Integrated cloth bag dust removal device for sintering machine cigarette end gas circulation

Abstract

The invention relates to the technical field of dust removal equipment, in particular to a sintering machine cigarette end gas circulation integrated bag dust removal device, which comprises: dust removal box equipment, which comprises a dust removal box body, the top end of the dust removal box body is provided with two upper cover plates which are oppositely opened and closed, and the back surface of the dust removal box body is provided with a purified gas outlet for discharging gas; the dust collection part comprises a dust pouring frame hopper fixed at the bottom end of the dust removal box body, and the bottom end of the dust pouring frame hopper is connected with a dust hopper. A separation part composed of the outer conical cylinder and the inner cyclone cylinder is arranged above the ash bucket, coarse particle dust in dust-containing flue gas is thrown to the inner wall of the outer conical cylinder under the action of strong centrifugal force and falls into the bottom of the ash bucket along the spiral flow guide groove, primary purification can be completed without additionally arranging a cyclone dust collector, and the dust removal efficiency is improved. Most of coarse particles are captured and separated before contacting with the filter bag, so that high-speed impact and cutting wear of coarse particle dust entering a filtering part on the surface of the dust removal filter bag are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of dust removal equipment technology, and in particular to an integrated bag filter dust collector for circulating flue gas from sintering machines. Background Technology

[0002] In the steel smelting process, the sintering process is one of the main stages that generates dust and waste gas. The flue gas at the head of the sintering machine is characterized by high dust concentration, coarse particles, large temperature fluctuations, and high humidity. Furthermore, with the promotion of flue gas recycling technology, a large amount of low-temperature and high-humidity gas has been mixed into the circulating flue gas, further exacerbating the operational difficulties of the dust removal system.

[0003] Currently, bag filters are commonly used as the final purification equipment for dust removal of sintering flue gas. However, existing technologies have the following drawbacks in practical applications: Severe filter bag wear and short service life: The flue gas at the head of the sintering machine contains a large amount of dust, including a significant amount of coarse dust particles. When traditional baghouse dust collectors directly treat this type of flue gas, the high-speed impact of coarse particles on the filter bag surface causes severe localized wear, leading to frequent filter bag breakage and increased maintenance costs and replacement frequency. Significant condensation and bag clogging issues, resulting in high operating resistance: The temperature of the sintering flue gas flues considerably, especially after the introduction of circulating flue gas. The flue gas temperature decreases while the humidity increases, making it highly susceptible to condensation on the filter bag surface. This leads to dust adhesion and caking, resulting in bag clogging. Clogging reduces the filter bag's permeability, drastically increases system resistance, increases energy consumption, and may even require system shutdown for cleaning. Therefore, a baghouse dust collector integrating flue gas recirculation for sintering machines is needed to solve these problems. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A bag filter dust collector for circulating flue gas from a sintering machine includes: A dust collection box device includes a dust collection box body, the top of which is provided with two opposing upper cover plates, and the back of the dust collection box body is provided with a clean air outlet for air discharge. The dust collection part includes a dust collection frame hopper fixed to the bottom of the dust collector body. The bottom of the dust collection frame hopper is connected to a dust hopper, the front of the dust hopper is connected to a dust gas inlet, and the bottom of the dust hopper is equipped with a dust outlet valve. The separation section includes an outer cone that is rotatably installed at the bottom of the ash-pouring frame hopper. An inner vortex cylinder is provided inside the outer cone cylinder. A spiral blade shaft is connected to the center of the top of the inner vortex cylinder. A drive device is connected to the shaft end of the spiral blade shaft. The filtration section includes a grid base fixed to the inner wall of the ash collection hopper. The bottom center of the grid base is rotatably connected to the top of the inner vortex tube. The top of the grid base is provided with a bottom support frame fixed to the inner wall of the dust collector. A limiting frame plate is suspended above the bottom support frame. A filter bag frame is inserted into the limiting frame plate through a through hole. A dust collector filter bag is inserted into the filter bag frame. A filter bag pressure plate is pressed onto the top of the dust collector filter bag.

