A premix burner for a float glass furnace to prevent spontaneous breakage

Abstract

The utility model belongs to the technical field of combustion equipment, concretely relates to a float glass anti -self -explosion's melting furnace premixing formula combustor. This kind of float glass anti -self -explosion's melting furnace premixing formula combustor includes premixing device, and premixing device sets up between fuel passage and feed pipe, including premixing cylinder and first air inlet pipe, premixing cylinder inside is provided with premixing chamber, and premixing chamber first end is linked with fuel passage, and feed pipe is linked with premixing chamber second end, and premixing chamber is supplied with fuel, first air inlet pipe is connected with premixing cylinder, and compressed gas is transported in premixing chamber. Make fuel and compressed gas in premixing chamber first preliminary mixture, again mix compressed gas that enters nozzle and gas passage delivery again through fuel passage, increase the contact area of fuel particle and combustion-supporting wind in melting furnace, make fuel more fully burn, actual flame clear and powerful, present columnar type, and combustion is stable, greatly improved fuel burnout rate and reduced the generation of harmful ash.

Description

Technical Field

[0001] This utility model belongs to the field of combustion equipment technology, specifically relating to a premixed burner for a float glass melting furnace that is resistant to spontaneous explosion. Background Technology

[0002] In the float glass production process, spontaneous glass breakage is the most frequent quality issue causing customer complaints. The main cause of spontaneous glass breakage is the NiS content in the glass, which leads to defects such as stones and bubbles. Petroleum coke fuel is the main source of Ni introduced into the petroleum coke production line and affects the quality of flame combustion. However, most current float glass petroleum coke production lines use a burner method where fuel is delivered from an inner pipe and compressed air from an outer pipe to a cyclone separator at the front end of the burner for short-term mixing before being injected into the melting furnace for combustion. This method does not disperse the fuel particles beforehand, resulting in incomplete combustion, a weak and cloudy flame, poor atomization, low burnout rate, and a large amount of harmful ash produced during combustion.

[0003] Meanwhile, existing burners cause several problems: First, unburned fuel adheres to the glass surface of the melting furnace, increasing the Ni content of the glass and directly increasing the spontaneous breakage rate. Second, unburned fuel adheres to the furnace bricks, reacting with them and corroding them, affecting their service life and causing stone-like defects. Third, after entering the regenerator, the fuel reacts with the magnesia bricks, causing them to pulverize and fall off, clogging the grid and affecting the furnace's "breathing," resulting in poor flue gas emission, unstable furnace pressure, and an increase in bubble-like defects on the glass surface, thus affecting glass quality. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a premixed burner for float glass furnaces that improves fuel premixing, enhances the flame of petroleum coke fuel, and increases the fuel burnout rate, thus preventing spontaneous explosion.

[0005] The present invention adopts the following technical solution:

[0006] A premixed burner for a float glass melting furnace to prevent spontaneous breakage includes a combustion lance body, a feed pipe, and a nozzle. The combustion lance body includes a fuel channel and a gas channel, with the gas channel surrounding the fuel channel. The feed pipe supplies fuel to the fuel channel. The nozzle is located at the front end of the combustion lance body, allowing the incoming fuel to mix with compressed gas and then be ejected outwards. The burner also includes a premixing device located between the fuel channel and the feed pipe. This premixing device includes a premixing cylinder and a first air inlet pipe. The premixing cylinder contains a premixing chamber. A first end of the premixing chamber is connected to the fuel channel, and the feed pipe is connected to a second end of the premixing chamber, supplying fuel to the premixing chamber. The first air inlet pipe is connected to the premixing cylinder, delivering compressed gas into the premixing chamber, allowing the fuel and compressed gas to be initially mixed in the premixing chamber before entering the nozzle through the fuel channel and mixing again with the compressed gas delivered through the gas channel.

[0007] Furthermore, a buffer section is provided on the premixing cylinder, the buffer section is connected to the second end of the premixing chamber, and the feed pipe is connected to the buffer section.

[0008] Furthermore, the first intake pipe is inclinedly connected to the buffer section.

