CN114538752B - Total oxygen combustion electric heating system for large-scale float plate glass production - Google Patents
Total oxygen combustion electric heating system for large-scale float plate glass production Download PDFInfo
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- CN114538752B CN114538752B CN202210032307.4A CN202210032307A CN114538752B CN 114538752 B CN114538752 B CN 114538752B CN 202210032307 A CN202210032307 A CN 202210032307A CN 114538752 B CN114538752 B CN 114538752B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/235—Heating the glass
- C03B5/2353—Heating the glass by combustion with pure oxygen or oxygen-enriched air, e.g. using oxy-fuel burners or oxygen lances
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/16—Construction of the float tank; Use of material for the float tank; Coating or protection of the tank wall
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/18—Controlling or regulating the temperature of the float bath; Composition or purification of the float bath
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
- C03B5/027—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/235—Heating the glass
- C03B5/2356—Submerged heating, e.g. by using heat pipes, hot gas or submerged combustion burners
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/24—Automatically regulating the melting process
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
Abstract
The invention discloses a total oxygen combustion electric heating system for large-scale float plate glass production, which belongs to the technical field of float plate glass production and comprises a plate float glass furnace, a plurality of electric heating control areas and a plurality of groups of mixed type adjustable-stage flame total oxygen burners, wherein a group of mixed type adjustable-stage flame total oxygen burners are arranged in the upper space of each electric heating control area, and each group of mixed type adjustable-stage flame burners is formed by a plurality of kiln upper top-blowing firearms and kiln side wall firearms; the electric heating control areas are connected in a triangular electrode layout, and the lengths of flames are adjusted by the aid of extension and retraction changes of inner tubes with small diameters in the middle of each top-blowing flame gun at the upper part of the kiln and the flame guns on the side walls of the kiln. The glass is melted by adopting electric energy on a large scale, and the problems that the flat glass is sodium alkali glass, the resistivity is small, the melting efficiency of the glass is difficult to improve by adopting a conventional electric heating mode, and the electric work efficiency is low are solved.
Description
Technical Field
The invention belongs to the technical field of float plate glass production, and particularly relates to a total oxygen combustion electric heating system for large-scale float plate glass production.
Background
The glass production industry is a high energy consumption industry and is one of the main sources of pollution and gas discharge. With the increasing demand for glass, especially the rapid development of large-size, high-strength, fireproof, high-temperature-resistant, impact-resistant and ultra-thin electronic flat glass, the reduction of energy consumption and pollution has become an urgent task.
The production of flat glass by the float process is a productive technology that has been introduced into china from the west several decades ago. The main heat source for melting glass is the combustion of natural gas, heavy oil or coal. Because of the problems of low efficiency and the like of heavy oil or coal, the heavy oil and the coal are rapidly taken out of production. For decades, most Chinese manufacturers (whether national enterprises or private enterprises) use natural gas as fuel, air to support combustion, heat and melt glass at the upper part of a glass kiln, and float forming is adopted, so that no substantial change exists except local equipment change.
In recent years, the technology of total oxygen combustion introduced from the western is characterized in that the combustion-supporting oxygen of natural gas adopts oxygen with the oxygen content of 95%, the combustion efficiency is improved, the consumption of natural gas is reduced, and an oxygen plant is replaced by a hot air pump, so that the glass melting efficiency is improved, and simultaneously, the emission of hydrocarbon and harmful toxic gas produced by combustion into the air is reduced. However, oxy-fuel combustion still maintains a considerable total amount of carbon emissions and heat losses, and production costs remain a major problem. A flat float total oxygen furnace producing 1000 tons per day burns about 6000-8000 cubic meters of natural gas per hour, and huge natural gas supply is still a considerable energy problem.
The use of electric energy for melting glass has been a technology used for a long time, and the electric energy melting glass can solve the problems of carbon emission and heat loss compared with the total oxygen combustion, but the electric energy melting glass is widely applied to the production of flat float glass in the world and domestic, and the large-scale process for producing high-quality and low-cost glass by adopting the electric energy melting glass still has a great technical obstacle to overcome.
