A bag filter device and method for magnetizing flue gas treatment

Abstract

The application relates to a cloth bag dust removal device and method for magnetized cracking flue gas treatment, which comprises a dust removal box, a dust gas pipe and a clean gas pipe communicated with the dust removal box; a dust remover is arranged in the dust removal box to separate the inner cavity of the dust removal box into a dust-containing area and a purification area, the purification area is communicated with the clean gas pipe; a plurality of through holes are arranged in the dust remover and communicated with the dust-containing area and the purification area, a cloth bag air duct assembly is arranged in the through holes; a wind guide box is arranged in the dust-containing area and communicated with the dust gas pipe, a wind collecting box and a nozzle are arranged in the purification area, the opening of the wind guide box and / or the nozzle is obliquely inclined towards the through hole, the opening of the wind guide box, the wind collecting box and the nozzle respectively intersects with the motion track of the through hole; the wind guide box and the wind collecting box are communicated through the through hole, the wind collecting box and the nozzle are communicated; the application guides the airflow to pass through the through hole back and forth through the wind guide box, the wind collecting box and the nozzle, the airflow drives the dust remover to rotate, the filtration of the flue gas and the back-blowing ash removal of the cloth bag air duct assembly are simultaneously completed, and the cost of dust removal is greatly saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cloth bag dust removal, and particularly relates to a cloth bag dust removal device and method for magnetized cracking flue gas treatment. BACKGROUND

[0002] With the enhancement of environmental awareness and the increase of garbage disposal demand, the magnetized cracking technology as a new type of garbage and solid waste disposal technology has broad development prospects; in the magnetized cracking process, organic matter is rapidly decomposed at low temperature, which can produce combustible gas, which can usually be used as fuel, but a large amount of dust and harmful gas is also produced in the magnetized cracking process, which causes the combustible gas to be unable to be directly used, and the flue gas produced by the magnetized cracking needs to be cleaned and purified.

[0003] And for the dust in the flue gas, the active carbon injection system and the cloth bag dust removal are usually combined, the active carbon injection device is used to inject active carbon to absorb various gas molecules and particulate matters, and the cloth bag dust removal is used to filter and capture the dust in the flue gas; but the cloth bag dust removal device usually uses the way of blowing the flue gas into the cloth bag, and the dust adheres to the surface of the cloth bag, which causes the cloth bag to be blocked and affects the dust removal efficiency; therefore, the back blowing mechanism is used to back blow the cloth bag dust removal device, but the existing back blowing mechanism usually uses the way of blowing the air into the cloth bag dust removal device in the reverse direction to clean, which greatly increases the cost of dust removal. SUMMARY

[0004] The present application provides a cloth bag dust removal device and method for magnetized cracking flue gas treatment, which can guide the air flow to pass through the through hole back and forth through the air guide box, the air collecting box and the nozzle, drive the dust remover to rotate through the air flow, and complete the filtration of the flue gas and the back blowing of the cloth bag air duct assembly at the same time, which greatly saves the cost of dust removal, and is simple, efficient, safe, reliable, easy to operate and the like.

[0005] This invention is achieved through the following technical solution: a baghouse dust collector for treating magnetized pyrolysis flue gas is provided, comprising a dust collector box, which is connected to a dust-laden gas pipe and a clean gas pipe; a dust collector is installed inside the dust collector box, and the dust collector divides the inner cavity of the dust collector box into a dust-laden area and a clean area, the clean area being connected to the clean gas pipe; the dust collector has several through holes, the dust-laden area and the clean area being connected through the through holes, and a baghouse air duct assembly is installed inside the through holes; an air guide box connected to the dust-laden gas pipe is installed in the dust-laden area, and a baghouse air duct assembly is installed in the clean area. The air collection box and nozzles, the air guide box and / or nozzle openings are inclined toward the through hole, and the openings of the air guide box, air collection box, and nozzles intersect the movement trajectory of the through hole respectively; the air guide box and air collection box are connected through the through hole, the air collection box and nozzles are connected, and the nozzles are located at the end of the dust collector away from the air collection box; the air guide box, air collection box and nozzles guide the airflow back and forth through the through hole, and the airflow drives the dust collector to rotate, while completing the filtration of flue gas and the back-blowing cleaning of the bag filter assembly, which greatly saves the cost of dust removal.

