Combustion method of glass furnace

Abstract

The present invention discloses a combustion method for a glass kiln, wherein a side-burning spray gun is arranged on the side wall of the nozzle brick of the glass kiln to heat and clarify the glass batch in the glass kiln melting pool, and the fuel in the side-burning spray gun is selected from fossil fuels, and a second hydrogen combustion spray gun and a third hydrogen combustion spray gun are respectively arranged above and below the side-burning spray gun to heat and clarify the glass batch in the glass kiln melting pool, and the fuel in the hydrogen combustion spray gun is selected from hydrogen. The combustion method can increase the flame coverage area, improve the heating and melting efficiency, and reduce the amount of carbon-based fuel, thereby reducing the emission of CO2 during the combustion process; it can also prevent the flame from drifting upward and burning the arch and breast wall.

Description

Technical Field

[0001] The invention relates to the technical field of glass production, and in particular to a combustion method of a glass kiln. Background Art

[0002] Glass companies are major carbon dioxide emitters. Taking flat glass as an example, the total glass production in 2021 was 1.02 billion weight boxes, and the industry's carbon dioxide emissions were 28 million tons, of which carbon dioxide emissions from fossil fuels accounted for as much as 60%.

[0003] The melting step of glass production is one of the processes that emits the most carbon dioxide. The existing melting technology is to melt the glass batch material in the glass melting furnace through the heat generated by the combustion of fuel to make it into glass liquid. The main way to melt the glass batch material is to set up multiple fuel spray guns at intervals on the side wall or top of the glass melting furnace. The fuel spray guns installed on the side wall are usually called side-burning spray guns (the position of the side-burning spray guns is at the same level as the small furnace for spraying combustion aids between the two side spray guns), and the fuel spray guns installed on the top (such as the big arch) are usually called top-burning spray guns. The fuel is sprayed into the glass melting furnace through the spray gun, and meets the combustion aid (air or oxygen) sprayed into the small furnace to produce heat by combustion reaction. The generated heat heats and melts the glass batch material in the glass furnace and forms a clear and uniform glass liquid at a certain temperature.

[0004] At present, the main fuels used in the glass melting process are natural gas, heavy oil, coal tar, petroleum coke powder and coal gas (coal gas is a mixed gas composed of CO, H2, methane, etc.). No matter which of the above fuels is used, they are all traditional fossil fuels. The main chemical composition is two or three elements of C, H, and O, and the C content is the highest. The main products after the fuel is burned are CO2, H2O, etc. In order to reduce the emission of CO2, methods such as improving the combustion efficiency (such as increasing the amount of combustion aid, or using oxygen to replace air as a combustion aid) or improving the flue gas treatment efficiency (such as end absorption and storage of CO2, etc.) can be used. However, these methods cannot fundamentally solve the problem of large CO2 production. Replacing fossil fuels with green fuels to reduce carbon dioxide emissions is one of the fastest and most effective ways, so a new combustion method is needed. Although hydrogen is a green and clean energy with high calorific value, it can replace traditional fossil fuels to reduce CO2 generation. However, hydrogen has an active chemical property and produces a short flame. Simply replacing existing fossil fuels with hydrogen in the spray gun system of an existing glass furnace can easily burn the furnace and the spray gun system. Summary of the invention

[0005] The purpose of the present invention is to provide a combustion method for a glass furnace that reduces the amount of CO2 generated in order to address the technical defects in the prior art. A side-burning spray gun is used on the side wall of the glass furnace nozzle brick to heat and clarify the glass batch in the glass furnace molten pool. The fuel in the side-burning spray gun is fossil fuel. A second hydrogen combustion spray gun and a third hydrogen combustion spray gun are respectively added above and below the side-burning spray gun to heat and clarify the glass batch in the glass furnace molten pool. The fuel in the hydrogen combustion spray gun is hydrogen. The flow rate of the fossil fuel in the side-burning spray gun is 50-170Nm 3 / h, the pressure is 0.012-0.02MPa.

[0006] The first hydrogen energy combustion spray gun installed inside the side burning spray gun is used to heat and clarify the glass batch in the glass furnace molten pool, and the gun head of the first hydrogen energy combustion spray gun extends 15-35cm from the side burning spray gun to the inside of the glass furnace. The fuel in the first hydrogen energy combustion spray gun is hydrogen, and the flow rate of hydrogen is 20-60Nm 3 / h, the pressure is 0.005-0.01MPa.

[0007] The second hydrogen combustion spray gun is located 15-20 cm above the side burning spray gun, and its gun head extends into the glass furnace toward the glass liquid. The angle between the second hydrogen combustion spray gun and the horizontal direction is 5-15°, and the distance between the gun head and the plane where the inner wall of the breast wall of the glass furnace is located is 20-36 cm. The flow rate of hydrogen is 30-50 Nm 3 / h, the pressure is 0.015-0.025MPa.

[0008] The third hydrogen combustion spray gun is located 10-15 cm below the side burning spray gun, and its gun head extends into the glass furnace, and the distance from the plane of the inner wall of the breast wall is 20-35 cm. The flow rate of hydrogen is 20-65 Nm 3 / h, pressure is 0.004-0.008MPa;

[0009] Preferably, the third hydrogen energy combustion spray gun is equipped with a combustion medium spray gun, and the gun head of the combustion medium spray gun extends 6-11 cm from the third hydrogen energy combustion spray gun to the inside of the glass furnace;

[0010] More preferably, when the combustion medium is air, the air flow rate is 5-16Nm 3 / h, pressure 0.05-0.18MPa; when the combustion medium is oxygen, the flow rate is 2.5-10Nm 3 / h, pressure 0.1-0.25MPa; or close the combustion medium spray gun.