[0006] Preferably, the diameter of the outer surface of the inner vortex tube gradually increases from top to bottom, the lower edge of the inner vortex tube has a horn-shaped curved structure, and the surface of the inner vortex tube is provided with upwardly inclined nozzles.

[0007] Preferably, the outer cone is designed as an inverted frustum, and an annular flow channel is formed between the outer cone and the inner vortex cylinder.

[0008] Preferably, a hot exhaust gas inlet controlled by a solenoid valve is provided on the right side of the bottom of the ash hopper for drawing hot exhaust gas from the tail of the sintering machine.

[0009] Preferably, a pad frame is connected to the top of the inner wall of the dust collector, and a rubber ring sealing plate for sealing the top of the dust collector is installed on the surface of the pad frame. Two frame seats are arranged opposite each other at the top of the dust collector, and a clamping strip that fits onto the surface of the upper cover plate is inserted horizontally through the two frame seats.

[0010] Preferably, a rubber ring is provided at the top edge of the filter bag frame, and the rubber ring is attached to the surface of the limiting frame plate and the top ring of the dust collector filter bag; a plurality of through grooves are provided around the side of the filter bag frame, and an opening with a diameter smaller than that of the dust collector filter bag is provided at the bottom of the filter bag frame.

[0011] Preferably, the back of the dust collector is also provided with an observation window for observing the internal condition of the dust collector.

[0012] Preferably, the driving device is a variable frequency motor, and the bottom end of the spiral blade shaft passes through the end of the pipe of the ash outlet valve through a sleeve and then connects with the shaft end of the variable frequency motor.

[0013] Preferably, the dust collector housing is further provided with a pulse unit for cleaning the filter part by jet blowing. The pulse unit includes a support fixed to the outside of the dust collector housing, an air tank installed at the top of the support, an electromagnetic pulse valve installed at the top of the air tank, and a jet pipe laid at the top of the inside of the dust collector housing connected to the opening of the electromagnetic pulse valve. The surface of the jet pipe is provided with a plurality of diversion jet pipes adapted to the position of the dust collector filter bag.

[0014] This invention has at least the following beneficial effects: 1. This invention features a separation section above the dust hopper, consisting of an outer cone and an inner cyclone. Coarse dust particles in the dust-laden flue gas are thrown against the inner wall of the outer cone under strong centrifugal force and fall into the bottom of the dust hopper along the spiral guide groove. This achieves primary purification without the need for an additional cyclone dust collector. Most coarse particles are captured and separated before contacting the filter bag, significantly reducing the high-speed impact and abrasive wear of the dust collector filter bag surface caused by coarse dust particles entering the filtration section. It provides effective protection, especially for the vulnerable area at the bottom of the filter bag, significantly extending the overall service life of the dust collector filter bag and reducing the frequency of filter bag replacement and maintenance costs.

[0015] 2. This invention features a hot exhaust gas inlet at the bottom of the ash hopper to introduce high-temperature, dry hot exhaust gas from the tail of the sintering machine. When treating the sintering machine head flue gas mixed with low-temperature, high-humidity circulating flue gas, the bottom of the rotating inner vortex acts like an impeller, forcibly drawing the hot exhaust gas from the bottom of the ash hopper into the inner vortex and ejecting it at high speed through upward-sloping nozzles on its surface. This achieves intense turbulent mixing of the hot exhaust gas and the main flue gas, instantly raising the temperature of the mixed gas above the dew point and significantly reducing the relative humidity. This fundamentally eliminates the possibility of water vapor condensation on the filter bag surface, effectively preventing dust adhesion and caking, avoiding a sharp increase in system resistance and energy consumption, ensuring the long-term stable operation of the dust removal system, and preventing downtime for cleaning losses due to bag caking.

