Spray gun of side-blown converter

Abstract

The utility model discloses a spray gun of a side-blown converter. The spray gun comprises an air nozzle and an oxygen lance, the tuyere is connected with the oxygen lance through a positioning sleeve, the positioning sleeve is detachably and fixedly connected with the tuyere, and the positioning sleeve is detachably and fixedly connected with the oxygen lance. According to the combined spray gun, the tuyere and the oxygen lance are detachably connected, so that when the lance core of the oxygen lance is damaged, the tuyere and the oxygen lance can be quickly and conveniently separated, and the function switching of the oxygen lance and the tuyere or the replacement of the lance core can be completed.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical engineering, and particularly relates to a side-blowing furnace spray gun. Background Art

[0002] In 1968, Soviet heavy nonferrous metallurgy expert Vanukov developed the Vanukov furnace, also known as the side-blown furnace. A tuyeres or spray guns are installed on the side walls of the side-blown furnace to blow oxygen-enriched air or fuel into the molten metal or slag melt in the side-blown furnace. The materials above the molten pool are subjected to strong disturbances such as oxygen-enriched air and are quickly immersed in the melt, completing the physical and chemical reactions quickly. It has high smelting intensity and low energy consumption and is widely used in the smelting of heavy nonferrous metals such as copper, lead, zinc, and nickel. After years of development, it has developed into an important nonferrous smelting furnace equipment.

[0003] The tuyere and spray gun are the core components of the side-blown furnace. Their function is to blow oxygen-enriched air, fuel, or fuel and oxygen into the side-blown furnace. There are two main categories at present. One is the tuyere that only blows in oxygen-enriched air, and the other is the spray gun that blows in fuel or fuel and oxygen. The tuyere and spray gun are installed in the melt layer of the side-blown furnace. When the spray gun is damaged or needs to be replaced, in order to prevent the high-temperature melt from flowing back into the tuyere or spray gun, it is usually necessary to lower the high-temperature melt level to below the installation port of the tuyere or spray gun before replacement. Not only does the replacement time take a long time, but it will also cause the side-blown furnace to stop production, keep warm, or even stop. The air outlet of the tuyere and spray gun is in contact with the high-temperature melt for a long time and is easily damaged, especially the spray gun core, which is an important factor affecting the continuous and stable production of the side-blown furnace. How to achieve stable production and gun replacement is particularly important.

[0004] my country has a huge stock of side-blown furnace production lines, and a large number of early side-blown furnaces are coal-fired furnaces with only one tuyere left. Energy conservation and carbon reduction in metallurgical furnace equipment have attracted much attention. On the one hand, there is the development of high-efficiency energy-saving furnaces, and on the other hand, there is the energy-saving transformation of existing furnaces. Both urgently need new spray guns. Utility Model Content

[0005] The utility model aims to provide a spray gun for a side-blowing furnace to solve the technical problem of inconvenient replacement of the spray gun.

[0006] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0007] A side-blown furnace spray gun comprises a tuyere and an oxygen lance, wherein the tuyere and the oxygen lance are connected via a positioning sleeve, the positioning sleeve is detachably fixedly connected to the tuyere, and the positioning sleeve is detachably fixedly connected to the oxygen lance.

[0008] Therefore, the tuyere of the utility model is connected to the oxygen gun via a positioning sleeve, and a detachable connection is adopted. When the gun core of the oxygen gun is damaged, the tuyere can be quickly and conveniently separated from the oxygen gun to complete the switching of the oxygen gun and tuyere functions or the replacement of the gun core.

[0009] Preferably, the positioning sleeve is connected to the air nozzle by threaded engagement, and the positioning sleeve is connected to the oxygen gun by a snap-fit ​​connection.

[0010] Furthermore, the air nozzle is provided with an air nozzle branch pipe and a blocking ball for closing the air inlet at one end close to the positioning sleeve.

[0011] Furthermore, one end of the tuyere is connected to the oxygen lance, and the other end of the tuyere is connected to the tuyere water jacket.

