A bag-type dust collector with pre-dedusting and fire-catching functions

Abstract

The application discloses a bag type dust collector with pre-dedusting and fire catching functions. The front end of a fire catcher (2) is welded with an air inlet flue (1), and the rear end is adjacent to a top vertical air inlet bag type dust collector (4). The fire catcher (2) comprises a fire catcher shell (21), a baffle plate (22), a suspension rod (23) and a fire catcher ash bucket (24), and forms a multi-stage vertical curtain type fire catching device as a whole. The upper part of the fire catcher (2) is welded with a top air inlet flue (3). An ultrahigh negative pressure protector (7) is installed on the side or top of an upper box (41). An inert gas fire isolation device (6) is installed in the space above a dust collector ash bucket (43). A flower plate (44) is arranged around a vertical air inlet pipe (45). The application has three-stage pre-dedusting and spark catching functions, ensures that filter bags are not burned by sparks and have long service life, effectively isolates smoldering in the ash bucket, protects the filter bags, has a dust collector negative pressure overload protection function, and guarantees the safety of the structure of the dust collector.

Description

Technical Field

[0001] This invention belongs to the field of industrial flue gas treatment technology, specifically relating to a bag filter with pre-dust removal and fire capture functions. It is mainly used for bag filter dust removal of flue gas from sintering machine heads, and can also be used for dust removal of flue gas from high-temperature furnaces such as electric arc furnaces and electric furnaces. Background Technology

[0002] Traditionally, electrostatic precipitators are often used for dust removal in sintering machine head flue gas. However, corona discharge often fuels the reignition of sparks, increasing the risk of fire in the dust collector.

[0003] Meanwhile, because electrostatic precipitators are highly susceptible to fluctuations in sintering flue gas conditions, their dust removal efficiency is unstable. Furthermore, the rapping cleaning process generates secondary dust, resulting in high outlet dust concentrations (typically 50–150 mg / m³). This can easily lead to problems such as ash accumulation, scaling, and blockage in downstream desulfurization and denitrification equipment, as well as catalyst poisoning, deactivation, and wear. It also exacerbates the wear of the main exhaust fan blades, making it difficult to ensure that the flue gas purification system can stably meet emission standards. This results in frequent shutdowns for production equipment maintenance, a large workload for maintenance, and disruption to normal sintering production.

[0004] In addition, electrostatic precipitators also have problems such as high air leakage rate, easy corrosion, and high energy consumption.

[0005] Baghouse dust collectors, as a highly efficient dust removal technology, can solve the problems and drawbacks of electrostatic precipitators. The patent document for a top-vertical-inlet baghouse dust collector (patent number: ZL 201710986033.1) has been applied to dust removal of flue gas from sintering machine heads. This type of baghouse dust collector features high efficiency, low resistance, and energy saving, and also has a certain effect on capturing coarse particles and sparks. The particulate matter concentration in the flue gas at the dust collector outlet is consistently ≤10mg / m³, ensuring stable and compliant emissions from downstream desulfurization and denitrification systems.

[0006] However, in actual engineering applications, some projects still experience the phenomenon of sparks burning the filter bags, and top vertical air inlet baghouse dust collectors still need further innovation in spark capture technology.

[0007] In addition to the flue gas from sintering machines, the flue gas from other industrial furnaces and kilns often carries coarse dust particles and unburned sparks, which pose a serious threat to the safe and stable operation of bag filters and can cause problems such as bag burning, bag breakage, and excessive emissions, which urgently need to be addressed.

[0008] High-temperature furnace flue gas often contains unburned particles, which can cause smoldering in the ash hopper, leading to filter bag burning and even fire.

[0009] To prevent this from happening, safety measures must be taken to ensure the safe operation of the dust collector.

[0010] Dust collectors in sintering machines often operate under extremely high negative pressure conditions, which can easily cause structural deformation and weld cracking, leading to a reduction in the structural strength, rigidity, and stability of the dust collector, and even causing it to collapse and resulting in a safety accident. Summary of the Invention

[0011] This invention addresses the shortcomings of the aforementioned technologies by providing a baghouse dust collector with pre-dust removal and spark capture functions. It aims to enhance the pre-dust removal and spark capture functions and effects based on the current top vertical air inlet baghouse dust collector, compensate for the technical deficiency of existing dust collectors in resisting ultra-high negative pressure, add fire extinguishing function to the ash hopper, and effectively ensure the long service life of filter bags and the safe and reliable operation of the equipment.

