Spray gun device and side blowing furnace with same

Abstract

The utility model discloses a spray gun device and a side-blown converter with the spray gun device. The problems that an existing pulverized coal / sulfur spray gun for the side-blown converter is prone to being corroded in the using process, and the service life of the spray gun is shortened are solved. The furnace comprises a furnace body and a spray gun device, and the spray gun device comprises a feeding piece, a spraying piece and a spraying piece, the mixing chamber is provided with an air inlet cavity; one end of the spray gun inner pipe is communicated with the feeding opening, and the other end of the spray gun inner pipe is used for spraying out materials; the spray gun outer pipe is arranged on the outer side of the spray gun inner pipe in a sleeving mode and connected with the mixing chamber, the inner wall of the spray gun outer pipe and the outer wall of the spray gun inner pipe are matched with each other to form a gas channel, and the gas channel is communicated with the gas inlet cavity, enables gas and materials to be mixed at an outlet of the spray gun inner pipe and is used for providing power for the materials sprayed out of the spray gun inner pipe. The utility model has the advantages of simple structure, convenient assembly, reliable action, long service life and the like.

Description

Technical Field

[0001] This utility model relates to the field of non-ferrous metal smelting, specifically to a spray gun device and a side-blown furnace equipped with the spray gun device. Background Technology

[0002] Against the backdrop of sustainable development, the nickel industry needs to transform towards green and low-carbon directions. The side-blown furnace smelting technology for low-matte nickel provides a new way to achieve sustainable development of the nickel industry and helps to promote the green upgrading of the entire industry.

[0003] Side-blown furnace smelting mainly consists of a smelting zone reaction and a sulfidation zone reaction, in which oxygen-enriched air, sulfur, and pulverized coal play crucial roles. Melting zone reaction: The prepared materials are fed into the melting zone of the side-blown furnace through the top charging port. Oxygen-enriched air with an oxygen concentration of 60%-95% and a gauge pressure of 100 kPa is injected through tuyeres and lances in the melting zone. The tuyeres are positioned 0.4-0.8 m below the surface of the static melt. The injected oxygen-enriched air causes intense agitation of the melt within the furnace. The added materials, after falling into the agitated melt in the melting zone, are heated by the heat transfer from the high-temperature melt. The easily fusible components melt rapidly, forming metallic droplets in the slag. Other solvents, high-melting-point components, and coal undergo vigorous chemical reactions, supplying heat to the furnace and completing the slag-forming reaction. Sulfidation Zone Reaction: In the sulfidation zone, the metal oxides in the molten metal continue to react chemically with the pulverized coal and sulfur injected from the lance. The pulverized coal and the CO gas generated by its combustion reduce the metal oxides in the raw materials into molten metal droplets. These droplets continuously collide and grow, eventually settling to the bottom of the hearth and separating from the slag. In addition, there may be other side reactions and complex intermediate processes, but the reactions described above are the main chemical reactions involving pulverized coal and sulfur in the side-blown furnace smelting of low-grade nickel matte. They play a crucial role in achieving nickel reduction and sulfidation, and in the production of low-grade nickel matte.

[0004] Because the overall furnace temperature in the side-blown furnace for smelting low-grade nickel matte is at a high temperature, generally around 1200℃-1400℃, there are certain temperature differences in different areas due to different reactions. The melting zone has a relatively high temperature to provide heat for the rapid melting of raw materials and the initial reaction. The sulfidation zone and the slag-nickel separation device zone have relatively lower temperatures, but they are still kept within the range that allows the reaction to proceed smoothly. The temperature is adjusted by the amount of pulverized coal added and the amount of oxygen-enriched air supplied.

