Mixing method of glass melting furnace fuel

Abstract

The invention discloses a mixing method of fuel of a glass melting furnace. The gas mixing device used in the method can uniformly mix two gases with different pressures under the condition of not using a pressure increasing or reducing device. The gas mixing device is simple in structure, convenient and fast to install and low in transformation, installation and maintenance cost.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid mixing methods, and in particular relates to a mixing method for glass melting furnace fuel. Background Art

[0002] A glass melting furnace is a thermal process used in the glass manufacturing industry to mix all glass raw materials (i.e., batch material and cullet) and then process them through high-temperature melting and clarification processes to produce a uniform, moldable glass liquid. Existing glass melting furnaces typically use gaseous fuels such as natural gas, producer gas, and coke oven gas to heat, melt, and clarify the raw materials. The combustion of these fuels produces large amounts of the greenhouse gas CO2, which contributes to global warming. To reduce CO2 emissions from combustion exhaust, one measure is to blend other low-carbon gaseous fuels (such as hydrogen and ammonia) into the above-mentioned fuels to reduce the total carbon content.

[0003] However, the different pressures of different gases make it difficult to mix two or more gas fuels evenly when mixing, which in turn reduces the uniformity of the flame during combustion, resulting in low melting efficiency of the gas fuel for the raw materials, and even the risk of burning the melting furnace. In addition, when low-pressure gas is mixed into high-pressure gas, the low-pressure gas is easily blocked by the high-pressure gas, and even the high-pressure gas flows back into the low-pressure gas pipeline due to the pressure difference, polluting the low-pressure gas source. The current common solution is to use a booster to increase the pressure of the low-pressure gas or reduce the pressure of the high-pressure gas. Adding a booster requires a lot of cost (especially the power consumption of the compressor), and it also increases the complexity and cost of maintenance. Reducing the pressure of the high-pressure gas can easily lead to a reduction in the flow rate of the mixed fuel gas and / or a shortening of the flame length of the combustion lance, reducing the flame coverage area, reducing the melting efficiency of the melting furnace, and even making it difficult to ensure the normal melting capacity (i.e., production volume) of the melting furnace. Summary of the Invention

[0004] The purpose of the present invention is to address the technical defects existing in the prior art and provide a glass melting furnace fuel mixing method that can improve the uniformity of mixing of several gases. The glass melting furnace fuel mixing method comprises adding a gas mixing device to a fuel delivery pipeline at a position as close as possible to a fuel spray gun, the gas mixing device comprising a gas mixing pipeline (1) and a second gas inlet pipeline (2); wherein,

[0005] The gas mixing pipeline (1) comprises an inlet end connected to the first gas supply device (6), an outlet end connected to the gas using device (8), and a hollow tube body located between the inlet end and the outlet end;

[0006] The second gas inlet pipeline (2) comprises an inlet end connected in sequence to the second gas supply device (7), a pipeline body extending from the outside of the gas mixing pipeline (1) through the side wall of the gas mixing pipeline (1) to the inside of the hollow tube body thereof, and an outlet end located in the hollow tube body of the gas mixing pipeline (1) and facing the inlet end of the gas mixing pipeline (1). A second gas outlet hole (4) for connecting the second gas inlet pipeline (2) with the gas mixing pipeline (1) is provided on the side wall of the pipeline body located near the outlet end of the second gas inlet pipeline (2);

[0007] The end of the outlet end of the second gas inlet pipeline (2) is connected to a gas blocking component (3) having a curved three-dimensional structure. One end of the gas blocking component (3) is sealed and connected to the outlet end of the second gas inlet pipeline (2) and serves as a connecting end. The gas blocking component (3) extends along the outlet end of the second gas inlet pipeline (2) toward the inlet end of the mixing gas pipeline (1). The other end thereof close to the inlet end of the mixing gas pipeline (1) is a closed end. The curved three-dimensional structure is a structure that enables a first gas having a higher pressure than that of a second gas to form a negative pressure area near the second outlet hole (4) when flowing through the second gas outlet hole (4); preferably, the negative pressure area enables the second gas to be fully discharged into the mixing gas pipeline (1).

[0008] The curved three-dimensional structure is a body of revolution, and the axis of the body of revolution overlaps with the central axis of the gas mixing pipe (1).

[0009] Any cross section of the rotating body perpendicular to the axis except the closed end is circular.

[0010] The area of ​​the closed end of the gas blocking component (3) is smaller than the area of ​​the connecting end.

[0011] The ratio of the diameter of the connection end of the gas blocking component (3) to the inner diameter of the gas mixing pipe (1) is 0.45 to 0.7.

[0012] The ratio of the diameter of the second gas inlet pipeline (2) to the diameter of the connecting end of the gas blocking component (3) is 0.5 to 0.8.

