Edge fire gun system of plate glass annealing kiln

Abstract

The utility model relates to the technical field of glass production, in particular to an edge fire gun system of a plate glass annealing kiln. The device comprises an inner pipe assembly and an outer pipe assembly arranged on the outer side of the inner pipe assembly in a sleeving mode. The outer pipe assembly comprises a gas outer pipe pipeline, and a gas inlet of the gas outer pipe pipeline is connected with a natural gas input pipe. A first flared cavity is formed in a gas outlet of the gas outer pipeline; the inner pipe assembly comprises an energy-saving inner pipe pipeline, an air inlet of the energy-saving inner pipe pipeline is connected with an exhaust pipeline of a high-temperature area of the flat glass annealing kiln through a heat-resistant steel seamless pipe, and an air outlet of the energy-saving inner pipe pipeline is provided with a second flaring cavity arranged in the first flaring cavity in a sleeved mode. The novel edge fire gun heating system has the advantages that waste heat high-temperature air emptied by an annealing kiln is collected and recycled and is utilized on the edge of an edge fire gun heating glass plate, and the novel edge fire gun heating system with the waste heat high-temperature air as main heating energy and natural gas or oil as supplementary auxiliary energy is formed.

Description

Technical Field

[0001] The utility model relates to the technical field of glass production, in particular to a side ignition gun system of a flat glass annealing furnace. Background Art

[0002] During the production of flat glass, especially the stable production and precise control of thick and extra-thick float glass, such as those with thicknesses of 10mm, 12mm, 15mm, 19mm, 22mm, 25mm, and above, the smooth edge of the glass is thinner than the center, and the smooth edge itself contains less heat, dissipates heat faster, and has a lower temperature. This results in a large temperature difference, which can easily lead to problems such as edge chipping, cracking, and poor cutting. Therefore, the commonly used method both domestically and internationally is to use natural gas to heat the annealing lehr and its outlet through edge torches to supplement heat, raise the temperature, and maintain uniform temperature along the smooth edge and the lateral temperature of the glass sheet. This prevents cracking, edge chipping, or poor cutting caused by low edge temperature, thus avoiding unnecessary production losses.

[0003] Among existing technologies, the "Sidelight Gun Bracket and Device," developed by He Hailong and others at Hebei Nanbo Company of China Southern Glass Group (patent number ZL201821014114.1), boasts novel conception, ingenious design, unique and practical form, and practical value. However, this patented technology only improves and innovates the sidelight gun bracket and does not address deeper technical issues such as energy conservation, waste heat utilization, carbon emission reduction, and environmental protection. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an energy-saving side lance system for a flat glass annealing furnace.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: providing a side ignition system for a flat glass annealing furnace, comprising a side ignition system body, the side ignition system body being used to heat the edge of the flat glass, the side ignition system body comprising an inner tube assembly and an outer tube assembly sleeved outside the inner tube assembly;

[0006] The outer pipe assembly includes a gas outer pipe, and the gas inlet of the gas outer pipe is connected to the natural gas input pipe;

[0007] The inner tube assembly includes an energy-saving inner tube pipeline, and the air inlet of the energy-saving inner tube pipeline is connected to the exhaust pipe of the high-temperature zone of the flat glass annealing furnace.

[0008] Furthermore, in the side ignition gun system of the above-mentioned flat glass annealing furnace, the air inlet of the energy-saving inner tube is connected to the exhaust pipe of the high temperature zone of the flat glass annealing furnace through a heat-resistant steel seamless pipe, and the outer surface of the heat-resistant steel seamless pipe is provided with an insulation layer.

[0009] Furthermore, in the side ignition system of the flat glass annealing furnace, the gas outlet of the outer gas pipe is provided with a first expansion cavity; the gas outlet of the energy-saving inner pipe is provided with a second expansion cavity which is sleeved inside the first expansion cavity.

[0010] Furthermore, in the above-mentioned side lance system of the flat glass annealing furnace, the first expansion cavity includes a first natural gas cavity and a second natural gas cavity with gradually increasing radial cross-sectional areas; a natural gas partition is provided between the first natural gas cavity and the second natural gas cavity, and a gas through hole is provided on the natural gas partition; a combustion nozzle is provided on the free end of the second natural gas cavity, and the gas through hole and the combustion nozzle are arranged crosswise and non-correspondingly.

