Regional efficient oxygen-fuel glass kiln

Abstract

The utility model provides a zoned oxygen-fuel glass kiln which comprises a primary melting zone used for melting batch input from a feed port to form molten glass, the primary melting zone comprises at least one first heater used for heating the batch and the molten glass, and the first heater is used for heating the batch and the molten glass; the first heater can comprise an electric boosting heater, an air burner or a total oxygen burner; the clarifying-homogenizing zone is arranged at the downstream of the primary melting zone, is communicated with the primary melting zone and is used for clarifying and homogenizing the molten glass from the primary melting zone; the device is characterized in that at least one second heater is arranged on the side wall of the clarifying-homogenizing area so as to heat the molten glass, and the second heater comprises a total oxygen burner. In the prior art, the processes of primary melting, clarification and homogenization are carried out and completed in one molten pool, however, the molten pool is divided into two physical division areas, namely a primary melting area and a clarification-homogenization area, and efficient oxygen-fuel combustion is adopted in the clarification-homogenization area.

Description

Technical Field

[0001] The utility model relates to a zoned and efficient oxygen-fuel glass kiln and process. Background Art

[0002] In the glass product production process, a glass kiln is used to heat the batch materials at high temperatures and melt them into glass liquid that meets the molding requirements. This generally includes five stages: 1. The silicate formation stage, in which the batch materials, after entering the kiln, rapidly undergo a series of physical, chemical and physical-chemical changes at 800-1000°C, such as heating of powder, evaporation of water, decomposition of salts, polycrystalline transformation, etc.; 2. The glass liquid formation stage, in which the batch materials are heated to 1200°C to form various silicates and a melt, until the temperature reaches about 1300°C, and the glass liquid begins to form; 3. The glass liquid clarification stage, in which visible gases are removed from the glass liquid. The stage of removing body inclusions and eliminating pore structure is called clarification stage, and this process must be completed at high temperature because the viscosity of glass decreases rapidly with increasing temperature; 4. Glass liquid homogenization stage, in which, after the glass liquid is formed, the chemical composition and temperature of each part of the glass liquid are different, and there are also some inhomogeneities, so a homogenization process is required, and its principle mainly relies on diffusion and convection; 5. Glass liquid cooling stage, in which, in order to facilitate the molding of glass, the glass liquid must be evenly cooled to the molding temperature. Generally, the molding temperature is 200-300℃ lower than the clarification temperature.

[0003] Figure 1 A glass furnace of the prior art is shown, which includes a batch material feed port 1, a glass liquid discharge port 2 and an exhaust gas port 3, wherein the glass furnace includes a primary melting zone 4 at the upstream end and a cooling zone 5 at the downstream end. A plurality of burners 6 are provided on the side wall of the primary melting zone 4. Batch material melting and glass liquid clarification and homogenization are carried out in the primary melting zone 4. Glass liquid cooling is carried out in the cooling zone 5. A kiln sill is provided between the primary melting zone 4 and the cooling zone 5 to prevent glass liquid from flowing back, and melted glass liquid is selected to enter the cooling zone 5 to improve the glass quality. However, in this glass furnace, the temperature and energy input in the primary melting zone are too high, resulting in low efficiency of the glass furnace.

[0004] Therefore, the present application provides a zoned efficient oxygen-fuel glass kiln and process, wherein the molten pool is divided into two physically divided areas: the primary melting zone and the clarification-homogenization zone, and efficient full oxygen combustion is adopted in the clarification-homogenization zone. Compared with the traditional gas combustion method, the utility model can achieve higher temperature and more complete combustion, thereby improving the glass heating efficiency and reducing energy consumption; reducing atmospheric pollutants in the exhaust gas during the combustion process, such as nitrogen oxides, etc.; compared with the traditional air combustion method, the load on the environment is smaller, which meets modern environmental protection requirements; it can effectively reduce the impurity content in the glass and improve the purity and transparency of the glass; thereby reducing bubbles and defects in the glass and improving the quality of the glass; and it can achieve a more efficient combustion process, improve the thermal efficiency of the kiln, and thus reduce energy consumption. Utility Model Content

[0005] Aspects and advantages of the present invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the present invention.

