Tail gas purification treatment equipment for smelting furnace

Abstract

The invention relates to a smelting furnace tail gas purification treatment device. A filter bag framework of the smelting furnace tail gas purification treatment device comprises a plurality of positioning rings and positioning columns fixedly connected between every two adjacent positioning rings. The bag-type dust collector further comprises a rotating shaft which is rotationally mounted on the top plate; the multiple shifting frames are arranged in an array mode in the axial direction and the circumferential direction of the rotating shaft and rotate along with the rotating shaft; the multiple dust cleaning rings are fixedly connected at intervals in the axial direction of the rotating shaft and arranged outside the filter bag body in a sleeving mode, and the filter bag body at least has radial elasticity; the multiple elastic ribs are connected between every two adjacent ash removal rings, and in the initial state, the elastic ribs are in a tightened state and attached to the outer wall of the filter bag body; when the shifting frame rotates along with the rotating shaft, the shifting frame pushes the elastic ribs to deform outwards through the inner wall of the filter bag body, and the elastic ribs bounce to the outer wall of the filter bag body at the moment that the shifting frame is separated from the elastic ribs. The elastic ribs are poked and bounced through the rotating poking frame, so that the elastic ribs bounce and strike the filter bag body, and the ash removal effect can be improved with small damage.

Description

Technical Field

[0001] This application relates to the technical field of industrial exhaust gas treatment, and in particular to a smelting furnace exhaust gas purification and treatment device. Background Technology

[0002] The smelting industry is an important pillar industry of my country's national economy, but the exhaust gas produced during its production process contains a large amount of dust and sulfur oxides (SO₄). x ), nitrogen oxides (NO) x Heavy metals (such as lead, mercury, and arsenic) and toxic and harmful substances such as dioxins pose a serious threat to the environment and human health. With the continuous improvement of environmental protection standards, the technology for purifying and treating smelting furnace exhaust gas has also undergone a development process from controlling single pollutants to controlling multiple pollutants in a coordinated manner.

[0003] Currently, smelting furnace tail gas purification systems typically employ multi-stage series processes, mainly including: primary dust removal (cyclone dust collector or electrostatic precipitator), desulfurization unit (wet / dry / semi-dry method), secondary dust removal (bag filter), denitrification unit (SCR / SNCR), and deep purification units such as activated carbon adsorption. A typical workflow is as follows: high-temperature tail gas first passes through a waste heat boiler to recover heat energy and cool down, then enters the dust removal equipment to remove large particulate dust, and then enters the desulfurization tower to remove SO₂. x After further deep dust removal by a bag filter, it then enters the denitrification reactor to remove NO. x Finally, heavy metals and trace pollutants such as dioxins are removed by activated carbon adsorption tower, and then discharged after meeting the standards.

[0004] However, for blast furnaces, the exhaust gas volume is large, and the bag filters required are also large. The pulse back-flushing system in conventional bag filters is insufficient to effectively clean the dust attached to the lower half of the filter bag body. The cleaning system, which is supplemented by mechanical beating or vibration, generally acts directly and rigidly on the filter bag body, causing dense relative movement between the lower part of the filter bag body and the filter bag frame. This leads to premature wear of the filter bag body and affects the filtration quality of the bag filter for exhaust gas dust. Summary of the Invention

[0005] In order to improve the problem that the mechanical beating or vibration-assisted dust removal method of the existing bag dust collector directly and rigidly acts on the filter bag body, which easily leads to premature wear of the filter bag body, this application provides a smelting furnace tail gas purification and treatment device.

[0006] The technical solution for the smelting furnace tail gas purification and treatment equipment provided in this application is as follows: A smelting furnace tail gas purification and treatment device includes a primary dust collector, a desulfurization tower, a bag filter, a denitrification reactor, and an activated carbon adsorption tower connected in sequence to the tail gas pipeline. The bag filter includes a housing, a top plate, a pulse backflushing system, multiple filter bag bodies, and multiple filter bag frames. The filter bag frame includes multiple positioning rings and positioning posts fixed between adjacent positioning rings. The bag filter also includes: A rotating shaft is rotatably mounted on the top plate and coaxial with the filter bag frame. The top plate is provided with a drive mechanism for driving the rotating shaft to rotate. The levers are arranged in an array along the axial and circumferential directions of the rotating shaft and rotate in sync with the rotating shaft. The multiple levers along the circumferential direction of the rotating shaft form a working group. Multiple cleaning rings are fixedly connected at intervals along the axial direction of the rotating shaft and sleeved on the filter bag body, and the filter bag body has at least radial elasticity; Elastic ribs are provided in multiple ways and connected between two adjacent cleaning rings. In the initial state, the elastic ribs are taut and fit against the outer wall of the filter bag body. As the lever rotates with the shaft, it pushes the elastic ribs outward through the inner wall of the filter bag body, and at the moment the lever detaches from the elastic ribs, the elastic ribs strike the outer wall of the filter bag body.

