Oxygen-enriched mixing device of combustor

Abstract

A first oxygen inlet and a second oxygen inlet are symmetrically connected to the upper end and the lower end of a mixing box respectively, and an air inlet and an oxygen-enriched gas outlet are symmetrically formed in the left side end and the right side end of the mixing box respectively. The central axis of the first oxygen inlet and the central axis of the second oxygen inlet are staggered with the central axis of the air inlet and the central axis of the oxygen-enriched gas outlet and distributed in a cross shape, a conical cap is connected to the end, located at the oxygen-enriched gas outlet, in the mixing box, and the conical cap, the air inlet and the oxygen-enriched gas outlet are coaxially arranged. The top end of the conical end of the conical cap does not exceed the central axis of the first oxygen inlet and the central axis of the second oxygen inlet, and the upper end and the lower end of the side, away from the conical end, of the conical cap are connected with conical cap supports correspondingly and connected with the inner wall of the mixing box. The stability of gas supply is improved, and basic conditions are provided for effectively stabilizing the running state of equipment.

Description

Technical Field

[0001] This utility model relates to the field of combustion equipment technology, specifically to a burner oxygen-enriched mixing device. Background Technology

[0002] In the pursuit of ultimate energy efficiency, the modern metallurgical industry has widely adopted burner equipment in metallurgical and steel enterprises. For example, burners are used in sintering gas combustion furnaces, blast furnace hot blast stoves, ladle baking furnaces, and rolling mill heating furnaces. Oxygen-enriched combustion technology not only increases combustion temperature and accelerates thermal reaction efficiency but also effectively saves fuel and reduces costs. However, increasing the oxygen content in the air is not simply a matter of increasing the amount of oxygen. Considering safety factors, air and oxygen must be thoroughly mixed to ensure a more stable combustion process. By controlling the oxygen enrichment and accurately calculating energy consumption, more efficient energy utilization can be achieved. Currently, the common method for increasing oxygen enrichment is to directly connect branch oxygen pipelines to the main air pipeline, mixing the oxygen and air before it enters the main pipe, and then using the pressure of the main pipe to drive the gas supply. However, this method has a problem: uneven mixing of oxygen and air causes flame fluctuations when the gas reaches the burner, affecting the stability and efficiency of combustion. Utility Model Content

[0003] The purpose of this invention is to provide a burner oxygen-enriched mixing device to solve the problem that the commonly used method of increasing oxygen enrichment is to directly connect the branch oxygen pipeline to the main air pipeline, mix the oxygen and air and then enter the main pipe, and then use the pressure of the main pipe to push the gas supply. However, this method has a problem, namely, uneven mixing of oxygen and air, which causes flame fluctuation when the gas reaches the burner, affecting the stability and efficiency of combustion.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a burner oxygen-enriched mixing device, comprising a mixing box, an air inlet, an oxygen-enriched gas outlet, a first oxygen inlet, a second oxygen inlet, a conical cap, a conical cap bracket, and a cross-shaped annular reinforcing rib. The mixing box is a rectangular hollow shell, with its upper and lower ends symmetrically connected to the first oxygen inlet and the second oxygen inlet, respectively. Its left and right sides are symmetrically provided with an air inlet and an oxygen-enriched gas outlet, respectively. The central axes of the first oxygen inlet and the second oxygen inlet intersect with the central axes of the air inlet and the oxygen-enriched gas outlet and are arranged in a cross shape. A conical cap is connected to one end of the mixing box located at the oxygen-enriched gas outlet. The conical cap is coaxially arranged with the air inlet and the oxygen-enriched gas outlet, and the top of the conical end of the conical cap does not exceed the cut-off end on the side of the conical end corresponding to the first oxygen inlet and the second oxygen inlet. The upper and lower ends of the side of the conical cap away from the conical end are respectively connected to the conical cap bracket and connected to the inner wall of the mixing box.

[0005] Preferably, the mixing box, conical cap, conical cap bracket, and cross-shaped reinforcing rib are all made of 304 / 316 stainless steel.

[0006] Preferably, the air inlet, the oxygen-enriched gas outlet, the first oxygen inlet, and the second oxygen inlet are all connected to the gas source pipeline flange.

[0007] Preferably, the air inlet, oxygen-enriched gas outlet, first oxygen inlet, second oxygen inlet, and the pipes and flanges connected to the interface are all made of Q345B carbon steel.

