A pulse bag filter

Abstract

This utility model relates to a pulsed bag filter dust collector, which includes a filter chamber and connected air inlet system, air outlet system, dust removal system, and dust conveying system. The filter chamber is divided into an upper space and a lower space by a tube sheet. Multiple filter cartridges with their bodies placed in the lower space are connected to the tube sheet. The outer side of each filter cartridge is the filtration working surface. The internal space of each filter cartridge communicates with the upper space through its upper opening. Each filter cartridge includes a frame and a filter bag covering the frame. The filter bag is made of woven fiberglass fabric. The frame consists of 6-10 vertical ribs and several ring ribs. The air outlet system includes a first duct connected to the filter chamber, with an air outlet valve on the first duct. The dust removal system includes a second duct connected to the filter chamber, with a pulsed valve on the second duct. The pulsed valve pulses repeatedly and alternately opens and closes with the air outlet valve to achieve pulsed dust removal of the filter bags. This pulsed bag filter dust collector not only has a good cleaning effect on easily absorbing moisture and caking inorganic salts, but also prevents filter bag damage.

Description

Technical Field

[0001] This utility model relates to the field of dust collectors, and in particular to a pulsed bag dust collector. Background Technology

[0002] Currently, new projects in enterprises are imposing increasingly stringent emission requirements on drying and dust removal units. The emission concentration of inorganic salt particles is generally limited to 20-30 mg / Nm3. Therefore, existing dust removal equipment such as cyclone dust collectors, water bath dust collectors, and settling chamber dust collectors cannot meet these requirements, necessitating the use of baghouse dust collectors. Existing baghouse dust collectors mainly include external filter pulse jet baghouse dust collectors and internal filter reverse-flushing vibrating baghouse dust collectors. However, for inorganic salts that easily absorb moisture and caking, such as potassium chloride, potassium sulfate, potassium nitrate, sodium chloride, sodium sulfate, magnesium chloride, and magnesium sulfate, the following drawbacks exist during dust removal:

[0003] (1) External pulse jet baghouse dust collector: First, the air wave from the pulse jet absorbs heat from the surrounding environment as it expands, causing the temperature around the air wave to drop below the dew point. Moisture-absorbing materials will clump on the filter bags, or even cause them to become caked, making long-term operation difficult in northern winters. Second, ordinary needle-punched felt and non-woven fabric membrane filter bags are subject to excessive deformation due to the impact force of the air wave (0.4-0.6MPa), causing the membrane on the filter cloth to rupture and resulting in material trapping in the filter bag substrate. Primary and secondary dust absorb moisture and clump together, gradually increasing the dust collector resistance and making cleaning difficult and prone to damage. Fiberglass woven fabric filter bags are easily damaged under the impact of the air wave, resulting in a very short filter bag lifespan.

[0004] (2) Internal filter back-blowing machine vibrating bag dust collector: The dust is cleaned by constant pressure back-blowing and vibrating the filter bag. However, for materials that are prone to moisture absorption, the primary dust accumulates during the dust removal process, which causes secondary dust to clump together and become difficult to clean. When the thickness of the secondary dust reaches the limit, the secondary dust falls off as a whole inside the filter bag, causing the bottom of the filter bag to become blocked by bridging. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a pulsed bag filter dust collector, which not only has a good cleaning effect on easily absorbing moisture and caking inorganic salts, but also makes the filter bags less prone to damage.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0007] A pulsed bag filter includes a filter chamber and an air inlet system, an air outlet system, a dust removal system and a dust conveying system connected thereto.

[0008] The filter chamber is divided into an upper space and a lower space by a perforated plate. The air outlet system and dust removal system are connected to the upper space, and the air inlet system and dust conveying system are connected to the lower space. Multiple filter cartridges with cylindrical bodies placed in the lower space are connected to the perforated plate. The outer side of the filter cartridge is the filtration working surface. The internal space of the filter cartridge is connected to the upper space through its upper opening. The filter cartridge includes a frame and a filter bag covering the frame. The filter bag is made of glass fiber woven fabric. The frame is composed of 6-10 vertical ribs and several ring ribs. The multiple vertical ribs are evenly distributed along the circumference of the frame.

[0009] The air outlet system includes a first air duct connected to the filter chamber, the first air duct being connected to the main exhaust fan, and an air outlet valve installed on the first air duct; the dust removal system includes a second air duct connected to the filter chamber, the second air duct being connected to the back blower, and a pulsating valve installed on the second air duct. The pulsating valve pulsates multiple times and alternately opens and closes with the air outlet valve to achieve pulsating dust removal of the filter bags. When the distance between adjacent vertical ribs is d, the pulsating stroke of the filter bag dust removal is L = (0.15-0.4)d.

