Anti-backfire device for oxyhydrogen flame melting furnace

Abstract

The utility model discloses a hydrogen oxygen flame smelting furnace anti -backfire device, including furnace body, insulating layer and hearth, the hearth upper end is installed with hydrogen oxygen combustor and is equipped with the forming passageway at hearth lower extreme, the annular flue of insulating layer is equipped with the ring chimney of the upper end connection of the in-cavity of furnace, the emergency flue of being equipped with solenoid valve is equipped with the emergency flue of extending to the outside of furnace body, and the emergency flue and chimney are all connected to the air extractor, and hydrogen oxygen combustor is connected with the jet nozzle plate that inert gas sprays to hydrogen oxygen combustor export. The high temperature flue gas of the utility model can directly discharge from annular flue and emergency flue, avoid the hydrogen oxygen flame backfire phenomenon caused by the excessive pressure in hearth, the wick pipe is equipped with check valve, when the excessive pressure in hearth, can cut off the supply of oxygen and quartz powder, and the jet nozzle plate of hydrogen oxygen combustor side can blow out inert gas and block the export of hydrogen oxygen combustor, avoid the combustion of the in-cavity of hydrogen oxygen combustor, guarantee the safe use of hydrogen oxygen combustor.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen-oxygen flame furnace technology, and in particular to a backfire prevention device for hydrogen-oxygen flame furnaces. Background Technology

[0002] Quartz ingot gas refining technology is currently one of the important technologies in the field of quartz product production. It produces quartz ingots with larger diameters, better surface finish, and fewer internal defects, which is beneficial for subsequent processing. Currently, the furnaces used to produce quartz ingots are generally oxyhydrogen (OH) flame furnaces. In an OH flame furnace, a bottom ingot is heated by an OH burner within an open-bottomed furnace, and quartz powder is fed to it. The quartz powder melts and deposits on the bottom ingot, which then descends to form a cylindrical quartz ingot. After forming, the ingot is naturally cooled within the furnace, resulting in the finished quartz ingot. The temperature required for melting quartz powder using an OH flame is above 1750℃, and the OH burner must maintain good combustion conditions throughout the quartz ingot melting process.

[0003] Because the combustion speed and temperature of the hydrogen-oxygen mixture in an oxyhydrogen flame furnace are high, the pressure inside the furnace is also high during combustion. Therefore, it is necessary to exhaust the high-temperature flue gas from the furnace. However, if the high-temperature flue gas is exhausted too quickly, it will affect the furnace temperature and hinder the melting of quartz sand. If the high-temperature flue gas is not exhausted in time, it will cause excessive pressure inside the furnace, and may even lead to backfire in the oxyhydrogen burner. This can easily cause combustion inside the oxyhydrogen burner, resulting in burnout of the burner and gas supply pipeline, reducing the service life of the oxyhydrogen burner, and in severe cases, it may even cause a fire, creating a safety hazard. Utility Model Content

[0004] To address the technical problem in existing technologies where the untimely discharge of high-temperature flue gas from the furnace leads to excessive pressure inside the furnace, potentially causing backfire in the oxy-hydrogen burner, reducing its service life, and creating safety hazards, this utility model provides the following technical solution.

[0005] This utility model discloses a backfire prevention device for an oxyhydrogen flame furnace, comprising a furnace body, an insulation layer, and a furnace chamber. An oxyhydrogen burner is installed at the upper end of the furnace chamber, and a forming channel is provided at the lower end of the furnace chamber. The insulation layer has an annular flue extending into the inner cavity of the furnace chamber, with its upper end connected to a chimney. An emergency flue with an electromagnetic valve extends through the furnace chamber to the outside of the furnace body. Both the emergency flue and the chimney are connected to an exhaust fan. The oxyhydrogen burner is connected to a nozzle plate that sprays inert gas to the outlet of the oxyhydrogen burner.

[0006] As a further technical solution, the hydrogen-oxygen burner includes a hydrogen chamber and an oxygen chamber containing a plurality of wick tubes, wherein a one-way valve is axially installed on each wick tube.

[0007] As a further technical solution, the outer wall of the hydrogen-oxygen burner is fixedly connected to a pressure equalization chamber connected to the jet nozzle plate, the pressure equalization chamber is connected to a vent pipe that penetrates the hydrogen chamber, and the vent pipe extends to the outside of the hydrogen-oxygen burner and is connected to an inert gas connection end.

[0008] As a further technical solution, both the pressure equalization chamber and the jet nozzle plate are made of high-temperature resistant alloy materials.

[0009] As a further technical solution, the nozzle plate is disposed along one side of the outlet of the hydrogen-oxygen burner, and the length of the nozzle plate is greater than the diameter of the outlet of the hydrogen-oxygen burner.