[0011] Furthermore, in the above-mentioned side ignition gun system of the flat glass annealing furnace, the second expansion cavity includes a first high-temperature air cavity, a first high-temperature air pressure-stabilizing chamber and a second high-temperature air pressure-stabilizing chamber, the radial cross-sectional area of ​​which gradually increases; a first partition is provided between the first high-temperature air cavity and the first high-temperature air pressure-stabilizing chamber, a second partition is provided between the first high-temperature air pressure-stabilizing chamber and the second high-temperature air pressure-stabilizing chamber, and high-temperature air through holes are respectively provided on the first partition and the second partition, and the through holes on the first partition and the second partition are arranged asymmetrically.

[0012] Furthermore, in the side lance system of the flat glass annealing furnace, the apertures of the gas through hole and the combustion nozzle are both 1-3 mm, and the aperture of the high-temperature air through hole is 2-5 mm.

[0013] Furthermore, in the side lance system of the flat glass annealing furnace, the outer gas pipe is provided with a natural gas pressure gauge, a flow meter and a solenoid valve.

[0014] Furthermore, in the side ignition gun system of the above-mentioned flat glass annealing furnace, a high-temperature gas pressure gauge, a high-temperature gas mass flow meter, a temperature sensor and a high-temperature electromagnetic needle valve are provided at one end of the heat-resistant steel seamless pipe close to the exhaust pipe.

[0015] The beneficial effects of this utility model lie in: To address the problems of rapid cooling and large temperature differences at the edges of flat glass during production, which can lead to plate blasting, edge chipping, and poor cutting, this utility model creatively collects and recycles the waste heat and high-temperature air exhausted from the annealing lehr and utilizes it to heat the edges of the glass sheets with edge torches. This creates a novel edge torch heating system that uses waste heat and high-temperature air as the primary heating energy source, supplemented by natural gas or oil. Specific innovations are as follows: 1. High-temperature air (480-600°C) exhausted from the annealing lehr's high-temperature zone is recycled and reused as the edge torch heating energy source, conserving fossil energy and reducing carbon emissions. This not only recycles waste heat, conserves non-renewable fossil energy, and protects the environment. 2. A double-layer, internal-external hybrid heating method has been creatively developed, utilizing high-temperature waste heat air as the primary heating source, supplemented by natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the relevant structure of a side ignition system of a flat glass annealing furnace according to a specific embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the relevant structure of a side ignition system of a flat glass annealing furnace according to a specific embodiment of the utility model;

[0018] Description of labels:

[0019] 1. Flat glass annealing lehr; 11. Flat glass; 2. Exhaust duct;

[0020] 3. Heat-resistant steel seamless pipe; 31. High-temperature gas pressure gauge; 32. High-temperature gas mass flow meter; 33. Temperature sensor; 34. High-temperature electromagnetic needle valve;

[0021] 4. The rimfire gun body;

[0022] 41. Outer tube assembly; 411. First expansion cavity; 412. First natural gas cavity; 413. Second natural gas cavity; 414. Natural gas partition; 415. Natural gas pressure gauge; 416. Flow meter; 417. Solenoid valve;

[0023] 42. Inner tube assembly; 421. Second expansion cavity; 422. First high-temperature air cavity; 423. First high-temperature air plenum; 424. Second high-temperature air plenum;

[0024] 5. Infrared temperature measuring instrument. DETAILED DESCRIPTION

[0025] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

[0026] The utility model provides a side ignition gun system for a flat glass annealing furnace, comprising a side ignition gun body, wherein the side ignition gun body is used to heat the edge of the flat glass, and the side ignition gun body comprises an inner tube assembly and an outer tube assembly sleeved on the outer side of the inner tube assembly;

[0027] The outer pipe assembly includes a gas outer pipe, and the gas inlet of the gas outer pipe is connected to the natural gas input pipe;

[0028] The inner tube assembly includes an energy-saving inner tube pipeline, and the air inlet of the energy-saving inner tube pipeline is connected to the exhaust pipe of the high-temperature zone of the flat glass annealing furnace.