The difficulty in realizing the large-scale melting of glass by electric energy is as follows: firstly, the melting efficiency of glass is difficult to improve by adopting a conventional electric heating mode, the flat glass is sodium alkali glass, and the resistivity is small, so that the electric work efficiency is low. Some western glass engineering companies have attempted to solve this complex engineering problem by using simple electric assist melting technology, which uses electric power that is low in total melting energy, and which is meaningless for glass melting. Just as adding an electric bulb to a large swimming pool heats up, there is no effect on the overall temperature profile of the pool. When the flame length is regulated, the second and the traditional burners need to change the gas flow, so that the energy of gas combustion is changed to cause over-combustion or under-combustion furnace conditions, thereby causing unstable flame, large impact on the furnace wall and the furnace top, uneven temperature and energy distribution in the furnace,
disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a total oxygen combustion electric heating system for large-scale float plate glass production, and the first aim is to solve the problem that the melting efficiency of glass is difficult to improve by adopting a conventional electric heating mode; second objective conventional burners have a problem in that flame instability causes non-uniformity in temperature and energy distribution in the furnace when the flame length is adjusted.
The invention adopts the following technical proposal to solve the technical problems
A full oxygen combustion electric heating system for large-scale float plate glass production is characterized in that: the device comprises a flat float glass furnace, a plurality of electric heating control areas and a plurality of groups of mixed type adjustable-stage flame oxy-fuel burners, wherein the upper space of each electric heating control area is provided with a group of mixed type adjustable-stage flame oxy-fuel burners, the rear part of a heating area is a clarifying area, and a bubbling area or a non-bubbling area can be established between the heating area and the clarifying area according to different designs; each group of mixed type adjustable-stage flame burners are formed by a plurality of top-blowing firearms at the upper part of the kiln and kiln side wall firearms transversely distributed on the two side furnace walls; the electric heating control areas are connected in a triangular electrode layout, and each electric heating control area is an independently controlled heating area; the multi-group adjustable-stage flame oxy-fuel burner utilizes the extension and retraction changes of inner tubes with small diameters in the middle of a top-blowing flame gun at the upper part of each kiln and a flame gun at the side wall of the kiln to adjust the length of flame.
The electrode triangle layout connection is that: triangle connection is carried out on the adjacent 2 electrodes of the current column and the same electrode of the adjacent column, and the distance between every two electrodes is the same, so that an equilateral triangle power-up mode is formed; the glass resistance between each two electrodes is the same, and the three-phase alternating current is balanced, has no phase difference and no direct current component.
The electric heating control area 2 connected with the electrode triangle layout is respectively applied with 220-460V voltage and power to more than 4000-10000 KW, and a zirconia molybdenum electrode or other types of electrodes can be adopted.
The top-blowing fire gun at the upper part of the kiln and the fire gun at the side wall of the kiln comprise an automatic adjustable-stage top-blowing fire gun at the upper part of the kiln, an automatic adjustable-stage fire gun at the side wall of the kiln and a manual adjustable-stage flame oxy-fuel burner; the top-blowing flame gun at the upper part of the automatic adjustable-level kiln is arranged on a kiln steel frame, and flames start from the lower port of the small-diameter inner tube of the top-blowing flame gun at the upper part of the automatic adjustable-level kiln; the top-blowing fire gun at the upper part of the automatic adjustable kiln is provided with an inner pipe and an outer pipe, wherein the inner pipe is used for introducing natural gas, and the outer pipe is used for introducing oxygen; the inner tube is provided with an upper half inner tube and a lower half inner tube which are sleeved together, the sleeved upper half inner tube is driven to move up and down by a transmission system arranged on the outer tube structure of the fire gun, the transmission system is arranged on a traditional system supporting steel structure, and the relative distance between the upper half inner tube and the lower half inner tube is adjusted through the transmission system, so that the whole small-diameter inner tube is lengthened or shortened.
