CN117401900A - Heating device, equipment and wire drawing process for glass fiber wire drawing - Google Patents
Heating device, equipment and wire drawing process for glass fiber wire drawing Download PDFInfo
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- CN117401900A CN117401900A CN202311344164.1A CN202311344164A CN117401900A CN 117401900 A CN117401900 A CN 117401900A CN 202311344164 A CN202311344164 A CN 202311344164A CN 117401900 A CN117401900 A CN 117401900A
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- tube
- heating device
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- 239000003365 glass fiber Substances 0.000 title claims abstract description 61
- 238000010438 heat treatment Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 25
- 238000005491 wire drawing Methods 0.000 title claims description 22
- 239000007789 gas Substances 0.000 claims abstract description 115
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000001301 oxygen Substances 0.000 claims abstract description 47
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 47
- 238000012681 fiber drawing Methods 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 22
- 230000004888 barrier function Effects 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 32
- 239000011521 glass Substances 0.000 claims description 19
- 239000002737 fuel gas Substances 0.000 claims description 16
- 239000003345 natural gas Substances 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 2
- 229910001882 dioxygen Inorganic materials 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 51
- 239000000835 fiber Substances 0.000 description 39
- 239000010453 quartz Substances 0.000 description 36
- 238000002485 combustion reaction Methods 0.000 description 16
- 239000003795 chemical substances by application Substances 0.000 description 10
- 238000004513 sizing Methods 0.000 description 10
- 238000002156 mixing Methods 0.000 description 9
- 238000009826 distribution Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003949 liquefied natural gas Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/60—Optical fibre draw furnaces
- C03B2205/62—Heating means for drawing
Abstract
The invention provides a heating device, equipment and a drawing process for glass fiber drawing, and relates to the technical field of glass fiber processing, wherein the heating device for glass fiber drawing comprises a premixer, a mixer and a burner which are connected in sequence; the premixer comprises a premixing tube, an oxygen tube and a gas tube; the premixing pipe is coaxially sleeved outside the gas pipe, and the pipe wall at one end of the premixing pipe is in sealing connection with the outer wall of the gas pipe; the oxygen pipe is arranged on the side wall of the premixing pipe and is communicated with the premixing pipe; the inner diameter of the gas pipe near the gas outlet along the gas flow direction is reduced; the mixer is internally provided with a porous barrier material. The heating device for glass fiber drawing provided by the invention can obtain stable high-temperature flame under the conditions of low pressure and low-speed combustible gas, and can meet the preparation requirements of high-melting-point glass fibers.
Description
Technical Field
The invention belongs to the technical field of glass fiber processing, and particularly relates to a heating device and equipment for glass fiber drawing and a drawing process.
Background
The current common preparation process for high-melting glass fiber products adopts a flame method for wiredrawing production. The flame temperature can reach more than 2000 ℃ by controlling high-pressure high-flow gas and combustion-supporting oxygen, and the drawing temperature of the high-melting glass fiber is achieved by adjusting technological parameters such as flow, pressure and the like, so that the drawing preparation process is realized. Chinese patent CN200710053145.8 proposes a preparation method of quartz cotton, and the technology proposes to set the gas pressure above 0.2MPa and the oxygen pressure of 0.25MPa to make the flame temperature in the range of 1800-2000 ℃ so as to realize the wiredrawing preparation of quartz cotton. The chinese patent No. cn202220453855.X proposes a device for improving the mixing state of fuel gas, which is designed to use oxygen as a main pipeline and flammable gas as a side pipeline for mixing, and this mixing method can improve the flame combustion condition to a certain extent, but cannot significantly improve the flame combustion temperature, and is mainly designed based on high-pressure fuel gas, and for enterprises using low-pressure urban natural fuel gas (the outlet pressure is not greater than 0.1 MPa), the use requirement of fiber drawing cannot be met by using the above device.
However, for some areas, based on the safe production and use requirements, the high-pressure liquefied combustible gas cannot be used for production, but only low-pressure urban pipeline natural gas can be used for substitution, the outlet pressure of the urban natural gas pipeline (main pipeline) natural gas is not more than 0.1MPa, and the flame temperature of the traditional device is difficult to reach the drawing preparation requirement of high-melting-point glass fibers.
Accordingly, it is desirable to provide an apparatus that can achieve the drawing preparation requirements of high melting point glass fibers using low pressure gas.