[0007] Furthermore, the rotating shaft is provided with multiple support arms in the circumferential direction, the lever is slidably disposed at the free end of the support arm, and a tension spring is connected between the lever and the support arm and a magnetic repulsion component is provided. The filter bag frame or the top plate is provided with a first positioning sensor for monitoring the rotation angle of the rotating shaft. The first positioning sensor and the magnetic repulsion component are electrically connected to a push-touch controller, which is configured to: When the first positioning sensor detects that the lever is about to correspond to the elastic rib, the magnetic repulsion component is controlled to generate a magnetic repulsion force so that the lever slides out and pushes the filter bag body past the outer contour of the corresponding elastic rib. Furthermore, when the first positioning sensor detects that the lever is about to pass the position of the corresponding elastic rib, the magnetic repulsion component is de-energized, and the lever quickly retracts under the action of the tension spring.

[0008] Furthermore, the trigger controller is also configured to: When the first positioning sensor detects that the lever has rotated to the area corresponding to the positioning post, it checks whether the magnetic repulsion component is de-energized; if not, it controls the magnetic repulsion component to be de-energized, and the lever retracts under the action of the tension spring.

[0009] Furthermore, the magnetic repulsion component includes: An electromagnet is fixedly installed on the support arm and electrically connected to the trigger controller. A permanent magnet is fixedly installed on the lever and opposite to the electromagnet. The permanent magnet and the electromagnet repel each other magnetically when energized.

[0010] Furthermore, the levers in two adjacent working groups along the axis of rotation are staggered.

[0011] Furthermore, when the rotating shaft rotates for one plucking cycle, at least one of the plucking frames in each of the multiple working groups simultaneously plucking the corresponding elastic ribs or sequentially plucking the corresponding elastic ribs from top to bottom within a short period of time.

[0012] Furthermore, the multiple elastic ribs distributed axially along the filter bag body and plucked in the same plucking rhythm are arranged in a spiral line coaxial with the filter bag body, and the spiral line rotates from top to bottom in the opposite direction to the rotation direction of the rotating shaft.

[0013] Furthermore, the spacing between two adjacent elastic ribs on the same circumference decreases from the upper end to the lower end of the filter bag body.

[0014] Furthermore, the elastic ribs are arranged at an angle downwards so that when the lever pushes the elastic ribs, a downward component force is generated.

[0015] Furthermore, the topmost dust removal ring is rotatably mounted on the top plate, and the top plate is provided with a power mechanism for driving the dust removal ring to rotate intermittently at a set angle and a second positioning sensor for monitoring the rotation angle of the dust removal ring. The trigger controller is configured to determine whether the trigger is about to rotate to any of the elastic ribs based on the rotation angle of the cleaning ring and the rotation angle of the shaft detected by the second positioning sensor.