[0029] The beneficial effects of this utility model are as follows: 1. It recycles the waste high-temperature air (480-600°C) from the high-temperature zone of the emptied flat glass annealing lehr as a heating energy source for the side burners, saving fossil energy and reducing carbon emissions. This not only recycles waste heat, but also conserves non-renewable fossil energy and protects the environment. 2. It creatively develops a double-layer, internal and external hybrid heating method using a combination of high-temperature waste heat air as the primary heating source and natural gas as the supplementary heating source. Specifically:

[0030] The glass plate exchanges energy with the medium of hot air circulation in the annealing furnace area A, and the waste hot air generated is discharged to the outside through the annealing furnace fan with a temperature of about 480℃-600℃. The exhaust duct in the annealing furnace area A is opened near the top of the factory building upstream and connected to the heat-insulating heat-resistant steel seamless pipe used to transport the waste high-temperature air of the side ignition gun system. The centrifugal fan variable frequency control is used to adjust the air intake. Temperature sensors, wind pressure gauges, flow meters, true valves and PLC control methods are installed near the air intake to achieve the required temperature and the amount of heat energy supplied to the side ignition gun.

[0031] A temperature sensor is set at the edge of the glass plate near the edge blaster. According to the temperature changes, the size of the natural gas or oil switch required to supplement the edge blaster temperature is automatically calculated to ensure the consistency of the glass edge temperature and the horizontal temperature of the plate surface.

[0032] Furthermore, in the side ignition gun system of the above-mentioned flat glass annealing furnace, the air inlet of the energy-saving inner tube is connected to the exhaust pipe of the high temperature zone of the flat glass annealing furnace through a heat-resistant steel seamless pipe, and the outer surface of the heat-resistant steel seamless pipe is provided with an insulation layer.

[0033] As can be seen from the above description, providing an insulation layer can further save energy.

[0034] Furthermore, in the side ignition system of the flat glass annealing furnace, the gas outlet of the outer gas pipe is provided with a first expansion cavity; the gas outlet of the energy-saving inner pipe is provided with a second expansion cavity which is sleeved inside the first expansion cavity.

[0035] Furthermore, in the above-mentioned side lance system of the flat glass annealing furnace, the first expansion cavity includes a first natural gas cavity and a second natural gas cavity with gradually increasing radial cross-sectional areas; a natural gas partition is provided between the first natural gas cavity and the second natural gas cavity, and a gas through hole is provided on the natural gas partition; a combustion nozzle is provided on the free end of the second natural gas cavity, and the gas through hole and the combustion nozzle are arranged crosswise and non-correspondingly.

[0036] Furthermore, in the above-mentioned side ignition gun system of the flat glass annealing furnace, the second expansion cavity includes a first high-temperature air cavity, a first high-temperature air pressure-stabilizing chamber and a second high-temperature air pressure-stabilizing chamber, the radial cross-sectional area of ​​which gradually increases; a first partition is provided between the first high-temperature air cavity and the first high-temperature air pressure-stabilizing chamber, a second partition is provided between the first high-temperature air pressure-stabilizing chamber and the second high-temperature air pressure-stabilizing chamber, and high-temperature air through holes are respectively provided on the first partition and the second partition, and the through holes on the first partition and the second partition are arranged asymmetrically.

[0037] As can be seen from the above description, this utility model innovatively develops a side-fire lance system that utilizes a cannulated energy supply. Five mixing chambers are located within the nozzle, ensuring stable flame and waste high-temperature air temperatures, resulting in optimal heating conditions. This advantageously reduces energy waste, promotes waste heat recovery, and contributes positively to carbon emissions.

[0038] Furthermore, in the side lance system of the flat glass annealing furnace, the apertures of the gas through hole and the combustion nozzle are both 1-3 mm, and the aperture of the high-temperature air through hole is 2-5 mm.

[0039] Furthermore, in the side lance system of the flat glass annealing furnace, the outer gas pipe is provided with a natural gas pressure gauge, a flow meter and a solenoid valve.

[0040] From the above description, we can see that the natural gas pressure gauge, flow meter and needle solenoid valve are electrically connected to the control cabinet PLC to achieve precise control of opening and closing and flow adjustment, etc., to meet the needs of the glass edge temperature and the amount of heat energy supply.

[0041] An infrared temperature sensor is installed at the edge of the glass plate, which communicates with the upstream glass edge temperature data monitoring system. According to the temperature changes, it automatically calculates and adjusts the size of the natural gas switch needed to supplement the edge ignition temperature, thereby ensuring the consistency of the glass edge temperature and the horizontal temperature of the plate surface.

