Oxygen-enriched side blowing lance and oxygen-enriched side blowing furnace

Abstract

The utility model discloses an oxygen -enriched side -blowing uses the spray gun and oxygen -enriched side -blowing stove, wherein oxygen -enriched side -blowing uses the spray gun including spray gun seat body and first spray pipe subassembly, spray gun seat body is equipped with oxygen -enriched connection department and fuel connection department, and the oxygen -enriched passage and fuel passage are formed in spray gun seat body, one end of first spray pipe subassembly is connected with spray gun seat body, and first spray pipe subassembly includes nestedly arranged inner tube body and outer tube body, the inner chamber of inner tube body communicates with fuel passage, and the annular cavity is formed between inner tube body and outer tube body, and the annular cavity communicates with oxygen -enriched passage, and at least one of inner tube body and outer tube body is provided with the separation protruding in the one end of annular cavity away from spray gun seat body, and the number of separation protruding is at least two, and at least two separation protruding are sequentially spaced apart along the ring direction of annular cavity to divide the annular cavity and form several air injection ports, compared with the spray gun structure of prior art, the oxygen -enriched side -blowing uses the spray gun to be able to improve the diffusion effect and reaction efficiency of airflow mixed with fuel in the molten pool.

Description

Technical Field

[0001] This utility model belongs to the technical field of smelting equipment, specifically relating to an oxygen-enriched side-blowing spray gun and an oxygen-enriched side-blowing furnace. Background Technology

[0002] Oxygen-enriched side-blown furnace (OESBF) is a technology used in the smelting of laterite nickel ore to convert low-grade nickel matte into high-grade nickel matte through a redox reaction. The OESBF furnace used in the process includes a side-blown lance and a molten pool. The side-blown lance simultaneously injects oxygen-enriched air, sulfurizing agent, and fuel into the molten pool at high speed to achieve the purpose of violently agitating the melt and directly burning to reheat the melt.

[0003] In existing side-blowing spray guns, the airflow at the outlet is turbulent, resulting in poor mixing uniformity between the sprayed material and the reactants in the molten pool, which in turn affects the efficiency of the redox reaction and the quality of high-grade nickel matte. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies, this utility model provides an oxygen-enriched side-blowing spray gun and an oxygen-enriched side-blowing furnace, which aims to solve the technical problem that the airflow turbulence at the outlet of the existing spray gun leads to poor mixing uniformity between the sprayed material and the reactants in the molten pool.

[0005] To achieve the above objectives, the first aspect of this utility model provides an oxygen-enriched side-blowing spray gun, comprising a spray gun base and a first nozzle assembly; the spray gun base is provided with an oxygen-enriched connection portion and a fuel connection portion, and an oxygen-enriched channel and a fuel channel are formed within the spray gun base; one end of the first nozzle assembly is connected to the spray gun base, and the first nozzle assembly includes a nested inner tube and an outer tube, the inner cavity of the inner tube communicating with the fuel channel, and an annular cavity being formed between the inner tube and the outer tube, the annular cavity communicating with the oxygen-enriched channel; at least one of the inner tube and the outer tube has a dividing protrusion protruding from the end of the annular cavity away from the spray gun base, and the number of dividing protrusions is at least two, the at least two dividing protrusions being sequentially spaced along the circumferential direction of the annular cavity to divide the annular cavity into a plurality of air jets. The cross-sectional area of ​​the air jets is set to 4 to 5 times the cross-sectional area of ​​the dividing protrusions, and the sum of the cross-sectional areas of all air jets is set to 2 / 5 to 1 / 2 of the cross-sectional area of ​​the inner tube's inner cavity.

[0006] Through the above technical solution, the oxygen-enriched side-blowing spray gun provided in this utility model embodiment has the following beneficial effects: When using the aforementioned oxygen-enriched side-blowing spray gun, the oxygen-enriched connection part and the fuel connection part are used to dock with the oxygen-enriched supply device and the fuel supply device respectively. The spray gun base is connected to the inner tube and outer tube of the first nozzle assembly, and the spray gun base forms a relatively independent oxygen-enriched channel and a fuel channel. The fuel supplied by the fuel supply device enters the inner tube along the fuel channel, and the oxygen-enriched air supplied by the oxygen-enriched supply device enters the annular cavity between the outer tube and the inner tube along the oxygen-enriched channel, thereby achieving the mixing of fuel and oxygen at the outlet of the nozzle assembly. The cross-sectional area of ​​the jet nozzle is set to 4 to 5 times that of the dividing protrusion, and the sum of the cross-sectional areas of all jet nozzles is set to 2 / 5 to 1 / 2 of the cross-sectional area of ​​the inner tube cavity. When oxygen-enriched air passes through the dividing protrusion, it is separated into multiple independent airflows. Under the guiding effect of the dividing protrusion, these airflows can flow stably along a preset path, effectively avoiding the turbulence caused by irregular diffusion of oxygen-enriched air at the outlet in traditional spray guns. This reduces eddies and energy loss at the outlet, ensuring that the oxygen-enriched air is ejected from the jet nozzle at a more stable speed and direction. This further enhances the diffusion effect and reaction efficiency of the airflow mixed with fuel in the molten pool, thereby improving the quality of the output. Furthermore, the setting of the dividing protrusion is beneficial for controlling back pressure, reducing the reverse resistance on the fuel and air, and preventing blockage at the outlet of the spray gun.

