Bag-type dust removal device and method for treating magnetized and cracked flue gas

Abstract

The invention relates to a bag-type dust removal device and method for treating magnetized and cracked flue gas. The bag-type dust removal device comprises a dust removal box, and the dust removal box communicates with a dust gas pipe and a clean gas pipe; a dust remover for dividing an inner cavity of the dust removal box into a dust-containing area and a purification area is rotationally arranged in the dust removal box, and the purification area is communicated with the air purification pipe; a plurality of through holes communicated with the dust-containing area and the purification area are formed in the dust remover, and cloth bag air duct assemblies are arranged in the through holes; an air guide box communicated with the dust air pipe is arranged in the dust-containing area, an air collecting box and a nozzle are arranged in the purification area, an opening of the air guide box and / or the nozzle obliquely faces the through hole, and the openings of the air guide box, the air collecting box and the nozzle intersect with the motion trail of the through hole; the air guide box is communicated with the air collection box through a through hole; the air collection box is communicated with the nozzle; the air guide box, the air collection box and the nozzles guide air flow to penetrate through the through holes back and forth, the dust remover is driven to rotate through the air flow, smoke filtering and back-blowing dust removal of the cloth bag air duct assembly are completed at the same time, and the dust removal cost is greatly saved.

Description

Technical Field

[0001] The present invention relates to the technical field of bag dust removal, and particularly to a bag dust removal device and method for treating magnetized cracked flue gas. Background Art

[0002] With the enhancement of environmental awareness and the increase in waste treatment requirements, the magnetized cracking technology, as a new type of waste and solid waste treatment technology, has broad development prospects; during the magnetized cracking process, organic substances decompose rapidly at low temperatures, generating combustible gases, which can usually be used as fuels. However, a large amount of dust and harmful gases are also generated during the magnetized cracking process. These dust and harmful gases make the combustible gases unable to be directly used, and it is necessary to clean and purify the flue gas generated by magnetized cracking.

[0003] For the dust in the flue gas, a combination of an activated carbon injection system and bag dust removal is usually adopted. The activated carbon injection device injects activated carbon to adsorb various gas molecules and particulate matters, and the bag dust removal is used to filter and capture the dust in the flue gas; however, the bag dust removal device usually adopts the method of blowing flue gas into the bag. The dust adheres to the surface of the bag, resulting in bag blockage and affecting the dust removal efficiency; therefore, a reverse blowing mechanism is often used to blow the bag dust removal device, but the existing reverse blowing mechanism usually adopts the method of blowing air into the bag dust removal device in the reverse direction by a fan for cleaning, which greatly increases the cost of dust removal. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a bag dust removal device and method for treating magnetized cracked flue gas, which guides the air flow to pass through the through holes back and forth through a wind guide box, a wind collection box and a nozzle, drives the dust collector to rotate through the air flow, and simultaneously completes the filtration of the flue gas and the reverse blowing and dust cleaning of the bag and air duct assembly, greatly saving the cost of dust removal, being simple, efficient, safe, reliable and convenient to operate.

[0005] The present invention is realized through the following technical solutions. A bag dust collector for magnetized cracking flue gas treatment is provided, including a dust removal box, which is connected with a dust pipe and a clean gas pipe; a dust collector is rotatably arranged in the dust removal box, and the dust collector divides the inner cavity of the dust removal box into a dust-containing area and a purification area, and the purification area is connected with the clean gas pipe; a number of through holes are opened on the dust collector, and the dust-containing area and the purification area are connected through the through holes, and a bag air duct assembly is arranged in the through holes; a wind guiding box connected with the dust pipe is arranged in the dust-containing area, and a wind collecting box and a nozzle are arranged in the purification area. The openings of the wind guiding box and / or the nozzle are inclined towards the through holes, and the openings of the wind guiding box, the wind collecting box, and the nozzle respectively intersect with the movement trajectories of the through holes; the wind guiding box and the wind collecting box are connected through the through holes, the wind collecting box is connected with the nozzle, and the nozzle is located at one end of the dust collector away from the wind collecting box; the air flow is guided to pass through the through holes back and forth through the wind guiding box, the wind collecting box, and the nozzle, and the dust collector is driven to rotate by the air flow, while the filtration of the flue gas and the back blowing and dust cleaning of the bag air duct assembly are completed, greatly saving the cost of dust removal. As an optimization, the number of through holes simultaneously connected by the wind guiding box and the wind collecting box is greater than the number of through holes connected by the nozzle, and the wind collecting box is connected with the nozzle through a tapered pipe; the air flow velocity of the nozzle is increased by reducing the flow cross-section.

