Quartz glass ingot smelting device with heat circulation structure

Abstract

The invention discloses a quartz glass ingot smelting device with a heat circulation structure, which comprises a furnace body provided with an observation window, and a heat insulation layer and a hearth connected with an oxyhydrogen burner at the upper end which are sequentially arranged in the furnace body, the heat insulation layer is provided with a smoke outlet penetrating through the hearth, a spiral flue and a circulating flue, the spiral flue and the circulating flue are communicated with the smoke outlet, a heat distribution component is connected between the spiral flue and the circulating flue, and the lower portion of the hearth is provided with a molten pool and a forming channel located below the molten pool. A heat preservation cavity communicated with the circulating flue and connected with a temperature measuring piece is formed in the hearth below the molten pool, and an electromagnetic valve for controlling external air to enter and exit is arranged at an outlet in the lower portion of the heat preservation cavity. High-temperature smoke can be stably exhausted through the spiral channel and the smoke exhaust pipe, the influence on the temperature in the hearth is reduced, heat in the hearth can be recycled, no extra energy is needed to provide heat for the heat preservation cavity, energy consumption in the quartz glass ingot smelting process is reduced, and economic benefits of enterprises are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of fused quartz ingot melting, and particularly to a fused quartz ingot melting device with a heat circulation structure. Background Art

[0002] The gas melting technology of fused quartz ingots is one of the main technologies for fused quartz ingots at present. The fused quartz produced by the gas melting method has high purity, few bubbles, and high product quality. The existing gas melting quartz ingot technology is to use a hydrogen-oxygen burner to heat the bottom ingot and feed materials to it in the upper part of a furnace with an open bottom. The hydrogen-oxygen burner melts the quartz powder raw materials, and the melted raw materials are deposited on the bottom ingot. At the same time, the bottom ingot descends in the forming channel to form a cylindrical fused quartz ingot. Then, during the cooling stage after the fused quartz ingot is formed, natural cooling in the furnace is adopted to obtain the finished fused quartz ingot. To ensure the melting quality of the fused quartz ingot, the temperature control of the gas melting furnace is very important. Among them, the temperature in the furnace chamber and the temperature in the forming stage need to be strictly controlled.

[0003] In actual production, the temperature required to melt the quartz powder raw materials is above 1750°C. The accumulated temperature and pressure in the furnace chamber are relatively high. Generally, the high-temperature flue gas in the furnace chamber is discharged in time by means of a flue. At the same time, the temperature in the forming stage also needs to be strictly controlled. It is necessary to use a heating component to keep the fused quartz ingot in the forming stage warm to prevent defects such as bubbles in the fused quartz ingot caused by too fast cooling. However, this has created two problems: on the one hand, while the discharge of high-temperature flue gas causes heat loss, the heat preservation measures in the forming stage also cause a large amount of energy consumption in the melting process, which is not conducive to the cost reduction and efficiency improvement of enterprises; on the other hand, the process of discharging high-temperature flue gas from the flue is not very stable. Whether the high-temperature flue gas is discharged too fast or too slow will cause the temperature in the furnace chamber to be unstable, thereby affecting the forming quality of the fused quartz ingot. Summary of the Invention

[0004] In order to solve the technical problems existing in the prior art that there is a large amount of energy consumption in the melting process of fused quartz ingots, and the process of discharging high-temperature flue gas from the flue is not very stable, affecting the forming quality of fused quartz ingots, the present invention provides the following technical solutions.

[0005] The present invention relates to a quartz glass ingot melting device with a heat circulation structure, which includes a furnace body provided with an observation window, and a heat insulation and heat preservation layer and a furnace chamber with a hydrogen-oxygen burner connected to the upper end, which are sequentially arranged inside the furnace body. The heat insulation and heat preservation layer is provided with a flue gas outlet penetrating through the furnace chamber, a spiral flue and a circulation flue communicated with the flue gas outlet. A heat distribution component is connected between the spiral flue and the circulation flue. A melting pool and a forming channel located below the melting pool are provided at the lower part of the furnace chamber. A heat preservation cavity connected to the circulation flue and provided with a temperature measuring element is formed below the melting pool in the furnace chamber. An electromagnetic valve for controlling the entry and exit of external air is provided at the lower outlet of the heat preservation cavity.

[0006] As a further technical solution, the heat distribution component includes a rotating shaft penetrating through the furnace body and extending into the heat insulation and heat preservation layer, and a four-way component fixed to one end of the rotating shaft and located between the spiral flue and the circulation flue.