[0016] In summary, the beneficial technical effects of this application are as follows: 1. When the drive mechanism drives the rotating shaft to rotate, the paddles follow the rotation and paddle the elastic ribs. The elastic ribs strike the outer wall of the filter bag body, so that multiple paddles in the circumferential direction of the rotating shaft and multiple working groups arranged in the axial array trigger the elastic ribs at different heights and circumferential positions in sequence and cycle. This creates continuous, uniform and intense mechanical vibration and beating on the entire outer surface of the filter bag body, causing the dust layer attached to the outside of the filter bag body to break, peel off and fall into the ash hopper, which can greatly improve the dust removal effect of the filter bag body. 2. The "bounce" force generated by the instantaneous rebound of the elastic ribs is a high-intensity, short-duration shock wave that can more effectively break the adhesion between dust and filter bag fibers than traditional mechanical vibration or airflow backflushing; it also causes less damage to the filter bag body and reduces excessive friction between the filter bag body and the filter bag skeleton, thus extending the service life of the filter bag body. 3. When the lever is about to pass the top of the elastic rib, it is rapidly retracted under the restoring force of the tension spring, reducing the contact time between the lever and the elastic rib. This allows the elastic potential energy of the elastic rib to be released instantly without hindrance, avoiding the weakening of the dust removal effect due to the delayed retraction of the lever consuming the elastic potential energy of the elastic rib. It can also avoid unnecessary contact between the lever and the filter bag body during the rotation of the shaft, reducing the probability of wear on the filter bag body. 4. By using synchronous or sequential flicking modes, multiple elastic ribs flicked within the same beat are arranged along the axial direction of the filter bag body into a spiral line coaxial with the filter bag. Moreover, the spiral line rotates in the same direction from top to bottom as the shaft rotates. This causes multiple elastic ribs to form a shock wave that moves along the spiral line when the shaft rotates, which will induce a complex stress state on the surface of the filter bag body and in the internal fibers. This stress field contains radial, axial and circumferential stress components. This complex stress field is effective in crushing and peeling off firmly embedded dust clumps with different orientations in the fibers. 5. With the elastic ribs set at an angle downwards, when the lever moves the elastic ribs, the elastic ribs generate a radial component force that drives the filter bag body to vibrate radially, and an axial component force that is transmitted downwards along the filter bag body axis. This can form a "spiral downward wave" that travels downwards along a spiral path. This not only enhances the complexity and propagation range of the stress wave generated by the elastic ribs, but also makes the dust removal action form a continuous and directional "rubbing" effect on the filter bag surface. It is especially effective for peeling off sticky dust and deeply embedded fine particles. 6. The cleaning ring is driven to rotate by a power mechanism and its rotation angle is monitored by a second positioning sensor. This can achieve a comprehensive cleaning effect on the filter bag body and avoid local stress concentration and fatigue wear on the filter bag body. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a partial cross-sectional view of the filtering unit in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the cleaning ring and elastic ribs according to an embodiment of this application; Figure 4 This is a schematic diagram of the filter bag skeleton according to an embodiment of this application; Figure 5 This is a cross-sectional structural diagram of the filtering unit in an embodiment of this application; Figure 6 This is a schematic diagram of the working group in this application embodiment, where the shaft is offset upwards. Figure 7 This is a cross-sectional view of the structure of the cleaning ring rotatably mounted on the top plate according to an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 1. Baghouse dust collector; 11. Housing; 12. Top plate; 13. Filter bag body; 14. Filter bag cage; 141. Positioning ring; 142. Positioning column; 2. Rotating shaft; 21. Support arm; 22. Tension spring; 23. Permanent magnet; 24. Electromagnet; 3. Turntable; 41. Dust removal ring; 42. Elastic ribs; 51. First positioning sensor; 52. Second positioning sensor; 61. Drive gear; 62. Gear ring. Detailed Implementation

[0019] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] This application discloses a smelting furnace tail gas purification and treatment device. (Refer to...) Figures 1-7 It includes a primary dust collector, a desulfurization tower, a bag filter 1, a denitrification reactor, and an activated carbon adsorption tower, all connected in sequence to the exhaust gas pipeline. The bag filter 1 includes a housing 11, a top plate 12, a pulse-jet system, multiple filter bag bodies 13, and multiple filter bag frames 14. Each filter bag body 13 and each filter bag frame 14 constitutes a filtration unit. The above structures and their connection methods are all existing technologies, which can be fully implemented by those skilled in the art and require no further explanation.

[0021] Specifically, refer to Figure 4 The filter bag frame 14 includes multiple positioning rings 141 and positioning posts 142 fixed between two adjacent positioning rings 141. In this embodiment, three positioning posts 142 are fixed between two positioning rings 141, and the central angle between two adjacent positioning posts 142 is 120°.

[0022] Reference Figure 1 , Figure 2 and Figure 3 The bag filter 1 also includes: The rotating shaft 2 is rotatably mounted on the top plate 12 and coaxial with the filter bag frame 14. The top plate 12 is provided with a drive mechanism for driving the rotating shaft 2 to rotate. The drive mechanism can be a servo motor or a servo motor plus a transmission system to realize the single-drive rotation of a single rotating shaft 2 or the synchronous drive of multiple rotating shafts 2. Its specific structure is a conventional technical means in the field, which can be fully implemented by those skilled in the art, and will not be elaborated further.

[0023] The lever 3 is arranged in a multiple array along the axial and circumferential directions of the rotating shaft 2 and rotates in sync with the rotating shaft 2. The multiple levers 3 along the circumferential direction of the rotating shaft 2 form a working group, and the multiple working groups are arranged along the axial direction of the rotating shaft 2.

