Glass hydrogen-doped combustion device

Abstract

The present invention relates to the technical field of float glass manufacturing equipment, and specifically to a glass hydrogen-doped combustion device, comprising: an all-oxygen combustion lance, which is suitable for combustion using a fuel with a hydrogen volume ratio of 60%-70%; a heat storage combustion zone, which is installed downstream of the all-oxygen combustion lance, and in which a plurality of groups of oxygen combustion lances are sequentially installed, and the oxygen combustion lances are suitable for combustion using a fuel with a hydrogen volume ratio of no more than 60%. Fuel storage equipment is required in the heat storage combustion zone, so a fuel with a lower hydrogen ratio is used to prevent hydrogen from causing hydrogen embrittlement defects in the equipment in the glass hydrogen-doped combustion device. The glass hydrogen-doped combustion device uses a fuel doped with hydrogen as a combustion material, and combines the optimized design of the all-oxygen combustion lance and the oxygen combustion lance, thereby reducing carbon dioxide emissions without replacing more expensive hydrogen storage equipment, thereby reducing the production cost of producing hydrogen as a glass combustion fuel.

Description

Technical Field

[0001] The invention relates to the technical field of float glass manufacturing equipment, and in particular to a glass hydrogen-doped combustion device. Background Art

[0002] Flat glass production produces significant amounts of carbon dioxide (CO2). The combustion of fossil fuels during production accounts for 60% of CO2 emissions, making it the largest contributor to total CO2 emissions. Reducing CO2 emissions during flat glass production is a future trend, and replacing fossil fuels with green fuels is imperative to effectively reduce carbon emissions.

[0003] Hydrogen is a green, clean energy source with a high calorific value, making it a suitable alternative to fossil fuels. However, its flame propagates rapidly, creating a significant explosion and making combustion control more difficult. Hydrogen's explosive limits range from 4.0% to 75.6%, and its rapid escape and diffusion rate. Leakage in confined spaces or the mixing of air into hydrogen storage can easily ignite and explode. Hydrogen's chemical properties are too reactive. While natural gas can be stored in standard metal tanks, hydrogen directly penetrates metal, causing hydrogen embrittlement. Therefore, storage requires the use of modified, multi-layer hydrogen storage bottles manufactured using a specialized composite material process. Due to the characteristics of hydrogen's active chemical properties, high safety requirements for use, and weak combustion flame radiation, when replacing fossil fuels in float glass production furnaces with hydrogen, not only does it require replacing most equipment in the melting cellar, such as the heat storage chamber and fuel pipelines, but the spatial dimensions and operating parameters inside the melting furnace also need to be significantly revised, which will greatly increase the production cost of the glass and make it difficult to implement the plan of using hydrogen as fuel to melt and burn glass. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of high cost in the prior art of using hydrogen as fuel to melt and burn glass, thereby providing a glass hydrogen-doped combustion device.

[0005] In order to solve the above technical problems, the present invention provides a glass hydrogen-doped combustion device, comprising:

[0006] Oxygen combustion spray gun, which is suitable for burning fuel with a hydrogen volume ratio of 60%-70%;

[0007] The regenerative combustion zone is installed downstream of the oxy-fuel combustion lance. Multiple groups of oxygen combustion lances are sequentially installed in the regenerative combustion zone. The oxygen combustion lances are suitable for burning fuel with a hydrogen volume ratio of no more than 60%.

[0008] Optionally, the regenerative combustion zone includes:

[0009] The glazing combustion section has an oxygen combustion lance installed therein suitable for combustion with a hydrogen volume ratio of 30% to 60% fuel;

[0010] The melting combustion section is located downstream of the glazing combustion section. The oxygen combustion lance installed inside the melting combustion section is suitable for burning fuel with a hydrogen volume ratio of 0%.

[0011] The clarifying combustion section is arranged downstream of the melting combustion section. The oxygen combustion lance installed inside the clarifying combustion section is suitable for burning fuel with a hydrogen volume ratio of no more than 10%.

[0012] Optionally, the glazing combustion section is equipped with at least three groups of oxygen combustion lances. In the glazing combustion section, the upstream oxygen combustion lances are suitable for using a fuel with a greater volume ratio of hydrogen than the downstream oxygen combustion lances.

[0013] Optionally, the glazing combustion section is equipped with three groups of oxygen combustion spray guns, the group of oxygen combustion spray guns located upstream is suitable for burning fuel with a hydrogen volume ratio of 45%-60%, the group of oxygen combustion spray guns located midstream is suitable for burning fuel with a hydrogen volume ratio of 35%-45%, and the group of oxygen combustion spray guns located downstream is suitable for burning fuel with a hydrogen volume ratio of 30%-35%.