[0008] Preferably, the mixing box has symmetrical cross-shaped reinforcing ribs on both the front and rear sides, and the top of each cross-shaped reinforcing rib is connected to the four corners of the front and rear sides of the mixing box to reinforce the structure of the mixing box.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] This design boasts advantages such as simple structure and low manufacturing cost, making it suitable for various burners and thermal equipment. By employing a conical structure to premix oxygen and combustion air, it ensures uniformity of components in the combustion gas, thereby effectively improving the stability of the gas supply. This innovative design not only provides effective assurance for the stable operation of the equipment and reduces the risk of system failure, but also significantly improves combustion efficiency and energy utilization. It creates the foundation for precisely improving production efficiency and reducing energy consumption. This technology can be widely applied in industries such as metallurgy, steel, and chemicals, and has high market application prospects. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the right side structure of the conical cap of this utility model.

[0013] Figure 3 This is a schematic diagram of the layout of the conical cap of this utility model.

[0014] In the diagram: 1. Air inlet; 2. Oxygen-enriched gas outlet; 3. First oxygen inlet; 4. Second oxygen inlet; 5. Conical cap; 6. Conical cap support; 7. Cross-shaped reinforcing rib. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1: Please refer to Figure 1-2This utility model provides an embodiment of a burner oxygen-enriched mixing device, comprising a mixing chamber, an air inlet 1, an oxygen-enriched gas outlet 2, a first oxygen inlet 3, a second oxygen inlet 4, a conical cap 5, a conical cap support 6, and a cross-shaped annular reinforcing rib 7. The mixing chamber is a rectangular hollow shell and is the main part of the system, serving to contain and guide the airflow mixing. It provides space for different gases (air, oxygen-enriched gas, and oxygen) to mix in order to generate the desired mixed gas. Its upper and lower ends are symmetrically connected to the first oxygen inlet 3 and the second oxygen inlet 4, respectively. The first oxygen inlet 3 and the second oxygen inlet 4 are used to introduce oxygen into the mixing chamber. The amount of oxygen introduced and the flow state within the mixing chamber directly affect the oxygen enrichment. The oxygen gas concentration is symmetrically arranged at the upper and lower ends of the mixing chamber. When oxygen enters, the oxygen at the upper and lower ends first undergoes impact mixing. Simultaneously, combustion air from air inlet 1 enters the mixing chamber, and air inlet 1, along with the first oxygen inlet 3 and the second oxygen inlet 4, are arranged in a T-shape. Part of the combustion air mixes with the oxygen, while the other part impacts the conical cap 5. After being guided by the conical cap 5, the impacted gas circulates within the mixing chamber, further mixing with the oxygen entering from the first oxygen inlet 3 and the second oxygen inlet 4 to form oxygen-enriched gas. Air inlets 1 and 2 are symmetrically arranged at the left and right ends to introduce combustion air into the mixing chamber. This is the inlet for external air to flow into the system. The airflow is controlled to ensure sufficient air participates in the mixing process. Oxygen-enriched gas outlet 2 is used to discharge the mixed oxygen-enriched gas, which is a mixture of air and oxygen. This outlet ensures the oxygen-enriched gas can be smoothly discharged from the system for subsequent operations. The central axes of the first oxygen inlet 3 and the second oxygen inlet 4 intersect with the central axes of the air inlet 1 and the oxygen-enriched gas outlet 2, forming a cross shape. A conical cap 5 is connected to one end of the oxygen-enriched gas outlet 2 inside the mixing chamber. The main function of the conical cap 5 is to guide the airflow into the mixing chamber and help optimize the airflow distribution. By controlling the direction and speed of the airflow, turbulence in the flow can be reduced, and the uniformity of gas mixing can be improved. The design of the conical cap 5 also... To reduce airflow irregularities, when oxygen and combustion air enter, due to their T-shaped arrangement, a portion of the gas mixes, while the remaining gas, after entering with the combustion air, impacts the conical cap 5. After impacting the conical cap 5, the gas is diverted and circulates within the mixing chamber for further mixing. The conical cap 5 is coaxially positioned with the air inlet 1 and the oxygen-enriched gas outlet 2, ensuring that the combustion air impacts and diverts the conical end of the cap 5, mixing with the oxygen. Furthermore, the top of the conical end of the cap 5 does not exceed the cut-off ends on the corresponding conical ends of the first oxygen inlet 3 and the second oxygen inlet 4, preventing obstruction of oxygen entry into the mixing chamber. Because the first oxygen inlet 3 and the second oxygen inlet 4 are symmetrically positioned, the incoming oxygen is first impacted and mixed.Oxygen overflows from the air inlet 1 and the conical end of the conical cap 5, then mixes with the oxygen. Because the air inlet 1, the first oxygen inlet 3, and the second oxygen inlet 4 are arranged in a T-shape, the incoming air impacts and mixes the oxygen. Conical cap 5 has conical cap supports 6 connected to its upper and lower ends on the side away from the conical end, and these supports are connected to the inner wall of the mixing chamber. The conical cap supports 6 are used to fix the conical cap 5 in the center of the mixing device. The mixing chamber, conical cap 5, conical cap supports 6, and cross-shaped reinforcing ribs 7 are all made of 304 / 316 stainless steel. The use of 304 / 316 stainless steel gives the equipment good corrosion resistance and high temperature resistance. This system is suitable for most industrial gas mixing environments. The mixing chamber and conical cap support 6 are made of stainless steel to ensure long-term stability. Air inlet 1, oxygen-enriched gas outlet 2, first oxygen inlet 3, and second oxygen inlet 4 are all connected to the gas source pipeline flange and sealed with bolts and gaskets. The pipes and flanges connecting air inlet 1, oxygen-enriched gas outlet 2, first oxygen inlet 3, and second oxygen inlet 4 to the interfaces are all made of Q345B carbon steel. Q345B carbon steel pipes and flanges are suitable for transporting oxygen and air, possessing sufficient strength and corrosion resistance.

