Double-row bubbler for glass kiln melting section and control method thereof

Abstract

The application discloses a kind of glass kiln material preparation department double-row bubble maker and control method thereof, downstream of two 3# small furnaces is installed between and located at the downstream of 3# small furnace burner along the front row bubble maker, downstream bubble maker is installed between two 4# small furnaces and is located at the downstream of 4# small furnace burner, front row drum package and downstream drum package carry out intermittent lowering and lifting action at glass kiln material preparation department, so that the temperature of glass kiln material preparation department pool bottom is 1026-1037 DEG C, the flow of each bubble tube of front row bubble maker is 2.8-3.2 L / M, and the pressure is 0.02 MPa;The flow of each bubble tube of downstream bubble maker is 4.8-5.2 L / M, and the pressure is 0.05 MPa.The application further improves the shape of material pile in the melting furnace and the material preparation state, improves the stability of material pile, prevents material pile from deviating, stabilizes bubble boundary line, and the melting quality of glass liquid is more stable;Make the average heat consumption of melting furnace reduce by 2.5%, while the top temperature of melting part is reduced, which is beneficial to reduce the erosion of refractory material.

Description

Technical Field

[0001] This invention relates to the field of glass furnace technology, and in particular to a double-row bubbler in the chemical processing section of a glass furnace and its control method. Background Technology

[0002] The bubbling process in float glass melting furnaces is an energy-saving, consumption-reducing, and product-quality-improving technique used in glass melting. It is widely used due to its economic, safe, and easy-to-operate nature. In float glass production, clean gas at a certain pressure is bubbled upwards from the bottom of the melting furnace, causing artificially formed bubbles to rise and agitate the molten glass, thereby promoting homogenization and increasing the output. Currently, as a modern technology for high-efficiency and energy-saving melting furnaces, the bubbling process is particularly effective in the production of colored glass.

[0003] Typically, during the use of bubblers, due to the varying sizes of the internal spaces within float glass melting furnaces and the influence of other factors on the furnace atmosphere, float glass manufacturers install and use bubblers according to the internal spatial structure of their furnaces. The sole purpose of using bubblers is to homogenize and clarify the molten glass, thereby reducing color differences in the glass products. Therefore, in existing technologies, the bubbling process in float glass achieves clarification and homogenization of the molten glass through the stirring action of the bubbler. Patent application number CN201610164605.3, entitled "A Bubbling Melting Method in Float Glass Production," discloses a double-row bubbler bubbling melting method. This method can reduce the temperature of the melting section's arch and breast wall, decrease the lateral temperature difference, extend the furnace's service life, and effectively utilize the temperature of the internal flame space, avoiding fuel waste and thus achieving energy savings and reduced product costs.

[0004] However, the double-row bubbling tubes in the aforementioned invention have fixed positions, and both sets of bubblers are specifically positioned 3.1–5.5 mm downstream of the bubble boundary line and 2.8–4.5 m away from the material pile, avoiding the outlet of the combustion air in the melting section to prevent affecting the internal temperature circulation system of the furnace. This method only bubblees the glass melt 3.1–5.5 mm downstream of the bubble boundary line and beyond. Bubbling cools and convections the glass melt, but it does not enhance the backflow from the hot spot to the feeding section. The temperature difference between the refining zone and the melting section, and between the refining zone and the hot spot, is significant. On one hand, this results in a high required flame temperature for the furnace, low furnace heat utilization, and excessive fuel consumption. On the other hand, because the longitudinal and transverse convection at the bottom of the deep pool of the glass melt is weak, the glass melt backflow capacity is low, and the temperature difference at the bottom of the pool is too large, ultimately affecting product quality. Summary of the Invention