[0024] Multiple cleaning rings 41 are fixedly connected at intervals along the axial direction of the rotating shaft 2 and sleeved on the outside of the filter bag body 13. The filter bag body 13 has at least radial elasticity. The outer diameter of the outer contour of the lever 3 is larger than the outer diameter of the cleaning rings 41. Multiple cleaning rings 41 are connected by multiple straight rods.

[0025] Multiple elastic ribs 42 are provided and connected between two adjacent cleaning rings 41. The multiple elastic ribs 42 are distributed in a circumferential array with equal spacing around the axis of the cleaning rings 41 and avoid the area where the positioning post 142 is located. In the initial state, the elastic ribs 42 are in a taut state and fit against the outer wall of the filter bag body 13.

[0026] When the lever 3 rotates with the rotating shaft 2, the lever 3 pushes the elastic rib 42 outward through the inner wall of the filter bag body 13, and at the moment the lever 3 disengages from the elastic rib 42, the elastic rib 42 bounces against the outer wall of the filter bag body 13.

[0027] Therefore, when the drive mechanism drives the rotating shaft 2 to rotate, the multiple levers 3 mounted on the rotating shaft 2 rotate accordingly. Since the outer diameter of the lever 3 is larger than the outer diameter of the cleaning ring 41, when the lever 3 rotates to contact the elastic rib 42, it pushes the corresponding elastic rib 42 from the inside of the filter bag body 13, forcing the elastic rib 42 to overcome its own elasticity and undergo radial deformation outward. At the instant the lever 3 continues to rotate and disengages from the contact of the elastic rib 42, the constraint disappears; the previously stretched and deformed elastic rib 42 releases its stored elastic potential energy instantaneously under the action of its own elastic restoring force, generating a high-speed, radially inward impact, violently striking the outer wall of the filter bag body 13. Since the elastic rib 42 is connected between the upper and lower cleaning rings 41, the single-point impact will generate a high-frequency, attenuated fluctuation on the surface of the filter bag body 13 through the tension of the elastic rib 42 and the conduction of the cleaning ring 41. At the same time, multiple paddles 3 arranged around the circumference of the rotating shaft 2 and multiple working groups arranged in an axial array sequentially and cyclically trigger the elastic ribs 42 at different heights and circumferential positions, thereby forming continuous, uniform and intense mechanical vibration and beating on the entire outer surface of the filter bag body 13, causing the dust layer attached to the outside of the filter bag body 13 to break, peel off and fall into the ash hopper, which can greatly improve the dust removal effect of the filter bag body 13.

[0028] Furthermore, the "bounce" force generated by the instantaneous rebound of the elastic ribs 42 is a high-intensity, short-duration shock wave that more effectively breaks the adhesion between dust and filter bag fibers than traditional mechanical vibration or airflow backflushing, especially effective for fine, sticky, or highly humid dust. Moreover, the elastic ribs 42 cause less damage to the filter bag body 13 when they bounce, further reducing excessive friction between the filter bag body 13 and the filter bag frame 14, thus extending the service life of the filter bag body 13. In addition, the evenly distributed elastic ribs 42 can periodically and evenly clean every area of ​​the filter bag body 13 surface, avoiding cleaning dead zones that may exist with traditional methods. Furthermore, the bounce intensity of the elastic ribs 42 is related to their initial tension, so it can be adjusted to a certain extent according to the actual dust characteristics (such as stickiness). For example, the higher the dust humidity or stickiness, the tighter the tension of the elastic ribs 42, so that the elastic ribs 42 store more elastic potential energy when the lever 3 rotates, thereby improving the bounce cleaning effect.

[0029] Specifically, refer to Figure 2 and Figure 5 The rotating shaft 2 is provided with multiple support arms 21 in the circumferential direction. The lever 3 is slidably disposed on the free end of the support arm 21. A tension spring 22 is connected between the lever 3 and the support arm 21 and a magnetic repulsion component is provided. Specifically, the free end of the support arm 21 is provided with a slide groove along its length direction. The lever 3 has a slide rod slidably disposed in the slide groove. The tension spring 22 is fixedly connected between the slide rod and the bottom wall of the slide groove.

[0030] A first positioning sensor 51 for monitoring the rotation angle of the rotating shaft 2 is provided on the filter bag frame 14 or the top plate 12. The first positioning sensor 51 can be an angle sensor or a Hall sensor; in this embodiment, it is set to an angle sensor. The first positioning sensor 51 and the magnetic repulsion component are electrically connected to a push-to-release controller, which is configured as follows: When the first positioning sensor 51 detects that the lever 3 is about to rotate to the corresponding elastic rib 42, it controls the magnetic repulsion component to generate magnetic repulsion so that the lever 3 slides out and pushes the filter bag body 13 past the outer contour of the corresponding elastic rib 42. Furthermore, when the first positioning sensor 51 detects that the lever 3 is about to pass the position of the corresponding elastic rib 42, it controls the magnetic repulsion component to be de-energized, and the lever 3 is quickly retracted under the elastic force of the tension spring 22.