[0006] As an optimization, the number of through holes simultaneously connected to the air guide box and the air collection box is greater than the number of through holes connected to the nozzle, and the air collection box is connected to the nozzle through a tapered tube; the airflow velocity ejected from the nozzle is increased by reducing the flow cross section.

[0007] As an optimization, the air guide box is equipped with several inclined air guide plates that are arranged sequentially along the movement trajectory of the through holes. The air guide plates extend sequentially from the end of the dust gas pipe closest to the dust collector to the end of the dust gas pipe furthest from the dust collector along the dust gas transmission direction. The air guide plates deliver the flue gas to different through holes respectively, preventing uneven flue gas delivery to the corresponding through holes of the air guide box.

[0008] As an optimization, a collection hopper A is provided at the bottom of the dust collector box, and an air guide box is located between the dust collector and the collection hopper A. A discharge port A is provided at the bottom of the collection hopper A. Dust in the dust collector box is collected through the collection hopper A.

[0009] As an optimization, a hopper B is provided at the bottom of the air guide box, and a discharge port B is opened at the bottom of the hopper B; the dust in the air guide box is collected through the hopper B.

[0010] As an optimization, a scraper is provided on the side of the air guide box facing the dust collector, and the end of the scraper away from the air guide box is fitted to the dust collector; the scraper cleans the dust adhering to the side of the dust collector facing the dust-containing area.

[0011] As an optimization, the scraper is an annular structure extending along the opening direction of the air guide box, with the opening of the air guide box located inside the annular scraper; the scraper connects the air guide box and the through hole, reducing the leakage of flue gas conveyed by the air guide box toward the through hole.

[0012] As optimization, a flexible air guide pipe is communicated with the end of the nozzle towards the dust collector, the end of the flexible air guide pipe away from the nozzle is arranged in abutment with the dust collector, and the end of the flexible air guide pipe away from the nozzle intersects with the movement track of the through hole; the nozzle and the through hole are communicated through the flexible air guide pipe, so that leakage of flue gas transported by the nozzle towards the through hole is reduced.

[0013] A method for using a bag dust collector for magnetized cracking flue gas treatment, comprising the following steps:

[0014] a. Input flue gas into the air guide box through the dust gas pipe, and the flue gas flows towards the through hole communicated with the air guide box in sequence through the air guide plate;

[0015] b. The flue gas passes through the bag air duct assembly into the air collecting box and forms a completed purified gas flow, and the dust in the flue gas is filtered on the side of the bag air duct assembly towards the air guide box;

[0016] c. The gas flow in the air collecting box passes through the cone pipe into the nozzle and is sprayed out through the nozzle, and the flow speed of the gas flow is increased;

[0017] d. The gas flow in the nozzle passes through the flexible air guide pipe and the through hole into the dust-containing area and performs back blowing cleaning on the dust on the bag air duct assembly;

[0018] e. The dust collector rotates under the action of the gas flow discharged from the air guide box and / or the nozzle, and the gas flow discharged from the nozzle sequentially cleans the dust on the bag air duct assembly on the dust collector;

[0019] f. The scraper cleans the side of the dust collector towards the dust-containing area, and the dust on the dust collector falls into the dust collecting box and the air guide box;

[0020] g. The dust falls into the dust collecting box and gradually gathers at the bottom of the material collecting hopper A, and then is discharged through the discharge port A;

[0021] h. The dust falls into the air guide box and gradually gathers at the bottom of the material collecting hopper B, and then is discharged through the discharge port B;

[0022] i. The gas flow in the dust-containing area passes through the through hole away from the air guide box and the nozzle into the purification area, and the dust in the gas flow is filtered in the dust-containing area by the bag air duct assembly;

[0023] j. The gas flow in the purification area is discharged through the clean gas pipe.