[0007] As a further technical solution, the four-way component includes a flue gas inlet communicated with the flue gas outlet, a first flue gas port communicated with the spiral flue, and a second flue gas port communicated with the circulation flue.

[0008] As a further technical solution, a single-pass port communicated with the flue gas inlet is provided between the first flue gas port and the second flue gas port.

[0009] As a further technical solution, a stepped cooling cavity provided with a ventilation port is arranged at the lower part of the furnace body below the furnace chamber, and the stepped cooling cavity is arranged around the lower part of the forming channel.

[0010] As a further technical solution, a hollow partition column surrounding the lower part of the forming channel is arranged at the lower part of the stepped cooling cavity, and a rapid cooling cavity is formed between the partition column and the forming channel.

[0011] As a further technical solution, a strong exhaust fan located in the stepped cooling cavity is connected to the rapid cooling cavity, and an air outlet pipe extending to the outside of the furnace body is connected to the bottom of the rapid cooling cavity.

[0012] As a further technical solution, a partition ring is arranged on the outer periphery above the melting pool.

[0013] As a further technical solution, the heat distribution component is connected to a driving component located outside the furnace body.

[0014] As a further technical solution, a baffle plate blocking the outlet of the circulation flue is arranged in the heat preservation cavity.

[0015] Advantages of the present invention: The flue gas outlet of the present invention is respectively connected to the spiral flue and the circulation flue through a heat distribution component. The heat distribution component can control the flow direction of the high-temperature flue gas. Furthermore, the high-temperature flue gas can be stably discharged through the spiral channel and the exhaust pipe, reducing the impact on the temperature inside the furnace and ensuring the forming quality of the quartz glass ingot. At the same time, the high-temperature flue gas also provides sufficient heat for the heat preservation cavity, enabling the heat inside the furnace to be recycled. There is no need to use additional energy to provide heat for the heat preservation cavity, reducing the energy consumption during the melting process of the quartz glass ingot and ensuring the economic benefits of the enterprise. The stepped cooling cavity at the lower part of the forming channel can perform stepped cooling on the formed quartz glass ingot, thereby ensuring the cooling quality and cooling efficiency of the quartz glass ingot. Brief Description of the Drawings

[0016] Figure 1 is a schematic cross-sectional view of the quartz glass ingot melting device with a heat circulation structure according to the present invention;

[0017] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0018] Figure 3 is a schematic view of the heat distribution component of the quartz glass ingot melting device with a heat circulation structure according to the present invention;

[0019] In the figure: 1 - furnace body; 2 - heat insulation layer; 3 - furnace chamber; 4 - oxy-hydrogen burner; 5 - flue gas outlet; 6 - spiral flue; 7 - exhaust pipe; 8 - heat distribution component; 801 - rotating shaft; 802 - four-way piece; 803 - flue gas inlet; 804 - first flue gas port; 805 - second flue gas port; 806 - single-pass port; 9 - driving component; 10 - observation window; 11 - circulation flue; 12 - baffle plate; 13 - heat preservation cavity; 14 - temperature measuring component; 15 - solenoid valve; 16 - molten pool; 17 - partition ring; 18 - forming channel; 19 - stepped cooling cavity; 20 - ventilation port; 21 - partition column; 22 - rapid cooling cavity; 23 - forced exhaust fan; 24 - air outlet pipe; 25 - drawing component. Detailed Embodiments

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0021] In the description of the present invention, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0022] As Figure 1 shown, a quartz glass ingot melting device with a heat circulation structure according to the present invention includes a furnace body 1, a heat insulation layer 2, and a furnace chamber 3 located inside the heat insulation layer 2. A hydrogen-oxygen burner 4 is installed above the furnace chamber 3. Among them, the furnace body 1 is made of steel plates, and an observation window 10 penetrating through the furnace body 1, the heat insulation layer 2, and the furnace chamber 3 is provided on the outside thereof. The heat insulation layer 2 is made of refractory asbestos or refractory fiber board material, and the furnace chamber 3 is made of refractory material, and the refractory material is one of alumina, zirconia, or corundum. A conventional slow-down mechanism (not shown) is provided below the furnace body 1, and a bottom ingot is provided at the upper end of the slow-down mechanism. The hydrogen-oxygen burner 4 is used to eject and burn the quartz powder raw material, so that the molten quartz liquid is deposited on the bottom ingot of the slow-down mechanism and is slowly drawn and formed downward from the forming channel 18.