The transmission system arranged on the outer tube structure of the burner comprises a transmission rack arranged on the upper half of the inner tube, a gear in kneading transmission with the transmission rack and a servo motor for controlling and driving the gear to rotate.
The kiln steel frame is connected with the burner supporting structure through a bearing; the burner support structure is provided with a mechanical structure for adjusting the inclination angle of the fire gun, the fire gun comprises a top-blowing fire gun at the upper part of the adjustable-stage kiln, and the mechanical structure drives the burner support structure and the top-blowing fire gun at the upper part of the adjustable-stage kiln arranged on the burner support structure to rotate at an angle in the front-back direction.
Advantageous effects of the invention
1. The invention adopts the same row of adjacent 2 electrodes and the adjacent row of the same 1 electrode to carry out triangle connection, the 2-point connection of the electrodes is changed into the 3-point connection of the electrodes by the traditional method, the 2-point connection is changed into the 3-point connection of the electrodes, the total number of the electrodes in each group is increased from 1 part of resistance to 3 parts of resistance under the condition of not changing the total number of the electrodes in the adjacent two rows, the total resistance is increased by more than one time, and the total power is increased by more than one time along with the increase of heat conduction of the resistance, thereby realizing the large-scale glass melting by adopting electric energy, and solving the problems that the flat glass is sodium alkali glass, the resistivity is small, the melting efficiency of the glass is difficult to be improved by adopting the conventional electric heating mode, and the electric work efficiency is low.
2. The adjustable full-oxygen top-blown burner is used for adjusting the length of flame by utilizing the extension and retraction changes of the inner tube with the small diameter in the middle. After the telescopic inner tube is utilized, the energy consumption of the glass kiln is kept high, and the energy-saving effect is good. When the burner adjusts the flame length, the gas flow is not required to be changed, and the energy of gas combustion is changed, so that the over-combustion or under-combustion furnace condition is caused. The flame is relatively stable due to the adjustable action of the inner tube. The temperature and energy distribution in the furnace can be homogenized by adopting a plurality of burners, the flame is more moderate, and the impact on the furnace wall and the furnace top is greatly reduced. Again improving combustion efficiency and reducing energy consumption by more than 8%.
3. The adoption of total oxygen/electric heating brings remarkable economic benefit, the production line with the similar configuration is 6-8 ten thousand tons of production per year, the production line with the new technology is adopted, the production reaches 11 ten thousand tons of production per year, the production is improved later, the production reaches 14 ten thousand tons of production per year, and the natural gas consumption is reduced by 1/3. The light melting energy is reduced from 1200-1400 kcal/kg of glass to 890-920 kcal/kg of glass. About 300 flat glass production lines are adopted in the whole country, the emission pollution is reduced by 70% by adopting a total oxygen/high electricity system, and the social benefit is quite considerable.
