A dust removal device for boiler tail gas

Abstract

The present invention relates to the technical field of boiler exhaust gas treatment equipment, and specifically discloses a dust removal device for boiler tail gas, including a box body with a hollow interior. An exhaust pipe is fixedly installed at the top of the box body, and an intake pipe is fixedly installed on the side wall of the box body. A partition plate and a baffle are successively and fixedly arranged on the inner wall of the box body from top to bottom. A rotatable filter chamber is installed between the partition plate and the baffle. The filter chamber is composed of three fan-shaped filter bins, and three holes corresponding to the filter bins are formed on the partition plate. In the present invention, the air flow in a single filter bin is made to flow reversely through the backwashing assembly, so that this filter bin can be cleaned while the other two filter bins are performing the filtering work, and in cooperation with the switching assembly, each filter bin is periodically and separately cleaned by the backwashing air flow. Without affecting the filtering efficiency during operation, the filter bags in each filter bin are cleaned, and there is always one filter bin being cleaned by the backwashing air flow while the other two filter bins continue the filtering work.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler exhaust gas treatment equipment, and specifically to a dust removal device for boiler tail gas. Background Art

[0002] A bag filter is a dry high-efficiency dust removal device widely used in industrial production to remove dust and other particulate matters. Its working principle is that when the dust-containing gas passes through the bag filter, the dust particles are intercepted by the fibers of the filter bag, and the clean gas is discharged through the filter bag. As the dust accumulates on the surface of the filter bag, the resistance of the filter bag will gradually increase. Therefore, in order to maintain the dust removal efficiency and avoid filter bag blockage, it is necessary to clean the ash regularly.

[0003] For example, Chinese Patent No. CN117839334B discloses a uniform filtration type bag filter, which includes two dust removal boxes arranged symmetrically left and right. A hopper is provided at the lower end of the dust removal box, and a horizontal partition is provided at the upper end of the dust removal box. Filter element assembly cylinders are rotatably arranged in a rectangular array on the horizontal partition. A cage-type bag filter element is fixedly arranged in the filter element assembly cylinder, and a driving mechanism for driving all the filter element assembly cylinders to rotate is arranged in the dust removal box; an air outlet channel is provided at the upper end of each dust removal box, and an air inlet pipe is provided below between the two dust removal boxes. The upper end of the air inlet pipe is connected with a shunt device extending between the lower ends of the two dust removal boxes. This invention changes the traditional fixed installation method of the bag filter, so that all the cage-type bag filter elements can rotate slowly during the operation of the filter, avoiding most of the dust airflow acting on the same side of the dust removal bag facing the airflow inlet, enabling the cage-type bag filter element to uniformly filter the dust gas, and effectively solving the problem that the cage-type bag filter element is more likely to be damaged due to the concentrated scouring of the dust airflow on one area of the bag, and improving the service life of the entire filter.

[0004] However, when cleaning the filter in the above manner, offline cleaning is usually adopted. Offline cleaning requires closing the filtration chamber and cleaning each dust removal bag one by one. Therefore, the entire filter unit needs to be shut down for a long time, affecting the dust removal operation. Summary of the Invention

[0005] The purpose of the present invention is to provide a dust removal device for boiler tail gas to solve at least one of the technical problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: A dust removal device for boiler tail gas, including a box body with a hollow interior. An exhaust pipe is fixedly installed at the top of the box body, and an intake pipe is fixedly installed on the side wall of the box body. A partition and a baffle are fixedly installed on the inner wall of the box body from top to bottom in sequence. A rotatable filter chamber is installed between the partition and the baffle. The filter chamber is composed of three sector-shaped filter bins. Three holes corresponding to the filter bins are opened on the partition. An installation ring is fixedly installed in the through hole opened on the top surface of the filter bin. A cloth bag is fixedly installed in the installation ring. A round hole is opened at the bottom surface of each filter bin, and three through holes corresponding to the round holes at the bottom surface of the filter bins are opened on the bottom surface of the baffle.

[0007] It further includes a backwashing component, which is used to make the air flow reverse in a single filter bin;

[0008] It further includes a switching component, which is used to switch the filter bin affected by the backwashing component.

