A feed device for a metallurgical smelting furnace

Abstract

This utility model proposes a feeding device for a metallurgical smelting furnace, comprising: a feeding hopper, an airlock pipe, and a connecting pipe. The feeding hopper is connected to the upper part of the connecting pipe via the airlock pipe. The lower part of the connecting pipe is fixed to the upper part of the furnace top cover and is connected to the inner cavity of the furnace. The airlock pipe includes an inner pipe and an outer pipe, with the outer pipe coaxially fitted around the outer circumference of the inner pipe and both ends of the outer pipe sealed. The inner and outer pipes form an annular cavity. An air inlet pipe is provided on the side wall of the outer pipe, communicating with the annular cavity. An air outlet is provided on the side of the annular cavity near the connecting pipe, and the annular cavity is connected to the interior of the connecting pipe through the air outlet. This utility model forms a downward pressure air screen by creating an annular cavity within the airlock pipe. After high-pressure air is introduced into the annular cavity, the airflow is led out through the air outlet and blown towards the connecting pipe, thereby suppressing the escape of flue gas from the furnace inlet, reducing the load on the negative pressure fan, and extending the service life of the negative pressure fan.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical smelting furnace technology, and in particular to a feeding device for a metallurgical smelting furnace. Background Technology

[0002] In the smelting of non-ferrous metals such as copper, a smelting furnace is required to smelt various raw materials. Existing smelting furnaces have multiple feed inlets on the top. Raw materials are fed into the smelting furnace through the feed inlets via a conveying system. To prevent flue gas and dust from drifting out of the feed inlets during feeding, existing smelting furnaces typically draw air from the furnace through ducts to create a negative pressure inside. However, when using negative pressure dust suppression, the airflow drawn by the negative pressure fan still needs to be filtered and ash removed before being discharged to avoid dust affecting the fan's operation. During filtration, dust accumulates in the passageway, requiring regular cleaning. Furthermore, since the smelting furnace has multiple openings, when air is directly drawn from the furnace, multiple openings simultaneously draw air in, requiring the negative pressure fan to maintain sufficient airflow to ensure the furnace's stability. Continuous high airflow will reduce the lifespan of the negative pressure fan and filtration equipment. Therefore, a feeding device for a metallurgical smelting furnace is needed, which has multiple inward air outlets inside, so that the airflow is ejected in the feeding device to form a downward pressure air screen, thereby suppressing the escape of flue gas from the furnace through the feeding port and reducing the dependence on negative pressure fans. Utility Model Content

[0003] To address the aforementioned issues, this invention proposes a feeding device for a metallurgical smelting furnace, which has multiple inward-facing air outlets inside. This allows the airflow to be ejected within the feeding device, forming a downward-pressure air screen, thereby suppressing the escape of flue gas from the furnace through the feeding inlet and reducing reliance on negative pressure fans.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model proposes a feeding device for a metallurgical smelting furnace, comprising: a feeding hopper, an airlock pipe, and a connecting pipe. The feeding hopper is connected to the upper part of the connecting pipe via the airlock pipe. The lower part of the connecting pipe is fixed to the upper part of the furnace top cover and is connected to the inner cavity of the furnace. The airlock pipe includes an inner pipe and an outer pipe. The outer pipe is coaxially fitted around the outer circumference of the inner pipe and is sealed at both ends. The inner pipe and the outer pipe form an annular cavity. An air inlet pipe is provided on the side wall of the outer pipe and communicates with the annular cavity. An air outlet is provided on the side of the annular cavity near the connecting pipe, and the annular cavity is connected to the inside of the connecting pipe through the air outlet.

[0006] Furthermore, the inner tube is provided with a first flange plate and a second flange plate at both ends, one end of the outer tube is connected to the first flange plate, and the other end of the outer tube is connected to the second flange plate or connected to the inner tube through a baffle.

[0007] Furthermore, there are multiple air vents, which are arranged in a ring array on the first flange plate.