Drawings
FIG. 1-1 is a schematic view of an electrical heating system for a delta connection layout for float glass in accordance with the present invention;
FIGS. 1-2 are schematic illustrations of a spatially mixed adjustable stage flame oxy-fuel burner in the upper space of the electric heating control zone of FIG. 1;
FIG. 2-1 is a conventional 6-electrode-connected glass furnace electrical heating layout;
FIG. 2-2 is a schematic diagram of a triangular layout connecting electrode set according to the present invention;
FIG. 3-1 is a schematic view of an automatic adjustable stage flame oxy-fuel burner of the present invention;
FIG. 3-2 is a schematic view of an artificially adjustable stage flame oxy-fuel burner of the present invention;
FIG. 4 is a schematic view showing the effect of inserting electrodes into the bottom of the kiln;
in the figure: 1: a glass kiln; 1-1: kiln steel frame; 1-2: a bearing; an electric heating zone; 3: a top-blowing fire gun at the upper part of the automatic adjustable kiln; 4: automatic adjustable kiln side wall firearms; 2-1_2-12: an electrically heated electrode; 3-1: an inner tube; 3-2: an outer tube; 3-3: the traditional system supports a steel structure; 3-4: a transmission system; 3-4-1: a drive rack; 3-4-2: a gear; 3-4-3: a servo motor; 3-5: a mechanical structure for adjusting the inclination angle of the flame gun; 3-6: a burner support structure;
Detailed Description
Principle of the invention
1. Design principle of a mixed type adjustable-stage flame oxy-fuel burner: as shown in fig. 3-1, the length of the flame is adjusted by using the variation of the extension and retraction of the inner tube of the middle small diameter. The flame starts from the port of the middle small tube, and the length of the flame is adjusted by utilizing the change of the extension and retraction of the inner tube, so that the length of the flame can be adjusted without changing the flow of two gases (the natural gas inlet and the oxygen inlet). This does not affect the already set flow rate suitable for combustion. After the telescopic inner tube is utilized, the energy consumption of the glass kiln is kept high, and the energy-saving effect is good. When the burner adjusts the flame length, the gas flow is not required to be changed, so that the over-combustion or under-combustion furnace condition caused by the change of the energy of gas combustion due to the change of the gas flow is avoided. The flame is relatively stable due to the adjustable action of the inner tube. The temperature and energy distribution in the furnace can be homogenized by adopting a plurality of burners, the flame is more moderate, and the impact on the furnace wall and the furnace top is greatly reduced. Again improving combustion efficiency and reducing energy consumption by more than 8%.
2. The design principle of replacing two-point connection with electrode triangle connection is as follows: 1) Basic elements of electric heating design: two electrodes are arranged in the glass, voltage V is applied to the two electrodes, the resistance of the molten glass between the two electrodes is R, the current in the glass after being electrified is I, and then the electric power applied by electric heating is as follows: w=i 2 x R. This power heats the glass itself by heating the glass, which is the principle of electrical heating in the glass. 2) As seen from the electrically heated base element, there is a resistance between each two electrodes. The conventional method is as shown in FIG. 2-1: each row has a group of 2 adjacent electrodes, and each group is connected in a 2-point connection mode. There are 6 electrodes in each column and there is no connection between the electrodes in the columns, so that if there are 6 electrodes in each column, the two columns of electrodes are 10 resistors. 3) The invention performs triangle connection on two adjacent columns of electrodes, as shown in fig. 2-2, and specifically comprises the following steps: the adjacent 2 electrodes of the current column and the adjacent 1 electrode of the adjacent column are respectively connected to form electrode triangle connection, the electrode triangle connection is changed into a group from 2 electrodes to 3 electrodes, and when the 2 electrodes are in a group, each group is onlyWhen 1 part of resistor is provided and 3 electrodes are combined into one group, each group has 3 parts of resistor, although the number of the electrodes of each group is increased and is changed from 2 to 3, the total number of the electrodes is not changed, and compared with the figure 2-1 and the figure 2-2, the number of the electrodes of two adjacent columns is 12, and the invention increases 11 parts of resistor due to the triangular connection of the electrodes, and the invention is characterized in that the number of the electrodes is changed from W=I 2 x R it is seen that the power increases with increasing resistance.
