Dust removal device for vertical tank furnace in feeding process

Abstract

The dust removal device comprises an outer pipe and a plurality of layers of funnels arranged in an inner cavity of the outer pipe, the funnels are distributed in the axial direction of the outer pipe at intervals, the large ends of the funnels are arranged upwards, the small ends of the funnels are arranged downwards, and the large ends of the funnels are connected with the inner wall of the outer pipe in a sealed mode; in the direction from the upper end to the lower end of the outer pipe, the diameters of the small ends of the funnels are gradually increased, and the diameter of the small end of the uppermost funnel is not larger than that of a central pipe hole of the vertical tank furnace; and an outer exhaust port is formed in a part between the large ends of the two layers of funnels on the uppermost layer on the outer pipe. According to the utility model, the amount of dust escaped in the loading process can be greatly reduced, so that the power of the air exhaust fan is reduced, and the size of dust removal equipment is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of metallurgy and chemical production, and specifically relates to a dust removal device used in a vertical pot furnace during the charging process. Background Art

[0002] Vacuum vertical tank distillation furnaces are widely used in the reduction process of metals and the decomposition process of materials, such as vacuum vertical tank reduction furnaces for magnesium smelting, and vacuum reduction distillation of elements such as lead, zinc, and iron. The working process of the vertical tank furnace is to heat the material contained in the vertical tank through external heating, and then cause the hot material to undergo reduction, decomposition, metal vapor generation, volatilization, condensation and other reactions in the vertical tank. Since the vertical tank furnace is a device with a relatively large length-to-diameter ratio, such as the vacuum vertical tank furnace used in the magnesium smelting industry, the diameter is about 0.55m and the length is about 6m. The charging of the vertical tank furnace is generally done at the top. The pellet material is loaded into a hopper or a bell. The hopper filled with pellet material is placed on the vertical tank furnace. The unloading switch at the bottom of the hopper is turned on, and the pellet material in the hopper falls into the vertical tank furnace under the action of gravity. See the schematic diagram of the vertical tank furnace. Figure 1 When the vertical tank furnace is in a high temperature state, the air in the tank is heated, and the hot air will escape from the tank mouth. Because the vertical tank furnace has a relatively large length-diameter ratio, the hot air has a faster flow rate when escaping from the tank mouth, and the faster gas flow rate will bring the fine powder in the pellet material out of the vertical tank furnace, resulting in a large amount of dust brought into the workshop by the gas in the tank during the feeding process with a hopper or a bell. A large amount of dust affects the production environment.

[0003] In order to reduce the amount of dust discharged into the air during the charging process, the current method is to use a gas collecting hood to collect dust, that is, to place a gas collecting hood above the vertical tank and the hopper during the charging process, and use a large suction force to draw the hot gas with dust discharged from the tank into the gas collecting hood. The dust and hot gas drawn into the gas collecting hood are collected by the dust collecting system connected to the gas collecting hood to collect the dust in the gas. There are three problems with the existing dust collection method using a gas collecting hood: first, the gas collecting hood is placed on the upper part of the vertical tank furnace, which will hinder the crane from lifting the charging hopper, causing inconvenience in operation; second, because the flow rate of the hot gas is fast, in order to collect the escaping dust-containing gas as thoroughly as possible, it is necessary to equip the gas collecting stove with a large suction fan. The greater the suction force of the fan, the greater the power consumption required; third, the large suction force leads to an increase in the amount of gas drawn to the dust removal system, resulting in an increase in the subsequent dust removal equipment, which increases the equipment investment. Summary of the invention

[0004] In view of the above three problems existing in dust removal during the charging process of a vertical drum furnace, the purpose of the utility model is to provide a dust removal device for the vertical drum furnace during the charging process. The utility model can significantly reduce the amount of dust escaping during the charging process, thereby reducing the power of the exhaust fan and reducing the volume of the dust removal equipment.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A dust removal device for a vertical tank furnace during a charging process, comprising an outer tube and a plurality of layers of funnels arranged in an inner cavity of the outer tube, wherein the plurality of layers of funnels are spaced apart along the axis of the outer tube, the large end of the funnel faces upward and the small end faces downward, and the large end of the funnel is sealedly connected to the inner wall of the outer tube;

[0007] From the upper end to the lower end of the outer tube, the diameter of the small end of each layer of funnel gradually increases, and the diameter of the small end of the top funnel is not larger than the diameter of the central tube hole of the vertical tank furnace; an external exhaust port is provided on the outer tube between the large ends of the two top layers of funnels.