[0016] 3. The upward-sloping nozzles densely distributed on the surface of the inner cyclone tube in this invention form a rotating, porous, three-dimensional airflow distributor under normal filtration conditions. This ensures uniform distribution of flue gas entering the filtration area, avoiding problems such as excessive local filter bag load and airflow erosion caused by traditional air intake methods. During pulse cleaning, the rotation of the inner cyclone tube and the jet flow from the nozzles create a downward air curtain effect on the settling dust, accelerating the dust's fall into the ash hopper. This improves cleaning efficiency, reduces secondary dust generation, and avoids the problems of high equipment investment, high system resistance, and large footprint associated with adding cyclone dust collectors, heaters, or complex air distribution devices to achieve a single purpose. This achieves comprehensive benefits of equipment simplification and energy reduction. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the external structure of an integrated bag filter dust collector for sintering machine flue gas circulation proposed in this invention. Figure 2This is a schematic diagram of the external top view of an integrated bag filter dust collector for sintering machine flue gas circulation proposed in this invention. Figure 3 This is a schematic diagram of the internal disassembly structure of an integrated bag filter dust collector for sintering machine flue gas circulation proposed in this invention. Figure 4 This is a schematic diagram of the internal cross-sectional structure of an integrated bag filter dust collector for sintering machine flue gas circulation proposed in this invention. Figure 5 This is a schematic diagram of the cross-sectional connection structure between the ash collection part and the separation part in an integrated bag dust collector for sintering machine flue gas circulation proposed in this invention. Figure 6 This is a schematic diagram of the disassembly structure of the ash-pouring frame hopper and the grid base in an integrated bag dust collector for sintering machine flue gas circulation proposed in this invention. Figure 7 This is a three-dimensional structural diagram of the separation section in an integrated bag filter dust collector for sintering machine flue gas circulation proposed in this invention. Figure 8 This is a three-dimensional disassembly diagram of the filter section in an integrated bag filter for sintering machine flue gas circulation proposed in this invention. Figure 9 This is a three-dimensional structural diagram of the pulse section in an integrated bag filter dust collector for sintering machine flue gas circulation proposed in this invention.

[0019] In the picture: 1. Dust collector box equipment; 11. Dust collector box body; 12. Clean air outlet; 13. Top cover plate; 14. Clamping strip; 15. Frame base; 16. Observation window; 17. Gasket frame; 18. Rubber ring sealing plate; 2. Ash collection point; 21. Ash hopper; 22. Ash hopper; 23. Dust and gas inlet; 24. Hot waste gas inlet; 25. Ash outlet valve; 3. Separation section; 31. Sleeve; 32. Spiral blade shaft; 33. Variable frequency motor; 34. Inner vortex cylinder; 35. Outer cone cylinder; 4. Filter section; 41. Filter base; 42. Base support frame; 43. Filter bag frame; 44. Limiting frame plate; 45. Dust collector filter bag; 46. Filter bag pressure plate; 5. Pulse section; 51. Support; 52. Air tank; 53. Electromagnetic pulse valve; 54. Pulse jet pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Overall structural features of the equipment: Reference Figures 1-9 A bag filter dust collector for circulating flue gas from a sintering machine, comprising: Dust collection box equipment 1 includes a dust collection box body 11, with two opposing upper cover plates 13 at the top of the dust collection box body 11, a clean air outlet 12 for air discharge installed on the back of the dust collection box body 11, and an observation window 16 for observing the internal condition of the dust collection box body 11 on the back of the dust collection box body 11. The ash collection part 2 includes an ash pouring frame 21 fixed to the bottom of the dust collector 11, an ash hopper 22 connected to the bottom of the ash pouring frame 21, a dust and gas inlet 23 connected to the front of the ash hopper 22, and an ash outlet valve 25 installed at the bottom of the ash hopper 22. The separation part 3 includes an outer cone 35 rotatably mounted on the bottom end of the ash pouring frame hopper 21. An inner vortex 34 is provided inside the outer cone 35, and a spiral blade shaft 32 is connected at the center of the top end of the inner vortex 34. A drive device is connected to the shaft end of the spiral blade shaft 32. The filtration section 4 includes a grid base 41 fixed to the inner wall of the ash hopper 21. The bottom center of the grid base 41 is rotatably connected to the top of the inner vortex cylinder 34. A bottom support frame 42 is provided at the top of the grid base 41 and is fixed to the inner wall of the dust collector 11. A limiting frame plate 44 is suspended above the bottom support frame 42 and is fixed to the inner wall of the dust collector 11 on the side. A filter bag frame 43 is inserted and installed inside the limiting frame plate 44 through a through hole. A dust collector filter bag 45 is inserted and installed inside the filter bag frame 43. A filter bag pressure plate 46 is pressed and installed at the top of the dust collector filter bag 45 and is fixed to the inner wall of the dust collector 11 on the side by bolts.