[0011] Alternatively, the third hydrogen combustion lance is located 8-15 cm below the side burning lance and its lance head extends into the glass furnace, and the distance from the plane of the inner wall of the breast wall is 10-16 cm, and the flow rate of hydrogen is 50-180 Nm 3 / h, pressure is 0.004-0.008MPa;

[0012] Furthermore, a plurality of combustion-supporting medium spray guns are installed inside the third hydrogen energy combustion spray gun, the combustion-supporting medium spray guns are evenly distributed inside the third hydrogen energy combustion spray gun, and the gun heads of the combustion-supporting medium spray guns extend outwards from the third hydrogen energy combustion spray gun by 6-11 cm;

[0013] Preferably, there are 4-6 combustion medium spray guns. When the combustion medium is air, the air flow rate of each combustion medium spray gun is 5-16Nm 3 / h, pressure 0.05-0.18MPa; when the combustion medium is oxygen, the flow rate of each combustion medium spray gun is 2.5-10Nm 3 / h, pressure 0.1-0.25MPa; or close the combustion medium spray gun.

[0014] A fourth hydrogen combustion spray gun is provided 30-45 cm below the side-burning spray gun, and its gun head extends into the glass furnace, and the distance from the plane where the inner wall of the breast wall is located is 8-12 cm. The fourth hydrogen combustion spray gun is used to heat and clarify the glass batch in the glass furnace molten pool, wherein the fuel is hydrogen, and the flow rate of hydrogen is 20-30 Nm 3 / h. When used with the fourth hydrogen energy combustion spray gun, the flow rate of the second hydrogen energy combustion spray gun is 90-150Nm 3 / h, the pressure is 0.015-0.025MPa.

[0015] Two third hydrogen combustion spray guns are symmetrically arranged along the length direction of the kiln below each side burning spray gun. The vertical distance between the third hydrogen combustion spray gun and the side burning spray gun is 10-20cm, and the gun head extends into the glass kiln, and the distance from the plane where the inner wall of the breast wall is located is 10-16cm. The hydrogen flow rate of the third hydrogen combustion spray gun is 20-50Nm 3 / h, the pressure is 0.004-0.008MPa.

[0016] Two third hydrogen combustion spray guns are symmetrically arranged along the length direction of the kiln below each side burning spray gun. The vertical distance between the third hydrogen combustion spray gun and the side burning spray gun is 10-20cm, and the gun head extends into the glass kiln, and the distance from the plane where the inner wall of the breast wall is located is 10-16cm. The hydrogen flow rate of the third hydrogen combustion spray gun is 20-50Nm 3 / h, the pressure is 0.004-0.008MPa.

[0017] One or more fifth hydrogen combustion spray guns are arranged between two adjacent side-burning spray guns in the furnace, and the distance between the gun head and the plane where the inner wall of the breast wall is located is 5-8 cm. The fifth hydrogen combustion spray gun is used to heat and clarify the glass batch in the melting pool of the glass furnace. The fuel of the fifth hydrogen combustion spray gun is hydrogen, and the flow rate of hydrogen is 130-220Nm 3 / h;

[0018] Preferably, a combustion-supporting medium spray gun is installed inside the fifth hydrogen combustion spray gun, and high-pressure gas is introduced into the combustion-supporting medium spray gun, and the pressure is 0.3-0.7MPa;

[0019] More preferably, the high pressure gas is high pressure air, and the high pressure air flow rate is 5-16Nm 3 / h; or the high-pressure gas is high-pressure oxygen, and the high-pressure oxygen flow rate is 2.5-10Nm 3 / h; or the high-pressure gas is high-pressure nitrogen, and the high-pressure nitrogen flow rate is 2-7Nm 3 / h.

[0020] The spray gun system used in the combustion method of the present invention is improved and optimized on the basis of making full use of the existing spray guns that feed fossil fuels, including adding a hydrogen combustion spray gun inside the existing side-burning spray gun, and adding a hydrogen combustion spray gun on the upper part and / or lower part of the existing side-burning spray gun. When the spray gun system is used for combustion, the flame sprayed by the side-burning spray gun with the hydrogen combustion spray gun added inside is a mixed flame of a carbon-based fuel (traditional fossil fuel) flame wrapped around a hydrogen flame, and due to the high internal hydrogen pressure, the mixed flame forms a long flame, which can increase the flame coverage area, improve the heating and melting efficiency, and reduce the amount of carbon-based fuel, thereby reducing the emission of CO2 during the combustion process. The flame sprayed by the hydrogen combustion spray gun added to the upper part of the side-burning spray gun with the gun head tilted downward (toward the direction of the glass liquid) can form a flame curtain to block the long flame below and prevent the flame below from drifting upward and burning the arch and breast wall. The hydrogen combustion spray gun added at the bottom of the side-burning spray gun will produce water vapor during combustion. The water vapor attached to the surface of the glass material liquid can reduce the viscosity of the surface glass material liquid, accelerate the melting of the glass batch and the clarification of the glass material liquid, reduce fuel consumption, and reduce the emission of CO2 during the combustion process. In addition, the spray gun system has low modification cost for existing glass furnaces.

[0021] The hydrogen combustion spray gun located at the bottom of the side-burning spray gun can add the amount of combustion aids such as air or oxygen according to the specific working conditions. The fuel and combustion aid in the spray gun are above the relatively closed glass material liquid surface. After adding the combustion aid, it can react quickly and burn quickly, accelerate the radiation heat transfer of the flame to the glass material liquid, and generate an oxidizing flame at the same time, which is helpful for the melting of the glass batch. The introduction of the combustion aid can also be closed according to the specific working conditions. At this time, the hydrogen fuel sprayed by the hydrogen combustion spray gun will absorb the combustion medium sprayed by the upper side-burning spray gun, thereby forming a local reducing flame at the surface of the glass material liquid, which is helpful to protect the reducing agent in the glass batch and the clarification of the glass material liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the front longitudinal section of the structure of the spray gun system in the combustion method of Example 1;

[0023] Figure 2 The figure is a side view schematic diagram of the structure of the spray gun system in the combustion method of Example 1;

[0024] Figure 3 The figure is a schematic diagram of the front longitudinal section of the structure of the spray gun system in the combustion method of Example 2;

[0025] Figure 4 Shown is a side view schematic diagram of the structure of the spray gun system in the combustion method of Example 2;

[0026] Figure 5 The figure is a side view schematic diagram of the structure of the spray gun system in the combustion method of Example 3;

[0027] Figure 6 Shown is a schematic diagram of the structure of an existing glass kiln;