[0008] Furthermore, the outlet end of the air vent is inclined toward the axis of the connecting pipe at an angle of 20° to 40°.

[0009] Furthermore, the inner tube is connected to the connecting pipe and the feed hopper respectively through the first flange plate and the second flange plate, and an asbestos gasket is provided at the connection.

[0010] Furthermore, the connecting pipe is connected to a high-pressure gas source via an air pipe.

[0011] The beneficial effects of this utility model are as follows: by forming an annular cavity in the airlock pipe, high-pressure air is introduced into the annular cavity and then the airflow is led out through the air outlet and blown towards the connecting pipe, thereby forming a downward pressure air screen, which suppresses the escape of flue gas from the feed port in the furnace, reduces the load on the negative pressure fan, and extends the service life of the negative pressure fan. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 2

[0013] Figure 2 This is a schematic diagram of the structure of the airlock pipe of this utility model. Figure 2

[0014] Figure 3 This is a schematic diagram of the air outlet structure of this utility model. Figure 2

[0015] Figure 4 This is a schematic diagram of the internal structure of the airlock tube of this utility model. Figure 2

[0016] In the diagram: 1-Feed hopper, 2-Air lock pipe, 3-Connecting pipe, 4-Inner pipe, 5-Outer pipe, 6-Annular cavity, 7-Air inlet pipe, 8-Air outlet, 9-First flange plate, 10-Second flange plate, 11-Baffle, 12-Air pipe. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0019] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of the stated features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0020] like Figures 1 to 4 As shown, an embodiment of this utility model provides a feeding device for a metallurgical smelting furnace, including: a feeding hopper 1, an airlock pipe 2, and a connecting pipe 3. The feeding hopper 1 is connected to the upper part of the connecting pipe 3 through the airlock pipe 2. The lower part of the connecting pipe 3 is fixed to the upper part of the top cover of the smelting furnace, and the connecting pipe 3 is connected to the inner cavity of the smelting furnace. The airlock pipe 2 includes an inner pipe 4 and an outer pipe 5. The outer pipe 5 is coaxially fitted around the outer circumference of the inner pipe 4, and both ends of the outer pipe 5 are sealed. The inner pipe 4 and the outer pipe 5 form an annular cavity 6. An air inlet pipe 7 is provided on the side wall of the outer pipe 5, and the air inlet pipe 7 communicates with the annular cavity 6. An air outlet 8 is provided on the side of the annular cavity 6 near the connecting pipe 3, and the annular cavity 6 is connected to the inside of the connecting pipe 3 through the air outlet 8.

[0021] When raw materials need to be added to the smelting furnace, the raw materials are sent to the feeding hopper 1 by a conveying device. Under the action of gravity, the metallurgical raw materials enter the feeding hopper 1 and fall into the smelting furnace after passing through the airlock pipe 2 and the connecting pipe 3. At this time, the flue gas and dust of the raw materials in the smelting furnace are easy to drift outward from the feeding device. In order to suppress the flue gas, high-pressure air can be injected into the annular cavity 6 through the air pipe 12. Under the action of air pressure, the air will be sprayed out from the air outlet 8 at the bottom of the annular cavity 6 to the connecting pipe 3, thereby forming an air screen. Under the action of airflow inertia, the airflow will flow downward from the feeding hopper 1, thereby suppressing the flue gas in the furnace from drifting outward. At this time, the negative pressure fan connected to the smelting furnace only needs to operate at medium and low speed. Compared with the traditional method of forming negative pressure by sucking out the air in the furnace through the negative pressure fan, this device can effectively suppress the flue gas, reduce the load of the negative pressure fan, reduce the speed of dust accumulation in the pipeline, extend the cleaning interval, and improve the uptime.