[0012] Furthermore, one end of the oxygen lance is connected to the tuyere, and the other end of the oxygen lance is connected to the combustion-supporting gas pipe through a connecting flange.

[0013] Furthermore, a gun core is provided in the oxygen gun, the gun core passes through the tuyere and the oxygen gun, and a first sealing member is provided between the gun core and the positioning sleeve.

[0014] Furthermore, the oxygen lance is provided with an oxygen lance pipe for connecting to a fuel gas pipe or a fluidized fuel pipe.

[0015] In addition, a pin is provided on the positioning sleeve, and a pin hole matching the pin is provided on the connecting end of the oxygen gun.

[0016] The utility model has the following advantages:

[0017] 1. The air nozzle and oxygen gun of the utility model adopt a detachable connection mode, which can quickly switch the spray gun function, avoiding the situation that the existing spray gun needs to stop production for insulation or even stop the furnace when replacing, and realizes the continuous and stable production of gun replacement; at the same time, the air nozzle can work independently, and the spray gun is more practical.

[0018] 2. The oxygen lance and the tuyere of the utility model are connected by a positioning sleeve, which is flexible and can be modified by using the existing tuyere to form a whole lance, which is beneficial to the modification of the existing furnaces. The modified furnaces can use natural gas, pulverized coal and other fuels instead of granular coal, and can realize the coal-to-gas conversion of coal-fired furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a side-blowing furnace spray gun of the utility model;

[0020] Figure 2 This is a schematic diagram of the oxygen lance structure of the utility model;

[0021] Figure 3 It is a schematic diagram of the positioning sleeve and the air nozzle structure of the utility model.

[0022] Explanation of marks in the figure: 1. Air inlet water jacket; 2. Air nozzle; 2-1. Air nozzle head; 2-2. Air nozzle branch pipe; 2-3. Sealing ball; 3. Positioning sleeve; 3-1. Pin; 4. Oxygen gun; 4-1. Gun core; 4-2. Gun seat; 4-3. Oxygen gun barrel; 4-4. Handle; 5. Connecting flange; 6. Second seal; 7. First seal; 8. Third seal; 9. Fourth seal; 10. Sight glass assembly. DETAILED DESCRIPTION

[0023] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1 and Figure 3 As shown, a side-blowing furnace lance of this embodiment includes a tuyere 2 and an oxygen lance 4, wherein the tuyere 2 and the oxygen lance 4 are connected via a positioning sleeve 3, wherein the positioning sleeve 3 is provided with a pin 3-1, and a pin hole matching the pin 3-1 is provided on the connecting end of the oxygen lance 4. Preferably, the positioning sleeve 3 is connected to the tuyere 2 via a threaded engagement.

[0025] Specifically, one end of the tuyere 2 is connected to the oxygen lance 4, and the other end of the tuyere 2 is connected to the tuyere water jacket 1. The connection between the tuyere 2 and the tuyere water jacket 1 is sealed by a third seal 8. One end of the oxygen lance 4 is connected to the tuyere 2, and the other end of the oxygen lance 4 is connected to the combustion-supporting gas pipe through a connecting flange 5. The connection between the oxygen lance 4 and the connecting flange 5 is sealed by a second seal 6. Figure 1 and Figure 2 As shown, the tuyere 2 is provided with a tuyere branch pipe 2-2 and a blocking ball 2-3 for closing the air inlet at one end close to the positioning sleeve 3. A gun core 4-1 is provided in the oxygen lance 4, and the gun core 4-1 penetrates the tuyere 2 and the oxygen lance 4, and a first sealing member 7 is provided between the gun core 4-1 and the positioning sleeve 3. The oxygen lance 4 is provided with an oxygen gun pipe 4-3 for connecting to a gas pipe or a fluidized fuel pipe.