[0023] In a preferred embodiment, the heat insulation layer 2 is provided with a flue gas outlet 5 penetrating through the furnace chamber 3, and the flue gas outlet 5 is used to discharge the high-temperature flue gas in the furnace chamber 3. A spiral flue 6 and a circulation flue 11 are further provided in the heat insulation layer 2, and the smoke inlets of the spiral flue 6 and the circulation flue 11 are oppositely arranged. The flue gas outlet 5 is communicated with the spiral flue 6 and the circulation flue 11. A heat distribution component 8 is connected between the spiral flue 6 and the circulation flue 11, and the heat distribution component 8 is used to divert the high-temperature flue gas in the flue gas outlet 5, so that the high-temperature flue gas discharged from the flue gas outlet 5 only flows to the spiral flue 6, or only flows to the circulation flue 11, or flows to the spiral flue 6 and the circulation flue 11 at the same time. Thus, the heat distribution component 8 can accurately control the flow direction of the high-temperature flue gas to discharge or recycle it.

[0024] In a preferred embodiment, a molten pool 16 is provided at the lower part of the furnace chamber 3, and a partition ring 17 is provided on the outer periphery above the molten pool 16. The partition ring 17 can prevent impurities in the high-temperature flue gas with a changing temperature at the flue gas outlet 5 from falling. A forming channel 18 is provided below the molten pool 16. The forming channel 18 is used for the forming of the quartz melt. The forming channel 18 extends from the lower part of the furnace chamber 3 to below the furnace chamber 3. The slow descent mechanism can move upward from the forming channel 18 to the upper end of the forming channel 18, and the quartz melt starts to gradually deposit and form on the bottom ingot of the slow descent mechanism. At the same time, a drawing component 25 is provided below the forming channel 18. The drawing component 25 uses an existing drawing machine, and its moving speed is the same as that of the slow descent component. The formed quartz glass ingot can gradually descend under the action of the slow descent component and be slowly drawn into shape by the drawing component 25.

[0025] In a preferred embodiment, a heat preservation cavity 13 communicating with the circulating flue 11 is formed in the part of the furnace chamber 3 located below the molten pool 16. The temperature in the heat preservation cavity 13 is constant, which is convenient for the smooth forming of the quartz glass ingot and the forming quality. A temperature measuring element 14 is connected in the heat preservation cavity 13. The temperature measuring element 14 can use a high-temperature resistant thermocouple to monitor the temperature in the heat preservation cavity 13. At the same time, a solenoid valve 15 for controlling the entry and exit of external air is provided at the lower outlet of the heat preservation cavity 13, and the opening or closing of the solenoid valve 15 can be controlled according to the temperature in the heat preservation cavity 13.

[0026] When the temperature in the heat preservation cavity 13 is normal, the heat distribution component 8 makes the high-temperature flue gas in the flue gas outlet 5 flow only to the spiral flue 6, and the solenoid valve 15 is closed; when the temperature in the heat preservation cavity 13 is relatively high, the heat distribution component 8 makes the high-temperature flue gas in the flue gas outlet 5 flow only to the spiral flue 6, the solenoid valve 15 is opened, and external air flows into the heat preservation cavity 13 to cool the inside of the heat preservation cavity 13; when the temperature in the heat preservation cavity 13 is relatively low, the heat distribution component 8 makes the high-temperature flue gas in the flue gas outlet 5 flow only to the circulating flue 11 to heat up the heat preservation cavity 13, the solenoid valve 15 is opened, and the gas with a relatively low temperature in the heat preservation cavity 13 is discharged; when the temperature in the heat preservation cavity 13 is slightly low, the heat distribution component 8 can make the high-temperature flue gas in the flue gas outlet 5 flow to both the spiral flue 6 and the circulating flue 11 at the same time to heat up the heat preservation cavity 13. At this time, the solenoid valve 15 can be opened or not, which does not affect the heating of the inside of the heat preservation cavity 13.

[0027] A baffle plate 12 blocking the outlet of the circulating flue 11 is provided in the heat preservation cavity 13. The baffle plate 12 can prevent the high-temperature flue gas in the circulating flue 11 from directly blowing towards the forming channel 18. After being blocked by the baffle plate 12, the high-temperature flue gas can be evenly distributed in the heat preservation cavity 13 to evenly increase the temperature in the heat preservation cavity 13.

