5 Power (kW) 300 300 550 550

[0068] The instant temperature distribution of each temperature measuring point on the bottom of the glass tank furnace before color change, after color change without electric melting, and after color change with electric melting of this embodiment is shown in the following table:

[0069] Temperature measuring point Before color change Without electric fluxing after color change With electric fluxing after color change ① 949.1 955.2 960.4 ② 952.4 960.1 965.7 ③ 957.1 962.4 970.1 ④ 959.3 966.1 974.5 ⑤ 969.5 973.1 980.4 ⑥ 975.4 980.4 985.6 ⑦ 970.8 975.3 980.1 ⑧ 874.1 860.1 867.9 ⑨ 863.7 850.6 854.1 ⑩ 893.2 877.4 886.7

[0070] After the color change is completed, the electric melting system is turned off, the bubbling flow is reduced, and normal production is resumed.

[0071] Before the electric melting system is installed, the period for changing the color of the glass from gray to black in the glass tank furnace of this embodiment is about 100 hours. After the electric melting system is installed, the period for changing the color of the glass from gray to black in the glass tank furnace of this embodiment is about 50 hours, saving 50 hours of time.

[0072] The experimental results show that the color change period is significantly shortened after the electric melting system is installed.

[0073] Embodiment Three

[0074] On the basis of excessive color change, the gray glass is changed to ordinary white glass by combining the electric melting system and bubbling, as follows:

[0075] The gray glass contains the following components and mass percentages: quartz sandstone powder 43.1%, soda ash 10.2%, limestone 7.8%, feldspar 4.6%, dolomite 8.1%, cullet 15%, salt cake 2%, carbon powder 0.5%, iron sulfide 1.0%, cobalt oxide 2.0%, and cuprous oxide 0.04%.

[0076] The ordinary white glass contains the following components and mass percentages: quartz sandstone powder 45.1%, soda ash 11.5%, limestone 8.2%, feldspar 4.6%, dolomite 8.8%, cullet 15%, salt cake 2%, carbon powder 0.5%, and iron oxide 1.0%.

[0077] For example, Figure 1 and Figure 2As shown, a process for improving the color changing speed of float glass, a 1000t / d glass tank furnace is selected, the inside of the glass tank furnace includes four rows of molybdenum electrodes 1, a water-cooled bubble 2, a tank bottom 3, a melting part 5, a neck 6, a cooling part 7, the four rows of molybdenum electrodes 1 are divided into two groups and are arranged in the feeding port area and the hot spot area respectively, the water-cooled bubble 2 is arranged at the melting part 5, the melting part 5 has a glass liquid surface material pile 4, the upper part of the glass tank furnace is symmetrically distributed by eight pairs of small furnaces 8 on the left and right sides of the glass tank furnace and the combustion forms a flame space, the top of the glass tank furnace is a dome top 9, the wall surface of the glass tank furnace includes a right side wall 10, a front wall 13, a left side wall 12 and a rear gable wall 11, the front wall 13 has two feeding ports 14, and 10 (①-⑩) temperature measuring points 15 are arranged along the center line direction of the tank bottom;

[0078] Before the start of overfeeding, the total daily gas consumption of the glass tank furnace is increased by 7%;

[0079] The double-row water-cooled bubble 2 is loaded with a maximum value of 30L / min at the start of overfeeding;

[0080] The total power of the molybdenum electrodes 1 of the electric melting system is loaded to the planned maximum value at the start of overfeeding, and in the color changing process of the 1000t / d glass tank furnace, the power loading distribution ratio and value in the feeding port area and the hot spot area are as follows:

[0081] Zone Feed zone Hot spot zone Percentage (%) 38 62 Power (kW) 570 930

[0082] In this embodiment, the power distribution ratio corresponding to the power loading of the four rows of molybdenum electrodes 1 is as follows:

[0083] Zone 1 2 3 4 Percentage (%) 19 19 31 31 Power (kW) 285 285 465 465

[0084] The instant temperature distribution of each temperature measuring point of the glass tank furnace of this embodiment before color changing, after color changing without electric melting and after color changing with electric melting is shown in the following table:

[0085] Temperature measuring point Before color change Without electric fluxing after color change With electric fluxing after color change ① 993 1054.1 1055.4 ② 989.1 1040.2 1042.7 ③ 992.2 1051.2 1053.6 ④ 1014.1 1070.4 1073.1 ⑤ 1012.3 1067.8 1069.8 ⑥ 1013.7 1069.4 1070.3 ⑦ 1083.4 1140.7 1142.7 ⑧ 1113.6 1161.1 1164.7 ⑨ 892.3 937.1 949.4 ⑩ 877.1 910.4 938.9

[0086] After the color changing is completed, the electric melting system is turned off, the bubble flow is reduced, and normal production is resumed;

[0087] Before the electric melting system is installed, the period for changing gray glass to white glass of the glass tank furnace of this embodiment is about 10 days, and after the electric melting system is installed, the period for changing gray glass to white glass of the glass tank furnace of this embodiment is about 6 days, which saves 4 days of time;

[0088] The experimental results show that the color changing period is significantly shortened after the electric melting system is installed.

[0089] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A process for increasing the colour change speed of float glass, the glass is subjected to colour change by using excess colour change method, characterised in that, The method comprises the following steps: S1, providing a glass tank furnace, which comprises a feeding port, a feeding port area, a hot spot area, a melting part, a neck, and a cooling part arranged in sequence, wherein the tank bottom of the glass tank furnace is provided with an electric melting aid system and a bubble, the electric melting aid system adopts molybdenum electrodes, the molybdenum electrodes are located in the feeding port area and the hot spot area, the bubble is a double-row water-cooled bubble, and the bubble is located in the hot spot area; S2, providing an excess amount of colorant, which is injected into the feeding port area through the feeding port, so that the colorant is continuously mixed with the colorless glass base material to form a batch material, the batch material is heated and melted in the melting part to form a glass liquid, the glass liquid passes through the neck and flows to the cooling part for cooling; S3, before the start of overfeeding, increasing the total daily gas consumption of the glass tank furnace, wherein the total daily gas consumption is increased by 3%-7% relative to normal production; S4, at the start of overfeeding, synchronously loading the maximum value of the total power of the bubble and the electric melting aid system, wherein the loading power of the molybdenum electrode located in the feeding port area is 30%-40% of the total power of the electric melting aid system, and the loading power of the molybdenum electrode located in the hot spot area is 60%-70% of the total power of the electric melting aid system.

2. A process for increasing the colour change speed of float glass as claimed in claim 1 wherein, The molybdenum electrode is loaded with power once during the color changing of the float glass.

3. A process for increasing the colour change speed of float glass as claimed in claim 2 wherein, The feeding port area and the hot spot area each have two rows of molybdenum electrodes, each row of molybdenum electrodes located in the feeding port area has a loading power of 15%-20%, and each row of molybdenum electrodes located in the hot spot area has a loading power of 30%-35%.

4. A process for increasing the colour change speed of float glass as claimed in claim 1 wherein, The tank bottom of the glass tank furnace is provided with a plurality of temperature measuring points.

5. A process for increasing the colour change speed of float glass as claimed in claim 4 wherein, The number of temperature measuring points is ten, and the ten temperature measuring points are uniformly distributed along the center line direction of the tank bottom of the glass tank furnace.

6. A process to increase the colour change speed of float glass as claimed in claim 1 wherein, The glass tank furnace further comprises a dome top, a right side wall, a rear gable wall, a left side wall, and a front face wall, the rear gable wall is opposite to the front face wall, the front face wall is arranged away from the neck, the feeding port is arranged in the middle of the front face wall, and the number of feeding ports is two and is horizontally symmetrically distributed.

7. A process for increasing the colour change speed of float glass as claimed in claim 6 wherein, The glass tank furnace further comprises a plurality of pairs of small furnaces, the plurality of pairs of small furnaces are symmetrically arranged on the right side wall and the left side wall, and the plurality of pairs of small furnaces are arranged to form a flame space by burning in the upper part of the inner cavity of the glass tank furnace.

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