[0005] The purpose of this invention is to provide a double-row bubbler in the material processing section of a glass furnace and its control method, so as to solve the problems of poor reflux capacity from hot spot to feeding in glass furnace, large temperature difference between the clarification zone and the material processing section, and large temperature difference between the clarification zone and the hot spot.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A double-row bubbler for the melting section of a glass furnace includes a glass furnace with six pairs of small furnaces in its melting section. The double-row bubbler consists of a front row of bubblers and a rear row of bubblers, positioned along the flow direction of the molten glass within the glass furnace. The front row of bubblers is installed between two No. 3 small furnaces in the melting section of the glass furnace and downstream of the No. 3 small furnace burners. The rear row of bubblers is installed between two No. 4 small furnaces in the melting section of the glass furnace and downstream of the No. 4 small furnace burners. The front row of bubblers consists of 10 bubble tubes symmetrically distributed along the longitudinal centerline of the glass furnace, with a spacing of 1000 mm between each of the 10 bubble tubes. The rear row of bubblers consists of 21 bubble tubes symmetrically distributed along the longitudinal centerline of the glass furnace, with a spacing of 565 mm between each of the 21 bubble tubes.

[0008] A method for controlling double-row bubblers in the melting section of a glass furnace, wherein the front and rear rows of bubblers intermittently retract and lift in the melting section of the glass furnace, so that the temperature at the bottom of the melting section is 1026-1037℃; the flow rate of each bubble tube in the front row of bubblers is 2.8-3.2 L / m and the pressure is 0.02 MPa; the flow rate of each bubble tube in the rear row of bubblers is 4.8-5.2 L / m and the pressure is 0.05 MPa.

[0009] A further technical solution is that the flow rate of each bubbling tube of the front bubbling device is 3L / M.

[0010] A further technical solution is that the pressure of each bubbling tube of the front bubbling device is 0.02 MPa.

[0011] A further technical solution is that the flow rate of each bubbling tube of the rear bubbling device is 5L / M.

[0012] A further technical solution is that the pressure of each bubbling tube of the rear bubbling device is 0.05 MPa.

[0013] A further technical solution is that the front-row bubbler undergoes at least two downward and upward movements during use, with a total downward or upward movement of 100mm, and the insertion depth within the glass furnace varies from 650mm to 750mm.

[0014] A further technical solution is that the rear bubbler undergoes at least two downward and upward movements during use, with a total downward or upward movement of 100mm, and the insertion depth within the glass furnace varies from 850mm to 950mm.

[0015] A further technical solution is as follows: the inlet water temperature of the front aerator and the rear aerator is 35±2℃, the return water temperature of the front aerator is 45℃±2℃, and the return water temperature of the rear aerator is 44℃±2℃.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] 1. The use of bubblers can accelerate the convection of molten glass, extend the clarification time of molten glass, improve the homogenization quality of glass, and reduce the heat consumption of the melting furnace. The use of double-row bubblers greatly enhances the improvement of the above processes. Each row of bubblers is arranged in a straight line along the transverse side of the melting furnace. The gas entering the melting furnace through the double-row bubblers can form a double-layer gas curtain barrier. By adjusting the flow rate of the bubblers, the size of the gas curtain can be adjusted, thereby achieving the optimal state of the material in the furnace. By adjusting the flow rate of the bubblers, in conjunction with the distribution adjustment of the fuel in the small furnace, the stability of the material pile is improved, preventing the material pile from deviating, stabilizing the bubble boundary, and further improving the shape of the material pile and the melting state in the melting furnace. This also makes the melting quality of the molten glass in the melting section more stable.

[0018] 2. Bubblers are generally installed at the hot spots of the glass melting furnace, coinciding with the upward flow of molten glass inside the furnace. The installation of double-row bubblers further promotes the convection circulation of the molten glass, prolongs the residence time of the batch in the furnace, and accelerates the heat absorption process of the molten glass from the flame space. Simultaneously, the rising bubbles can agitate and disperse the viscous portion of the molten glass, accelerating its melting, reducing the number of small bubbles, and speeding up the removal of large bubbles. This improves the homogenization effect of the molten glass and enhances the quality of glass melting.