[0013] The gas blocking component (3) is a rotating body in the shape of a cone, a hemisphere, a semi-ellipsoid, a truncated cone, a trumpet, or the like.

[0014] The length of the gas blocking component (3) along the central axis of the gas mixing pipe (1) is 0.2-1 of the diameter of the connecting end of the gas blocking component (3). Optionally, the diameter ratio of the closed end to the connecting end is ≤0.7.

[0015] A plurality of baffles (9) are provided on the inner wall of the gas outlet end of the gas mixing pipe (1), facing the central axis of the gas mixing pipe (1) and inclined in the gas outflow direction, and the angle between the baffles (9) and the radial direction of the gas mixing pipe (1) is 20°-60°; one end of each baffle (9) is provided on the inner wall of the gas mixing pipe (1), and the other end extends toward the axis of the gas mixing pipe (1); the length L of the baffle (9) extending in the gas mixing pipe (1) is 0.4-0.6 of the diameter of the gas mixing pipe (1);

[0016] Preferably, the baffles (9) can be distributed in one or more layers along the axial direction of the gas mixing pipe (1), and the layer of baffles (9) closest to the gas inlet end of the gas mixing pipe (1) is located at the rear side of the second gas inlet pipeline (2);

[0017] Optionally, the baffles (9) may also be distributed at intervals and in a staggered manner along the inner wall of the gas mixing pipe (1).

[0018] The first gas enters through the gas inlet end of the gas mixing pipeline (1), and the second gas enters through the gas inlet end of the second gas inlet pipeline (2); in the process of the first gas moving toward the gas outlet end of the gas mixing pipeline (1), under the blocking action of the gas blocking component (3), a negative pressure area is formed near the position of the second gas outlet hole (4) of the second gas inlet pipeline (2), so that the second gas discharged from the second gas outlet hole (4) at the gas outlet end of the second gas inlet pipeline (2) enters the gas mixing pipeline (1) and mixes with the first gas;

[0019] Preferably, the pressure of the first gas is higher than the pressure of the second gas; more preferably, the pressure of the first gas is 0.03 to 0.5 MPa higher than that of the second gas.

[0020] The mixing method of the present invention utilizes a gas mixing device, which utilizes the principle of pressure to uniformly mix two or more gases with inconsistent pressures without the use of a pressurizing or depressurizing device. The gas mixing device used has a simple structure, is easy and quick to install, and has low modification, installation, and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a schematic structural diagram of a gas mixing device used in the mixing method of the present invention;

[0022] Figure 2 Shown is a schematic structural diagram of a gas mixing device used in the mixing method of the present invention;

[0023] Figure 3 Shown is a schematic structural diagram of a gas mixing device used in the mixing method of the present invention.

[0024] Reference numerals in the figures indicate:

[0025] 1: gas mixing pipeline, 2: second gas inlet pipeline, 3: gas blocking component, 4: second gas outlet, 5: flange, 6: first gas supply device, 7: second gas supply device, 8: gas using device, 9: baffle. DETAILED DESCRIPTION

[0026] like Figures 1 to 3 As shown, the gas mixing device used in the mixing method provided by the present invention includes a gas mixing pipeline 1 and a second gas inlet pipeline 2. The gas mixing pipeline 1 includes an inlet end, an outlet end, and a hollow tube located between the inlet and outlet ends. The inlet end of the gas mixing pipeline 1 is connected to a first gas supply device 6, and the outlet end is the mixed gas outlet end, which is connected to a gas user 8. The first gas supply device 6 delivers a higher-pressure gas to the gas mixing pipeline 1 as the first gas.

[0027] The second gas inlet pipeline 2 includes a pipeline body, which extends from the outside of the gas mixing pipeline 1 through the side wall of the pipeline body into the hollow body of the gas mixing pipeline 1. The second gas inlet pipeline 2 also includes an inlet end and an outlet end located at both ends of the pipeline body. The inlet end is located outside the gas mixing pipeline 1 and is connected to the second gas supply device 7; the outlet end is located within the hollow body of the gas mixing pipeline 1 and faces the inlet end of the gas mixing pipeline 1. The second gas supply device 7 delivers a gas with a lower pressure (lower than the first gas) into the gas mixing pipeline 1 as the second gas. The outlet end of the second gas inlet pipeline 2 is provided with a second gas outlet hole 4 in the wall. The diameter and number of the second gas outlet holes 4 are not limited and are determined by factors such as the pressure of the first gas and the second gas, and the flow rate of the mixed gas. The outlet end of the second gas inlet pipeline 2 is connected to a gas blocking component 3. The end of the gas blocking component 3 is closed, so that the second gas can only communicate with the gas mixing pipeline 1 through the second gas outlet hole 4. The diameter of the second gas inlet conduit 2 is 0.5 to 0.8 times the diameter of the bottom surface of the gas barrier component 3 (the surface connected to the second gas inlet conduit 2 is the bottom surface). A diameter that is too small will result in a low second gas flow rate, while a diameter that is too large will result in a small negative pressure area. In other words, whether the diameter of the second gas inlet conduit 2 is too large or too small, the content of the second gas in the mixed gas will be reduced, making it difficult to ensure that the carbon content in the combustion exhaust gas meets the standard. Furthermore, for example, if the first gas is natural gas (primarily composed of CH₄) and the second gas is H₂, an overly large or undersized diameter of the second gas inlet conduit 2 can also result in the calorific value of the fuel combustion not meeting the desired value, thereby reducing the efficiency of melting the glass raw material. Furthermore, an overly large diameter of the second gas inlet conduit 2 can block the high-pressure first gas, resulting in low gas pressure and flow rate at the outlet of the gas mixing conduit 1. This ultimately leads to insufficient calorific value generated by the fuel combustion, reducing the efficiency of melting the glass raw material.