[0031] Furthermore, the trigger controller is also configured as follows: When the first positioning sensor 51 detects that the lever 3 has rotated to the area corresponding to the positioning post 142, it checks whether the magnetic repulsion component is de-energized; if not, it controls the magnetic repulsion component to be de-energized, and the lever 3 retracts under the elastic force of the tension spring 22.

[0032] The magnetic repulsion component includes: Electromagnet 24 is fixedly installed on support arm 21 and electrically connected to the trigger controller; The permanent magnet 23 is fixedly installed on the lever 3 and is opposite to the electromagnet 24. The permanent magnet 23 and the electromagnet 24 repel each other magnetically when energized.

[0033] Therefore, by setting the first positioning sensor 51, the detonator controller can accurately determine whether the detonator 3 is "about to contact the elastic rib 42", "about to pass the elastic rib 42", or "in the area of ​​the positioning post 142 of the filter bag frame 14". Then, based on the received position signal, the detonator controller issues a command to the magnetic repulsion component to realize the "sliding out" and "retraction" of the detonator 3, specifically: When the lever 3 is about to contact the elastic rib 42, the lever controller controls the electromagnet 24 to be energized, generating a magnetic force that repels the permanent magnet 23 on the lever 3, pushing the lever 3 to slide out along the groove, ensuring that it can effectively push against the inner wall of the filter bag body 13, so that the corresponding elastic rib 42 on the outside can fully deform and store energy; the tension spring 22 is stretched in this process and also stores some energy.

[0034] As the lever 3 is about to pass the apex of the elastic rib 42, the lever controller cuts off the power to the electromagnet 24, and the magnetic repulsion force of the magnetic repulsion component disappears instantly. The lever 3 is then rapidly retracted under the restoring force of the tension spring 22. This retraction action reduces the contact time between the lever 3 and the elastic rib 42, allowing the elastic potential energy of the elastic rib 42 to be released instantly without hindrance. This avoids the lever 3's delayed retraction consuming the elastic potential energy of the elastic rib 42, which would weaken the dust removal effect. Furthermore, it can also avoid unnecessary contact between the lever 3 and the filter bag body 13 during the rotation of the shaft 2, reducing the probability of wear on the filter bag body 13.

[0035] When the lever 3 rotates to the area of ​​the positioning post 142 of the filter bag frame 14, the controller will force a check and ensure that the magnetic repulsion component is de-energized, so that the lever 3 retracts to avoid mechanical interference and wear with the positioning post 142, thereby ensuring the stability of the operation of multiple levers 3 on the rotating shaft 2.

[0036] In addition, when the extension of the lever 3 is achieved through the magnetic repulsion component, on the one hand, the magnitude of the magnetic repulsion force in the magnetic repulsion component can be adjusted by adjusting the current. Therefore, the lever controller can dynamically adjust the force of each "lever" according to operating parameters such as dust concentration and flue gas humidity in the exhaust gas. For example, when the dust is highly viscous, the current is increased to enhance the lever force of the lever 3; under normal operating conditions, a smaller current is used to save energy and reduce wear. On the other hand, the actual stroke of the lever 3 is slightly affected by the resistance of the elastic rib 42 (i.e., the thickness of the dust layer). The thicker the dust layer, the greater the resistance, and the smaller the sliding of the lever 3, which can avoid excessive scraping of the inner wall of the filter bag body 13 and further control the damage to the filter bag body 13 during the dust removal process.

[0037] In addition, refer to Figure 2 and Figure 6 The levers 3 in two adjacent working groups along the axis of the rotating shaft 2 are staggered. Therefore, when the rotating shaft 2 rotates at a constant speed, the levers 3 at different heights will pass the same circumferential position on the outer wall of the filter bag body 13 at different times. This discretizes the triggering of the elastic ribs 42 connected between the upper and lower cleaning rings 41 in time and space by multiple levers 3. The cleaning action of the elastic ribs 42 is no longer a "synchronous strip impact" along the longitudinal direction of the filter bag body 13, but is transformed into a "cleaning wave" that occurs alternately and progressively along the axial and circumferential directions of the filter bag body 13. Specifically, when a working group's lever 3 triggers a certain elastic rib 42, the resulting vibration is transmitted to the surrounding area through the elastic network composed of the elastic rib 42 and the dust removal ring 41. At this time, the levers 3 of adjacent working groups (which are in different circumferential positions due to misalignment) have not yet triggered or are about to trigger the adjacent ribs. This temporal and spatial staggering allows the dust removal force to cover the entire filter bag body 13 surface more evenly and fully, and may produce beneficial vibration superposition or interference, which can more effectively destroy the dust layer.