[0019] 3. Because the bubbling positions of the bubbler coincide with the upward flow of molten glass in the kiln, the rising bubbles carry the surrounding cool molten glass to areas with higher surface temperatures. This accelerates heat exchange between the surface and bottom layers of glass, increases the convection velocity of the molten glass, and increases the flow rate of molten glass returning from the hot spot to the feed inlet. This reduces the temperature of the furnace flame, saves fuel, and lowers energy consumption. At the same time, it lowers the temperature of the melting section's arch, which helps reduce refractory material erosion.

[0020] 4. The double-row bubbler enhances both longitudinal and transverse convection at the bottom of the deep glass pool. The stronger glass reflux reduces the temperature difference at the bottom of the pool and improves the glass melting efficiency. Under relatively stable drawing conditions, the use of the double-row bubbler enhances the feeding reflux, greatly reduces fuel consumption, and reduces furnace heat consumption, resulting in a 2.5% reduction in the average furnace heat consumption. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a double-row bubbler in the chemical processing section of a glass kiln according to the present invention.

[0022] Figure 2 For the present invention Figure 1 A schematic diagram of the structure of the central bubbling tube.

[0023] Figure 3 This is a graph showing the trend of the total number of defects in glass melting before and after using the double-row bubbler of the present invention.

[0024] Figure 4 This is a graph showing the trend of temperature difference at the bottom of the glass furnace before and after using the double-row bubbler of this invention.

[0025] Figure 5 This is a graph showing the temperature change trend of the bottom of the glass furnace before and after using the double-row bubbler of the present invention.

[0026] Figure 6 This is a graph showing the trend of natural gas consumption in each small furnace of the glass furnace before and after the use of the double-row bubbler of this invention.

[0027] Figure 7 This is a graph showing the trend of heat consumption changes in the glass furnace before and after using the double-row bubbler of this invention.

[0028] Attached reference numerals: 1. Glass kiln; 2. Front row of bulging device; 3. Rear row of bulging device. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Example 1:

[0036] This implementation example Figure 1 and Figure 2As shown, a double-row bubbler for the melting section of a glass furnace includes a glass furnace 1. The melting section of the glass furnace 1 is equipped with 6 pairs of small furnaces. The double-row bubbler consists of a front row bubbler 2 and a rear row bubbler 3, arranged along the flow direction of the molten glass within the glass furnace 1. The front row bubbler 2 is installed between two No. 3 small furnaces in the melting section of the glass furnace 1 and is located downstream of the No. 3 small furnace burner. The rear row bubbler 3 is installed between two No. 4 small furnaces in the melting section of the glass furnace 1 and is located downstream of the No. 4 small furnace burner. The front row bubbler 2 consists of 10 bubbler tubes symmetrically distributed along the longitudinal centerline of the glass furnace 1, with a spacing of 1000 mm between each of the 10 bubbler tubes. The rear row bubbler 3 consists of 21 bubbler tubes symmetrically distributed along the longitudinal centerline of the glass furnace 1, with a spacing of 565 mm between each of the 21 bubbler tubes. A method for controlling double-row bubblers in the melting section of a glass furnace, wherein the front row bubblers 2 and the rear row bubblers 3 intermittently retract and lift at the melting section of the glass furnace 1, so that the temperature at the bottom of the melting section of the glass furnace 1 is 1026-1037℃, the flow rate of each bubbler tube of the front row bubbler 2 is 2.8-3.2 L / M and the pressure is 0.02 MPa; the flow rate of each bubbler tube of the rear row bubbler 2 is 4.8-5.2 L / M and the pressure is 0.05 MPa.

[0037] Preferably, the flow rate of each bubbling tube of the front bubbling device 2 is 3L / M.

[0038] Preferably, the pressure of each bubbling tube of the front bubbling device 2 is 0.02 MPa.