[0028] The gas blocking component 3 is a curved geometric solid (or a curved solid) with the central axis of the gas mixing pipeline 1 as its axis. This curved geometric solid can be any shape of revolution, such as a cone, a truncated cone, a hemisphere, a semi-ellipsoid, etc., with one end having a larger area (called the bottom surface) and the other end having a smaller area (called the top surface), and all cross-sections perpendicular to the axis (except the top surface) being circular. The larger end (i.e., the bottom surface) of the gas blocking component 3 faces the second gas inlet pipeline 2 and is sealed (e.g., welded) to the wall of the outlet end of the second gas inlet pipeline 2. The smaller end (i.e., the top surface) faces the inlet end of the gas mixing pipeline 1 and is a closed end. The ratio of the diameter of the second gas inlet pipe 2 to the diameter of the bottom surface (large end) of the gas blocking component 3 is 0.5~0.8, the ratio of the diameter of the bottom surface of the gas blocking component 3 to the inner diameter of the gas mixing pipe 1 is 0.45~0.7, and the length of the gas blocking component 3 in the direction of the central axis of the gas mixing pipe 1 is 0.2-1 of the diameter of the bottom surface of the gas blocking component 3, and the diameter ratio of its top surface to the bottom surface is ≤0.7.

[0029] One embodiment of the gas blocking member 3 is a cone, such as Figure 1 As shown, the bottom surface of the cone (also called the big end because it is the end with the larger area) is sealed and connected to the outlet end of the second gas inlet pipe 2 by welding. The apex of the cone (also called the small end because it is the end with the smaller area) is located on the central axis of the gas mixing pipe 1, and the axis of the cone coincides with the central axis of the gas mixing pipe 1. The diameter of the circular bottom surface of the gas blocking component 3 of the cone is 0.45 to 0.7 of the inner diameter of the gas mixing pipe 1, and the diameter of the second gas inlet pipe 2 is 0.5 to 0.8 of the diameter of the circular bottom surface of the gas blocking component 3. The distance h from the apex of the cone to its bottom surface (i.e., the length of the gas blocking component 3 along the central axis of the gas mixing pipe 1) is 0.2 to 1 of the diameter of its circular bottom surface.

[0030] Another embodiment of the gas blocking member 3 is a truncated cone (not shown in the figure, refer to Figure 2 ), the axis of the frustum coincides with the central axis of the gas mixing pipe 1, the bottom surface (large end) of the frustum is sealed and connected to the edge of the gas outlet end of the second gas inlet pipe 2 (for example, by welding), and the top surface (small end) faces the gas inlet end of the gas mixing pipe 1 and is a closed end. The diameter of the circular bottom surface of the frustum is 0.45 to 0.7 of the inner diameter of the gas mixing pipe 1, the diameter of the second gas inlet pipe 2 is 0.5 to 0.8 of the diameter of the circular bottom surface of the frustum, the distance h between the top and bottom surfaces of the frustum (i.e., the length of the gas blocking component 3 along the central axis of the gas mixing pipe 1) is 0.2-1 of the diameter of its bottom surface, preferably 0.4-0.8, and the diameter ratio between the top and bottom surfaces does not exceed 0.7.

[0031] Another embodiment of the gas blocking member 3 is a trumpet-shaped structure, such as Figure 2As shown, the axis of the trumpet-shaped structure coincides with the central axis of the gas mixing pipe 1. The bottom surface (large end) of the trumpet-shaped structure is sealed with the edge of the gas outlet end of the second gas inlet pipe 2, and the top surface (small end) faces the gas inlet end of the gas mixing pipe 1 and is a closed end. The diameter of the circular bottom surface of the trumpet-shaped structure is 0.45 to 0.7 of the inner diameter of the gas mixing pipe 1, and the diameter of the second gas inlet pipe 2 is 0.5 to 0.8 of the diameter of the circular bottom surface of the trumpet-shaped structure. The distance h between the top and bottom surfaces of the trumpet-shaped structure (i.e., the length of the gas blocking component 3 along the central axis of the gas mixing pipe 1) is 0.2 to 1 of the diameter of the bottom surface of the large end, preferably 0.5 to 0.7. The diameter ratio between the top and bottom surfaces does not exceed 0.7.