[0006] As an optimization, a number of wind guiding plates are arranged in the wind guiding box, which are inclined towards the through holes and arranged in sequence along the movement trajectory of the through holes, and the wind guiding plates extend from one end of the dust pipe close to the dust collector towards the end of the dust pipe away from the dust collector in sequence along the dust gas transmission direction; the flue gas is respectively transported into different through holes through the wind guiding plates, preventing uneven flue gas transportation in each through hole corresponding to the wind guiding box.

[0007] As an optimization, a collecting hopper A is arranged at the bottom of the dust removal box, the wind guiding box is located between the dust collector and the collecting hopper A, and a discharge port A is opened at the bottom of the collecting hopper A; the dust in the dust removal box is collected through the collecting hopper A.

[0008] As an optimization, a collecting hopper B is arranged at the bottom of the wind guiding box, and a discharge port B is opened at the bottom of the collecting hopper B; the dust in the wind guiding box is collected through the collecting hopper B.

[0009] As an optimization, a scraping plate is arranged on one side of the wind guiding box facing the dust collector, and one end of the scraping plate away from the wind guiding box is attached to the dust collector; the dust attached to one side of the dust collector facing the dust-containing area is cleaned through the scraping plate.

[0010] As an optimization, the scraping plate is an annular structure extending along the opening direction of the wind guiding box, and the opening of the wind guiding box is located inside the annular scraping plate; the wind guiding box and the through hole are connected through the scraping plate, reducing the leakage of the flue gas transported from the wind guiding box towards the through hole.

[0011] As an optimization, one end of the nozzle communicating with the dust collector is connected with a flexible air duct. The end of the flexible air duct away from the nozzle is arranged in contact with the dust collector, and the movement trajectory of the end of the flexible air duct away from the nozzle intersects with the through hole; the nozzle and the through hole are connected through the flexible air duct, reducing the leakage of the flue gas conveyed by the nozzle towards the through hole.

[0012] A method for using a bag dust collector for magnetized cracking flue gas treatment includes the following steps: a. Input flue gas into the air guide box through the dust gas pipe, and the flue gas flows towards the through holes communicated with the air guide box through the air guide plates in sequence; b. The flue gas passes through the bag air duct assembly and enters the air collection box to form a completely purified air flow, and the dust in the flue gas is filtered on the side of the bag air duct assembly facing the air guide box; c. The air flow in the air collection box enters the nozzle through the conical pipe and is ejected through the nozzle, and the flow velocity of the air flow increases; d. The air flow in the nozzle passes through the flexible air duct and the through hole and enters the dust-containing area to blow and clean the dust on the bag air duct assembly; e. The dust collector rotates under the action of the air flow discharged from the air guide box and / or the nozzle, and the air flow discharged from the nozzle sequentially cleans the dust on the bag air duct assembly on the dust collector; f. The scraper cleans the side of the dust collector facing the dust-containing area, and the dust on the dust collector falls into the dust removal box and the air guide box; g. The dust falls into the dust removal box and gradually converges at the bottom of the aggregate hopper A, and then is discharged through the discharge port A; h. The dust falls into the air guide box and gradually converges at the bottom of the aggregate hopper B, and then is discharged through the discharge port B; i. The air flow in the dust-containing area passes through the through hole far from the air guide box and the nozzle and enters the purification area, and the dust in the air flow is filtered by the bag air duct assembly in the dust-containing area; j. The air flow in the purification area is discharged through the clean gas pipe.

[0013] The beneficial effects of the present invention are as follows: guiding the air flow to pass through the through hole back and forth through the air guide box, the air collection box and the nozzle, driving the dust collector to rotate through the air flow, and simultaneously completing the filtration of the flue gas and the back blowing and dust cleaning of the bag air duct assembly, greatly saving the cost of dust removal; increasing the flow velocity of the air flow ejected from the nozzle by reducing the flow cross-section; respectively conveying the flue gas to different through holes through the air guide plates to prevent uneven flue gas conveyance in the through holes corresponding to the air guide box; cleaning the dust attached to the side of the dust collector facing the dust-containing area through the scraper, and at the same time connecting the air guide box and the through hole to reduce the leakage of the flue gas conveyed by the air guide box towards the through hole; connecting the nozzle and the through hole through the flexible air duct to reduce the leakage of the flue gas conveyed by the nozzle towards the through hole. Description of the Drawings