[0014] Optionally, the clarification combustion section is equipped with at least two groups of oxygen combustion lances, and in the glazing combustion section, the volume ratio of hydrogen in the fuel suitable for the upstream oxygen combustion lance is smaller than that of the downstream oxygen combustion lance.

[0015] Optionally, the clarification combustion section is equipped with two groups of oxygen combustion lances, the upstream group of oxygen combustion lances is suitable for burning fuel with a hydrogen volume ratio of no more than 5%, and the downstream group of oxygen combustion lances is suitable for burning fuel with a hydrogen volume ratio of 5%-10%.

[0016] Optionally, three groups of oxygen combustion lances are installed in the melting and combustion section.

[0017] Optionally, a regenerative chamber is installed in the regenerative combustion zone, and the oxygen combustion lance is connected to the regenerative chamber via a small furnace.

[0018] Optionally, a feeding port is provided upstream of the oxy-fuel combustion lance.

[0019] Optionally, each group of oxygen combustion lances includes at least a pair of oxygen lance bodies arranged facing each other.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. The glass hydrogen-doped combustion device provided by the present invention comprises: an oxyfuel combustion lance suitable for combustion using a fuel containing 60% to 70% hydrogen by volume; a regenerative combustion zone installed downstream of the oxyfuel combustion lance, wherein multiple groups of oxyfuel combustion lances are sequentially installed within the regenerative combustion zone, each of the oxyfuel combustion lances being suitable for combustion using a fuel containing no more than 60% hydrogen by volume.

[0022] The oxyfuel burner utilizes fuel blended with 60%-70% hydrogen, ensuring complete combustion while maintaining high thermal efficiency and ensuring sufficient melting of the glass powder. The regenerative combustion zone utilizes fuel with a hydrogen content of no more than 60% by volume. This maintains high combustion efficiency even at lower hydrogen concentrations, allowing the glass to gradually melt and clarify. The oxyfuel burner area within the device eliminates the need for fuel storage or pre-combustion, eliminating the need to consider hydrogen embrittlement of equipment. Fuel storage is required in the regenerative combustion area, so fuel with a lower hydrogen content is used to prevent hydrogen embrittlement of equipment within the hydrogen-infused glass burner. By using hydrogen-infused fuel as the combustion medium and combining optimized designs for both the oxyfuel and oxygen burner lances, the hydrogen-infused glass burner reduces carbon dioxide emissions while eliminating the need for expensive hydrogen storage equipment. This significantly reduces the production cost of hydrogen as a fuel for glass combustion, significantly contributing to the green and sustainable development of the glass manufacturing industry.

[0023] 2. The glass hydrogen-doped combustion device provided by the present invention has at least three groups of oxygen combustion spray guns installed in the glazing combustion section. In the glazing combustion section, the volume ratio of hydrogen in the fuel suitable for the upstream oxygen combustion spray gun is greater than the volume ratio of hydrogen in the fuel suitable for the downstream oxygen combustion spray gun. The main flue gas products produced by the spray gun are carbon dioxide and water, and the water content increases with the increase of hydrogen content. The water in the flue gas will adhere to the unmelted glass powder, which can reduce the viscosity of the glass powder surface and accelerate the melting of the glass powder. By setting the fuel of the oxygen combustion spray gun in the glazing combustion section to a fuel with a gradually decreasing hydrogen volume, the melting speed slows down as the glass powder moves forward, which can prevent the volatilization of the upper layer of glass powder and avoid the volatilized glass powder from clogging the heat storage combustion zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic structural diagram of a glass hydrogen-doped combustion device provided in an embodiment of the present invention.

[0026] Explanation of the accompanying symbols: 1. All-oxygen combustion lance; 2. Regenerative combustion zone; 3. Glazing combustion section; 4. Melting combustion section; 5. Clarifying combustion section; 6. Oxygen combustion lance; 7. Regenerative chamber; 8. Small furnace; 9. Feeding port. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Figure 1 The figure shows a glass hydrogen-doped combustion device provided in this embodiment, comprising an oxygen combustion lance 1 and a heat storage combustion zone 2. Figure 1The arrows in the figure indicate the direction of travel of the glass powder in the glass melting and combustion apparatus. The glass melting and combustion apparatus in this embodiment is a float glass furnace, using natural gas as the primary fuel, i.e., natural gas mixed with hydrogen. In other embodiments, the glass melting and combustion apparatus may also be other devices for melting glass powder.

