CN109336363B

CN109336363B - Glass melting method

Info

Publication number: CN109336363B
Application number: CN201811295758.7A
Authority: CN
Inventors: 田红星
Original assignee: Dongxu Optoelectronic Technology Co Ltd
Current assignee: Dongxu Optoelectronic Technology Co Ltd
Priority date: 2018-11-01
Filing date: 2018-11-01
Publication date: 2022-04-01
Anticipated expiration: 2038-11-01
Also published as: CN109336363A

Abstract

The invention discloses a glass melting method, which is implemented by using a kiln, wherein the kiln comprises the following components: the furnace body is provided with a feeding hole and a discharging hole; the burning gun is arranged on the furnace body, and the electrode is arranged on the furnace body; the glass melting method comprises the following steps: closing the discharge port, adding raw materials into the furnace body through the feed port, and providing heat for the raw materials in the furnace body by utilizing the burning gun and the electrode, wherein in unit time, the heat provided by the burning gun for the raw materials is R1, the heat provided by the electrode for the raw materials is R2, and the ratio of R1 to R2 is within a preset range. By utilizing the glass melting method provided by the embodiment of the invention, the production efficiency and the product yield of glass can be improved, the defects such as bubbles and stripes are eliminated, the consistency and the quality of the glass are improved, and the energy consumption is reduced.

Description

Glass melting method

Technical Field

The invention relates to the field of glass, in particular to a glass melting method.

Background

In the related art, batch materials for manufacturing glass are melted in a furnace, and then molten glass that has been melted flows to a next process for conditioning and forming. The effect of the molten glass in the furnace determines the quality of the glass product.

Disclosure of Invention

The present application is based on the discovery and recognition by the inventors of the following facts and problems: the prior art has been directed to increasing the efficiency of glass production by increasing the amount of heat provided to the raw materials used to produce the glass. Therefore, the skilled person has a technical prejudice which leads the skilled person to think only of increasing the amount of heat supplied to the raw materials used for producing the glass in the face of the technical problem of how to improve the production efficiency of the glass.

After intensive research, the inventor finds that a temperature field in a furnace body of a kiln and generated molten glass circulation not only have great influence on the production efficiency of glass, but also have great influence on the quality of the glass, and the influence is more remarkable particularly on melting glass varieties with higher viscosity and improving the production performance.

The invention aims to overcome the problems in the prior art and provide a glass melting method implemented by using a kiln.

In order to achieve the above object, the glass melting method is carried out using a furnace comprising: the furnace body is provided with a feeding hole and a discharging hole; the burning gun is arranged on the furnace body, and the electrode is arranged on the furnace body; the glass melting method comprises the following steps: closing the discharge port, adding raw materials into the furnace body through the feed port, and providing heat for the raw materials in the furnace body by utilizing the burning gun and the electrode, wherein in unit time, the heat provided by the burning gun for the raw materials is R1, the heat provided by the electrode for the raw materials is R2, and the ratio of R1 to R2 is within a preset range.

By utilizing the glass melting method provided by the embodiment of the invention, the production efficiency and the product yield of glass can be improved, the defects such as bubbles and stripes are eliminated, the consistency and the quality of the glass are improved, and the energy consumption is reduced.

Preferably, the furnace body has a first side wall and a second side wall opposite to each other in a first horizontal direction and a third side wall and a fourth side wall opposite to each other in a second horizontal direction, the feed inlet is provided on at least one of the top wall and the first side wall of the furnace body, the discharge outlet is provided on at least one of the bottom wall and the second side wall of the furnace body, the burning guns are provided on at least one of the third side wall and the fourth side wall, the electrodes are provided on each of the third side wall and the fourth side wall, preferably, the burning guns are located above the electrodes, preferably, the furnace body includes a plurality of heating zones arranged in the first horizontal direction, and each heating zone is provided with at least one burning gun.

Preferably, the burning guns comprise a first burning gun and a second burning gun, the first burning gun is arranged on the third side wall, and the second burning gun is arranged on the fourth side wall; the electrodes comprise a first electrode and a second electrode, the first electrode is arranged on the third side wall, and the second electrode is arranged on the fourth side wall.

Preferably, the glass melting method comprises the steps of: A) closing the discharge hole, adding raw materials into the furnace body through the feed hole, and providing heat for the raw materials in the furnace body by using the burning gun; B) when the material level of the raw materials in the furnace body reaches a first preset value, starting the electrode so as to provide heat for the raw materials in the furnace body; C) continuing to add raw materials into the furnace body through the feeding hole, and increasing the heat provided by the burning gun and the heat provided by the electrode until the ratio of the R1 to the R2 is within the preset range; and D) under the condition that the ratio of the R1 to the R2 is in the preset range, continuously increasing the heat provided by the burning gun and the heat provided by the electrode, and stopping adding the raw materials when the material level of the raw materials in the furnace body reaches a second preset value, wherein the ratio of the first preset value to the second preset value is preferably greater than or equal to 0.2 and less than or equal to 0.4, and more preferably, the ratio of the first preset value to the second preset value is equal to 0.33.