[0007] In this embodiment of the invention, at least two of the dividing protrusions are provided on the inner tube body.

[0008] In this embodiment of the invention, there are four dividing protrusions, which are arranged sequentially at intervals along the periphery of the inner tube.

[0009] In this embodiment of the invention, the width of the dividing protrusion in the circumferential direction along the annular cavity is greater than or equal to the height of the dividing protrusion in the radial direction along the annular cavity.

[0010] In this embodiment of the invention, the ratio of the width of the dividing protrusion in the circumferential direction along the annular cavity to the height of the dividing protrusion in the radial direction along the annular cavity is greater than 6.

[0011] In this embodiment of the present invention, the oxygen-enriched side-blowing spray gun further includes a second nozzle assembly, which is disposed between the spray gun base and the first nozzle assembly. The second nozzle assembly is detachably connected to the spray gun base and the first nozzle assembly, and includes an inner tube and an outer tube nested together.

[0012] In this embodiment of the invention, the fuel channel is arranged in a tapering manner along the feeding direction.

[0013] In this embodiment of the invention, the inclination angle of the peripheral wall of the fuel channel relative to the central axis of the fuel channel is set to 11.5°~12.5°.

[0014] In this embodiment of the utility model, a first flange body is formed at one end of the spray gun base facing away from the fuel connection part, and a stepped surface is formed on the inner side of the first flange body. The first nozzle assembly also includes a second flange body disposed on the outer wall of the outer tube body. The second flange body is embedded in the first flange body and seals against the stepped surface.

[0015] To achieve the above objectives, the second aspect of this utility model provides an oxygen-enriched side-blowing furnace including the above-mentioned oxygen-enriched side-blowing spray gun.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of an oxygen-enriched side-blowing spray gun according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the radial section of the first nozzle assembly in the illustrated embodiment; Figure 3 yes Figure 1 A schematic diagram of the spray gun base in the illustrated embodiment.

[0018] Explanation of reference numerals in the attached figures Detailed Implementation

[0019] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0021] The following is for reference. Figures 1 to 3 This invention describes the oxygen-enriched side-blowing spray gun and the oxygen-enriched side-blowing furnace.

[0022] To achieve the above objectives, the first aspect of this utility model provides an oxygen-enriched side-blowing spray gun, including a spray gun base 1 and a first nozzle assembly 2; the spray gun base 1 is provided with an oxygen-enriched connection portion 11 and a fuel connection portion 12, an oxygen-enriched channel 111 and a fuel channel 121 are formed inside the spray gun base 1, and the fuel connection portion 12 is formed with a fuel channel 121; one end of the first nozzle assembly 2 is connected to the spray gun base 1, and the first nozzle assembly 2 includes an inner tube 21 and an outer tube 22 nested together, the inner cavity of the inner tube 21 is connected to the fuel channel 121, an annular cavity is formed between the inner tube 21 and the outer tube 22, the annular cavity is connected to the oxygen-enriched channel 111, and at least one of the inner tube 21 and the outer tube 22 has a dividing protrusion 23 protruding from the end of the annular cavity away from the spray gun base 1, and the number of dividing protrusions 23 is at least two, and the at least two dividing protrusions 23 are arranged sequentially at intervals along the circumferential direction of the annular cavity to divide the annular cavity into a plurality of air jets 24.