[0010] Preferably, multiple filter chambers are connected in parallel, and the air intake system includes an air intake main pipe. The diameter of the air intake main pipe decreases gradually along the air intake direction. Each air intake main pipe corresponding to each diameter level is connected to a filter chamber through an air intake branch pipe to achieve pressure equalization of air intake.

[0011] Preferably, the lower part of the filter chamber is a constriction section, the body of the filter cartridge is placed in the lower space above the constriction section, the slope of the constriction section is provided with an air inlet connected to the air inlet system, the bottom of the constriction section is provided with a discharge port, and the discharge port is provided with a double-flip sealed unloader connected to the dust conveying system.

[0012] Preferably, the air outlet valve and the pulse valve alternately open and close 3-5 times, which is sufficient to effectively clean the dust off the filter bag.

[0013] Preferably, the filter chamber corresponding to the lower space is also provided with an inspection manhole; the filter chamber corresponding to the upper space is provided with a maintenance door at the top.

[0014] Preferably, the dust conveying system includes a discharge pipe connected to the filter chamber, and the discharge pipe is connected to a conveying device.

[0015] Preferably, the backflush air volume of the filter chamber is 1.1-4 times the air intake air volume of the filter chamber, and the backflush air pressure of the filter chamber is 1.5-3.5 times the air intake air pressure of the filter chamber.

[0016] Preferably, the pulsating valve is located near the filter chamber.

[0017] The advantages of this utility model using the above-mentioned technical solution are: the pulsating bag dust collector, through the design of the filter cartridge frame and filter bag, and by setting the pulsating valve to pulsate multiple times and alternately opening and closing with the outlet valve, achieves better pulsating dust removal of the filter bag, which not only has a better dust removal effect, but also does not easily damage the filter bag. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0019] Figure 2 for Figure 1 A top view of the filter cartridge under the pulsating valley state of the filter bag;

[0020] Figure 3 for Figure 1 A top view of the filter cartridge under peak pulsation conditions;

[0021] Figure 4 for Figure 2 and Figure 3 A schematic diagram of the structure of filter bags in two states placed together;

[0022] Figure 5 for Figure 1 A schematic diagram of one of the structures of the central air intake duct and the air intake branch duct.

[0023] In the diagram, 1. Filter chamber, 2. Air inlet system, 3. Air outlet system, 4. Dust removal system, 5. Dust conveying system; 11. Tube sheet, 12. Filter cartridge, 13. Upper space, 14. Lower space, 15. Double-flip sealed unloader, 16. Inspection manhole, 17. Maintenance door; 21. Main air inlet duct, 22. Branch air inlet duct; 31. First air duct, 32. Main exhaust fan, 33. Air outlet valve, 41. Second air duct, 43. Pulsating valve; 121. Frame, 122. Filter bag. Detailed Implementation

[0024] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application; however, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] like Figure 1-5 As shown, in this embodiment, the pulsating bag filter includes a filter chamber 1 and connected to it an air inlet system 2, an air outlet system 3, a dust removal system 4, and a dust conveying system 5.

[0027] The filter chamber 1 is divided into an upper space 13 and a lower space 14 by a tube sheet 11. The air outlet system 3 and the dust removal system 4 are connected to the upper space 13, and the air inlet system 2 and the dust conveying system 5 are connected to the lower space 14. Multiple filter cartridges 12 with their bodies placed in the lower space are connected to the tube sheet 11. The outer side of the filter cartridge 12 is the filtration working surface. The internal space of the filter cartridge 12 is connected to the upper space 13 through its upper opening. The filter cartridge 12 includes a frame 121 and a filter bag 122 covering the frame 121. The filter bag 122 is made of glass fiber woven fabric. The frame 121 is composed of 6-10 vertical ribs and several ring ribs. The multiple vertical ribs are evenly distributed along the circumference of the frame.

[0028] The air outlet system 3 includes a first air duct 31 connected to the filter chamber 1. The first air duct 31 is connected to the main exhaust fan 32. An air outlet valve 33 is provided on the first air duct 31. The dust removal system 4 includes a second air duct 41 connected to the filter chamber 1. The second air duct 41 is connected to the back blower 42. A pulse valve 43 is provided on the second air duct 41. The pulse valve 43 pulses multiple times and alternately opens and closes with the air outlet valve 33 to achieve pulse dust removal of the filter bag 122. When the distance between adjacent vertical ribs is d, the pulse stroke L of the filter bag dust removal is (0.15-0.4)d. The dust removal effect is best when there are 6-10 vertical ribs. If there are too many vertical ribs, the pulse stroke (L) of the filter bag is small, which is not conducive to dust removal. If there are too few vertical ribs, the pulse stroke (L) of the filter bag is too large, the filter bag is easily damaged, and the pit and groove material retention effect is aggravated, resulting in poor dust removal effect.

