A sectional type pulse dust cleaning bag type dust collector

Abstract

This utility model belongs to the technical field of baghouse dust collectors, and particularly relates to a segmented pulse-jet baghouse dust collector. A segmented pulse-jet baghouse dust collector includes a housing, a dust hopper, a tube sheet, filter bags and filter bag supports, a blowpipe installed inside the housing above the tube sheet, and a pulse-jet cleaning control device connected to the inlet of the blowpipe. A cleaning assembly is installed on the blowpipe directly above each filter bag. The cleaning assembly includes a guide pipe with its lower end inserted into the lower part of the filter bag and multiple sets of air jet pipes fixedly connected axially to the guide pipe. The upper end of the guide pipe is fixedly connected to the blowpipe, and the guide pipe and the blowpipe are in communication. The two ends of the air jet pipes are respectively connected to the interior of the guide pipe and the inner cavity of the filter bag; the lower end of the guide pipe is a sealed structure. This utility model is applicable to ultra-long filter bags, provides good cleaning uniformity, thorough and stable cleaning, and can improve the service life of the filter bags.

Description

Technical Field

[0001] This utility model belongs to the technical field of bag filter dust collectors, and in particular relates to a segmented pulse cleaning bag filter dust collector. Background Technology

[0002] The traditional pulse jet baghouse dust collector mainly consists of a housing, filter bags, filter bag support frames, tube sheet, air manifold, pulse solenoid valves, blowpipes, a controller, a discharge valve, and a dust hopper. The working process of a traditional pulse jet baghouse dust collector is as follows: Dust-laden airflow enters the dust hopper and flows upwards. As it passes through the filter bags, the dust is intercepted, and clean air enters the housing and exits. When the resistance of the filter bags increases, the pulse system is activated, and compressed air is blown through the blowpipes to blow the filter bags, causing the dust to fall into the dust hopper. Finally, the dust is discharged by the discharge valve.

[0003] In traditional pulse-jet baghouse dust collectors, the cleaning airflow flows downwards from the filter bag opening through a jet pipe. For example, Chinese invention patent application number 201310504158.8 discloses a pulse-jet cleaning device for a baghouse dust collector, and Chinese utility model patent publication number CN217795077U discloses a similar device. However, existing pulse-jet baghouse dust collector cleaning devices have the following drawbacks: 1. Poor uniformity of dust removal, incomplete dust removal at the bottom. The downward-flowing cleaning airflow gradually weakens due to gravity and filter bag resistance, resulting in excessive airflow energy at the upper part of the filter bag (near the bag opening), which can easily lead to over-cleaning (and even damage to the filter bag fibers), while the lower part (near the dust hopper end) lacks sufficient kinetic energy to effectively remove the accumulated dust layer. Over time, this will cause dust to continuously accumulate at the bottom of the filter bag, leading to a rapid increase in resistance and a decrease in filtration efficiency.

[0004] 2. Easily leads to secondary dust adsorption. During dust removal, dust needs to fall off the surface of the filter bag and fall into the dust hopper. The downward airflow of the dust removal is in the same direction as the natural fall of the dust. However, after the airflow reaches the lower part of the filter bag, it is easy to form a "reverse vortex" above the dust hopper. This blows up the dust that has fallen to the inlet of the dust hopper and causes it to re-attach to the lower surface of the filter bag, aggravating secondary pollution and reducing the dust removal effect.

[0005] 3. Increased wear and tear on filter bags, leading to a shorter lifespan. The filter bag needs to rely on the filter bag keel to maintain its shape. The downward airflow for cleaning will exert continuous downward pressure on the filter bag, especially for long filter bags (such as those with a length > 6m). This can easily lead to a smaller gap between the bottom of the filter bag and the filter bag keel, and increased friction. If the bottom of the filter bag is loosely fitted with the filter bag keel, the airflow impact may also cause the bottom of the filter bag to "shake", accelerating the mechanical wear of the filter bag edges or bottom, and increasing the risk of filter bag damage.

[0006] 4. Airflow distribution is easily disturbed, affecting filtration stability. During normal operation of the dust collector, the dust-laden airflow enters the middle chamber (filter chamber) from the lower chamber (ash hopper area) upwards, creating an "airflow collision" with the downward cleaning airflow at the bottom of the filter bags, which can easily generate local eddies. These eddies disrupt the normal filtration airflow trajectory, not only interfering with dust interception but also potentially causing unfiltered dust-laden airflow to directly enter the clean air chamber, resulting in "ash leakage" and reducing purification efficiency.

