Edge fire gun system of plate glass annealing kiln

Abstract

The invention relates to the technical field of glass production, in particular to an edge fire gun system of a plate glass annealing kiln, which comprises an inner tube assembly and an outer tube assembly sleeved on the outer side of the inner tube assembly, 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 side fire gun heating system has the beneficial effects that waste heat high-temperature air emptied by an annealing kiln is collected and recycled and is utilized on the side of a side fire gun heating glass plate, and the novel side 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 invention relates to the technical field of glass production, and 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 float glass and ultra-thick float glass products, such as the production of 10mm, 12mm, 15mm, 19mm, 22mm, 25mm and above thick glass and ultra-thick glass, the light edge of the glass plate is thinner than the middle part, and the light edge of the glass itself contains less heat, dissipates heat faster, and the temperature is low, resulting in a large temperature difference, which can easily cause problems such as edge drop, cracking and poor cutting. Therefore, the method commonly used at home and abroad is to use natural gas to heat the annealing furnace and its annealing furnace outlet through the edge torch to supplement the heat, increase the temperature, keep the temperature of the glass edge and the lateral temperature of the glass plate uniform, so as not to cause plate explosion, edge drop or poor cutting due to the low temperature of the light edge, and avoid unnecessary production losses.

[0003] Among the existing technologies, the patent number of "Side blaster bracket and device" developed by He Hailong and other teachers of Hebei Nanbo Company of China Nanbo Group is ZL201821014114.1. This patent technology is novel in conception, ingenious in design, unique and practical in shape, and has practical value. However, this patent technology only improves and innovates the side blaster bracket, and does not involve deep technical issues such as energy conservation and waste heat utilization, carbon emission reduction and environmental protection.

[0004] In the prior art, Mr. Liu Zian of Taiwan Glass South China Glass Co., Ltd. developed "A freely adjustable semi-automatic glass edge heating torch", with utility model patent number CN201962194U. This patented technology focuses on improving the adjustment method of the distance between the gun nozzle and the edge of the glass, aiming to drive the gun rod to move back and forth through motor transmission, so as to realize the electric adjustment of the distance between the flame and the edge of the glass. The size and strength of the flame can be controlled by adjusting the opening of the needle valve to adjust the amount of compressed air and liquefied petroleum gas. The above patented technology is ingeniously conceived and reasonably designed, which improves the automation and control level of the edge torch. However, the above patented technology also has the problem of not making innovative improvements to the heat supply energy, nor does it involve further discussion on the recycling of waste hot air from the annealing kiln.

[0005] In the existing technology, Li Maogang and other teachers of China National Building Materials (Yixing) New Energy Co., Ltd. jointly developed a "Photovoltaic Glass Edge Gun Device", utility model patent CN206709075U, which has a novel design, ingenious conception and good practical value. However, the above patent technology still uses natural gas as a single energy source for heating, and does not involve the recycling of waste hot air in the high temperature zone of the annealing kiln to heat the edge of the glass plate, reduce energy consumption, reduce production costs, save fossil fuels, reduce emissions and other sustainable development principles.

[0006] In the prior art, there are many improvements similar to the above-mentioned torch support and appearance. For example, "A torch feeding structure for special glass hot processing" CN217604090U; "Flame spray gun" CN202320860977.5; "A tin bath outlet edge torch for float glass production" CN204981592U, etc., the search found that there are relatively many patents for improvement and innovation of the torch support, gun head, nozzle, mixed gas, automatic advance and retreat of the gun body, automatic adjustment of the needle valve, etc. However, according to the situation found by the patent search of the inventor, there is a lack of innovative ideas such as recycling the waste heat in the high temperature zone of the annealing furnace, heating the glass edge, and supplementing the shortage with natural gas or oil guns. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an energy-saving side lance system for a flat glass annealing furnace.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: providing a side ignition gun system of a flat glass annealing furnace, comprising a side ignition gun body, the side ignition gun body is used to heat the edge of the flat glass, the side ignition gun body comprises an inner tube assembly and an outer tube assembly sleeved outside the inner tube assembly; The outer pipe assembly comprises an outer gas pipe, the gas inlet of the outer gas pipe is connected to the natural gas input pipe; the gas outlet of the outer gas pipe is provided with a first expansion cavity; The inner tube assembly includes an energy-saving inner tube pipeline, 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 through a heat-resistant steel seamless pipe, and the air outlet of the energy-saving inner tube pipeline is provided with a second expansion cavity sleeved inside the first expansion cavity.