[0042] Furthermore, in the side ignition gun system of the above-mentioned flat glass annealing furnace, a high-temperature gas pressure gauge, a high-temperature gas mass flow meter, a temperature sensor and a high-temperature electromagnetic needle valve are provided at one end of the heat-resistant steel seamless pipe close to the exhaust pipe.

[0043] From the above description, we can see that the high-temperature gas pressure gauge, high-temperature gas mass flow meter and high-temperature electromagnetic needle valve are electrically connected to the control cabinet PLC to achieve precise control of opening and closing and flow adjustment, etc., to meet the purpose of how high the glass edge temperature is and how much heat energy is supplied.

[0044] Example 1

[0045] The application scenario of this embodiment is: in the existing flat glass 11 production process, there is a lack of waste heat from the high temperature zone of the flat glass annealing furnace 1 for recycling. This embodiment provides a side fire gun system for the flat glass annealing furnace, which uses a mixed heating mode of high-temperature waste heat air from the high temperature zone of the flat glass annealing furnace 1 as the main method and natural gas as the auxiliary method to heat the edge of the flat glass.

[0046] See also Figure 1-2 The edge ignition system of the flat glass annealing furnace of this embodiment includes an edge ignition body 4, which is used to heat the edge of the flat glass. The edge ignition body 4 includes an inner tube assembly 42 and an outer tube assembly 41 sleeved outside the inner tube assembly 42;

[0047] The outer pipe assembly 41 includes a gas outer pipe, the gas inlet of which is connected to the natural gas input pipe; the gas outlet of the gas outer pipe is provided with a first expansion cavity 411;

[0048] The inner tube assembly 42 includes an energy-saving inner tube pipeline, the air inlet of the energy-saving inner tube pipeline is connected to the exhaust pipe 2 in the high temperature zone of the flat glass annealing furnace 1 through a heat-resistant steel seamless pipe 3, and the air outlet of the energy-saving inner tube pipeline is provided with a second expansion cavity 421 which is sleeved inside the first expansion cavity 411.

[0049] A heat-resistant steel seamless pipe 3 with a diameter of 50-100mm and a wall thickness of 3-8mm for extracting hot air is welded on the exhaust duct 2 (temperature of 480-600℃) in the annealing furnace zone A (high temperature zone). One end of the pipe is welded to the exhaust pipe in the annealing furnace zone A, and the other end is led to the energy-saving inner pipe. The waste high-temperature air is exhausted and supplied by the centrifugal fan installed on the heat-resistant steel seamless pipe 3 under frequency conversion speed control.

[0050] The first expansion cavity 411 includes a first natural gas cavity 412 and a second natural gas cavity 413 with gradually increasing radial cross-sectional areas; a natural gas partition 414 is provided between the first natural gas cavity 412 and the second natural gas cavity 413, and a gas through hole is provided on the natural gas partition 414; a combustion nozzle is provided on the free end of the second natural gas cavity 413, and the gas through hole and the combustion nozzle are arranged in a cross asymmetric structure to stabilize the pressure and increase the impact force of the flame.

[0051] The second expansion cavity 421 includes a first high-temperature air cavity 422, a first high-temperature air pressure-stabilizing chamber 423, and a second high-temperature air pressure-stabilizing chamber 424, whose radial cross-sectional area gradually increases; a first partition is provided between the first high-temperature air cavity 422 and the first high-temperature air pressure-stabilizing chamber 423, and a second partition is provided between the first high-temperature air pressure-stabilizing chamber 423 and the second high-temperature air pressure-stabilizing chamber 424, and high-temperature air through holes are respectively provided on the first partition and the second partition.

[0052] Waste high-temperature air is introduced through the heat-resistant steel seamless pipe 3 and passes through the first high-temperature air chamber 422, the first high-temperature air plenum 423, and the second high-temperature air plenum 424 for homogenization, pressure stabilization, and pressure stabilization. Each layer of partitions acts as a buffer, homogenizer, pressure stabilizer, and pressure booster, preventing heat and temperature fluctuations. The waste high-temperature air is then directed toward the edge of the glass plate to heat the waste high-temperature air. The partitions have an aperture of 2-5 mm, and the apertures of each layer of partitions are asymmetrical, assisting in boosting, stabilizing, homogenizing, mixing, and stabilizing the pressure of the waste high-temperature air.