[0006] The utility model provides an oxygen-fuel glass furnace with different zones, comprising: a primary melting zone, which is used to melt batch materials input from a feed port to form molten glass, wherein the primary melting zone comprises at least one first heater to heat the batch materials and the molten glass; and a clarification-homogenization zone, which is downstream of the primary melting zone and connected to the primary melting zone, and is used to clarify and homogenize the molten glass from the primary melting zone; the utility model is characterized in that the side wall of the clarification-homogenization zone is provided with at least one second heater to heat the molten glass, wherein the second heater comprises an all-oxygen burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] A complete and enabling disclosure of the present invention, including the best mode thereof, for one of ordinary skill in the art is set forth in the specification with reference to the accompanying drawings, in which:

[0008] Figure 1 A prior art glass furnace is schematically shown;

[0009] Figure 2 A perspective view schematically showing a glass furnace of the present invention; and

[0010] Figure 3 The cross-sectional view of the glass furnace of the present invention is schematically shown. DETAILED DESCRIPTION

[0011] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are shown in the accompanying drawings. Each example is provided by way of explanation of the present invention rather than by way of limitation. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the scope of the present invention. For example, a feature shown or described as part of one embodiment may be used together with another embodiment to produce yet another embodiment. Therefore, the present invention is intended to cover such modifications and variations as fall within the scope of the appended claims and their equivalents.

[0012] like Figure 2 and Figure 3 As shown, the utility model provides a zoned oxygen-fuel glass furnace, which may include a primary melting zone 11, which is used to melt the batch material input from the feed port 12 to form glass liquid. After entering the furnace, the batch material rapidly undergoes a series of physical, chemical and physical-chemical changes, such as powder heating, water evaporation, salt decomposition, polycrystalline transformation, etc., and various silicates are formed and melts appear, until glass liquid begins to form.

[0013] In some embodiments, the feed port 12 may be disposed at the upstream end of the primary melting zone 11. The primary melting zone 11 includes at least one first heater 13 to heat the batch material and the glass liquid. The first heater 13 may include an electric fluxing heater, which is disposed at the bottom of the pool of the primary melting zone 11. Alternatively, the first heater 13 may include an air burner or an oxygen burner, which is disposed on the side wall of the primary melting zone 11. The oxygen burner can burn pure oxygen and natural gas. The oxygen burner may be a flat staged oxygen burner of a gas product and chemical company (e.g., see U.S. Pat. No. 5,611,682) or a double staged oxygen burner (e.g., see U.S. Pat. No. 10,584,051B2).

[0014] In some embodiments, the zoned oxygen-fuel glass furnace may further include a clarification-homogenization zone 14, which is downstream of the primary melting zone 11 and communicated with the primary melting zone 11, and is used to clarify and homogenize the glass liquid from the primary melting zone 11, so as to remove gas inclusions visible to the naked eye from the glass liquid, and perform a homogenization process, thereby improving the quality and stability of the glass products. The clarification-homogenization zone 14 may be provided with a glass liquid agitator to stir the glass liquid to improve the homogenization degree of the glass liquid.

[0015] In some embodiments, the bottom of the clarification-homogenization zone 14 may be higher than the bottom of the primary melting zone 11 .

[0016] In the clarification-homogenization zone 14, efficient oxy-fuel combustion is used for heating. In some embodiments, the side wall of the clarification-homogenization zone 14 may be provided with at least one second heater 15 to heat the glass liquid. At least one second heater 15 may be arranged in the middle of the clarification-homogenization zone 14. The second heater 15 may include an oxy-fuel burner that can burn pure oxygen and natural gas. The oxy-fuel burner may be the above-mentioned flat staged oxy-fuel burner or double staged oxy-fuel burner of the gas products and chemical company.

[0017] The first heater 13 and the second heater 15 are configured to transfer as much heat as possible from the combustion of the fuel to the batch material and the molten glass, and as little as possible to the upper structure of the glass furnace. When the first heater 13 and the second heater 15 are burners, the first heater 13 and the second heater 15 may have a downward inclination angle so that the flames are parallel and run forward along the liquid surface of the molten glass.

[0018] In some embodiments, the exhaust port 16 may be provided at the upstream end of the primary melting zone 11 to discharge the exhaust gas. The exhaust port may be connected to a waste heat recovery device (not shown). During the glass melting process, the heat absorbed by the glass liquid accounts for only 40-45%, and the heat energy in the exhaust gas accounts for 30% of the total heat energy entering the glass furnace. Waste heat recovery can improve the energy efficiency of the glass furnace.