[0012] The technical solution of this invention is: a bag filter with pre-dust removal and fire catching functions, wherein the bag filter is a top-vertical-inlet bag filter, comprising an upper chamber, a middle chamber, a dust collector hopper, a tube sheet, a vertical inlet duct, a pulse cleaning device, a shrinkable louvered baffle, filter bags, and bag cages, the shrinkable louvered baffle being disposed within the middle chamber; the top-vertical-inlet bag filter has an inlet flue and a fire catcher on one side, and on the other side... An exhaust duct is installed on the top or front; the front end of the fire catcher is welded to the intake duct, the rear end is adjacent to the top vertical intake bag filter, and the upper part is connected to the top intake duct; a vertical intake pipe is installed inside the upper box, a shrinkable louvered baffle is installed at the bottom of the vertical intake pipe, a tube sheet is installed at the bottom of the upper box, a pulse cleaning device is installed at the top of the tube sheet, filter bags and bag cages are installed at the tube sheet opening, and vertically suspended in the middle box; a middle box is welded to the bottom of the tube sheet, and a dust collector hopper is welded to the bottom of the middle box. The fire catcher includes a fire catcher shell, a deflector impact plate, a suspension rod, and a fire catcher ash hopper. The suspension rod is welded in a stepped manner inside the fire catcher, and the deflector impact plate is installed on the suspension rod. The fire catcher as a whole forms a multi-stage curtain-like fire catching device, and an upward airflow channel is formed between the deflector impact plates; or the fire catcher is a cyclone dust collector or an inertial dust collector; the top air inlet flue is welded to the upper part of the fire catcher. The top air inlet flue includes a reducing pipe, an elbow, a reducing main pipe, and a branch pipe, and the branch pipe is connected to the top vertical air inlet bag filter. The perforated panels are arranged around the vertical air inlet duct. An ultra-high negative pressure protector is installed on the side or top of the upper housing. When the dust collector is overloaded by negative pressure, the ultra-high negative pressure protector is used to draw in air and reduce the negative pressure deformation of the dust collector. A flame arrestor is installed around the shrinkable louvered baffle. An inert gas flame isolation device is installed in the upper space of the dust collector ash hopper to isolate the combustion of unburned particles in the ash hopper. The flue gas first enters the fire catcher to achieve the first stage of pre-dust removal and spark capture. Then, the flue gas is transported and distributed to the top vertical air inlet pipe through the top air inlet duct. The vertical air inlet pipe transports the flue gas to the shrinking louvered baffle to achieve the second stage of pre-dust removal and spark capture. The flue gas diffuses from the shrinking louvered baffle to the surrounding fire-resistant net, and the fire-resistant net is used to achieve the third stage of spark interception and capture. The fire catcher is formed by multiple suspended deflector plates, which form a stepped curtain. An upward airflow channel is formed between the deflector plates, which remove large particles and sparks.

[0013] According to an embodiment of the present invention, a vertical air inlet duct serves as a dust removal unit. Multiple dust removal units are spliced ​​and combined according to the flue gas volume to form various tube sheet arrangement schemes, including: When the flue gas volume is small, a dust collector unit is used, with the tube sheet arranged in a windmill shape around the vertical air inlet duct. When dealing with large volumes of flue gas, multiple dust collector units are spliced ​​and arranged together, with the tube sheet arranged around the vertical air inlet duct. Depending on the actual conditions of the project, the number of tube sheet holes and their corresponding jet cleaning devices on each side are adjusted or eliminated in the same direction.

[0014] According to an embodiment of the present invention, the deflector impact plate is made of a wear-resistant porous material, including a metal plate and a metal mesh.

[0015] According to an embodiment of the present invention, the fire-retardant mesh is made of porous flexible flame-retardant material, including metal mesh and fiber mesh.

[0016] According to an embodiment of the present invention, the top vertical air inlet bag filter adopts pulse jet cleaning and is assisted by mechanical vibration or sonic cleaning.

[0017] According to an embodiment of the present invention, the inert gas flameproof device includes a solenoid valve, a gas supply pipe, and a nozzle.

[0018] The function of the top air inlet flue of this invention is to deliver and distribute flue gas to each dust removal unit, without limiting the shape and material of each component.

