Kiln wall structure capable of reducing solid phase defect of glass kiln

Abstract

The utility model discloses a kiln wall body structure capable of reducing the solid phase defect of a glass kiln, which comprises a melting part rear gable wall, a melting part left breast wall and a melting part right breast wall, air inlet pipes are arranged on the melting part left breast wall and the melting part right breast wall in a penetrating manner, and inlets of the air inlet pipes are connected with an air conveying device; and an outlet of the air inlet pipe faces the rear gable of the melting part and is used for directionally cooling the rear gable of the melting part. According to the utility model, the precipitation of refractory materials can be reduced, the temperature condition of the eutectic mixture formed by alkali steam and the refractory materials is changed, and the defects of stones, stripes and the like are reduced and even eliminated, so that the quality problem in production is solved.

Description

Technical Field

[0001] This application relates to the field of glass furnace technology, and in particular to a furnace wall structure that can reduce solid phase defects in glass furnaces. Background Technology

[0002] In the float glass manufacturing process, the melting furnace is a crucial core piece of equipment, and its operating status and performance directly determine the quality of the glass produced and the furnace's own lifespan. In the melting section of the furnace, the temperature reaches as high as 1580℃. Under such extreme high temperatures, a large amount of alkaline oxides in the glass volatilizes, producing alkaline vapors. These alkaline vapors condense in relatively cooler parts of the furnace, reacting chemically with the refractory materials to form eutectic compounds. These eutectic compounds continuously corrode the refractory materials, causing their structure and properties to gradually deteriorate, severely impacting the furnace's lifespan and increasing equipment maintenance costs and downtime for repairs.

[0003] More importantly, the alteration products generated during the erosion of refractory materials accumulate continuously over long production periods. Once the operating conditions of the melting furnace change, such as fluctuations in temperature and pressure, these alteration products can easily form defects such as stones or streaks in the glass. These defects severely affect the appearance quality and internal properties of the glass, reduce the product yield, increase production costs, and make it difficult to meet the market's demand for high-quality glass.

[0004] Currently, there are some technical solutions to problems related to glass melting furnaces. For example, the utility model patent CN221254412U, entitled "Structure of the Melting Section of a Glass Melting Furnace," improves glass quality to some extent by setting a guide platform on the rear wall of the molten pool and using a guide channel to direct impurities such as eutectic melt to a collection container, preventing them from flowing directly into the molten glass. However, this solution only diverts impurities and does not fundamentally solve the problem of alkali vapor eroding refractory materials and the resulting solid-phase defects.

[0005] For example, a utility model patent with patent number CN210419713U, entitled "A Structure of the Rear Wall of the Melting Section," reduces the concentration of alkali vapor by blowing air into the melting furnace through openings in the rear wall. However, in practical applications, this method has obvious drawbacks. Because the air blows directly into the furnace, it not only severely interferes with the heat flow distribution within the furnace and lowers the temperature of hot spots, leading to unstable temperatures in the hot spot areas and exacerbating the generation of solid-phase defects, but also causes other glass defects such as streaks and bubbles, thus negatively impacting the quality of glass production.

[0006] In summary, existing technical solutions cannot effectively solve a series of quality problems in float glass production, such as solid phase defects caused by alkali vapor erosion of refractory materials. Therefore, this invention proposes a furnace wall structure that can reduce solid phase defects in glass furnaces. Utility Model Content

[0007] This application provides a furnace wall structure that can reduce solid-phase defects in glass furnaces, thereby reducing refractory material precipitation and changing the temperature conditions at which alkali vapor and refractory materials form a low eutectic, thus reducing or even eliminating defects such as stones and streaks, thereby solving quality problems in production.

[0008] In view of this, this application provides a furnace wall structure that can reduce solid phase defects in glass furnaces, including: a rear wall of the melting section, a left breast wall of the melting section, and a right breast wall of the melting section;

[0009] An air inlet pipe is provided through both the left breast wall and the right breast wall of the melting section;

[0010] The inlet of the air intake pipe is connected to the air delivery device;

[0011] The outlet of the air inlet pipe is positioned towards the rear wall of the melting section, and is used to directionally cool the rear wall of the melting section.

[0012] Optionally, a measuring hole is provided on the arch of the rear wall of the melting section;

[0013] The measuring hole is equipped with a thermocouple measuring device for monitoring temperature changes and an alkaline vapor measuring device for monitoring alkaline vapor concentration changes.