[0026] As a preferred embodiment of the utility model, the tuyere 2 is a three-way pipe structure, the central tube is a cylindrical through hole, one end is an air inlet, and the other end is an air outlet. The air inlet end is connected to the oxygen gun 4 through a positioning sleeve 3, and the air outlet end is connected to the tuyere water jacket 1 of the side-blown furnace through a tuyere head 2-1. A tuyere branch pipe 2-2 and a blocking ball 2-3 are also provided at the air inlet end. A flange is provided at the entrance of the tuyere branch pipe 2-2 for external pipe connection, and the blocking ball 2-3 can connect or close the air inlet by moving up and down. The tuyere head 2-1 is conical, separated from the central tube of the tuyere 2, the large end is connected to the tuyere 2 through a flange and bolts, and the small end passes through the tuyere water jacket 1 of the side-blown furnace and is inserted into the side-blown furnace.

[0027] As another preferred embodiment of the utility model, the oxygen gun 4 is a three-way pipe structure, the gun core 4-1 passes through the positioning sleeve 3, and passes through the central tube and the tuyere head 2-1 from the air inlet of the tuyere 2, and is inserted into the side-blowing furnace, and the other end is inserted into the connecting flange 5. An oxygen gun barrel 4-3 and a handle 4-4 are provided on the gun seat on the side of the connecting flange 5, and a flange is provided at the inlet of the oxygen gun barrel 4-3 for external pipe connection.

[0028] In this embodiment, the tuyere 2, the positioning sleeve 3, the oxygen lance 4, and the connecting flange 5 are connected to form a spray gun of the side-blowing furnace, which has a total of one air outlet and three air inlets. The air outlet is inserted into the side-blowing furnace, and the three air inlets are connected to the external pipeline through the flange. When the oxygen lance 4 is inserted into the tuyere 2, the blocking ball 2-3 is in the upper position, the valve on the external pipeline of the tuyere branch pipe 2-2 is closed, the valve on the oxygen lance pipe 4-3 and the external pipeline of the connecting flange 5 is opened, and the oxygen lance 4 works. When the oxygen lance 4 is pulled out, the blocking ball 2-3 is in the lower position, the air inlet of the tuyere 2 is closed, the valve on the external pipeline of the tuyere branch pipe 2-2 is opened, and the tuyere 2 works.

[0029] Preferably, the central tube of the tuyere 2 is concentric with the gun core 4 - 1 of the oxygen gun 4 and the central tube of the positioning sleeve 3 , and a gap is left, so that the gun core 4 - 1 can freely cooperate with the tuyere.

[0030] Preferably, the tuyere 2, the positioning sleeve 3 and the oxygen gun 4 are separate structures, and all three are sealed by a seal. Specifically, the tuyere head 2-1 and the central tube of the tuyere 2 are sealed by a third seal 8. Thus, the parts of the spray gun are detachable, and the internal gas path of the spray gun is sealed after assembly.

[0031] Preferably, a pin 3-1 is provided on the outer wall of the tube body at the front end of the positioning sleeve 3, and a pin hole is provided on the outer wall of the gun seat 4-2 at the position corresponding to the pin 3-1. When the oxygen gun 4 is connected to the positioning sleeve 3, the handle 4-4 on the gun seat 4-2 is rotated, and the pin 3-1 cooperates with the pin hole on the outer wall of the gun seat 4-2 to fix the oxygen gun and the positioning sleeve 3. Furthermore, the number of the pin holes on the outer wall of the pin 3-1 and the gun seat 4-2 is the same, and is not less than 2 groups. Preferably, the number of the pin holes on the outer wall of the pin 3-1 and the gun seat 4-2 is 2 to 4 groups, and they are symmetrically arranged. Further, four evenly distributed pins 3-1 are provided on the outer wall of the tube body of the positioning sleeve 3, and four evenly distributed pin holes are provided on the outer wall of the gun seat 4-2, and the positions of the pin holes match the pins 3-1 on the outer wall of the tube body of the positioning sleeve 3.

[0032] Furthermore, the three air inlet external pipes of the spray gun need to be connected to a hose, and the length of the hose is not less than 2.5 times the total length of the spray gun. Preferably, the hose is a stainless steel hose.

[0033] Furthermore, the length of the gun core 4-1 inserted into the side-blowing furnace is not less than the length of the tuyere head 2-1 inserted into the side-blowing furnace. Preferably, the length of the gun core 4-1 inserted into the side-blowing furnace is 1 to 10 mm longer than the length of the tuyere head 2-1 inserted into the side-blowing furnace.