3. The design principle of the vertical flow of the hot glass is enhanced. The single gas (or oil) glass melting furnace adopts the upper space combustion flame radiation and heat conduction heating mode, and the glass in the melting furnace has simple flow mode and very slow flow rate, even only flows like meters per hour. Most of heat energy of the glass melting furnace by the simple flame method is discharged into the atmosphere along with hot air flow, and the fuel utilization rate is still very low, so that the requirements of high efficiency and energy conservation are difficult to meet. The electrode is laid at the bottom of the kiln, and as shown in fig. 1 and 4, the upper part of the kiln adopts an automatic adjustable-stage kiln upper top-blowing fire gun 3. The electrodes 2-1_2-12 are inserted into the bottom of the kiln 1, so that the flow of the glass in the vertical direction is enhanced, and the meaning of the insertion depth is easy to understand. This effect was demonstrated in a variety of glass kilns: the electrode is powered on and the glass around the electrode is the region of highest temperature in the temperature field, as shown in fig. 4. The difference between the glass temperature at the remote electrode and the electrode surface temperature is about 150 c-200 c or more. Thus, within the primary zone of fusion at the upper portion of the electrode is a high energy, high temperature, hot glass mass, in which the chemical reaction is also most intense. In the gravitational field, a liquid with a small specific gravity cannot flow in the high-density and low-temperature directions without being pushed by external force. That is, the hot glass near the liquid level region does not flow from top to bottom without downward pushing force. However, since the temperature difference between the upper main melting zone temperature and the lower low temperature zone temperature can reach 200 ℃ or higher, internal mutual extrusion force is generated by the volume expansion of the upper glass. Such a pressure, as shown in the figure, when the resultant force of the downward force of the pressure and the glass surface tension and the resultant force of the weight of the glass itself are larger than the pressing force, a downward pushing force is generated, causing the convection-like glass to move up and down, so that the lower low-temperature glass is pressed upward. Considering glass fluid as a flow of several fluid control bodies, the transfer of thermal energy over time is clear with respect to motion.
4. The design principle of combining the triangle-connected electric heating system and the adjustable total oxygen top-blown burner. The triangular connection electric heating system increases power, enhances the vertical flow of hot glass and the homogenization of energy vertical distribution, the top-blowing flame gun 3 at the upper part of the automatic adjustable-level kiln and the flame gun 4 at the side wall of the automatic adjustable-level kiln homogenize the temperature and the energy distribution in the kiln, enhance the homogenization of the transverse and longitudinal distribution of energy, and the flame is more mild, greatly lightens the impact on a furnace wall and a furnace top, and mutually depends and supports the two to realize the homogenization of the energy distribution from the longitudinal and transverse directions respectively.
Based on the principle, the invention designs a full-oxygen combustion electric heating system for large-scale float plate glass production, which is shown in figures 1-1 and 1-2, and is characterized in that: the device comprises a flat float glass furnace 1, a plurality of electric heating control areas 2 and a plurality of groups of mixed type adjustable-stage flame oxy-fuel burners, wherein a group of mixed type adjustable-stage flame oxy-fuel burners are arranged in the upper space of each electric heating control area 2, a clarification area is arranged at the rear part of a heating area, and a bubbling area or a non-bubbling area can be arranged between the heating area and the clarification area according to different designs; each group of mixed type adjustable-stage flame burners are formed by a plurality of top-blowing firearms at the upper part of the kiln and kiln side wall firearms transversely distributed on the two side furnace walls; the electric heating control areas 2 are connected in a triangular electrode layout, and each electric heating control area is an independently controlled heating area; the multi-group adjustable-stage flame oxy-fuel burner utilizes the extension and retraction changes of inner tubes with small diameters in the middle of a top-blowing flame gun at the upper part of each kiln and a flame gun at the side wall of the kiln to adjust the length of flame.
The electrode triangle layout connection is that: triangle connection is carried out on the adjacent 2 electrodes of the current column and the same electrode of the adjacent column, and the distance between every two electrodes is the same, so that an equilateral triangle power-up mode is formed; the glass resistance between each two electrodes is the same, and the three-phase alternating current is balanced, has no phase difference and no direct current component.
The electric heating control area 2 connected with the electrode triangle layout is respectively applied with 220-460V voltage and power to more than 4000-10000 KW, and a zirconia molybdenum electrode or other types of electrodes can be adopted.