[0014] Optionally, the thermocouple measuring device includes a type B thermocouple and an external corundum tube for protecting the type B thermocouple;

[0015] The type B thermocouple is used to measure the temperature at the location of the measuring hole and monitor temperature changes.

[0016] The external corundum tube is sleeved on the outside of the type B galvanometer to provide physical protection and chemical isolation for the type B galvanometer.

[0017] Optionally, the alkaline vapor measuring device includes a measuring body and a circulating water jacket disposed outside the measuring body;

[0018] The measuring body is used to measure the concentration of alkali vapor at the measuring hole location and monitor changes in the alkali vapor concentration;

[0019] The circulating water jacket is connected to an external circulating water system and is used to cool and protect the measuring body to prevent it from being burned out.

[0020] Optionally, the circulating water jacket includes a water jacket body and an inlet and an outlet disposed on the water jacket body;

[0021] The inlet and outlet are respectively connected to the water supply pipe and return pipe of the external circulating water system to form a circulating water loop.

[0022] Optionally, it may also include: a controller;

[0023] Both the thermocouple measuring device and the alkaline vapor measuring device are electrically connected to the controller.

[0024] The controller is electrically connected to the gas delivery device and is used to adjust the flow rate of the gas delivery device according to the temperature and alkali vapor concentration data collected by the thermocouple measuring device and the alkali vapor measuring device.

[0025] Optionally, the controller is a DCS system.

[0026] Optionally, the air inlet pipe is set at a 30-45° angle to the plane of the rear wall of the melting section;

[0027] The insertion depth of the intake pipe is 5~50mm.

[0028] Optionally, the air intake pipe can be detachably and symmetrically installed on the left breast wall and the right breast wall of the melting section.

[0029] Optionally, the intake pipe is made of 310S stainless steel.

[0030] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: The furnace wall structure that can reduce solid phase defects in glass furnaces has air inlet pipes installed through both the left breast wall and the right breast wall of the melting section, and the inlet of the air inlet pipes is connected to the gas conveying device. The outlet of the air inlet pipes is set towards the rear wall of the melting section, which can directionally cool the rear wall of the melting section, reduce the temperature of the rear wall of the melting section, and thus reduce the precipitation of refractory materials. By changing the temperature conditions for the formation of eutectic by alkali vapor and refractory materials, defects such as stones and streaks can be reduced or even eliminated, thereby solving quality problems in production. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the furnace wall structure that can reduce solid phase defects in glass furnaces in an embodiment of this application.

[0032] The attached figures are labeled as follows:

[0033] 1-Rear wall of the melting section, 2-Left breast wall of the melting section, 3-Right breast wall of the melting section, 4-Air inlet pipe, 11-Arch, 12-Measuring hole. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0035] In the description of this application, 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. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] This application provides an embodiment of a furnace wall structure capable of reducing solid phase defects in glass furnaces. Please refer to the following for details. Figure 1 .

[0038] The furnace wall structure in this embodiment that can reduce solid phase defects in glass furnaces includes: a rear wall 1 of the melting section, a left breast wall 2 of the melting section, and a right breast wall 3 of the melting section. An air inlet pipe 4 is provided through both the left breast wall 2 and the right breast wall 3 of the melting section. The inlet of the air inlet pipe 4 is connected to a gas conveying device, and the outlet of the air inlet pipe 4 is set towards the rear wall 1 of the melting section for directional cooling of the rear wall 1 of the melting section.

[0039] It should be noted that the furnace wall structure that can reduce solid phase defects in glass furnaces has air inlet pipes 4 installed through both the left breast wall 2 and the right breast wall 3 of the melting section. The inlet of the air inlet pipe 4 is connected to the gas supply device, and the outlet of the air inlet pipe 4 is set towards the rear wall 1 of the melting section. This allows for directional cooling of the rear wall 1 of the melting section, reducing its temperature and thus reducing the precipitation of refractory materials. By changing the temperature conditions at which alkali vapor and refractory materials form a low eutectic, defects such as stones and streaks can be reduced or even eliminated, thereby solving quality problems in production.

[0040] The above is Embodiment 1 of a furnace wall structure capable of reducing solid phase defects in glass furnaces, provided by this application. The following is Embodiment 2 of a furnace wall structure capable of reducing solid phase defects in glass furnaces, provided by this application. Please refer to the following for details. Figure 1 .

