Dust removal device for blast furnace ash discharging system

Abstract

The utility model belongs to the technical field of blast furnace dust discharging and removing, and particularly discloses a dust removing device for a blast furnace dust discharging system, which comprises a large dust bin body, a bin body is arranged on one side of the large dust bin body, openings for mutual communication are arranged on the large dust bin body and the bin body, a transverse plate is arranged in the bin body, a plurality of through holes are arranged on the transverse plate, and the through holes are communicated with the large dust bin body. A through hole is formed in the bin body, a filter bag framework is clamped on the through hole, a dust removal filter bag is sleeved on the filter bag framework, a plurality of dust discharge cylinders are arranged at the top of the bin body, an induced draft fan is arranged in each dust discharge cylinder, and a blowing unit for blowing the dust removal filter bag is arranged on the bin body. The device aims at solving the problem that part of fine dust particles in a large ash warehouse drift into the air, and the personal health of operators is seriously affected. By arranging the bin body, the dust removal filter bag, the induced draft fan and other structures, dust drifting away from the large dust bin can be effectively collected and filtered, dust escaping in the air is reduced, and therefore the working environment is improved, and the personal health of operators is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace ash unloading and dust removal technology, specifically to a dust removal device for a blast furnace ash unloading system. Background Technology

[0002] In blast furnace ironmaking, dry baghouse dust collection systems are an important dust removal method, widely used due to their high efficiency and energy saving. It consists of multiple dust collector housings connected in parallel, and the entire dust removal system encompasses filtration, dust removal, ash discharge, and automatic control. The ash discharge system further processes the dust collected during the dust collection process, and its process flow is as follows: dust collector ash hopper → electric ash discharge ball valve → feeder → screw conveyor → bucket elevator → large ash silo → gate valve → humidifier → truck transport.

[0003] The large ash silo in the ash unloading system is a place for temporary storage of dust. During the ash unloading operation, the humidifier of the existing dust removal system is unevenly humidified, which causes the dust falling into the large ash silo to not be fully moistened. As a result, some dust particles are scattered into the air, which is not only difficult to collect, but also seriously affects the health of the workers. Utility Model Content

[0004] The purpose of this utility model is to provide a dust removal device for a blast furnace ash unloading system, in order to solve the problem that some fine dust particles in the large ash silo are scattered into the air, which is not only difficult to collect, but also seriously affects the health of the workers.

[0005] To achieve the above objectives, the basic solution provided by this utility model is as follows: a dust removal device for a blast furnace ash unloading system, comprising a large ash silo body, a silo body on one side of the large ash silo body, an opening for mutual communication between the large ash silo body and the silo body, a horizontal plate inside the silo body, a plurality of through holes on the horizontal plate, a filter bag frame snapped into the through holes, a dust removal filter bag fitted onto the filter bag frame, a plurality of dust discharge cylinders on the top of the silo body, an induced draft fan in each dust discharge cylinder, and a blowing unit for blowing the dust removal filter bags on the silo body.

[0006] The working principle of this invention is as follows: When the ash unloading system loads dust onto trucks, unhumidified dust particles are dispersed into the air. The induced draft fan inside the dust discharge cylinder is activated, creating negative pressure. Under this negative pressure, the dust in the air moves towards the dust collector filter bags. When the dust comes into contact with the filter bags, larger dust particles adhere to the surface of the filter bags, while finer dust particles pass through the filter bags. Under the suction of the induced draft fan, the dust particles pass through the through-holes on the horizontal plate and are discharged from the hopper through the dust discharge cylinder. As the dust removal operation continues, a large amount of larger dust particles gradually accumulate on the surface of the filter bags. At this point, the valve on the nitrogen main pipe is manually opened, and nitrogen gas enters the filter bag frame from the main pipe through the branch pipe. The nitrogen gas blows from the inside of the filter bags to the outside, and the nitrogen gas flow impacts the surface of the filter bags, blowing off the attached dust, causing it to fall to the bottom of the hopper. Finally, workers collect the fallen dust and load it onto trucks for transport.

[0007] The beneficial effects of this utility model are as follows: by setting up structures such as a silo body, dust filter bags, and induced draft fans, it is possible to effectively collect and filter the dust floating in the large ash silo, reduce the dust escaping into the air, thereby improving the working environment and protecting the health of the workers.