Disclosure of Invention
Aiming at the problem that the heating device in the prior art cannot obtain stable high-temperature flame by using low-pressure urban pipeline natural gas and cannot meet the drawing preparation requirement of high-melting-point glass fibers, the invention provides the heating device, the equipment and the drawing process for glass fiber drawing.
In a first aspect, the invention provides a heating device for glass fiber drawing, which comprises a premixer 1, a mixer 2 and a burner 3 which are sequentially connected;
the premixer 1 comprises a premixing tube 11, an oxygen tube 12 and a gas tube 13;
the premixing tube 11 is coaxially sleeved outside the gas tube 13, and the tube wall at one end of the premixing tube 11 is in sealing connection with the outer wall of the gas tube 13;
the oxygen pipe 12 is arranged on the side wall of the premixing pipe 11 and is communicated with the premixing pipe 11;
the inner diameter of the gas pipe 13 near the gas outlet in the gas flow direction is reduced;
the mixer 2 is internally provided with a porous barrier material 21.
In one possible design, the gas pipe 13 has an inlet diameter of 10 to 40mm and an outlet diameter of 0.5 to 4mm.
In one possible design, the thickness of the barrier material is 0.1 to 10mm; and/or
The porous barrier material 21 has a sponge porous structure.
In one possible design, the burner 3 is provided with two rows of flame nozzles 31; the diameter of the flame nozzle 31 is 0.8 to 1.5mm.
In a second aspect, the present invention provides a glass fiber drawing apparatus comprising the heating device of the first aspect and a lower rod mechanism 6 connected to the heating device.
In one possible design, the lower rod mechanism 6 is provided with a guide tube 61 and a positioning assembly 62;
the guide tube 61 is used to position the glass rod at the flame nozzle 31 of the burner 3;
the positioning assembly 62 is used to center the glass rod with the flame nozzle 31.
In a third aspect, the present invention provides a glass fiber drawing process, implemented by the glass fiber drawing apparatus of the second aspect, the process comprising the steps of:
the starting device is used for respectively introducing oxygen and natural gas into the oxygen pipe 12 and the gas pipe 13;
placing the glass rod at a flame nozzle 31 of the burner 3, and softening to obtain a filament root;
and drawing the silk root to obtain the glass fiber.
In one possible design, the pressure of the oxygen gas introduced into the oxygen tube 12 is 0.06-0.1 MPa;
the pressure of the fuel gas introduced into the fuel gas pipe 13 is 0.06 to 0.1MPa.
In one possible design, the linear velocity of the mixture of oxygen and natural gas at the flame nozzle 31 is 10 to 100mm/s.
In one possible design, the coefficient of variation of the glass fiber diameter is no greater than 5%; and/or
When the diameter of the glass fiber is more than or equal to 6.5 mu m, the full cylinder rate is more than or equal to 85 percent;
when the diameter of the glass fiber is less than 6.5 mu m, the full cylinder rate is more than or equal to 65 percent.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the heating device for glass fiber drawing, the inner diameter of the gas pipe, which is close to the gas outlet along the gas flow direction, is reduced, so that the flow speed of gas is suddenly increased, injection is formed at the gas pipe outlet, and meanwhile, negative pressure absorption is formed at the gas pipe outlet due to high-speed injection of gas, and the gas injected by the gas pipe is mixed with oxygen to form a gas cluster containing gas and oxygen; after the air mass enters the mixer, the speed of the air mass can be reduced through the porous barrier material, the air mass is decomposed into micro air mass, the mixing efficiency of fuel gas and oxygen is further improved, the micro air mass enters the combustion cavity of the burner and is filled and extruded to form a stable air pocket, the formation of the air pocket enables the flow velocity of the mixed gas at the flame nozzles to be more uniform, the combustion efficiency of the mixed gas is obviously improved, and high-temperature flames with uniform and stable temperature are formed at the flame nozzles.
The heating device for glass fiber drawing provided by the invention ensures that the gas and the oxygen are mixed more uniformly through the pressure equalizing mixing effect of the premixer, the mixer and the burner, can effectively improve the combustion speed (the combustion amount of the combustible gas in unit time) of the gas, and improves the flame temperature at the flame nozzle, thereby realizing stable high-temperature flame under the conditions of low pressure (0.01-0.1 MPa) and low speed (10-100 m/s) of the combustible gas and meeting the preparation requirement of high-melting-point glass fiber.