[0023] When using the above-mentioned oxygen-enriched side-blowing spray gun, the oxygen-enriched connection part 11 and the fuel connection part 12 are used to dock with the oxygen-enriched supply device and the fuel supply device respectively. The spray gun base 1 is connected to the inner tube 21 and the outer tube 22 of the first nozzle assembly 2, and the spray gun base 1 forms a relatively independent oxygen-enriched channel 111 and a fuel channel 121. The fuel supplied by the fuel supply device enters the inner tube 21 along the fuel channel 121, and the oxygen-enriched air supplied by the oxygen-enriched supply device enters the annular cavity between the outer tube 22 and the inner tube 21 along the oxygen-enriched channel 111, thereby achieving the mixing of fuel and oxygen at the outlet of the nozzle assembly. Because the annular cavity is equipped with at least two dividing protrusions 23, when oxygen-enriched air passes through the dividing protrusions 23, it is divided into multiple independent airflows. Under the guiding effect of the dividing protrusions 23, these airflows can flow stably along a preset path, effectively avoiding the turbulence caused by irregular diffusion of oxygen-enriched air at the outlet in traditional spray guns. This reduces eddies and energy loss at the outlet, ensuring that the oxygen-enriched air is ejected from the nozzle 24 at a more stable speed and direction. This further enhances the diffusion effect and reaction efficiency of the airflow mixed with fuel in the molten pool, thereby improving the quality of the output. Furthermore, the setting of the dividing protrusions 23 is beneficial for controlling back pressure, reducing the reverse resistance on the fuel and air, and preventing blockage at the outlet of the spray gun.

[0024] Specifically, the cross-sectional area of ​​the jet nozzle 24 is set to 4 to 5 times the cross-sectional area of ​​the dividing protrusion 23, and the sum of the cross-sectional areas of all jet nozzles 24 is set to 2 / 5 to 1 / 2 of the cross-sectional area of ​​the inner cavity of the inner tube 21. By optimizing the cross-sectional area ratio of the jet nozzle 24 to the dividing protrusion 23, the dividing protrusion 23 has sufficient area to suppress the back pressure formed by the gas ejection, reducing the disturbance of the ejected gas by the back pressure. At the same time, the cross-sectional area ratio of a single jet nozzle 24 to the dividing protrusion 23 ensures that each oxygen-rich stream after separation has sufficient kinetic energy when ejected. It avoids the problem of local turbulence caused by excessively high airflow velocity due to an excessively small cross-sectional area, and also avoids the problem of excessively rapid airflow diffusion and insufficient mixing due to an excessively large cross-sectional area. By optimizing the cross-sectional area ratio of the jet nozzle 24 to the inner cavity of the inner tube 21, the fuel gas (such as sulfur) can be in full contact with the oxygen-enriched air. This ensures that the oxygen-enriched air enters the mixing zone at an appropriate flow rate, preventing the fuel from being dispersed by the high-speed airflow due to excessive flow. It also prevents the fuel from accumulating locally and burning incompletely due to insufficient flow. This increases the combustion reaction rate while reducing the waste of unreacted fuel, further reducing production energy consumption.

[0025] In this embodiment of the invention, at least two partition protrusions 23 disposed in the annular cavity may be integrally formed with the inner tube 21 or integrally formed with the outer tube 22. Optionally, at least two partition protrusions 23 are disposed on the inner tube 21. This allows the partition protrusions 23 to be directly installed on the outer surface of the inner tube 21. Compared to the option of placing the partition protrusions 23 on the inner wall of the outer tube 22, this facilitates precise positioning of the partition protrusions and ensures that the size of the oxygen-enriched distribution grooves formed between adjacent partition protrusions remains consistent.

[0026] Specifically, the partition protrusion 23 is connected to the inner tube 21 by welding. In other embodiments, the partition protrusion 23 may also be integrally cast with the inner tube 21.

[0027] Specifically, a guide slope is formed at the upper end of the dividing protrusion 23. The guide slope extends downward from the inner tube 21, so that the integral structure formed by the dividing protrusion 23 and the inner tube 21 gradually increases in size from top to bottom, making it easier to insert it into the outer tube 22.

[0028] In this embodiment of the invention, there are four dividing protrusions 23, which are arranged sequentially and at intervals along the circumferential wall of the inner tube 21. An independent oxygen-enriched distribution groove is formed between two adjacent dividing protrusions 23. This design can evenly distribute the oxygen-enriched air entering the annular cavity into each oxygen-enriched distribution groove, ensuring that the pressure and flow rate of the oxygen-enriched air remain stable during the flow process, and avoiding the impact on the combustion effect due to excessively high or low local oxygen-enriched air concentration.

[0029] In this embodiment of the invention, the width of the separating protrusion 23 in the circumferential direction along the annular cavity is greater than or equal to the height of the separating protrusion 23 in the radial direction along the annular cavity. By controlling the width-to-height ratio of the separating protrusion 23, the back pressure and airflow velocity can be balanced while ensuring the structural strength of the oxygen-enriched channel 111, allowing the oxygen-enriched air to enter the reaction zone in a more stable state. This effectively reduces component wear and extends the overall service life of the spray gun during long-term use.