[0009] Furthermore, the premixing chamber includes an inlet section, a mixing section, and a discharge section arranged sequentially along the fuel conveying direction. The inner diameter of the inlet section gradually increases along the fuel conveying direction, and the discharge section gradually decreases along the fuel conveying direction.

[0010] Furthermore, the combustion gun body also includes a second air inlet pipe, which is connected to a gas channel to supply compressed gas to the gas channel.

[0011] Furthermore, the nozzle includes an air cap and a swirler. The air cap is detachably connected to the combustion gun body, and the swirler is embedded in the front end of the combustion gun body. After the air cap is connected to the combustion gun body, the swirler is pressed against the front end of the combustion gun body by the air cap.

[0012] Furthermore, the wind cap is provided with a mixing channel, and the cyclone is provided with a feed channel and an air intake channel. The mixing channel is connected to the second end of the feed channel, and the first end of the feed channel is connected to the fuel channel. The mixing channel is connected to the second end of the feed channel. The first end of the air intake channel is connected to the gas channel, and the mixing channel is connected to the second end of the air intake channel.

[0013] Furthermore, the cyclone separator includes a main body section and a plurality of inclined guide blocks spaced apart on the outer periphery of the main body section, with the air intake channel formed between two adjacent guide blocks.

[0014] Furthermore, the main body section can be embedded in the combustion gun body, the thickness of the guide block gradually decreases along the fuel delivery direction, and the wind cap is provided with an extension section that abuts against the guide block.

[0015] Furthermore, the wind cap is provided with an internal thread, and the outer periphery of the combustion gun body is provided with an external thread that mates with the internal thread.

[0016] As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are as follows: By defining the specific structure of the premixing device, the present application adds a step of premixing compressed air to the combustion gun body. In use, the fuel entering the fuel channel through the feed pipe and the compressed air entering the premixing chamber through the first air inlet pipe are first premixed in the premixing chamber to enhance the dispersion of fuel particles. Then, the fuel is transported to the nozzle at the front end of the combustion gun body and mixed with the compressed gas again before being sprayed into the furnace for combustion. This increases the contact area between the fuel particles and the combustion air in the furnace, making the fuel burn more completely. The actual flame is bright and powerful, columnar in shape, and the combustion is stable, which greatly improves the fuel burnout rate and reduces the generation of harmful ash.

[0017] The premixing device specified in this application can also reduce the adhesion of unburned petroleum coke fuel to the furnace bricks, prevent refractory materials from being eroded by flames, reduce the generation of stone-like defects, and help extend the service life of the furnace. It can also reduce the retention or adhesion of unburned petroleum coke fuel in the furnace or on the fuel and glass melt, thereby reducing bubble defects in the glass. It also greatly reduces the Ni content in the glass, reducing the nickel content in the glass from 13 ppm to the current 8 ppm, which is beneficial to improving the quality of the glass and thus significantly improving the spontaneous breakage rate of the glass, reducing the spontaneous breakage rate from 0.9% to the current 0.6%. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the burner gun body.

[0019] Figure 2 Schematic diagram of the exploded structure of a premixed burner Figure 1 .

[0020] Figure 3 Schematic diagram of the internal structure of a premixed burner Figure 1 .

[0021] Figure 4 Schematic diagram of the internal structure of a premixed burner Figure 2 .

[0022] Figure 5 This is a schematic diagram showing the combination of a premixed burner with fuel and compressed gas.

[0023] Figure 6 This is a diagram showing the actual flame combustion effect of an existing burner without a premixing device.

[0024] Figure 7 The image shows the actual flame effect of the burner as defined in this application.

[0025] In the diagram: 1. Combustion gun body; 11. Fuel passage; 12. Gas passage; 13. Sleeve; 14. Fixing bolt; 15. Internal thread; 16. External thread; 17. Second air inlet pipe; 2. Feed pipe; 3. Nozzle; 31. Air cap; 32. Swirl; 33. Mixing passage; 34. Feed passage; 35. Air inlet passage; 36. Main body section; 37. Guide block; 38. Extension section; 4. Premixing device; 41. Premixing cylinder; 42. First air inlet pipe; 43. Premixing chamber; 44. Buffer section; 45. Inlet section; 46. Mixing section; 47. Discharge section. Detailed Implementation

[0026] The present invention will be further described below through specific embodiments.