The heating device for glass fiber drawing provided by the invention adopts low-pressure and low-speed combustible gas as fuel, so that high-temperature flame meeting the preparation requirement of high-melting glass fiber can be obtained, and the gas blowing resistance at the glass rod filament root can be reduced due to small flow of the combustible gas, so that the filament root is more stable, the drawing stability in the whole drawing process can be effectively improved, and the flying filament frequency can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a structure of a premixer in a heating device for glass fiber drawing;
fig. 2 is a schematic structural view of a mixer in the heating device for glass fiber drawing provided by the invention;
FIG. 3 is a schematic view of the burner and down rod mechanism of the glass fiber drawing apparatus provided by the invention;
FIG. 4 is a graph showing the diameter distribution of glass fibers produced from the entire filaments of the whole bundle of filaments according to example 1 of the present invention;
FIG. 5 is a graph showing the diameter distribution of glass fibers obtained from the entire filaments of the whole bundle of filaments according to comparative example 2 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments described below will be clearly and completely described in conjunction with the technical solutions of the embodiments of the present invention, and it is apparent that the described embodiments are some, but not all, embodiments of the present invention, and all other embodiments obtained by persons of ordinary skill in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
In a first aspect, the invention provides a heating device for glass fiber drawing, which comprises a premixer 1, a mixer 2 and a burner 3 which are sequentially connected;
the premixer 1 comprises a premixing tube 11, an oxygen tube 12 and a gas tube 13;
the premixing tube 11 is coaxially sleeved outside the gas tube 13, and the tube wall at one end of the premixing tube 11 is in sealing connection with the outer wall of the gas tube 13;
the oxygen pipe 12 is arranged on the side wall of the premixing pipe 11 and is communicated with the premixing pipe 11;
the inner diameter of the gas pipe 13 near the gas outlet in the gas flow direction is reduced;
the mixer 2 is internally provided with a porous barrier material 21.
According to the heating device for glass fiber drawing, the inner diameter of the gas pipe, which is close to the gas outlet along the gas flow direction, is reduced, so that the flow speed of gas is suddenly increased, injection is formed at the gas pipe outlet, and meanwhile, negative pressure absorption is formed at the gas pipe outlet due to high-speed injection of gas, and the gas injected by the gas pipe is mixed with oxygen to form a gas cluster containing gas and oxygen; after the air mass enters the mixer, the speed of the air mass can be reduced through the porous barrier material, the air mass is decomposed into micro air mass, the mixing efficiency of fuel gas and oxygen is further improved, the micro air mass enters the combustion cavity of the burner and is filled and extruded to form a stable air pocket, the formation of the air pocket enables the flow velocity of the mixed gas at the flame nozzles to be more uniform, the combustion efficiency of the mixed gas is obviously improved, and high-temperature flames with uniform and stable temperature are formed at the flame nozzles.
The heating device for glass fiber drawing provided by the invention ensures that the gas and the oxygen are mixed more uniformly through the pressure equalizing mixing effect of the premixer, the mixer and the burner, can effectively improve the combustion speed (the combustion amount of the combustible gas in unit time) of the gas, and improves the flame temperature at the flame nozzle, thereby realizing stable high-temperature flame under the conditions of low pressure (0.01-0.1 MPa) and low speed (10-100 m/s) of the combustible gas and meeting the preparation requirement of high-melting-point glass fiber.
The heating device for glass fiber drawing provided by the invention adopts low-pressure and low-speed combustible gas as fuel, so that high-temperature flame meeting the preparation requirement of high-melting glass fiber can be obtained, and the gas blowing resistance at the glass rod filament root can be reduced due to small flow of the combustible gas, so that the filament root is more stable, the drawing stability in the whole drawing process can be effectively improved, and the flying filament frequency can be reduced.