[0020] When oxygen enters, the oxygen at both ends first undergoes impact mixing. After impact, the gas overflows through air inlet 1 and conical cap 5. Simultaneously, combustion air from air inlet 1 enters the mixing chamber, and air inlet 1, along with the first oxygen inlet 3 and the second oxygen inlet 4, are arranged in a T-shape. After the combustion air enters, part of the gas mixes with the oxygen, while the other part impacts the conical cap 5. Guided by the conical cap 5, the impacted gas circulates within the mixing chamber, further mixing with the oxygen entering from the first oxygen inlet 3 and the second oxygen inlet 4 to form oxygen-enriched gas. This oxygen-enriched gas is then discharged through oxygen-enriched gas outlet 2 for subsequent operations.

[0021] Example 2: Please refer to Figure 1 Based on Example 1, it also has the following structure:

[0022] The mixing chamber has symmetrical cross-shaped reinforcing ribs 7 on both the front and rear sides. The top of the cross-shaped reinforcing ribs 7 is connected to the four apex corners of the front and rear sides of the mixing chamber. These four apex corners serve as connection points. By connecting the reinforcing ribs, they bear the stress from the outside or inside, ensuring that the mixing chamber is not easily deformed or damaged. This is used to reinforce the structure of the mixing chamber. The cross-shaped reinforcing ribs 7 are mainly used to reinforce the structure of the mixing chamber and prevent the chamber from deforming or cracking due to external forces or internal pressure during use. By connecting to the four apex corners of the front and rear sides of the mixing chamber, they provide additional support and enhance the pressure resistance and deformation resistance of the chamber.

[0023] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A burner oxygen-enriched mixing device, characterized in that: The mixture includes a mixing chamber, an air inlet (1), an oxygen-enriched gas outlet (2), a first oxygen inlet (3), a second oxygen inlet (4), a conical cap (5), a conical cap support (6), and a cross-shaped reinforcing rib (7). The mixing chamber is a rectangular hollow shell with symmetrical upper and lower ends connected to the first oxygen inlet (3) and the second oxygen inlet (4), respectively. The left and right sides are symmetrical and respectively equipped with an air inlet (1) and an oxygen-enriched gas outlet (2). The central axis of the first oxygen inlet (3) and the second oxygen inlet (4) is perpendicular to the center line of the mixing chamber. The central axes of the air inlet (1) and the oxygen-enriched gas outlet (2) are intersected and arranged in a cross shape. A conical cap (5) is connected to one end of the oxygen-enriched gas outlet (2) inside the mixing box. The conical cap (5) is coaxially arranged with the air inlet (1) and the oxygen-enriched gas outlet (2). The top of the conical end of the conical cap (5) does not exceed the cut-off end on the side of the conical end corresponding to the first oxygen inlet (3) and the second oxygen inlet (4). The upper and lower ends of the side of the conical cap (5) away from the conical end are respectively connected to the conical cap bracket (6) and connected to the inner wall of the mixing box.

2. The burner oxygen-enriching mixing device according to claim 1, characterized in that: The mixing box, conical cap (5), conical cap bracket (6), and cross-shaped reinforcing rib (7) are all made of 304 / 316 stainless steel.

3. The burner oxygen-enriched mixing device according to claim 1, characterized in that: The air inlet (1), oxygen-enriched gas outlet (2), first oxygen inlet (3), and second oxygen inlet (4) are all connected to the gas source pipeline flange.

4. The burner oxygen-enriching mixing device according to claim 3, characterized in that: The air inlet (1), oxygen-enriched gas outlet (2), first oxygen inlet (3), second oxygen inlet (4) and the pipes and flanges connected to the interface are all made of Q345B carbon steel.

5. The burner oxygen-enriching mixing device according to claim 1, characterized in that: The mixing box has symmetrical front and rear ends and is provided with cross-shaped reinforcing ribs (7). The top of the cross-shaped reinforcing ribs (7) is connected to the four apex corners of the front and rear ends of the mixing box to reinforce the structure of the mixing box.

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