[0007] 5. Poor adaptability to sticky dust. For sticky dust, the downward cleaning airflow is unlikely to completely "blow off" the dust adhering to the bottom of the filter bag. Instead, due to insufficient airflow energy, the dust may form a "compacted layer" at the bottom of the filter bag. Utility Model Content

[0008] To address at least one technical problem existing in the prior art, this application provides a segmented pulse cleaning bag filter that is applicable to ultra-long filter bags, has good uniformity of dust removal, thorough and stable dust removal, and can improve the service life of filter bags.

[0009] To achieve the above objectives, this utility model provides the following technical solution: A segmented pulse-jet baghouse dust collector includes a housing, a dust hopper at the lower end of the housing, a tube sheet inside the housing, multiple sets of filter bags and filter bag supports on the tube sheet, a blowpipe inside the housing above the tube sheet, and a pulse-jet cleaning control device connected to the inlet of the blowpipe. A cleaning assembly is installed on the blowpipe directly above each filter bag. The cleaning assembly includes a guide pipe with its lower end inserted into the lower part of the filter bag and multiple sets of air jets fixedly connected axially to the guide pipe. The upper end of the guide pipe is fixedly connected to the blowpipe, and the guide pipe communicates with the blowpipe. The two ends of the air jets are respectively connected to the interior of the guide pipe and the inner cavity of the filter bag; the lower end of the guide pipe is a sealed structure.

[0010] Preferably, each group of jet pipes has multiple jet pipes evenly distributed on the circumference of the guide pipe axis.

[0011] Preferably, an equalizing ring is fixedly connected to the outer end of each group of jet pipes, each jet pipe is connected to the inner cavity of the equalizing ring, and multiple ventilation holes are evenly distributed on the equalizing ring.

[0012] Preferably, the vent holes are inclined toward the inner wall of the filter bag.

[0013] Preferably, the vent holes include an upper vent hole obliquely upward toward the inner wall of the filter bag and a lower vent hole obliquely downward toward the inner wall of the filter bag.

[0014] Preferably, the upper vent and the lower vent are arranged alternately.

[0015] Preferably, a threaded sleeve with internal threads is fixedly connected to the jet pipe directly above each filter bag, and the upper end of the guide pipe is threaded into the threaded sleeve.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This invention improves the uniformity of dust removal by incorporating a guide pipe and an air jet pipe. The guide pipe is inserted inside the filter bag, and multiple sets of air jet pipes are arranged along its length. This allows for thorough cleaning of the filter bag's lower surface. Furthermore, because the air jet pipes can spray towards the inner wall of the filter bag, the cleaning airflow is less likely to generate a reverse vortex above the dust hopper, preventing dust that has already detached from the filter bag from being blown up again and re-adhering to the lower surface, thus avoiding secondary pollution and reduced cleaning efficiency. Additionally, because the air jet pipes can spray towards the inner wall of the filter bag, the cleaning airflow does not exert continuous downward pressure on the filter bag, reducing the risk of damage caused by long-term airflow impact. Moreover, the cleaning airflow is less likely to collide with the dust-laden airflow to create localized vortices, thus avoiding reduced purification efficiency and preventing the formation of a "compacted layer" of dust at the bottom of the filter bag.

[0017] The uniformity of the blowing of the filter bag is further improved by setting an air distribution ring and vent holes; the guide pipe is conveniently fixed and installed on the blowing pipe by setting a threaded sleeve on the blowing pipe and an external thread on the guide pipe. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the connection structure between the blowpipe and the dust removal assembly of this utility model.

[0020] Figure 3 This is a partial structural diagram of the single-unit dust removal component of this utility model.

[0021] Figure 4 This is a top view of the single-unit dust removal assembly of this utility model.

[0022] In the diagram: 1. Housing, 11. Filter chamber, 12. Purification chamber, 13. Air outlet duct. 2. Ash hopper, 21. Air inlet pipe, 22. Ash outlet pipe 3. Perforated plate; 31. Through hole in the perforated plate. 4. Pulse jet pipe, 41. Pulse jet main pipe, 5. Pulse cleaning control device; 51. Pulse solenoid valve; 52. Air tank; 53. Controller. 6. Filter bags 7. Filter bag frame, 8. Dust removal assembly; 81. Guide pipe; 82. Jet pipe; 83. Air distribution ring; 831. Vent hole; 832. Upper vent hole; 833. Lower vent hole; 84. Threaded sleeve. 9. Ash discharge valve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0025] See appendix Figure 1 As shown, a segmented pulse cleaning bag filter includes a housing 1, a dust hopper 2, a tube sheet 3, a blowpipe 4, a pulse cleaning control device 5, filter bags 6, filter bag frames 7, a cleaning assembly 8, and a dust discharge valve 9.