[0009] Preferably, the backwashing component includes a one-way intake valve fixedly installed in one of the holes on the partition. An air chamber is provided above the partition. A gas blocking plate is fixedly installed in the through hole on the baffle corresponding to the one-way intake valve. A hole is opened on the baffle, and an exhaust pipe is fixed in the hole. The exhaust pipe is located at the center of the filter chamber and is rotatably connected to the three filter bins. Intake ports are opened on the outer wall of the exhaust pipe located in the three filter bins. Air outlet ports are opened on the outer wall of each filter bin. The intake port of the exhaust pipe is always communicated with the air outlet of the filter bin where the air flow reverses. The position of the air outlet of the exhaust pipe is communicated with the intake pipe.

[0010] Preferably, the switching component includes a rotating rod fixedly connected to the center positions of the three filter bins, and a motor for driving the rotating rod to rotate is installed on the top surface of the box body.

[0011] Preferably, a cage is fixedly installed on the bottom surface of the installation ring, and the cloth bag is sleeved around the cage. Through grooves are opened in the horizontal rings of the cage and the cloth bag at the same horizontal plane. Two semi-circular elastic ropes are commonly threaded through the two through grooves. The two elastic ropes are connected by a connecting rope, and the connecting rope coincides with the diameter line of the horizontal ring;

[0012] A traction member for pulling the middle part of the connecting rope downward is further provided below the cloth bag.

[0013] Preferably, the traction member includes a piston box fixed to the bottom of the bottommost ring of the cage. The bottom of the cloth bag is open, and the opening is fixed to the bottommost ring of the cage. A piston plate is slidably installed on the inner wall of the piston box. A magnetic attraction block is provided inside the piston plate, and an electromagnet is provided inside the air blocking plate. A fixed pulley is fixedly installed on the inner bottom surface of the piston box. The middle of the connecting rope is fixedly connected with a traction rope. The traction rope extends downward through the piston plate, bypasses the fixed pulley, and is fixedly connected to the bottom surface of the piston plate. A spring is fixed between the piston plate and the inner bottom surface of the piston box.

[0014] Preferably, a dust bin is provided below the baffle in the box body. The dust bin is in an inverted pyramid shape and is fixedly connected with a dust hopper at the bottom end.

[0015] Preferably, the outer wall of the cloth bag at the through groove is designed with elastic folds.

[0016] Preferably, a ventilation funnel is also fixedly installed on the bottom surface of the mounting ring.

[0017] Preferably, a solenoid valve capable of controlling the air flow rate is fixedly installed in the exhaust duct.

[0018] Preferably, an annular protrusion is provided on the inner wall at the connection position of the air inlet pipe and the air outlet of the exhaust pipe.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] First, the present invention makes the air flow in a single filter chamber flow reversely through the recoil assembly, so that this filter chamber can be cleaned when the other two filter chambers are performing the filtering work, and in cooperation with the switching assembly, each filter chamber is periodically and separately cleaned by the recoil air flow. Without stopping the machine and affecting the filtering efficiency, the cloth bags in each filter chamber are cleaned, and always one filter chamber is cleaned by the recoil air flow while the other two filter chambers continue the filtering work, avoiding excessive accumulation of dust on a certain cloth bag due to long-term non-cleaning, resulting in an overly large dust cake and increasing the cleaning difficulty of the cloth bag. Moreover, the recoil air flow is composed of filtered gas, which can also prevent the inside of the cloth bag from being polluted by dust.

[0021] Second, the present invention rotates to switch the positions of the filter chambers, so that the filter chambers alternately correspond to the one-way air inlet valve in the partition and the air blocking plate in the baffle in turn, making the air flow in the filter chamber located between the one-way air inlet valve and the air blocking plate flow reversely, washing the dust adhering to the outer wall of the cloth bag in this filter chamber, and blowing off the dust on the outer wall of the cloth bag, avoiding excessive accumulation of dust on the outer wall of the cloth bag, which may block the cloth bag and reduce the filtering efficiency of the cloth bag for the flue gas.