Preferably, the glass melting method further comprises: E) after stopping adding the raw materials, heating the raw materials in the furnace body for a preset time under the condition that the ratio of the R1 to the R2 is in the preset range, preferably, the preset time is 24 hours to 96 hours, and preferably, the glass melting method further comprises the following steps: F) and heating the raw materials in the furnace body for the preset time, opening the discharge hole so as to enable the molten glass to flow out of the furnace body, and adding the raw materials into the furnace body through the feed hole.

Preferably, the step C) includes: c-1) continuously adding raw materials into the furnace body through the feeding hole, and increasing the heat provided by the burning gun and the heat provided by the electrode, wherein the acceleration rate of the heat provided by the burning gun is smaller than that of the heat provided by the electrode; and C-2) when the material level of the raw materials in the furnace body reaches a third preset value, the ratio of the R1 to the R2 is within the preset range, preferably, the ratio of the third preset value to the second preset value is more than or equal to 0.7 and less than 1, and more preferably, the ratio of the third preset value to the second preset value is more than or equal to 0.8 and less than or equal to 0.9.

Preferably, after the material level of the raw materials in the furnace body reaches the second preset value, the sum of the R1 and the R2 is kept at a fourth preset value.

Preferably, the ratio of R1 to R2 is 0.5 or more and 0.8 or less, preferably the ratio of R1 to R2 is 0.55 or more and 0.75 or less, more preferably the ratio of R1 to R2 is 0.58 or more and 0.7 or less, and most preferably the ratio of R1 to R2 is 0.63 or more and 0.66 or less.

Preferably, the burning gun is fueled by natural gas, the R1 ═ V × Q × Kr, the R2 ═ W × 3600KJ/KWh × Ke, where V is a flow rate of the natural gas, Q is a calorific value of the natural gas, Kr is an absorption rate of the heat supplied from the raw material to the natural gas, W is an electric power of the electrode, Ke is an absorption rate of the heat supplied from the raw material to the electrode, 3600KJ/KWh is a fixed parameter value for electric energy and thermal energy conversion, preferably, Kr is equal to or greater than 55% and equal to or less than 75%, more preferably, Kr is equal to or greater than 60% and equal to or less than 70%, most preferably, Kr is equal to or greater than 62% and equal to or less than 68%, preferably, Ke is equal to or greater than 75% and equal to or less than 93%, more preferably, Ke is equal to or greater than 85% and equal to or less than 93%, and most preferably, Ke is equal to or greater than 88% and equal to or less than 90%.

Preferably, under isothermal and isobaric conditions, the oxygen-fuel volume ratio of the burning gun is (2-3): 1, preferably, the oxygen-fuel volume ratio of the burning gun is (2.3-2.7): 1, more preferably, the oxygen-fuel volume ratio of the burning gun is (2.45-2.55): 1, a first heating zone in three adjacent heating zones is adjacent to the feeding hole, a third heating zone in three adjacent heating zones is adjacent to the discharging hole, the sum of the fuel quantities of the burning guns in the first heating zone in three adjacent heating zones is M1, the sum of the fuel quantities of the burning guns in the second heating zone in three adjacent heating zones is M2, and the sum of the fuel quantities of the burning guns in the third heating zone in three adjacent heating zones is M3, wherein the sum of the fuel quantities of the burning guns in the third heating zone in three adjacent heating zones is M1/M2 is not more than 0.95, 1.3 is not less than (M1+ M2)/M3 is not more than 2, preferably, 0.72 is not less than M1/M2 is not more than 0.91, 1.4 is not more than (M1+ M2)/M3 is not more than 1.9, more preferably, 0.77 is not less than M1/M2 is not more than 0.85, and 1.55 is not more than (M1+ M2)/M3 is not more than 1.75.

Drawings

FIG. 1 is a schematic structural diagram of a kiln according to an embodiment of the invention;

fig. 2 is a schematic structural diagram of a kiln according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The present invention provides a glass melting process that is carried out using a furnace 10. A kiln 10 according to an embodiment of the present invention is described below with reference to the accompanying drawings. As shown in fig. 1 and 2, a furnace 10 according to an embodiment of the present invention includes a furnace body 110, a burning gun 120, and an electrode 130. The furnace body 110 is provided with a feed inlet 151 and a discharge outlet 152, the burning gun 120 is arranged on the furnace body 110, and the electrode 130 is arranged on the furnace body 110.