[0014] Figure 1Schematic diagram of the internal structure of the present invention; Figure 2 Schematic diagram of the connection of the air guide box, dust collector, air collecting box and nozzle of the present invention; Figure 3 Schematic diagram of the internal structure of the air guide box of the present invention; Figure 4 Schematic diagram of the flue gas flow of the present invention; As shown in the figure: 1. Dust removal box, 2. Dust collector, 3. Cloth bag air duct assembly, 4. Air guide box, 5. Air collecting box, 6. Cone pipe, 7. Fixed ring, 8. Nozzle, 9. Air guide plate, 10. Aggregate hopper A, 11. Valve A, 12. Aggregate hopper B, 13. Valve B, 14. Scraper, 15. Flexible air duct, 16. Dust gas pipe, 17. Clean gas pipe, 18. Sealing ring, 19. Oil, 101. Dust-containing area, 102. Purification area, 201. Through hole. Detailed implementation manners

[0015] To clearly illustrate the technical features of this solution, the following elaborates on this solution through specific implementation manners.

[0016] As Figure 1 , Figure 2 and Figure 4 shown, the bag dust collector for magnetically cracked flue gas treatment of the present invention includes a dust removal box 1, and the dust removal box 1 is communicated with a dust gas pipe 16 and a clean gas pipe 17; a dust collector 2 is rotatably arranged in the dust removal box 1, and the dust collector 2 divides the inner cavity of the dust removal box 1 into a dust-containing area 101 and a purification area 102, and the purification area 102 is communicated with the clean gas pipe 17; a plurality of through holes 201 are formed in the dust collector 2, and the dust-containing area 101 and the purification area 102 are communicated through the through holes 201, and a cloth bag air duct assembly 3 is arranged in the through holes 201; an air guide box 4 communicated with the dust gas pipe 16 is arranged in the dust-containing area 101, an air collecting box 5 and a nozzle 8 are arranged in the purification area 102, the openings of the air guide box 4 and / or the nozzle 8 are inclined towards the through holes 201, and the openings of the air guide box 4, the air collecting box 5 and the nozzle 8 respectively intersect with the movement trajectories of the through holes 201; the air guide box 4 and the air collecting box 5 are communicated through the through holes 201, the air collecting box 5 is communicated with the nozzle 8, and the nozzle 8 is located at one end of the dust collector 2 away from the air collecting box 5.

[0017] The dust removal box 1 is a cylindrical structure extending in the vertical direction. A fixed ring 7 with an axis extending in the vertical direction is fixedly arranged in the dust removal box 1. The dust collector 2 is coaxially rotatably arranged in the fixed ring 7, and the dust collector 2 and the fixed ring 7 are connected by a sealing ring 18. The sealing ring 18 is sleeved on the rim part of the dust collector 2, and the sealing rings 18 are arranged in sequence in the vertical direction. Oil 19 is filled between adjacent sealing rings 18. The dust-containing area 101 is located below the dust collector 2, and the purification area 102 is located above the dust collector 2. The axis of the through hole 201 is different from the rotation axis of the dust collector 2. The cloth bag air duct assembly 3 is a prior art. The openings of the air guide box 4 and the nozzle 8 face the same side in the through hole 201. The number of through holes 201 covered by the openings of the air guide box 4 and the air collecting box 5 is the same, and the opening of the air collecting box 5 is located at the other end of the through hole 201 communicated with the opening of the air guide box 4.

[0018] Flue gas is input into the air guide box 4 through the dust pipe 16. The flue gas flows towards the through hole 201 communicated with the air guide box 4 through the air guide box 4. The flue gas passes through the cloth bag air duct assembly 3 and enters the air collecting box 5 to form a completely purified air flow. The dust in the flue gas is filtered on the side of the cloth bag air duct assembly 3 facing the air guide box 4. The air flow in the air collecting box 5 enters the through hole 201 communicated with the opening of the nozzle 8 through the nozzle 8 to blow and clean the dust on the cloth bag air duct assembly 3. At the same time, the dust collector 2 rotates under the action of the air flow discharged from the air guide box 4 and the nozzle 8. The air flow discharged from the nozzle 8 blows and cleans the dust on the cloth bag air duct assembly 3 on the dust collector 2 in sequence. The dust falls to the bottom of the dust removal box 1. At the same time, the air flow in the dust-containing area 101 passes through the through hole 201 far from the air guide box 4 and the nozzle 8 and enters the purification area 102. The dust in the air flow is filtered in the dust-containing area 101 by the cloth bag air duct assembly 3. The air flow in the purification area 102 is discharged through the clean air pipe 17. As Figure 1 、 Figure 2 And Figure 4 As shown, the number of through holes 201 simultaneously communicated by the air guide box 4 and the air collecting box 5 is greater than the number of through holes 201 communicated by the nozzle 8, and the air collecting box 5 is connected to the nozzle 8 through a tapered pipe 6. The air collecting box 5 is communicated with the nozzle 8 through the tapered pipe 6. The thick-diameter end of the tapered pipe 6 is connected to the air collecting box 5, and the thin-diameter end of the tapered pipe 6 is connected to the nozzle 8.