[0029] Dust removal process: The outer side of the filter bag 122 of the dust collector of the present invention is the filtration working surface. During dust removal, the pulse valve 43 is in the closed state and the air outlet valve 33 is in the open state. The gas to be removed is introduced into the filter chamber 1 through the air inlet system 2. The gas is first filtered by the filtration working surface of the filter bag 122 and enters the filter bag. Then it enters the upper space from the filter bag and is guided to the chimney by the air outlet system 3, thus completing the gas dust removal work.

[0030] Dust removal process: The pulsating operation of the dust collector of this invention is achieved by the pulsating valve 43 pulsating multiple times in coordination with the outlet valve 33. When the pulsating valve 43 is open and pulsating, the outlet valve 33 is closed. At this time, the filter bag 122 is under positive pressure, and secondary dust is discharged from the outside of the filter bag 122. This is the peak pulsation point. Figure 3 When the pulsation valve 43 is closed, the air outlet valve 33 is opened. At this time, the filter bag 122 is under negative pressure and the filter bag 122 is in a contracted state. This is the pulsation trough value. Figure 2 The pulse valve 43 pulses multiple times, working in conjunction with the outlet valve 33 and the filter bag 122 to complete one pulse peak and trough value, which constitutes one pulse cleaning cycle. The number of pulse cleaning cycles can be determined based on the difficulty of cleaning the material. Actual tests show that inorganic salt products such as potassium chloride, potassium sulfate, and sodium sulfate often contain magnesium chloride. During dust removal, magnesium chloride easily absorbs moisture and transforms into dihydrate or hexahydrate magnesium chloride, which tends to accumulate in the primary dust. This makes it difficult to completely remove secondary dust in one pulse cleaning cycle, requiring multiple pulse cleaning cycles. Generally, after 3-5 pulse cleaning cycles, the secondary dust is basically removed. The fallen dust is handled and transported by the dust conveying system.

[0031] The pulsating valve, an existing component, is a special valve used to convert continuous fluid flow into periodic, pulsating flow. It can be used in two ways: one is by using a shut-off valve with a position controller, removing excess blades and remaking two opposing blades. Rotation at a certain speed achieves pulsating airflow, and stopping at a specific position shuts off the airflow. The other method uses a regular air valve, achieving pulsating airflow through frequent opening and closing at a certain speed (valve core rotation switch). Multiple pulsations from the pulsating valve indicate multiple pulsating actions within a cycle, forming a pulsating airflow. This pulsating airflow helps to shake and clean the filter bags. Switching between the pulsating valve and the outlet valve further agitates the filter bags, and the combination of both makes cleaning easier and more thorough.

[0032] To better represent the pulsating working state Figure 1 The two filter chambers in the middle show the filter bag state under the pulsating peak value and pulsating valley value states, respectively.

[0033] In one specific embodiment, the pulsating valve 43 is positioned close to the filter chamber 1. Thus, when the pulsating valve 43 is closed, the backflow fan 42 can operate continuously, storing sufficient pressure air within the second air duct 41. When the pulsating valve 43 opens and operates in a pulsating manner, a sufficient amount of pulsating air rushes into the filter chamber 1, causing the filter bag to deform instantly from a trough to a peak value, thus increasing the dust removal effect.

[0034] In one specific embodiment, multiple filter chambers 1 are connected in parallel, resulting in better dust removal and filtration. To achieve uniform air supply to each filter chamber 1, the following structural configuration is adopted: Specifically, as follows... Figure 5 As shown, the air intake system 2 includes an air intake main pipe 21. The diameter of the air intake main pipe 21 decreases step by step along the air intake direction. Each air intake main pipe 21 corresponding to each pipe diameter is connected to a filter chamber 1 through an air intake branch pipe 22 to achieve pressure equalization air intake.

[0035] In one specific embodiment, the lower part of the filter chamber 1 is a constricted section to facilitate dust discharge. The body of the filter cartridge 12 is placed in the lower space 14 above the constricted section. An air inlet connected to the air inlet system 2 is provided on the slope of the constricted section. A discharge port is provided at the bottom of the constricted section. A double-flip sealed unloader 15 connected to the dust conveying system 5 is provided at the discharge port. The double-flip sealed unloader 15 is an existing structure and will not be described in detail here.