[0032] Another embodiment of the gas blocking member 3 is a hemisphere or a hemi-ellipsoid (e.g. Figure 3 As shown), the axis of the hemisphere or hemi-ellipsoid coincides with the central axis of the gas mixing pipe 1, the bottom surface (large end) of the hemisphere or hemi-ellipsoid is sealed with the edge of the gas outlet end of the second gas inlet pipe 2, and the top surface (small end, i.e., spherical end) faces the gas inlet end of the gas mixing pipe 1 and is a closed end. The bottom diameter of the hemisphere or hemi-ellipsoid is 0.45 to 0.7 of the inner diameter of the gas mixing pipe 1, and the diameter of the second gas inlet pipe 2 is 0.5 to 0.8 of the bottom diameter of the hemisphere or hemi-ellipsoid. The distance h from the highest point of the sphere in the hemisphere (i.e., the plane where the vertex is located, also called the top surface) to the bottom surface (i.e., the length of the gas blocking component 3 along the central axis of the gas mixing pipe 1) is 0.2-1 of its bottom diameter, preferably 0.2-0.6.

[0033] To prevent the evenly mixed gas fuel from re-stratifying due to density differences, multiple baffles 9 are installed on the inner wall of the outlet end of the mixing duct 1. These baffles 9 face the central axis of the mixing duct 1 and are inclined in the direction of gas outflow. The angle between the baffles 9 and the vertical (i.e., the radial direction of the mixing duct 1) is 20°-60°. Each baffle 9 has one end positioned on the inner wall of the mixing duct 1 and the other end extending toward the axis of the mixing duct 1. The mixing ducts 1 do not overlap each other. The length L of the baffles 9 extending within the mixing duct 1 is 0.4-0.6 of the diameter of the mixing duct 1. The baffles 9 can be distributed in one or more layers along the axial direction of the mixing duct 1. The layer of baffles 9 closest to the inlet end of the mixing duct 1 is located on the rear side of the second gas inlet line 2 (with the inlet end of the mixing duct 1 as the front side and the outlet end as the rear side). The baffles 9 can also be staggered along the inner wall of the mixing duct 1, for example, in a spiral pattern along the radial and axial directions of the mixing duct 1.

[0034] The working process of the gas mixing device used in the mixing method of the present invention is as follows: the first gas with a higher pressure enters through the air inlet end of the mixing pipe 1, and the second gas with a lower pressure enters through the air inlet end through the second gas inlet pipe 2. In the process of the first gas moving toward the air outlet end of the mixing pipe 1, under the blocking effect of the gas blocking component 3, a negative pressure area is formed at the air outlet end of the second gas inlet pipe 2, especially near the position of the second gas outlet hole 4, so that the second gas with a lower pressure can smoothly enter the mixing pipe 1 and mix with the first gas. The gas mixing device used in the mixing method of the present invention can be detachably mounted on the gas pipeline (preferably at a position as close as possible to the air inlet end of the gas device 8) through a flange 5 to communicate with the gas device 8. For example, when the gas device 8 is a glass melting furnace combustion spray gun, the gas pipeline is the fuel delivery pipeline of the spray gun. Multiple gas mixing devices used in the mixing method of the present invention can be set on the gas pipeline. It is only necessary to install the third gas supply device, the fourth gas supply device, etc. on the gas mixing pipeline 1 according to the pressure of the gas to be mixed. Regardless of whether the pressure of the third gas is lower than or higher than the pressure of the gas in the corresponding section of the gas mixing pipeline, uniform gas mixing can be achieved.

[0035] The following describes the content of the present invention in more detail with reference to the accompanying drawings and specific embodiments, and further elaborates on the present invention. However, these embodiments are by no means intended to limit the present invention.