The top-blowing fire gun at the upper part of the kiln and the fire gun at the side wall of the kiln comprise an automatic adjustable-stage top-blowing fire gun 3 at the upper part of the kiln, an automatic adjustable-stage fire gun 4 at the side wall of the kiln and a manual adjustable-stage flame oxy-fuel burner; the top-blowing flame gun 3 at the upper part of the automatic adjustable-level kiln is arranged on a kiln steel frame, and flames start from the lower port of the small-diameter inner tube 3-1 of the top-blowing flame gun 3 at the upper part of the automatic adjustable-level kiln; the top-blowing gun 3 at the upper part of the automatic adjustable kiln is provided with an inner pipe 3-1 and an outer pipe 3-2, wherein the inner pipe is used for introducing natural gas, and the outer pipe is used for introducing oxygen; the inner tube 3-1 is provided with an upper half inner tube and a lower half inner tube which are sleeved together, the sleeved upper half inner tube is driven to move up and down by a transmission system 3-4 arranged on the outer tube structure of the fire gun, the transmission system 3-4 is arranged on a traditional system supporting steel structure 3-3, and the relative distance between the upper half inner tube and the lower half inner tube is regulated through the transmission system 3-4, so that the extension or shortening of the whole small-diameter inner tube is realized.
The transmission system 3-4 arranged on the outer tube structure of the burner comprises a transmission rack 3-4-1 arranged on the upper half of the inner tube, a gear 3-4-2 which is in kneading transmission with the transmission rack, and a servo motor 3-4-3 which controls and drives the gear to rotate.
The kiln steel frame 1-1 is connected with the burner supporting structure 3-6 through a bearing 1-2; the burner supporting structure 3-6 is provided with a mechanical structure 3-5 for adjusting the inclination angle of the top-blowing fire gun 3 at the upper part of the adjustable-stage kiln, and the mechanical structure 3-5 drives the burner supporting structure 3-6 and the top-blowing fire gun 3 at the upper part of the adjustable-stage kiln arranged on the burner supporting structure 3-6 to rotate at an angle in the front-back direction.
The kiln steel frame 1-1 is connected with the burner supporting structure 3-6 through a bearing 1-2; the burner support structure 3-6 is provided with a mechanical structure 3-5 for adjusting the inclination angle of the fire gun, the fire gun comprises an adjustable-stage kiln upper top-blowing fire gun 3, and the mechanical structure drives the burner support structure 3-6 and the adjustable-stage kiln upper top-blowing fire gun 3 arranged on the burner support structure 3-6 to rotate in a front-back direction.
It should be emphasized that the above-described embodiments are merely illustrative of the invention, which is not limited thereto, and that modifications may be made by those skilled in the art, as desired, without creative contribution to the above-described embodiments, while remaining within the scope of the patent laws.
Claims (5)
1. An oxy-fuel combustion electric heating system for large-scale float plate glass production, which is characterized in that: the device comprises a flat float glass furnace, a plurality of electric heating control areas and a plurality of groups of mixed type adjustable-stage flame oxy-fuel burners, wherein the upper space of each electric heating control area is provided with a group of mixed type adjustable-stage flame oxy-fuel burners, the rear part of a heating area is a clarifying area, and a bubbling area or a non-bubbling area can be established between the heating area and the clarifying area according to different designs; each group of mixed type adjustable-stage flame burners are formed by a plurality of top-blowing firearms at the upper part of the kiln and kiln side wall firearms transversely distributed on the two side furnace walls; the electric heating control areas are connected in a triangular electrode layout, and each electric heating control area is an independently controlled heating area; the multi-group adjustable-stage flame oxy-fuel burner utilizes the extension and retraction changes of inner tubes with small diameters in the middle of a top-blowing flame gun at the upper part of each kiln and a flame gun at the side wall of the kiln to adjust the length of flame;
the electrode triangle layout connection is that: triangle connection is carried out on the adjacent 2 electrodes of the current column and the same electrode of the adjacent column, and the distance between every two electrodes is the same, so that an equilateral triangle power-up mode is formed; the glass resistance between each two electrodes is the same, and the three-phase alternating current is balanced, has no phase difference and no direct current component.