[0038] To further improve the dust removal effect when the elastic ribs 42 strike the filter bag body 13.

[0039] In one feasible embodiment, when the rotating shaft 2 rotates for one plucking cycle, at least one plucking frame 3 in each of the multiple working groups simultaneously plucking the corresponding elastic rib 42 or sequentially plucking the corresponding elastic rib 42 from top to bottom within a short period of time.

[0040] When multiple levers 3 distributed along the axial direction actuate the elastic ribs 42 almost synchronously within the same pulse cycle, the elastic potential energy stored in these elastic ribs 42 is released almost simultaneously, generating a set of nearly synchronous impact forces distributed along the filter bag axial direction. These forces will superimpose and couple in the filter bag body 13 and the elastic support network composed of the cleaning ring 41 and the elastic ribs 42. The effect is far more than the simple addition of multiple isolated impacts; it may generate a "synergistic vibration wave" propagating along the axial direction of the filter bag body 13, which can more effectively overcome the cohesive force of the dust layer, especially for the highly adhesive fine dust commonly found in smelting exhaust gases. This is fundamentally different from the instantaneous overall impact of compressed air on the filter bag in traditional pulse cleaning, where the latter has a large effective area but decays quickly. The mechanical effect generated in this application is a mechanical effect that is precisely triggered at multiple points and propagates more strongly within the elastic structure. Especially in the sequential flicking mode, the spring ribs 42 are triggered sequentially from top to bottom in the axial direction with a very short time difference, forming a dust removal action "wave" that propagates along the filter bag axial direction, which can accelerate the falling of the attached dust into the lower ash hopper.

[0041] In another feasible embodiment, further, multiple elastic ribs 42 distributed axially along the filter bag body 13 and deflected in the same deflection rhythm are arranged in a spiral pattern coaxial with the filter bag body 13, with the spiral direction from top to bottom opposite to the rotation direction of the rotating shaft 2; for example, as Figure 6 As shown, the levers 3 in two adjacent working groups are staggered by 30° from top to bottom.

[0042] Therefore, whether in synchronous or sequential flicking mode, the multiple elastic ribs 42 flicked within the same beat are arranged along the axial direction of the filter bag body 13 in a spiral line coaxial with the filter bag. Moreover, the spiral line rotates in the opposite direction from top to bottom to the rotation direction of the rotating shaft 2. This allows the flicking frame 3 to naturally follow this spiral path, synchronously flicking or sequentially contacting and flicking each elastic rib 42 from top to bottom, forming a flicking wave moving along the spiral line. This will induce a complex stress state on the surface and in the internal fibers of the filter bag body 13, containing radial, axial and circumferential stress components. This complex stress field is highly effective in crushing and peeling off firmly embedded dust clumps with different orientations in the fibers. Especially in the sequential flicking mode, due to the continuous offset of the impact point, the elastic ribs 42 of the sequential flicking apply a continuous and slight circumferential torque to the filter bag body 13 as a whole, which will cause the filter bag fibers to produce a slight torsional deformation. Its effect on the dust layer is no longer a simple "shaking off", but an added "twisting" mechanical effect, making the dust removal and dust settling effect more significant.

[0043] Considering that in the actual operation of the bag filter 1, dust-laden gas usually enters from the bottom or side of the filter bag, due to gravity, coarser and heavier dust particles will first settle in the lower part of the filter bag, resulting in a thicker and denser dust layer in the lower part of the filter bag and greater cleaning resistance. Therefore, in other feasible embodiments, the spacing between two adjacent elastic ribs 42 on the same circumference decreases from the upper end to the lower end of the filter bag body 13, as not shown in the figure.

[0044] Therefore, the upper elastic ribs 42 of the filter bag body 13 are sparse, resulting in fewer cleaning action points and relatively gentle force; the lower elastic ribs 42 of the filter bag body 13 are dense, resulting in more cleaning action points and more concentrated force, which matches the axial gradient cleaning requirements of the filter bag body 13 in actual operation, reduces unnecessary excessive mechanical action, makes the overall stress of the filter bag body 13 more reasonable, and thus effectively extends the service life of the filter bag body 13.