In some preferred embodiments, the premixer 1 and the mixer 2 of the present invention are connected by a first connecting pipe 4, and the mixer 2 and the burner 3 are connected by a second connecting pipe 5; the gas is sprayed from the gas pipe 13 at a high speed and then mixed with oxygen in the first connecting pipe 4 to form a gas mass containing the gas and the oxygen, the gas mass is decomposed into micro gas mass through the porous barrier material 21 after entering the mixer 2, the micro gas mass enters the combustion cavity of the combustor 3 through the second connecting pipe 5 and then is filled and extruded to form a stable gas bag, the formation of the gas bag enables the flow rate of the mixed gas at the flame nozzles 31 to be more uniform, the combustion efficiency of the mixed gas is obviously improved, and high-temperature flame with uniform and stable temperature is formed at each flame nozzle 31.
The porous barrier material 21 of the present invention is fixed inside the mixer 2 by a fixing member provided inside the mixer 2.
In some preferred embodiments, the gas pipe 13 has an inlet with an inner diameter of 10 to 40mm and an outlet with an inner diameter of 0.5 to 4mm. The inner diameter of the gas inlet of the gas pipe 13 can be any value of 10-40 mm, and the inner diameter of the gas outlet can be any value of 0.5-4 mm.
In some preferred embodiments, the thickness of the barrier material is 0.1 to 10mm (e.g., may be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10 mm); and/or
The porous barrier material 21 has a sponge porous structure; preferably, the porous barrier material has a grammage of 100 to 1300g/m -2 The strength is (T: 1200-4000N/50 mm, W: 1000-3000N/50 mm), the thickness is 1-10 mm, the air permeability is 1-80 cm/s; wherein T represents the strength of the warp direction and W represents the strength of the weft direction.
The material of the porous barrier material is not particularly limited, and the porous barrier material can be provided with a porous structure, for example, a filter cotton felt, a sponge and the like; the porous barrier material is preferably a sponge porous structure, and the porous barrier material is preferably a sponge. According to the invention, the blocking material with the sponge porous structure is selected, so that the air mass can be decomposed better, and the mixing efficiency of fuel gas and oxygen is improved.
In some preferred embodiments, the burner 3 is provided with two rows of flame nozzles 31; the diameter of the flame nozzle 31 is 0.8-1.5 mm; the diameter of the flame nozzle of the invention can be any value of 0.8-1.5 mm; preferably, 10 to 200 flame nozzles 31 are provided in each row.
In a second aspect, the present invention provides a glass fiber drawing apparatus comprising the heating device of the first aspect and a lower rod mechanism 6 connected to the heating device.
In some preferred embodiments, a guide tube 61 and a positioning assembly 62 are provided in the lower rod mechanism 6;
the guide tube 61 is used to position the glass rod at the flame nozzle 31 of the burner 3;
the positioning assembly 62 is used to center the glass rod with the flame nozzle 31.
The glass rod is positioned to the corresponding flame nozzle, and then the glass rod in the rod-descending mechanism is aligned with the center of the flame nozzle through the positioning component, so that the glass rod is heated at the flame center, and the gas burning rate and the flame heating temperature are highest.
In a third aspect, the present invention provides a glass fiber drawing process, implemented by the glass fiber drawing apparatus of the second aspect, the process comprising the steps of:
the starting device is used for respectively introducing oxygen and natural gas into the oxygen pipe and the gas pipe;
placing the glass rod at a flame nozzle of a burner, and softening to obtain a wire root;
and drawing the silk root to obtain the glass fiber.
The glass fiber drawing equipment comprising the heating device for glass fiber drawing uses low-pressure and low-speed combustible gas as fuel, so that high-temperature flame meeting the preparation requirement of high-melting glass fiber can be obtained, and the gas blowing resistance at the glass rod filament root can be reduced due to small flow of the combustible gas, so that the filament root is more stable, the drawing stability in the whole drawing process can be effectively improved, and the flying filament frequency can be reduced.
In addition, through the pressure equalizing mixing action of the premixer, the mixer and the burner, the combustion rate of the fuel gas is obviously improved, and the heat exchange rate of the contact surface of the flame and the glass rod is increased, so that the gas consumption can be obviously reduced, compared with the existing heating device (the device without the premixer and the device of the patent CN202220453855. X) reaches the same flame temperature, and the total flow of the fuel gas is from 10m to 12m 3 Reducing the rate of the catalyst per hour to 4-7 m 3 /h。
In some preferred embodiments, the pressure of the oxygen fed into the oxygen tube 12 is 0.06 to 0.1MPa;
the pressure of the fuel gas introduced into the fuel gas pipe 13 is 0.06 to 0.1MPa.