[0027] like Figures 1 to 5 As shown, this embodiment provides a premixed burner for float glass furnaces that is resistant to spontaneous explosion. It is made of low-carbon steel and includes a combustion gun body 1, a feed pipe 2, a nozzle 3, and a premixing device 4.

[0028] The combustion gun body 1 includes a fuel channel 11 and a gas channel 12, with the gas channel 12 surrounding the fuel channel 11. A feed pipe 2 supplies fuel to the fuel channel 11, and a nozzle 3 is located at the front end of the combustion gun body 1, causing the incoming fuel to mix with compressed gas and then be ejected outwards into the furnace for combustion. Specifically, the feed pipe 2 is inclinedly connected to the fuel channel 11, with an angle of 30 degrees between the feed pipe 2 and the combustion gun body 1. Furthermore, the combustion gun body 1 also includes a sleeve 13 movably mounted on the combustion gun body 1 and fixing bolts 14 mounted on the sleeve 13 that abut against the outer wall of the combustion gun body 1.

[0029] The nozzle 3 includes an air cap 31 and a cyclone separator 32. The air cap 31 is detachably connected to the combustion gun body 1. The cyclone separator 32 is embedded in the front end of the combustion gun body 1. After the air cap 31 is connected to the combustion gun body 1, the cyclone separator 32 is pressed against the front end of the combustion gun body 1 by the air cap 31. Specifically, the air cap 31 is provided with a mixing channel 33, and the cyclone separator 32 is provided with a feed channel 34 and an air intake channel 35. The mixing channel 33 is connected to the second end of the feed channel 34, and the first end of the feed channel 34 is connected to the fuel channel 11. The mixing channel 33 is connected to the second end of the feed channel 34. The first end of the air intake channel 35 is connected to the gas channel 12, and the second end of the mixing channel 33 is connected to the air intake channel 35. Further... The cyclone separator 32 includes a main body section 36 and a plurality of inclined guide blocks 37 spaced apart on the outer periphery of the main body section 36, with an air intake channel 35 formed between adjacent guide blocks 37. In use, the compressed gas in the gas channel 12 enters the mixing channel 33 through the plurality of air intake channels 35, forming a rotating airflow that promotes full mixing of fuel particles and compressed gas. Furthermore, the main body section 36 can be embedded in the combustion gun body 1, the thickness of the guide blocks 37 gradually decreases along the fuel delivery direction, and the air cap 31 is provided with an extension section 38 that abuts against the guide blocks 37. Furthermore, the air cap 31 is provided with an internal thread portion 15, and the outer periphery of the combustion gun body 1 is provided with an external thread portion 16 that mates with the internal thread portion 15.

[0030] A premixing device 4, disposed between the fuel channel 11 and the feed pipe 2, includes a premixing cylinder 41 and a first air inlet pipe 42. The premixing cylinder 41 contains a premixing chamber 43. The first end of the premixing chamber 43 is connected to the fuel channel 11, and the feed pipe 2 is connected to the second end of the premixing chamber 43, supplying fuel to the premixing chamber 43. The first air inlet pipe 42 is connected to the premixing cylinder 41, supplying compressed gas into the premixing chamber 43, allowing the fuel and compressed gas to be initially mixed in the premixing chamber 43, and then entering the nozzle 3 through the fuel channel 11 to be mixed again with the compressed gas supplied by the gas channel 12. The combustion gun body 1 also includes a second air inlet pipe 17. The second air inlet pipe 17 is connected to the gas channel 12 and supplies compressed gas to the gas channel 12. Specifically, the premixing cylinder 41 is provided with a buffer section 44, which is connected to the second end of the premixing chamber 43, and the feed pipe 2 is connected to the buffer section 44. The first air inlet pipe 42 is inclinedly connected to the buffer section 44. The angle between the first air inlet pipe 42 and the combustion gun body 1 is 45°. Further, the premixing chamber 43 includes an inlet section 45, a mixing section 46 and an outlet section 47 arranged sequentially along the fuel conveying direction. The inner diameter of the inlet section 45 gradually increases along the fuel conveying direction, and the outlet section 47 gradually decreases along the fuel conveying direction.

