A hydrogen-oxygen flame quartz furnace

Abstract

The utility model discloses a hydrogen oxygen flame quartz smelting furnace, including furnace body and located furnace body inboard heat -proof layer, and the heat -proof layer inboard is equipped with hearth, and the hearth upper portion is installed with hydrogen oxygen combustor, and the hearth lower portion is equipped with with the slow -descending part connection for the quartz ingot forming forming channel, and the hearth is equipped with the smoke outlet channel of a plurality of through to the heat -proof layer, and the smoke outlet channel is connected with the fan flue and is located the chimney of fan flue upper end, and the hearth lower portion is equipped with the extension section around forming channel, and the extension section inboard upper portion is equipped with the heating cavity around forming channel upper portion, and the heating cavity is equipped with a plurality of thermocouple and the electric heating net around forming channel upper portion. The utility model can carry out timely and even discharge to the high temperature flue gas in smelting furnace, reduces the pressure variation in smelting furnace, improves hydrogen oxygen flame's combustion operating mode and the stability of combustion temperature, can guarantee the temperature required when quartz powder melts and fuses with the bottom ingot, guarantees the forming quality of quartz ingot.

Description

TECHNICAL FIELD

[0001] The utility model relates to quartz smelting furnace technical field especially relates to a hydrogen oxygen flame quartz smelting furnace. BACKGROUND

[0002] Quartz products have high purity, high temperature stability and other excellent characteristics, and are widely used in the fields of electronics, optics and semiconductors. The production process of quartz ingot is first to melt quartz sand at high temperature to make it into liquid state. In a high temperature environment, the quartz sand will melt to form a quartz solution. Then, by controlling the temperature and cooling rate, the quartz solution is cooled to form a quartz ingot. At present, the smelting furnace for producing quartz ingot by gas refining method is generally a hydrogen oxygen flame smelting furnace. The hydrogen oxygen flame smelting furnace is a smelting furnace with an open bottom, which uses a hydrogen oxygen burner to heat the bottom ingot and transmit quartz powder raw materials to it, so that the quartz powder raw materials are melted and deposited on the bottom ingot, and at the same time, the bottom ingot is lowered to form a cylindrical quartz ingot. After the quartz ingot is formed, natural cooling is adopted in the furnace to obtain the finished quartz ingot.

[0003] In actual production, the temperature required for melting the quartz powder raw materials is above 1750℃, and the temperature at the center of the hydrogen oxygen flame is above 2000℃. In order to ensure the stability of the temperature and pressure in the smelting furnace, high temperature flue gas needs to be discharged in time. However, although the discharge of high temperature flue gas can promote the stability of the pressure in the smelting furnace, the pressure in the smelting furnace always fluctuates slightly around the stable value. The pressure fluctuation will also cause changes in the combustion conditions of the hydrogen oxygen flame, and then the combustion temperature of the hydrogen oxygen flame when melting the quartz powder will also change. The combustion temperature of the hydrogen oxygen flame is unstable. If the temperature of the hydrogen oxygen flame is too high, it will cause the outer layer of the finished quartz ingot to produce ripples. If the temperature of the hydrogen oxygen flame is too low, it will cause the fusion of the quartz powder with the bottom ingot to be not thorough enough when the quartz powder is melted, resulting in defects such as air holes in the quartz ingot, and the forming quality of the quartz ingot is poor. SUMMARY

[0004] In order to solve the technical problems of the prior art that the pressure fluctuation in the smelting furnace when high temperature flue gas is discharged will cause changes in the combustion conditions of the hydrogen oxygen flame, and the combustion temperature of the hydrogen oxygen flame when melting the quartz powder will also change, and the combustion temperature of the hydrogen oxygen flame is unstable, the utility model provides the following technical scheme.

[0005] This utility model discloses a hydrogen-oxygen flame quartz melting furnace, comprising a furnace body and a heat insulation layer located inside the furnace body. A furnace chamber is located inside the heat insulation layer. A hydrogen-oxygen burner is installed on the upper part of the furnace chamber. A forming channel for quartz ingot forming is provided in the lower part of the furnace chamber and connected to a slow-descent component. The furnace chamber has several smoke outlet channels penetrating the heat insulation layer. Each smoke outlet channel is connected to a fan-shaped flue and a chimney located at the upper end of the fan-shaped flue. An extension section surrounding the forming channel is provided in the lower part of the furnace chamber. A heating cavity surrounding the upper part of the forming channel is provided on the upper part of the inner side of the extension section. Several thermocouples and an electric heating mesh surrounding the upper part of the forming channel are provided in the heating cavity.