[0022] III. Through the up-and-down movement of the piston plate and in coordination with the airflow change, the present invention can complete the tightening or expansion of the cloth bag. When the cloth bag is washed by the backflush airflow, the tightened and expanded cloth bag enables the airflow inside the cloth bag to quickly rush out of the outer wall of the cloth bag and escape in all directions, further enhancing the scouring effect on the cloth bag. Moreover, the vibration generated when the airflow impacts the cloth bag causes the soot adhering to the outer wall of the cloth bag to be vibrated, reducing the adhesion degree to the outer wall of the cloth bag, so as to achieve the purpose of making it more conducive for the soot to break away under the backflush airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0024] Figure 2 is a sectional view of the three-dimensional structure of the present invention;

[0025] Figure 3 is a front sectional view of the present invention;

[0026] Figure 4 is a side sectional view of the present invention;

[0027] Figure 5 is a three-dimensional structural schematic diagram of the filter chamber of the present invention;

[0028] Figure 6 is a sectional view of the three-dimensional structure of the filter chamber of the present invention;

[0029] Figure 7 is a top sectional view of the filter chamber of the present invention;

[0030] Figure 8 of the present invention Figure 7 is an enlarged view of part A;

[0031] Figure 9 is a sectional view of the air chamber of the present invention;

[0032] Figure 10 is a schematic diagram of the cloth bag backflush of the present invention;

[0033] Figure 11 is a schematic diagram of the cloth bag filtration of the present invention.

[0034] In the figure: 1. Box body; 2. Intake pipeline; 3. Exhaust pipeline; 4. Dust hopper; 5. Air chamber; 6. Partition board; 7. Baffle; 8. Rotating rod; 9. Exhaust pipe; 10. Dust bin; 11. Spring; 12. One-way intake valve; 13. Cloth bag; 14. Air blocking plate; 15. Piston box; 16. Filter chamber; 17. Fixed pulley; 18. Through slot; 19. Bag cage; 20. Elastic cord; 21. Piston plate; 22. Installation ring; 23. Motor; 24. Through hole; 25. Solenoid valve; 26. Connecting cord; 27. Traction cord; 28. Ventilation funnel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1 to 11 , the present invention provides a technical solution: a dust removal device for boiler tail gas, including a box body 1 with a hollow interior. An exhaust pipe 3 is fixedly installed at the top of the box body 1, and an intake pipe 2 is fixedly installed on the side wall of the box body 1. A partition plate 6 and a baffle plate 7 are fixedly arranged on the inner wall of the box body 1 from top to bottom in sequence. A rotatable filter chamber is installed between the partition plate 6 and the baffle plate 7. The filter chamber is composed of three sector-shaped filter bins 16. Three holes corresponding to the filter bins 16 are opened on the partition plate 6. An installation ring 22 is fixedly installed in the through hole opened on the top surface of the filter bin 16, and a cloth bag 13 is fixedly installed in the installation ring 22. A round hole is opened at the bottom surface of each filter bin 16, and three through holes 24 corresponding to the round holes at the bottom surface of the filter bin 16 are opened on the bottom surface of the baffle plate 7.

[0037] It further includes a backwashing assembly for making the gas flow in a single filter bin 16 reverse.

[0038] It further includes a switching assembly for switching the filter bin 16 affected by the backwashing assembly.

[0039] When the device is in use, first, the flue gas is introduced into the intake pipe 2, so that the flue gas enters two filter bins 16 in the filter chamber. When the flue gas passes through the cloth bag 13, it will be blocked by the fibers on the outer surface of the cloth bag 13, so that the soot remains on the outer wall of the cloth bag 13. The gas filtered by the cloth bag 13 passes through the holes opened on the partition plate 6 and is discharged through the exhaust pipe 3 at the top of the box body 1. At this time, the remaining one filter bin 16 is affected by the backwashing assembly, and a part of the gas filtered by the other two filter bins 16 enters this filter bin 16, making the gas flow in it reverse, washing and separating the soot adhering to the outer wall of the cloth bag 13 in this filter bin 16 from the cloth bag 13, completing the cleaning of the cloth bag 13 in this filter bin 16. Then, the filter bin 16 is switched through the switching assembly, so that the next group of filter bins 16 is switched into the backwashing assembly, and the gas flow in this filter bin 16 is made to reverse through the backwashing assembly to clean the cloth bag 13 in this filter bin 16.

[0040] In this way, the air flow in a single filter chamber 16 is reversed by the backwashing assembly, enabling this filter chamber 16 to be cleaned while the other two filter chambers 16 are performing the filtering operation. In cooperation with the switching assembly, each filter chamber 16 is periodically and individually cleaned by the backwashing air flow. Without affecting the filtering efficiency during operation, the filter bags 13 in each filter chamber 16 are cleaned, and there is always one filter chamber 16 being cleaned by the backwashing air flow while the other two filter chambers 16 continue with the filtering operation, preventing excessive accumulation of soot on a certain filter bag 13 due to long-term lack of cleaning, which would result in an overly large dust cake and increase the difficulty of cleaning the filter bag 13. Moreover, the backwashing air flow is composed of filtered gas, which can also prevent the interior of the filter bag 13 from being contaminated by soot.