[0009] The beneficial effect of the present invention is that in order to solve the problems of fast cooling of the edges, large temperature difference, easy plate explosion, edge falling, poor cutting, etc. in the production process of flat glass, the present invention creatively collects and recycles the waste heat and high temperature air discharged from the annealing furnace, and uses it to heat the edges of the glass plates with the edge torch, forming a new type of edge torch heating system with waste heat and high temperature air as the main heating energy source and natural gas or oil as a supplementary auxiliary energy source. The specific innovations are as follows: 1. The waste high temperature air (480-600℃) discharged from the high temperature zone of the annealing furnace is recycled and reused as the edge torch heating energy source, saving fossil energy and reducing carbon emissions. It not only realizes the recycling of waste heat, but also saves non-renewable fossil energy and protects the environment. 2. A set of double-layer internal and external mixed heating methods is creatively developed. A mixed heating mode with high temperature waste heat air as the main and natural gas as the auxiliary is adopted. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the relevant structure of a side ignition gun system of a flat glass annealing furnace according to a specific embodiment of the present invention; Figure 2 It is a schematic diagram of the relevant structure of a side ignition gun system of a flat glass annealing furnace according to a specific embodiment of the present invention; Description of labels: 1. Flat glass annealing furnace; 11. Flat glass; 2. Exhaust duct; 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; 4. The rimfire gun body; 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; 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; 5. Infrared temperature measuring instrument. DETAILED DESCRIPTION

[0011] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0012] The present invention provides a side ignition gun system for a flat glass annealing furnace, comprising a side ignition gun body, the side ignition gun body being used to heat the side of the flat glass, the side ignition gun body comprising an inner tube assembly and an outer tube assembly sleeved outside the inner tube assembly; The outer pipe assembly 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, which plays a role in stabilizing and boosting pressure; The inner tube assembly includes an energy-saving inner tube pipeline, 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 through a heat-resistant steel seamless pipe, and the air outlet of the energy-saving inner tube pipeline is provided with a second expansion cavity sleeved inside the first expansion cavity.

[0013] The beneficial effects of the present invention are: 1. The waste high-temperature air (480-600°C) in the high-temperature zone of the emptied flat glass annealing furnace is recycled and used as the heating energy for the side torch, saving fossil energy and reducing carbon emissions. It not only realizes the recycling of waste heat, but also saves non-renewable fossil energy and protects the environment. 2. A set of double-layer internal and external mixed heating methods is creatively developed. A mixed heating mode with high-temperature waste heat air as the main and natural gas as the auxiliary is adopted. Specifically: The glass plate exchanges energy with the medium of hot air circulation in Zone A of the annealing furnace, and the waste hot air generated is discharged to the outside through the annealing furnace fan with a temperature of about 480℃-600℃. The opening near the top of the factory building upstream of the exhaust duct in Zone A of the annealing furnace is 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 to be supplied to the side ignition gun.

[0014] 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 lateral temperature of the plate surface.

[0015] 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 whose radial cross-sectional areas gradually increase; 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 through hole on the gas partition and the combustion nozzle are arranged in a cross-shaped and non-corresponding manner.

[0016] Furthermore, in the above-mentioned side lance system of the flat glass annealing furnace, the second expansion cavity includes a first high-temperature air cavity, a first high-temperature air plenum, and a second high-temperature air plenum whose radial cross-sectional area gradually increases; the first high-temperature air cavity, the second and third high-temperature air plenums play the role of stabilizing pressure, boosting pressure, and increasing the impact of hot air flow heating. A first partition is provided between the first high-temperature air cavity and the first high-temperature air plenum, 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 high-temperature air through holes on the first partition and the high-temperature air through holes on the second partition are staggered and asymmetrically arranged. The asymmetric structure of the through holes is conducive to further promoting pressure stabilization, boosting pressure, and increasing the impact of hot air flow heating.