[0006] As a further technical solution, the upper part of the chimney is connected to a solenoid valve and an exhaust fan respectively through a three-way pipe.

[0007] As a further technical solution, each of the smoke outlet channels is individually connected to a fan-shaped smoke duct, and adjacent fan-shaped smoke ducts may or may not be interconnected.

[0008] As a further technical solution, the upper end of the forming channel and the upper end of the heating cavity are higher than the bottom of the furnace.

[0009] As a further technical solution, the temperature control system inside the furnace is electrically connected to the electric heating network and the thermocouple.

[0010] As a further technical solution, the number of flue gas outlet channels is four, and the flue gas outlet channels are evenly distributed radially along the furnace.

[0011] The beneficial effects of this invention are as follows: The furnace chamber of this invention is equipped with multiple smoke outlet channels, each connected to an independent fan-shaped flue. An exhaust fan is connected to the chimney at the upper end of the fan-shaped flue. This allows for timely and uniform discharge of high-temperature flue gas from the furnace, reducing pressure fluctuations and improving the stability of temperature and pressure within the furnace, thereby enhancing the combustion conditions and temperature stability of the oxyhydrogen flame. Simultaneously, the lower part of the furnace chamber has an extension section. The upper inner side of the extension section has a heating chamber surrounding the upper part of the forming channel. The heating chamber contains several thermocouples and an electric heating mesh surrounding the upper part of the forming channel. The heating chamber heats the upper part of the forming channel, ensuring the temperature required for the quartz powder to melt and fuse with the ingot, thus guaranteeing the forming quality of the quartz ingot. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the longitudinal section structure of the hydrogen-oxygen flame quartz furnace of this utility model; Figure 2 This is a horizontal cross-sectional view of the flue gas outlet channel of the hydrogen-oxygen flame quartz furnace of this utility model; In the diagram: 1-furnace body; 2-heat insulation layer; 3-furnace chamber; 4-hydrogen-oxygen burner; 5-smoke outlet; 6-fan-shaped flue; 7-chimney; 8-solenoid valve; 9-exhaust fan; 10-forming channel; 11-quartz ingot; 12-heating chamber; 13-electric heating grid; 14-thermocouple; 15-extension section. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 merely illustrative of the present utility model and are not intended to limit the present utility model. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0014] In the description of this utility model, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0015] like Figure 1 As shown, this utility model discloses a hydrogen-oxygen flame quartz melting furnace, comprising a furnace body 1 and a heat insulation layer 2 located inside the furnace body 1. A furnace chamber 3 is located inside the heat insulation layer 2. The furnace body 1 is made of steel plate, the heat insulation layer 2 is made of refractory bricks constructed from refractory mortar, and the furnace chamber 3 is made of one of the following refractory materials: alumina, zirconium oxide, or corundum. A hydrogen-oxygen burner 4 is installed on the upper part of the furnace chamber 3. The hydrogen-oxygen burner 4 is used to fully mix and burn hydrogen, oxygen, and quartz powder raw materials, allowing the molten quartz solution to fuse with the ingot and be drawn into shape. An observation window penetrating the furnace body 1, the heat insulation layer 2, and the furnace chamber 3, as well as a pressure gauge and thermocouple for monitoring the pressure and temperature inside the furnace chamber 3, are also provided on the outside of the furnace body 1. These utilize existing technology and will not be described in detail here.

[0016] like Figure 2As shown, in a preferred embodiment, the furnace 3 is provided with several flue gas outlet channels 5 extending through the heat insulation layer 2. Each flue gas outlet channel 5 is connected to a fan-shaped flue 6, which is distributed circumferentially along the heat insulation layer 2. A chimney 7 is connected to the upper end of each fan-shaped flue 6. High-temperature flue gas from the furnace 3 can be discharged through the flue gas outlet channels 5, and as it flows out through the fan-shaped flue 6, it insulates the furnace 3. Finally, the high-temperature flue gas is discharged through the chimney 7. In this embodiment, there are four flue gas outlet channels 5, which are evenly distributed radially along the furnace 3. Each flue gas outlet channel 5 is individually connected to a fan-shaped flue 6. Adjacent fan-shaped flues 6 may or may not be interconnected, allowing the high-temperature flue gas from the furnace 3 to be evenly discharged from each flue gas outlet channel 5.