[0028] In a preferred embodiment, the spiral flue 6 refers to a flue structure that spirally surrounds the furnace chamber 3 and is spirally distributed within the heat insulation layer 2. Although the heat insulation layer 2 can insulate heat, some heat will still escape. Therefore, when the spiral flue 6 discharges high-temperature flue gas, the high-temperature flue gas is evenly discharged around the outer periphery of the furnace chamber 3, and its discharge speed is relatively stable, without affecting the temperature inside the furnace chamber 3, ensuring the temperature stability inside the furnace chamber 3 and the stable forming of the subsequent quartz glass ingot. In addition, the spiral flue 6 is connected to a smoke exhaust pipe 7 that extends outside the furnace body 1. The smoke exhaust pipe 7 can be connected to a fan or not connected to a fan. The high-temperature flue gas can be freely discharged or quantitatively extracted by the fan. The present invention does not make any special limitations on this.

[0029] In a preferred embodiment, a stepped cooling chamber 19 is provided below the furnace body 1 and located below the furnace chamber 3. The stepped cooling chamber 19 is used to quickly cool and shape the already formed quartz glass ingot in the forming channel 18, making the formed quartz glass ingot more stable and facilitating the subsequent drawing and cutting operations of the quartz glass ingot. An air vent 20 is provided on one side of the stepped cooling chamber 19, and air can enter through the air vent 20. Of course, the air vent 20 can also be connected to a fan to control the air flow rate inside the stepped cooling chamber 19. Of course, the present invention does not make any special limitations on this. The stepped cooling chamber 19 is arranged around the lower part of the forming channel 18, and the external air can naturally cool or quickly cool the quartz glass ingot in the forming channel 18.

[0030] At the same time, a hollow partition column 21 that surrounds the lower part of the forming channel 18 is provided below the stepped cooling chamber 19. A rapid cooling chamber 22 is formed between the partition column 21 and the forming channel 18. The bottom of the rapid cooling chamber 22 is connected to an air outlet pipe 24 that extends outside the furnace body 1. Thus, the upper part of the stepped cooling chamber 19 naturally cools the quartz glass ingot, and the lower part of the stepped cooling chamber 19 quickly cools the quartz glass ingot again. The rapid cooling chamber 22 is connected to a strong exhaust fan 23 located inside the stepped cooling chamber 19. The strong exhaust fan 23 can quickly blow the air inside the stepped cooling chamber 19 into the rapid cooling chamber 22. At this time, the air used for cooling in the rapid cooling chamber 22 has the same temperature as the air used in the stepped cooling chamber 19, but the cooling speed is faster, enabling the quartz glass ingot to be quickly cooled and facilitating subsequent processing.

[0031] Such as Figure 2 and Figure 3As shown, in a preferred embodiment, the heat distribution component 8 includes a rotating shaft 801 that penetrates the furnace body 1 and extends into the heat insulation layer 2. The heat distribution component 8 is connected to a driving member 9 located outside the furnace body 1. The driving member 9 is a driving motor for driving the rotation of the rotating shaft 801. One end of the rotating shaft 801 away from the driving member 9 is fixedly connected to a four-way member 802. The four-way member 802 is located between the spiral flue 6 and the circulation flue 11, and the four-way member 802 is used to control the flow direction of the high-temperature flue gas. Specifically, the four-way member 802 is generally spherical in structure. The four-way member 802 includes a flue gas inlet 803 communicating with the flue gas outlet 5, a first flue gas port 804 communicating with the spiral flue 6, and a second flue gas port 805 communicating with the circulation flue 11.

[0032] In this embodiment, the spiral flue 6 and the circulation flue 11 are oppositely arranged, the first flue gas port 804 and the second flue gas port 805 are also oppositely arranged, and a single-pass port 806 communicating with the flue gas inlet 803 is provided between the first flue gas port 804 and the second flue gas port 805. The axis of the single-pass port 806 is perpendicular to the axis of the first flue gas port 804 and the axis of the second flue gas port 805 respectively. Thus, when the driving member 9 drives the rotation of the rotating shaft 801, it drives the four-way member 802 to rotate. When the four-way member 802 rotates, the flue gas inlet 803 is always in communication with the flue gas outlet 5.