The glass melting method according to the embodiment of the invention comprises the following steps: the discharge port 152 is closed, and the raw material is supplied into the furnace body 110 through the feed port 151, and heat is supplied to the raw material in the furnace body 110 by the burning torch 120 and the electrode 130. Wherein, in unit time, the heat quantity provided by the burning gun 120 to the raw material is R1, the heat quantity provided by the electrode 130 to the raw material is R2, and the ratio of the R1 to the R2 is in a preset range.

Wherein, the heat provided by the burning gun 120 to the raw material is as follows: the portion of the heat dissipated (provided) by lance 120 that is absorbed by the feedstock; the heat provided by the electrode 130 to the feedstock is: the electrode 130 emits (provides) a portion of the heat absorbed by the feedstock. In other words, the raw material absorbs R1 from the heat supplied from the burning torch 120 and R2 from the heat supplied from the electrode 130.

In this application, the raw material should be broadly understood, and the raw material includes not only a solid raw material added into the furnace body 110 through the feed port 151 but also a liquid raw material (molten glass) in the furnace body 110, that is, the raw material in a solid state is transformed into a liquid state by heating.

The glass melting method according to the embodiment of the invention can precisely and timely adjust the temperature field in the furnace body 110 by making the ratio of the R1 to the R2 within a preset range, so as to generate ideal circulation of the molten glass and establish a stable flow state of the molten glass.

Because the glass liquid circulation can be generated in the furnace body 110, that is, the glass liquid circulation exists in the furnace body 110, the melting of the glass liquid can be strengthened, so that the melting efficiency of the glass liquid is improved, the production efficiency of the glass is further improved, the glass liquid in the furnace body 110 can be more uniform and more uniform, the defects of bubbles, stripes and the like in the glass are eliminated, the consistency and the quality of the glass are improved, particularly, the production efficiency and the capacity of the glass with higher melting viscosity can be improved, and the quality and the product yield of the glass with higher melting viscosity are improved.

For example, a front circulation 161 and a rear circulation 162 can be generated in the furnace body 110, and the establishment and stabilization of the front circulation 161 and the rear circulation 162 ensure the molten state and the melting effect of the molten glass in the furnace body 110, so that the melting efficiency and the production efficiency of the furnace 10 can be improved, and the quality and the product yield of the glass can be improved.

Therefore, by using the glass melting method provided by the embodiment of the invention, the production efficiency and the product yield of the glass can be improved, the defects such as bubbles and stripes are eliminated, the consistency and the quality of the glass are improved, and the energy consumption is reduced.

As shown in fig. 1 and 2, in some embodiments of the invention, the kiln 10 can include a furnace body 110, a lance 120, an electrode 130, and a temperature detector 140.

The furnace body 110 may have first and

second side walls

111 and 112 opposite in a first horizontal direction and third and

fourth side walls

113 and 114 opposite in a second horizontal direction. The feed inlet 151 is provided on at least one of the top wall and the first side wall 111 of the furnace body 110, and the discharge outlet 152 is provided on at least one of the bottom wall and the second side wall 112 of the furnace body 110. For example, the first side wall 111 may have an inlet 151 and the second side wall 112 may have an outlet 152.

The burning gun 120 is provided on at least one of the third and

fourth sidewalls

113 and 114, and the electrode 130 is provided on each of the third and

fourth sidewalls

113 and 114. The burning torch 120 is positioned above the electrode 130. Wherein the first horizontal direction may be perpendicular to the second horizontal direction. The first horizontal direction is shown by arrow a in fig. 2, the second horizontal direction is shown by arrow B in fig. 1, and the up-down direction is shown by arrow C in fig. 1.

The burning torch 120 may include a first burning torch 121 and a second burning torch 122, and the electrode 130 may include a first electrode 131 and a second electrode 132. The first burning torch 121 is provided on the third sidewall 113, and the second burning torch 122 is provided on the fourth sidewall 114. The first electrode 131 is disposed on the third sidewall 113, and the second electrode 132 is disposed on the fourth sidewall 114. The temperature detector 140 may be provided on the bottom wall 116.

Preferably, the first burning guns 121 may be plural, the second burning guns 122 may be plural, the plural first burning guns 121 may be provided on the third side wall 113 at intervals along the first horizontal direction, and the plural second burning guns 122 may be provided on the fourth side wall 114 at intervals along the first horizontal direction. The first electrode 131 may be a plurality of electrodes, the second electrode 132 may be a plurality of electrodes, the plurality of first electrodes 131 may be disposed on the third sidewall 113 at intervals along the first horizontal direction, and the plurality of second electrodes 132 may be disposed on the fourth sidewall 114 at intervals along the first horizontal direction.