[0022] The driving device is a variable frequency motor 33. The bottom end of the spiral blade shaft 32 passes through the end of the ash outlet valve 25 via the sleeve 31 and then connects with the shaft end of the variable frequency motor 33.

[0023] A pad frame 17 is connected to the top of the inner wall of the dust collector 11, and a rubber ring sealing plate 18 for sealing the top of the dust collector 11 is installed on the surface of the pad frame 17. Two frame seats 15 are arranged opposite each other at the top of the dust collector 11. A clamping strip 14 is inserted horizontally through the inside of the two frame seats 15, and the clamping strip 14 is attached to the surface of the upper cover plate 13.

[0024] The opening inside the ash hopper 21 changes from a square opening to a round opening from top to bottom, which is used to collect the dust and debris that falls off the filter bag frame 43.

[0025] A hot exhaust gas inlet 24, controlled by a solenoid valve, is also provided on the right side of the bottom of the ash hopper 22 to draw hot exhaust gas from the tail of the sintering machine.

[0026] The outer cone 35 is designed as an inverted frustum, and an annular flow channel is formed between the outer cone 35 and the inner vortex cylinder 34.

[0027] The diameter of the outer surface of the inner swirling cylinder 34 gradually increases from top to bottom. The lower edge of the inner swirling cylinder 34 has a trumpet-shaped curved structure design, and the surface of the inner swirling cylinder 34 has upward-sloping nozzles.

[0028] A rubber ring is provided at the top edge of the filter bag frame 43, and the rubber ring is attached to the surface of the limiting frame plate 44 and the top ring of the dust removal filter bag 45.

[0029] The filter bag frame 43 has several through slots around its sides, and the bottom of the filter bag frame 43 has an opening with a diameter smaller than that of the dust collector filter bag 45, which is used to provide hollow support for the dust collector filter bag 45.

[0030] The dust collector housing 11 is also equipped with a pulse unit 5 for impacting the filter part 4. The pulse unit 5 includes a support 51 fixed on the outside of the dust collector housing 11. An air tank 52 is installed at the top of the support 51, and an electromagnetic pulse valve 53 is installed at the top of the air tank 52. A blow pipe 54 is connected to the opening of the electromagnetic pulse valve 53. The blow pipe 54 is laid at the top inside the dust collector housing 11. Several branch nozzles are provided on the surface of the blow pipe 54. Each branch nozzle is adapted to the dust collector filter bag 45.

[0031] The following descriptions, using multiple examples, are provided separately to aid understanding: Example 1: like Figures 1-3 As shown, the device comprises four core modules: dust collection box 1, dust collection section 2, separation section 3, and filtration section 4.

[0032] The dust collection box 1 serves as the main body of the clean air chamber of the device, including a hollow dust collection box 11, with two opposing opening and closing top covers 13 on its top, and a clean air outlet 12 and an observation window 16 installed on its back.

[0033] The ash collection section 2 is located at the bottom of the device and includes an ash-pouring frame 21 fixed to the bottom of the dust collector 11, with an ash hopper 22 and an ash outlet valve 25 connected below it in sequence. The ash hopper 22 has a dust gas inlet 23 connected to its front side for introducing the main flue gas to be treated. A hot waste gas inlet 24 is opened on the right side of the bottom of the ash hopper 22. This inlet is controlled by a solenoid valve and is used to draw high-temperature, dry hot waste gas from the tail end or cooling section of the sintering machine.