[0005] Because the nozzle head is located inside the high-temperature furnace, it is susceptible to high-temperature erosion and thermal stress, leading to burn-out, deformation, or even melting. Furthermore, sulfur is corrosive at high temperatures, especially in the presence of other impurities or moisture, which can corrode the inner wall and nozzle of the nozzle, shortening its service life and affecting its performance. This places high demands on the nozzle and its materials. Additionally, since the transported coal powder / sulfur is in the form of solid particles or contains solid impurities, high-speed passage through the nozzle can cause wear inside, altering the nozzle's channel dimensions and affecting the transport and spraying efficiency of the coal powder / sulfur. Inappropriate nozzle design, uneven wear, or segregation of coal powder / sulfur during transport can all result in uneven spraying of the coal powder / sulfur from the nozzle. Uneven coal powder distribution within the furnace can lead to uneven heat distribution, affecting smelting efficiency. If sulfur is not evenly dispersed within the furnace, it will affect the reaction efficiency and uniformity between sulfur and other materials. The atomization effect of oxygen-enriched air with pulverized coal / sulfur is poor. For example, some spray guns have uneven nozzle orifice distribution, resulting in uneven clumps of pulverized coal / sulfur being sprayed out instead of fine mist. This leads to incomplete reaction of raw materials, waste of raw materials, and a reduced yield of qualified products. Utility Model Content

[0006] To address the problem in the prior art that the head of the existing pulverized coal / sulfur spray gun for side-blown furnaces is easily corroded during use, thus shortening the service life of the spray gun, this utility model provides a spray gun device and a side-blown furnace equipped with the spray gun device.

[0007] The technical solution of this utility model is: a spray gun device, comprising:

[0008] A feeding component for material entry; the feeding component is provided with a feeding port for material entry;

[0009] A mixing chamber for gas entry; the mixing chamber is provided with an air inlet cavity.

[0010] The inner tube of the spray gun is located on the feed component. One end of the inner tube of the spray gun is connected to the feed port, and the other end is used for material spraying.

[0011] The outer tube of the spray gun is sleeved on the outside of the inner tube of the spray gun and connected to the mixing chamber. The inner wall of the outer tube and the outer wall of the inner tube of the spray gun cooperate to form a gas channel. The gas channel is connected to the air inlet chamber and at the outlet of the inner tube of the spray gun, the gas and the material are mixed and used to provide power for the material sprayed out of the inner tube of the spray gun.

[0012] As a further improvement of this utility model, it also includes a ceramic component for material flow, wherein the ceramic component is disposed on the inner wall of the inner tube of the spray gun.

[0013] As a further improvement of this utility model, it also includes blades, which are disposed on the outer wall of the outlet of the spray gun inner tube and are disposed in the gas channel.

[0014] As a further improvement of this utility model, the blade has multiple blades, which are circumferentially distributed on the outer wall of the spray gun inner tube outlet and divide the gas channel at the spray gun outer tube outlet into multiple spray chambers.

[0015] As a further improvement of this utility model, the blade is radially arranged in the gas channel and abuts against the inner wall of the outer tube of the spray gun.

[0016] As a further improvement of this utility model, the inner tube of the spray gun includes a first pipe and a second pipe, the blade is disposed on the first pipe, the first pipe and the second pipe are welded to form an integral structure, and the first pipe, the second pipe and the outer tube of the spray gun are integrally formed of 310S stainless steel.

[0017] As a further improvement of this utility model, the feed port of the feed component is designed to be open at one end and closed at the other end, and the feed port at the closed end is adapted to the inner tube of the spray gun.

[0018] As a further improvement of this utility model, the mixing chamber includes a base and a connecting pipe, the air inlet chamber is formed at the base, the outer tube of the spray gun is inserted into the base and connected to the base, and the gas passage is connected to the air inlet chamber; the inner tube of the spray gun passes through the air inlet chamber and is connected to the feed component.

[0019] As a further improvement of this utility model, it also includes a handle for easy operation, which is provided on the base; the base is provided with a snap-fit ​​groove and a notch groove, the notch groove and the snap-fit ​​groove are connected, and the base is rotated and fixed after being snapped in through the notch groove.

[0020] A side-blown furnace includes a furnace body and the aforementioned spray gun device, wherein the outer tube and inner tube of the spray gun are inserted into the furnace body.