[0019] The air flow in the air collecting box 5 enters the nozzle 8 through the tapered pipe 6 and is ejected through the nozzle 8, and the flow velocity of the air flow increases.

[0020] As Figure 3 And Figure 4 As shown, a plurality of air guide plates 9 are arranged in the air guide box 4, which are inclined towards the through hole 201 and arranged in sequence along the movement track of the through hole 201. The air guide plates 9 extend from the end of the dust pipe 16 close to the dust collector 2 towards the end of the dust pipe 16 far from the dust collector 2 in sequence along the dust gas transmission direction.

[0021] The flue gas is input into the air guide box 4 through the dust pipe 16, and the flue gas flows towards the through hole 201 communicated with the air guide box 4 in turn through the air guide plate 9.

[0022] As Figure 1 shown, a collecting hopper A10 is provided at the bottom of the dust removal box 1. The air guide box 4 is located between the dust collector 2 and the collecting hopper A10, and a discharge port A is opened at the bottom of the collecting hopper A10; a valve A11 for controlling the opening and closing of the discharge port A is provided at the discharge port A.

[0023] The dust falls into the dust removal box 1 and gradually gathers at the bottom of the collecting hopper A10, and then is discharged through the discharge port A.

[0024] As Figure 2 、 Figure 3 and Figure 4 shown, a collecting hopper B12 is provided at the bottom of the air guide box 4. A discharge port B is opened at the bottom of the collecting hopper B12; a valve B13 for controlling the opening and closing of the discharge port B is provided at the discharge port B.

[0025] The dust falls into the air guide box 4 and gradually gathers at the bottom of the collecting hopper B12, and then is discharged through the discharge port B.

[0026] As Figure 2 、 Figure 3 and Figure 4 shown, a scraper 14 is provided on the side of the air guide box 4 facing the dust collector 2, and the end of the scraper 14 away from the air guide box 4 is arranged in contact with the dust collector 2.

[0027] The scraper 14 cleans the side of the dust collector 2 facing the dust-containing area 101, and the dust on the dust collector 2 falls into the dust removal box 1 and the air guide box 4.

[0028] As Figure 3 shown, the scraper 14 is an annular structure extending along the opening direction of the air guide box 4, and the opening of the air guide box 4 is located inside the annular scraper 14.

[0029] The flue gas in the air guide box 4 passes through the scraper 14 and enters the channel.

[0030] As Figure 1 、 Figure 2 and Figure 4 shown, one end of the nozzle 8 facing the dust collector 2 is communicated with a flexible air duct 15. The end of the flexible air duct 15 away from the nozzle 8 is arranged in contact with the dust collector 2, and the end of the flexible air duct 15 away from the nozzle 8 intersects with the movement track of the through hole 201.

[0031] The air flow in the nozzle 8 passes through the flexible air duct 15 and the through hole 201 and enters the dust-containing area 101 to blow and clean the dust on the cloth bag air duct assembly 3.