[0032] The oxyfuel lance 1 is suitable for combustion using a fuel containing 60% to 70% hydrogen by volume. A regenerative combustion zone 2 is installed downstream of the oxyfuel lance 1. Multiple groups of oxygen lances 6 are sequentially installed within this zone. These lances are suitable for combustion using a fuel containing no more than 60% hydrogen by volume. A feed port 9 is located upstream of the oxyfuel lance 1 for feeding glass powder into the melting furnace.

[0033] The regenerative combustion zone 2 includes a glazing combustion section 3, a melting combustion section 4, and a clarification combustion section 5. The oxygen combustion lances 6 installed within the glazing combustion section 3 are suitable for combustion using fuels with a hydrogen volume ratio of 30% to 60%. The melting combustion section 4 is located downstream of the glazing combustion section 3 and contains three sets of oxygen combustion lances 6. The oxygen combustion lances 6 installed within the melting combustion section 4 are suitable for combustion using fuels with a hydrogen volume ratio of 0%. The clarification combustion section 5 is located downstream of the melting combustion section 4 and contains oxygen combustion lances 6 installed within the clarification combustion section 5.

[0034] The glazing combustion section 3 is equipped with at least three groups of oxygen combustion lances 6. Within the glazing combustion section 3, the upstream oxygen combustion lances 6 are suitable for using a fuel with a hydrogen volume ratio greater than the downstream oxygen combustion lances 6. In this embodiment, the glazing combustion section 3 is equipped with three groups of oxygen combustion lances 6. The upstream group of oxygen combustion lances 6 is suitable for using a fuel with a hydrogen volume ratio of 45% to 60%, the midstream group of oxygen combustion lances 6 is suitable for using a fuel with a hydrogen volume ratio of 35% to 45%, and the downstream group of oxygen combustion lances 6 is suitable for using a fuel with a hydrogen volume ratio of 30% to 35%.

[0035] The clarification combustion section 5 is equipped with at least two sets of oxygen combustion lances 6. Within the glazing combustion section 3, the upstream oxygen combustion lances 6 are suitable for using a fuel with a lower hydrogen volume ratio than the downstream oxygen combustion lances 6. In this embodiment, the clarification combustion section 5 is equipped with two sets of oxygen combustion lances 6. The upstream set of oxygen combustion lances 6 is suitable for burning fuel with a hydrogen volume ratio of no more than 5%, and the downstream set of oxygen combustion lances 6 is suitable for burning fuel with a hydrogen volume ratio of 5% to 10%.

[0036] A regenerator 7 is also installed within the regenerative combustion zone 2. The oxygen combustion lances 6 are connected to the regenerator 7 via a small furnace 8. The regenerator 7 is filled with different fuels, and each regenerator 7 is connected to a group of oxygen combustion lances 6 via a small furnace 8. The methane in the mixed fuel is cracked and reformed under the high temperature conditions within the regenerator. After reforming, the total carbon content remains unchanged, but carbon accumulation increases the flame's radiant intensity, while increasing hydrogen content and reducing combustion energy consumption. In this embodiment, each group of oxygen combustion lances 6 includes three pairs of oxygen lance bodies positioned opposite each other.

[0037] Using the principle of gradient hydrogen doping, taking a daily melting capacity of 800-1000 tons of flat glass as an example, a total of 60%-70% hydrogen is added to the No. 0 oxyfuel lance 1. The hydrogen content in the fuel used by the corresponding oxygen-fuel lances 6 in small furnaces 8 is increased by more than 30%. The fuel used by the oxygen-fuel lances 6 in small furnaces 8 from 4 to 6 is not doped with hydrogen. The hydrogen content in the fuel used by the oxygen-fuel lances 6 in small furnaces 8 from 7 to 8 is controlled to be less than 10%. In other embodiments, if additional small furnaces 8 are subsequently added, the hydrogen content in the fuel used by the corresponding oxygen-fuel lances 6 in the subsequent small furnaces 8 is controlled to be less than 10%. Specifically, the hydrogen content in the fuel used by the oxygen combustion lance 6 corresponding to the first small furnace 8 is increased by 50%, the hydrogen content in the fuel used by the oxygen combustion lance 6 corresponding to the second small furnace 8 is increased by 40%, the hydrogen content in the fuel used by the oxygen combustion lance 6 corresponding to the third small furnace 8 is increased by 30%, the hydrogen content in the fuel used by the oxygen combustion lance 6 corresponding to the seventh small furnace 8 is increased by 5%, and the hydrogen content in the fuel used by the oxygen combustion lance 6 corresponding to the eighth small furnace 8 is increased by 10%. The above proportions are all calculated by volume.