Therefore, the molten glass in the furnace body 110 can be heated more uniformly, and the structure of the kiln 10 can be more reasonable.

More preferably, the first burning guns 121 may be disposed on the third sidewall 113 at equal intervals along the first horizontal direction, and the second burning guns 122 may be disposed on the fourth sidewall 114 at equal intervals along the first horizontal direction. The plurality of first electrodes 131 may be disposed on the third sidewall 113 at equal intervals along the first horizontal direction, and the plurality of second electrodes 132 may be disposed on the fourth sidewall 114 at equal intervals along the first horizontal direction. Therefore, the molten glass in the furnace body 110 can be heated more uniformly, and the structure of the kiln 10 can be more reasonable.

As shown in fig. 1, each of the first and second burning

guns

121 and 122 may be positioned above each of the first and

second electrodes

131 and 132. The construction of the kiln 10 can thus be made more rational.

A glass melting method according to an embodiment of the present invention may include the steps of:

A) the material outlet 152 is closed, the raw material is fed into the furnace body 110 through the material inlet 151, and heat is supplied to the raw material in the furnace body 110 by the burning torch 120 so as to heat the raw material in a solid state into a liquid state.

B) When the level of the raw material in the furnace body 110 reaches a first preset value, the electrode 130 is activated to supply heat to the raw material in the furnace body 110. When the material level of the raw material in the furnace body 110 reaches the first preset value, most of the solid raw material in the furnace body 110 is heated and melted into a liquid state, so that the raw material has conductivity, and at this time, the electrode 130 can be activated to heat the liquid raw material (molten glass) by using the heat generated by the electrode 130.

C) The raw material is continuously fed into the furnace body 110 through the feed port 151, the heat supplied from the burning torch 120 is increased and the heat supplied from the electrode 130 is increased until the ratio of the R1 to the R2 is within the preset range. As the raw material in the furnace body 110 is increased, the heat supplied from the burning torch 120 is increased and the heat supplied from the electrode 130 is increased. Wherein, the heat provided by the burning gun 120 is: the total heat dissipated by the lance 120; the heat provided by the electrode 130 refers to: the electrodes 130 generate all of the heat electrically.

D) Under the condition that the ratio of the R1 to the R2 is within the preset range, the heat provided by the burning torch 120 and the heat provided by the electrode 130 are continuously increased, and when the material level of the raw material in the furnace body 110 reaches a second preset value, the raw material is stopped to be added. Preferably, a ratio of the first preset value to the second preset value may be greater than or equal to 0.2 and less than or equal to 0.4. Whereby the melting efficiency can be further improved. More preferably, the ratio of the first preset value to the second preset value may be equal to 0.33. Specifically, the second preset value may be 700 mm to 1000 mm.

In one embodiment of the present invention, the step C) may comprise:

c-1) continuously adding the raw material into the furnace body 110 through the feed opening 151, increasing the heat supplied from the burning torch 120 and increasing the heat supplied from the electrode 130. Wherein the rate of increase of the heat provided by the burning torch 120 is smaller than the rate of increase of the heat provided by the electrode 130. Thereby, the ratio of R1 to R2 can be gradually brought close to the predetermined range.

That is, although the R2 increases from zero, since the increase rate of the heat supplied from the burning torch 120 is smaller than the increase rate of the heat supplied from the electrode 130, that is, since the increase rate of the R1 is smaller than the increase rate of the R2, the ratio of the R1 to the R2 gradually decreases, and the ratio of the R1 to the R2 gradually approaches the predetermined range.

C-2) when the level of the raw material in the furnace body 110 reaches a third preset value, the ratio of the R1 to the R2 is within the preset range. That is, as the level of the raw material in the furnace body 110 increases, since the rate of increase of the heat supplied from the burning torch 120 is smaller than the rate of increase of the heat supplied from the electrode 130, the ratio of R1 to R2 gradually approaches the preset range, and when the level of the raw material in the furnace body 110 reaches a third preset value, the ratio of R1 to R2 falls within the preset range. The ratio of R1 to R2 is then maintained within the predetermined range, and the amount of heat provided by the burner 120 is increased and the amount of heat provided by the electrode 130 is increased.

Preferably, the ratio of the third preset value to the second preset value is greater than or equal to 0.7 and less than 1. More preferably, the ratio of the third preset value to the second preset value is greater than or equal to 0.8 and less than or equal to 0.9.

In a specific example of the present invention, after the level of the raw material in the furnace body 110 reaches the second preset value, the sum of the R1 and the R2 is maintained at a fourth preset value.