[0024] The beneficial effects of the present application are: the air flow is guided to pass through the through hole back and forth by the air guide box, air collecting box and nozzle, the dust collector is driven to rotate by the air flow, and the filtration of flue gas and the back blowing of the bag dust cylinder assembly are completed at the same time, so that the cost of dust removal is greatly saved; the flow velocity of the air flow sprayed by the nozzle is increased by reducing the flow cross section; the flue gas is respectively delivered into different through holes by the air guide plate, so that the flue gas delivery of each through hole corresponding to the air guide box is prevented from being uneven; the dust attached to one side of the dust collector facing the dust-containing area is cleaned by the scraper, and the air guide box and the through hole are connected, so that the leakage of flue gas delivered by the air guide box to the through hole is reduced; the nozzle and the through hole are connected by the flexible air guide pipe, so that the leakage of flue gas delivered by the nozzle to the through hole is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is an internal structure diagram of the present application;

[0026] Figure 2 It is a connection diagram of the air guide box, dust collector, air collecting box and nozzle of the present application;

[0027] Figure 3 It is an internal structure diagram of the air guide box of the present application;

[0028] Figure 4 It is a flue gas flow diagram of the present application;

[0029] Shown in the figure:

[0030] 1, dust removal box, 2, dust collector, 3, bag dust cylinder assembly, 4, air guide box, 5, air collecting box, 6, cone pipe, 7, fixed ring, 8, nozzle, 9, air guide plate, 10, material collecting hopper A, 11, valve A, 12, material collecting hopper B, 13, valve B, 14, scraper, 15, flexible air guide pipe, 16, dust gas pipe, 17, clean gas pipe, 18, sealing ring, 19, oil, 101, dust-containing area, 102, purification area, 201, through hole. DETAILED DESCRIPTION

[0031] In order to clearly illustrate the technical features of the present application, the present application will be described below through specific embodiments.

[0032] As Figure 1 , Figure 2 and Figure 4The bag dust removal device for magnetized cracking flue gas treatment of the application shown, including dust removal box 1, dust removal box 1 is communicated with dust gas pipe 16 and clean gas pipe 17, dust removal box 1 is rotationally provided with dust remover 2, and dust remover 2 divides the inner cavity of dust removal box 1 into dust containing area 101 and purification area 102, purification area 102 is communicated with clean gas pipe 17, a plurality of through holes 201 are formed in dust remover 2, dust containing area 101 and purification area 102 are communicated through through holes 201, and bag dust removal assembly 3 is arranged in through holes 201, dust containing area 101 is provided with air guide box 4 communicated with dust gas pipe 16, purification area 102 is provided with air collecting box 5 and nozzle 8, the opening of air guide box 4 and / or nozzle 8 is obliquely directed to through holes 201, and the opening of air guide box 4, air collecting box 5 and nozzle 8 respectively intersects with the movement track of through holes 201, air guide box 4 and air collecting box 5 are communicated through through holes 201, air collecting box 5 is communicated with nozzle 8, and nozzle 8 is located at the end of dust remover 2 far away from air collecting box 5.

[0033] Dust removal box 1 is a cylindrical structure extending along the vertical direction, a fixed ring 7 extending along the vertical direction is fixedly arranged in dust removal box 1, dust remover 2 is coaxially rotationally arranged in fixed ring 7, and dust remover 2 and fixed ring 7 are connected through sealing ring 18, sealing ring 18 is sleeved on the flange part of dust remover 2, and sealing ring 18 is sequentially arranged along the vertical direction, oil 19 is filled between adjacent sealing rings 18, dust containing area 101 is located below dust remover 2, and purification area 102 is located above dust remover 2, the axis of through hole 201 is different from the rotation axis of dust remover 2, bag dust removal assembly 3 is a prior art, the opening of air guide box 4 and the opening of nozzle 8 are directed to the same side in through hole 201, the openings of air guide box 4 and air collecting box 5 cover the same number of through holes 201, and the opening of air collecting box 5 is located at the other end of the through hole 201 communicated by the opening of air guide box 4.