[0039] Preferably, the flow rate of each bubble tube in the rear bubbler 3 is 5 L / M.

[0040] Preferably, the pressure of each bubbling tube of the rear bubbling device 3 is 0.05 MPa.

[0041] Preferably, the front-row bubbler 2 undergoes at least two downward and upward movements during use, with a total downward or upward movement of 100mm, resulting in an insertion depth variation of 650mm to 750mm within the glass furnace 1.

[0042] The first row of bubblers (rear row bubblers 3) was installed during the initial construction of the glass furnace 1, with a quantity of 21 units. The spacing between the bubblers is 565mm, and the installation location is in the No. 4 small furnace. The installation timeline of the second row of bubblers (front row bubblers 2) is shown in Table 1-1 below. The quantity is 10 units, the spacing between the bubblers is 1000mm, and the installation location is in the material processing area of ​​the No. 3 small furnace. They are symmetrically distributed along the longitudinal centerline of the melting furnace. The layout of the front row bubblers 2 and the rear row bubblers 3 is shown in the attached figure. Figure 1 As shown, they are numbered 1#-10# from right to left, and the initial penetration depth into the molten glass is 750mm.

[0043] Table 1-1 Bubble blower installation progress and parameters

[0044]

[0045] Each row of bubblers is arranged in a straight line along the transverse side of the melting furnace. The gas entering the melting furnace through the double rows of bubblers forms a double-layer gas curtain barrier. By adjusting the flow rate of the bubblers, the size of the gas curtain is adjusted, thereby optimizing the material shape inside the furnace. Adjusting the bubbler flow rate, in conjunction with adjusting the fuel distribution in the small furnace, improves the stability of the material pile, prevents pile deviation, stabilizes the bubble boundary, and further improves the shape and melting state of the material pile within the melting furnace. This also makes the melting quality of the molten glass in the melting section more stable. Specifically, this is mainly reflected in the following aspects:

[0046] 1. Accelerate clarification and improve quality

[0047] Bubblers are typically installed at the hot spots of a glass melting furnace, coinciding with the upward flow of molten glass. The installation of double-row bubblers further promotes the convection circulation of the molten glass, prolongs the residence time of the batch in the furnace, and accelerates the heat absorption process of the molten glass from the flame space. Simultaneously, the rising bubbles can agitate and disperse the viscous components in the molten glass, accelerating its melting, reducing the number of small bubbles, and speeding up the removal of large bubbles. This improves the homogenization of the molten glass and enhances the quality of glass melting.

[0048] By adding a second row of bubblers, the total number of defects in the molten glass showed a downward trend, with an average reduction of about 50 defects per hour. Compared with before the installation of the double-row bubblers, the average number of defects per hour decreased by about 30%. The reduction of small defects improved the homogenization quality of the glass, thereby improving the production quality of the product.

[0049] 2. Enhance convection and reduce energy consumption

[0050] As can be seen from the above-mentioned function 1, the upward flow of molten glass in the kiln coincides with the location of the bubbler. The rising bubbles carry the surrounding cool molten glass to the area with a higher surface temperature, accelerating the heat exchange between the surface and bottom layers of glass, increasing the convection velocity of the molten glass, increasing the flow rate of molten glass returning from the hot spot to the feed port, reducing the temperature of the furnace flame, saving fuel and reducing energy consumption, and at the same time reducing the temperature of the crown of the melting section, which is beneficial to reducing the erosion of refractory materials.