In other words, as the raw material in the furnace body 110 increases (i.e., as the level of the raw material in the furnace body 110 increases), the amount of heat supplied from the burning torch 120 increases and the amount of heat supplied from the electrode 130 increases, i.e., the R1 increases and the R2 increases. When the material level of the raw material in the furnace body 110 reaches the second preset value, the raw material in the furnace body 110 does not increase any more (i.e. the material level of the raw material in the furnace body 110 does not increase any more), the heat provided by the burning torch 120 does not increase any more, the heat provided by the electrode 130 does not increase any more, i.e. the R1 does not increase any more, the R2 does not increase any more, and the sum of the R1 and the R2 is maintained at the fourth preset value.

By maintaining the sum of the R1 and the R2 at the fourth predetermined value, the heat requirement of the molten glass can be better satisfied, and the temperature field in the furnace body 110 can be more accurately and more rapidly adjusted to generate more ideal circulation of the molten glass.

The fourth preset value is the amount of heat absorbed by the molten glass (raw material) in the furnace body 110 per unit time. The fourth preset value can be determined according to the type of raw material, the yield of the kiln 10, the variety of produced glass, and other factors.

Specifically, the operating temperature of the molten glass in the furnace body 110 is 1530 ℃ to 1650 ℃, that is, the temperature of the molten glass in the furnace body 110 may be 1530 ℃ or higher and 1650 ℃ or lower.

In some examples of the invention, the ratio of R1 to R2 may be greater than or equal to 0.5 and less than or equal to 0.8. Preferably, the ratio of R1 to R2 is 0.55 or greater and 0.75 or less. More preferably, the ratio of R1 to R2 is 0.58 or more and 0.7 or less. Most preferably, the ratio of R1 to R2 is 0.63 or greater and 0.66 or less.

Specifically, the burning gun uses natural gas as fuel, the R1 is V × Q × Kr, the R2 is W × 3600KJ/KWh × Ke, wherein V is the flow rate of the natural gas, Q is the calorific value of the natural gas, Kr is the absorption rate of the feedstock to the heat supplied by the natural gas, W is the electric power of the electrode 130, Ke is the absorption rate of the feedstock to the heat supplied by the electrode 130, and 3600KJ/KWh is a fixed parameter value for conversion of electric energy and thermal energy.

Preferably, Kr is 55% or more and 75% or less, more preferably 60% or more and 70% or less, and most preferably 62% or more and 68% or less. Preferably, Ke is 75% or more and 93% or less, more preferably 85% or more and 93% or less, and most preferably 88% or more and 90% or less. Kr and Ke can be determined depending on the kind of the raw material.

In one example of the present invention, the glass melting method may further include:

E) after the material is stopped, the material in the furnace body 110 is heated for a predetermined time under the condition that the ratio of the R1 to the R2 is within the predetermined range. This further improves the consistency and quality of the glass. Preferably, the preset time may be 24 hours to 96 hours. More preferably, the preset time may be 48 hours to 72 hours.

In a specific example of the present invention, after heating for the preset time, the molten glass in the furnace body 110 may be completely discharged. The discharged molten glass can enter the next process. That is, the glass melting process may be performed intermittently.

In another specific example of the present invention, a glass melting method according to an embodiment of the present invention may further include: F) after the raw material in the furnace body 110 is heated for the preset time, the discharge port 152 is opened and the raw material is added into the furnace body 110 through the feed port 151.

In other words, after the raw material in the furnace body 110 is heated for the predetermined time, the raw material is fed into the furnace body 110 through the feed inlet 151 while discharging the molten glass through the discharge outlet 152. That is, the glass melting method can be continuously performed.

Preferably, after the raw material in the furnace body 110 is heated for the preset time, the amount of the raw material added into the furnace body 110 through the feed port 151 is slightly larger than the amount of the molten glass discharged through the discharge port 152, so that the level of the raw material in the furnace body 110 is maintained at the second preset value. This is because a small amount of the added raw material is volatilized.

As shown in fig. 2, the furnace body 110 includes a plurality of heating zones 117 arranged along the first horizontal direction, and each heating zone 117 is provided with at least one burning gun 120. The glass melting method according to an embodiment of the present invention further includes: the oxygen-fuel volume ratio of the burning torch 120 is within a preset range, and the fuel quantity of the burning torch 120 in the adjacent three

heating areas

117a, 117b, 117c satisfies a preset relationship. The oxygen-fuel volume ratio of the lance 120 refers to the volume ratio of oxygen and fuel injected by the lance 120. The fuel may be natural gas.