[0032] A method for using a bag dust removal device for magnetized pyrolysis flue gas treatment comprises the following steps: a. The smoke is input into the air guide box 4 through the dust pipe 16, and the smoke flows toward the through hole 201 connected to the air guide box 4 through the air guide plate 9 in sequence; b. The smoke passes through the bag-type air duct assembly 3 and enters the air collecting box 5 to form a purified airflow, and the dust in the smoke is filtered on the side of the bag-type air duct assembly 3 facing the air guide box 4; c. The airflow in the air collecting box 5 passes through the cone tube 6 and enters the nozzle 8 and is ejected through the nozzle 8, and the flow velocity of the airflow increases; d. The airflow in the nozzle 8 passes through the flexible air duct 15 and the through hole 201 to enter the dust-containing area 101 and back-blow and clean the dust on the bag air cylinder assembly 3; e. The dust collector 2 rotates under the action of the airflow discharged from the air guide box 4 and / or the nozzle 8, and the airflow discharged from the nozzle 8 sequentially cleans the dust on the bag air cylinder assembly 3 on the dust collector 2; f. The scraper 14 cleans the side of the dust collector 2 facing the dust-containing area 101, and the dust on the dust collector 2 falls into the dust removal box 1 and the air guide box 4; g. The dust falls into the dust removal box 1 and gradually gathers at the bottom of the collecting hopper A10, and then is discharged through the discharge port A; h. The dust falls into the air guide box 4 and gradually gathers at the bottom of the collecting hopper B12, and then is discharged through the discharge port B; i. The airflow in the dusty area 101 passes through the through hole 201 away from the air guide box 4 and the nozzle 8 and enters the purification area 102, and the dust in the airflow is filtered by the bag air cylinder assembly 3 in the dusty area 101; j. The air flow in the purification area 102 is discharged through the clean air pipe 17.

[0033] During the actual production process, flue gas is input into the air duct 4 through the dust pipe 16. The flue gas is guided by the air guide plate 9 to pass through the scraper 14 and flow sequentially into the through hole 201 communicated with the air duct 4; the flue gas passes through the cloth bag air duct assembly 3 and enters the air collecting box 5 to form a purified air flow. The dust in the flue gas is filtered on the side of the cloth bag air duct assembly 3 facing the air duct 4; the air flow in the air collecting box 5 enters the nozzle 8 through the tapered pipe 6 and is ejected through the nozzle 8, and the flow velocity of the air flow increases; the air flow in the nozzle 8 passes through the flexible air duct 15 and the through hole 201 and enters the dust-containing area 101 to blow and clean the dust on the cloth bag air duct assembly 3; at the same time, the dust collector 2 rotates under the action of the air flow discharged from the air duct 4 and the nozzle 8, and the air flow discharged from the nozzle 8 blows and cleans the dust on the cloth bag air duct assembly 3 on the dust collector 2 in turn; the dust collector 2 rotates, and the bottom of the dust collector 2 passes through the scraper 14 in turn. The scraper 14 cleans the side of the dust collector 2 facing the dust-containing area 101, and the dust on the dust collector 2 falls into the dust removal box 1 and the air duct 4; the dust falls into the dust removal box 1 and gradually converges at the bottom of the aggregate hopper A10, and then is discharged through the discharge port A; the dust falls into the air duct 4 and gradually converges at the bottom of the aggregate hopper B12, and then is discharged through the discharge port B; the air flow in the dust-containing area 101 passes through the through hole 201 far from the air duct 4 and the nozzle 8 and enters the purification area 102, and the dust in the air flow is filtered by the cloth bag air duct assembly 3 in the dust-containing area 101; the air flow in the purification area 102 is discharged through the clean air pipe 17.

[0034] Certainly, the above description is not limited to the above examples. The technical features not described in the present invention can be realized by or adopted from the prior art, and will not be elaborated here; the above embodiments and drawings are only used to illustrate the technical solutions of the present invention and are not limitations on the present invention. The present invention has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention do not depart from the purpose of the present invention and should also fall within the scope of the protection of the claims of the present invention.

Claims

1. A bag dust removal device for treating magnetic pyrolysis flue gas, comprising a dust removal box (1), the dust removal box (1) being connected to a dusty air pipe (16) and a clean air pipe (17); characterized in that: A dust collector (2) is arranged inside the dust removal box (1), and the dust collector (2) divides the inner cavity of the dust removal box (1) into a dust-containing area (101) and a purification area (102), and the purification area (102) is connected to a clean air pipe (17); a plurality of through holes (201) are provided on the dust collector (2), and the dust-containing area (101) and the purification area (102) are connected through the through holes (201), and a bag air cylinder assembly (3) is arranged in the through holes (201); a dust-containing area (101) is provided in the dust removal box (101) and is connected to the dust air pipe (16); An air guide box (4) is provided with an air collecting box (5) and a nozzle (8) in the purification area (102); the openings of the air guide box (4) and / or the nozzle (8) are inclined toward the through hole (201), and the openings of the air guide box (4), the air collecting box (5), and the nozzle (8) respectively intersect with the movement trajectory of the through hole (201); the air guide box (4) and the air collecting box (5) are connected via the through hole (201), the air collecting box (5) and the nozzle (8) are connected, and the nozzle (8) is located at an end of the dust collector (2) away from the air collecting box (5).