[0008] Preferably, a support is provided at the lower end of the inner cavity of the outer tube, and the support is located below the bottom funnel. The support is in the shape of a circular ring, and the outer edge of the support is sealed and connected to the inner wall of the outer tube. The inner diameter of the support is larger than the small end diameter of the bottom funnel and smaller than the outer diameter of the expanded part of the vertical tank furnace, and the inner diameter of the outer tube is not smaller than the outer diameter of the expanded part of the vertical tank furnace.

[0009] Preferably, the difference in diameter between the small ends of two adjacent layers of funnels is 2 to 3 cm.

[0010] Preferably, the plurality of layers of funnels are distributed at equal intervals along the axial direction of the outer tube.

[0011] Preferably, the spacing between two adjacent layers of funnels along the axial direction of the outer tube is 100 to 150 mm.

[0012] Preferably, the vertex angle of the cone corresponding to the funnel is in the range of 90° to 120°.

[0013] Preferably, the number of layers of the funnel is 3 to 6.

[0014] Preferably, the height of the outer tube is 500-600 mm.

[0015] Preferably, the distance between the large end of the uppermost funnel and the upper end surface of the outer tube is 80-100 mm.

[0016] Preferably, the external exhaust port is arranged close to the connection between the large end of the uppermost funnel and the outer tube.

[0017] The utility model has the following beneficial effects:

[0018] The utility model is used for a dust removal device in the process of charging a vertical pot furnace. When the vertical pot furnace is charged each time, the dust removal device of the utility model is placed on the top of the vertical pot furnace, and the external exhaust port is connected to the dust removal system with a hose; after the dust removal device of the utility model is placed on the top of the vertical pot furnace, the hot air in the vertical pot will first contact the bottom funnel, and a hot gas vortex will be formed in the narrow space formed between the bottom funnel and the inner wall of the outer tube. Under the guidance of the funnel, the hot gas vortex will gradually diffuse from the inner wall of the outer tube to the opening of the funnel. At the opening of the funnel, the direction of the vortex collides with the airflow passing vertically through the opening of the funnel, so that the airflow speed passing vertically through the opening of the funnel is reduced. As the airflow rises higher, the funnel aperture decreases, resulting in a gradual decrease in the airflow rising channel, and most of the airflow will enter the narrow space formed by the upper end of the funnel and the inner wall of the outer tube on the side, and the vortex formed by the airflow will gradually increase, and the vortex will reduce the speed of the airflow. On the other hand, when the ball starts to fall from the top funnel, the ball and the airflow move in the opposite direction, blocking the channel for the airflow to flow upward, further reducing the speed of the airflow to flow upward. When the airflow enters the space between the two layers of funnels on the top layer, the airflow speed is already small, and the dust and ash can be discharged externally in the feeding process with a small suction force in this space. Therefore, the utility model is provided with an external exhaust port on the outer tube between the large ends of the two layers of funnels on the top layer. Third, the ball and the airflow can block the falling speed of the ball in the reverse movement, reduce the falling speed of the ball, and reduce the breakage of the ball. From the above, it can be seen that the utility model can reduce the falling speed of the ball, reduce the number of broken balls, reduce the power of the fan configured in the dust collection system, and reduce energy consumption. The dust removal device is mainly composed of an outer tube and several layers of funnels, without heavy solid parts, so the entire dust removal device is light and easy to move. It can be installed on the top of the vertical tank when feeding, which improves the convenience of feeding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of an existing vertical drum furnace;

[0020] FIG2(a) is a longitudinal sectional view of the dust removal device of the utility model used in the vertical tank furnace during the charging process; FIG2(b) is a bottom view of FIG2(a) (the support is not shown)

[0021] Figure 3 The utility model is a functional principle diagram of a dust removal device used in a vertical tank furnace during a charging process.

[0022] In the figure, 1-the expansion part of the vertical tank furnace, 2-the condenser, 3-the pellet material, 4-the center tube hole, 5-the center tube, 6-the discharge port, 7-the first funnel, 8-the external exhaust port, 9-the second layer funnel, 10-the third layer funnel, 11-the fourth layer funnel, 12-the support, 13-the pellet material, 14-the descending direction of the pellets, 15-the air flow swirl, 16-the rising air flow in the vertical tank, and 17-the external tube. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Reference Figure 2(a) to Figure 3 The utility model is used for a dust removal device in a vertical tank furnace during a charging process, comprising an outer tube 17 and a plurality of layers of funnels arranged in the inner cavity of the outer tube 17, wherein the plurality of layers of funnels are spaced apart along the axial direction of the outer tube 17, the large end of the funnel is arranged upward and the small end is arranged downward, and the large end of the funnel is sealed and connected to the inner wall of the outer tube 17; from the upper end to the lower end of the outer tube 17, the diameter of the small end of each layer of funnel gradually increases, and the diameter of the small end of the uppermost funnel is not larger than the diameter of the central tube hole 4 of the vertical tank furnace; an external exhaust port 8 is provided on the outer tube 17 between the large ends of the two uppermost layers of funnels.