The glass melting method according to the embodiment of the invention can precisely and timely adjust the temperature field in the furnace body 110 by making the oxygen-fuel volume ratio of the burning torch 120 in the preset range and making the fuel amount of the burning torch 120 in the adjacent three

heating zones

117a, 117b and 117c satisfy the preset relationship, so as to generate ideal circulating flow of the molten glass and establish stable flow state of the molten glass.

In the step C) of the glass melting method according to the embodiment of the present invention, the fuel property and the fuel amount of the burning torch 120 are adjusted so that the fuel amount of the burning torch 120 located in the adjacent three

heating zones

117a, 117b, 117C with the oxygen-fuel volume ratio of the burning torch 120 within the preset range satisfies the preset relationship.

In the glass melting method according to the embodiment of the present invention, it is possible (possibly) that the material level of the raw material in the furnace body 110 reaches the second preset value first, and then it is achieved that the oxygen-fuel volume ratio of the burning torch 120 in the preset range satisfies the preset relationship with respect to the fuel amount of the burning torch 120 located in the adjacent three

heating zones

117a, 117b, 117c, that is, the process of adjusting the fuel property and the fuel amount of the burning torch 120 is relatively long; it is also possible (or possible) to first realize that the oxygen-fuel volume ratio of the burning torch 120 in the preset range and the fuel amount of the burning torch 120 in the adjacent three

heating zones

117a, 117b, 117c satisfy the preset relationship, that is, the process of adjusting the fuel property and the fuel amount of the burning torch 120 is relatively short, and then the material level in the furnace body 110 reaches the second preset value.

The oxygen-to-fuel volume ratio of the lance 120 may be (2-3): 1. therefore, the temperature field in the furnace body 110 can be adjusted more accurately and more timely, and more ideal glass liquid circulation can be generated. Preferably, the oxygen-fuel volume ratio of the lance 120 may be (2.3-2.7): 1. more preferably, the oxygen-fuel volume ratio of the burning gun may be (2.45-2.55): 1.

preferably, the oxygen-fuel volume ratio of the above-mentioned burning torch 120 may be the oxygen-fuel volume ratio of the burning torch 120 under the isothermal and isobaric conditions. Specifically, if the temperature and/or pressure of the oxygen is not equal to the temperature and/or pressure of the fuel, the volume of the oxygen may be converted to the volume at the temperature and pressure of the fuel, or the volume of the fuel may be converted to the volume at the temperature and pressure of the oxygen, and then the oxygen-to-fuel volume ratio of the burner 120 may be calculated. Thereby more reasonably controlling the oxygen to fuel volume ratio of the lance 120.

A first heater zone 117a of the adjacent three

heater zones

117a, 117b, 117c may be adjacent to the inlet 151, and a third heater zone 117c of the adjacent three

heater zones

117a, 117b, 117c may be adjacent to the outlet 152. In other words, for the adjacent three

heating zones

117a, 117b, 117c, the first heating zone 117a is more adjacent to the feeding port 151 than the second heating zone 117b and the third heating zone 117c, and the third heating zone 117c is more adjacent to the discharging port 152 than the first heating zone 117a and the second heating zone 117 b.

The sum of the amounts of fuel of the burning guns 120 located at the first heating zone 117a of the adjacent three

heating zones

117a, 117b, 117c may be M1, the sum of the amounts of fuel of the burning guns 120 located at the second heating zone 117b of the adjacent three

heating zones

117a, 117b, 117c may be M2, and the sum of the amounts of fuel of the burning guns 120 located at the third heating zone 117c of the adjacent three

heating zones

117a, 117b, 117c may be M3. For example, there are five burning guns 120 located in the first heating area 117a, and the sum of the fuel amounts (injected) of these five burning guns 120 may be M1.

Wherein, M1/M2 is more than or equal to 0.7 and less than or equal to 0.95, and (M1+ M2)/M3 is more than or equal to 1.3 and less than or equal to 2. Therefore, the temperature field in the furnace body 110 can be adjusted more accurately and more timely, and more ideal glass liquid circulation can be generated. Preferably, 0.72. ltoreq. M1/M2. ltoreq.0.91, 1.4. ltoreq. M1+ M2)/M3. ltoreq.1.9. More preferably, 0.77. ltoreq. M1/M2. ltoreq.0.85, 1.55. ltoreq. M1+ M2)/M3. ltoreq.1.75.

As shown in fig. 2, in particular, the furnace body 110 may include three

heating zones

117a, 117b, 117c arranged in the first horizontal direction. Therefore, the difficulty of accurately and timely adjusting the temperature field in the furnace body 110 can be reduced under the condition of generating ideal glass liquid circulation. The heating zone 117 may be a portion of the furnace body 110 in fig. 2 between two adjacent dotted lines.