[0034] Further, the nozzle branch pipe 2-2 is connected to the combustion-supporting gas pipe. Preferably, the oxygen gun pipe 4-3 is connected to the fuel gas or fluidized fuel pipe, and the connecting flange 5 is connected to the combustion-supporting gas pipe.

[0035] Preferably, the positioning sleeve 3 is connected to the air nozzle 2 by threaded engagement.

[0036] Preferably, after the oxygen lance 4 is separated from the tuyere 2, it can be sealed by a sight glass assembly to form an oxygen-free lance structure. Preferably, when the gas or fluidized fuel is not passed for a long time, the oxygen lance should be pulled out and sealed by a sight glass assembly.

[0037] Preferably, the central tube of the tuyere 2 of this embodiment is concentric with the gun core 4-1 of the oxygen gun 4 and the central tube of the positioning sleeve 3, and the gap is 0-1mm. The total length of the spray gun is 960mm, and the three air inlets are connected to a 2.5m stainless steel hose. The tuyere branch pipe 2-2 is connected to the oxygen-enriched compressed air pipe, the oxygen gun pipe 4-3 is connected to the natural gas pipe, and the connecting flange 5 is connected to the oxygen pipe.

[0038] The technical principle of this embodiment is as follows:

[0039] The tuyere and oxygen lance are designed as a connected and separated structure, that is, a spray gun shared by the tuyere and oxygen lance is formed. When the gun core of the oxygen lance is damaged, the oxygen lance can be quickly pulled out, and the sealing ball inside the tuyere is used to close the oxygen lance channel. At the same time, protective gas is sprayed from the tuyere branch pipe to prevent high-temperature melt from backflowing into the tuyere and the tuyere from being blocked by slag due to lack of disturbance. The tuyere and oxygen lance are connected by a positioning sleeve, and the pin and pin hole are matched, which can be opened and locked quickly and conveniently to complete the switching of the oxygen lance and tuyere functions or the replacement of the gun core; the positioning sleeve and oxygen lance can be designed according to the existing tuyere, so that the single tuyere of the existing side-blown furnace can also be transformed into a spray gun with a tuyere and oxygen lance integrated through simple modification, realizing the energy-saving transformation of the existing coal-fired side-blown furnace from coal to gas.

[0040] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A side-blown furnace spray gun, characterized in that: The invention comprises a tuyere (2) and an oxygen lance (4), wherein the tuyere (2) and the oxygen lance (4) are connected via a positioning sleeve (3), the positioning sleeve (3) and the tuyere (2) are detachably fixedly connected, and the positioning sleeve (3) and the oxygen lance (4) are detachably fixedly connected; one end of the tuyere (2) is connected to the oxygen lance (4), and the other end of the tuyere (2) is connected to a tuyere water jacket (1); The air nozzle (2) is provided with an air nozzle branch pipe (2-2) and a sealing ball (2-3) for sealing the air inlet at one end close to the positioning sleeve (3); A gun core (4-1) is provided in the oxygen gun (4), the gun core (4-1) is arranged through the tuyere (2) and the oxygen gun (4), and a first sealing member (7) is provided between the gun core (4-1) and the positioning sleeve (3).

2. The side-blown furnace lance according to claim 1, characterized in that: The positioning sleeve (3) is connected to the air nozzle (2) via threaded engagement.

3. The side-blown furnace lance according to claim 1, characterized in that: The other end of the oxygen lance (4) is connected to the combustion-supporting gas pipe via a connecting flange (5).

4. The side-blown furnace lance according to claim 1, characterized in that: The oxygen lance (4) is provided with an oxygen lance pipe (4-3) for connecting to a fuel gas pipe or a fluidized fuel pipe.

5. The side-blown furnace lance according to claim 1, characterized in that: A pin (3-1) is provided on the front end of the positioning sleeve (3), and a pin hole matching the pin (3-1) is provided on the connecting end of the oxygen gun (4).

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