[0008] Option 2, a preferred option of the basic option, includes a nitrogen main pipe with a valve and several nitrogen branch pipes connected to it. One end of each nitrogen branch pipe extends into the chamber, and the outlet of the nitrogen branch pipe is located inside the filter bag frame. The diameter of the nitrogen branch pipe is smaller than the inner diameter of the filter bag frame. Using nitrogen for purging can effectively clean the dust adhering to the outside of the dust collector filter bag, causing the dust to fall to the ground.

[0009] Option 3, which is a preferred option of Option 2, uses a butterfly valve. Setting the valve as a butterfly valve makes it easier to adjust the flow rate of nitrogen, thereby precisely controlling the purging intensity.

[0010] Option 4, which is a preferred option of the basic option, is provided with a dust concentration sensor at the bottom of the horizontal plate. The dust concentration sensor is electrically connected to the control terminal of the induced draft fan. The dust concentration sensor and the induced draft fan are interlocked to realize the automatic adjustment of the induced draft fan speed. The dust extraction force is adjusted in real time according to the dust concentration in the chamber, which not only ensures the dust removal effect, but also avoids energy waste caused by the induced draft fan running for a long time.

[0011] Option 5, which is a preferred option of the basic option, is that the dust discharge hopper is equipped with a rain cover; by setting up the rain cover, rainwater can be prevented from entering the hopper and from damaging the induced draft fan.

[0012] Option 6, which is a preferred option of the basic option, has a sloping bottom with a slope of 10°. Setting the bottom of the silo to be sloping facilitates the collection and cleaning of dust, reduces the accumulation area of ​​dust at the bottom of the silo, reduces the difficulty of cleaning, and improves cleaning efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the large ash silo body and silo body in a dust removal device for a blast furnace ash unloading system according to this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of a dust removal device for a blast furnace ash unloading system according to this utility model;

[0015] Figure 3 for Figure 2 Sectional view at point AA;

[0016] Figure 4 This is a schematic diagram of the purging unit in a dust removal device for a blast furnace ash unloading system according to this utility model. Detailed Implementation

[0017] The present invention will be further described in detail below through specific embodiments:

[0018] The reference numerals in the accompanying drawings of the instruction manual include: 1. Large ash silo body; 2. Silo body; 3. Horizontal plate; 4. Filter bag frame; 5. Dust collector filter bag; 6. Dust discharge cylinder; 7. Exhaust fan; 8. Nitrogen main pipe; 9. Nitrogen branch pipe; 10. Valve; 11. Dust concentration sensor; 12. Rain cover.

[0019] like Figures 1 to 4The following is a dust removal device for a blast furnace ash unloading system: A large ash silo body 1 is included, with a silo body 2 welded to one side. Openings for interconnection are provided on both the ash silo body 1 and the silo body 2. The bottom of the silo body 2 is sloped at 10°. A horizontal plate 3 is provided inside the silo body 2, with several through holes. A filter bag frame 4 is snapped into each through hole. The diameter of the upper retaining ring of each filter bag frame 4 is larger than the inner diameter of the through hole, and the diameter of the lower retaining ring of each filter bag frame 4 is smaller than the inner diameter of the through hole. The upper retaining ring of the filter bag frame 4 is placed on the horizontal plate 3, and the filter bag frame 4 is located within the through hole. A dust removal device is fitted onto the filter bag frame 4. The dust filter bag 5 and the top of the chamber 2 are provided with several dust discharge cylinders 6. Each dust discharge cylinder 6 is equipped with an induced draft fan 7. A rain cover 12 is welded on the dust discharge cylinder 6. The chamber 2 is provided with a blowing unit for blowing the dust filter bag 5. The blowing unit includes a nitrogen main pipe 8. A valve 10 is provided on the nitrogen main pipe 8. The valve 10 is a butterfly valve. Several nitrogen branch pipes 9 are connected to the nitrogen main pipe 8. One end of each nitrogen branch pipe 9 extends into the chamber 2. The outlet end of the nitrogen branch pipe 9 is located inside the filter bag frame 4. The diameter of the nitrogen branch pipe 9 is smaller than the inner diameter of the filter bag frame 4. A dust concentration sensor 11 is provided at the bottom of the horizontal plate 3. It is electrically connected to the control terminal of the induced draft fan 7.