[0034] The separation section 3 enables the device to achieve multiple functions in linkage. This structure includes an outer cone 35 rotatably installed at the bottom of the ash hopper 21, and an inner vortex cylinder 34 coaxially arranged inside the outer cone 35. The outer cone 35 is a stationary part with an overall inverted frustum design. Its inner wall has a spiral guide groove, which can also be a smooth surface as shown in the figure. The inner vortex cylinder 34 is a moving part with its outer surface diameter gradually increasing from top to bottom. The lower edge has a horn-shaped curved structure design. The surface of the inner vortex cylinder 34 is densely covered with multiple upward-sloping nozzles, which are used as secondary air nozzles. A spiral blade shaft 32 is connected to the center of the top of the inner vortex cylinder 34. The bottom end of the spiral blade shaft 32 passes through the end of the ash outlet valve 25 through the sleeve 31 and is connected to the shaft end of the variable frequency motor 33. The inner vortex cylinder 34 is rotatably connected to the outer cone 35 through a bearing. Its bottom extends into the ash hopper 22, and its top opening is connected to the filter section 4 above through the grid base 41.

[0035] The filtration section 4 achieves fine filtration, including a grid base 41 fixed to the inner wall of the ash hopper 21, the center of its bottom end being rotatably connected to the top of the inner vortex cylinder 34. Above the grid base 41, a bottom support frame 42, a limiting frame plate 44, and multiple filter bag frames 43 and dust removal filter bags 45 inserted and installed in the limiting frame plate 44 are arranged in sequence. The top of the filter bags is pressed and sealed by the filter bag pressure plate 46.

[0036] At work, such as Figures 4-9 As shown, the dust-laden flue gas enters tangentially from the dust inlet 23 into the space above the ash hopper 22 and below the outer cone 35. The variable frequency motor 33 drives the spiral blade shaft 32 to rotate, causing the inner cyclone tube 34 to rotate at high speed inside the outer cone tube 35. When the flue gas enters the annular space between the outer cone tube 35 and the inner cyclone tube 34, it is forced to form a high-speed rotating airflow. Under the action of strong centrifugal force, coarse dust particles are thrown towards the inner wall of the outer cone tube 35 and fall into the bottom of the ash hopper 22 along the spiral guide groove on the inner wall. This achieves centrifugal pre-dust removal without the need for an additional cyclone dust collector, significantly reducing the coarse dust particles entering the filter bag from the source and effectively solving the problem of filter bag wear.

[0037] The flue gas containing fine particles, which has been pre-separated by centrifugation, and the high-temperature hot exhaust gas introduced from the hot exhaust gas inlet 24, will be further mixed and distributed by the rotation of the inner vortex tube 34 in the subsequent process, and finally enter the filtration section 4 upwards, and the clean gas is discharged through the clean gas outlet 12.

[0038] Example 2: Based on Example 1, this embodiment focuses on solving the problem of condensation and bag clogging caused by low-temperature and high-humidity flue gas through structural linkage.

[0039] like Figure 3 and Figure 4As shown, when processing the sintering machine head flue gas mixed with a large amount of low-temperature and high-humidity circulating flue gas, the equipment control system monitors the flue gas status through temperature and humidity sensors. This is existing technology and will not be described in detail. Once the flue gas temperature is detected to be lower than the dew point threshold or the humidity is too high, the control system automatically opens the solenoid valve of the hot exhaust gas inlet 24 to introduce the high-temperature and dry hot exhaust gas from the tail of the sintering machine into the bottom of the ash hopper 22.

[0040] At this time, the rotating inner vortex tube 34 comes into play. The bottom of the inner vortex tube 34 extends into the ash hopper 22, and its rotation is similar to that of a paddle wheel or impeller. It forces the hot exhaust gas at the bottom of the ash hopper 22 into the inner vortex tube 34. The hot exhaust gas that is drawn in flows upward inside the tube and is finally ejected at high speed through the upward-sloping nozzles opened on the wall of the inner vortex tube 34.

[0041] This process achieves multiple technical effects: First, forced mixing and heating: the hot exhaust gas ejected from the nozzle and the cold main flue gas, which may be relatively humid after preliminary dust removal, form a violent turbulent mixing in a narrow space before entering the filtration section 4. This instantly raises the temperature of the mixed gas above the dew point and significantly reduces its relative humidity, fundamentally eliminating the possibility of water vapor condensing on the surface of the filter bag and completely solving the stubborn problem of condensation and bag clogging.