[0017] As can be seen from the above description, the present invention creatively develops a side-fire gun system that adopts sleeve energy transmission and supply, and sets 5 mixing chambers in the nozzle, so that the flame temperature and waste high-temperature air temperature are stable and the heating condition is good. Its advantages are that it reduces energy waste, promotes waste heat recovery and utilization, and makes a positive contribution to carbon emissions.

[0018] Furthermore, in the above-mentioned side flame gun 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.

[0019] Furthermore, in the side flame gun system of the flat glass annealing furnace, a natural gas pressure gauge, a flow meter and a needle-type solenoid valve are provided on the outer gas pipe.

[0020] From the above description, it can be seen that the natural gas pressure gauge, flow meter and needle solenoid valve are electrically connected to the control cabinet PLC to achieve accurate control of opening and closing and flow rate adjustment, etc. to meet the purpose of how high the glass edge temperature needs to be and how much heat energy is supplied.

[0021] 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 to supplement the edge ignition temperature, so as to ensure the consistency of the glass edge temperature and the lateral temperature of the plate surface.

[0022] 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.

[0023] From the above description, it can be seen that the high temperature gas pressure gauge, high temperature gas mass flow meter and high temperature electromagnetic needle valve are electrically connected with the control cabinet PLC to achieve accurate control of opening and closing and flow rate adjustment, etc. to meet the purpose of how high the temperature of the glass edge needs to be and how much heat energy is supplied.

[0024] Furthermore, in the side torch system of the flat glass annealing furnace, the hot air temperature of the exhaust duct in the high temperature zone of the flat glass annealing furnace is 480-600°C.

[0025] Furthermore, in the side ignition gun system of the above-mentioned flat glass annealing furnace, a centrifugal fan is provided on the heat-resistant steel seamless pipe, and the diameter of the heat-resistant steel seamless pipe is 50-100 mm and the wall thickness is 3-8 mm.

[0026] Furthermore, in the above-mentioned side ignition gun system of the flat glass annealing furnace, an insulation layer is provided on the outer surface of the heat-resistant steel seamless tube.

[0027] Furthermore, in the above-mentioned side lance system of the flat glass annealing furnace, the diameter of the energy-saving inner pipe is 30-60 mm, and the diameter of the gas outer pipe is 70-90 mm.

[0028] Example 1 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 a 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 heating method and natural gas as the auxiliary heating method to heat the edge of the flat glass.

[0029] See also Figure 1-2 The edge ignition gun system of the flat glass annealing furnace of this embodiment includes an edge ignition gun body 4, which is used to heat the edge of the flat glass. The edge ignition gun body 4 includes an inner tube assembly 42 and an outer tube assembly 41 sleeved outside the inner tube assembly 42; The outer pipe assembly 41 includes an outer gas pipe, the gas inlet of which is connected to the natural gas input pipe; the gas outlet of the outer gas pipe is provided with a first expansion cavity 411; 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.

[0030] 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℃) of zone A (high temperature zone) of the annealing furnace. One end of the pipe is welded to the exhaust pipe of zone A of the annealing furnace, 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 through variable frequency speed control.

[0031] The first expansion cavity 411 includes a first natural gas cavity 412 and a second natural gas cavity 413 whose radial cross-sectional areas gradually increase; 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.

[0032] 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, 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.

[0033] The waste high-temperature air is sent in through the heat-resistant steel seamless pipe 3, and is homogenized, boosted and stabilized by passing through the first high-temperature air cavity 422, the first high-temperature air stabilizing chamber 423 and the second high-temperature air stabilizing chamber 424. The partitions of each layer play the role of buffering, homogenization, stabilization and boosting to avoid heat and temperature fluctuations, and then it is shot to the edge of the glass plate to implement the heating function of the waste high-temperature air. The aperture of the partition is 2-5mm, and the holes of each layer of partitions are asymmetrical, which plays an auxiliary role in boosting, stabilizing, homogenizing, mixing and stabilizing the waste high-temperature air.