[0022] Specifically, such as Figure 2 , Figure 4As shown, the inner tube 4 is provided with a first flange plate 9 and a second flange plate 10 at both ends. One end of the outer tube 5 is connected to the first flange plate 9, and the other end of the outer tube 5 is connected to the second flange plate 10 or connected to the inner tube 4 through the baffle 11. The annular cavity 6 can be formed by the first flange plate 9, the second flange plate 10, the inner tube 4, and the outer tube 5. When the inner tube 4 is long, it can also be formed by the first flange plate 9, the baffle 11, the inner tube 4, and the outer tube 5. The composition scheme of the annular cavity 6 can be formulated according to the equipment to be modified.

[0023] In a specific embodiment, such as Figure 3 As shown, there are multiple air outlets 8, which are arranged in a ring array on the first flange plate 9, so that the airflow can be evenly sprayed onto the connecting pipe 3, thereby forming a dense air screen. The airflow also drives the air in the feeding device to flow into the melting furnace, suppressing the dispersion of smoke and dust.

[0024] In a preferred embodiment, such as Figure 4 As shown, the outlet end of the air outlet 8 is inclined towards the axis of the connecting pipe 3 at an angle of 20° to 40°, so that the airflow is drawn towards the middle of the connecting pipe 3, preventing the smoke and dust from drifting outward from the middle of the connecting pipe 3.

[0025] Specifically, the inner pipe 4 is connected to the connecting pipe 3 and the feed hopper 1 respectively through the first flange plate 9 and the second flange plate 10, and an asbestos board gasket is provided at the connection. The asbestos board gasket has high heat resistance and can improve the airtightness to prevent smoke and dust from drifting out from the gaps at the connection.

[0026] In a preferred embodiment, the connecting pipe 3 is connected to a high-pressure air source through the air pipe 12. After the high-pressure air enters the annular cavity 6, it is ejected from the air outlet 8, forming a wind screen at the feeding position to suppress the dispersion of smoke and dust. This eliminates the need for the negative pressure fan of the smelting furnace to operate under heavy load, thus extending the service life of the equipment.

[0027] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A feeding device for a metallurgical smelting furnace, characterized in that, include: The feed hopper (1), the airlock pipe (2), and the connecting pipe (3) are provided. The feed hopper (1) is connected to the upper part of the connecting pipe (3) through the airlock pipe (2). The lower part of the connecting pipe (3) is fixed to the upper part of the top cover of the smelting furnace and is connected to the inner cavity of the smelting furnace. The airlock pipe (2) includes an inner pipe (4) and an outer pipe (5). The outer pipe (5) is coaxially fitted around the outer circumference of the inner pipe (4) and both ends of the outer pipe (5) are sealed. The inner pipe (4) and the outer pipe (5) form an annular cavity (6). An air inlet pipe (7) is provided on the side wall of the outer pipe (5) and is connected to the annular cavity (6). An air outlet (8) is provided on the side of the annular cavity (6) near the connecting pipe (3) and is connected to the inside of the connecting pipe (3) through the air outlet (8).

2. The feeding device for a metallurgical smelting furnace according to claim 1, characterized in that, The inner tube (4) is provided with a first flange plate (9) and a second flange plate (10) at both ends. One end of the outer tube (5) is connected to the first flange plate (9), and the other end of the outer tube (5) is connected to the second flange plate (10) or connected to the inner tube (4) through a baffle (11).

3. The feeding device for a metallurgical smelting furnace according to claim 2, characterized in that, There are multiple air vents (8), which are arranged in a ring array on the first flange plate (9).

4. The feeding device for a metallurgical smelting furnace according to claim 3, characterized in that, The air outlet (8) is inclined towards the axis of the connecting pipe (3) at an angle of 20° to 40°.

5. The feeding device for a metallurgical smelting furnace according to claim 2, characterized in that, The inner tube (4) is connected to the connecting pipe (3) and the feed hopper (1) respectively through the first flange plate (9) and the second flange plate (10), and an asbestos board sealing gasket is provided at the connection.

6. The feeding device for a metallurgical smelting furnace according to claim 1, characterized in that, The connecting pipe (3) is connected to a high-pressure gas source through the air pipe (12).

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