[0031] The working principle of this application is as follows:

[0032] After this application is implemented, fuel with a mesh size of ≥95% enters the premixing chamber 43 through the feed pipe 2. The first air inlet pipe 42 supplies compressed air with a pressure of 400 kPa into the premixing chamber 43. The fuel and compressed air are initially mixed in the premixing chamber 43, which plays a good role in suppressing flame ignition and contraction.

[0033] After implementation of this application, the fuel entering the fuel channel 11 through the feed pipe 2 and the compressed air entering the premixing chamber 43 through the first air inlet pipe 42 are first premixed in the premixing chamber 43 to enhance the dispersion of fuel particles. Then, the compressed gas is transported to the nozzle 3 at the front end of the combustion gun body 1 for further mixing before being injected into the furnace for combustion. This increases the contact area between the fuel particles and the combustion air in the furnace, making the fuel burn more completely. For details, refer to... Figure 6 and Figure 7 As shown, the burner used in this application has a clear and powerful flame, is columnar in shape, and burns stably, which greatly improves the fuel burnout rate and reduces the generation of harmful ash; and the heat consumption can be reduced from 1289 kcal / kg.G to the current 1278 kcal / kg.G.

[0034] After implementation, this application can significantly reduce the adhesion of unburned fuel to the furnace bricks, prevent refractory materials from being eroded by flames, and reduce the generation of stone-like defects. It can also reduce the retention or adhesion of unburned fuel in the furnace to the fuel and molten glass, which not only reduces bubble defects in the glass but also significantly reduces the Ni content in the glass, reducing the nickel content from 13 ppm to the current 8 ppm. This is beneficial to improving glass quality and thus significantly improving the spontaneous breakage rate of the glass, reducing the spontaneous breakage rate from 0.9% to the current 0.6%.

[0035] The first intake pipe 42 and the second intake pipe 17 of this application are connected by a T-joint and a ball valve, which can adjust the amount of compressed gas entering the premixing chamber 43, with an adjustment range of 80-120 m³ / h. During use, adjustments should be made according to the actual flame combustion state. If the flame is cloudy and weak, the compressed gas flow rate can be increased by 10-20 m³ / h; if the flame is too bright, the compressed gas flow rate can be decreased by 10-20 m³ / h.

[0036] The specific dimensions of this application are as follows:

[0037] (1) The length of the combustion gun body 1 is 770mm, the inner diameter of the fuel channel 11 is 24mm, and the inner diameter of the gas channel 12 is 38mm.

[0038] (2) The feed pipe 2 and the combustion gun body 1 form a 30° angle. The outer diameter of the feed pipe 2 is 32mm, the thickness is 2mm, and the length is 80mm. Its end can be connected to a DN25 quick connector.

[0039] (3) The length of the wind cap 31 is 70mm, the outer diameter of the wind cap 31 is 55mm, the inner diameter of the mixing channel 33 is 29mm; the length of the hydrocyclone 32 is 40mm, the distance between two adjacent guide blocks 38 is 3mm, the tilt angle of the guide block 38 is 10°, and the inner diameter of the feed channel 34 is 24mm.

[0040] (4) The first air inlet pipe 42 is at a 45° angle to the combustion gun body 1. Its outer diameter is 25mm, its thickness is 2mm, and its length is 80mm. Its end can be connected to a DN25 quick connector. The first air inlet pipe 42 and the second air inlet pipe 17 have the same size. The first air inlet pipe 42 is 70mm away from the tail end of the combustion gun body 1, and the second air inlet pipe 17 is 250mm away from the tail end of the combustion gun body.

