A dust removal device for a blast furnace flue gas treatment system

Abstract

The present application relates to the technical field of flue gas treatment equipment, and provides a dust removal device for a blast furnace flue gas treatment system, which comprises a box body, a filter bag frame arranged in the box body, a driving mechanism and a rapping frame; the rapping frame is arranged in the box body, a sleeve corresponding to the filter bag frame is arranged in the rapping frame, and the sleeve is sleeved with the lower part of the filter bag frame; and first sliding rods are symmetrically arranged on the two sides of the rapping frame. The present application overcomes the shortcomings of the prior art, has a reasonable design, a compact structure, and a dust removal mode combining mechanical rapping and pulse blowing; periodic mechanical rapping can effectively destroy and peel off the dust layer with strong adhesion force on the surface of the filter bag, thus creating favorable conditions for subsequent blowing; and pulse blowing can provide strong instantaneous reverse airflow, which can penetrate into the inside of the filter bag and remove the fine dust loosened after rapping; the two modes work together, thus significantly improving the overall dust removal efficiency and completeness, and the present application is especially suitable for the dust working condition of the blast furnace flue gas with complex components and possible viscosity.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment equipment technology, and specifically to a dust removal device for a blast furnace flue gas treatment system. Background Technology

[0002] The flue gas generated during the operation of blast furnaces contains a large amount of dust, which must be removed by high-efficiency dust removal before it can be discharged. Bag filters are widely used in blast furnace flue gas treatment systems due to their high filtration accuracy and stable operation. The dust removal technology is the key to determining the performance of bag filters and the life of filter bags.

[0003] Traditional dust removal methods mainly employ pulse jet cleaning. Pulse jet cleaning utilizes compressed air injected instantaneously in the reverse direction into the filter bag, causing the filter bag to expand and shake rapidly, thus removing dust. This method offers high cleaning intensity and relatively low energy consumption. However, in practical applications, especially for long filter bags, the high-speed airflow entering from the top venturi tube easily forms an "air column" that rushes directly to the bottom of the bag, resulting in insufficient airflow disturbance in the upper area of ​​the filter bag and weak cleaning effect. In particular, for the potentially sticky components in blast furnace flue gas, simple pulse jet cleaning is insufficient to remove the "caking" layer. Therefore, we propose a dust removal device for blast furnace flue gas treatment systems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a dust removal device for a blast furnace flue gas treatment system. It overcomes the deficiencies of existing technologies, has a reasonable design and compact structure, and solves the problems of existing pulse jet cleaning methods that are difficult to remove the "caking" layer and have weak cleaning effect in the upper area of ​​the filter bag.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a dust removal device for a blast furnace flue gas treatment system, comprising a housing and a filter bag frame disposed therein, and further comprising a drive mechanism and a vibrating frame;

[0006] The vibrating frame is installed inside the box, and there are corresponding sleeves inside that fit into the lower part of the filter bag frame. The vibrating frame is provided with first sliding rods on both sides.

[0007] The two sides of the box are provided with sliding sleeves that slide in cooperation with the first sliding rod;

[0008] The drive mechanism includes a connecting plate located outside the housing, a second slide rod connected to the connecting plate, and a power unit that drives the connecting plate to move.

[0009] The end of the second slide rod away from the connecting plate extends into the corresponding sliding sleeve. The end of the second slide rod is connected to the end of the first slide rod by a spring. The first slide rod on the side of the vibrating frame away from the second slide rod is connected to the inner wall of the box by a spring.

[0010] The power unit is configured to drive the connecting plate to move toward the housing to compress the spring, and to drive the vibrating frame to reset when the spring resets.

[0011] Preferably, the power unit includes a drive component mounted on the outer wall of the housing and a cam disposed on the output shaft of the drive component, and the connecting plate is provided with a fence frame on the side facing the housing, and the cam is located inside the fence frame;

[0012] In the initial state, there is a gap between the cam and the inner wall of the fence frame and the connecting plate. When the cam rotates, its protrusion pushes the fence frame and the connecting plate to move closer to the box body.

[0013] Preferably, the sleeve is provided with an elastic buffer pad in the form of a ring, and a vibration gap is left between the sleeve and the outer wall of the corresponding filter bag frame.

[0014] Preferably, the housing is equipped with a jet cleaning system, which includes several neatly arranged jet pipes. Each jet pipe has a nozzle at its bottom corresponding to a filter bag frame. Each filter bag frame has a venturi tube at its top, and each venturi tube is located below a corresponding nozzle. The filter bag frame is equipped with a flow guiding mechanism inside to disturb the airflow entering the upper part of the filter bag frame.