[0019] In some embodiments, a glass liquid discharge port 17 may be disposed at the downstream end of the clarification-homogenization zone 14 for discharging clarified and homogenized glass liquid.

[0020] In some embodiments, a partition wall 18 may be provided between the primary melting zone 11 and the clarification-homogenization zone 14, so that the space above the liquid surface of the primary melting zone 11 and the clarification-homogenization zone 14 is separated. A liquid flow hole (not shown) is provided at the bottom of the partition wall 18. The glass liquid may flow from the primary melting zone 11 to the clarification-homogenization zone 14 through the liquid flow hole.

[0021] In the prior art, the melting, clarification and homogenization functions are completed in the primary melting zone, and then the cooling function is completed in the cooling zone. The advantage of the utility model is that the glass melting furnace of the utility model completes melting in the primary melting zone, and completes clarification and homogenization in the clarification-homogenization zone, eliminates the cooling zone, and optimizes the arrangement of the burners therein, so as to reduce the process temperature, save energy, reduce emissions, and improve efficiency.

[0022] Compared with traditional combustion methods, the utility model can achieve higher temperature and more efficient combustion, thereby improving glass heating efficiency and reducing energy consumption; reducing atmospheric pollutants in exhaust gas, such as nitrogen oxides, during the combustion process; compared with traditional air combustion methods, it has a smaller load on the environment and meets modern environmental protection requirements; it can effectively reduce the impurity content in the glass and improve the purity and transparency of the glass; thereby reducing bubbles and defects in the glass and improving the quality of the glass; and it can achieve a more efficient combustion process, improve the thermal efficiency of the furnace, and thus reduce energy consumption.

[0023] This written description uses examples to disclose the present invention, including the best mode, and also enables any person skilled in the art to practice the present invention, including making and using any device or system and performing any incorporated method. The patentable scope of the present invention is defined by the claims and may include other examples that occur to a person skilled in the art. If these other examples include structural elements that are not different from the literal language of the claims, or if they include equivalent structural elements that have insubstantial differences from the literal language of the claims, these other examples are intended to be within the scope of the claims.

Claims

1. A zoned high-efficiency oxygen-fuel glass furnace, comprising: A primary melting zone (11) for melting batch materials input from a feed port (12) to form molten glass, wherein the primary melting zone (11) comprises at least one first heater (13) for heating the batch materials and the molten glass; as well as a clarification-homogenization zone (14), which is downstream of the primary melting zone and communicated with the primary melting zone, and is used to clarify and homogenize the molten glass from the primary melting zone; The invention is characterized in that the side wall of the clarification-homogenization zone (14) is provided with at least one second heater (15) for heating the molten glass, wherein the second heater (15) comprises an oxygen burner.

2. The zoned high-efficiency oxygen-fuel glass furnace according to claim 1, characterized in that: The at least one second heater (15) is arranged in the middle of the clarification-homogenization zone.

3. The zoned high-efficiency oxygen-fuel glass furnace according to claim 1, characterized in that: The first heater (13) comprises an electric fluxing heater, which is arranged at the bottom of the pool of the primary melting zone (11).

4. The zoned high-efficiency oxygen-fuel glass furnace according to claim 1, characterized in that: The first heater (13) comprises an air burner or an oxygen burner, which is arranged on the side wall of the primary melting zone (11).

5. The zoned high-efficiency oxygen-fuel glass furnace according to claim 4, characterized in that: The first heater (13) and the second heater (15) have a downward inclination angle so that the flames are parallel and run forward along the liquid surface of the glass liquid.

6. The zoned high-efficiency oxygen-fuel glass furnace according to claim 1, characterized in that: The oxygen-fuel glass furnace further comprises an exhaust gas port (16), wherein the exhaust gas port (16) is connected to a waste heat recovery device.

7. The zoned high-efficiency oxygen-fuel glass furnace according to claim 1, characterized in that: A partition wall (18) is arranged between the primary melting zone and the clarification-homogenization zone so that the space above the liquid surface of the primary melting zone and the clarification-homogenization zone are separated, and a liquid flow hole is arranged at the bottom of the partition wall.

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