Baghouse chamber structure for submerged arc furnace negative pressure

Abstract

The utility model discloses a kind of baghouse structure of large cloth bag dust collector of submerged arc furnace negative pressure, including support, baghouse and cloth bag group, baghouse is installed on support, baghouse is equipped with cloth bag group inside, the inside of the baghouse is separated into multiple independent chambers by installing partition, every independent chamber is provided with dust discharge hopper, air inlet pipeline, exhaust pipeline and blowback mouth, blowback mouth is communicated with each blowback mouth by blowback pipeline.The baghouse structure of large cloth bag dust collector of submerged arc furnace negative pressure, through the working mode of multiple-chamber independent dust filtering, can realize on-line blowback dust cleaning and bag replacement maintenance, realize separate dust removal operation control.

Description

Technical Field

[0001] This utility model relates to the technical field of baghouse dust collection equipment, specifically a baghouse structure for a negative pressure large baghouse dust collector for a submerged arc furnace. Background Technology

[0002] Baghouse dust collectors for electric arc furnaces are environmental protection devices commonly used in the metallurgical industry for flue gas treatment. Dust-laden gas enters the dust collector through the inlet and first passes through a pre-dust collection device for separation of coarse dust particles. Then, the gas enters the filter chamber containing filter bags. Dust is trapped on the outer surface of the filter bags, while clean gas passes through the filter bags into the clean air chamber and is discharged from the outlet, thus achieving gas-solid separation. As the filtration process proceeds, dust gradually accumulates on the surface of the filter bags. When a certain resistance value or a set time is reached, the dust removal system is activated. Common dust removal methods include pulse jet cleaning, which uses compressed air to spray into the filter bags through pulse valves in a very short time, causing the filter bags to expand instantaneously, shaking off the surface dust, which falls into the ash hopper.

[0003] The exhaust gas from electric arc furnaces is characterized by high temperatures. Typically, a waste heat boiler is installed between the electric arc furnace and the baghouse dust collector to convert heat and reduce the temperature of the exhaust gas entering the baghouse dust collector through heat exchange. However, due to the unstable recovery temperature of the waste heat boiler, the temperature of the exhaust gas entering the baghouse dust collector is unpredictable. The baghouse structure of the baghouse dust collector frequently deforms due to thermal expansion and contraction, leading to damage and failure of connecting bolts and welds. Furthermore, during pulse-jet cleaning, the valves in the exhaust gas pipeline need to be closed, and the baghouse dust collector needs to stop filtering the exhaust gas. Maintenance also requires this, disrupting continuous production and exhaust gas treatment. Therefore, this application is proposed to address the aforementioned problems. Utility Model Content

[0004] The purpose of this utility model is to provide a bag chamber structure for a negative pressure bag filter for a submerged arc furnace, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] The baghouse structure of the negative pressure baghouse dust collector for electric arc furnace includes a support frame, a baghouse, and a bag assembly. The baghouse is mounted on the support frame, and the bag assembly is assembled inside the baghouse. The interior of the baghouse is divided into multiple independent chambers by partitions. Each independent chamber is equipped with a dust discharge hopper, an inlet pipeline, an exhaust pipeline, and a back-blowing port. The back-blowing ports are connected to each other through back-blowing pipelines. An inlet valve is installed on the inlet pipeline, and the exhaust pipeline and the back-blowing pipeline are connected to the independent chambers through air valves.

[0007] As a further embodiment of this utility model: the bag chamber is composed of stainless steel plates that are stamped and bent into a wave shape, and connected together by welding to form a large integrated bag chamber. The bag chamber is divided into multiple independent chambers by installing partitions.

[0008] As a further embodiment of this utility model: both the outer side and the inner side of the bag chamber are equipped with longitudinal stabilizing angle steels via connecting seats, and the partition is fixed inside the bag chamber by the longitudinal stabilizing angle steels on the inner side of the bag chamber, with the longitudinal stabilizing angle steels on the inner and outer sides of the bag chamber corresponding to each other.

[0009] As a further improvement of this utility model: the outer and inner sides of the bag chamber are also provided with transverse fixing angle steels that are fixedly connected to the longitudinal stabilizing angle steels, and the positions of the transverse fixing angle steels on the outer and inner sides are corresponding.

[0010] As a further improvement of this utility model: two rows of reinforcing angle steels are arranged between the longitudinal stabilizing angle steels inside the bag chamber, and the partition is located between the two rows of reinforcing angle steels.

[0011] As a further embodiment of this utility model: the bag assembly includes a bag cage and a perforated plate. The perforated plate is installed inside the transverse fixing angle steel on the inner side of the bag chamber. The perforated plate is welded to the partition. Multiple bag cages are provided on the perforated plate, and bag cages are equipped with cloth bags.