[0015] Preferably, the flow guiding mechanism includes a positioning rod vertically disposed at the center of the filter bag frame, and the outer wall of the positioning rod is provided with a plurality of flow guiding heads spaced apart along its length. The top of the flow guiding head has a conical structure, which is used to disturb the airflow entering the upper part of the filter bag frame.

[0016] Preferably, the bottom of the guide head has a conical structure to reduce airflow resistance.

[0017] Preferably, a plurality of flow guide grooves are provided on the outer peripheral wall of the flow guide head along the circumferential direction. The flow guide grooves are arc-shaped and penetrate the surfaces of the upper and lower conical structures of the flow guide head for airflow to pass through.

[0018] Preferably, the top of the positioning rod is detachably connected to the blowpipe via a connector.

[0019] Preferably, the connector includes a connecting frame connected to the top of the positioning rod, and a pair of clamping plates are symmetrically provided on the top of the connecting frame. The clamping plates are U-shaped structures adapted to the outer wall of the blow pipe.

[0020] Each of the card plates has slots at both ends, one of the slots is rotatably connected to a positioning plate, the bottom of the positioning plate is provided with a positioning post, and the other slot is provided with a positioning groove that matches the positioning post on one side.

[0021] By rotating the positioning plate, the positioning pin is screwed into the positioning groove, which causes the two ends of the clamping plate to move closer to the center, thereby gripping the blow pipe.

[0022] Preferably, the lower part of the positioning rod is a lead screw, the center of the guide head has a through hole and is sleeved on the outer wall of the positioning rod, and the lower outer wall of the positioning rod is threaded with nuts in pairs. The paired nuts are respectively located on the upper and lower sides of the guide head to fix the guide head at a set height.

[0023] This invention provides a dust removal device for a blast furnace flue gas treatment system. It has the following beneficial effects:

[0024] 1. By combining mechanical vibration with pulse jet cleaning, periodic mechanical vibration can effectively break down and peel off the strongly adhered dust layer on the surface of the filter bag, creating favorable conditions for subsequent pulse jet cleaning; while pulse jet cleaning can provide a powerful instantaneous reverse airflow that penetrates deep into the filter bag to remove the fine dust loosened after vibration. The synergistic effect of the two significantly improves the overall cleaning efficiency and thoroughness, and is especially suitable for working conditions with complex and potentially sticky dust in blast furnace flue gas.

[0025] 2. The airflow guiding mechanism in the jet cleaning system disperses the high-speed airflow through the top conical structure and guides the airflow to rotate and diffuse through the arc-shaped guide groove. This transforms the high-speed concentrated airflow entering the upper part of the filter bag frame into a uniform and turbulent flow field. This effectively avoids the problem of uneven dust removal between the upper and lower parts caused by the airflow directly hitting the bottom of the filter bag (especially the weak dust removal at the top), ensuring that the dust removal effect is consistent along the entire length of the filter bag and extending the overall service life of the filter bag.

[0026] 3. The horizontal reciprocating motion of the vibrating frame is achieved by adopting a "cam drive + spring reset" mechanism. The cam structure is simple and reliable. The vibration frequency can be easily controlled by adjusting the speed of the drive component. The energy storage and release process of the spring provides buffering, so that the vibration action has a certain elasticity rather than rigid impact. Combined with the elastic buffer pad set in the sleeve, the direct collision energy between metal parts is further absorbed. While ensuring the effective transmission of vibration force, the risk of mechanical damage to the filter bag frame and the filter bag itself is minimized, thereby improving the reliability of equipment operation and the service life of components. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 For the present invention Figure 1 Vertical sectional view of the structure;

[0029] Figure 3 This is a three-dimensional schematic diagram of the vibration frame structure of the present invention;

[0030] Figure 4 For the present invention Figure 1 Schematic diagram of the structural transverse section;

[0031] Figure 5 This is a three-dimensional schematic diagram of the fence frame structure of the present invention;

[0032] Figure 6 This is a three-dimensional schematic diagram of the flow guiding mechanism structure of the present invention;

[0033] Figure 7 This is a three-dimensional schematic diagram of the connector structure of the present invention.