[0033] Take Figure 3 as an example. When the first flue gas port 804 is aligned with the spiral flue 6 and the second flue gas port 805 is aligned with the circulation flue 11, the single-pass port 806 is closed, and the high-temperature flue gas is discharged from the flue gas inlet 803 to both the spiral flue 6 and the circulation flue 11 at the same time; the rotating shaft 801 rotates 90 degrees clockwise, the first flue gas port 804 and the second flue gas port 805 are closed, the single-pass port 806 is communicated with the circulation flue 11, and the high-temperature flue gas is discharged from the flue gas inlet 803 only to the circulation flue 11; the rotating shaft 801 continues to rotate 90 degrees clockwise, the first flue gas port 804 is aligned with the spiral flue 6 and the second flue gas port 805 is aligned with the circulation flue 11, the single-pass port 806 is closed, and the high-temperature flue gas is discharged from the flue gas inlet 803 to both the spiral flue 6 and the circulation flue 11 at the same time; the rotating shaft 801 continues to rotate 90 degrees clockwise, the first flue gas port 804 and the second flue gas port 805 are closed, the single-pass port 806 is communicated with the spiral flue 6, and the high-temperature flue gas is discharged from the flue gas inlet 803 only to the spiral flue 6. Thus, the heat distribution component 8 can achieve the diversion of the high-temperature flue gas, enabling the high-temperature flue gas to be discharged or recycled.

[0034] The preferred specific embodiments and examples of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A fused quartz ingot melting device with a heat circulation structure, comprising a furnace body (1) provided with an observation window (10), and a heat insulation layer (2) and a furnace chamber (3) with a hydrogen-oxygen burner (4) connected to the upper end, which are sequentially arranged inside the furnace body (1), and is characterized in that: The heat insulation layer (2) is provided with a flue gas outlet (5) penetrating through the furnace chamber (3), a spiral flue (6) and a circulation flue (11) communicated with the flue gas outlet (5). A heat distribution component (8) is connected between the spiral flue (6) and the circulation flue (11). A molten pool (16) and a forming channel (18) located below the molten pool (16) are provided at the lower part of the furnace chamber (3). A heat preservation cavity (13) connected with a temperature measuring element (14) and communicated with the circulation flue (11) is formed below the molten pool (16) in the furnace chamber (3). An electromagnetic valve (15) for controlling the entry and exit of external air is provided at the lower outlet of the heat preservation cavity (13).

2. The quartz glass ingot melting device with a heat circulation structure according to claim 1, characterized in that: The heat distribution component (8) includes a rotating shaft (801) penetrating through the furnace body (1) and extending into the heat insulation layer (2), and a four-way component (802) fixedly connected to one end of the rotating shaft (801) and located between the spiral flue (6) and the circulation flue (11).

3. The quartz glass ingot melting device with a heat circulation structure according to claim 2, characterized in that: The four-way component (802) includes a flue gas inlet (803) communicated with the flue gas outlet (5), a first flue gas port (804) communicated with the spiral flue (6), and a second flue gas port (805) communicated with the circulation flue (11).

4. The quartz glass ingot melting device with a heat circulation structure according to claim 3, characterized in that: A single-pass port (806) communicated with the flue gas inlet (803) is provided between the first flue gas port (804) and the second flue gas port (806).

5. The fused quartz ingot melting device with a heat circulation structure according to claim 1, characterized in that: A stepped cooling cavity (19) with a vent port (20) is provided at the lower part of the furnace body (1) and below the furnace chamber (3). The stepped cooling cavity (19) is arranged around the lower part of the forming channel (18).

6. The fused quartz ingot melting device with a heat circulation structure according to claim 5, characterized in that: A hollow partition column (21) surrounding the lower part of the forming channel (18) is provided at the lower part of the stepped cooling cavity (19). A rapid cooling cavity (22) is formed between the partition column (21) and the forming channel (18).

7. The fused quartz ingot melting device with a heat circulation structure according to claim 6, characterized in that: The rapid cooling cavity (22) is connected with a strong exhaust fan (23) located in the stepped cooling cavity (19). The bottom of the rapid cooling cavity (22) is connected with an air outlet pipe (24) extending to the outside of the furnace body (1).

8. The fused quartz ingot melting device with a heat circulation structure according to claim 1, characterized in that: A partition ring (17) is provided on the outer periphery above the molten pool (16).

9. The fused quartz ingot melting device with a heat circulation structure according to claim 1, characterized in that: The heat distribution component (8) is connected with a driving component (9) located outside the furnace body (1).

10. The fused quartz ingot melting device with a heat circulation structure according to claim 1, characterized in that: A baffle plate (12) blocking the outlet of the circulation flue (11) is provided in the heat preservation cavity (13).

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