[0036] In one specific embodiment, the experiment showed that magnesium chloride is easily present in general inorganic salt products such as potassium chloride, potassium sulfate, and sodium sulfate. During the dust removal process, magnesium chloride absorbs moisture and easily turns into dihydrate or hexahydrate magnesium chloride, which is easily enriched in the primary dust. This makes it difficult to remove secondary dust in one pulse cleaning cycle, and multiple pulse cleaning cycles are required. Generally, 3-5 pulse cleaning cycles, that is, after the air outlet valve 33 and the pulse valve 43 are alternately opened and closed 3-5 times, the dust on the filter bag can be cleaned well.

[0037] In one specific embodiment, the filter chamber 1 corresponding to the lower space 14 is also provided with an inspection manhole 16; the top of the filter chamber corresponding to the upper space is provided with a maintenance door 17.

[0038] In one specific embodiment, the dust conveying system 5 includes a discharge pipe 51 connected to the filter chamber 1, and the discharge pipe 51 is connected to a conveying device 52, which can be an existing scraper conveyor, bolt conveyor, etc.

[0039] In one specific embodiment, the back-blowing air volume of the filter chamber 1 is 1.1-4 times the air volume of the filter chamber inlet, and the back-blowing air pressure of the filter chamber is 1.5-3.5 times the air pressure of the filter chamber inlet. The back-blowing air pressure used is approximately 1300-5500 Pa, which will not damage the filter cloth.

[0040] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0041] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A pulsating bag filter, characterized in that, It includes a filter chamber and its connected air intake system, air outlet system, dust removal system and dust conveying system; The filter chamber is divided into an upper space and a lower space by a perforated plate. The air outlet system and dust removal system are connected to the upper space, and the air inlet system and dust conveying system are connected to the lower space. Multiple filter cartridges with cylindrical bodies placed in the lower space are connected to the perforated plate. The outer side of the filter cartridge is the filtration working surface. The internal space of the filter cartridge is connected to the upper space through its upper opening. The filter cartridge includes a frame and a filter bag covering the frame. The filter bag is made of glass fiber woven fabric. The frame is composed of 6-10 vertical ribs and several ring ribs. The multiple vertical ribs are evenly distributed along the circumference of the frame. The air outlet system includes a first air duct connected to the filter chamber, the first air duct being connected to the main exhaust fan, and an air outlet valve installed on the first air duct; the dust removal system includes a second air duct connected to the filter chamber, the second air duct being connected to the back blower, and a pulsating valve installed on the second air duct. The pulsating valve pulsates multiple times and alternately opens and closes with the air outlet valve to achieve pulsating dust removal of the filter bags. When the distance between adjacent vertical ribs is d, the pulsating stroke of the filter bag dust removal is L = (0.15-0.4)d.

2. The pulsating bag filter according to claim 1, characterized in that, Multiple filter chambers are connected in parallel. The air intake system includes an air intake main pipe. The diameter of the air intake main pipe decreases step by step along the air intake direction. Each air intake main pipe corresponding to each diameter level is connected to a filter chamber through an air intake branch pipe to achieve pressure equalization of air intake.

3. The pulsating bag filter according to claim 1, characterized in that, The lower part of the filter chamber is a constriction section, and the body of the filter cartridge is placed in the lower space above the constriction section. An air inlet connected to the air inlet system is provided on the slope of the constriction section, and a discharge port is provided at the bottom of the constriction section. A double-flip sealed unloader connected to the dust conveying system is provided at the discharge port.

4. The pulsating bag filter according to claim 1, characterized in that, The air outlet valve and the pulse valve alternately open and close 3-5 times.

5. The pulsating bag filter according to claim 1, characterized in that, The filter chamber corresponding to the lower space is also provided with an inspection manhole; the filter chamber corresponding to the upper space is provided with a maintenance door at the top.

6. The pulsating bag filter according to claim 1, characterized in that, The dust conveying system includes a discharge pipe connected to the filter chamber, and the discharge pipe is connected to a conveying device.

7. The pulsating bag filter according to claim 1, characterized in that, The backflush air volume of the filter chamber is 1.1-4 times the air intake air volume of the filter chamber, and the backflush air pressure of the filter chamber is 1.5-3.5 times the air intake air pressure of the filter chamber.

8. The pulsating bag filter according to claim 1, characterized in that, The pulsating valve is located near the filter chamber.

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