[0038] A high proportion of hydrogen is added to the No. 0 oxyfuel lance 1 and small furnaces 8, enabling rapid glazing of the glass. The primary flue gas products produced by the lances are carbon dioxide and water, and the water content in the flue gas increases with the hydrogen content of the fuel. This water adheres to the unmelted glass powder, reducing its surface viscosity and accelerating melting. By setting the fuel for the oxygen lance 6 in the glazing combustion section 3 to a fuel with a gradually decreasing hydrogen volume, the melting rate slows as the glass powder advances, preventing volatilization of the upper layer of glass powder and clogging the heat storage combustion zone 2 with volatilized glass powder. Small furnaces 8, 4 through 6, use natural gas without hydrogen as fuel, resulting in high combustion temperatures and relatively low water vapor content in the flue gas, which facilitates glass clarification and homogenization, accelerating glass melting. Small furnaces 8, 7 and 8, contain relatively small amounts of hydrogen to adjust the homogenization temperature and glass forming parameters, achieving a non-combustion process that reduces carbon dioxide emissions during combustion.

[0039] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A glass hydrogen-doped combustion device, characterized in that: include: An oxyfuel combustion lance (1) suitable for combustion using a fuel having a hydrogen volume ratio of 60% to 70%; A regenerative combustion zone (2) is installed downstream of the oxyfuel combustion lance (1), wherein a plurality of oxygen combustion lances (6) are sequentially installed in the regenerative combustion zone (2), and the oxygen combustion lances (6) are suitable for combustion using a fuel having a hydrogen volume ratio of no more than 60%; The heat storage combustion zone (2) comprises: The glazing combustion section (3) has an oxygen combustion lance (6) installed therein suitable for burning fuel having a hydrogen volume ratio of 30% to 60%; A melting combustion section (4) is provided downstream of the glazing combustion section (3), wherein the oxygen combustion lance (6) installed inside the melting combustion section (4) is suitable for combustion using a fuel having a hydrogen volume ratio of 0%; The clarifying combustion section (5) is arranged downstream of the melting combustion section (4), and the oxygen combustion lance (6) installed inside the clarifying combustion section (5) is suitable for combustion using a fuel with a hydrogen volume ratio of no more than 10%.

2. The glass hydrogen-doped combustion device according to claim 1, characterized in that: The glazing combustion section (3) is equipped with at least three groups of oxygen combustion lances (6). In the glazing combustion section (3), the volume ratio of hydrogen in the fuel suitable for the upstream oxygen combustion lances (6) is greater than the volume ratio of hydrogen in the fuel suitable for the downstream oxygen combustion lances (6).

3. The glass hydrogen-doped combustion device according to claim 2, characterized in that: The glazing combustion section (3) is equipped with three groups of oxygen combustion lances (6), wherein the group of oxygen combustion lances (6) located upstream is suitable for burning fuel with a hydrogen volume ratio of 45%-60%, the group of oxygen combustion lances (6) located midstream is suitable for burning fuel with a hydrogen volume ratio of 35%-45%, and the group of oxygen combustion lances (6) located downstream is suitable for burning fuel with a hydrogen volume ratio of 30%-35%.

4. The glass hydrogen-doped combustion device according to claim 1, characterized in that: The clarified combustion section (5) is equipped with at least two groups of oxygen combustion lances (6). In the clarified combustion section (5), the volume ratio of hydrogen in the fuel suitable for the upstream oxygen combustion lances (6) is smaller than the volume ratio of hydrogen in the fuel suitable for the downstream oxygen combustion lances (6).

5. The glass hydrogen-doped combustion device according to claim 4, characterized in that: The clarification combustion section (5) is equipped with two groups of oxygen combustion lances (6), wherein the group of oxygen combustion lances (6) located upstream is suitable for burning fuel with a hydrogen volume ratio of no more than 5%, and the group of oxygen combustion lances (6) located downstream is suitable for burning fuel with a hydrogen volume ratio of 5%-10%.

6. The glass hydrogen-doped combustion device according to claim 5, characterized in that: Three groups of oxygen combustion lances (6) are installed in the melting and combustion section (4).

7. The glass hydrogen-doped combustion device according to any one of claims 1 to 6, characterized in that: A regenerative chamber (7) is also installed in the regenerative combustion zone (2), and the oxygen combustion lance (6) and the regenerative chamber (7) are connected via a small furnace (8).

8. The glass hydrogen-doped combustion device according to any one of claims 1 to 6, characterized in that: A feeding port (9) is provided upstream of the oxy-combustion lance (1).

9. The glass hydrogen-doped combustion device according to any one of claims 1 to 6, characterized in that: Each group of oxygen combustion lances (6) comprises at least a pair of oxygen lance bodies arranged facing each other.

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