[0028] In the figure: 1-side burning spray gun; 2-combustion medium spray gun; 31-first hydrogen energy combustion spray gun; 32-second hydrogen energy combustion spray gun; 33-third hydrogen energy spray gun; 34-fourth hydrogen energy spray gun; 35-fifth hydrogen energy spray gun; 4-breast wall; 5-small furnace; 6-nozzle brick. DETAILED DESCRIPTION

[0029] like Figure 6As shown, the combustion spray gun system of the existing glass kiln usually includes a side-firing spray gun 1 (usually located at the same horizontal position as the small furnace) arranged in the nozzle brick 6, the nozzle brick 6 is built between the breast wall 4 and the pool wall, and sometimes also includes a top-firing spray gun arranged on the inner side of the large arch, and traditional fossil fuels (such as methane CH4) are introduced into the spray gun. The fuel meets the combustion-supporting agent (air and / or oxygen) introduced into the small furnace at the muzzle (nozzle) of the gun head to generate a combustion reaction to produce flames, thereby melting the glass batch into glass liquid. After an in-depth study of the operating conditions of the current mainstream glass kilns and the combustion methods of the spray gun systems, the present invention transforms and optimizes the spray gun systems of the existing glass kilns. While retaining the original spray guns that introduce traditional fossil fuels as much as possible, hydrogen combustion spray guns are added to partially replace traditional fossil fuels with green and clean fuel - hydrogen. Various parameters of the combustion process are determined, such as the type of fuel introduced into each spray gun, the location of the spray gun, the flow rate and pressure of the fuel, etc., ultimately achieving the purpose of effectively reducing CO2 emissions in the combustion process and reducing hydrogen consumption.

[0030] The following is a more detailed description of the present invention with reference to specific embodiments, and further elaboration of the present invention, but these embodiments are by no means intended to limit the present invention.

[0031] Example 1

[0032] The combustion spray gun system used in the combustion method provided in this embodiment has the following improvements: Figure 1 and 2 As shown:

[0033] 1. A first hydrogen combustion spray gun 31 is added inside the existing side burning spray gun 1 (it can be set horizontally or tilted downward so that the gun head faces the glass material liquid and the angle with the horizontal direction is 3-8°). The first hydrogen combustion spray gun 31 is set inside the side burning spray gun 1 (it can be coaxial or not coaxial), and the gun head extends outward from the side burning spray gun 1 by 15-35cm. The flow rate of the first hydrogen combustion spray gun 31 is 20-60Nm 3 / h, the pressure is 0.005-0.01MPa; the natural gas flow rate in the side-burning spray gun is 50-170Nm 3 / h (the flow rate of the side-burning spray gun in a conventional kiln without a hydrogen spray gun is 100-200Nm 3 / h), with a pressure of 0.012-0.02MPa. Since hydrogen combustion produces water vapor, which is relatively light, it will carry the flame upward and drift toward the arch. During combustion, the pressure of the hydrogen in the first hydrogen combustion spray gun 31 and the pressure of the natural gas in the side-burning spray gun are mainly controlled, so that the flame of the first hydrogen combustion spray gun 31 is shorter than the flame sprayed by the side-burning spray gun 1, and the flame of the hydrogen combustion is wrapped with the flame of the natural gas combustion, ensuring that the end of the flame is the flame produced by the combustion of natural gas, so as to avoid water vapor carrying the flame and burning the arch. The side-burning spray gun 1 sprays a flame of carbon-based fuel (traditional fossil fuel), which wraps the hydrogen flame of the first hydrogen combustion spray gun to form a mixed flame, and due to the high internal hydrogen pressure, the mixed flame forms a long flame, which can increase the flame coverage area and avoid burning the breast wall 4, improve the heating and melting efficiency, and reduce the amount of carbon-based fuel, thereby reducing the emission of CO2 during the combustion process.

[0034] 2. A second hydrogen combustion spray gun 32 (which can be as shown in FIG. 1 ) is provided on the upper part of the side burning spray gun 1 with the gun head tilted downward. Figure 2 As shown, it is a round tube), the flow rate of hydrogen is 30-50Nm 3 / h, the pressure is 0.015-0.025MPa, the second hydrogen combustion spray gun 32 is set at 15-20cm above the side burning spray gun 1, one-to-one with the position of the side burning spray gun below, on the same horizontal line (that is, there is no height difference in the vertical direction), and extends out of the nozzle brick into the kiln, the extended length is 20-36cm from the plane where the breast wall is located, and the angle with the horizontal direction is 5-15°. The angle of the second hydrogen combustion spray gun 32 and the distance between it and the side burning spray gun 1 can block the flame of the lower side burning spray gun 1 to prevent the flame from drifting upward and burning the large arch and breast wall; if the angle is too small, the effect of preventing the flame from drifting upward is limited; if the angle is too large, it will cross with the flame generated by the side burning spray gun below, affecting the state, shape and combustion of the original flames, and affecting the radiation heat transfer to the glass; and if the angle is too large, the airflow generated by the flame will impact the surface of the glass material liquid, disturb the glass material liquid flow, and affect the clarification effect of the glass material liquid.

[0035] 3. A third hydrogen combustion spray gun 33 is added to the lower part of the existing side-burning spray gun 1 (it can be set horizontally or tilted downward so that the gun head faces the glass material liquid and the angle with the horizontal direction is 3-8°). The position is 10-15cm directly below the side-burning spray gun 1, corresponding to the position of the upper side-burning spray gun, and the nozzle brick extends into the kiln. The extended length is 20-35cm from the plane where the breast wall is located, and the hydrogen flow rate is 20-65Nm 3 / h, the pressure is 0.004-0.008MPa, and the third hydrogen combustion spray gun 33 is closer to the glass liquid surface in the longitudinal direction, which is conducive to radiating the energy of flame combustion to the glass liquid and accelerating the radiation heat transfer of flame to the glass liquid. At the same time, a combustion medium spray gun 2 is added inside it, and the combustion medium spray gun 2 is installed in the third hydrogen combustion spray gun 33 (coaxial or non-coaxial), and extends 6-11cm from the third hydrogen combustion spray gun 33 to the glass furnace. When in use, the combustion medium can be introduced into the air (flow rate 5-16Nm 3 / h, pressure 0.05-0.18MPa), oxygen can also be introduced (flow rate 2.5-10Nm 3 / h, pressure 0.1-0.25MPa), or no combustion medium may be introduced (flow rate = 0). When the combustion medium is introduced into the third hydrogen energy combustion spray gun 33, and the molar ratio of H2:O2 is less than 2:1, an oxidizing flame is generated, which is helpful for melting the glass. When only hydrogen (no combustion medium) or the molar ratio of H2:O2 is greater than 2:1 is introduced into the third hydrogen energy combustion spray gun 33, the hydrogen will absorb the combustion medium sprayed from the upper small furnace (side-burning spray gun), so that the local position covered by the flame of the third hydrogen energy combustion spray gun 33 forms a reducing flame, which is helpful for protecting the reducing agent in the glass batch and clarifying the glass liquid; that is, the present embodiment can choose whether to introduce the combustion medium according to different working conditions. When the glass liquid is in the melting zone of the melting pool, the combustion medium is introduced; when it is in the clarification zone, the combustion medium is not introduced, or when it is necessary to protect the reducing agent in the glass batch, the combustion medium may not be introduced.