[0034] In the diagram: 1. Box body; 11. Sliding sleeve; 2. Filter bag frame; 3. Vibration frame; 31. First sliding rod; 32. Sleeve; 33. Elastic buffer pad; 41. Connecting plate; 42. Second sliding rod; 43. Spring; 44. Driving component; 45. Cam; 46. Fence frame; 5. Blow pipe; 6. Nozzle; 7. Venturi tube; 81. Positioning rod; 82. Guide head; 83. Guide groove; 841. Connecting frame; 842. Clamping plate; 843. Groove; 844. Positioning plate; 845. Positioning post; 846. Positioning groove; 85. Nut. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] See attached document Figure 1-7 A dust removal device for a blast furnace flue gas treatment system includes a housing 1, a filter bag frame 2, a drive mechanism, and a vibrating frame 3.

[0037] The housing 1 has a filter bag frame 2 for installing filter bags inside. The filter bags are not shown in the figure. The filter bag frame 2 does not have a flexible metal skeleton. It is made of several flexible metal vertical rods arranged circumferentially. Several metal rings are evenly distributed in the vertical direction inside the circumferentially arranged metal vertical rods to support the filter bags and maintain their shape. The metal skeleton of the filter bag frame 2 can be made of one of low carbon steel, galvanized steel or stainless steel.

[0038] The vibrating frame 3 is horizontally installed inside the housing 1. It has a sleeve 32 that corresponds to and fits onto the lower part of the filter bag frame 2, so that the vibrating frame 3 can effectively transmit power to the lower part of the filter bag frame 2 during the operation. The vibrating frame 3 has a first sliding rod 31 symmetrically arranged on both sides. The housing 1 has a sliding sleeve 11 that slides with the first sliding rod 31 on both sides, so that the vibrating frame 3 can move horizontally back and forth inside the housing 1.

[0039] The drive mechanism is used to drive the vibrating frame 3 to perform horizontal reciprocating motion for vibrating and dust removal operations. It includes a connecting plate 41 located outside the housing 1, a second slide rod 42 connected to the connecting plate 41, and a power unit that drives the connecting plate 41 to move.

[0040] The end of the second slide rod 42 away from the connecting plate 41 extends into the corresponding slide sleeve 11. A through hole is provided on the side wall of the housing 1 corresponding to the slide sleeve 11. In order to prevent leakage at the connection between the slide sleeve 11 and the second slide rod 42, a flexible sealing element, such as a rubber sealing element, can be provided at the position where the slide sleeve 11 contacts the second slide rod 42. The end of the second slide rod 42 is connected to the end of the first slide rod 31 by a spring 43. The first slide rod 31 on the side of the vibrating frame 3 away from the second slide rod 42 is connected to the inner wall of the housing 1 by a spring 43. In its natural state, the spring 43 keeps the vibrating frame 3 in a balanced initial position.

[0041] The power unit is configured to drive the connecting plate 41 to move closer to the housing. When the power unit is activated, it pushes the connecting plate 41 and the second slide bar 42 to move towards the housing 1, compressing the spring 43 on its side, causing the vibrating frame 3 to shift as a whole and accumulate elastic potential energy. When the power unit is no longer driving the connecting plate 41, the vibrating frame 3 is reset by the spring 43. During continuous operation, the power unit can make the vibrating frame 3 reciprocate. This reciprocating motion will transmit power to the filter bag frame 2 and the filter bag on it through the sleeve 32, causing the dust layer attached to the surface of the filter bag to loosen and fall off, thus achieving the purpose of dust removal.

[0042] The sleeve 32 is embedded with an elastic buffer pad 33 in a circular structure. The elastic buffer pad 33 is made of wear-resistant elastic rubber material. Its inner diameter is slightly larger than the outer diameter of the corresponding part of the filter bag frame 2, so that there is a certain vibration gap between the elastic buffer pad 33 and the outer wall of the filter bag frame 2. This can ensure the effective transmission of vibration energy of the vibrating frame 3 and avoid rigid collision between the sleeve 32 and the filter bag frame 2, thus extending the service life of the component.

[0043] The power unit includes a drive unit 44 mounted on the outer wall of the housing 1 and a cam 45 located on the output shaft of the drive unit 44. The drive unit 44 is preferably a geared motor or a rotary cylinder. The connecting plate 41 is provided with a U-shaped fence frame 46 on the side facing the housing 1. The cam 45 is located in the space enclosed by the fence frame 46 and the connecting plate 41.