[0041] (5) The premixing cylinder 41 has an outer diameter of 74 mm and a length of 120 mm. The mixing section 46 has a length of 80 mm and the discharge section 47 has a length of 40 mm.

[0042] The dimensions of this application are not limited to those described above.

[0043] The above description is merely a preferred embodiment of the present utility model, and therefore cannot be construed as limiting the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present utility model application and the contents of the specification should still fall within the scope of the present utility model application.

Claims

1. A premixed burner for a float glass melting furnace to prevent spontaneous breakage, comprising a combustion lance body, a feed pipe, and a nozzle, wherein the combustion lance body includes a fuel channel and a gas channel, the gas channel being arranged around the fuel channel; the feed pipe supplies fuel to the fuel channel; the nozzle is disposed at the front end of the combustion lance body, so that the incoming fuel is mixed with compressed gas and then ejected outward, characterized in that: It also includes a premixing device, which is disposed between the fuel channel and the feed pipe. The premixing device includes a premixing cylinder and a first air inlet pipe. The premixing cylinder is provided with a premixing chamber. The first end of the premixing chamber is connected to the fuel channel, and the feed pipe is connected to the second end of the premixing chamber to supply fuel to the premixing chamber. The first air inlet pipe is connected to the premixing cylinder to deliver compressed gas into the premixing chamber, so that the fuel and compressed gas are initially mixed in the premixing chamber, and then enter the nozzle through the fuel channel to be mixed again with the compressed gas delivered by the gas channel.

2. The premixed burner for float glass furnace with anti-spontaneous explosion capability according to claim 1, characterized in that: The premixing cylinder is provided with a buffer section, which is connected to the second end of the premixing chamber, and the feed pipe is connected to the buffer section.

3. The premixed burner for float glass furnace with anti-spontaneous explosion capability according to claim 2, characterized in that: The first air intake pipe is inclinedly connected to the buffer section.

4. The premixed burner for float glass furnace with anti-spontaneous explosion as described in claim 1, characterized in that: The premixing chamber includes an inlet section, a mixing section, and an outlet section arranged sequentially along the fuel conveying direction. The inner diameter of the inlet section gradually increases along the fuel conveying direction, and the outlet section gradually decreases along the fuel conveying direction.

5. A premixed burner for float glass furnace with anti-spontaneous explosion capability according to claim 1, characterized in that: The combustion gun body also includes a second air inlet pipe, which is connected to a gas passage and supplies compressed gas to the gas passage.

6. A premixed burner for float glass furnaces resistant to spontaneous explosion according to claim 1, characterized in that: The nozzle includes an air cap and a swirler. The air cap is detachably connected to the combustion gun body. The swirler is embedded in the front end of the combustion gun body. After the air cap is connected to the combustion gun body, the swirler is pressed against the front end of the combustion gun body by the air cap.

7. A premixed burner for float glass furnaces resistant to spontaneous explosion according to claim 6, characterized in that: The wind cap is provided with a mixing channel, and the cyclone is provided with a feed channel and an air intake channel. The mixing channel is connected to the second end of the feed channel, and the first end of the feed channel is connected to the fuel channel. The mixing channel is connected to the second end of the feed channel. The first end of the air intake channel is connected to the gas channel, and the mixing channel is connected to the second end of the air intake channel.

8. A premixed burner for float glass furnaces resistant to spontaneous explosion according to claim 7, characterized in that: The cyclone separator includes a main body section and a plurality of inclined guide blocks spaced apart on the outer periphery of the main body section, with the air intake channel formed between two adjacent guide blocks.

9. A premixed burner for float glass furnaces resistant to spontaneous explosion according to claim 8, characterized in that: The main body section can be embedded in the combustion gun body, the thickness of the guide block gradually decreases along the fuel delivery direction, and the wind cap is provided with an extension section that abuts against the guide block.

10. A premixed burner for float glass furnace to prevent spontaneous breakage according to claim 6, characterized in that: The wind cap is provided with an internal thread, and the outer periphery of the combustion gun is provided with an external thread that mates with the internal thread.

Images