[0041] The furnace wall structure in this embodiment that can reduce solid phase defects in glass furnaces includes: a rear wall 1 of the melting section, a left breast wall 2 of the melting section, and a right breast wall 3 of the melting section. An air inlet pipe 4 is provided through both the left breast wall 2 and the right breast wall 3 of the melting section. The inlet of the air inlet pipe 4 is connected to the gas supply device through a pipe, and the outlet of the air inlet pipe 4 is set towards the rear wall 1 of the melting section for directional cooling of the rear wall 1 of the melting section.

[0042] It is understandable that by introducing non-reactive gases (oxygen, nitrogen, etc.) at a temperature not higher than that of the space at the rear wall 1 of the melting section through the gas supply device to directionally cool the rear wall 1 of the melting section, the concentration of alkali vapor in the alkali vapor accumulation area of ​​the melting furnace can be reduced, as can the temperature of the refractory material in the accumulation area and the reaction rate can be reduced.

[0043] A measuring hole 12 is provided on the arch 11 of the rear wall 1 of the melting section. A thermocouple measuring device for monitoring temperature changes and an alkali vapor measuring device for monitoring alkali vapor concentration changes are installed at the measuring hole 12. Specifically, the thermocouple measuring device and the alkali vapor measuring device are mounted on the same mounting base. The mounting base is used to fix the combined measuring device at the position where measurement is required. The mounting base has mounting holes for mounting the thermocouple measuring device and the alkali vapor measuring device. The size and position of the mounting holes are adapted to the shape and layout of the thermocouple measuring device and the alkali vapor measuring device.

[0044] The thermocouple measuring device includes a type B thermocouple and an external corundum tube for protecting the type B thermocouple. The type B thermocouple is used to measure the temperature at the measuring hole 12 and monitor temperature changes. The external corundum tube is sleeved on the outside of the type B thermocouple to provide physical protection and chemical isolation for the type B thermocouple.

[0045] Specifically, the type B thermocouple can be a double platinum-rhodium thermocouple, composed of platinum-rhodium 30 alloy wire and platinum-rhodium 6 alloy wire to form thermoelectrodes, used to accurately measure temperature in high-temperature environments; the outer corundum tube can be made of high-purity corundum material, which has the characteristics of high temperature resistance and corrosion resistance, and its inner diameter is adapted to the outer diameter of the type B thermocouple to tightly fit the type B thermocouple.

[0046] The alkali vapor measuring device includes a measuring body and a circulating water jacket disposed outside the measuring body. The measuring body is used to measure the alkali vapor concentration at measuring port 12 and monitor changes in the alkali vapor concentration. The circulating water jacket is connected to an external circulating water system and is used to cool and protect the measuring body to prevent it from burning out. Specifically, the measuring body of the alkali vapor measuring device uses a sensor based on electrochemical or optical principles for accurate measurement of the alkali vapor concentration.

[0047] The circulating water jacket includes a water jacket body and an inlet and an outlet on the water jacket body. The inlet and outlet are connected to the water supply pipe and return pipe of the external circulating water system, respectively, to form a circulating water loop. The water jacket body is a closed cavity structure surrounding the measuring body, and there is a certain gap between its inner wall and the outer wall of the measuring body to ensure that the circulating water can flow fully and carry away heat.

[0048] It also includes: a controller, a thermocouple measuring device, and an alkaline vapor measuring device, all electrically connected to the controller. The controller is electrically connected to the gas delivery device and is used to adjust the flow rate of the gas delivery device based on the temperature and alkaline vapor concentration data collected by the thermocouple measuring device and the alkaline vapor measuring device. Specifically, the controller can be a DCS system.

[0049] It should be noted that the DCS system is used to achieve real-time linkage between the temperature of the rear wall 1 of the melting section and the gas flow rate, thus achieving the purpose of adjustment and controllability. Specifically, the gas flow rate is precisely regulated by the DCS system. When introducing gas, the amount of gas is initially small, and then the gas flow rate is adjusted according to the measurement results of the thermocouple measuring device and the alkali vapor measuring device installed at the measuring hole 12.

[0050] The air inlet pipe 4 can be set at an angle of 30-45° to the plane of the rear mountain wall 1 of the melting section, and the extension of the air inlet pipe 4 can be 5-50mm.

[0051] The air intake pipe 4 is detachably and symmetrically installed on the left breast wall 2 and the right breast wall 3 of the melting section. The air intake pipe 4 can be made of 310S stainless steel.