[0010] As a further technical solution, the furnace is equipped with several pressure sensors, which are electrically connected to the air extraction fan and the solenoid valve.

[0011] The beneficial effects of this utility model are as follows: The insulation layer of this utility model is equipped with an annular flue that connects to the inner cavity of the furnace. The annular flue is connected to a chimney and an exhaust fan. The exhaust fan can promptly discharge the high-temperature flue gas in the furnace, reducing backfire caused by excessive pressure. Multiple pressure sensors are installed in the furnace. When the high-temperature flue gas in the furnace is not discharged in time, causing excessive pressure in the furnace, a solenoid valve can be opened, and the emergency flue connects to the exhaust fan. The high-temperature flue gas can be directly discharged from the emergency flue, avoiding backfire of the oxyhydrogen flame caused by excessive pressure in the furnace. Simultaneously, the wick tube is equipped with a one-way valve. When the pressure in the furnace is too high, the supply of oxygen and quartz powder can be cut off. The nozzle plate on one side of the oxyhydrogen burner can blow out inert gas to seal the outlet of the oxyhydrogen burner, further preventing backfire of the oxyhydrogen flame and preventing combustion in the inner cavity of the oxyhydrogen burner, ensuring the safe use of the oxyhydrogen burner. Attached Figure Description

[0012] Figure 1 This is a cross-sectional schematic diagram of the tempering device for an oxyhydrogen flame furnace according to this utility model; Figure 2 This is a cross-sectional schematic diagram of the hydrogen-oxygen burner of the hydrogen-oxygen flame furnace tempering device of this utility model; In the diagram: 1-furnace body; 2-insulation layer; 3-furnace chamber; 4-annular flue; 5-chimney; 6-exhaust fan; 7-emergency flue; 8-solenoid valve; 9-oxygen-hydrogen burner; 901-oxygen chamber; 902-hydrogen chamber; 903-wick tube; 904-one-way valve; 10-pressure sensor; 11-forming channel; 12-inert gas connection end; 13-vent pipe; 14-pressure equalization chamber; 15-jet nozzle plate. 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 flashback prevention device for an oxyhydrogen flame furnace, comprising a furnace body 1, an insulation layer 2, and a furnace chamber 3. The insulation layer 2 is located inside the furnace body 1, and the furnace chamber 3 is located inside the insulation layer 2. The furnace body 1 is made of steel plate, the insulation layer 2 is made of refractory asbestos, and the furnace chamber 3 is made of zirconium oxide; these are existing technologies and will not be described in detail. An oxyhydrogen burner 9 is installed at the feed inlet at the upper end of the furnace chamber 3, and a forming channel 11 is provided at the lower end of the furnace chamber 3, allowing a drawing machine to slowly draw out the quartz ingots formed within the forming channel 11. This utility model mainly describes the flashback prevention device; therefore, the specific structure and working process of the furnace will not be described in detail.

[0016] In a preferred embodiment, the insulation layer 2 is provided with an annular flue 4 extending into the inner cavity of the furnace 3. The upper end of the annular flue 4 is connected to a chimney 5. The high-temperature flue gas in the furnace 3 is discharged through the annular flue 4 and from the chimney 5, thereby ensuring the stability of the temperature and pressure inside the furnace 3. At this time, the furnace 3 is provided with an emergency flue 7 extending to the outside of the furnace body 1. The portion of the emergency flue 7 located above the furnace body 1 is equipped with a solenoid valve 8. The solenoid valve 8 is made of a high-temperature resistant material. The emergency flue 7 remains closed under normal furnace operation, and high-temperature flue gas does not pass through the emergency flue 7. Both the emergency flue 7 and the chimney 5 are connected to an exhaust fan 6. The exhaust fan 6 is used to discharge the high-temperature flue gas in the furnace 3 from the emergency flue 7 and the chimney 5. Several pressure sensors 10 are provided inside the furnace 3. The pressure sensors 10 are electrically connected to the exhaust fan 6 and the solenoid valve 8.

[0017] When the high-temperature flue gas in the furnace 3 is not discharged in time, causing the pressure in the furnace 3 to be too high, the pressure sensor 10 detects that the pressure is too high. The control system can automatically open the solenoid valve 8, and the emergency flue 7 is connected to the exhaust fan 6. The high-temperature flue gas can be discharged directly from the emergency flue 7, avoiding the hydrogen-oxygen flame backfire phenomenon caused by excessive pressure in the furnace 3.