[0019] The present invention does not limit the number of holes in the perforated plate and the corresponding blowing device, and the number of holes in the perforated plate can be adjusted or canceled in a certain position.

[0020] The inert gas fireproof device of this invention is installed in the upper space of the ash hopper. When in operation, it forms a nitrogen curtain to isolate smoldering in the ash hopper. There are no restrictions on the model of the solenoid valve, the type and number of nozzles of the inert gas fireproof device.

[0021] The ultra-high negative pressure protector of this invention opens the cover to draw in air when the dust collector experiences ultra-high negative pressure, reducing the deformation of the dust collector under negative pressure and protecting its structure. The ultra-high negative pressure protector can be in the form of a counterweight or spring, etc., and its cover is normally closed. The opening force of the cover is adjustable. The number of ultra-high negative pressure protectors used can be adjusted.

[0022] When the powder collected in the ash hopper of the fire arrester has a high iron content, it can be recycled separately.

[0023] The working principle of this invention is as follows: Flue gas first enters the flame arrester for first-stage pre-dust removal and spark collection. Then, the flue gas is transported and distributed through the top inlet duct to the vertical inlet pipe of the top vertical inlet baghouse dust collector. From there, it enters the contraction-shaped louvered baffle, where large particles and sparks settle directly into the ash hopper due to inertia, achieving second-stage pre-dust removal and spark collection. The flue gas then diffuses from the contraction-shaped louvered baffle to the surrounding flame arrestor, where it is intercepted and collected as a third stage of sparks. Finally, the flue gas diffuses radially to the filter bags, undergoes efficient filtration, and collects in the upper housing before being discharged from the outlet duct. When the dust collector resistance increases, the pulse cleaning device starts working, and dust on the filter bag surface falls into the ash hopper and is discharged from the ash outlet. When combustion occurs in the ash hopper, the inert gas flame isolation device is activated to isolate smoldering within the ash hopper. When the dust collector is overloaded by negative pressure, the high negative pressure protector automatically activates, drawing in air to protect the dust collector structure.

[0024] The beneficial effects of this invention are: This invention has three-stage pre-dust removal and spark capture functions, which can efficiently capture particulate matter and sparks in flue gas, ensure that the filter bags are not burned by sparks and have a long service life, effectively isolate smoldering in the ash hopper and protect the filter bags, protect the dust collector from negative pressure overload, and ensure the structural safety of the dust collector; This invention is suitable for technical transformation and new construction projects of high-temperature flue gas dust removal in sintering machine heads and kilns. Attached Figure Description

[0025] Figure 1 It is a bag filter (two units) with pre-dust removal and flame arrest functions.

[0026] Figure 2 yes Figure 1 Layout diagram of the central panel.

[0027] Figure 3 It is a bag filter (one unit) with pre-dust removal and flame arrest functions.

[0028] Figure 4 yes Figure 3 Layout diagram of the central panel.

[0029] Figure 5 It is a bag filter (six units) with pre-dust removal and flame arrest functions.

[0030] Figure 6 yes Figure 5 Layout diagram of the central panel.