[0042] Secondly, it prevents dust accumulation and is self-cleaning. The jet airflow continuously washes the surrounding walls, preventing dust from accumulating on the upper part of the ash hopper and the outer wall of the inner vortex tube, thus having a good dust-prevention effect.

[0043] Example 3: This embodiment is a further explanation based on Embodiment 1 or 2.

[0044] like Figures 2-7 As shown, the upward-sloping nozzles densely distributed on the wall of the inner vortex tube 34 are not limited to spraying hot air. Under normal filtration conditions, these nozzles form a rotating, porous, three-dimensional airflow distributor. The airflow ejected from the nozzles, whether it is the mixed main flue gas or hot exhaust gas, can enter the ash hopper 21 and the filtration section 4 evenly. This makes the flue gas flow rate and velocity distribution into each dust collector filter bag 45 more uniform, avoiding problems such as excessive local filter bag load and airflow scouring and wear caused by traditional air intake methods, and significantly extending the service life of the entire batch of dust collector filter bags 45.

[0045] In addition, when the pulse section 5 performs pulse cleaning of the filter bags, the control system can briefly adjust the speed or operating mode of the variable frequency motor 33. The centrifugal force field generated by the high-speed rotation of the inner cyclone cylinder 34, as well as the high-speed airflow ejected from the nozzle, will form a downward air curtain or dust suppression effect on the dust cloud that has just detached from the dust collector filter bag 45 and is still in the settling process, accelerating the settling of the dust to the bottom of the ash hopper 22 and preventing it from being recaptured by adjacent filter bags. This improves the cleaning efficiency, reduces secondary dust, and integrates the functions of air intake, air distribution, conditioning and auxiliary cleaning into one unit. This avoids the problems of large equipment investment, high system resistance and large footprint caused by adding cyclone dust collectors, heaters or complex air distribution devices to achieve a single purpose.

[0046] Example 4: This embodiment describes the auxiliary structure of the device based on any one of embodiments one to three.

[0047] like Figures 1-8 As shown, the top of the dust collector 11 is designed with a reliable sealing structure. A gasket 17 is connected to the top of the inner wall of the dust collector 11. A rubber ring sealing plate 18 is installed on the surface of the gasket 17. Two frame seats 15 are arranged opposite each other at the top of the dust collector 11. A clamping strip 14 is inserted horizontally through the inside of the two frame seats 15. The clamping strip 14 is tightly attached to the surface of the closed upper cover plate 13 to ensure that the top cover will not leak under high negative pressure operation conditions.

[0048] A rubber ring is provided at the top edge of the filter bag frame 43 to ensure airtightness between the filter bag opening and the limiting frame plate 44. Several through grooves are opened around the side of the filter bag frame 43, and an opening with a diameter smaller than that of the dust collector filter bag 45 is opened at the bottom end. This maximizes the filtration area and dust removal effect while ensuring the support strength.

[0049] The support 51 of the pulse section 5 is fixed to the outside of the dust collector 11. An air tank 52 is installed at the top of the air tank 52. An electromagnetic pulse valve 53 is installed at the top of the air tank 52. The opening of the electromagnetic pulse valve 53 is connected to a blow pipe 54 laid inside the top of the dust collector 11. The surface of the blow pipe 54 is provided with multiple diversion nozzles that are adapted to the position of the dust collector filter bag 45. When the system resistance increases, the electromagnetic pulse valve 53 opens, and high-pressure gas is instantly injected into the dust collector filter bag 45, causing the dust collector filter bag 45 to expand and vibrate, shaking off the dust.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A bag filter dust collector for circulating flue gas from a sintering machine, characterized in that, include: The dust collection box equipment (1) includes a dust collection box body (11), the top of which is provided with two upper cover plates (13) that open and close in opposite directions, and the back of the dust collection box body (11) is provided with a clean air outlet (12) for air discharge. The dust collection part (2) includes a dust collection frame (21) fixed at the bottom of the dust collection box (11), the bottom of the dust collection frame (21) is connected to a dust hopper (22), the front of the dust hopper (22) is connected to a dust inlet (23), and the bottom of the dust hopper (22) is equipped with a dust outlet valve (25). The separation part (3) includes an outer cone (35) rotatably installed at the bottom of the ash hopper (21), an inner vortex cylinder (34) is provided inside the outer cone (35), a spiral blade shaft (32) is connected at the center of the top of the inner vortex cylinder (34), and a drive device is connected to the shaft end of the spiral blade shaft (32). The filtration section (4) includes a grid base (41) fixed to the inner wall of the ash hopper (21). The bottom center of the grid base (41) is rotatably connected to the top of the inner vortex tube (34). The top of the grid base (41) is provided with a bottom support frame (42) fixed to the inner wall of the dust collector (11). A limiting frame plate (44) is suspended above the bottom support frame (42). A filter bag frame (43) is inserted and installed inside the limiting frame plate (44) through a through hole. A dust collector filter bag (45) is inserted and installed inside the filter bag frame (43). A filter bag pressure plate (46) is pressed and installed on the top of the dust collector filter bag (45).