[0025] The utility model is used for the dust removal device of the vertical tank furnace in the process of charging. Figure 1 The charging device is placed at the upper end of the vertical furnace expansion part 1 at the top of the vertical furnace, see Figure 3 , the hot air in the vertical tank will first contact the bottom funnel of the feeding device, and form a hot gas vortex in the narrow space formed between the bottom funnel and the inner wall of the outer tube 17. Under the guidance of the funnel, the hot gas vortex will gradually spread from the inner wall of the outer tube to the opening of the funnel. At the opening of the funnel, the direction of the vortex collides with the airflow passing vertically through the opening of the funnel, so that the airflow speed passing vertically through the opening of the funnel is reduced. As the airflow rises higher, the funnel aperture decreases, resulting in a gradual decrease in the airflow rising channel. Most of the airflow will enter the narrow space formed by the bottom of the funnel and the inner wall of the outer tube on the side. The vortex formed by the airflow will gradually increase, and the vortex will reduce the speed of the airflow, which is conducive to dust sedimentation. On the other hand, when the material ball begins to fall from the top hopper, the material ball and the airflow move in the opposite direction, blocking the channel for the airflow to flow upward, further reducing the speed of the airflow to flow upward. When the airflow enters the space between the first and second layers of the top funnel, the airflow speed is relatively small, and the dust-containing ash can be discharged in this space with a small suction force during the feeding process. Third, the ball and the airflow can block the descending speed of the ball in the reverse motion, reduce the descending speed of the ball, and reduce the breakage of the ball.

[0026] As a preferred embodiment of the above scheme, as shown in Figure 2 (a) and Figure 3As shown, a support 12 is provided at the lower end of the inner cavity of the outer tube 17. The support 12 is located below the bottom funnel. The support 12 is in the shape of a circular ring. The outer edge of the support 12 is sealed and connected to the inner wall of the outer tube 17. The inner diameter of the support 12 is larger than the small end diameter of the bottom funnel and smaller than the outer diameter of the vertical furnace expansion part 1. The inner diameter of the outer tube 17 is not smaller than the outer diameter of the vertical furnace expansion part 1. When the charging device is placed on the upper end of the vertical furnace expansion part 1 at the top of the vertical furnace, the lower end of the outer tube 17 is sleeved on the upper end of the vertical furnace expansion part 1. On the one hand, the support 12 provides vertical support for the entire charging device. On the other hand, the annular support 12 helps to form a hot gas vortex in the narrow space formed between the bottom funnel and the inner wall of the outer tube 17.

[0027] As a preferred embodiment of the above scheme, in the utility model, the difference between the diameters of the small ends of two adjacent layers of funnels is 2 to 3 cm, preferably 2 cm. Several layers of funnels are equally spaced along the axial direction of the outer tube 17. The spacing between two adjacent layers of funnels along the axial direction of the outer tube 17 is 100 to 150 mm, generally 100 mm, which can shorten the axial dimension of the outer tube 17 as much as possible. The vertex angle range of the cone corresponding to the funnel is 90° to 120°, generally 90°, at which time the angle between the generatrix of the funnel and the inner wall of the outer tube 17 is 45° to 60°. The number of layers of the funnel is 3 to 6 layers, and generally 4 layers of funnel are used. The height of the outer tube 17 is 500 to 600 mm, generally 500 mm. The distance between the large end of the top funnel and the upper end surface of the outer tube 17 is 80-100 mm, generally 80 mm. This distance enables a certain storage space to be provided between the large end of the uppermost funnel and the upper end surface of the outer tube 17, so that the material discharge is stable.

[0028] As a preferred embodiment of the above scheme, the external exhaust port 8 is arranged close to the connection between the large end of the uppermost funnel and the outer tube 17. Setting the external exhaust port 8 at this position can make the air flow velocity at the external exhaust port 8 as small as possible.