[0031] In the diagram: 1-Inlet flue, 2-Flame arrester, 21-Flame arrester housing, 22-Baffle impact plate, 23-Suspension rod, 24-Flame arrester ash hopper, 3-Top inlet flue, 31-Reducing pipe, 32-Elbow, 33-Reducing main pipe, 34-Branch pipe, 4-Top vertical inlet bag filter, 41-Upper housing, 42-Middle housing, 43-Dust collector ash hopper, 44-Tube sheet, 45-Vertical inlet pipe, 46-Pulse cleaning device, 47-Contracting louvered baffle, 48-Filter bag and cage, 5-Flame arrester mesh, 6-Inert gas flameproof device, 61-Solenoid valve, 62-Air supply pipe, 63-Nozzle, 7-Ultra-high negative pressure protector, 8-Outlet flue. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] A baghouse dust collector with pre-dust removal and fire catching functions is described. The baghouse dust collector is a top-vertical-inlet baghouse dust collector 4, comprising an upper housing 41, a middle housing 42, a dust collector hopper 43, a tube sheet 44, a vertical inlet duct 45, a pulse cleaning device 46, a shrinkable louvered baffle 47, filter bags, and bag cages 48. The shrinkable louvered baffle 47 is disposed within the middle housing 42. One side of the top-vertical-inlet baghouse dust collector 4 is provided with an inlet flue duct 1 and a fire catcher 2, while the other side or top is equipped with an outlet flue. 8; the front end of the fire catcher 2 is welded to the air inlet flue 1, the rear end is adjacent to the top vertical air inlet bag filter 4, and the upper part is connected to the top air inlet flue 3; the upper box 41 is equipped with a vertical air inlet pipe 45, the lower part of the vertical air inlet pipe 45 is equipped with a shrinkable louvered baffle 47, the bottom of the upper box 41 is equipped with a tube sheet 44, the upper part of the tube sheet 44 is equipped with a pulse cleaning device 46, the tube sheet opening is equipped with filter bags and bag cages 48, which are vertically suspended in the middle box 42, the lower part of the tube sheet 44 is welded to the middle box 42, and the lower part of the middle box 42 is welded to the dust collector ash hopper 43. The fire catcher 2 includes a fire catcher housing 21, a baffle plate 22, a suspension rod 23, and a fire catcher ash hopper 24; the suspension rod 23 is welded in a stepped manner inside the fire catcher 2, and the baffle plate 22 is installed on the suspension rod 23; the fire catcher 2 as a whole forms a multi-stage curtain-shaped fire catching device, and an upward airflow channel is formed between the baffle plates 22; or the fire catcher 2 can also be a cyclone dust collector or an inertial dust collector; the top air inlet flue 3 is welded to the upper part of the fire catcher 2; The top air inlet flue 3 includes a reducing pipe 31, an elbow 32, a reducing main pipe 33, and a branch pipe 34; the branch pipe 34 is connected to the top vertical air inlet bag filter 4. The perforated plate 44 is arranged around the vertical air inlet pipe 45. The upper housing 41 is equipped with an ultra-high negative pressure protector 7 on its side or top. When the dust collector is overloaded by negative pressure, the ultra-high negative pressure protector 7 can draw in air to reduce the negative pressure deformation of the dust collector and protect its structure. The shrinkable louvered baffle 47 is equipped with a flame arrestor 5 around its perimeter. The upper space of the dust collector ash hopper 43 is equipped with an inert gas fire isolation device 6, which can effectively isolate the combustion of unburned particles in the ash hopper. The flue gas first enters the fire catcher 2 to achieve the first stage of pre-dust removal and spark capture. Then, the flue gas is transported and distributed to the top vertical air inlet pipe 45 through the top air inlet flue 3. The vertical air inlet pipe 45 transports the flue gas to the shrink-shaped louvered baffle 47 to achieve the second stage of pre-dust removal and spark capture. The flue gas diffuses from the shrink-shaped louvered baffle 47 to the surrounding fire-resistant net 5, and the fire-resistant net 5 is used to achieve the third stage of spark interception and capture. The fire catcher 2 is formed by multiple suspended deflector impact plates 22, which form a stepped curtain. An upward airflow channel is formed between the deflector impact plates 22, which can remove large particles and sparks.

[0034] The inert gas fireproof device 6 includes a solenoid valve 61, a gas supply pipe 62, and a nozzle 63.

[0035] This invention can be designed into various technical solutions according to the actual flue gas volume, and form multi-unit splicing combinations and tube sheet arrangements.

[0036] Example 1: A bag filter with pre-dust removal and fire capture functions, Figure 1 , Figure 2Taking a baghouse dust collector with two vertical air inlets as an example, the specific implementation steps are as follows: First, manufacture the various components of this patent, including the air inlet duct 1, the fire catcher 2, the top air inlet duct 3, the top vertical air inlet baghouse dust collector 4, the fire arrestor 5, the inert gas fire barrier 6, the ultra-high negative pressure protector 7, and the air outlet duct 8, etc., and weld the above components together to form an integrated device; the fire catcher 2 includes the fire catcher housing 21, the baffle impact plate 22, the suspension rod 23, and the ash hopper 24; the top air inlet duct 3 includes the reducing pipe 31, the elbow 32, the reducing main pipe 33, and the branch pipe 34; the top vertical air inlet baghouse dust collector 4 includes the upper box 41, the middle box 42, the ash hopper 43, the tube sheet 44, the vertical air inlet duct 45, the pulse cleaning device 46, the shrinkable louvered baffle 47, the filter bag and the bag cage 48; the inert gas fire barrier 6 includes the solenoid valve 61, the air supply pipe 62, and the nozzle 63.