The pressure of the fuel gas is the pressure of the urban natural gas pipeline, and the pressure of the oxygen is controlled in the range so as to ensure that the fuel gas and the oxygen are mixed more fully.
In some preferred embodiments, the linear velocity of the mixture of oxygen and natural gas at the flame nozzle 31 is 10 to 100mm/s.
In some preferred embodiments, the coefficient of variation of the glass fiber diameter is no greater than 5%; and/or
When the diameter of the glass fiber is more than or equal to 6.5 mu m, the full cylinder rate is more than or equal to 85 percent;
when the diameter of the glass fiber is less than 6.5 mu m, the full cylinder rate is more than or equal to 65 percent.
In order to more clearly illustrate the technical scheme and advantages of the present invention, the present invention will be further described below with reference to examples. The materials and the reagents in the invention can be obtained by direct purchase or self-synthesis in the market, and the specific model is not limited.
The pull-down ratio (D/D) referred to in the examples refers to the diameter ratio of the quartz rod (D) to the quartz fiber (D); the full cone ratio represents the stability of the fiber drawing, and a higher full cone ratio indicates a more stable fiber drawing process.
Example 1
Starting a heating device for glass fiber drawing, opening a gas switch, controlling the pressure of natural gas entering a gas pipe to be 0.06MPa, setting the pressure of oxygen entering an oxygen pipe to be 0.06MPa, setting the diameter of a flame nozzle of a burner to be 0.9mm, and controlling the linear speed of mixed gas at the flame nozzle to be about 60m/s;
feeding a quartz glass rod with the diameter of 1.3mm into a nozzle at a constant speed through a rod feeding mechanism, heating and softening the quartz glass rod, and forming a wire root after heating and softening the quartz glass rod;
the quartz fiber sizing agent is coated by pulling the wire roots through an oiling device, then the quartz fiber sizing agent is bundled through a bundling wheel, and finally the quartz fiber with the designated diameter of 7.5 mu m (the pull-down ratio is 222) is obtained by pulling the wire roots through a wire drawing machine with a set rotating speed. The results show that the whole process is stable in wire drawing, the full tube rate is more than 90%, the average diameter of quartz fibers is 7.67 mu m, the diameter distribution of the quartz fibers prepared from all the roots of the whole bundle of wires (as shown in figure 4), and the results show that the uniformity of the diameters is higher, the uniformity in the linear density of the fibers is not more than 2%.
Example 2
Starting a heating device for glass fiber drawing, opening a gas switch, controlling the pressure of natural gas entering a gas pipe to be 0.1MPa, setting the pressure of oxygen entering an oxygen pipe to be 0.1MPa, setting the diameter of a flame nozzle of a burner to be 1.4mm, and controlling the linear speed of mixed gas at the flame nozzle to be about 40m/s;
feeding quartz glass rods with the diameter of 2.5mm into a nozzle at a constant speed through a rod feeding mechanism, heating and softening the quartz glass rods, and forming wire roots after the quartz glass rods are heated and softened;
the quartz fiber sizing agent is coated by pulling the wire roots through an oiling device, then the quartz fiber sizing agent is bundled through a bundling wheel, and finally the quartz fiber with the designated diameter of 9.0 mu m (the pull-down ratio is 278) is obtained by pulling the wire roots through a wire drawing machine with a set rotating speed. The result shows that the whole process is stable in wire drawing, the full tube rate is more than 92%, the average diameter of the quartz fiber is 9.05 mu m, and the variation coefficient of the diameter of the quartz fiber is 3.5%.
Example 3
Starting a heating device for glass fiber drawing, opening a gas switch, controlling the pressure of natural gas entering a gas pipe to be 0.02MPa, setting the pressure of oxygen entering an oxygen pipe to be 0.02MPa, setting the diameter of a flame nozzle of a burner to be 0.8mm, and controlling the linear speed of mixed gas at the flame nozzle to be about 30m/s;
feeding a quartz glass rod with the diameter of 1.0mm into a nozzle at a constant speed through a rod feeding mechanism, heating and softening the quartz glass rod, and forming a wire root after heating and softening the quartz glass rod;
the quartz fiber sizing agent is coated by pulling the wire roots through an oiling device, then the quartz fiber sizing agent is bundled through a bundling wheel, and finally the quartz fiber with the designated diameter of 6.0 mu m (the pull-down ratio is 167) is obtained by pulling the wire roots through a wire drawing machine with a set rotating speed. The result shows that the whole process is stable in wire drawing, the full tube rate is more than 72%, the average diameter of the quartz fiber is 6.13 mu m, and the variation coefficient of the diameter of the quartz fiber is 4.8%.