[0026] The ash hopper 2 is fixedly connected to the lower opening of the box body 1 and the two are sealed together. The inner cavities of the box body 1 and the ash hopper 2 are connected, and the upper end of the box body 1 has a sealed structure.

[0027] An air inlet pipe 21 is installed at the upper part of the ash hopper 2, through which gas carrying dust enters the ash hopper 2. An ash discharge pipe 22 is installed at the lower part of the ash hopper 2, and an ash discharge valve 9 is installed on the ash discharge pipe 22. When the ash discharge valve 9 is open, the dust in the ash hopper 2 can be discharged from the ash hopper 2 through the ash discharge pipe 22. When the ash discharge valve 9 is closed, the dust in the ash hopper 2 cannot be discharged from the ash hopper 2 through the ash discharge pipe 22.

[0028] A perforated plate 3 is horizontally fixedly connected to the upper part of the housing 1. The edge of the perforated plate 3 is sealed and fixedly connected to the inner wall of the housing 1, so that dust cannot enter the area above the perforated plate 3 through the gap between the perforated plate 3 and the inner wall of the housing 1. Multiple perforated plate through holes 31 are provided on the perforated plate 3. The perforated plate through holes 31 can be evenly distributed in multiple rows on the perforated plate 3, with multiple holes evenly distributed in each row.

[0029] At the lower end of the tube sheet 3 at each tube sheet through hole 31, a corresponding filter bag support 7 is fixedly connected in the vertical direction. Filter bags 6 are fixedly installed on the outside of the filter bag support 7. The filter bag support 7 is used to support the filter bags 6 and maintain their structural shape. The dust gas entering the ash hopper 2 through the air inlet pipe 21 can only enter the inner cavity of the filter bags 6 through the air holes on the filter bags 6 under the action of wind pressure, and then enter the area above the tube sheet 3 through the tube sheet through hole 31. Thus, a filtration chamber 11 is formed below the tube sheet 3, and a purification chamber 12 is formed above the tube sheet 3.

[0030] An air outlet pipe 13 is fixedly connected to one end of the box 1 above the tube sheet 3. One end of the air outlet pipe 13 is connected to the inner cavity of the box 1 and the other end can be directly connected to the outside, or it can be connected to the existing subsequent gas purification equipment. The gas filtered by the filter bag 6 is discharged from the box 1 through the air outlet pipe 13.

[0031] A blowpipe 4 is fixedly connected inside the box 1 above each row of filter bags 6 and the corresponding tube sheet through hole 31. A blowpipe through hole corresponding to each row of filter bags 6 is opened at the lower end of each blowpipe 4. Figure 1 As shown, the right ends of the multiple blow pipes 4 are sealed, and their left ends can be connected and converge into the blow main pipe 41.

[0032] The pulse cleaning control device 5 includes a pulse solenoid valve 51 whose outlet is connected to the inlet of the main blow pipe 41. The inlet of the pulse solenoid valve 51 is connected to the outlet of the air tank 52, which stores compressed air. Additionally, it includes a controller 53 electrically connected to the pulse solenoid valve 5. The inlet of the air tank 52 is connected to external compressed air. The controller 53 can control the periodic opening and closing of the pulse solenoid valve 51, causing compressed air to be blown into the filter bag 6 through the air tank 52, the pulse solenoid valve 5, the main blow pipe 41, the blow pipe 4, and the blow pipe through-hole, thereby blowing off the dust adhering to the outer surface of the filter bag 6.

[0033] A dust removal assembly is installed on the blowpipe directly above each filter bag. The dust removal assembly includes a guide pipe with its lower end inserted into the lower part of the filter bag and multiple sets of air jet pipes fixedly connected to the guide pipe along its axial direction. The upper end of the guide pipe is fixedly connected to the blowpipe, and the guide pipe and the blowpipe are connected. The two ends of the air jet pipe are respectively connected to the inside of the guide pipe and the inner cavity of the filter bag.

[0034] In this embodiment, a dust removal component 8 is provided on the blowpipe 4 directly above each filter bag 6.