[0034] The flue gas is input into air guide box 4 through dust gas pipe 16, the flue gas flows towards the through hole 201 communicated by air guide box 4, the flue gas passes through bag dust removal assembly 3 and enters air collecting box 5 to form the airflow after purification, and the dust in the flue gas is filtered on the side of bag dust removal assembly 3 facing air guide box 4, the airflow in air collecting box 5 enters the through hole 201 communicated by the opening of nozzle 8 through nozzle 8 to perform back blowing cleaning on the dust on bag dust removal assembly 3, at the same time, dust remover 2 rotates under the action of the airflow discharged by air guide box 4 and nozzle 8, the airflow discharged in nozzle 8 sequentially performs back blowing cleaning on the dust on bag dust removal assembly 3 on dust remover 2, the dust falls on the bottom of dust removal box 1, at the same time, the airflow in dust containing area 101 passes through the through hole 201 far away from air guide box 4 and nozzle 8 and enters purification area 102, and the dust in the airflow is filtered in dust containing area 101 by bag dust removal assembly 3, and the airflow in purification area 102 is discharged through clean gas pipe 17.

[0035] As Figure 1 ,Figure 2 and Figure 4 The number of through holes 201 through which the air duct 4 and the air collecting box 5 simultaneously communicate is greater than the number of through holes 201 through which the nozzle 8 communicates, and the air collecting box 5 is connected through the taper pipe 6 and the nozzle 8; the air collecting box 5 is connected through the taper pipe 6 and the nozzle 8, and the thick end of the taper pipe 6 is connected to the air collecting box 5, and the thin end of the taper pipe 6 is connected to the nozzle 8.

[0036] The airflow in the air collecting box 5 enters the nozzle 8 through the taper pipe 6 and is sprayed out through the nozzle 8, and the flow speed of the airflow increases.

[0037] As shown in Figure 3 and Figure 4 The air duct 4 is provided with a plurality of air guide plates 9 inclined towards the through holes 201 and arranged in sequence along the movement track of the through holes 201, and the air guide plates 9 extend from the end of the dust gas pipe 16 close to the dust remover 2 to the end of the dust gas pipe 16 away from the dust remover 2 in sequence along the dust gas transmission direction.

[0038] The flue gas is input into the air duct 4 through the dust gas pipe 16, and the flue gas flows towards the through holes 201 of the air duct 4 through the air guide plates 9 in sequence.

[0039] As shown in Figure 1 The bottom of the dust removal box 1 is provided with a collecting hopper A 10, the air duct 4 is located between the dust remover 2 and the collecting hopper A 10, and the bottom of the collecting hopper A 10 is provided with a discharge port A; the discharge port A is provided with a valve A 11 for controlling the opening and closing of the discharge port A.

[0040] The dust falls into the dust removal box 1 and gradually gathers at the bottom of the collecting hopper A 10, and then is discharged through the discharge port A.

[0041] As shown in Figure 2 , Figure 3 and Figure 4 The bottom of the air duct 4 is provided with a collecting hopper B 12, and the bottom of the collecting hopper B 12 is provided with a discharge port B; the discharge port B is provided with a valve B 13 for controlling the opening and closing of the discharge port B.

[0042] The dust falls into the air duct 4 and gradually gathers at the bottom of the collecting hopper B 12, and then is discharged through the discharge port B.

[0043] As shown in Figure 2 , Figure 3 and Figure 4 The side of the air duct 4 facing the dust remover 2 is provided with a scraper 14, and the end of the scraper 14 away from the air duct 4 is attached to the dust remover 2.

[0044] The scraper 14 cleans the side of the dust remover 2 facing the dust-containing area 101, and the dust on the dust remover 2 falls into the dust removal box 1 and the air duct 4.

[0045] AsFigure 3 The scraper 14 is annular structure extending along the opening direction of the air guide box 4, and the opening of the air guide box 4 is located in the annular scraper 14.

[0046] The flue gas in the air guide box 4 passes through the scraper 14 into the channel.

[0047] As shown in Figure 1 , Figure 2 and Figure 4 The nozzle 8 is communicated with a flexible air guide pipe 15 at one end of the dust remover 2, and the other end of the flexible air guide pipe 15 is attached to the dust remover 2, and the other end of the flexible air guide pipe 15 intersects with the movement track of the through hole 201.

[0048] The airflow in the nozzle 8 passes through the flexible air guide pipe 15 and the through hole 201 into the dust-containing area 101 and performs back blowing cleaning on the dust on the bag dust cylinder assembly 3.