[0034] An infrared temperature measuring instrument 5 is provided at the edge of the flat glass 11. When the waste high temperature air cannot meet the heating requirements of the glass edge due to the influence of glass thickness and room temperature, the PLC of the control cabinet automatically starts natural gas combustion heating to compensate for the problem of insufficient heating due to waste heat. The natural gas is turned on, and after boosting, stabilizing, mixing and homogenizing in the first natural gas chamber 412 and the second natural gas chamber 413, it rushes out through the combustion nozzle to burn and heat the glass plate edge.

[0035] On the heat-resistant steel seamless pipe 3, near the interface of the exhaust pipe, a high-temperature gas pressure gauge, a high-temperature gas mass flow meter, a temperature sensor and an electromagnetic needle valve are installed respectively. The high-temperature gas pressure gauge 31, the high-temperature gas mass flow meter 32, the temperature sensor 33 and the electromagnetic needle valve 34 are all electrically connected to the control cabinet. The heat-resistant steel seamless pipe 3 is insulated with thermal insulation cotton to prevent heat loss caused by heat dissipation in the pipeline. The outer layer of the thermal insulation cotton is wrapped and fixed with tinplate.

[0036] The energy-saving inner pipe is made of a 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 is a natural gas passage. The gas outer pipe is composed of a heat-resistant seamless steel pipe with a diameter of 70-90mm and a wall thickness of 3-5mm. A natural gas pressure gauge 415, a flow meter 416 and a needle-type solenoid valve 417 are installed on the gas outer pipe. The control cabinet accurately controls the opening and closing of the solenoid valve 417 and the adjustment of the flow rate.

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A side torch system for a flat glass annealing furnace, characterized in that: The side ignition gun body is used to heat the edge of the flat glass, and the side ignition gun body includes an inner tube assembly and an outer tube assembly sleeved outside the inner tube assembly; The outer pipe assembly comprises an outer gas pipe, the gas inlet of the outer gas pipe is connected to the natural gas input pipe; the gas outlet of the outer gas pipe is provided with a first expansion cavity; The inner tube assembly includes an energy-saving inner tube pipeline, 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 through a heat-resistant steel seamless pipe, and the air outlet of the energy-saving inner tube pipeline is provided with a second expansion cavity sleeved inside the first expansion cavity.

2. The side torch system of the flat glass annealing furnace according to claim 1, characterized in that: The first expansion cavity comprises 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.

3. The side torch system of the flat glass annealing furnace according to claim 2, characterized in that: The second expansion cavity includes a first high-temperature air cavity, a first high-temperature air plenum chamber, and a second high-temperature air plenum chamber, whose radial cross-sectional area gradually increases; a first partition is provided between the first high-temperature air cavity and the first high-temperature air plenum chamber, a second partition is provided between the first high-temperature air plenum chamber and the second high-temperature air plenum 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.

4. The side torch system of the flat glass annealing furnace according to claim 3, 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.

5. The side torch system of the flat glass annealing furnace according to claim 1, characterized in that: The outer gas pipeline is provided with a natural gas pressure gauge, a flow meter and a solenoid valve.

6. The side torch system of the flat glass annealing furnace according to claim 1, characterized in that: The end of the heat-resistant steel seamless pipe close to the exhaust 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.

7. The side torch system of the flat glass annealing furnace according to claim 1, characterized in that: The hot air temperature of the exhaust duct in the high temperature zone of the flat glass annealing furnace is 480-600°C.

8. The side torch system of the flat glass annealing furnace according to claim 1, characterized in that: The heat-resistant steel seamless pipeline is provided with a centrifugal fan. The heat-resistant steel seamless pipe has a diameter of 50-100 mm and a wall thickness of 3-8 mm.

9. The side torch system of the flat glass annealing furnace according to claim 1, characterized in that: The outer surface of the heat-resistant steel seamless pipe is provided with a heat-insulating layer.

10. The side torch system of the flat glass annealing furnace according to claim 1, characterized in that: The diameter of the energy-saving inner pipe is 30-60 mm, and the diameter of the gas outer pipe is 70-90 mm.

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