[0035] See Figure 2 , 3 As shown in Figure 4, the dust removal assembly 8 includes a guide pipe 81 with its lower end inserted into the lower part of the filter bag and multiple sets of air jet pipes 82 fixedly connected to the guide pipe 81 along its axial direction. The upper end of the guide pipe 81 is fixedly connected to the blow pipe 4, and the inner cavity of the guide pipe 81 is connected to the blow pipe 4. The two ends of the air jet pipes 82 are respectively connected to the inside of the guide pipe 81 and the inner cavity of the filter bag 6.

[0036] Since the diameter of the guide pipe 81 is limited by the inner diameter of the filter bag 6, in order to make the high-pressure gas sprayed from the paint spray pipe 82 in the guide pipe 81 spray the filter bag 6 more evenly, multiple sets of air spray pipes 82 are evenly distributed on the circumference of the guide pipe 81. In this embodiment, three sets of air spray pipes 82 are evenly distributed, and four sets of air spray pipes 82 are arranged along the axial direction of the guide pipe 81. Of course, the length of the guide pipe 81 and the corresponding number of sets of air spray pipes 82 can be adapted according to the length of the filter bag 6.

[0037] In addition, in order to avoid damage to the filter bag 6 and the generation of eddies during the blowing process, which would result in incomplete dust removal, the lower end of the guide pipe 81 is sealed in this embodiment, that is, the air in the guide pipe 81 can only be ejected from the jet pipe 82.

[0038] The working principle and process of this embodiment are as follows: Dust-laden gas enters the ash hopper 2 through the inlet pipe 21 and flows upward. The clean gas, filtered by the filter bag 6, enters the purification chamber 12 and then exits the housing 1 through the outlet pipe 13. During this process, the ash discharge valve 9 is closed. When the dust on the filter bag 6 is detected and identified by existing technology such as differential pressure sensor as reaching the preset cleaning conditions, the controller 53 of the pulse cleaning control device 5 controls the pulse solenoid valve 51 to open and close periodically, so that compressed air enters the blow pipe 4 through the air manifold 52 and the blow pipe 41. The high-pressure gas in the blow pipe 4 enters each guide pipe 81 and blows the filter bag 6 through the jet pipe 82, causing the dust on the filter bag 6 to fall off and enter the ash hopper 2. Finally, the ash discharge valve 9 is opened to discharge the dust.

[0039] With the above structure, since the guide pipe 81 is inserted into the filter bag 6 and multiple sets of jet pipes 82 are arranged along the length of the guide pipe 81, the uniformity of dust removal is improved by spraying the filter bag 6 through the jet pipes 82, and the dust removal at the bottom of the filter bag is more thorough. Since the jet pipes 82 can spray towards the inner wall of the filter bag 6, the sprayed dust removal airflow is less likely to generate a reverse vortex above the dust hopper 2, thereby avoiding the dust that has fallen off the filter bag 6 from being blown up again and re-attached to the lower surface of the filter bag 6, thus avoiding secondary pollution and reducing the dust removal effect. In addition, since the jet pipes 82 can spray towards the inner wall of the filter bag 6, the dust removal airflow will not exert continuous downward pressure on the filter bag 6, reducing the risk of damage to the filter bag 6 caused by long-term airflow impact. Furthermore, in this embodiment, the dust removal airflow is less likely to collide with the dust-laden airflow to generate local vortices, thereby reducing the purification efficiency, and it is less likely to cause the dust to form a "compacted layer" at the bottom of the filter bag 6. Example 2

[0040] See Figure 2 , 3As shown in Figure 4, this embodiment is a further improvement on embodiment 1. Compared with embodiment 1, this embodiment further includes a gas equalization ring 83. A gas equalization ring 83 is fixedly connected to the outer end of each group of jet pipes 82 by welding. The gas equalization ring 83 is a circular hollow structure. The inner cavity of each jet pipe 82 is connected to the inner cavity of the gas equalization ring 83, and multiple ventilation holes 831 are evenly distributed on the gas equalization ring 83.

[0041] Therefore, the cleaning air in the guide pipe 81 is sprayed onto the inner wall of the filter bag 6 through the jet pipe 82, the air equalization ring 83, and the air vent 831, thereby further improving the uniformity of the spraying onto the filter bag 6 based on Example 1.

[0042] Furthermore, in order to further improve the uniformity of the blowing of the filter bag 6, the vent hole 831 is inclined toward the inner wall of the filter bag 6. The vent hole 831 includes an upper vent hole 832 inclined upward toward the inner wall of the filter bag 6 and a lower vent hole 833 inclined downward toward the inner wall of the filter bag 6. The upper vent hole 832 and the lower vent hole 833 are arranged alternately.