[0049] A use method of a bag dust removal device for magnetized cracking flue gas treatment, comprising the following steps:

[0050] a. Input the flue gas into the air guide box 4 through the dust gas pipe 16, and the flue gas flows towards the through hole 201 communicated with the air guide box 4 in sequence through the air guide plate 9;

[0051] b. The flue gas passes through the bag dust cylinder assembly 3 into the air collecting box 5 and forms a purified airflow, and the dust in the flue gas is filtered on the side of the bag dust cylinder assembly 3 towards the air guide box 4;

[0052] c. The airflow in the air collecting box 5 passes through the cone pipe 6 into the nozzle 8 and is sprayed out through the nozzle 8, and the flow speed of the airflow increases;

[0053] d. The airflow in the nozzle 8 passes through the flexible air guide pipe 15 and the through hole 201 into the dust-containing area 101 and performs back blowing cleaning on the dust on the bag dust cylinder assembly 3;

[0054] e. The dust remover 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 dust cylinder assembly 3 on the dust remover 2;

[0055] f. The scraper 14 cleans the side of the dust remover 2 towards the dust-containing area 101, and the dust on the dust remover 2 falls into the dust removal box 1 and the air guide box 4;

[0056] g. The dust falls into the dust removal box 1 and gradually gathers at the bottom of the material collecting hopper A 10, and then is discharged through the discharge port A;

[0057] h. The dust falls into the air guide box 4 and gradually gathers at the bottom of the material collecting hopper B 12, and then is discharged through the discharge port B;

[0058] i. The air flow in the dust-containing area 101 passes through the through hole 201 away from the air guide box 4 and the nozzle 8 into the purification area 102, and the dust in the air flow is filtered in the dust-containing area 101 by the bag dust collector assembly 3;

[0059] j. The air flow in the purification area 102 is discharged through the clean air pipe 17.

[0060] In the actual production process, the flue gas is input into the air guide box 4 through the dust gas pipe 16, the flue gas is guided to pass through the scraper 14 by the air guide plate 9 and flows into the through hole 201 connected to the air guide box 4 in turn; the flue gas passes through the bag dust collector assembly 3 into the air collecting box 5 and forms the air flow after complete purification, and the dust in the flue gas is filtered on the side of the bag dust collector assembly 3 facing the air guide box 4; the air flow in the air collecting box 5 passes through the cone pipe 6 into the nozzle 8 and is sprayed out through the nozzle 8, and the flow speed of the air flow is increased; the air flow in the nozzle 8 passes through the flexible air guide pipe 15 and the through hole 201 into the dust-containing area 101 and performs back-blowing cleaning on the dust on the bag dust collector 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, and the air flow discharged from the nozzle 8 performs back-blowing cleaning on the dust on the bag dust collector assembly 3 on the dust collector 2 in turn; the dust collector 2 rotates, 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 collecting box 1 and the air guide box 4; the dust falls into the dust collecting box 1 and gradually gathers at the bottom of the material collecting hopper A 10, and then is discharged through the discharge port A; the dust falls into the air guide box 4 and gradually gathers at the bottom of the material collecting hopper B 12, and then is discharged through the discharge port B; the air flow in the dust-containing area 101 passes through the through hole 201 away from the air guide box 4 and the nozzle 8 into the purification area 102, and the dust in the air flow is filtered in the dust-containing area 101 by the bag dust collector assembly 3; the air flow in the purification area 102 is discharged through the clean air pipe 17.

[0061] Of course, the above description is not limited to the above examples, and the technical features not described in the application can be realized by or using the prior art, which will not be described here; the above examples and drawings are only used to illustrate the technical solutions of the application and are not a limitation on the application, and the application has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that the changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the application do not deviate from the purpose of the application, and should also belong to the protection scope of the claims of the application.