[0045] Furthermore, regarding the way the elastic ribs 42 are fixed on the cleaning ring 41, the elastic ribs 42 can be arranged vertically or obliquely downward, so that when the lever 3 pushes the elastic ribs 42, a downward component force is generated, thereby obtaining different cleaning effects.

[0046] Specifically, when the elastic ribs 42 are set at an angle downwards, and the rotation direction of the rotating shaft 2 is opposite to the tilting direction of the elastic ribs 42, when the lever 3 flicks the elastic ribs 42, the elastic ribs 42 generate a radial component force that drives the filter bag body 13 to vibrate radially, and an axial component force that is transmitted downwards along the axial direction of the filter bag body 13. During dust collector operation, the shaken-off dust naturally settles downwards under gravity. In traditional radial cleaning methods, the shaken-off dust may re-scatter or remain at the bottom of the filter bag. However, the downward axial component force generated in this application is exactly in the same direction as the natural settling direction of the dust. This axial component force acts like a "booster," actively guiding and accelerating the downward movement of the shaken-off dust clumps into the ash hopper, thereby greatly reducing the possibility of secondary adsorption and significantly improving cleaning efficiency and emission compliance reliability.

[0047] Especially when multiple elastic ribs 42, distributed axially along the filter bag body 13 and detonated in the same detonation cycle, are arranged in a spiral coaxial with the filter bag body 13, and when the action of each detonation point superimposes a downward component force, this "torsional wave" is further upgraded into a "spiral downward wave" traveling downward along the spiral path. This not only enhances the complexity and propagation range of the stress wave generated by the elastic ribs 42, but more importantly, it creates a continuous, directional "rubbing" effect on the surface of the filter bag body 13 during the dust removal action, which is particularly effective for removing sticky dust and deeply embedded fine particles.

[0048] In addition, considering that the elastic ribs 42 should not be arranged too densely on the filter bag body 13, so as not to affect the flicking effect of the lever 3 on the elastic ribs 42 when it rotates, the flicking of the elastic ribs 42 on the outer wall of the filter bag body 13 will be limited to the set area, and the cleaning effect will be poor.

[0049] Therefore, further, in another feasible embodiment, reference is made to Figure 7 The cleaning ring 41 used to install the elastic ribs 42 is configured to be rotatably installed on the outer periphery of the filter bag body 13. Specifically, the cleaning ring 41 at the uppermost end is rotatably sealed on the top plate 12. The top plate 12 is provided with a power mechanism for driving the cleaning ring 41 to rotate intermittently at a set angle and a second positioning sensor 52 for monitoring the rotation angle of the cleaning ring 41. The trigger controller is configured to determine whether the trigger 3 is about to rotate to any corresponding elastic rib 42 based on the rotation angle of the cleaning ring 41 detected by the second positioning sensor 52 and the rotation angle of the rotating shaft 2.

[0050] Specifically, the power mechanism can be a stepper motor or a servo motor, with its output end connected to a drive gear 61 to drive the gear ring 62 fixed to the outer wall of the uppermost dust removal ring 41 to rotate. The second positioning sensor 52 can be an angle sensor for detecting the rotation angle of the drive gear 61, or it can be an encoder built into the servo motor or stepper motor, which can provide feedback on the actual rotation angle of the gear ring 62 or the dust removal ring 41. Both the gear ring 62 and the drive gear 61 are covered with dust covers.

[0051] In this way, by driving the cleaning ring 41 to rotate intermittently at a set angle, the relative position of the elastic ribs 42 and the outer wall of the filter bag body 13 can be changed. On the one hand, it can achieve a comprehensive cleaning effect on the filter bag body 13, and on the other hand, it can avoid local stress concentration and fatigue wear of the filter bag body 13.

[0052] In addition, to improve the dust removal effect when the elastic ribs 42 strike the filter bag body 13, a raised structure or a guide groove structure is arranged in an array on the side of the elastic ribs 42 near the filter bag body 13, or a hollow structure is opened through the elastic ribs 42 so that the dust adhering to the outer wall of the filter bag body 13 can be quickly removed at the moment of impact. In this embodiment, the hollow structure on the elastic ribs 42 is taken as an example.