[0036] Taking a 600t / d glass production line as an example, the combustion spray gun system of this embodiment is used to melt the ordinary soda-lime-silica glass batch to 1580°C, wherein the first hydrogen energy combustion spray gun 31 extends outward from the side combustion spray gun 1 by 25cm, and the hydrogen flow rate is 40Nm 3 / h, the pressure is 0.008MPa, and the natural gas flow rate in the side-burning spray gun is up to 80Nm 3 / h, the pressure is 0.016MPa. The hydrogen flow rate of the second hydrogen combustion spray gun 32 is 40Nm 3 / h, with a pressure of 0.02MPa, and is located 18cm above the side-burning spray gun 1 and extends into the glass furnace. The distance from the plane where the inner wall of the breast wall is located is 26cm, and the angle with the horizontal direction is 10°. The third hydrogen combustion spray gun 33 is located 10cm below the side-burning spray gun 1 and extends into the glass furnace. The distance from the plane where the inner wall of the breast wall is located is 30cm, and the hydrogen flow rate is 40Nm 3 / h, the pressure is 0.006MPa. No combustion medium is introduced into the combustion medium spray gun 2. The annual CO2 emission is 108,000-121,000 tons, and the annual hydrogen consumption is 1,051,200 Nm 3; The existing glass furnace combustion method and spray gun system (using natural gas as fuel) will emit 145,000 tons of CO2 per year (10,000 tons of CO2 emissions is equivalent to consuming 10 million Nm 3 produced by combustion of natural gas).

[0037] Comparative Example 1-1: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 1, except that the first hydrogen energy combustion spray gun 31 was set inside the side burning spray gun 1 and extended outward by 10 cm from the side burning spray gun 1, and the flow rate of the first hydrogen energy combustion spray gun 31 was 70 Nm 3 / h, the pressure is 0.008MPa; the fuel (natural gas) flow rate of the side-burning spray gun is 40Nm 3 / h, the pressure is 0.016MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 349t / day, and the hydrogen consumption is 2640Nm 3 .

[0038] Comparative Example 1-2: Ordinary soda-lime-silica glass batch material was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 1, except that the first hydrogen energy combustion spray gun 31 was set inside the side burning spray gun 1 and extended outward by 45 cm from the side burning spray gun 1, and the hydrogen flow rate of the first hydrogen energy combustion spray gun 31 was 15 Nm 3 / h, pressure is 0.008MPa; fuel (natural gas) flow rate of side-burning spray gun is up to 80Nm 3 / h, the pressure is 0.016MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 388t / day, and the hydrogen consumption is 360Nm 3 .

[0039] Comparative Example 1-3: Ordinary soda-lime-silica glass batch is melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 1, except that the second hydrogen combustion spray gun 32 is located 10 cm above the side-burning spray gun 1 and extends into the glass furnace, with a distance of 26 cm from the plane of the inner wall of the breast wall, an angle of 10° with the horizontal direction, and a hydrogen flow rate of 60 Nm 3 / h, the pressure is 0.02MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 364t / day, and the hydrogen consumption is 1440Nm 3 .

[0040] Comparative Example 1-4: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 1, except that the second hydrogen combustion spray gun 32 was located 30 cm above the side-burning spray gun 1 and extended into the glass furnace, with a distance of 26 cm from the plane of the inner wall of the breast wall and an angle of 10° with the horizontal direction. The hydrogen flow rate of the second hydrogen combustion spray gun 32 was 20 Nm 3 / h, the pressure is 0.02MPa, and other conditions remain unchanged. The CO2 emissions from producing 600t of glass per day are 383t / day, and the hydrogen consumption is 480Nm 3 .

[0041] Comparative Example 1-5: Ordinary soda-lime-silica glass batch is melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 1, except that the second hydrogen combustion spray gun 32 is located 18 cm above the side-burning spray gun 1 and extends into the glass furnace, with a distance of 15 cm from the plane of the inner wall of the breast wall and an angle of 20° with the horizontal direction. The hydrogen flow rate of the second hydrogen combustion spray gun 32 is 40 Nm 3 / h, the pressure is 0.02MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 369t / day, and the hydrogen consumption is 960Nm 3 .

[0042] Comparative Example 1-6: Ordinary soda-lime-silica glass batch is melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 1, except that the second hydrogen combustion spray gun 32 is located 18 cm above the side-burning spray gun 1 and extends into the glass furnace, with a distance of 45 cm from the plane of the inner wall of the breast wall, an angle of 0° with the horizontal direction, and a hydrogen flow rate of 40 Nm 3 / h, the pressure is 0.02MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 370t / day, and the hydrogen consumption is 960Nm 3 .

[0043] Comparative Example 1-7: Ordinary soda-lime-silica glass batch is melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 1, except that the third hydrogen combustion spray gun 33 is located 25 cm below the side-burning spray gun 1 and extends into the glass furnace, and the distance from the plane of the inner wall of the breast wall is 45 cm. The hydrogen flow rate of the third hydrogen combustion spray gun 33 is 10 Nm 3 / h, the pressure is 0.006MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 395t / day, and the hydrogen consumption is 240Nm 3 .