[0037] The front end of the fire catcher 2 is welded to the inlet flue 1, and the rear end is adjacent to the top vertical inlet bag filter 4. The top inlet flue 3 is welded to its upper part. The fire catcher 2 is formed by welding the fire catcher shell 21 and the fire catcher ash hopper 24. The inside of the fire catcher is welded with a suspension rod 23 in a stepped manner. The suspension rod 23 is equipped with a baffle impact plate 22, forming a multi-stage curtain-like fire catcher device. The top inlet flue 3 is composed of a reducing pipe 31, an elbow 32, a reducing main pipe 33, and a branch pipe 34. The branch pipe 34 of the top inlet flue 3 is welded to the vertical inlet pipe 45 of the top vertical inlet bag filter 4. The vertical inlet pipe 45 is installed inside the upper box 41. The bottom of the upper box 41 is welded with a tube sheet 44, and the lower part of the tube sheet 44 is welded with a middle box 42. The lower part of the middle box 42 is welded with an ash hopper 43, the upper part of the tube sheet 44 is equipped with a pulse cleaning device 46, the tube sheet opening is equipped with filter bags and bag cages 48, and the filter bags and bag cages 48 are vertically suspended in the middle box 42; the retractable louvered baffle 47 inside the middle box 42 is coaxially installed with the bottom of the vertical air inlet pipe 45; the fire arrestor 5 is vertically suspended around the periphery of the retractable louvered baffle 47; the ultra-high negative pressure protector 7 is welded to the side of the upper box 41, and the exhaust flue 8 is welded to the rear side of the upper box 41; the inert gas fire isolation device 6 is installed in the upper space of the fire arrester ash hopper 24 and ash hopper 43, the air supply pipe 62 is welded to the ash hopper wall panel, the solenoid valve 61 is welded to the air supply pipe 62 or connected by a flange, and the nozzle 63 is installed at the lower part of the air supply pipe 62.

[0038] After the above equipment is installed and put into operation, the flue gas first enters the flame arrester 2 for the first stage of pre-dust removal and spark capture. Then, the flue gas is transported and distributed through the top air inlet flue 3 to the vertical air inlet pipe 45 of the top vertical air inlet bag filter 4. The vertical air inlet pipe 45 then transports the flue gas to the contraction-shaped louvered baffle 47 for the second stage of pre-dust removal and spark capture. The flue gas diffuses from the contraction-shaped louvered baffle 47 to the surrounding flame arrestor 5, where the flame arrestor 5 achieves the third stage of spark interception and capture. Finally, the flue gas is filtered through the filter bag 48 and discharged through the exhaust flue 8 after purification. When the resistance of the dust collector increases, the pulse cleaning device 46 starts to work, and the dust on the surface of the filter bag 48 falls into the ash hopper 43 and is discharged from the ash discharge port. When combustion occurs in the ash hoppers 24 and 43 of the flame arrester, the inert gas flame isolation device 6 is activated to isolate the smoldering combustion in the ash hopper. When the dust collector is overloaded by negative pressure, the high negative pressure protector 7 will automatically activate, drawing in air to protect the dust collector structure.

[0039] Example 2: When the actual flue gas volume is small, a single-unit technical solution can be adopted. The overall structure of the equipment, the arrangement of the vertical air inlet duct 45 and the tube sheet 44 are shown in [reference needed]. Figure 3 , Figure 4 .

[0040] Example 3: When the actual flue gas volume is very large, a double-row arrangement of six units can be adopted. The tube sheet 44 is arranged in an array around the vertical air inlet duct 45. The number of holes in the tube sheet on each side can be adjusted according to the actual situation of the project. The overall structure and layout of the equipment are shown in [reference needed]. Figure 5 , Figure 6 .

[0041] Similarly, other units can be assembled in the same way.