[0044] In the initial state, when the spring 43 is not compressed, the protrusion of the cam 45 maintains a certain gap with the inner wall of the fence frame 46 and the connecting plate 41. When the drive component 44 starts and drives the cam 45 to rotate, the protrusion of the cam 45 will periodically push the fence frame 46 and the connecting plate 41 towards the box 1, thereby compressing the spring 43. When the protrusion of the cam 45 passes the contact point, under the reset action of the spring 43, the connecting plate 41, the fence frame 46 and the vibrating frame 3 spring back to their original positions. By controlling the rotation speed of the drive component 44, the frequency of vibration can be adjusted. The drive of the cam 45 is simple, reliable and the impact force is controllable.

[0045] To optimize the dust removal effect, a pulse-jet cleaning system is installed inside the housing 1, which works in conjunction with mechanical vibration. The pulse-jet cleaning system includes several neatly arranged pulse-jet pipes 5. The pulse-jet pipes 5 are supplied with air from an external air source, such as a pulse valve. The bottom of each pulse-jet pipe 5 is equipped with a nozzle 6 corresponding to the filter bag frame 2 directly below it. Each filter bag frame 2 is equipped with a venturi tube 7 at the top. The small end of the venturi tube 7 faces upward to correspond to the nozzle 6, and the large end faces downward to correspond to the filter bag frame 2. When the pulse valve is opened, high-pressure gas is ejected from the nozzle 6, and after being guided by the venturi tube 7, it enters the interior of the filter bag, causing the filter bag to expand and shake instantly, thus achieving dust removal.

[0046] In order to further improve the jet cleaning effect and ensure the airflow distribution in the upper part of the filter bag frame 2, a flow guiding mechanism is provided inside the filter bag frame 2 to disturb the high-speed airflow entering the upper part of the filter bag frame 2.

[0047] Specifically, the flow guiding mechanism includes a positioning rod 81 vertically positioned at the center of the filter bag frame 2. The outer wall of the positioning rod 81 is provided with several flow guiding heads 82 spaced apart along its length. The top of each flow guiding head 82 is conical. When the high-speed airflow from the Venturi tube 7 impacts the top conical surface of the flow guiding head 82, it will be dispersed and its flow direction will be changed, thereby creating a disturbance in the upper part of the filter bag frame 2. This will cause the airflow to act more evenly on the entire inner surface of the filter bag, preventing the airflow from rushing straight to the bottom and causing uneven dust removal at the top of the filter bag frame 2.

[0048] Preferably, the bottom of the guide head 82 has a conical structure to reduce the resistance of the flue gas flow passing through the bottom.

[0049] Furthermore, in order to guide the airflow to diffuse more effectively, several guide grooves 83 are provided circumferentially on the outer peripheral wall of the guide head 82. The guide grooves 83 have an arc-shaped structure and penetrate the surface of the upper and lower conical structures of the guide head 82. Part of the airflow can pass along the guide grooves 83 to form a dispersed flow field, further enhancing the turbulence of the airflow and making the cleaning of the upper part of the filter bag more thorough.

[0050] The top of the positioning rod 81 is detachably connected to the upper spray pipe 5 via a connector, which facilitates the suspension, fixation and installation of the entire flow guiding mechanism.

[0051] The connector includes a connecting frame 841 connected to the top of the positioning rod 81. A pair of clamping plates 842 are symmetrically provided on the top of the connecting frame 841. Each clamping plate 842 is a U-shaped structure that is adapted to the arc of the outer wall of the blow pipe 5 and can hug the blow pipe 5 from both sides.

[0052] Each clamping plate 842 has a slot 843 at both free ends. A positioning plate 844 is rotatably connected to one of the slots 843 via a pin. The bottom of the positioning plate 844 has a positioning post 845. A positioning groove 846 that matches the positioning post 845 is provided on one side of the other slot 843. During installation, align the U-shaped openings of the two clamping plates 842 with the blowpipe 5 and close them so that the blowpipe 5 is inserted. Then rotate the two positioning plates 844 so that the positioning posts 845 at their ends are screwed into the corresponding positioning grooves 846. Due to the rotational pulling action of the positioning plates 844, the ends of the two clamping plates 842 move towards the center, thereby holding the blowpipe 5 tightly and achieving reliable fixation. During disassembly, simply rotate the positioning plates 844 in the opposite direction to loosen them.