Comparative example 1
Starting a heating device, wherein the heating device selects a burner in the patent CN202220453855.X, a gas switch is turned on, the natural gas pressure entering a fuel pipe is controlled to be 0.1MPa, the oxygen pressure entering an oxygen pipe is set to be 0.1MPa, and the diameter of a flame nozzle of the burner is 0.8mm;
feeding a quartz glass rod with the diameter of 1.0mm into a nozzle at a constant speed through a rod feeding mechanism, heating and softening the quartz glass rod, and forming a wire root after heating and softening the quartz glass rod;
the quartz fiber sizing agent is coated by pulling the wire roots through an oiling device, then the quartz fiber sizing agent is bundled through a bundling wheel, and finally the quartz fiber with the designated diameter of 6.0 mu m (the pull-down ratio is 167) is obtained by pulling the wire roots through a wire drawing machine with a set rotating speed. The results show that the average diameter of the quartz fiber is 6.06 mu m, the variation coefficient of the diameter of the quartz fiber is 5.5%, the wire drawing stability in the whole process is poor, the condition of broken ends and flying wires frequently occurs in the wire drawing process, and the full barrel rate is below 50%. The burner is suitable for liquefied natural gas with high pipeline pressure, and the pressure of the burner is low, so that the wire drawing is difficult and the wire drawing stability is poor.
Comparative example 2
A starting device, wherein the heating device selects a burner in the patent CN202220453855.X, a gas switch is turned on, the natural gas pressure entering a fuel pipe is controlled to be 0.1MPa, the oxygen pressure entering an oxygen pipe is set to be 0.1MPa, and the diameter of a flame nozzle of the burner is 1.0mm; the gas flow rate at the gas nozzle is 200m/s;
feeding quartz glass rods with the diameter of 2.0mm into a nozzle at a constant speed through a rod feeding mechanism, heating and softening the quartz glass rods, and forming wire roots after the quartz glass rods are heated and softened;
the quartz fiber sizing agent is coated by pulling the wire roots through an oiling device, then the quartz fiber sizing agent is bundled through a bundling wheel, and finally the quartz fiber with the designated diameter of 9.0 mu m (the pull-down ratio of 222) is obtained by pulling the wire roots through a wire drawing machine with a set rotating speed. The results show that the average diameter of the quartz fiber is 8.8 mu m, the variation coefficient of the diameter of the quartz fiber is 7.8%, the wire drawing stability in the whole process is poor, flame combustion is uneven, the wire drawing of the fiber frequently occurs with wire flying and broken ends, the tempering condition occurs in the ignition process, and the full tube drawing rate is low. The burner is adopted as a heating device, the premixing effect is poor, and the gas combustion is insufficient, so that under the same hardware condition, the condition of softening the glass rod can be achieved by using a large flow of gas; however, the use of large-flow gas can cause different flow rates of each flame port, the gas combustion is uneven, the glass rod is softened fast and slow, the wire drawing is easy to break, and meanwhile, the fiber yarn is easy to blow off to cause broken ends and flying yarns.
And when the gas flow rate is reduced to 90m/s and the pull-down proportion is reduced, drawing to prepare quartz fiber with the designated diameter of 10.2 mu m, wherein the average diameter of the quartz fiber is 10.4 mu m, the variation coefficient of the diameter of the quartz fiber is 5.7, and the full tube drawing rate is more than 80%. The device can control the uniformity of the temperature of the porous flame by adopting a high-pressure air source, so as to draw the fiber with uniform diameter; therefore, after the low-pressure air source is adopted, flame temperature uniformity cannot be realized, so that glass rods are not uniformly melted, and quartz fiber diameters are not uniform. The diameter distribution discreteness of the quartz fiber prepared by the whole filament is larger (as shown in figure 5), and under the condition of reducing the flow rate and the pull-down proportion, the pulled quartz fiber is thicker, and the diameter distribution discreteness of the quartz fiber is large; it can be seen that the use of the apparatus for drawing wire is based on reduced product performance requirements.