2. The bag dust removal device for treating magnetic pyrolysis flue gas according to claim 1 is characterized in that: The number of through holes (201) that are simultaneously connected to the air guide box (4) and the air collection box (5) is greater than the number of through holes (201) that are simultaneously connected to the nozzle (8), and the air collection box (5) is transitionally connected to the nozzle (8) via the cone tube (6).

3. The bag dust removal device for treating magnetic pyrolysis flue gas according to claim 1 is characterized in that: A plurality of air guide plates (9) are arranged in a sequence along the movement trajectory of the through hole (201) and are inclined toward the through hole (201) in the air guide box (4). The air guide plates (9) extend in sequence along the dust transmission direction from one end of the dust pipe (16) close to the dust collector (2) toward one end of the dust pipe (16) far from the dust collector (2).

4. The bag dust removal device for treating magnetic pyrolysis flue gas according to claim 1 is characterized in that: A collecting hopper A (10) is provided at the bottom of the dust removal box (1), the air guide box (4) is located between the dust collector (2) and the collecting hopper A (10), and a discharge port A is provided at the bottom of the collecting hopper A (10).

5. The bag dust removal device for treating magnetic pyrolysis flue gas according to claim 1 is characterized in that: A material collecting hopper B (12) is provided at the bottom of the air guide box (4), and a material discharge port B is provided at the bottom of the material collecting hopper B (12).

6. The bag dust removal device for treating magnetic pyrolysis flue gas according to claim 1 is characterized in that: A scraper (14) is provided on one side of the air guide box (4) facing the dust collector (2), and an end of the scraper (14) away from the air guide box (4) is arranged in close contact with the dust collector (2).

7. The bag dust removal device for treating the magnetic pyrolysis flue gas according to claim 6 is characterized in that: The scraper (14) is an annular structure extending along the opening direction of the air guide box (4), and the opening of the air guide box (4) is located inside the annular scraper (14).

8. The bag dust removal device for treating magnetic pyrolysis flue gas according to claim 1 is characterized in that: One end of the nozzle (8) facing the dust collector (2) is connected to a flexible air duct (15), and one end of the flexible air duct (15) away from the nozzle (8) is arranged in close contact with the dust collector (2), and the end of the flexible air duct (15) away from the nozzle (8) intersects with the movement trajectory of the through hole (201).

9. A method for using the bag dust removal device for treating magnetic pyrolysis flue gas according to any one of claims 1 to 8, characterized in that: The following steps are involved: a. The smoke is introduced into the air guide box (4) through the dust pipe (16), and the smoke flows sequentially through the air guide plate (9) toward the through holes (201) connected to the air guide box (4); b. The flue gas passes through the bag-type air duct assembly (3) and enters the air collecting box (5) to form a purified air flow, and the dust in the flue gas is filtered on the side of the bag-type air duct assembly (3) facing the air guide box (4); c. The air flow in the air collecting box (5) passes through the conical tube (6) into the nozzle (8) and is ejected through the nozzle (8), and the flow velocity of the air flow increases; d. The airflow in the nozzle (8) passes through the flexible air guide tube (15) and the through hole (201) to enter the dust-containing area (101) and back-blow and clean the dust on the bag air cylinder assembly (3); e. The dust collector (2) rotates under the action of the air flow discharged from the air guide box (4) and / or the nozzle (8), and the air flow discharged from the nozzle (8) sequentially cleans the dust on the bag air cylinder assembly (3) on the dust collector (2); f. The scraper (14) cleans the side of the dust collector (2) facing the dust-containing area (101), and the dust on the dust collector (2) falls into the dust removal box (1) and the air guide box (4); g. The dust falls into the dust removal box (1) and gradually gathers at the bottom of the collecting hopper A (10), and is then discharged through the discharge port A; h. The dust falls into the air guide box (4) and gradually gathers at the bottom of the collecting hopper B (12), and is then discharged through the discharge port B; i. The airflow in the dust-containing area (101) passes through the through hole (201) away from the air guide box (4) and the nozzle (8) and enters the purification area (102), and the dust in the airflow is filtered by the bag air cylinder assembly (3) in the dust-containing area (101); j. The air flow in the purification zone (102) is discharged through the clean air pipe (17).

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