[0053] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A smelting furnace tail gas purification and treatment device, comprising a primary dust collector, a desulfurization tower, a bag filter, a denitrification reactor, and an activated carbon adsorption tower connected in sequence to the tail gas pipeline, wherein the bag filter includes a housing, a top plate, a pulse backflushing system, and multiple filter bag bodies and multiple filter bag frames, characterized in that, The filter bag frame includes multiple positioning rings and positioning posts fixed between two adjacent positioning rings; the bag filter also includes: A rotating shaft is rotatably mounted on the top plate and coaxial with the filter bag frame. The top plate is provided with a drive mechanism for driving the rotating shaft to rotate. The levers are arranged in an array along the axial and circumferential directions of the rotating shaft and rotate in sync with the rotating shaft. The multiple levers along the circumferential direction of the rotating shaft form a working group. Multiple cleaning rings are fixedly connected at intervals along the axial direction of the rotating shaft and sleeved on the filter bag body, and the filter bag body has at least radial elasticity; Elastic ribs are provided in multiple ways and connected between two adjacent cleaning rings. In the initial state, the elastic ribs are taut and fit against the outer wall of the filter bag body. As the lever rotates with the shaft, it pushes the elastic ribs outward through the inner wall of the filter bag body, and at the moment the lever detaches from the elastic ribs, the elastic ribs strike the outer wall of the filter bag body.

2. The smelting furnace tail gas purification and treatment equipment according to claim 1, characterized in that, The rotating shaft is provided with multiple support arms in the circumferential direction. The lever is slidably disposed at the free end of the support arm. A tension spring is connected between the lever and the support arm, and a magnetic repulsion component is provided. The filter bag frame or the top plate is provided with a first positioning sensor for monitoring the rotation angle of the rotating shaft. The first positioning sensor and the magnetic repulsion component are electrically connected to a push-touch controller, which is configured to: When the first positioning sensor detects that the lever is about to correspond to the elastic rib, the magnetic repulsion component is controlled to generate a magnetic repulsion force so that the lever slides out and pushes the filter bag body past the outer contour of the corresponding elastic rib. Furthermore, when the first positioning sensor detects that the lever is about to pass the position of the corresponding elastic rib, the magnetic repulsion component is de-energized, and the lever quickly retracts under the action of the tension spring.

3. The smelting furnace tail gas purification and treatment equipment according to claim 2, characterized in that, The trigger controller is also configured to: When the first positioning sensor detects that the lever has rotated to the area corresponding to the positioning post, it checks whether the magnetic repulsion component is de-energized; if not, it controls the magnetic repulsion component to be de-energized, and the lever retracts under the action of the tension spring.

4. The smelting furnace tail gas purification and treatment equipment according to claim 2, characterized in that, The magnetic repulsion component includes: An electromagnet is fixedly installed on the support arm and electrically connected to the trigger controller. A permanent magnet is fixedly installed on the lever and opposite to the electromagnet. The permanent magnet and the electromagnet repel each other magnetically when energized.

5. A smelting furnace tail gas purification and treatment device according to any one of claims 1-4, characterized in that, The levers in two adjacent working groups along the axis of rotation are staggered.

6. The smelting furnace tail gas purification and treatment equipment according to claim 5, characterized in that, When the rotating shaft rotates for one plucking cycle, at least one of the plucking frames in each of the multiple working groups simultaneously plucking the corresponding elastic ribs or sequentially plucking the corresponding elastic ribs from top to bottom within a short period of time.

7. The smelting furnace tail gas purification and treatment equipment according to claim 6, characterized in that, The multiple elastic ribs, which are distributed axially along the filter bag body and are pulsated in the same pulsating rhythm, are arranged in a spiral line coaxial with the filter bag body. The spiral line rotates from top to bottom in the opposite direction to the rotation direction of the rotating shaft.

8. The smelting furnace tail gas purification and treatment equipment according to claim 5, characterized in that, The spacing between two adjacent elastic ribs on the same circumference decreases from the top to the bottom of the filter bag body.

9. The smelting furnace tail gas purification and treatment equipment according to claim 1, characterized in that, The elastic ribs are arranged at an angle downwards so that when the lever pushes the elastic ribs, a downward component force is generated.

10. The smelting furnace tail gas purification and treatment equipment according to claim 2, characterized in that, The cleaning ring at the top is rotatably mounted on the top plate. The top plate is provided with a power mechanism for driving the cleaning ring to rotate intermittently at a set angle and a second positioning sensor for monitoring the rotation angle of the cleaning ring. The trigger controller is configured to determine whether the trigger is about to rotate to any of the elastic ribs based on the rotation angle of the cleaning ring and the rotation angle of the shaft detected by the second positioning sensor.

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