[0036] Example 1

[0037] A gas mixing device comprises a gas mixing pipeline 1, a second gas inlet pipeline 2, Figure 1 The conical gas blocking component 3, gas outlet 4 and flange 5 are shown. Among them, the diameter of the mixed gas pipeline 1 is 200mm, the bottom diameter of the conical gas blocking component 3 is 100mm, the diameter of the second gas inlet pipeline 2 is 60mm, and the distance h from the apex to the bottom of the cone is 68mm. Baffles 9 are provided at the top and bottom of the inner wall of the outlet end of the mixed gas pipeline 1. The angle between the baffle 9 and the vertical direction is 30°, and the length L of the baffle 9 extending in the mixed gas pipeline 1 is 115mm. The first gas is natural gas. The pressure at the inlet end of the mixed gas pipeline 1 (the same below) is 0.6MPa, and the flow rate is 800Nm 3 / h, the second gas is hydrogen, the pressure at the inlet end of the second gas inlet pipeline 2 (the same below) is 0.45MPa, and the flow rate is 200Nm 3 / h. After testing, the mixed gas flow rate at the connection between the outlet end of the mixed gas pipe 1 and the combustion spray gun is 1000Nm 3 / h; Here, the vertical and horizontal radial inner walls of the pipeline (i.e., along the axial direction of the gas mixing pipeline 1, the detection devices are respectively arranged at the upper, lower, left and right four inner wall positions of the connection plane, from Figure 1From the perspective of the embodiment, four devices for detecting the volume percentage of the second gas are respectively provided on the inner wall of the top tube, the inner wall of the bottom tube, the inner wall in front of the tube and the inner wall in back of the tube (the same below). After detection, the volume percentage of the second gas are respectively 20% on the top wall, 20% on the bottom wall, 19.8% on the front wall and 20.1% on the back wall. It can be seen that after mixing in this embodiment, the two fuel gases with large pressure difference are evenly mixed.

[0038] Example 2

[0039] A gas mixing device comprises a gas mixing pipeline 1, a second gas inlet pipeline 2, Figure 2 The trumpet-shaped gas blocking component 3, gas outlet 4 and flange 5 are shown. Among them, the diameter of the gas mixing pipeline 1 is 200mm, the bottom diameter of the trumpet-shaped gas blocking component 3 is 120mm, the top diameter is 80mm, the diameter of the second gas inlet pipeline 2 is 70mm, and the distance h between the bottom and top surfaces of the trumpet is 70mm. Baffles 9 are provided at the top and bottom of the inner wall of the gas outlet end of the gas mixing pipeline 1. The angle between the baffle 9 and the vertical direction is 30°, and the length L of the baffle 9 extending in the gas mixing pipeline 1 is 120mm. The first gas is generator gas with a pressure of 0.6MPa and a flow rate of 800Nm 3 / h, the second gas is hydrogen with a pressure of 0.45 MPa and a flow rate of 200 Nm 3 / h. After testing, the mixed gas flow rate at the outlet of the mixed gas pipeline is 1000Nm 3 / h, the volume percentages of the second gas are 20% on the top wall, 19.9% ​​on the bottom wall, 20% on the front wall, and 20.2% on the rear wall. It can be seen that after mixing in this embodiment, the two fuel gases with large pressure differences are evenly mixed.

[0040] Example 3

[0041] A gas mixing device comprises a gas mixing pipeline 1, a second gas inlet pipeline 2, Figure 3 The semi-ellipsoidal gas blocking component 3, gas outlet 4 and flange 5 are shown. Among them, the diameter of the mixed gas pipeline 1 is 220mm, the diameter of the semi-ellipsoidal gas blocking component 3 is 100mm, the diameter of the second gas inlet pipeline 2 is 50mm, and the distance h from the vertex to the bottom of the semi-ellipsoid is 40mm. Baffles 9 are provided at the top and bottom of the inner wall of the outlet end of the mixed gas pipeline 1. The angle between the baffle 9 and the vertical direction is 30°, and the length L of the baffle 9 extending in the mixed gas pipeline 1 is 110mm. The first gas is coke oven gas with a pressure of 0.6MPa and a flow rate of 900Nm 3 / h, the second gas is hydrogen with a pressure of 0.12 MPa and a flow rate of 150 Nm 3 / h. After testing, the mixed gas flow rate at the outlet of the mixed gas pipeline is 1050Nm 3 / h, the volume percentages of the second gas are 14.30% on the top wall, 14.25% on the bottom wall, 14.26% on the front wall, and 14.28% on the rear wall. It can be seen that after mixing in this embodiment, the two fuel gases with large pressure differences are evenly mixed.

[0042] Comparative Example 1

[0043] The gas mixing device is exactly the same as that of Example 1, except that the diameter of the second gas inlet pipe 2 is 85 mm. After testing, the mixed gas flow rate at the outlet of the mixing pipe is 800 Nm 3 / h, the volume percentage of the second gas is 0% on the top wall, 0% on the bottom wall, 0% on the front wall, and 0% on the rear wall, respectively. This indicates that the pressure difference between the first gas near the second gas outlet and the second gas is insufficient to allow the second gas to be discharged from the second gas outlet to the gas mixing pipe. Not only does the fuel gas flow at the outlet end of the mixing pipe fail to reach the designed flow, making it difficult to ensure the melting efficiency of the melting furnace, but the second gas content is also far lower than the designed content, making it difficult to ensure that the CO2 content in the combustion exhaust gas is up to standard.