2. The integrated bag filter dust collector for sintering machine flue gas recirculation as described in claim 1, characterized in that, The outer surface diameter of the inner swirling cylinder (34) gradually increases from top to bottom. The lower edge of the inner swirling cylinder (34) has a horn-shaped curved structure design. The surface of the inner swirling cylinder (34) is provided with upward-sloping spray holes.

3. The integrated bag filter dust collector for sintering machine flue gas recirculation as described in claim 1, characterized in that, The outer cone (35) is designed as an inverted frustum, and an annular flow channel is formed between the outer cone (35) and the inner vortex cylinder (34).

4. The integrated bag filter dust collector for sintering machine flue gas recirculation as described in claim 1, characterized in that, The bottom right side of the ash hopper (22) is also provided with a hot exhaust gas inlet (24) controlled by a solenoid valve, which is used to draw hot exhaust gas from the tail of the sintering machine.

5. A bag filter dust collector for sintering machine flue gas recirculation as described in claim 1, characterized in that, The top of the inner wall of the dust collector (11) is connected to a pad frame (17). The surface of the pad frame (17) is covered with a rubber ring sealing plate (18) for sealing the top of the dust collector (11). Two frame seats (15) are arranged opposite each other at the top of the dust collector (11). The two frame seats (15) are horizontally inserted through the interior of the two frame seats (15) and are fitted with a clamping strip (14) that fits the surface of the upper cover plate (13).

6. A bag filter dust collector for sintering machine flue gas recirculation as described in claim 1, characterized in that, A rubber ring is provided at the top edge of the filter bag frame (43), and the rubber ring is attached to the surface of the limiting frame plate (44) and the top ring of the dust removal filter bag (45); a number of through grooves are provided around the side of the filter bag frame (43), and an opening with a diameter smaller than that of the dust removal filter bag (45) is provided at the bottom of the filter bag frame (43).

7. A bag filter dust collector for sintering machine flue gas recirculation as described in claim 1, characterized in that, The dust collector (11) is also provided with an observation window (16) on the back for observing the internal condition of the dust collector (11).

8. A bag filter dust collector for sintering machine flue gas recirculation as described in claim 1, characterized in that, The driving device is a variable frequency motor (33). The bottom end of the spiral blade shaft (32) passes through the end of the ash outlet valve (25) through the sleeve (31) and then connects with the shaft end of the variable frequency motor (33).

9. A bag filter dust collector for sintering machine flue gas recirculation as described in claim 1, characterized in that, The dust collector housing (11) is also provided with a pulse part (5) for cleaning the filter part (4) by jet blowing. The pulse part (5) includes a support (51) fixed on the outside of the dust collector housing (11). An air bag (52) is installed at the top of the support (51). An electromagnetic pulse valve (53) is installed at the top of the air bag (52). A jet pipe (54) is connected to the opening of the electromagnetic pulse valve (53) and is laid at the top of the inside of the dust collector housing (11). Several diversion jet pipes adapted to the position of the dust filter bag (45) are provided on the surface of the jet pipe (54).

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