[0021] The beneficial effects of this utility model are that the design of an outer and inner nozzle of the spray gun allows for separate feeding of materials and gas, ensuring thorough mixing of the gas and material at the outlet. This results in a well-dispersed state of the material within the furnace, meeting the requirements of various processes within the kiln. Furthermore, the spray gun is less susceptible to high-temperature corrosion, leading to a long service life. This utility model also features a simple structure, convenient assembly, reliable operation, and long service life. Attached Figure Description

[0022] Appendix Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0023] Appendix Figure 2This is a cross-sectional structural diagram of an embodiment of the present utility model.

[0024] Appendix Figure 3 This is a schematic diagram of the structure of the spray gun inner tube in an embodiment of this utility model.

[0025] Appendix Figure 4 For the appendix Figure 3 A magnified structural diagram of point I in the middle.

[0026] Appendix Figure 5 This is a schematic diagram of the mixing chamber in an embodiment of the present invention.

[0027] In the diagram, 1 is the feed component; 11 is the feed inlet; 2 is the mixing chamber; 21 is the air inlet chamber; 22 is the base; 221 is the snap-fit ​​groove; 222 is the notch groove; 23 is the connecting pipe; 24 is the handle; 3 is the inner tube of the spray gun; 31 is the ceramic component; 32 is the blade; 33 is the first pipe; 34 is the second pipe; 4 is the outer tube of the spray gun; 41 is the gas passage; and 42 is the spray chamber. Detailed Implementation

[0028] The embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0029] Depend on Figure 1 Combination Figure 2-5 As shown, a side-blown furnace includes a furnace body and a spray gun device, wherein the spray gun device includes:

[0030] Feeding component 1 is used for material entry; the feeding component 1 is provided with a feed port 11 for material entry; a flange is usually installed on the feeding component, which is located at the rear end of the spray gun and connected to the coal powder / sulfur conveying pipeline, forming the channel for material to enter the spray gun. A flange interface is usually installed at the material inlet to ensure a tight connection with the conveying pipeline and prevent coal powder / sulfur leakage.

[0031] The mixing chamber 2 is used for gas entry; the mixing chamber 2 is provided with an air inlet chamber 21; the mixing chamber is mainly used to fix the outer pipe of the spray gun and to serve as the gas channel inlet.

[0032] The inner tube 3 of the spray gun is located on the feed member 1. One end of the inner tube 3 is connected to the feed port 11, and the other end is used for material spraying. The main function of the inner tube of the spray gun is to serve as a conveying channel for pulverized coal / sulfur. Pulverized coal / sulfur is conveyed from the material supply system to the front end of the spray gun (the outlet of the inner tube of the spray gun) through the inner tube of the spray gun so that it can be sprayed into the furnace.

[0033] The outer tube 4 of the spray gun is sleeved on the outside of the inner tube 3 of the spray gun and connected to the mixing chamber 2. The inner wall of the outer tube 4 and the outer wall of the inner tube 3 cooperate to form a gas channel 41. The gas channel 41 is connected to the air inlet chamber 21 and mixes the gas with the material at the outlet of the inner tube 3, providing power for the material sprayed from the inner tube 3. The outer tube 4 and the inner tube 3 of the spray gun are inserted into the furnace body. The outer tube of the spray gun is generally used to transport gases, such as oxygen-enriched air, compressed air, nitrogen, etc. These gases are mixed with coal powder / sulfur at the outlet of the spray gun to provide power for the material spraying, enabling the material to be sprayed into the furnace at a certain speed and angle. The beneficial effects of this utility model are that the outer tube and the inner tube of the spray gun allow the material and gas to be fed separately, and the gas and material are fully mixed at the outlet, so that the material forms a good dispersion state in the furnace, meeting the needs of various processes in the furnace. The spray gun is not easily corroded by high temperature, and the product has a long service life. This invention also features simple structure, convenient assembly, reliable operation, and long service life. Specifically, in processes such as side-blown furnace smelting, this product can be used for feeding materials such as pulverized coal / sulfur, acting as a pulverized coal / sulfur spray gun. This invention utilizes the power of a gaseous medium to transport pulverized coal / sulfur from the silo to the inner tube of the spray gun, and then sprays it into the furnace at a certain speed and angle through the nozzle (outlet of the inner tube). Simultaneously, oxygen-enriched air is transported to the nozzle position through the outer tube (gas channel). During this process, the gas and material are fully mixed at the nozzle position, ensuring good dispersion of the material within the furnace and meeting the requirements of various processes (such as smelting and heating) within the furnace. This invention employs a method of outer tube surrounding inner tube, with gas transported through the outer tube and material transported through the inner tube. The gas in the outer tube mixes with the pulverized coal / sulfur at the nozzle outlet, providing power for the material injection and enabling the material to be sprayed into the furnace at a certain speed and angle. Meanwhile, the gas supplied by the external pipe forms an air curtain around the nozzle outlet, which protects the nozzle and stabilizes the material jet. The air curtain prevents high-temperature flames and slag from flowing back into the nozzle, thus avoiding damage and extending its service life.