[0044] Comparative Example 2

[0045] The gas mixing device is exactly the same as that of Example 1, except that the diameter of the gas mixing pipe 1 is 125 mm. After testing, the mixed gas flow rate at the outlet of the gas mixing pipe is 800 Nm 3 / h, the volume percentage of the second gas is 25% on the top wall, 24.5% on the bottom wall, 24.8% on the front wall, and 24.8% on the rear wall. It can be seen that the fuel gas flow rate at the outlet of the mixing pipe is less than 1000Nm 3 / h, which means the melting efficiency of the glass melting furnace is reduced, making it difficult to ensure the furnace's production capacity. Furthermore, the diameters of the gas blocking member 3 and the gas mixing pipe 1 are too large, and the gas blocking member 3's blocking effect on the first gas is too strong, causing the fuel gas flow rate at the outlet of the mixing pipe to fail to reach the designed flow rate. The second gas content in the mixed gas is also too high, which reduces the melting efficiency of the furnace and prevents the furnace from achieving the planned production capacity.

[0046] Comparative Example 3

[0047] The gas mixing device is exactly the same as that of Example 1, except that the diameter of the second gas inlet pipe 2 is 40 mm. The pressure of the first gas is 0.6 MPa and the flow rate is 800 Nm 3 / h, the second gas pressure is 0.45MPa, and the flow rate is 200Nm 3 / h. After testing, the mixed gas flow rate at the outlet of the mixed gas pipeline is 830Nm 3 / h, the volume percentage of the second gas is 3.61% on the top wall, 3.60% on the bottom wall, 3.59% on the front wall, and 3.60% on the rear wall, indicating that the diameter of the second gas inlet pipeline 2 is too small, and it is difficult for the second gas to enter the gas mixing pipeline. Not only does the fuel gas flow rate at the outlet end of the mixing pipeline fail to reach the designed flow rate, making it difficult to ensure the melting efficiency of the melting furnace, but the second gas content is also far lower than the designed content, making it difficult to ensure that the CO2 content in the combustion exhaust gas is qualified.

[0048] Comparative Example 4

[0049] The gas mixing device is exactly the same as that of Example 1, except that the diameter of the gas mixing pipe 1 is 300 mm. The first gas pressure is 0.6 MPa and the flow rate is 800 Nm 3 / h, the second gas pressure is 0.45MPa, and the flow rate is 200Nm 3 / h. After testing, the mixed gas flow rate at the outlet of the mixed gas pipeline is 848Nm 3 / h, the volume percentage of the second gas is 5.90% on the top wall, 5.78% on the bottom wall, 5.85% on the front wall and 5.85% on the rear wall, indicating that the diameter ratio of the gas blocking component 3 to the gas mixing pipe 1 is too small, and the blocking effect on the first gas is insufficient, so that the second gas cannot fully enter the gas mixing pipe. Not only does the fuel gas flow at the gas outlet end of the mixing pipe fail to reach the designed flow, making it difficult to ensure the melting efficiency of the melting furnace, the second gas content is also far lower than the designed content, making it difficult to ensure that the CO2 content in the combustion exhaust gas is qualified.

[0050] Comparative Example 5

[0051] The gas mixing device is exactly the same as that of Example 1, except that the distance h from the top to the bottom of the conical gas blocking component 3 is 15 mm. After testing, the mixed gas flow rate at the outlet of the mixed gas pipeline is 872 Nm 3 / h, the volume percentage of the second gas is 22.94% on the top wall, 22.85% on the bottom wall, 22.92% on the front wall, and 22.93% on the rear wall. It can be seen that the fuel gas flow rate at the outlet of the mixing pipe is less than 1000Nm 3 / h, which means the melting efficiency of the glass melting furnace is reduced, making it difficult to ensure the furnace's production capacity. At the same time, the second gas content in the mixed gas exceeds 20%, indicating that the gas blocking component 3 has too strong an effect on the first gas, causing the fuel gas flow rate at the outlet of the mixing pipe to fail to reach the designed flow rate. The second gas content in the mixed gas is also too high, which reduces the melting efficiency of the melting furnace and prevents the furnace from achieving the planned production capacity.