[0044] Comparative Example 1-8: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 1, except that the third hydrogen combustion spray gun 33 was located 5 cm below the side-burning spray gun 1 and extended 10 cm outward from the nozzle brick. The hydrogen flow rate of the third hydrogen combustion spray gun 33 was 80 Nm 3 / h, the pressure is 0.006MPa, and other conditions remain unchanged. The CO2 emissions from producing 600t of glass per day are 355t / day, and the hydrogen consumption is 1920Nm 3 .

[0045] Comparative Example 1-9: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 1, except that the third hydrogen combustion spray gun 33 was located 10 cm below the side-burning spray gun 1 and extended 30 cm outward from the nozzle brick. The hydrogen flow rate of the third hydrogen combustion spray gun 33 was 40 Nm 3 / h, the pressure is 0.002MPa, the pressure of the second hydrogen combustion gun 32 is 0.01MPa, the pressure of the first hydrogen combustion gun 31 is 0.002MPa, and other conditions remain unchanged. The CO2 emission of 600t of glass per day is 367 tons / day, and the hydrogen consumption is 960Nm 3 .

[0046] Comparative Example 1-10: The ordinary soda-lime-silica glass batch is melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 1, except that the pressure of the first hydrogen combustion spray gun 31 is 0.02MPa, the pressure of the second hydrogen combustion spray gun 32 is 0.04MPa, the pressure of the third hydrogen combustion spray gun 33 is 0.01MPa, and the pressure of the natural gas in the side-burning spray gun is 0.016MPa. Other conditions remain unchanged. The CO2 emission is 341 tons / day and the hydrogen consumption is 2880Nm 3 .

[0047] Example 2

[0048] The combustion method provided in this embodiment uses a combustion spray gun system similar to that in embodiment 1, except that the following improvements are made: Figure 3 and 4 As shown:

[0049] 1. In the existing side-burning spray gun 1 (the natural gas flow rate in the side-burning spray gun is 50-170Nm 3 / h, pressure of 0.012-0.02MPa) is provided at the lower part thereof with a third hydrogen energy combustion spray gun 33 (which can be arranged horizontally or tilted downward so that the gun head faces the glass material liquid and the angle between the gun head and the horizontal direction is 3-8°, which can be as follows Figure 4The position is 8-15cm below the side-burning spray gun 1, and the gun head can extend into the glass furnace, and the distance from the plane where the inner wall of the breast wall is located can be 10-16cm. The flow rate of hydrogen is 50-180Nm 3 / h, the pressure is 0.004-0.008MPa, and the third hydrogen energy combustion spray gun 33 is closer to the glass liquid surface in the longitudinal direction, which is conducive to radiating the energy of flame combustion to the glass liquid and accelerating the radiation heat transfer of flame to the glass liquid. At the same time, a combustion medium spray gun 2 is added inside it, and the combustion medium spray guns 2 are equidistant and horizontally arranged (the axis of each combustion medium spray gun 2 can be at the same horizontal position or at a different horizontal position as the axis of the third hydrogen energy combustion spray gun 33) inside the third hydrogen energy combustion spray gun 33 and parallel to the third hydrogen energy combustion spray gun 33, and extend 5-10cm from the third hydrogen energy combustion spray gun 33 into the glass furnace. When in use, the combustion medium can be introduced into the air (flow rate 5-16Nm 3 / h, pressure 0.05-0.18MPa), oxygen can also be introduced (flow rate 2.5-10Nm 3 / h, pressure 0.1-0.25MPa), or no combustion medium may be introduced (flow rate = 0). When the combustion medium is introduced into the third hydrogen energy combustion spray gun 33, and the molar ratio of H2:O2 is less than 2:1, an oxidizing flame is generated, which is helpful for melting the glass. When only hydrogen (no combustion medium) or the molar ratio of H2:O2 is greater than 2:1 is introduced into the third hydrogen energy combustion spray gun 33, the hydrogen will absorb the combustion medium sprayed from the upper small furnace (side-burning spray gun), so that the local position covered by the flame of the third hydrogen energy combustion spray gun 33 forms a reducing flame, which is helpful for protecting the reducing agent in the glass batch and clarifying the glass liquid; that is, the present embodiment can choose whether to introduce the combustion medium according to different working conditions. When the glass liquid is in the melting zone of the melting pool, the combustion medium is introduced; when it is in the clarification zone, the combustion medium is not introduced, or when it is necessary to protect the reducing agent in the glass batch, the combustion medium may not be introduced.

[0050] 2. A fourth hydrogen energy combustion spray gun 34 is added to the pool wall below the third hydrogen energy combustion spray gun 33 (it can be arranged horizontally or tilted downward so that the gun head faces the glass material liquid and the angle with the horizontal direction is 3-8 degrees, as shown in the figure). Figure 4 As shown, it is in the shape of a long strip. The fourth hydrogen combustion lance 34 is located 30-45 cm below the existing side-burning lance 1. Its lance head can extend into the glass furnace. The distance from the plane where the inner wall of the breast wall is located can be 8-12 cm. The hydrogen flow rate is 20-30 Nm 3 / h, pressure 0.01-0.02MPa, a hole is opened at the lower part of the existing nozzle brick to further increase the flame situation between the flame and the glass liquid, further increase the heat transfer to the glass liquid, and reduce the viscosity of the glass liquid.

[0051] 3. A second hydrogen combustion spray gun 32 (which can be as shown in FIG. 1 ) with its head tilted downward is added to the upper part of the existing side-burning spray gun 1. Figure 4 As shown, it is in the shape of a long strip), and the flow rate of hydrogen is 90-150Nm 3 / h, the pressure is 0.015-0.025MPa, the second hydrogen combustion lance 32 is set 10-20cm above the side burning lance 1 and both are located at the same horizontal position (that is, there is no height difference in the vertical direction), the second hydrogen combustion lance 32 extends out of the nozzle brick into the kiln, and its gun head can extend into the glass kiln, the distance from the plane where the inner wall of the breast wall is located can be 6-10cm, and the angle with the horizontal direction is 5-15°; the angle of the second hydrogen combustion lance 32 is set and In combination with the distance between the side-burning spray guns 1, the flame of the lower side-burning spray gun 1 can be blocked to prevent the flame from drifting upward and burning the arch and breast wall; if the angle is too small, the effect of preventing the flame from drifting upward is limited; if the angle is too large, it will intersect with the flame generated by the lower side-burning spray gun, affecting the state, shape, and combustion conditions of the original flames, and affecting the radiation heat transfer to the glass; and if the angle is too large, the airflow generated by the flame will impact the surface of the glass liquid, disturb the glass liquid flow, and affect the clarification effect of the glass liquid.