[0041] Furthermore, the backwashing assembly includes a one-way intake valve 12 fixedly installed in one of the holes on the partition plate 6. Above the partition plate 6 is provided an air chamber 5. A gas-blocking plate 14 is fixedly installed in the through hole 24 corresponding to the one-way intake valve 12 on the baffle plate 7. The baffle plate 7 is provided with a hole, and an exhaust pipe 9 is fixed in the hole. The exhaust pipe 9 is located at the center of the filtering chamber and is rotationally connected to the three filter chambers 16. Intake ports are provided on the outer wall of the exhaust pipe 9 located in the three filter chambers 16. An air outlet is provided on the outer wall of each filter chamber 16. The intake port of the exhaust pipe 9 is always connected to the air outlet of the filter chamber 16 where the air flow is flowing in the reverse direction. The position of the air outlet of the exhaust pipe 9 is connected to the intake pipe 2.

[0042] According to the above-described embodiment, a specific embodiment of the backwashing assembly is provided. When a certain filter chamber 16 is switched to the influence range of the backwashing assembly through the switching assembly, due to the blocking of the gas-blocking plate 14, the flue gas cannot enter the filter chamber 16 through the baffle plate 7. At this time, the gas filtered by the other two filter chambers 16 is discharged into the air chamber 5, increasing the air pressure inside the air chamber 5. At the same time, Figure 4 since the flue gas flows through the intake pipe 2, according to Bernoulli's principle, a pressure difference is generated in the exhaust pipe 9, and then a pressure difference is formed between the exhaust pipe 9 and the air chamber 5. In this way, in cooperation with the one-way intake valve 12, gas can enter the filter chamber 16 affected by the backwashing assembly from the air chamber 5, thereby generating a backwashing air flow. Specifically, Figure 10 the air flow passes through the filter bag 13 from the inside to the outside and enters the intake pipe 2 through the exhaust pipe 9, forming a reflux backwashing air flow. Under the action of the backwashing air flow, the soot adhering to the outer wall of the filter bag 13 falls off under the scouring of the air flow, preventing excessive accumulation of soot on the outer wall of the filter bag 13 and reducing the hindrance of the soot to the filtering efficiency of the filter bag 13 when filtering the flue gas.

[0043] Furthermore, the switching assembly includes a rotating rod 8 fixedly connected to the central position of the three filter chambers 16, and a motor 23 for driving the rotation of the rotating rod 8 is installed on the top surface of the box body 1.

[0044] According to the above embodiments, a specific embodiment of a switching component is provided. Refer to Figures 3 - 4 , the rotating rod 8 can be driven by the motor 23 to rotate 120 degrees together, so that the rotating rod 8 can drive the three filter chambers 16 to rotate 120 degrees together, enabling the three filter chambers 16 to sequentially correspond to the one-way intake valve 12 in the partition plate 6 and the air blocking plate 14 in the baffle plate 7, and thus the switching of the filter chambers 16 can be completed. Figures 3 - 4 Only the installation method of one rotating rod 8 and the motor 23 is shown, and the other rotating rods 8 are arranged in the same way.

[0045] In this way, by rotating to switch the position of the filter chamber 16, the filter chamber 16 is made to sequentially correspond to the one-way intake valve 12 in the partition plate 6 and the air blocking plate 14 in the baffle plate 7 in turn, so that the airflow in the filter chamber 16 between the one-way intake valve 12 and the air blocking plate 14 flows in the reverse direction, flushing the soot adhering to the outer wall of the filter bag 13 in this filter chamber 16 to complete the above-mentioned backwashing cleaning process.

[0046] Refer to Figures 2 - 4 , multiple groups of filter chambers can be provided.

[0047] Furthermore, a cage 19 is fixedly installed on the bottom surface of the mounting ring 22, and the filter bag 13 is sleeved on the periphery of the cage 19. Through grooves 18 are provided in both the horizontal rings of the cage 19 and the filter bag 13 at the same horizontal plane as the horizontal rings. Two semi-circular elastic ropes 20 are commonly threaded through the two through grooves 18, and the two elastic ropes 20 are connected by a connecting rope 26, and the connecting rope 26 coincides with the diameter line of the horizontal ring.