2. A oxy-fuel combustion electric heating system for large-scale float glass production as defined in claim 1, wherein: and respectively applying 220-460V voltage and power to more than 4000-10000 KW, and adopting a zirconia molybdenum electrode or other types of electrodes.
3. A oxy-fuel combustion electric heating system for large-scale float glass production as defined in claim 1, wherein: the top-blowing fire gun at the upper part of the kiln and the fire gun at the side wall of the kiln comprise an automatic adjustable-stage top-blowing fire gun at the upper part of the kiln, an automatic adjustable-stage fire gun at the side wall of the kiln and a manual adjustable-stage flame oxy-fuel burner; the top-blowing flame gun at the upper part of the automatic adjustable-level kiln is arranged on a kiln steel frame, and flames start from the lower port of the small-diameter inner tube of the top-blowing flame gun at the upper part of the automatic adjustable-level kiln; the top-blowing fire gun at the upper part of the automatic adjustable kiln is provided with an inner pipe and an outer pipe, wherein the inner pipe is used for introducing natural gas, and the outer pipe is used for introducing oxygen; the inner tube is provided with an upper half inner tube and a lower half inner tube which are sleeved together, the sleeved upper half inner tube is driven to move up and down by a transmission system arranged on the outer tube structure of the fire gun, the transmission system is arranged on a traditional system supporting steel structure, and the relative distance between the upper half inner tube and the lower half inner tube is adjusted through the transmission system, so that the whole small-diameter inner tube is lengthened or shortened.
4. A oxy-fuel combustion electric heating system for large-scale float glass production as claimed in claim 3, wherein: the transmission system arranged on the outer tube structure of the fire gun comprises a transmission rack arranged on the upper half of the inner tube, a gear in kneading transmission with the transmission rack and a servo motor for controlling and driving the gear to rotate.
5. A oxy-fuel combustion electric heating system for large-scale float glass production as defined in claim 1, wherein: the kiln steel frame is connected with the burner supporting structure through a bearing; the burner support structure is provided with a mechanical structure for adjusting the inclination angle of the fire gun, the fire gun comprises a top-blowing fire gun at the upper part of the adjustable-stage kiln, and the mechanical structure drives the burner support structure and the top-blowing fire gun at the upper part of the adjustable-stage kiln arranged on the burner support structure to rotate at an angle in the front-back direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210032307.4A CN114538752B (en) | 2022-01-12 | 2022-01-12 | Total oxygen combustion electric heating system for large-scale float plate glass production |
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| CN202210032307.4A CN114538752B (en) | 2022-01-12 | 2022-01-12 | Total oxygen combustion electric heating system for large-scale float plate glass production |
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| CN114538752A CN114538752A (en) | 2022-05-27 |
| CN114538752B true CN114538752B (en) | 2023-07-21 |
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|---|---|---|---|---|
| GB2424644A (en) * | 2005-03-30 | 2006-10-04 | Pilkington Plc | Method of suppressing foam formation during glass manufacture |
| JP5580685B2 (en) * | 2009-08-18 | 2014-08-27 | Ｈｏｙａ株式会社 | Glass manufacturing method, glass melting furnace, glass manufacturing apparatus, glass blank manufacturing method, information recording medium substrate manufacturing method, information recording medium manufacturing method, display substrate manufacturing method and optical component manufacturing method |
| CN202973105U (en) * | 2012-09-24 | 2013-06-05 | 株洲旗滨集团股份有限公司 | Combined combustion gun |
| CN205076971U (en) * | 2015-08-24 | 2016-03-09 | 王立臣 | Oblique flame burner of polyoxy of sheet glass melting furnace |
| CN105217932B (en) * | 2015-08-24 | 2017-08-25 | 王立臣 | A kind of oblique flame combustion method of the polyoxy of Flat Glass Furnace and burner |
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2022
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