[0052] Comparative Example 6

[0053] The gas mixing device is exactly the same as that of Example 1, except that the distance h from the top to the bottom of the conical gas blocking component 3 is 120 mm. After testing, the mixed gas flow rate at the outlet of the mixed gas pipeline is 860 Nm 3 / h, the volume percentage of the second gas is 6.98% on the top wall, 6.95% on the bottom wall, 6.97% on the front wall, and 6.96% on the rear wall. It can be seen that the fuel gas flow rate at the outlet of the mixing pipe is less than 1000Nm 3 / h, which means the melting efficiency of the glass melting furnace is reduced, making it difficult to ensure the furnace's production capacity. At the same time, the second gas content in the mixed gas is less than 20%, indicating that the gas blocking component 3's blocking effect on the first gas is too weak. The pressure difference between the first gas near the second gas outlet and the second gas is insufficient to allow the second gas to be fully discharged from the second gas outlet into the gas mixing pipe. Not only does the fuel gas flow rate at the outlet of the mixing pipe fail to reach the designed flow rate, making it difficult to ensure the melting efficiency of the melting furnace, but the second gas content is also far below the designed content, making it difficult to ensure the acceptable CO2 content in the combustion exhaust gas.

[0054] Comparative Example 7

[0055] The gas mixing device is exactly the same as that of Example 1, except that the angle between the baffle 9 and the radial direction of the gas mixing pipe 1 is 18°. After testing, the mixed gas flow rate at the outlet of the gas mixing pipe is 650Nm 3 / h, the volume percentages of the second gas are 20% on the top wall, 19.5% on the bottom wall, 19.9% ​​on the front wall, and 19.9% ​​on the rear wall. It can be seen that the angle of the baffle 9 is too small, which has a strong blocking effect on the mixed gas. As a result, the fuel gas flow rate at the outlet of the mixing pipe does not reach the designed flow rate, making it difficult to ensure the melting efficiency of the glass melting furnace. This means that the melting efficiency of the glass melting furnace is reduced, making it difficult to ensure the production capacity of the melting furnace.

[0056] Comparative Example 8

[0057] The gas mixing device is exactly the same as that of Example 1, except that the angle between the baffle 9 and the radial direction of the gas mixing pipe 1 is 70°. After testing, the mixed gas flow rate at the outlet of the gas mixing pipe is 800Nm 3 / h, the volume percentages of the second gas are 25% on the top wall, 20.5% on the bottom wall, 22.2% on the front wall, and 22.3% on the rear wall. It can be seen that the excessively large angle of the baffle 9 has a poor mixing effect on the mixed gas, causing the first and second gases to separate due to density differences. The second gas, due to its lower density, has a higher content at the top than at the bottom, resulting in uneven mixing of the two gases.

[0058] Comparative Example 9

[0059] The gas mixing device is exactly the same as that of Example 1, except that the length L of the baffle 9 extending in the gas mixing pipe 1 is 75 mm. After testing, the mixed gas flow rate at the outlet of the gas mixing pipe is 1000 Nm3 / h, the volume percentage of the second gas is 24% on the top wall, 19.5% on the bottom wall, 21.4% on the front wall, and 21.35% on the rear wall. It can be seen that the baffle 9 is too short, which has a poor mixing effect on the mixed gas. The first gas and the second gas are separated due to the density difference. The second gas has a higher content at the top than at the bottom due to its lower density, and the two gases are mixed unevenly.

[0060] Comparative Example 10

[0061] The gas mixing device is exactly the same as that of Example 1, except that the length L of the baffle 9 extending in the gas mixing pipe 1 is 160 mm. After testing, the mixed gas flow rate at the outlet of the gas mixing pipe is 800 Nm 3 / h, and the volume percentages of the second gas are 20% on the top wall, 19.9% ​​on the bottom wall, 20% on the front wall, and 20% on the rear wall. It can be seen that the excessively long baffle 9 has an excessively strong blocking effect on the mixed gas, causing the fuel gas flow rate at the outlet end of the mixing pipe to fail to reach the designed flow rate, making it difficult to ensure the melting efficiency of the glass melting furnace, which means that the melting efficiency of the glass melting furnace is reduced and it is difficult to ensure the production capacity of the melting furnace.

[0062] The gas mixing device used in the present invention utilizes the principle of pressure and can evenly mix two gases with a pressure difference of 0.03 to 0.5 MPa (especially 0.1-0.5 MPa) without using a boosting or decompression device, effectively solving the problem that gases under different pressure conditions are difficult to mix or are mixed unevenly. The device has a simple structure, is easy and quick to install, and is easy to use. The gas mixing capacity of the gas mixing device can be set according to the gas flow rate and the demand of the glass melting furnace for gas fuel, and can meet the use requirements of glass melting furnaces with different gas fuel demands. The gas mixing device can mix gases of different types and properties (such as pressure, flow rate, density), and can form a uniform airflow without forming gas stratification.

[0063] 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 principles of the present invention. These improvements and modifications should also be regarded as the content of the present invention.