[0052] In specific implementation, taking the installation of oxygen into the right breast wall 3 of the melting section as an example: before installing the air inlet pipe 4, an infrared thermometer is used to manually measure the temperature at the location where the air inlet pipe 4 is installed. The temperature is 1450℃. The temperature at the measuring hole 12 on the inner surface of the arch 11 of the rear mountain wall 1 of the melting section (measured by a thermocouple measuring device) is 1454℃. By comparing the temperature at the location of the air inlet pipe 4 with the temperature at the measuring hole 12, it is convenient for subsequent analysis. Install the air inlet pipe 4, extending it 50mm into the breast wall and at a 30° angle to the plane of the rear mountain wall 1 of the melting section. Connect the inlet of the air inlet pipe 4 to the gas delivery device and perform pipeline debugging. After the pipeline debugging is completed, the flow rate can be precisely adjusted through the DCS system in the central control room. First, introduce a small amount of gas (flow rate of 50m³ / h) and observe the measurement data of the thermocouple measuring device and the alkali vapor measuring device at measuring hole 12. Then, adjust the flow rate to achieve precise temperature control at this point, thereby reducing the concentration of alkali vapor (the control temperature can be set in the DCS system to achieve precise control of the gas flow rate. After the gas is introduced, the furnace operating conditions and plate quality changes need to be tracked in a timely manner).

[0053] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A furnace wall structure capable of reducing solid phase defects in glass furnaces, characterized in that, include: The rear wall of the melting section, the left breast wall of the melting section, and the right breast wall of the melting section; An air inlet pipe is provided through both the left breast wall and the right breast wall of the melting section; The inlet of the air intake pipe is connected to the air delivery device; The outlet of the air inlet pipe is positioned towards the rear wall of the melting section, and is used to directionally cool the rear wall of the melting section.

2. The furnace wall structure for reducing solid phase defects in glass furnaces according to claim 1, characterized in that, Measuring holes are provided on the arch of the rear wall of the melting section; The measuring hole is equipped with a thermocouple measuring device for monitoring temperature changes and an alkaline vapor measuring device for monitoring alkaline vapor concentration changes.

3. The furnace wall structure for reducing solid phase defects in glass furnaces according to claim 2, characterized in that, The thermocouple measuring device includes a type B thermocouple and an external corundum tube for protecting the type B thermocouple; The type B thermocouple is used to measure the temperature at the location of the measuring hole and monitor temperature changes. The external corundum tube is sleeved on the outside of the type B galvanometer to provide physical protection and chemical isolation for the type B galvanometer.

4. The furnace wall structure for reducing solid phase defects in glass furnaces according to claim 2, characterized in that, The alkaline vapor measuring device includes a measuring body and a circulating water jacket disposed outside the measuring body; The measuring body is used to measure the concentration of alkali vapor at the measuring hole location and monitor changes in the alkali vapor concentration; The circulating water jacket is connected to an external circulating water system and is used to cool and protect the measuring body to prevent it from being burned out.

5. The furnace wall structure for reducing solid phase defects in glass furnaces according to claim 4, characterized in that, The circulating water jacket includes a water jacket body and an inlet and an outlet disposed on the water jacket body; The inlet and outlet are respectively connected to the water supply pipe and return pipe of the external circulating water system to form a circulating water loop.

6. The furnace wall structure for reducing solid phase defects in glass furnaces according to claim 2, characterized in that, Also includes: Controller; Both the thermocouple measuring device and the alkaline vapor measuring device are electrically connected to the controller. The controller is electrically connected to the gas delivery device and is used to adjust the flow rate of the gas delivery device according to the temperature and alkali vapor concentration data collected by the thermocouple measuring device and the alkali vapor measuring device.

7. The furnace wall structure for reducing solid phase defects in glass furnaces according to claim 6, characterized in that, The controller is a DCS system.

8. The furnace wall structure for reducing solid phase defects in glass furnaces according to claim 1, characterized in that, The air inlet pipe is set at an angle of 30-45° to the plane of the rear wall of the melting section; The insertion depth of the intake pipe is 5~50mm.

9. The furnace wall structure for reducing solid phase defects in glass furnaces according to claim 1, characterized in that, The air intake pipe is detachably and symmetrically installed on the left breast wall and the right breast wall of the melting section.

10. The furnace wall structure for reducing solid phase defects in glass furnaces according to claim 1, characterized in that, The intake pipe is made of 310S stainless steel.

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