[0052] Taking a 600t / d glass production line as an example, the combustion spray gun system of this embodiment is used to melt the ordinary soda-lime-silica glass batch to 1580°C, wherein the third hydrogen combustion spray gun 33 is located 10cm below the side combustion spray gun 1, and the flow rate of hydrogen is 100Nm 3 / h, the pressure is 0.006MPa. No combustion medium is introduced into the combustion medium spray gun 2. The fourth hydrogen combustion spray gun 34 is located 40cm below the existing side burning spray gun 1, and the hydrogen flow rate is 25Nm 3 / h, pressure 0.015MPa. The flow rate of hydrogen in the second hydrogen combustion spray gun 32 is 120Nm 3 / h, the pressure is 0.02MPa, the second hydrogen combustion lance 32 is located 15cm above the side burning lance 1, and the angle with the horizontal direction is 10°. The annual CO2 emission is 102,000-111,000 tons, and the hydrogen consumption is 2.1462 million Nm 3 ; The existing glass furnace combustion method and spray gun system (fueled by natural gas) emits 145,000 tons of CO2 per year.

[0053] Comparative Example 2-1: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 2, except that the fourth hydrogen energy combustion spray gun 34 was located 20 cm below the side burning spray gun 1, and the hydrogen flow rate was 40 Nm 3 / h, pressure 0.015MPa, other conditions remain unchanged, the CO2 emission of 600t glass per day is calculated to be 358t / day, and the hydrogen consumption is 1680Nm 3 / sky.

[0054] Comparative Example 2-2: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 2, except that the fourth hydrogen energy combustion spray gun 34 was located 55 cm below the side burning spray gun 1, and the hydrogen flow rate was 10 Nm 3 / h, pressure 0.015MPa, other conditions remain unchanged, the CO2 emission of 600t glass per day is 393t / day, and the hydrogen consumption is 240Nm 3 / sky.

[0055] Comparative Example 2-3: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 2, except that the second hydrogen combustion spray gun 32 was located 5 cm above the side-burning spray gun 1, with an angle of 0° to the horizontal direction, and the hydrogen flow rate of the second hydrogen combustion spray gun 32 was 180 Nm 3 / h, the pressure is 0.02MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 331t / day, and the hydrogen consumption is 4320Nm 3 / sky.

[0056] Comparative Example 2-4: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 2, except that the second hydrogen combustion spray gun 32 was located 30 cm above the side-burning spray gun 1, with an angle of 20° to the horizontal direction, and the hydrogen flow rate of the second hydrogen combustion spray gun 32 was 60 Nm 3 / h, the pressure is 0.02MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 363t / day, and the hydrogen consumption is 1440Nm 3 / sky.

[0057] Comparative Example 2-5: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 2, except that the third hydrogen energy combustion spray gun 33 was located 25 cm directly below the side burning spray gun 1, and the hydrogen flow rate of the third hydrogen energy combustion spray gun 33 was 30 Nm 3 / h, the pressure is 0.006MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 375t / day, and the hydrogen consumption is 720Nm 3 / sky.

[0058] Comparative Example 2-6: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 2, except that the third hydrogen energy combustion spray gun 33 was located 5 cm below the side burning spray gun 1, and the hydrogen flow rate of the third hydrogen energy combustion spray gun 33 was 210 Nm 3 / h, the pressure is 0.006MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day is 320t / day, and the hydrogen consumption is 5040Nm 3 / sky.

[0059] Comparative Example 2-7: The common soda-lime-silica glass batch is melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 2, except that the pressure of the third hydrogen energy combustion spray gun 33 is 0.002MPa, the pressure of the second hydrogen energy combustion spray gun 32 is 0.01MPa, and the pressure of the fourth hydrogen energy combustion spray gun 34 is 0.005MPa. Other conditions remain unchanged. The CO2 emission is calculated to be 315 tons / day and the hydrogen consumption is 5880Nm 3 / sky.

[0060] Example 3

[0061] The combustion method provided in this embodiment uses a combustion spray gun system similar to that of Embodiments 1 and 2, except that the following improvements are made: Figure 5 As shown:

[0062] 1. The side-burning spray guns 1 (the natural gas flow rate in the side-burning spray guns is 50-170Nm) are arranged on the side walls of the nozzle bricks of the existing glass kiln on both sides of each small furnace 5. 3 / h, pressure is 0.012-0.02MPa) and the number is usually two. Two third hydrogen energy combustion spray guns 33 are symmetrically distributed along the length direction of the kiln (i.e. the flow direction of the glass material liquid) at the oblique lower side of each side burning spray gun 1 (they can be arranged horizontally or tilted downward so that the gun head faces the glass material liquid and the angle with the horizontal direction is 3-8°, which can be as shown in the figure). Figure 5 As shown, it is in the shape of a long strip), so that the two third hydrogen energy combustion spray guns 33 and the side burning spray gun 1 form an isosceles triangle with the side burning spray gun 1 as the vertex; a side burning spray gun 1 is arranged on each side of the small furnace 5, so that a total of four third hydrogen energy combustion spray guns 33 are arranged, and the four third hydrogen energy combustion spray guns 33 are all on the same horizontal line, and the vertical distance between the horizontal line and the side burning spray gun 1 is 10-20cm, and the gun head can extend into the glass kiln, and the distance from the plane where the inner wall of the breast wall is located can be 10-16cm, and the hydrogen flow rate in the third hydrogen energy combustion spray gun 33 is 20-50Nm 3 / h, pressure 0.004-0.008MPa.