The distance between the first side wall 111 and the second side wall 112 in the first horizontal direction may be L, and the length of each heating area 117 in the first horizontal direction may be greater than or equal to 0.25L and less than or equal to 0.45L.

Preferably, the length of each heating region 117 in the first horizontal direction may be equal to or greater than 0.3L and equal to or less than 0.35L. More preferably, the length of each heating region 117 in the first horizontal direction may be equal to 0.33L. The range of movement of the boundary of each heating zone 117 can thereby be enlarged, so that the operational flexibility of the glass melting method can be increased.

For example, when the length of each heating zone 117 in the first horizontal direction is greater than or equal to 0.3L and less than or equal to 0.35L, the boundary of the second heating zone 117b may move 0.05L in the direction adjacent to the inlet 151 and 0.1L in the direction adjacent to the outlet 152.

Wherein the temperature of the molten glass spaced apart (distance) 0.6L from the feeding opening 151 in the first horizontal direction is the highest, and is herein referred to as a hot spot. The molten glass becomes lower in density and floats at the hot spot position due to thermal expansion, and the molten glass forms a front circulation 161 and a rear circulation 162 which are opposite in flow direction on both sides of the hot spot. The molten glass is strengthened by the existence of the front circulation 161 and the rear circulation 162, and the molten glass flows out from the discharge port 152 along with the working flow 163 driven by the feeding and discharging of the furnace body 110, and then enters the next process.

Experimental example 1: the flow rate of the glass liquid is 8 tons/day, the product is TFT-LCD glass, wherein the ratio of the R1 to the R2 is equal to 0.5. The bubble and stripe defects are within 3 percent, and the product meets the quality requirement.

Experimental example 2: the flow rate of the glass liquid is 10 tons/day, the product is TFT-LCD glass, wherein the ratio of the R1 to the R2 is equal to 0.63. The bubble and stripe defects are within 3 percent, and the product meets the quality requirement.

Experimental example 3: the flow rate of the molten glass was 14 tons/day, and the product was LTPS glass, wherein the ratio of R1 to R2 was equal to 0.8. The bubble and stripe defects are within 4.7 percent, and the product meets the quality requirement.

Experimental example 4: the glass liquid flow rate is 8 tons/day, the product is TFT-LCD glass, wherein the ratio of R1 to R2 is equal to 0.5, the oxygen-fuel ratio is 2.4, M1/M2 is 0.7, and (M1+ M2)/M3 is 2. The reject ratio of bubbles and stripes is within 2 percent, and the product meets the quality requirement.

Experimental example 5: the glass liquid flow rate is 10 tons/day, the product is TFT-LCD glass, wherein the ratio of R1 to R2 is equal to 0.63, the oxygen-fuel ratio is 2, M1/M2 is 0.95, (M1+ M2)/M3 is 1.3. The reject ratio of bubbles and stripes is within 2 percent, and the product meets the quality requirement.

Experimental example 6: the glass flow rate is 14 tons/day, the product is LTPS glass, wherein the ratio of R1 to R2 is equal to 0.8, the oxygen-fuel ratio is 3, and M1/M2 is 0.77, (M1+ M2)/M3 is 1.75. The defect rate of bubbles and stripes is less than 3.4 percent, and the product meets the quality requirement.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A glass melting method, characterized in that it is carried out with a furnace comprising:

the furnace body is provided with a feeding hole and a discharging hole; and

the burning torch is arranged on the furnace body, and the electrode is arranged on the furnace body;

the glass melting method comprises the following steps: closing the discharge port, adding raw materials into the furnace body through the feed port, and providing heat for the raw materials in the furnace body by using the burning gun and the electrode, wherein in unit time, the heat provided by the burning gun for the raw materials is R1, the heat provided by the electrode for the raw materials is R2, and the ratio of the R1 to the R2 is within a preset range;

the burning gun takes natural gas as fuel, the R1 is V multiplied by Q multiplied by Kr, the R2 is W multiplied by 3600KJ/KWh multiplied by Ke, wherein V is the flow rate of the natural gas, Q is the heat value of the natural gas, Kr is the absorption rate of the raw material to the heat provided by the natural gas, W is the electric power of the electrode, Ke is the absorption rate of the raw material to the heat provided by the electrode, 3600KJ/KWh is a fixed parameter value for conversion between electric energy and heat energy, and the ratio of the R1 to the R2 is more than or equal to 0.63 and less than or equal to 0.66;

the furnace body comprises a plurality of heating zones arranged along a first horizontal direction, each heating zone is provided with at least one burning gun, the first heating zone in the adjacent three heating zones is adjacent to the feeding hole, the third heating zone in the adjacent three heating zones is adjacent to the discharging hole, the sum of the fuel quantities of the burning guns in the first heating zone in the adjacent three heating zones is M1, the sum of the fuel quantities of the burning guns in the second heating zone in the adjacent three heating zones is M2, and the sum of the fuel quantities of the burning guns in the third heating zone in the adjacent three heating zones is M3, wherein the sum of the fuel quantities of the burning guns in 0.77-M1/M2-0.85 is more than or equal to 1.55-1 (M1+ M2)/M3-1.75;

after the raw material is stopped, heating the raw material in the furnace body for a preset time which is 24-96 hours under the condition that the ratio of the R1 to the R2 is in the preset range.