In conclusion, the fiber drawing process prepared by the heating device has higher stability, and the obtained fiber has more uniform diameter distribution, higher full tube rate and smaller variation coefficient of the fiber diameter.
In the description of embodiments of the present invention, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance unless explicitly specified or limited otherwise; the term "plurality of sets" refers to two or more sets unless specified or indicated otherwise; the terms "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, it should be understood that the terms "upper", "lower", and the like used in the embodiments of the present invention are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and are not limiting; while the invention has been described in detail with reference to the foregoing embodiments, it will be appreciated by those skilled in the art that variations may be made in the techniques described in the foregoing embodiments, or equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A heating device for glass fiber drawing, which is characterized by comprising a premixer (1), a mixer (2) and a burner (3) which are connected in sequence;
the premixer (1) comprises a premixing tube (11), an oxygen tube (12) and a gas tube (13);
the premixing tube (11) is coaxially sleeved outside the gas tube (13), and the tube wall at one end of the premixing tube (11) is in sealing connection with the outer wall of the gas tube (13);
the oxygen pipe (12) is arranged on the side wall of the premixing pipe (11) and is communicated with the premixing pipe (11);
the inner diameter of the gas pipe (13) near the gas outlet along the gas flow direction is reduced;
the mixer (2) is internally provided with a porous barrier material (21).
2. A heating device according to claim 1, characterized in that the gas inlet of the gas pipe (13) has an inner diameter of 10-40 mm and the gas outlet has an inner diameter of 0.5-4 mm.
3. A heating device according to claim 1, wherein the thickness of the barrier material is 0.1-10 mm; and/or
The porous barrier material (21) has a sponge porous structure.
4. A heating device according to claim 1, characterized in that the burner (3) is provided with two rows of flame nozzles (31);
the diameter of the flame nozzle (31) is 0.5-1.5 mm.
5. Glass fiber drawing apparatus, characterized in that it comprises a heating device according to any one of claims 1 to 4 and a rod-lowering mechanism (6) connected to the heating device.
6. Glass fiber drawing plant according to claim 5, characterized in that the lower rod mechanism (6) is provided with a guide tube (61) and a positioning assembly (62);
the guide tube (61) is used for positioning a glass rod to a flame nozzle (31) of the burner (3);
the positioning assembly (62) is used for aligning the glass rod with the center of the flame nozzle (31).
7. A glass fiber drawing process realized by the glass fiber drawing apparatus according to any one of claims 5 to 6, comprising the steps of:
the starting device is used for respectively introducing oxygen and natural gas into the oxygen pipe (12) and the gas pipe (13);
placing a glass rod at a flame nozzle (31) of a burner (3), and softening to obtain a wire root;
and drawing the silk root to obtain the glass fiber.
8. The wire drawing process according to claim 7, wherein the pressure of the oxygen gas introduced into the oxygen pipe (12) is 0.06 to 0.1MPa;
the pressure of the fuel gas introduced into the fuel gas pipe (13) is 0.06-0.1 MPa.
9. The drawing process according to claim 7, wherein the linear velocity of the mixture of oxygen and natural gas at the flame nozzle (31) is 10 to 100mm/s.
10. The drawing process of claim 7, wherein the coefficient of variation of the glass fiber diameter is no greater than 5%; and/or
When the diameter of the glass fiber is more than or equal to 6.5 mu m, the full cylinder rate is more than or equal to 85 percent;
when the diameter of the glass fiber is less than 6.5 mu m, the full cylinder rate is more than or equal to 65 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311344164.1A CN117401900A (en) | 2023-10-17 | 2023-10-17 | Heating device, equipment and wire drawing process for glass fiber wire drawing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311344164.1A CN117401900A (en) | 2023-10-17 | 2023-10-17 | Heating device, equipment and wire drawing process for glass fiber wire drawing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117401900A true CN117401900A (en) | 2024-01-16 |
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ID=89490154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311344164.1A Pending CN117401900A (en) | 2023-10-17 | 2023-10-17 | Heating device, equipment and wire drawing process for glass fiber wire drawing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117401900A (en) |
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2023
- 2023-10-17 CN CN202311344164.1A patent/CN117401900A/en active Pending
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