[0029] Example

[0030] This embodiment is used in the dust removal device of the vertical tank furnace during the charging process. The difference in diameter between the small ends of two adjacent layers of funnels is 2 cm, the spacing between the two adjacent layers of funnels along the axial direction of the outer tube 17 is 100 mm, and the vertex angle range of the cone corresponding to the funnel is 90°. At this time, the angle between the generatrix of the funnel and the inner wall of the outer tube 17 is 45°. The number of layers of the funnel is 4. The height of the outer tube 17 is 500 mm. The distance between the large end of the top funnel and the upper end surface of the outer tube 17 is 80 mm. The inner diameter of the outer tube 17 is the same as the outer diameter of the vertical tank furnace expansion part 1, and the outlet diameter of the top funnel is consistent with the outer diameter of the central tube 4 of the vertical tank furnace. The wall thickness of the outer tube 17 and the thickness of the support 12 are both 20 mm, and the inner radius of the support 12 is 30 mm smaller than the outer diameter of the central tube 4 of the vertical tank furnace.

[0031] The dust removal device used in the vertical tank furnace in the charging process of this embodiment is relatively small in size, relatively light in weight, and easy to move. Each time the material is charged, the external exhaust port of the charging and dust collector is connected to the dust removal system with a hose, and then the charging device is placed on the top of the vertical tank furnace, and the charging hopper filled with material balls is placed on the top of the charging and dust removal device. The discharge valve of the charging hopper is released, so that the pellets fall layer by layer from the top of the charging and dust removal device along the funnel distributed in the charging device under the action of gravity. The falling speed of the material balls is reduced, the number of broken material balls is reduced, the power of the fan configured in the dust collection system is reduced, and the energy consumption is reduced. The charging and dust removal device is small in size, light in weight, and easy to move. It can be installed on the top of the vertical tank during charging, which improves the convenience of the charging operation.

Claims

1. A dust removal device for a vertical tank furnace during the charging process, characterized in that: It comprises an outer tube (17) and a plurality of layers of funnels arranged in the inner cavity of the outer tube (17), wherein the plurality of layers of funnels are spaced apart along the axial direction of the outer tube (17), the large end of the funnel is arranged upward and the small end is arranged downward, and the large end of the funnel is sealedly connected to the inner wall of the outer tube (17); From the upper end to the lower end of the outer tube (17), the diameter of the small end of each layer of funnel gradually increases, and the diameter of the small end of the uppermost funnel is not larger than the diameter of the central tube hole (4) of the vertical tank furnace; an external exhaust port (8) is provided on the outer tube (17) between the large ends of the two uppermost layers of funnel.

2. A dust removal device for a vertical furnace during charging according to claim 1, characterized in that: A support (12) is provided at the lower end of the inner cavity of the outer tube (17). The support (12) is located below the bottom funnel. The support (12) is in the shape of a circular ring. The outer edge of the support (12) is sealedly connected to the inner wall of the outer tube (17). The inner diameter of the support (12) is larger than the small end diameter of the bottom funnel and smaller than the outer diameter of the vertical furnace expansion part (1). The inner diameter of the outer tube (17) is not smaller than the outer diameter of the vertical furnace expansion part (1).

3. The dust removal device for a vertical furnace during charging according to claim 1, characterized in that: The difference in diameter between the small ends of two adjacent layers of funnels is 2 to 3 cm.

4. The dust removal device for a vertical furnace during charging according to claim 1, characterized in that: The plurality of layers of funnels are distributed at equal intervals along the axial direction of the outer tube (17).

5. A dust removal device for a vertical furnace during charging according to claim 4, characterized in that: The distance between two adjacent layers of funnels along the axial direction of the outer tube (17) is 100 to 150 mm.

6. The dust removal device for a vertical furnace during charging according to claim 1, characterized in that: The vertex angle of the cone corresponding to the funnel ranges from 90° to 120°.

7. The dust removal device for a vertical furnace during charging according to claim 1, characterized in that: The number of layers of the funnel is 3 to 6.

8. The dust removal device for a vertical furnace during charging according to claim 1, characterized in that: The height of the outer tube (17) is 500-600 mm.

9. The dust removal device for a vertical furnace during charging according to claim 1, characterized in that: The distance between the large end of the uppermost funnel and the upper end surface of the outer tube (17) is 80-100 mm.

10. The dust removal device for a vertical furnace during charging according to claim 1, characterized in that: The external exhaust port (8) is arranged near the connection between the large end of the uppermost funnel and the outer tube (17).

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