[0034] This utility model also includes a ceramic component 31 for material flow, which is disposed on the inner wall of the spray gun inner tube 3. The ceramic component lining the spray gun inner tube improves the wear resistance of the spray gun, thereby ensuring the conveying and spraying effect of coal powder / sulfur. The product is resistant to high temperature and has a long service life, preventing corrosion of the spray gun inner tube when the product is transporting materials in a high-temperature environment and preventing the spray gun from deforming.

[0035] This invention also includes blades 32, disposed on the outer wall of the outlet of the inner tube 3 of the spray gun, and the blades 32 are arranged within the gas channel 41. Specifically, there are multiple blades 32, which are evenly distributed circumferentially on the outer wall of the outlet of the inner tube 3 of the spray gun, dividing the gas channel 41 at the outlet of the outer tube 4 of the spray gun into multiple injection chambers 42. This facilitates the formation of injection chambers and provides power for material injection. The gas transported by the outer tube of the spray gun forms an air curtain around the outlet of the spray gun, which protects the spray gun and stabilizes the material injection flow. The air curtain can prevent high-temperature flames and slag from flowing back into the spray gun, avoiding damage to the spray gun and extending its service life.

[0036] The blades 32 are radially arranged within the gas channel 41 and abut against the inner wall of the outer tube 4 of the spray gun. This ensures the installation gap between the inner and outer tubes of the spray gun, provides support, and ensures the concentricity of the inner and outer tubes, facilitating uniform mixing of gas and materials.

[0037] The inner tube 3 of the spray gun includes a first pipe 33 and a second pipe 34. The blade 32 is disposed on the first pipe 33. The first pipe 33 and the second pipe 34 are welded to form an integral structure. The first pipe 33, the second pipe 34, and the outer tube 4 of the spray gun are integrally formed from 310S stainless steel. This design of the first and second pipes can save materials and avoid waste. 310S stainless steel is an austenitic chromium-nickel stainless steel with excellent oxidation resistance and corrosion resistance. Due to the high percentage of chromium and nickel, 310S has much better creep strength and can operate continuously at high temperatures. It has good high-temperature resistance, which ensures that the spray gun inserted into the side-blown furnace will not be damaged by high temperatures.

[0038] The feed inlet 11 of the feed component 1 is designed with one end open and the other end closed, and the closed end of the feed inlet 11 is adapted to the inner tube 3 of the spray gun. This increases the speed at which pulverized coal / sulfur material enters the spray gun. This makes it easier to control the spray angle and depth of the material entering the furnace.