2. The glass melting method according to claim 1, wherein the furnace body has a first side wall and a second side wall opposing each other in the first horizontal direction and a third side wall and a fourth side wall opposing each other in the second horizontal direction, wherein the feed port is provided in at least one of a top wall and the first side wall of the furnace body, the discharge port is provided in at least one of a bottom wall and the second side wall of the furnace body, the burning torch is provided in at least one of the third side wall and the fourth side wall, and the electrode is provided in each of the third side wall and the fourth side wall.

3. The glass melting method of claim 2, wherein the lance is positioned above the electrode.

4. The glass melting method according to claim 2,

the burning guns comprise a first burning gun and a second burning gun, the first burning gun is arranged on the third side wall, and the second burning gun is arranged on the fourth side wall;

the electrodes comprise a first electrode and a second electrode, the first electrode is arranged on the third side wall, and the second electrode is arranged on the fourth side wall.

5. The glass melting method according to claim 1, comprising the steps of:

A) closing the discharge hole, adding raw materials into the furnace body through the feed hole, and providing heat for the raw materials in the furnace body by using the burning gun;

B) when the material level of the raw materials in the furnace body reaches a first preset value, starting the electrode so as to provide heat for the raw materials in the furnace body;

C) continuing to add raw materials into the furnace body through the feeding hole, and increasing the heat provided by the burning gun and the heat provided by the electrode until the ratio of the R1 to the R2 is within the preset range; and

D) under the condition that the ratio of the R1 to the R2 is in the preset range, the heat quantity provided by the burning gun and the heat quantity provided by the electrode are continuously increased, and when the material level of the raw materials in the furnace body reaches a second preset value, the raw materials are stopped being added.

6. The glass melting method according to claim 5, wherein a ratio of the first preset value to the second preset value is 0.2 or more and 0.4 or less.

7. The glass melting method according to claim 6, wherein a ratio of the first preset value to the second preset value is equal to 0.33.

8. The glass melting method according to claim 5, further comprising: E) and heating the raw materials in the furnace body for the preset time, opening the discharge hole so as to enable the molten glass to flow out of the furnace body, and adding the raw materials into the furnace body through the feed hole.

9. The glass melting method according to claim 5, wherein the step C) comprises:

c-1) continuously adding raw materials into the furnace body through the feeding hole, and increasing the heat provided by the burning gun and the heat provided by the electrode, wherein the acceleration rate of the heat provided by the burning gun is smaller than that of the heat provided by the electrode; and

c-2) when the material level of the raw materials in the furnace body reaches a third preset value, the ratio of the R1 to the R2 is within the preset range.

10. The glass melting method according to claim 9, wherein a ratio of the third preset value to the second preset value is greater than or equal to 0.7 and less than 1.

11. The glass melting method according to claim 10, wherein a ratio of the third preset value to the second preset value is 0.8 or more and 0.9 or less.

12. The glass melting method of claim 5, wherein the sum of R1 and R2 is maintained at a fourth preset value after the level of raw material in the furnace body reaches the second preset value.

13. The glass melting method of any one of claims 1-12, wherein the Kr is 55% or more and 75% or less.

14. The glass melting method according to claim 13, wherein Kr is 60% or more and 70% or less.

15. The glass melting method according to claim 14, wherein Kr is 62% or more and 68% or less.

16. The glass melting method according to claim 15, wherein Ke is 75% or more and 93% or less.

17. The glass melting method according to claim 16, wherein Ke is 85% or more and 93% or less.

18. The glass melting method according to claim 17, wherein Ke is 88% or more and 90% or less.

19. The glass melting method according to any one of claims 1 to 12,

under the condition of isothermal and isobaric pressure, the oxygen-fuel volume ratio of the burning gun is (2-3): 1.

20. the glass melting method of claim 19, wherein the oxygen to fuel volume ratio of the lance is (2.3-2.7): 1.

21. the glass melting method of claim 20, wherein the oxygen to fuel volume ratio of the lance is (2.45-2.55): 1.