[0063] 2. As in Example 2, a second hydrogen combustion spray gun 32 (same as Example 2) with a downwardly inclined gun head is added to the upper part of the existing side-burning spray gun 1. Figure 4 , as Figure 5 As shown, it is in the shape of a long strip), and the flow rate of hydrogen is 90-150Nm 3 / h, the pressure is 0.015-0.025MPa, the second hydrogen combustion spray gun 32 is arranged 10-20cm above the side burning spray gun 1 and they are both located at the same horizontal position (that is, there is no height difference in the vertical direction); the second hydrogen combustion spray gun 32 extends out of the nozzle brick into the kiln, the extended length is 20-36cm from the plane where the breast wall is located, and the angle with the horizontal direction is 5-15°, the angle of the second hydrogen combustion spray gun 32 and the distance between the second hydrogen combustion spray gun 32 and the side burning spray gun 1 are matched, so as to block the flame of the lower side burning spray gun 1 and prevent the flame from drifting upward and burning the large arch and the breast wall; if the angle is too small, the effect of preventing the flame from drifting upward is limited; if the angle is too large, it will cross with the flame generated by the lower side burning spray gun, affecting the state, shape and combustion of the original flames, and affecting the radiation heat transfer to the glass; and if the angle is too large, the airflow generated by the flame will impact the surface of the glass material liquid, disturb the glass material liquid flow, and affect the clarification effect of the glass material liquid.

[0064] 3. In the existing glass kiln, each small furnace 5 is provided with a side-burning spray gun 1 on both sides, so there are two adjacent side-burning spray guns 1 between the two small furnaces (see Figure 5 A fifth hydrogen combustion spray gun 35 (which can be arranged horizontally or tilted downward so that the gun head faces the glass liquid and the angle with the horizontal direction is 3-8°) is added between two adjacent side-burning spray guns 1, and is arranged in multiple rows and columns ( Figure 5 4 rows and 2 columns are shown), each row is 15-25cm apart, the gun head can extend into the glass furnace, the distance from the plane where the inner wall of the breast wall is located can be 5-8cm, and the hydrogen flow rate is 130-220Nm 3 / h, pressure 0.05-0.1MPa. At the same time, a combustion-supporting medium spray gun 2 (same as Example 1) is added at the gun core position. The combustion-supporting medium spray gun 2 is mounted inside the fifth hydrogen combustion spray gun 35 (coaxial or non-coaxial). Its main function is to increase the flame length and help increase the coverage area of ​​the flame. Adding a hydrogen combustion flame at a position where there is no flame between the two pairs of small furnaces can improve the uniformity of the glass material liquid and improve the glass melting speed and quality. The combustion-supporting medium spray gun 2 is a high-pressure gas spray gun with a pressure of generally 0.3-0.7MPa. The combustion-supporting medium can be air (dosage 5-16Nm 3 / h), or oxygen (dosage 2.5-10Nm 3 / h), high-pressure nitrogen can also be introduced into the combustion medium spray gun to increase the flame rigidity and lengthen the flame. The nitrogen flow rate is 2-7Nm 3 / h.

[0065] Taking a 600t / d glass production line as an example, the combustion spray gun system of this embodiment is used to melt the ordinary soda-lime-silica glass batch to 1580°C, wherein the vertical distance between the third hydrogen energy combustion spray gun 33 and the side burning spray gun 1 in the vertical direction is 15cm, and the hydrogen flow rate in the third hydrogen energy combustion spray gun 33 is 35Nm 3 / h, pressure 0.004-0.008MPa. The flow rate of hydrogen in the second hydrogen combustion spray gun 32 is 120Nm 3 / h, the pressure is 0.02MPa, the second hydrogen combustion lance 32 is located 15cm above the side burning lance 1 and extends 28cm out of the nozzle brick, with an angle of 10° to the horizontal direction. The fifth hydrogen combustion lance 35 is arranged in two rows, with a spacing of 20cm between the two rows, and a hydrogen flow rate of 170Nm 3 / h, pressure 0.08MPa. No combustion medium or nitrogen is introduced into the combustion medium spray gun 2. The annual CO2 emission is 95,000-103,000 tons, and the annual hydrogen consumption is 2.847 million Nm 3 ; The existing glass furnace combustion method and spray gun system (fueled by natural gas) emits 145,000 tons of CO2 per year.

[0066] Comparative Example 3-1: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 3, except that the vertical distance between the third hydrogen combustion spray gun 33 and the side burning spray gun 1 in the vertical direction was 5 cm, and the hydrogen flow rate was 60 Nm 3 / h, pressure 0.002MPa, other conditions remain unchanged, the CO2 emission of 600t glass per day is calculated to be 360.5t / day, and the hydrogen consumption is 1440Nm 3 / sky.

[0067] Comparative Example 3-2: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 3, except that the vertical distance between the third hydrogen combustion spray gun 33 and the side burning spray gun 1 in the vertical direction was 30 cm, and the hydrogen flow rate was 10 Nm 3 / h, pressure 0.01MPa, other conditions remain unchanged, the CO2 emission of 600t glass per day is calculated to be 390t / day, and the hydrogen consumption is 240Nm 3 / sky.

[0068] Comparative Example 3-3: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 3, except that the second hydrogen combustion spray gun 32 was located 5 cm above the side-burning spray gun 1 and extended 45 cm outward from the nozzle brick, with an angle of 0° to the horizontal direction, and the hydrogen flow rate of the second hydrogen combustion spray gun 32 was 180 Nm 3 / h, the pressure is 0.02MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 329t / day, and the hydrogen consumption is 4320Nm 3 / sky.

[0069] Comparative Example 3-4: Ordinary soda-lime-silica glass batch was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 3, except that the second hydrogen combustion spray gun 32 was located 30 cm above the side-burning spray gun 1 and extended 15 cm outward from the nozzle brick, with an angle of 20° with the horizontal direction, and the hydrogen flow rate of the second hydrogen combustion spray gun 32 was 60 Nm 3 / h, the pressure is 0.02MPa, and other conditions remain unchanged. The CO2 emissions for producing 600t of glass per day are 358t / day, and the hydrogen consumption is 1440Nm 3 / sky.