[0039] The mixing chamber 2 includes a base 22 and a connecting pipe 23. The base 22 forms the air inlet chamber 21. The outer tube 4 of the spray gun is inserted into and connected to the base 22. The gas passage 41 communicates with the air inlet chamber 21. The inner tube 3 of the spray gun passes through the air inlet chamber 21 and connects to the feed component 1. Specifically, this invention also includes a handle 24 for easy operation. The handle 24 is located on the base 22. The base 22 has a snap-fit ​​groove 221 and a notch 222. The notch 222 communicates with the snap-fit ​​groove 221. The base 22 is locked in place by the notch 222 and rotated for installation and fixation. The snap-fit ​​groove and notch make spray gun installation and maintenance more convenient, allowing for quick assembly and disassembly of the spray gun. The handle design allows operators to hold the handle and operate the spray gun stably and quickly, ensuring the spray gun maintains the correct direction and position during use.

[0040] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation 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.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0042] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the inventive concept of this utility model is not limited to this utility model. Any modification that utilizes the inventive concept will be included within the scope of protection of this utility model patent.

Claims

1. A lance device, characterized by: It comprises: a feeding piece (1) for material entering; the feeding piece (1) is provided with a feeding port (11) for material entering; a mixing chamber (2) for gas entering; the mixing chamber (2) is provided with an air inlet cavity (21); a spray gun inner tube (3) arranged on the feeding piece (1), one end of the spray gun inner tube (3) is communicated with the feeding port (11), and the other end is used for material spraying; a spray gun outer tube (4) arranged outside the spray gun inner tube (3) and connected with the mixing chamber (2), the inner wall of the spray gun outer tube (4) and the outer wall of the spray gun inner tube (3) are matched to form a gas passage (41), the gas passage (41) is communicated with the air inlet cavity (21) and makes the gas mixed with the material at the outlet of the spray gun inner tube (3) and provides power for the material sprayed by the spray gun inner tube (3).

2. The lance apparatus of claim 1, wherein It further comprises a ceramic piece (31) for material flow, the ceramic piece (31) is arranged on the inner wall of the spray gun inner tube (3).

3. The lance apparatus of claim 1, wherein It further comprises a blade (32) arranged on the outer wall at the outlet of the spray gun inner tube (3), the blade (32) is arranged in the gas passage (41).

4. The lance apparatus of claim 3, wherein The blade (32) has multiple blades, the blades (32) are circumferentially distributed on the outer wall at the outlet of the spray gun inner tube (3) and separate the gas passage (41) at the outlet of the spray gun outer tube (4) into multiple spray cavities (42).

5. The lance apparatus of claim 3, wherein The blade (32) is radially arranged in the gas passage (41) and abuts against the inner wall of the spray gun outer tube (4).

6. The lance apparatus of claim 3, wherein The spray gun inner tube (3) comprises a first pipe (33) and a second pipe (34), the blade (32) is arranged on the first pipe (33), the first pipe (33) and the second pipe (34) are integrally formed by welding, and the first pipe (33), the second pipe (34) and the spray gun outer tube (4) are integrally formed by 310S stainless steel.

7. The lance apparatus of claim 1, wherein The feeding port (11) of the feeding piece (1) is arranged in a manner that one end is opened and the other end is contracted, and the feeding port (11) at the contracted end is matched with the spray gun inner tube (3).

8. The lance apparatus of claim 1, wherein The mixing chamber (2) comprises a seat body (22) and a connecting pipe (23), the air inlet cavity (21) is formed at the seat body (22), the spray gun outer tube (4) is inserted into the seat body (22) and connected with the seat body (22), and the gas passage (41) is communicated with the air inlet cavity (21); the spray gun inner tube (3) passes through the air inlet cavity (21) and is connected with the feeding piece (1).

9. The lance apparatus of claim 8, wherein It further comprises a handle (24) for facilitating operation, the handle (24) is arranged on the seat body (22); the seat body (22) is provided with a buckle groove (221) and a notch groove (222), the notch groove (222) is communicated with the buckle groove (221), and the seat body (22) is fixed by being clamped at the notch groove (222) and then being rotated and installed.

10. A side-blown furnace, characterized by: It comprises a furnace body and a spray gun device according to any one of claims 1-9, and the spray gun outer tube (4) and the spray gun inner tube (3) are inserted into the furnace body.

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