[0048] A traction member for pulling the middle part of the connecting rope 26 downward is further provided below the filter bag 13.

[0049] According to the above embodiments, when the filter bag 13 is affected by the backwashing airflow, it will expand outward. Specifically, refer to Figure 10 , at this time, the airflow flows from inside the filter bag 13 to the outside. The expansion of the filter bag 13 drives the elastic rope 20 to stretch, and pulls the connecting rope 26 and the traction member upward together. When the filter bag 13 expands to the maximum, at this time, due to the stretching of the fiber grid of the filter bag 13, a relative displacement is generated between the filter bag 13 and the soot adhering to the outer wall of the filter bag 13, tearing the dust cake generated by the accumulation of a large amount of soot and reducing the adhesion of small soot blocks to the outer wall of the filter bag 13. Subsequently, the connecting rope 26 is quickly pulled by the traction member, so that the elastic rope 20 quickly contracts under the action of the connecting rope 26, driving the expanded filter bag 13 to contract together to the Figure 11 state shown to complete the tightening of the filter bag 13.

[0050] In this way, by pulling the elastic cord 20 to contract through the traction member, the rapid tightening of the cloth bag 13 can be completed. On the basis of the scouring of the reverse impact air flow, the cloth bag 13 can also utilize the air cannon generated inside the cloth bag 13 to impact the inner wall of the cloth bag 13, and cooperate with the vibration generated by the impact to loosen the adhesion of the soot to the outer wall of the cloth bag 13, so that the reverse impact air flow can more easily blow the soot away when passing through the cloth bag 13.

[0051] Furthermore, the traction member includes a piston box 15 fixed to the bottom of the bottommost ring of the cage 19. The bottom of the cloth bag 13 is provided with an opening, and the opening is fixed to the ring at the bottommost part of the cage 19. A piston plate 21 is slidably installed on the inner wall of the piston box 15. A magnetic attraction block is provided inside the piston plate 21, and an electromagnet is provided inside the air blocking plate 14. A fixed pulley 17 is fixedly installed on the inner bottom surface of the piston box 15. The middle of the connecting rope 26 is fixedly connected with a traction rope 27. The traction rope 27 extends downward through the piston plate 21 and bypasses the fixed pulley 17 and then is fixedly connected to the bottom surface of the piston plate 21. A spring 11 is fixed between the piston plate 21 and the inner bottom surface of the piston box 15.

[0052] According to the above embodiment, a specific embodiment of the traction member is provided. When the filter chamber 16 switches to the next group, the air flow enters the filter chamber 16 through the one-way intake valve 12 to expand the cloth bag 13. For details, see Figure 10 , the expansion of the cloth bag 13 pulls the connecting rope 26 and the traction rope 27 to rise. At the same time, the electromagnet is energized to adsorb the magnetic attraction block inside the piston plate 21, thereby driving the piston plate 21 to descend. When the piston plate 21 descends, the space inside the cloth bag 13 increases, enabling it to accommodate more gas. After that, the electromagnet is powered off to release the adsorption effect on the magnetic attraction block. At this time, the piston plate 21 quickly moves upward under the action of the instant release of the elastic force of the spring 11. For details, see Figure 6 , the rising of the piston plate 21 pulls the traction rope 27 to descend, and drives the elastic cord 20 and the connecting rope 26 to descend together, and cooperates with the pulling force of the spring 11 to instantaneously tighten the cloth bag 13 under the pulling force of the elastic cord 20 to Figure 11 as shown in, so that the air flow inside the cloth bag 13 quickly passes through the cloth bag 13 and escapes to the outside of the cloth bag 13, and uses the rapidly flowing air flow to impact the cloth bag 13, so that the vibration generated by the impact shakes off the soot on the outer wall of the cloth bag 13.

[0053] In this way, through the up and down movement of the piston plate 21 and in cooperation with the air flow change, the tightening or expansion of the cloth bag 13 can be completed. When the cloth bag 13 is scoured by the reverse impact air flow, by tightening and expanding the cloth bag 13, the air flow inside the cloth bag 13 quickly rushes out of the outer wall of the cloth bag 13 and escapes to the surroundings, further enhancing the scouring effect on the cloth bag 13. Moreover, the vibration generated when the air flow impacts the cloth bag 13 reduces the adhesion degree of the soot adhering to the outer wall of the cloth bag 13, so as to achieve the purpose of making it more conducive for the soot to break away under the reverse impact air flow.