[0043] The working principle and process of this embodiment are as follows: Dust-laden gas enters the ash hopper 2 through the inlet pipe 21 and flows upward. The clean gas, filtered by the filter bag 6, enters the purification chamber 12 and then exits the housing 1 through the outlet pipe 13. During this process, the ash discharge valve 9 is in the closed state. When the dust on the filter bag 6 is detected and identified by existing technology such as differential pressure sensor as reaching the preset cleaning conditions, the controller 53 of the pulse cleaning control device 5 controls the pulse solenoid valve 51 to open and close periodically, so that compressed air enters the blow pipe 4 through the air manifold 52 and the blow pipe 41. The high-pressure gas in the blow pipe 4 enters each guide pipe 81 and blows the filter bag 6 through the air jet pipe 82, the air distribution ring 83, and the ventilation hole 831, causing the dust on the filter bag 6 to fall off and enter the ash hopper 2. Finally, the ash discharge valve 9 is opened to discharge the dust. Example 3

[0044] See Figure 2 As shown, this embodiment is a further improvement on embodiment 2. In this embodiment, to facilitate the fixed installation of the guide pipe 81 on the spray pipe 4, a threaded sleeve 84 is fixedly connected to the spray pipe 4 at the spray pipe through hole. The threaded sleeve 84 can be coaxially arranged with the spray pipe through hole and the two are connected. The threaded sleeve 84 has an internal thread, and the upper part of the guide pipe 81 is provided with an external thread that matches the internal thread of the threaded sleeve 84. Thus, the guide pipe 81 can be threadedly connected to the threaded sleeve 84.

[0045] The working principle and process of this embodiment are the same as those of Embodiment 2, and will not be repeated here. Example 4

[0046] This embodiment is a further improvement on embodiment 3. In this embodiment, the diameter of the guide pipe 81 gradually decreases from near to far from the pulse solenoid valve 51 to ensure that the airflow is evenly distributed to each guide pipe 81.

[0047] The working principle and process of this embodiment are the same as those of Embodiment 3, and will not be repeated here.

[0048] It should be noted that the innovation of this utility model lies in the specific structure of the dust removal component 8 and the connection method and relative position between it and the blow pipe 4 and the filter bag 6. Other components are existing technologies and will not be described in detail here.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A segmented pulse-jet baghouse dust collector, comprising a housing, a dust hopper disposed at the lower end of the housing, a tube sheet disposed within the housing, multiple sets of filter bags and filter bag supports disposed on the tube sheet, a blowpipe disposed within the housing above the tube sheet, and a pulse-jet cleaning control device connected to the inlet of the blowpipe, characterized in that: A dust removal assembly is provided on the blowpipe directly above each filter bag. The dust removal assembly includes a guide pipe with its lower end inserted into the lower part of the filter bag and multiple sets of air jet pipes fixedly connected to the guide pipe along its axial direction. The upper end of the guide pipe is fixedly connected to the blowpipe and the guide pipe is connected to the blowpipe. The two ends of the air jet pipes are respectively connected to the inside of the guide pipe and the inner cavity of the filter bag. The lower end of the guide pipe is a sealed structure.

2. The segmented pulse cleaning bag filter according to claim 1, characterized in that: Each group of jet pipes has multiple jet pipes evenly distributed around the circumference of the guide pipe axis.

3. The segmented pulse cleaning bag filter according to claim 2, characterized in that: A gas equalization ring is fixedly connected to the outer end of each group of jet pipes, and each jet pipe is connected to the inner cavity of the gas equalization ring. Multiple air vents are evenly distributed on the gas equalization ring.

4. The segmented pulse cleaning bag filter according to claim 3, characterized in that: The vent holes are angled toward the inner wall of the filter bag.

5. The segmented pulse cleaning bag filter according to claim 4, characterized in that: The ventilation holes include an upper ventilation hole that is angled upward toward the inner wall of the filter bag and a lower ventilation hole that is angled downward toward the inner wall of the filter bag.

6. The segmented pulse cleaning bag filter according to claim 5, characterized in that: The upper and lower vents are arranged alternately.

7. The segmented pulse cleaning bag filter according to claim 1, characterized in that: A threaded sleeve with internal threads is fixedly connected to the jet pipe directly above each filter bag, and the upper end of the guide pipe is threaded into the threaded sleeve.

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