[0030] Specifically, the ratio of the width of the dividing protrusion 23 in the circumferential direction along the annular cavity to its height in the radial direction along the annular cavity is greater than 5, so that the spray gun can maintain a good balance of back pressure and airflow velocity during movement. Furthermore, the ratio of the width of the dividing protrusion 23 in the circumferential direction along the annular cavity to its height in the radial direction along the annular cavity is greater than 6, to further improve the effect of back pressure control and suppressing airflow disturbance.

[0031] In this embodiment of the invention, the oxygen-enriched side-blowing spray gun further includes a second nozzle assembly 3, which is positioned between the spray gun base 1 and the first nozzle assembly 2. The second nozzle assembly 3 is detachably connected to both the spray gun base 1 and the first nozzle assembly 2, and includes a nested inner tube 21 and an outer tube 22. Thus, the nozzle of this invention is divided into two parts: the first nozzle assembly 2 and the second nozzle assembly 3. This modular design allows the first nozzle assembly 2 to be replaced individually according to different working conditions during use.

[0032] Specifically, the oxygen-enriched side-blown lance includes multiple length specifications of the first nozzle assembly 2. The length of the first nozzle assembly 2 can be flexibly selected according to the different properties of the smelting materials, reaction temperature, and oxygen flow requirements. This modular replacement method based on operating conditions not only reduces the overall maintenance cost of the equipment and avoids replacing the entire nozzle due to the failure of a single component, but also significantly shortens the adjustment cycle of the lance and enhances the adaptability of the oxygen-enriched side-blown furnace in different smelting processes.

[0033] Furthermore, the inner tubes 21 of the first nozzle assembly 2 and the second nozzle assembly 3, and the outer tubes 22 of the first nozzle assembly 2 and the second nozzle assembly 3 are threadedly connected in a one-to-one correspondence.

[0034] In this embodiment of the invention, the fuel channel 121 is arranged in a tapering manner along the feeding direction. This tapering design allows the fuel to form a high-speed jet within the channel, enhancing the mixing effect of fuel and oxygen and improving combustion efficiency. At the same time, the tapering structure can reduce pressure loss of fuel during flow, ensuring that the fuel enters the reaction zone with a stable flow rate and pressure, thereby guaranteeing the uniformity and stability of the smelting reaction.

[0035] In this embodiment of the invention, the inclination angle of the peripheral wall of the fuel channel 121 relative to the central axis of the fuel channel 121 is set to 11.5°~12.5°. This ensures that the fuel obtains sufficient acceleration within the channel to form a high-speed jet, while avoiding a sharp increase in fuel flow resistance or the generation of local eddies due to an excessively large inclination angle.

[0036] In this embodiment of the invention, a first flange 15 is formed at the end of the spray gun base 1 facing away from the fuel connection part 12. A stepped surface is formed on the inner side of the first flange 15. The first nozzle assembly 2 also includes a second flange on the outer wall of the outer tube 22. The second flange is embedded in the first flange 15 and seals against the stepped surface. This stepped design can form a multi-layer sealing surface. Through the tight fit between the second flange and the stepped surface, leakage of high-temperature and high-pressure gas inside the spray gun is effectively prevented, significantly improving the overall sealing performance and safety of the spray gun. In addition, the embedded structure of the flange facilitates the quick assembly and disassembly of the various components of the spray gun, saving a lot of operation time and improving work efficiency during equipment maintenance or component replacement.

[0037] In this embodiment of the invention, the spray gun base 1 includes a first base 13 and a second base 14. The first base 13 forms a fuel channel 121. The two ends of the second base 14 are respectively connected to the first base 13 and the outer tube 22. The second base 14 forms a fuel channel 121 surrounding the inner tube 21. An oxygen-enriched connecting part 11 connects to the second base 14, and a fuel connecting part 12 connects to the first base 13. The spray gun base 1 adopts a split-type structure design, which facilitates the separate processing of the fuel channel 121 and the oxygen-enriched channel 111 during manufacturing. When a component is worn or damaged, the corresponding connecting part can be replaced individually, effectively reducing maintenance costs. The oxygen-enriched channel 111 surrounds the inner tube 21 and communicates directly with the annular cavity, allowing oxygen-enriched gas to enter the annular cavity more stably from the oxygen-enriched channel 111.