Claims

1. A method for mixing fuel for a glass melting furnace, characterized in that: A gas mixing device is added to the fuel delivery pipeline at a position as close as possible to the fuel spray gun, the gas mixing device comprising a gas mixing pipeline (1) and a second gas intake pipeline (2); wherein, The gas mixing pipeline (1) comprises an inlet end connected to the first gas supply device (6), an outlet end connected to the gas using device (8), and a hollow tube body located between the inlet end and the outlet end; The second gas inlet pipeline (2) comprises an inlet end connected in sequence to the second gas supply device (7), a pipeline body extending from the outside of the gas mixing pipeline (1) through the side wall of the gas mixing pipeline (1) to the inside of the hollow tube body thereof, and an outlet end located in the hollow tube body of the gas mixing pipeline (1) and facing the inlet end of the gas mixing pipeline (1). A second gas outlet hole (4) for connecting the second gas inlet pipeline (2) with the gas mixing pipeline (1) is provided on the side wall of the pipeline body located near the outlet end of the second gas inlet pipeline (2); The end of the outlet end of the second gas inlet pipeline (2) is connected to a gas blocking component (3) having a curved three-dimensional structure. One end of the gas blocking component (3) is sealed and connected to the outlet end of the second gas inlet pipeline (2) and serves as a connecting end. The gas blocking component (3) extends along the outlet end of the second gas inlet pipeline (2) toward the inlet end of the mixing gas pipeline (1). The other end thereof close to the inlet end of the mixing gas pipeline (1) is a closed end. The curved three-dimensional structure is a structure that enables a first gas having a higher pressure than that of a second gas to form a negative pressure area near the second outlet hole (4) when flowing through the second gas outlet hole (4); preferably, the negative pressure area enables the second gas to be fully discharged into the mixing gas pipeline (1).

2. The mixing method according to claim 1, characterized in that The curved three-dimensional structure is a body of revolution, and the axis of the body of revolution overlaps with the central axis of the gas mixing pipe (1).

3. The mixing method according to claim 2, characterized in that Any cross section of the rotating body perpendicular to the axis except the closed end is circular.

4. The mixing method according to claim 3, characterized in that The area of ​​the closed end of the gas blocking component (3) is smaller than the area of ​​the connecting end.

5. The mixing method according to claim 3 or 4, characterized in that The ratio of the diameter of the connection end of the gas blocking component (3) to the inner diameter of the gas mixing pipe (1) is 0.45 to 0.

7.

6. The mixing method according to any one of claims 3 to 5, characterized in that: The ratio of the diameter of the second gas inlet pipeline (2) to the diameter of the connecting end of the gas blocking component (3) is 0.5 to 0.

8.

7. The mixing method according to claim 6, characterized in that The gas blocking component (3) is a rotating body in the shape of a cone, a hemisphere, a semi-ellipsoid, a truncated cone, a trumpet, etc.

8. The mixing method according to claim 7, characterized in that The length of the gas blocking component (3) along the central axis of the gas mixing pipe (1) is 0.2-1 of the diameter of the connecting end of the gas blocking component (3). Optionally, the diameter ratio of the closed end to the connecting end is ≤0.

7.

9. The mixing method according to claim 8, characterized in that A plurality of baffles (9) are provided on the inner wall of the gas outlet end of the gas mixing pipe (1), facing the central axis of the gas mixing pipe (1) and inclined in the gas outflow direction, and the angle between the baffles (9) and the radial direction of the gas mixing pipe (1) is 20°-60°; one end of each baffle (9) is provided on the inner wall of the gas mixing pipe (1), and the other end extends toward the axis of the gas mixing pipe (1); the length L of the baffle (9) extending in the gas mixing pipe (1) is 0.4-0.6 of the diameter of the gas mixing pipe (1); Preferably, the baffles (9) can be distributed in one or more layers along the axial direction of the gas mixing pipe (1), and the layer of baffles (9) closest to the gas inlet end of the gas mixing pipe (1) is located at the rear side of the second gas inlet pipeline (2); Optionally, the baffles (9) may also be distributed at intervals and in a staggered manner along the inner wall of the gas mixing pipe (1).

10. The mixing method according to any one of claims 1 to 9, characterized in that: The first gas enters through the gas inlet end of the gas mixing pipeline (1), and the second gas enters through the gas inlet end of the second gas inlet pipeline (2); in the process of the first gas moving toward the gas outlet end of the gas mixing pipeline (1), under the blocking action of the gas blocking component (3), a negative pressure area is formed near the position of the second gas outlet hole (4) of the second gas inlet pipeline (2), so that the second gas discharged from the second gas outlet hole (4) at the gas outlet end of the second gas inlet pipeline (2) enters the gas mixing pipeline (1) and mixes with the first gas; Preferably, the pressure of the first gas is higher than the pressure of the second gas; more preferably, the pressure of the first gas is 0.03 to 0.5 MPa higher than that of the second gas.

Images