[0012] As a further improvement of this utility model: the output end of the dust hopper is equipped with an ash discharge valve, and multiple air inlet pipelines are connected to the exhaust pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The baghouse structure of this negative pressure baghouse dust collector for electric arc furnaces, through the multi-chamber independent dust filtration working mode, enables online back-blowing cleaning and bag replacement maintenance, and realizes independent dust removal operation control.

[0015] 2. The baghouse structure of this negative pressure baghouse dust collector for submerged arc furnace uses wavy bending to offset thermal expansion, eliminating and adapting to the structural effects of thermal expansion on the baghouse. The longitudinal stabilizing angle steel strengthens the structural strength of the baghouse, enabling it to maintain its shape when subjected to positive and negative air pressure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the bag chamber structure of a negative pressure large bag dust collector for a submerged arc furnace.

[0017] Figure 2 This is a schematic diagram of the bag chamber structure in a negative pressure baghouse dust collector for a submerged arc furnace.

[0018] Figure 3 This is a rear sectional view of the bag chamber structure of a large bag filter for negative pressure in a submerged arc furnace.

[0019] Figure 4 This is a schematic diagram of the transversely fixed angle steel in the bag chamber structure of a large bag filter for negative pressure in a submerged arc furnace.

[0020] Figure 5 This is a schematic diagram of the partition plate in the bag chamber structure of a negative pressure baghouse dust collector for a submerged arc furnace.

[0021] In the diagram: 1. Support frame; 2. Bag chamber; 3. Bag assembly; 301. Bag cage; 302. Tube sheet; 4. Back-blowing port; 5. Dust hopper; 6. Ash discharge valve; 7. Air valve; 8. Back-blowing pipeline; 9. Exhaust pipe; 10. Inlet valve; 11. Inlet pipeline; 12. Connecting seat; 13. Horizontal fixing angle steel; 14. Longitudinal stabilizing angle steel; 15. Partition plate; 16. Reinforcing angle steel; 17. Exhaust pipeline. Detailed Implementation

[0022] Please see Figures 1-5 In this embodiment of the utility model, the baghouse structure of the negative pressure baghouse dust collector for a submerged arc furnace includes a support 1, a baghouse 2, and a bag assembly 3. The baghouse 2 is mounted on the support 1, and the bag assembly 3 is installed inside the baghouse 2. The interior of the baghouse 2 is divided into multiple independent chambers by a partition 15. Each independent chamber is equipped with a dust discharge hopper 5, an inlet pipe 11, an exhaust pipe 17, and a back-blowing port 4. The back-blowing ports 4 are connected to each other through back-blowing pipes 8. An inlet valve 10 is installed on the inlet pipe 11. The exhaust pipe 17 and the back-blowing pipe 8 are connected to the independent chambers through air valves 7. Each independent chamber of the baghouse 2 corresponds to a dust discharge hopper. 5. Each independent chamber is equipped with an inlet pipe 11 and an exhaust pipe 17. The independent chamber space is smaller, making it easier to control the intake and exhaust of the exhaust gas. It can also ensure good dust removal effect during backflushing. After the dust-laden flue gas enters the independent chamber, it enters the bottom of the tube sheet evenly through the airflow distribution plate, and is discharged from the exhaust pipe 19 after being filtered by the filter bag. The working status of each independent chamber is regulated by the opening and closing of the air valve 7 and the inlet valve 10, realizing individual dust removal operation control. The dust collector can replace the filter bag online. If the filter bag in a certain chamber needs to be replaced without affecting the operation of the system, the chamber can be isolated from the system, while the other chambers continue to work normally without shutdown.

[0023] In a preferred embodiment, the bag chamber 2 is composed of stainless steel plates formed by stamping and bending into a corrugated shape, which are connected together by welding to form a large integral bag chamber 2. The bag chamber 2 is divided into multiple independent chambers by installing partitions 15. The bag chamber 2 is composed of stainless steel plates formed by stamping and bending into a corrugated shape. The temperature difference between the dust collector when it is not in use and when it is in use is more than 200°C. This structural design can offset thermal expansion through corrugated bending, eliminating and adapting to the structural effects of thermal expansion on the bag chamber 2. Both the outer side and the inner side of the bag chamber 2 are equipped with longitudinal stabilizing angle steels 14 through connecting seats 12. The partitions 15 are fixed to the inside of the bag chamber 2 through the longitudinal stabilizing angle steels 14 on the inner side of the bag chamber 2. The longitudinal stabilizing angle steels 14 on the inner and outer sides of the bag chamber 2 are positioned correspondingly. The corrugated bending design reduces the strength of the bag chamber 2, while the longitudinal stabilizing angle steels 14 strengthen the structural strength of the bag chamber 2, so that the bag chamber 2 can maintain its shape when subjected to positive and negative air pressure.