Claims

1. A bag filter dust collector for treating magnetized pyrolysis flue gas, comprising a dust collector box (1), wherein the dust collector box (1) is connected to a dusty gas pipe (16) and a clean gas pipe (17); characterized in that: A dust collector (2) is installed inside the dust collection box (1), and the dust collector (2) divides the inner cavity of the dust collection box (1) into a dust-containing area (101) and a clean area (102). The clean area (102) is connected to the clean air pipe (17). Several through holes (201) are opened on the dust collector (2), and the dust-containing area (101) and the clean area (102) are connected through the through holes (201). A bag filter assembly (3) is installed in the through holes (201). The dust-containing area (101) is connected to the dust-air pipe (16). The air guide box (4) is provided with an air collection box (5) and a nozzle (8) in the purification zone (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 collection box (5), and the nozzle (8) intersect with the movement trajectory of the through hole (201) respectively. The air guide box (4) and the air collection box (5) are connected through the through hole (201), the air collection box (5) and the nozzle (8) are connected, and the nozzle (8) is located at the end of the dust collector (2) away from the air collection box (5).

2. The bag filter dust collector for treating magnetized pyrolysis flue gas according to claim 1, characterized in that: The number of through holes (201) connected to the air guide box (4) and the air collector box (5) is greater than the number of through holes (201) connected to the nozzle (8), and the air collector box (5) is connected to the nozzle (8) through a tapered tube (6).

3. The bag filter dust collector for treating magnetized pyrolysis flue gas according to claim 1, characterized in that: The air guide box (4) is provided with several air guide plates (9) that are inclined toward the through hole (201) and arranged in sequence along the movement trajectory of the through hole (201). The air guide plates (9) extend in sequence from the end of the dust pipe (16) close to the dust collector (2) toward the end of the dust pipe (16) away from the dust collector (2) along the dust gas transmission direction.

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

5. The bag filter dust collector for treating magnetized pyrolysis flue gas according to claim 1, characterized in that: The bottom of the air guide box (4) is provided with a material collection hopper B (12), and the bottom of the material collection hopper B (12) is provided with a discharge port B.

6. The bag filter dust collector for treating magnetized pyrolysis flue gas according to claim 1, characterized in that: The air guide box (4) is provided with a scraper (14) on the side facing the dust collector (2), and the end of the scraper (14) away from the air guide box (4) is fitted to the dust collector (2).

7. The bag filter dust collector for treating magnetized pyrolysis flue gas according to claim 6, 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 filter dust collector for treating magnetized pyrolysis flue gas according to claim 1, characterized in that: The nozzle (8) is connected to a flexible air guide pipe (15) at one end facing the dust collector (2). The flexible air guide pipe (15) is attached to the dust collector (2) at the other end away from the nozzle (8), and the movement trajectory of the flexible air guide pipe (15) away from the nozzle (8) intersects with that of the through hole (201).

9. A method of using a bag filter dust collector for treating magnetized pyrolysis flue gas according to any one of claims 1-8, characterized in that, Includes the following steps: a. Flue gas is introduced into the air box (4) through the dust pipe (16), and the flue gas flows through the air guide plate (9) in sequence toward the through hole (201) connected to the air box (4); b. The flue gas passes through the bag filter assembly (3) and enters the air collection box (5) to form a purified airflow. The dust in the flue gas is filtered on the side of the bag filter assembly (3) facing the air guide box (4). c. The airflow in the air collection box (5) enters the nozzle (8) through the cone tube (6) and is ejected through the nozzle (8), increasing the airflow velocity; d. The airflow in the nozzle (8) passes through the flexible air guide tube (15) and the through hole (201) into the dust-laden area (101) and back-blowing cleans the dust on the bag filter assembly (3); e. The dust collector (2) rotates under the action of the airflow discharged from the air guide box (4) and / or nozzle (8), and the airflow discharged from the nozzle (8) cleans the dust on the bag air duct assembly (3) on the dust collector (2) in sequence. 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 collection box (1) and the air guide box (4); g. Dust falls into the dust collector (1) and gradually accumulates at the bottom of the collecting hopper A (10), and is then discharged through the discharge port A; h. Dust falls into the air guide box (4) and gradually gathers at the bottom of the collection hopper B (12), and then is discharged through the discharge port B; i. The airflow in the dust-laden 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). The dust in the airflow is filtered into the dust-laden area (101) by the bag air duct assembly (3). j. The airflow in the purification zone (102) is discharged through the purification pipe (17).

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