[0054] Moreover, it is worth noting that from the above, it can be seen that the recoil process of the cloth bag 13 mainly utilizes the air cannon generated inside the cloth bag 13 to impact the inner wall of the cloth bag 13. The instantaneous upward movement of the piston plate 21 can reduce the space inside the cloth bag 13, further increasing the force of the generated air cannon (i.e., the air pressure inside the cloth bag 13), thereby further improving the vibration impact effect on the cloth bag 13, and then improving the recoil cleaning effect. Moreover, the instantaneous increase in the internal pressure of the cloth bag 13 can cause the fiber filter holes on it to expand instantaneously further compared to the previous aperture, further enhancing the recoil effect on the soot.

[0055] Furthermore, a dust bin 10 is provided below the baffle 7 inside the box body 1. The dust bin 10 is in an inverted pyramid shape and is fixedly connected to a dust hopper 4 at the bottom end.

[0056] As Figure 3 described above, when the soot accumulated on the outer wall of the cloth bag 13 falls off under the action of the recoil air flow and the vibration of the cloth bag 13, it will drop from the filter bin 16 into the dust bin 10. Since the dust bin 10 is in an inverted pyramid shape, the fallen soot slowly gathers into the dust hopper 4, facilitating the subsequent collection and cleaning of the soot.

[0057] Furthermore, the outer wall of the cloth bag 13 at the through groove 18 is designed with elastic folds.

[0058] According to the above embodiments, when the piston plate 21 rises under the action of the electromagnet, the cloth bag 13 is quickly tightened under the action of the elastic cord 20. By providing elastic folds on the outer wall of the through groove 18 of the cloth bag 13, the expansion coefficient of the cloth bag 13 when it expands under the action of the recoil air flow is increased, and more air is accommodated inside the cloth bag 13. That is, when the cloth bag 13 is tightened, more and faster air flows through the cloth bag 13, making the soot adhering to the outer wall of the cloth bag 13 easier to fall off.

[0059] Furthermore, a ventilation funnel 28 is fixedly installed on the bottom surface of the mounting ring 22.

[0060] According to the above embodiments, by installing the ventilation funnel 28 on the bottom surface of the mounting ring 22, the gas entering the filter bin 16 from the air storage chamber 5 can be accelerated at one end in the ventilation funnel 28, increasing the air flow scouring effect on the cloth bag 13, thereby enhancing the cleaning effect on the cloth bag 13.

[0061] Furthermore, a solenoid valve 25 capable of controlling the air flow rate is fixedly installed in the exhaust pipe 3.

[0062] According to the above embodiments, a specific embodiment for controlling the air flow rate in the exhaust duct 3 is provided. The solenoid valve 25 in the exhaust duct 3 can be used to reduce the air flow rate in the exhaust duct 3, so that the gas filtered by the cloth bag 13 accumulates in the air chamber 5, increasing the air pressure in the air chamber 5. Under the action of the air pressure, the filtered gas breaks through the obstruction of the one-way intake valve 12 and quickly enters the filter chamber 16 to backflush the cloth bag 13, achieving a pulse-like effect to clean the soot accumulated on the outer wall of the cloth bag 13.

[0063] It is worth mentioning that due to the rapid entry of the gas, the cloth bag 13 will quickly expand to Figure 10 the state shown, stretching the fiber grid outside the cloth bag 13 and causing a relative displacement between the cloth bag 13 and the soot adhering to its outer wall. As a result, the adhesion of the soot to the cloth bag 13 decreases, making it easier for the soot to fall off under the backflush of the air flow. Combined with the tightening of the cloth bag 13 described above, the cleaning effect of the soot on the outer wall of the cloth bag 13 is further improved by two relative displacements between the cloth bag 13 and the soot adhering to its outer wall.

[0064] Furthermore, an annular protrusion is provided on the inner wall of the connection position between the intake duct 2 and the outlet of the exhaust pipe 9.

[0065] According to the above embodiments, since an annular protrusion is provided on the inner wall of the connection position between the intake duct 2 and the outlet of the exhaust pipe 9, when the external flue gas enters the intake duct 2, the gas flow rate in the intake duct 2 will increase, thereby reducing the air pressure in the intake duct 2. After the air pressure in the intake duct 2 decreases, a suction force will be generated in the exhaust pipe 9, making it easier for the gas in the filter chamber 16 to enter the intake duct 2 under the attraction of the exhaust pipe 9, completing the air flow cycle during the backflush process and preventing the internal components of the dust collector from being damaged due to excessive internal air pressure.