[0024] In a preferred embodiment, the outer and inner sides of the bag chamber 2 are also provided with transverse fixing angle steels 13 that are fixedly connected to the longitudinal stabilizing angle steel 14. The positions of the transverse fixing angle steels 13 on the outer and inner sides are corresponding. The transverse fixing angle steels 13 are perpendicular to and connected to the longitudinal stabilizing angle steel 14, thereby fixing the bag chamber 2 and improving the overall strength of the bag chamber 2.

[0025] In a preferred embodiment, two rows of reinforcing angle steels 16 are arranged between the longitudinal stabilizing angle steels 14 inside the bag chamber 2. The partition 15 is located between the two rows of reinforcing angle steels 16. The chambers of the bag chamber 2 are separated independently, and each chamber is dusted separately. Therefore, there will be an excessive pressure difference between the dust removal chamber and the non-dust removal chamber, which will cause deformation of the partition 15 and damage to the welding, resulting in sealing problems. Especially during the backflushing cleaning process, the backflushing cleaning chamber is under positive pressure, while the filtration and dust removal chamber is under negative pressure, resulting in a greater pressure difference. Therefore, it is necessary to set longitudinal stabilizing angle steels 14 and reinforcing angle steels 16 for reinforcement.

[0026] In a preferred embodiment, the bag assembly 3 includes a bag cage 301 and a tube sheet 302. The tube sheet 302 is installed inside the transverse fixed angle steel 13 on the inner side of the bag chamber 2. The tube sheet 302 is welded to the partition plate 15. Multiple bag cages 301 are provided on the tube sheet 302. Bags are assembled on the bag cages 301. A dust discharge valve 6 is provided at the output end of the dust discharge hopper 5. Multiple air inlet pipes 11 are connected to the exhaust pipe 9.

[0027] It should be noted that all the above embodiments belong to the same utility model concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.

[0028] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A baghouse structure for a negative pressure baghouse dust collector for a submerged arc furnace, comprising a support (1), a baghouse (2), and a bag assembly (3), wherein the baghouse (2) is mounted on the support (1), and the bag assembly (3) is installed inside the baghouse (2), characterized in that, The interior of the bag chamber (2) is divided into multiple independent chambers by installing a partition (15). Each independent chamber is equipped with a dust hopper (5), an air inlet pipe (11), an exhaust pipe (17), and a back-blowing port (4). The back-blowing port (4) is connected to each back-blowing port (4) through a back-blowing pipe (8). An air inlet valve (10) is installed on the air inlet pipe (11). The exhaust pipe (17) and the back-blowing pipe (8) are connected to the independent chambers through an air valve (7).

2. The baghouse structure of the negative pressure large bag filter for a submerged arc furnace according to claim 1, characterized in that, The bag chamber (2) is composed of stainless steel plates that are stamped and bent into a wave shape. They are connected together by welding to form a large bag chamber (2). The bag chamber (2) is divided into multiple independent chambers by installing partitions (15).

3. The baghouse structure of the negative pressure large bag filter for a submerged arc furnace according to claim 2, characterized in that, Both the outer side and the inner side of the bag chamber (2) are equipped with longitudinal stabilizing angle steels (14) via connecting seats (12). The partition (15) is fixed inside the bag chamber (2) via the longitudinal stabilizing angle steels (14) on the inner side of the bag chamber (2). The longitudinal stabilizing angle steels (14) on the inner and outer sides of the bag chamber (2) are in corresponding positions.

4. The baghouse structure of the negative pressure large bag filter for a submerged arc furnace according to claim 2, characterized in that, The outer and inner sides of the bag chamber (2) are also provided with transverse fixing angle steels (13) that are fixedly connected to the longitudinal stabilizing angle steel (14), and the positions of the transverse fixing angle steels (13) on the outer and inner sides are corresponding.

5. The baghouse structure of the negative pressure large bag filter for a submerged arc furnace according to claim 3, characterized in that, Two rows of reinforcing angle steels (16) are arranged between the longitudinal stabilizing angle steels (14) inside the bag chamber (2), and the partition (15) is located between the two rows of reinforcing angle steels (16).

6. The baghouse structure of the negative pressure large bag filter for a submerged arc furnace according to claim 4, characterized in that, The bag assembly (3) includes a bag cage (301) and a tube sheet (302). The tube sheet (302) is installed in the transverse fixed angle steel (13) inside the bag chamber (2). The tube sheet (302) is welded to the partition (15). Multiple bag cages (301) are provided on the tube sheet (302), and bag cages (301) are equipped with cloth bags.

7. The baghouse structure of the negative pressure large bag filter for a submerged arc furnace according to claim 1, characterized in that, The dust discharge hopper (5) is equipped with an ash discharge valve (6) at its output end, and multiple air inlet pipes (11) are connected to the exhaust pipe (9).

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