[0018] like Figure 2 As shown, in a preferred embodiment, the oxyhydrogen burner 9 includes a hydrogen chamber 902 and an oxygen chamber 901 containing a plurality of wick tubes 903. Both the oxygen chamber 901 and the hydrogen chamber 902 are connected to an existing gas supply system. Quartz powder enters the oxygen chamber 901 through a quartz feed pipe, mixes with oxygen, and then enters evenly through each wick tube 903. The feeding method of the quartz powder is existing technology and will not be described in detail. At this time, a one-way valve 904 is axially installed on the wick tube 903 to prevent backflow of oxygen and flame, thus avoiding combustion in the inner cavity of the oxyhydrogen burner 9.

[0019] In a preferred embodiment, the oxyhydrogen burner 9 is connected to a nozzle plate 15 that sprays inert gas into the outlet of the oxyhydrogen burner 9. The nozzle plate 15 is connected to multiple nozzles, which can uniformly spray inert gas into the outlet of the oxyhydrogen burner 9. The inert gas blocks the outlet of the oxyhydrogen burner 9, further preventing the oxyhydrogen flame backfire phenomenon, preventing combustion in the inner cavity of the oxyhydrogen burner, and ensuring the safe use of the oxyhydrogen burner.

[0020] At this time, a pressure equalization chamber 14, which is connected to the nozzle plate 15, is fixedly connected to the outer wall of the oxy-hydrogen burner 9. Both the pressure equalization chamber 14 and the nozzle plate 15 are made of high-temperature resistant alloy material. The pressure equalization chamber 14 is connected to a vent pipe 13 that penetrates the hydrogen chamber 902. The vent pipe 13 extends to the outside of the oxy-hydrogen burner 9 and is connected to an inert gas connection end 12. High-pressure inert gas can enter the vent pipe 13 and the pressure equalization chamber 14 from the inert gas connection end 12, and the high-pressure inert gas is sprayed from the nozzle plate 15 to the outlet of the oxy-hydrogen burner 9, which can block the outlet of the oxy-hydrogen burner 9 and prevent the oxy-hydrogen flame backfire phenomenon. It should be noted that the nozzle plate 15 is set along one side of the outlet of the oxy-hydrogen burner 9, and the length of the nozzle plate 15 is greater than the diameter of the outlet of the oxy-hydrogen burner 9, so that the outlet of the oxy-hydrogen burner 9 can be completely covered.

[0021] 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 flashback prevention device for an oxyhydrogen flame furnace, comprising a furnace body (1), an insulation layer (2), and a furnace chamber (3), wherein an oxyhydrogen burner (9) is installed at the upper end of the furnace chamber (3) and a forming channel (11) is provided at the lower end of the furnace chamber (3), characterized in that: The insulation layer (2) is provided with an annular flue (4) that extends into the inner cavity of the furnace (3) and is connected to a chimney (5). The furnace (3) is provided with an emergency flue (7) that extends to the outside of the furnace body (1) and is equipped with a solenoid valve (8). The emergency flue (7) and the chimney (5) are both connected to a blower (6). The hydrogen-oxygen burner (9) is connected with a nozzle plate (15) that sprays inert gas to the outlet of the hydrogen-oxygen burner (9).

2. The anti-backfire device for an oxyhydrogen flame furnace according to claim 1, characterized in that: The hydrogen-oxygen burner (9) includes a hydrogen chamber (902) and an oxygen chamber (901) containing a plurality of wick tubes (903), wherein a one-way valve (904) is axially mounted on the wick tubes (903).

3. The anti-backfire device for an oxyhydrogen flame furnace according to claim 2, characterized in that: The outer wall of the hydrogen-oxygen burner (9) is fixedly connected to a pressure equalization chamber (14) connected to the nozzle plate (15). The pressure equalization chamber (14) is connected to a vent pipe (13) that penetrates the hydrogen chamber (902). The vent pipe (13) extends to the outside of the hydrogen-oxygen burner (9) and is connected to an inert gas connection end (12).

4. The anti-backfire device for an oxyhydrogen flame furnace according to claim 3, characterized in that: Both the equalizing chamber (14) and the jet nozzle plate (15) are made of high-temperature resistant alloy materials.

5. The anti-backfire device for an oxyhydrogen flame furnace according to claim 1, characterized in that: The nozzle plate (15) is disposed along one side of the outlet of the hydrogen-oxygen burner (9), and the length of the nozzle plate (15) is greater than the diameter of the outlet of the hydrogen-oxygen burner (9).

6. The anti-backfire device for an oxyhydrogen flame furnace according to claim 1, characterized in that: The furnace (3) is equipped with several pressure sensors (10), which are electrically connected to the air pump (6) and the solenoid valve (8).

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