[0038] In a specific embodiment of this utility model, the parameters of each structure in the oxygen-enriched side-blowing spray gun are selected as follows: Fuel channel 121: 14mm in diameter, 153.9mm² in cross-sectional area, the inclination angle of the channel's peripheral wall relative to the channel's central axis is set to 12°, and the channel's peripheral wall is mirror polished.

[0039] Oxygen-enriched channel 111: It is equipped with four dividing protrusions 23, each 0.5 mm high and 3 mm wide, with a cross-sectional area of ​​78.8 square millimeters.

[0040] Compared with existing spray guns, this spray gun effectively improves fuel combustion efficiency and significantly reduces the risk of production interruption caused by nozzle blockage, providing a reliable guarantee for the continuous and stable operation of the oxygen-enriched side-blown furnace.

[0041] To achieve the above objectives, a second aspect of this utility model provides an oxygen-enriched side-blowing furnace including the aforementioned oxygen-enriched side-blowing spray gun. Since the oxygen-enriched side-blowing furnace adopts all the technical solutions of the above embodiments, it at least has the aforementioned beneficial effects.

[0042] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A spray gun for oxygen-enriched side blowing, characterized in that, The oxygen-enriched side-blowing spray gun includes: The spray gun base (1) is provided with an oxygen-enriched connection part (11) and a fuel connection part (12), and an oxygen-enriched channel (111) and a fuel channel (121) are formed inside the spray gun base (1). First nozzle assembly (2), one end of the first nozzle assembly (2) is connected to the spray gun seat (1) and includes an inner tube (21) and an outer tube (22) nested together. The inner cavity of the inner tube (21) is connected to the fuel channel (121). An annular cavity is formed between the inner tube (21) and the outer tube (22). The annular cavity is connected to the oxygen-enriched channel (111). At least one of the inner tube (21) and the outer tube (22) has a dividing protrusion (23) protruding from the end of the annular cavity away from the spray gun seat (1). The number of dividing protrusions (23) is at least two. At least two dividing protrusions (23) are arranged sequentially at intervals along the circumferential direction of the annular cavity to divide the annular cavity into a plurality of jet ports (24). The cross-sectional area of ​​the jet nozzle (24) is set to 4 to 5 times the cross-sectional area of ​​the dividing protrusion (23), and the sum of the cross-sectional areas of all the jet nozzles (24) is set to 2 / 5 to 1 / 2 of the cross-sectional area of ​​the inner cavity of the inner tube body (21).

2. The oxygen-enriched side-blowing spray gun according to claim 1, characterized in that, At least two of the aforementioned dividing protrusions (23) are provided on the inner tube body (21).

3. The oxygen-enriched side-blowing spray gun according to claim 2, characterized in that, The number of the dividing protrusions (23) is four, and the four dividing protrusions (23) are arranged at intervals along the periphery of the inner tube (21).

4. The oxygen-enriched side-blowing spray gun according to claim 1, characterized in that, The width of the dividing protrusion (23) in the circumferential direction along the annular cavity is greater than or equal to the height of the dividing protrusion (23) in the radial direction along the annular cavity.

5. The oxygen-enriched side-blowing spray gun according to claim 4, characterized in that, The ratio of the width of the dividing protrusion (23) in the circumferential direction along the annular cavity to the height of the dividing protrusion (23) in the radial direction along the annular cavity is greater than 6.

6. The oxygen-enriched side-blowing spray gun according to claim 1, characterized in that, The oxygen-enriched side-blowing spray gun also includes a second nozzle assembly (3), which is placed between the spray gun base (1) and the first nozzle assembly (2). The second nozzle assembly (3) is detachably connected to the spray gun base (1) and the first nozzle assembly (2), and includes an inner tube (21) and an outer tube (22) nested together.

7. The oxygen-enriched side-blowing spray gun according to claim 1, characterized in that, The fuel passage (121) is arranged in a tapering manner along the feed direction.

8. The oxygen-enriched side-blowing spray gun according to claim 7, characterized in that, The inclination angle of the peripheral wall of the fuel channel (121) relative to the central axis of the fuel channel (121) is set to 11.5°~12.5°.

9. The oxygen-enriched side-blowing spray gun according to claim 1, characterized in that, The nozzle base (1) has a first flange (15) formed at one end opposite to the fuel connection (12). The inner side of the first flange (15) has a stepped surface. The first nozzle assembly (2) also includes a second flange provided on the outer wall of the outer tube (22). The second flange is embedded in the first flange (15) and sealed against the stepped surface.

10. An oxygen-enriched side-blown furnace, characterized in that, The oxygen-enriched side-blown furnace includes an oxygen-enriched side-blown spray gun according to any one of claims 1 to 9.

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