[0066] The standard parts used in this embodiment can be directly purchased from the market. For the non-standard structural components described in the specification and drawings, they can also be directly processed according to the existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt the mature conventional means in the existing technology, and the machines, parts and equipment all adopt the conventional models in the existing technology. Therefore, no specific description will be made here.

[0067] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dust removal device for boiler tail gas, comprising a hollow box, characterized in that: An exhaust pipe is fixedly installed on the top of the box, an air intake pipe is fixedly installed on the side wall of the box, a partition and a baffle are fixed on the inner wall of the box from top to bottom, a rotatable filter chamber is installed between the partition and the baffle, the filter chamber is composed of three fan-shaped filter bins, three holes corresponding to the filter bins are opened on the partition, a mounting ring is fixedly installed in the perforation opened on the top surface of the filter bin, a cloth bag is fixedly installed in the mounting ring, a circular hole is opened on the bottom surface of each filter bin, and three through holes corresponding to the circular holes on the bottom surface of the filter bin are opened on the bottom surface of the baffle; Also included is a backflushing assembly, which is used to reverse the airflow in a single filter bin; Also included is a switching component, the switching component is used to switch the filter bin affected by the backflushing component; The recoil assembly includes a one-way air inlet valve fixedly installed in one of the holes on the partition, an air bin is provided above the partition, an air blocking plate is fixedly installed in the through hole on the baffle corresponding to the one-way air inlet valve, a hole is provided on the baffle, and an exhaust pipe is fixed in the hole, the exhaust pipe is located in the center of the filter chamber and is rotatably connected to the three filter bins, an air inlet is provided on the outer wall of the exhaust pipe located in the three filter bins, an air outlet is provided on the outer wall of each filter bin, the air inlet of the exhaust pipe is always connected to the air outlet of the filter bin where the airflow flows in the opposite direction, and the air outlet position of the exhaust pipe is connected to the air inlet pipe; An annular protrusion is provided on the inner wall of the connection between the air inlet duct and the air outlet of the exhaust pipe; The switching assembly comprises a rotating rod fixedly connected to the center positions of the three filter bins, and a motor for driving the rotating rod to rotate is installed on the top surface of the box body.

2. The dust removal device for boiler tail gas according to claim 1, characterized in that: A bag cage is fixedly installed on the bottom surface of the mounting ring, and the cloth bag is sleeved on the outer periphery of the bag cage. The transverse ring of the bag cage and the cloth bag on the same horizontal plane as the transverse ring are both provided with through grooves, and two semi-circular elastic ropes are passed through the two through grooves. The two elastic ropes are connected by a connecting rope, and the connecting rope coincides with the diameter line of the transverse ring. A traction member for pulling the middle part of the connecting rope downward is also provided under the cloth bag.

3. The dust removal device for boiler tail gas according to claim 2, characterized in that: The traction device includes a piston box fixed to the bottom of the lowest circular ring of the bag cage. The bottom of the cloth bag is open, and the opening is fixed to the circular ring at the bottom of the lowest bottom of the bag cage. A piston plate is slidably installed on the inner wall of the piston box, a magnetic block is provided in the piston plate, and an electromagnet is provided inside the air blocking plate. A fixed pulley is fixedly installed on the inner bottom surface of the piston box, a traction rope is fixedly connected to the middle part of the connecting rope, the traction rope extends downward, passes through the piston plate, bypasses the fixed pulley, and is fixedly connected to the bottom surface of the piston plate. A spring is fixed between the piston plate and the inner bottom surface of the piston box.

4. The dust removal device for boiler tail gas according to claim 3 is characterized in that: A dust bin is provided below the baffle in the box body. The dust bin is arranged in an inverted pyramid shape and a dust hopper is fixedly connected to the bottom end.

5. The dust removal device for boiler tail gas according to claim 4, characterized in that: The outer wall of the cloth bag at the through groove is designed with elastic pleats.

6. The dust removal device for boiler tail gas according to claim 5, characterized in that: A ventilation funnel is also fixedly mounted on the bottom surface of the mounting ring.

7. The dust removal device for boiler tail gas according to any one of claims 1 to 6, characterized in that: A solenoid valve capable of controlling the flow rate of airflow is fixedly installed in the exhaust duct.

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