[0020] The implementation method of this embodiment is as follows: When the ash unloading system loads the dust onto the truck, the dust particles that have not been moistened are dispersed into the air. The dust concentration sensor 11 monitors the dust concentration in real time and starts the induced draft fan 7 in the dust discharge cylinder 6. The induced draft fan 7 generates negative pressure in the dust discharge cylinder 6. Under the action of negative pressure, the dust in the air moves towards the dust removal filter bag 5. When the dust comes into contact with the dust removal filter bag 5, the larger dust particles adhere to the surface of the dust removal filter bag 5, while the finer dust passes through the dust removal filter bag 5. Under the suction of the induced draft fan 7, the dust passes through the through holes on the horizontal plate 3 and is discharged from the hopper 2 through the dust discharge cylinder 6.

[0021] As dust removal operations continue, a large amount of larger dust particles will gradually accumulate on the surface of the dust collector filter bag 5. At this time, the valve 10 on the nitrogen main pipe 8 is manually opened, and nitrogen gas enters the filter bag frame 4 from the nitrogen main pipe 8 through the nitrogen branch pipe 9. The nitrogen gas blows from the inside of the dust collector filter bag 5 to the outside. The nitrogen gas flow impacts the surface of the dust collector filter bag 5, blowing off the attached dust and causing the dust to fall to the bottom of the bin 2. The bottom of the bin 2 is 10° inclined. The dust falling from the dust collector filter bag 5 slides and accumulates at the lower end of the bottom of the bin 2 under the action of gravity. Finally, the workers load the accumulated dust onto a truck and transport it away.

[0022] When the dust concentration detected by the dust concentration sensor 11 exceeds the preset threshold, the dust concentration sensor 11 transmits the monitoring signal to the control terminal of the induced draft fan 7, increasing the speed of the induced draft fan 7 and enhancing its suction capacity for dust-laden gas to cope with higher dust concentrations; when the dust concentration detected by the dust concentration sensor 11 is lower than the preset threshold, the dust concentration sensor 11 transmits the monitoring signal to the control terminal of the induced draft fan 7, reducing the speed of the induced draft fan 7 to achieve energy saving.

[0023] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A dust removal device for a blast furnace ash discharge system, characterized in that, The silo includes a large ash silo body (1), a silo body (2) on one side of the large ash silo body (1), and openings for communication between the large ash silo body (1) and the silo body (2). A horizontal plate (3) is provided inside the silo body (2), and several through holes are provided on the horizontal plate (3). A filter bag frame (4) is snapped into the through holes, and a dust removal filter bag (5) is fitted onto the filter bag frame (4). Several dust discharge cylinders (6) are provided on the top of the silo body (2), and an induced draft fan (7) is provided in each dust discharge cylinder (6). A blowing unit for blowing the dust removal filter bag (5) is provided on the silo body (2).

2. The dust removal device for a blast furnace ash discharge system according to claim 1, characterized in that, The purging unit includes a nitrogen main pipe (8), which is equipped with a valve (10). Several nitrogen branch pipes (9) are connected to the nitrogen main pipe (8). One end of each nitrogen branch pipe (9) extends into the chamber (2). The outlet end of the nitrogen branch pipe (9) is located inside the filter bag frame (4). The diameter of the nitrogen branch pipe (9) is smaller than the inner diameter of the filter bag frame (4).

3. A dust removal device for a blast furnace ash discharge system according to claim 2, characterized in that, The valve (10) is a butterfly valve.

4. A dust removal device for a blast furnace ash discharge system according to claim 1, characterized in that, The bottom of the horizontal plate (3) is provided with a dust concentration sensor (11), which is electrically connected to the control terminal of the induced draft fan (7).

5. A dust removal device for a blast furnace ash discharge system according to claim 1, characterized in that, The dust discharge cylinder (6) is equipped with a rain cover (12).

6. A dust removal device for a blast furnace ash discharge system according to claim 1, characterized in that, The bottom of the silo (2) is sloping with a slope of 10°.

Images