[0053] An infrared thermometer 5 is installed at the edge of the flat glass 11. If, due to the influence of glass thickness and room temperature, the waste high-temperature air cannot heat the glass edge sufficiently, the control cabinet's PLC automatically activates natural gas combustion heating to compensate for the insufficient waste heat. The natural gas is turned on, and after being boosted, stabilized, mixed, and homogenized in the first and second natural gas chambers 412 and 413, it is ejected through the combustion nozzle to heat the glass edge.

[0054] A high-temperature gas pressure gauge, a high-temperature gas mass flow meter, a temperature sensor, and a solenoid needle valve are mounted on the heat-resistant seamless steel pipe 3 near the exhaust pipe interface. These pressure gauge 31, mass flow meter 32, temperature sensor 33, and solenoid needle valve 34 are all electrically connected to the control cabinet. Heat-resistant seamless steel pipe 3 is insulated with thermal insulation to prevent heat loss caused by heat dissipation along the pipe. The insulation is secured with tinplate.

[0055] The energy-saving inner pipe is made of heat-resistant seamless steel pipe with a diameter of 30-60mm and a wall thickness of 3-5mm. The outer cavity of the energy-saving inner pipe serves as a natural gas passage. The outer gas pipe is made of heat-resistant seamless steel pipe with a diameter of 70-90mm and a wall thickness of 3-5mm. A natural gas pressure gauge 415, flow meter 416, and needle solenoid valve 417 are installed on the outer gas pipe. The control cabinet precisely controls the opening and closing of solenoid valve 417 and adjusts the flow rate.

[0056] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A side lance system for a flat glass annealing lehr, characterized in that: The edge ignition gun body is used to heat the edge of the flat glass. The edge ignition gun body includes an inner tube assembly and an outer tube assembly sleeved outside the inner tube assembly. The outer pipe assembly includes a gas outer pipe, and the gas inlet of the gas outer pipe is connected to the natural gas input pipe; The inner tube assembly includes an energy-saving inner tube pipeline, and the air inlet of the energy-saving inner tube pipeline is connected to the exhaust pipe of the high-temperature zone of the flat glass annealing furnace.

2. The side ignition system of the flat glass annealing lehr according to claim 1, characterized in that: The air inlet of the energy-saving inner pipe is connected to the exhaust pipe in the high temperature zone of the flat glass annealing furnace through a heat-resistant steel seamless pipe, and the outer surface of the heat-resistant steel seamless pipe is provided with an insulation layer.

3. The side ignition system of the flat glass annealing lehr according to claim 2, characterized in that: The gas outlet of the outer gas pipe is provided with a first expansion cavity; the gas outlet of the energy-saving inner pipe is provided with a second expansion cavity which is sleeved inside the first expansion cavity.

4. The side ignition system of the flat glass annealing lehr according to claim 3, characterized in that: The first expansion cavity includes a first natural gas cavity and a second natural gas cavity with gradually increasing radial cross-sectional areas; a natural gas partition is provided between the first natural gas cavity and the second natural gas cavity, and a gas through hole is provided on the natural gas partition; a combustion nozzle is provided on the free end of the second natural gas cavity, and the gas through hole and the combustion nozzle are arranged crosswise and non-correspondingly.

5. The side ignition system of the flat glass annealing lehr according to claim 4, characterized in that: The second expansion cavity includes a first high-temperature air cavity, a first high-temperature air plenum, and a second high-temperature air plenum, the radial cross-sectional area of ​​which gradually increases; a first partition is provided between the first high-temperature air cavity and the first high-temperature air plenum, and a second partition is provided between the first high-temperature air plenum and the second high-temperature air plenum, and high-temperature air through holes are respectively provided on the first partition and the second partition, and the through holes on the first partition and the second partition are arranged asymmetrically.

6. The side lance system of the flat glass annealing lehr according to claim 5, characterized in that: The apertures of the gas through hole and the combustion nozzle are both 1-3 mm, and the aperture of the high-temperature air through hole is 2-5 mm.

7. The side lance system of the flat glass annealing lehr according to claim 5, characterized in that: The outer gas pipe is provided with a natural gas pressure gauge, a flow meter and a solenoid valve.

8. The side lance system of the flat glass annealing lehr according to claim 5, characterized in that: The heat-resistant steel seamless pipe is provided with a high-temperature gas pressure gauge, a high-temperature gas mass flow meter, a temperature sensor and a high-temperature electromagnetic needle valve at one end close to the exhaust pipe.

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