[0042] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A bag filter with pre-dust removal and fire catching functions, wherein the bag filter is a top vertical inlet bag filter (4), the top vertical inlet bag filter (4) includes an upper box (41), a middle box (42), a dust collector hopper (43), a tube sheet (44), a vertical inlet pipe (45), a pulse cleaning device (46), a shrinkable louvered baffle (47), filter bags and bag cages (48), the shrinkable louvered baffle (47) is installed in the middle box (42); the top vertical inlet bag filter (4) has an inlet flue (1) and a fire catcher (2) on one side, and an outlet flue (8) installed on the other side or the top; The fire catcher (2) is welded to the front end of the air inlet flue (1), and adjacent to the top vertical air inlet bag filter (4) at the rear end. It is connected to the top air inlet flue (3) at the top. The upper box (41) is equipped with a vertical air inlet pipe (45), and a shrinkable louvered baffle (47) is installed at the bottom of the vertical air inlet pipe (45). The bottom of the upper box (41) is equipped with a tube sheet (44), and a pulse cleaning device (46) is installed on the upper part of the tube sheet (44). Filter bags and bag cages (48) are installed at the opening of the tube sheet and are vertically suspended in the middle box (42). The lower part of the tube sheet (44) is welded to the middle box (42), and the lower part of the middle box (42) is welded to the dust collector hopper (43). Its characteristics are: The fire catcher (2) includes a fire catcher housing (21), a baffle plate (22), a suspension rod (23), and a fire catcher ash hopper (24); the fire catcher (2) has a suspension rod (23) welded in a stepped manner inside, and a baffle plate (22) is installed on the suspension rod (23); the fire catcher (2) as a whole forms a multi-stage curtain-shaped fire catching device, and an upward airflow channel is formed between the baffle plates (22); or the fire catcher (2) is a cyclone dust collector or an inertial dust collector; the top air inlet flue (3) is welded to the upper part of the fire catcher (2). The top air inlet flue (3) includes a reducing pipe (31), an elbow (32), a reducing main pipe (33), and a branch pipe (34), wherein the branch pipe (34) is connected to the top vertical air inlet bag filter (4); The perforated plate (44) is arranged around the vertical air inlet pipe (45); An ultra-high negative pressure protector (7) is installed on the side or top of the upper housing (41). When the dust collector is overloaded by negative pressure, the ultra-high negative pressure protector (7) is used to draw in air and reduce the negative pressure deformation of the dust collector. A fire-resistant net (5) is installed around the shrink-shaped louvered baffle (47). An inert gas fire isolation device (6) is installed in the upper space of the dust collector ash hopper (43) to isolate the combustion of unburned particles in the ash hopper. The flue gas first enters the fire catcher (2) to achieve the first stage of pre-dust removal and spark capture. Then the flue gas is transported and distributed to the top vertical air inlet pipe (45) through the top air inlet flue (3). It is then transported to the shrinking louvered baffle (47) by the vertical air inlet pipe (45) to achieve the second stage of pre-dust removal and spark capture. The flue gas diffuses from the shrinking louvered baffle (47) to the surrounding fire-resistant net (5). The fire-resistant net (5) is used to achieve the third stage of spark interception and capture. The fire catcher (2) is formed by multiple suspended deflector impact plates (22) and presents a stepped curtain. An upward airflow channel is formed between the deflector impact plates (22) to remove large particles and sparks.

2. A bag filter with pre-dust removal and fire capture functions as described in claim 1, characterized in that: The vertical air inlet duct (45) serves as a dust removal unit; multiple dust removal units are spliced ​​and combined according to the flue gas volume to form various tube sheet (44) layout schemes, including: When the flue gas volume is small, a dust collector unit is used, and the tube sheet (44) is arranged in a windmill shape around the vertical air inlet pipe (45); When the flue gas volume is large, multiple dust collector units are spliced ​​and arranged together. The tube sheet (44) is arranged around the vertical air inlet pipe (45). According to the actual situation of the project, the number of holes of the tube sheet (44) on each side and the corresponding blower (46) are adjusted or canceled in the same position.

3. A bag filter with pre-dust removal and fire capture functions according to claim 1, characterized in that: The deflector impact plate (22) is made of wear-resistant porous material, including metal plate and metal mesh.

4. A bag filter with pre-dust removal and fire capture functions according to claim 1, characterized in that: The fire-retardant mesh (5) is made of porous flexible flame-retardant material, including metal mesh and fiber mesh.

5. A bag filter with pre-dust removal and fire capture functions according to claim 1, characterized in that: The top vertical air inlet bag filter (4) uses pulse jet cleaning and is supplemented by mechanical vibration or sonic cleaning.

6. A bag filter with pre-dust removal and fire capture functions according to claim 1, characterized in that: The inert gas fireproof device (6) includes a solenoid valve (61), a gas supply pipe (62), and a nozzle (63).

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