[0051] The use of double-row bubblers – intermittent lowering and raising movements are performed at the feed preparation section, and a certain amount of bubbling is provided according to the appropriate flow rate and air pressure. This causes the bottom temperature of the feed preparation section (T302), the second row of bubblers (T308), the hot spot (T309), and the clarification zone (T311) to rise to a certain extent. Among them, the bottom temperature of the clarification zone shows a stable upward trend. The temperature difference between the clarification zone and the feed preparation section (△T311-T302) and the temperature difference between the clarification zone and the hot spot (△T311-T309) are before the second row of bubblers are put into use. The temperature difference showed an upward trend, but after the bubblers were put into use, the temperature difference at that location showed a downward trend. The bottom temperature at the second row of bubblers (T308) increased by about 15°C, indicating that the double-row bubblers enhanced both the longitudinal and transverse convection of the deep bottom of the molten glass. The stronger reflux of the molten glass reduced the bottom temperature difference and improved the glass melting efficiency. Under the condition of relatively stable drawing volume, the use of double-row bubblers enhanced the feeding reflux, greatly reduced fuel consumption, and reduced the heat consumption of the melting furnace, resulting in a 2.5% reduction in the average heat consumption of the melting furnace.

[0052] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for controlling a double-row bubbler in the melting section of a glass furnace, comprising a glass furnace (1), wherein the melting section of the glass furnace (1) is provided with 6 pairs of small furnaces, characterized in that: The double-row bubbler consists of a front row bubbler (2) and a rear row bubbler (3). Along the flow direction of the molten glass in the glass furnace (1), the front row bubbler (2) is installed between two No. 3 small furnaces in the melting section of the glass furnace (1) and is located downstream of the No. 3 small furnace burner. The rear row bubbler (3) is installed between two No. 4 small furnaces in the melting section of the glass furnace (1) and is located downstream of the No. 4 small furnace burner. The front row bubbler (2) consists of 10 bubbler tubes symmetrically distributed along the longitudinal center line of the glass furnace (1), with a spacing of 1000 mm between each of the 10 bubbler tubes. The rear row bubbler (3) consists of 21 bubbler tubes symmetrically distributed along the longitudinal center line of the glass furnace (1), with a spacing of 565 mm between each of the 21 bubbler tubes. The control method of the double-row bubblers in the melting section of the glass furnace is as follows: the front row bubblers (2) and the rear row bubblers (3) perform intermittent lowering and raising actions at the melting section of the glass furnace (1), so that the temperature at the bottom of the melting section of the glass furnace (1) is 1026~1037℃, the flow rate of each bubble tube of the front row bubblers (2) is 2.8~3.2 L / M and the pressure is 0.02 MPa; the flow rate of each bubble tube of the rear row bubblers (3) is 4.8~5.2 L / M and the pressure is 0.05 MPa; The front row bubbler (2) is subjected to no less than two downward and upward movements during use, with a total downward or upward movement of 100 mm. The insertion depth in the glass furnace (1) varies from 650 mm to 750 mm. The rear bubbler (3) is subjected to at least two downward and upward movements during use, with a total downward or upward movement of 100 mm. The insertion depth in the glass furnace (1) varies from 850 mm to 950 mm.

2. The control method for a double-row bubbler in the material processing section of a glass furnace according to claim 1, characterized in that: The flow rate of each bubbling tube of the front row bubbling device (2) is 3 L / M.

3. The control method for a double-row bubbler in the material processing section of a glass furnace according to claim 1, characterized in that: The pressure of each bubbling tube of the front row bubbling device (2) is 0.02 MPa.

4. The control method for a double-row bubbler in the material processing section of a glass furnace according to claim 1, characterized in that: The flow rate of each bubble tube of the rear bubbler (3) is 5 L / M.

5. The control method for a double-row bubbler in the material processing section of a glass kiln according to claim 1, characterized in that: The pressure of each bubbling tube of the rear bubbling device (3) is 0.05 MPa.

6. The control method for a double-row bubbler in the material processing section of a glass furnace according to claim 1, characterized in that: The inlet water temperature of the front bubbler (2) and the rear bubbler (3) is 35±2℃, the return water temperature of the front bubbler (2) is 45℃±2℃, and the return water temperature of the rear bubbler (3) is 44℃±2℃.

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