[0017] In a preferred embodiment, adjacent fan-shaped flues 6 are not interconnected, and each fan-shaped flue 6 is individually connected to a chimney 7. A solenoid valve 8 and an exhaust fan 9 are connected to the upper part of the chimney 7 via a three-way pipe. The solenoid valve 8 remains normally open, allowing high-temperature flue gas to be discharged from the upper part of the chimney 7. When the thermocouples in the furnace 3 detect that both the temperature and pressure inside the furnace 3 are high, the exhaust fan 9 can be turned on to increase the discharge of high-temperature flue gas, ensuring stable temperature and pressure inside the furnace 3.

[0018] like Figure 1 As shown, in a preferred embodiment, the lower part of the furnace chamber 3 is provided with a forming channel 10, and a slow-descent component, as used in the prior art, is provided below the forming channel 10. The slow-descent component pushes the bottom ingot into the upper part of the forming channel 10. After the quartz powder raw material melts and fuses with the bottom ingot, the slow-descent component slowly pulls it downward. The lower part of the furnace chamber 3 is provided with an extension section 15 surrounding the forming channel 10, and the forming channel 10 is also extended accordingly to facilitate monitoring of the temperature when the quartz powder melts and fuses with the bottom ingot in the upper part of the forming channel 10, and to heat and maintain the temperature when it is too low.

[0019] At this time, the upper inner side of the extension section 15 is provided with a heating cavity 12 surrounding the upper part of the forming channel 10. The heating cavity 12 is provided with several thermocouples 14 and an electric heating grid 13 surrounding the upper part of the forming channel 10. The temperature control system in the furnace 3 is electrically connected to the electric heating grid 13 and the thermocouples 14, and the upper end of the forming channel 10 and the upper end of the heating cavity 12 are higher than the bottom of the furnace 3. When the temperature in the furnace 3 and the temperature in the upper part of the forming channel 10 are too low, the electric heating grid 13 in the heating cavity 12 can be activated to heat the upper part of the forming channel 10, ensuring the temperature required for the quartz powder to melt and fuse with the bottom ingot, and ensuring the forming quality of the quartz ingot.

[0020] The preferred embodiments and examples of the present invention have been described in detail above with reference to 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 to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A hydrogen-oxygen flame quartz melting furnace, comprising a furnace body (1) and a heat insulation layer (2) located inside the furnace body (1), wherein a furnace chamber (3) is provided inside the heat insulation layer (2), a hydrogen-oxygen burner (4) is installed on the upper part of the furnace chamber (3), and a forming channel (10) for forming quartz ingots (11) is provided at the lower part of the furnace chamber (3) and connected to a slow-descent component, characterized in that: The furnace (3) is provided with several smoke outlet channels (5) that extend through the heat insulation layer (2). The smoke outlet channels (5) are connected to a fan-shaped flue (6) and a chimney (7) located at the upper end of the fan-shaped flue (6). The lower part of the furnace (3) is provided with an extension section (15) surrounding the forming channel (10). The upper part of the inner side of the extension section (15) is provided with a heating cavity (12) surrounding the upper part of the forming channel (10). The heating cavity (12) is provided with several thermocouples (14) and an electric heating grid (13) surrounding the upper part of the forming channel (10).

2. The oxyhydrogen flame quartz furnace according to claim 1, characterized in that: The upper part of the chimney (7) is connected to a solenoid valve (8) and an exhaust fan (9) via a three-way pipe.

3. The oxyhydrogen flame quartz furnace according to claim 1, characterized in that: Each of the smoke outlet channels (5) is individually connected to a fan-shaped smoke channel (6), and adjacent fan-shaped smoke channels (6) may or may not be interconnected.

4. The oxyhydrogen flame quartz furnace according to claim 1, characterized in that: The upper end of the forming channel (10) and the upper end of the heating cavity (12) are higher than the bottom of the furnace (3).

5. The oxyhydrogen flame quartz furnace according to claim 1, characterized in that: The temperature control system inside the furnace (3) is electrically connected to the electric heating network (13) and the thermocouple (14).

6. The oxyhydrogen flame quartz furnace according to claim 1, characterized in that: The number of the flue gas channels (5) is four, and the flue gas channels (5) are evenly distributed along the radial direction of the furnace (3).

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