[0070] Comparative Example 3-5: The common soda-lime-silica glass batch is melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 3, except that the pressure of the third hydrogen energy combustion spray gun 33 is 0.002MPa, the pressure of the second hydrogen energy combustion spray gun 32 is 0.01MPa, and the pressure of the fifth hydrogen energy combustion spray gun 35 is 0.08MPa. Other conditions remain unchanged. The CO2 emission is calculated to be 303 tons / day and the hydrogen consumption is 7800Nm 3 / sky.

[0071] Comparative Example 3-6: The common soda-lime-silica glass batch is melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 3, except that the pressure of the third hydrogen energy combustion spray gun 33 is 0.02MPa, the pressure of the second hydrogen energy combustion spray gun 32 is 0.04MPa, and the pressure of the fifth hydrogen energy combustion spray gun 35 is 0.08MPa. Other conditions remain unchanged. The CO2 emission is 293 tons / day and the hydrogen consumption is 7800Nm 3 / sky.

[0072] Comparative Example 3-7: Ordinary soda-lime-silica glass batch is melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 3, except that the fifth hydrogen energy combustion spray gun 35 is arranged in two rows, the interval between the two rows is 10 cm, and the hydrogen flow rate is 100 Nm 3 / h, pressure 0.08MPa, other conditions remain unchanged, the CO2 emission of 600t glass per day is calculated to be 346t / day, and the hydrogen consumption is 2400Nm 3 / sky.

[0073] Comparative Example 3-8: Ordinary soda-lime-silica glass batch material was melted to 1580°C using the combustion method and the parameters of the spray gun system of Example 3, except that the fifth hydrogen energy combustion spray gun 35 was arranged in two rows with a spacing of 30 cm between the two rows and a hydrogen flow rate of 250 Nm 3 / h, pressure 0.08MPa, other conditions remain unchanged, the CO2 emission of 600t glass per day is calculated to be 312t / day, and the hydrogen consumption is 6000Nm 3 / sky.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the contents of the present invention.

Claims

1. A combustion method for a glass furnace, wherein a side-burning spray gun is used on the side wall of a nozzle brick of the glass furnace to heat and clarify a glass batch material in a melting pool of the glass furnace, and the fuel in the side-burning spray gun is selected from fossil fuels, characterized in that: The second hydrogen combustion spray gun and the third hydrogen combustion spray gun respectively installed above and below the side burning spray gun are used to heat and clarify the glass batch in the glass furnace melting pool. The fuel in the hydrogen combustion spray gun is hydrogen. The flow rate of the fossil fuel in the side burning spray gun is 50-170 Nm 3 / h, pressure is 0.012-0.02MPa; The second hydrogen combustion spray gun is located 15-20 cm above the side burning spray gun, and its gun head extends into the glass furnace toward the glass liquid. The angle between the second hydrogen combustion spray gun and the horizontal direction is 5-15°, and the distance between the gun head and the plane where the inner wall of the breast wall of the glass furnace is located is 20-36 cm. The flow rate of hydrogen is 30-50 Nm 3 / h, pressure is 0.015-0.025MPa; The third hydrogen combustion spray gun is located 10-15 cm below the side burning spray gun, and its gun head extends into the glass furnace, and the distance from the plane of the inner wall of the breast wall is 20-35 cm. The flow rate of hydrogen is 20-65 Nm 3 / h, pressure is 0.004-0.008MPa; The first hydrogen energy combustion spray gun installed inside the side burning spray gun is used to heat and clarify the glass batch in the glass furnace molten pool, and the gun head of the first hydrogen energy combustion spray gun extends 15-35cm from the side burning spray gun to the inside of the glass furnace. The fuel in the first hydrogen energy combustion spray gun is hydrogen, and the flow rate of hydrogen is 20-60Nm 3 / h, the pressure is 0.005-0.01MPa, and the flame sprayed by the first hydrogen combustion spray gun is shorter than the flame sprayed by the side burning spray gun.

2. The combustion method according to claim 1, characterized in that: The third hydrogen energy combustion spray gun is equipped with a combustion-supporting medium spray gun, and the gun head of the combustion-supporting medium spray gun extends 6-11 cm from the third hydrogen energy combustion spray gun to the inside of the glass furnace.

3. The combustion method according to claim 2, characterized in that: When the combustion medium is air, the air flow rate is 5-16Nm 3 / h, pressure 0.05-0.18MPa; when the combustion medium is oxygen, the flow rate is 2.5-10 Nm 3 / h, pressure 0.1-0.25MPa; or close the combustion medium spray gun.

4. The combustion method according to any one of claims 1 to 3, characterized in that: A fourth hydrogen combustion spray gun is provided 30-45 cm below the side-burning spray gun, and its gun head extends into the glass furnace, and the distance from the plane where the inner wall of the breast wall is located is 8-12 cm. The fourth hydrogen combustion spray gun is used to heat and clarify the glass batch in the glass furnace molten pool, wherein the fuel is hydrogen, and the flow rate of hydrogen is 20-30 Nm 3 / h.

5. The combustion method according to any one of claims 1 to 3, characterized in that: One or more fifth hydrogen combustion spray guns are arranged between two adjacent side-burning spray guns in the furnace, and the distance between the gun head and the plane where the inner wall of the breast wall is located is 5-8 cm. The fifth hydrogen combustion spray gun is used to heat and clarify the glass batch in the melting pool of the glass furnace. The fuel of the fifth hydrogen combustion spray gun is hydrogen, and the flow rate of hydrogen is 130-220Nm 3 / h.

6. The combustion method according to claim 5, characterized in that: A combustion-supporting medium spray gun is installed inside the fifth hydrogen combustion spray gun, and high-pressure gas is introduced into the combustion-supporting medium spray gun, and the pressure is 0.3-0.7MPa.

7. The combustion method according to claim 6, characterized in that: The high-pressure gas is high-pressure air, and the high-pressure air flow rate is 5-16 Nm 3 / h; or the high-pressure gas is high-pressure oxygen, and the high-pressure oxygen flow rate is 2.5-10 Nm 3 / h; or the high-pressure gas is high-pressure nitrogen, and the high-pressure nitrogen flow rate is 2-7 Nm 3 / h.

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