[0053] The following method can be used to fix the guide head 82 on the positioning rod 81: the lower part of the positioning rod 81 is a screw rod, and each guide head 82 has a through hole in the center and is sleeved on the outer wall of the positioning rod 81. The lower outer wall of the positioning rod 81 is threaded with a pair of nuts 85. The pair of nuts 85 are respectively set on the upper and lower sides of the guide head 82. The position of the guide head 82 is locked by a pair of nuts 85, so that it is fixed at a set height. The installation position and number of guide heads 82 can also be flexibly adjusted by rotating the position of the nuts 85.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dust removal device for a blast furnace flue gas treatment system, comprising a housing (1) and a filter bag frame (2) disposed therein, characterized in that, It also includes a drive mechanism and a vibratory frame (3); The vibrating frame (3) is located inside the box (1), and there are sleeves (32) that correspond to each other and are fitted onto the lower part of the filter bag frame (2). The vibrating frame (3) has first sliding rods (31) symmetrically arranged on both sides. The box body (1) is provided with sliding sleeves (11) on both sides that slide in cooperation with the first sliding rod (31). The drive mechanism includes a connecting plate (41) located outside the housing (1), a second slide rod (42) connected to the connecting plate (41), and a power unit that drives the connecting plate (41) to move. The end of the second slide rod (42) away from the connecting plate (41) extends into the corresponding slide sleeve (11). The end of the second slide rod (42) is connected to the end of the first slide rod (31) by a spring (43). The first slide rod (31) on the side of the vibrating frame (3) away from the second slide rod (42) is connected to the inner wall of the box (1) by a spring (43). The power unit is configured to drive the connecting plate (41) to move toward the housing to compress the spring (43) and drive the vibrating frame (3) to reset under the reset of the spring (43); The power unit includes a drive unit (44) mounted on the outer wall of the housing (1) and a cam (45) provided on the output shaft of the drive unit (44). The connecting plate (41) is provided with a fence frame (46) on the side facing the housing (1), and the cam (45) is located inside the fence frame (46). In the initial state, there is a gap between the cam (45) and the inner wall of the fence frame (46) and the connecting plate (41). When the cam (45) rotates, its protrusion pushes the fence frame (46) and the connecting plate (41) to move closer to the box (1). The sleeve (32) is provided with an elastic buffer pad (33) in a circular structure, and a vibration gap is left between it and the outer wall of the corresponding filter bag frame (2); The housing (1) is equipped with a jet cleaning system, which includes several neatly arranged jet pipes (5). The bottom of each jet pipe (5) is provided with a nozzle (6) corresponding to the filter bag frame (2). Each filter bag frame (2) is provided with a venturi tube (7) at the top. Each venturi tube (7) is located below the corresponding nozzle (6). The filter bag frame (2) is provided with a flow guiding mechanism inside to disturb the airflow entering the upper part of the filter bag frame (2). The flow guiding mechanism includes a positioning rod (81) vertically positioned at the center of the filter bag frame (2). The outer wall of the positioning rod (81) is provided with a number of flow guiding heads (82) spaced apart along its length. The top of the flow guiding head (82) is conical and is used to disturb the airflow entering the upper part of the filter bag frame (2). The bottom of the guide head (82) is a conical structure to reduce the airflow resistance. The outer peripheral wall of the guide head (82) is provided with a plurality of guide grooves (83) along the circumferential direction. The guide grooves (83) are arc-shaped and penetrate the surfaces of the upper and lower conical structures of the guide head (82) for airflow to pass through. The top of the positioning rod (81) is detachably connected to the blow pipe (5) via a connector; The connector includes a connecting frame (841) connected to the top of the positioning rod (81). A pair of clamping plates (842) are symmetrically provided on the top of the connecting frame (841). The clamping plates (842) are U-shaped structures adapted to the outer wall of the blow pipe (5). Each of the card plates (842) has a slot (843) at both ends. A positioning plate (844) is rotatably connected in one of the slots (843). A positioning post (845) is provided at the bottom of the positioning plate (844). A positioning groove (846) that matches the positioning post (845) is provided on one side of the other slot (843). By rotating the positioning plate (844) so ​​that the positioning pin (845) is screwed into the positioning groove (846), the two ends of the clamping plate (842) can be brought closer to the center, thereby holding the blow pipe (5).

2. The dust removal device for a blast furnace flue gas treatment system as described in claim 1, characterized in that: The lower part of the positioning rod (81) is a lead screw. The center of the guide head (82) is provided with a through hole and is sleeved on the outer wall of the positioning rod (81). The lower outer wall of the positioning rod (81) is threaded with nuts (85). The paired nuts (85) are respectively located on the upper and lower sides of the guide head (82) to fix the guide head (82) at a set height.

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